WO2008035805A1 - Injection device for die casting machine - Google Patents

Abstract

A hybrid injection device for a die casting machine, in which a large electric power loss is prevented from occurring by avoiding a large current during pressurizing and holding operation and in which the size of a motor is reduced. The injection device has an injection cylinder (16) for receiving an injection piston (15) for injecting a molten metal into a mold and an electric booster (8) operating with a hydraulic cylinder. A head chamber (8H) of an electric booster is fluidically communicated with the head chamber (16H) of the injection cylinder. The head chamber (8H) linearly moves a booster piston rod (5) received in the electric booster (8) to push and move the injection piston, performing injection molding. Because a stop valve (25) is installed in a pipe interconnecting the head chamber (16H) of the injection cylinder and the rod chamber (8R) of the booster (8), the injection device can produce pressure by the head area of the electric booster during the boosting and produce pressure by the rod area thereof during pressurizing and holding operation.

Description

Die casting machine injection device Cross-reference for related applications

 The present invention relates to a Japanese patent application dated 20 September 2006, 20 00 06 — 2 5 4 0 0 2, 2 0 0 6 years 1 January 30, Japanese patent application dated 2 0 0 6 — 3 2 4 0 0 0, 2 0 0 May 3 0 Claimed on the basis of the priority of 2 0 0 7-1 4 3 3 4 7 , Incorporated herein by reference and continued in this application. Technical field

 The present invention relates to an injection apparatus such as a die casting machine, and more particularly to a hybrid type injection apparatus. Background art

 In die casting of aluminum alloys and the like, a hydraulic die force stamping machine that drives a jet piston (plunger) with a hydraulic cylinder has been used. In this type of die casting machine, the injection piston speed and pressure are controlled by adjusting the pressure and flow rate of hydraulic fluid supplied to the hydraulic cylinder that drives the injection piston.

In such die casting, it is important to stably maintain the injection piston (plunger) speed in order to improve the quality of the manufactured product, but the speed of the injection piston driven using a hydraulic cylinder is important. When controlling, the flow rate of hydraulic fluid supplied to the hydraulic cylinder is controlled by adjusting the hydraulic control valve, so the response is low and it is difficult to maintain a stable injection piston speed. In addition, when controlling the speed of an injection piston driven using a hydraulic cylinder, it is difficult to detect the load applied to the injection piston and it is difficult to perform feedback control. Difficult to maintain injection piston speed.

 In addition, when hydraulic pressure is used as the driving source for injection pistons, the energy efficiency is low, and the working environment deteriorates due to environmental pollution due to hydraulic oil leakage and the treatment of hydraulic fluid waste.

 Therefore, in order to improve the above points, an injection device has been proposed in which an injection piston (plunger) is connected in series with a pole screw mechanism that is driven by an electric servomotor and a hydraulic cylinder that is operated by the hydraulic pressure of the hydraulic pump and accumulator. (For example, see Patent Documents 1 to 3). This type of injection device for a die machine that combines hydraulic and electric drive is called a hybrid type (formula). The hybrid type injection device makes it possible to electrically control the injection piston speed and the like in an injection process that requires stable and precise control.

A hybrid injection device has been conceived as an injection device for a die casting machine. However, when this type is a type in which injection boosting and pressurization holding after boosting are carried out electrically, the maximum torque is maintained during pressurization holding. Therefore, there is a problem that a large current is required to flow in order to generate a large power loss and a problem that the size of the camera increases. The above problems occur at the time of pressurization and pressurization, and the details are described below. Figure 3 shows changes in injection speed (V) and cylinder head pressure (P _H ) of the injection piston (plunger) with respect to injection time (or injection stroke) in the operation (injection) process of the die casting machine (injection characteristics diagram and Call). Figure 3 shows how much injection piston drive power is required in the injection process. First, during pressurization (process), in order to reduce nests in the molded product, the pressurization time Δt shown in the injection characteristic diagram of Fig. 3 is required to have a performance of 10 msec or less. In the process of pushing AL into the unfilled part of the mold, the injection piston is generally moved forward by several mm to compress the hydraulic fluid in the hydraulic cylinder. To complete in 0 msec, it is necessary to supply a large amount of hydraulic oil (for example, a flow rate of about 500 L / in is required for a 500 t machine). In the case of an electric booth that performs the injection process electrically, the large-diameter booth evening (piston) rod must be advanced at a high speed, and at this time, the maximum rotation speed and torque are required. However, at the time of the next pressurization holding (step), it is necessary to maintain the pressure for the pressurization holding time TH (about 5 to 10 sec) corresponding to the solidification shrinkage of the molten metal AL (aluminum). This high torque is required, and a large current flows. Therefore, there is a possibility that problems such as power loss and motor trip occur.

 Moreover, in the conventional injection apparatus (refer patent documents 1-3), a control circuit and a control method must be complicated. In addition, this complication does not necessarily lead directly to increased injection piston (plunger) speed and stabilization.

In the above injection device, an electric servo motor is used to increase the controllability of the injection speed during high-speed injection, and a hydraulic cylinder is used to obtain a sufficiently large pressure increase / holding force during pressure increase / hold pressure. Use to drive the injection cylinder. In this drive mechanism, the thrust of the hydraulic cylinder is transmitted to the injection plunger through the pole screw shaft, so that the shaft diameter of the pole screw needs to be increased to some extent from the viewpoint of securing mechanical strength. However, this increase in diameter prevents the injection plunger speed from being increased and stabilized. In addition, while the injection plunger is moved forward by the electric support motor, it is necessary to supply the hydraulic oil to the hydraulic cylinder following the advance, but the hydraulic circuit for following the hydraulic oil supply is complicated. At the same time, control itself becomes difficult.

 Furthermore, when the injection pressure is increased and maintained with hydraulic pressure, the feedback control based on the rotation speed of the electric surpamo is canceled, and the torque in the direction to advance the injection plunger is always generated. It is necessary to control the evening control torque so that it does not become a reaction force against the hydraulic cylinder, and the overall circuit configuration including the hydraulic circuit must be complicated.

 After all, in the injection device (see Patent Documents 1 to 3), the control circuit and the control method must be complicated. Moreover, this complication does not necessarily directly lead to an increase in the speed and stabilization of the injection plunger speed. Therefore, in order to improve the above points, a ball screw mechanism that is driven by an electric thermocouple, a hydraulic pump, There has been proposed an injection device that drives an injection plunger by connecting hydraulic cylinders that are operated by the hydraulic pressure of the accumulator in parallel (see Patent Document 4).

 In the above injection device, the thrust of the hydraulic cylinder is transmitted directly to the injection plunger without going through the ball screw, so there is no need to increase the shaft diameter of the pole screw. In this respect, controllability is improved. Yes.

However, it is necessary to supply hydraulic oil to the hydraulic cylinder following the advance while the injection plunger is moved forward by the electric thermopmo, and when the injection pressure is increased and maintained with hydraulic pressure, The feedback control based on the rotation speed of the electric supporter is released, and the torque in the direction to move the injection plunger forward is generated at all times. It is necessary to control the control torque so that it does not become a reaction force against the hydraulic cylinder, as in the case of the injection device disclosed in Patent Documents 1 to 3. As a result, the control circuit and control method are complicated. I have to be. Further, since the injection device described in Patent Document 4 includes a hydraulic tank and a hydraulic pump, the scale of the device is increased, the maintainability is deteriorated, and the working environment is deteriorated.

 By the way, in recent years, in die casting, it is required to manufacture a forged product having a complicated shape at high speed and high quality with a high yield. One way to respond to this is to use a large and large output motor to drive the injection plunger.

 However, large motors generally have poor responsiveness, and the timing for switching the injection plunger from low speed to high speed is delayed, making it difficult to maintain the quality of the fabricated product.

 In addition, when using a large motor for a die casting machine of 3500 tons, for example, a large motor of 50 OK w is required for instantaneous output, and a large pitch is required to increase the speed of the injection plunger. Screw feed mechanism (for example, to obtain a high speed of 5 m / s at 200 rpm, a screw with a pitch of 150 mm is required, and a screw with a pitch of 90 mm is required even at 3 m / s ) Is required.

 After all, the drive device that drives the injection plunger using a large and large output motor has to be large-scale and large-capacity, its controllability is reduced, and a large-scale and large-capacity drive device is reduced. If it is used, the inertial mass of the forged product will increase, and burrs will easily occur in the forged product, making it difficult to maintain the quality of the forged product.

In the current situation where die-cast forged products with complex shapes are required to be manufactured at high speed, high quality, and high yield, a simple drive mechanism with excellent controllability and excellent maintainability And small size and light weight saving There is a need for energy-type high-speed injection devices.

 In view of the above request, the applicant of the present invention disclosed in Patent Document 5 that the hydraulic control mechanism connected with the plunger is provided with an advance / retreat control mechanism that drives the hydraulic control mechanism in the advance / retreat direction of the plunger. We have proposed a hybrid injection device that excels in performance.

 According to the hybrid injection device proposed in Patent Document 5, the injection device itself can be reduced in size and weight as compared with the conventional device, and at the same time, switching and pressure increase at the low-speed and high-speed switching positions can be achieved. Because it can be controlled with high precision, it can produce high quality forged products with good yield, but there are limits to miniaturization and weight reduction.

 In FIG. 1, although not shown, a logic valve is actually provided at the outlet of the accumulator (A C C). The reason for this will be described below. In the die-casting machine, it is necessary to supply the pressure oil to the accumulator (AC C) to the specified pressure before performing the injection operation. The pressure oil supply time to the ACC by the pump is, for example, 8 sec is required for the mold clamping machine. The following explains when the hydraulic oil is supplied to A C C with reference to Fig. 9. In Fig. 9, the schematic steps before the start of injection are shown, and the required time for each process is shown in parentheses.

In the product removal procedure (S 1), the product molded in the previous process is removed. In the spraying procedure (S2), spray the release agent on the inner surface of the mold. In the core insertion procedure (S 3), move the mold according to the product shape as necessary. In the mold clamping procedure (S4), the fixed and movable molds are engaged. In the hot water supply procedure (P 5), supply the molten metal to the sleeve. Thereafter, in the injection procedure (S 6), the molten metal is injected into the mold cavity and molded. The time required for each procedure is 8 sec (SI), 9 sec (S 2), 2 sec (S 3), 5 sec (S 4), and 3 sec (S 5).

 Here, pumps are used in the core insertion procedure (S 3) and mold clamping procedure (S 4), so pressure oil cannot be supplied to A C C. The hot water supply operation time just before injection is only 3 sec, which is not enough in time. Therefore, the AC C charge is performed by the product removal procedure (S 1) or the spray procedure (S 2). The problem that occurs in this case is that it takes 10 sec to reach the injection procedure (in the shortest time), assuming that the ACC charge ends at the end of the spray procedure (S 2). This is the shortest time for fully automatic operation, but if an operator's auxiliary operation is required (semi-automatic operation), it will require 5 to 10 seconds after spraying. In this case, 15 to 20 sec. During this time, the A C C pressure oil causes a pressure drop due to valve leakage on the circuit, and the pressure during actual use fluctuates (decreases).

This pressure fluctuation causes a rise in speed and a fluctuation (decrease) in the maximum value in the injection accumulator (ACC), and a fluctuation in the pressure rise time and fluctuation in the pressure rise in the pressure accumulation accumulator (ACC). It directly affects the quality variation of die cast products. To prevent this, a logic valve, the least leaking valve, is installed at the outlet of the ACC, which is the injection logic valve 7 1 and boosting logic valve 7 3 in the conventional circuit shown in Fig. 10. In addition, an injection logic opening / closing valve 70 and a boosting logic opening / closing valve 72 are required. By providing these valves, the pressure drop that falls below the allowable value from 8 to 10 seconds is longer from 40 to 60 seconds, which solves the above problems and It is no exaggeration to say that this method is used in all die casting machines. On the other hand, with the latest die casting machines, the maximum injection speed is

For 5 mZ s e c, a doubling of 10 m / s e c is required. In addition, the high-speed rise time is 0.5 to 5 m / s e c, and the conventional machine, which was 20 m sec, is required to be reduced to 5 ms and 1 Z 4. In this case, it is necessary to minimize the pipe resistance from the injection A C C to the injection cylinder. Therefore, the logic valves 7 1 and 7 3 are burdened heavily. Such a problem exists in connection with logic valves.

In addition, other injection devices have been proposed (see, for example, Patent Documents 4 and 5). However, the size of the device is large, and maintenance and work environment are insufficient. There is a limit to downsizing and weight reduction. There was room for improvement. Another conventional plan (see Patent Document 6) is a standard hydraulic circuit. In this conventional plan, the cartridge valves 2 2 and 2 8 which are logic valves are provided. It is a deletion target of the present invention. The conventional example in FIG. 10 is a hydraulic circuit based on the conventional proposal of Patent Document 6, which is not a hybrid type but a hydraulic type conventional injection device, and a low pressure accumulator (piston accumulator for injection 30). ) And a high-pressure accumulator (pressure-up piston accumulator 3 2). In the conventional example of FIG. 10, an injection logic valve 7 1, an injection logic open / close valve 70, a boost logic valve 7 3, and a boost logic open / close valve 7 2 are provided. As described above, these logic valves function to prevent leakage of hydraulic pressure from the piston accumulators 3 1 and 3 3. Since the description of the conventional hydraulic circuit shown in FIG. 10 overlaps with the detailed description in the embodiment of the present invention, the description of the unnecessary part is omitted and the description is simplified. Further, in the conventional example of FIG. 10, the implementation of the present invention shown in FIG. 7 and FIGS. Elements of FIG. 10 that are the same as or similar to elements of the form are designated by the same reference numerals.

 In FIG. 10, reference numbers 3 2 and 3 4 are an injection gas bottle and a pressurization gas bottle, respectively. Reference numbers 7 7, 7 8, 7 9 are check valves. Reference numerals 1 8 and 1 9 are electromagnetic switching valves and are provided in the pump supply line 3 6. Reference numeral 75 is an electromagnetic three-way switching valve, which is provided upstream of the valve M 24. Reference number 76 is an electromagnetic three-way switching valve, which is provided on the line that communicates with the injection cylinder rod chamber.

 [Patent Document 1] Japanese Patent Laid-Open No. 2 0 0 0-0 3 3 4 7 2

 [Patent Document 2] Japanese Patent Laid-Open No. 2 0 0 0 1 0 8 4 6 5 4

 [Patent Document 3] Japanese Patent Laid-Open No. 2 0 0 1 1 0 0 1 1 2 6

 [Patent Document 4] Japanese Patent Laid-Open No. 2 0 0 6 1 0 0 0 8 8 7

 [Patent Document 5] Japanese Patent Application No. 2 0 0 6 1 1 1 5 8 5 9

 [Patent Document 6] Japanese Patent Application Laid-Open No. 8-1 1 7 9 6 2 Disclosure of Invention

 The present invention has been made in view of the circumstances described above, and in the case of a type in which the pressurization holding after injection boosting and boosting is performed electrically, avoiding the necessity of flowing a large current during pressurization holding, An object of the present invention is to provide a die-cast machine injection device, in particular a hybrid injection device, which can prevent a large power loss and reduce the size of the machine.

Another object of the present invention is that, in a hybrid injection device of a die cast machine, the logic valve at the outlet of the accumulator is deleted, and the flow resistance is greatly reduced, thereby improving the injection speed. Providing a hybrid injection device that can achieve injection performance Is Rukoto. Furthermore, the cost of the injection device is reduced.

 In the conventional injection device that controls the injection plunger with the electric mechanism and hydraulic mechanism, one of the factors that hinders further reduction in size, weight, and speed is directly driven by the electric mechanism. It is to adopt the advance / retreat structure. That is, when the injection mechanism is moved back and forth with an electric mechanism, it must be moved back and forth including the hydraulic mechanism that drives the injection plunger, so there is a limit to reducing the size and weight of the electric mechanism.

 An object of the present invention is to provide a high-speed injection device that drives a plunger with a simple drive mechanism and is small, light, excellent in controllability, and excellent in maintainability.

 An injection device (10) for a die casting machine according to a first embodiment of the present invention is an injection piston (1) for injecting a molten metal such as aluminum into a die of a die casting machine in order to achieve the above-described object. 5) and an injection cylinder (16) for accommodating a hydraulic cylinder type electric booth (8). In the injection device, the head chamber (8H) of the electric booster (8) is in fluid communication with the head chamber (16H) of the injection cylinder (16), so that the electric booster (8) The piston rod (5) accommodated in the booth is moved linearly to supply pressure oil to the head chamber (16 H) of the injection cylinder (16) to bring the injection piston (15) Injection molding is performed by pressing and moving. In the injection molding process, the electric booth (8) has a structure in which the pressure is increased with the head area of the electric booster (8) when the pressure is increased, and the pressure is increased with the load area when the pressure is maintained.

More specifically, there are connecting pipes (41, 43, 44, 45) that fluidly connect the head chamber (16H) of the injection cylinder and the rod chamber (8R) of the booster (8). It is provided, and the flow of hydraulic oil is interrupted in the connecting pipe A stop valve (25) is provided.

 The electric booster (8) is preferably driven by an electric motor (1), and the electric motor (1) is more preferably a support motor, and the injection device (10) is an injection cylinder Piston accumulator for injection (3 1) for supplying pressure oil to the head chamber (16 H), and piping for fluid communication from the boot chamber (8 R) to the tank (3 5) (4 3) and a stop valve (2 6), and the rod chamber (1 6 R) of the injection cylinder (16) is supplied with pressure from the tank (3 5) and the pump. It is preferable to make fluid communication with the oil supply port (36).

 The injection device further includes a pressure detection sensor (37) for detecting the head pressure, which is the pressure in the head chamber (16 H) of the injection cylinder (16), in the electric booth (8). In this way, the head pressure is detected, the torque of the electric motor (1) is controlled, and the switching control from the boosting operation to the pressurization holding operation is performed.

An injection device (1 0 0) for a die casting machine according to a second embodiment of the present invention includes an injection cylinder (1 6) that houses an injection piston (1 5) for injecting a molten metal such as aluminum into a die of the die casting machine. ) And pressure oil is supplied to the head chamber (16 H) of the injection cylinder (16) and the injection piston (15) is pressed and moved to perform a booth for performing injection molding. A hydraulic cylinder type electric booster (8) that houses the piston rod (5) in the evening and a head of the injection cylinder (16) that can store a predetermined amount of hydraulic oil at a predetermined maximum pressure. A piston accumulator (3 1) formed so as to be able to press and move the injection piston (15) by supplying pressurized oil to the chamber (16 H), and comprising an electric booster (8 ) A Stone accumulator (3 1) and a first switching valve (2 4) provided on the outlet side of the piston accumulator (3 1) and capable of opening and closing the flow path of the pressure oil from the outlet. It has. In the injection device (1 0 0), pressure oil is supplied to the piston accumulator (3 1) just before the start of injection to prevent leakage of the pressure oil from the first switching valve (2 4). Therefore, it is possible to delete a logic valve that should be provided at the outlet of the piston accumulator (3 1). Specifically, the hot water supply process was performed immediately before the start of injection, and the supply of pressure oil to the piston accumulator (31) was completed during the hot water supply process.

 More specifically, the head chamber (8H) of the electric booster (8) is in fluid communication with the head chamber (16H) of the ejection cylinder (16) and the piston accumulator (31). The second switching valve (25) is provided in the flow path that fluidly connects the electric bush head chamber (8H) and the injection cylinder head chamber (16H). The second switching valve (25) is provided on one side of the flow path connection side with a flow path communicating with the electric booth evening head chamber (8H) and a tank for storing hydraulic oil. (35) fluidly connected to the flow path communicating with the flow path, and on the other flow path connection side, the flow path communicating with the head chamber (16 H) of the injection cylinder (16) and the piston accumulator (3 1) Fluid connection to the flow path communicating with.

Pressure oil is supplied to the piston accumulator (3 1) by an electric booth (8), and the pressure oil in the head chamber (8H) of the electric booster (8) is pressed and supplied. Furthermore, after the injection operation is completed, in order to return the injection piston (15) to the head side end of the injection cylinder (16), the electric booth (8) is driven to apply pressure oil. It is preferable to supply to the rod chamber (16 R) of the ejection cylinder (16). Yes.

 More specifically, the injection device includes a third switching valve (6) provided in a flow path for fluid communication between the electric booth evening chamber chamber (8R) and the injection cylinder head chamber (16H). 2) is further provided. The first switching valve (2 4) is connected to the flow path communicating with the piston accumulator (3 1) and the tank (3 5) storing hydraulic oil on one flow path connection side. The fluid passage is connected to the fluid passage, and on the other fluid passage connection side, the fluid passage connected to the head chamber (16H) of the injection cylinder (16) and the rod chamber of the ejection cylinder (16) (3 6 R) is fluidly connected to the flow path communicating with the flow path, and the third switching valve (6 2) is connected to the flow path communicating with the tank (3 5) on one flow path connection side. , Fluid connection to the flow passage connecting to the injection electric booth evening lock chamber (8R), and to the head chamber (16H) of the injection cylinder (16) on the other flow passage connection side And a fluid channel connected to the rod chamber (16 R) of the injection cylinder (16).

 The present inventor has intensively studied a compact and lightweight high-speed injection structure (hybrid high-speed injection mechanism) that can produce a complex-shaped forged product with a high quality and a high yield by using both an electric mechanism and a hydraulic mechanism. .

 As a result, the present inventor provided a piston rod that is advanced and retracted by an electric mechanism in the hydraulic cylinder behind the piston rod to which the plunger is connected, and the two piston rods are driven individually or integrally as appropriate. For example, we have found that it is possible to accurately control the forward / backward movement of the plunger at high speed, and to manufacture a complex shaped product with high quality and high yield.

 The present invention has been made on the basis of the above findings, and the gist thereof is as follows.

(1) Drive the plunger to fill the mold cavity with molten metal Hybrid high-speed injection with excellent controllability, characterized in that a piston port controlled by the advance / retreat control mechanism is provided behind the hydraulic cylinder that contains the plunger rod controlled by the hydraulic control mechanism. apparatus.

 (2) The hybrid high-speed injection device excellent in controllability according to (1), wherein the advance / retreat control mechanism is a pole screw mechanism.

(3) The hybrid high-speed injection device excellent in controllability as described in (2) above, characterized in that the pole screw mechanism is driven by a servomotor.

 (4) A piston rod controlled by the advance / retreat control mechanism is installed behind the hydraulic cylinder containing the plunger rod controlled by the hydraulic control mechanism, and the hydraulic control mechanism and the advance / retreat control mechanism are driven in cooperation. In a control method for controlling filling of molten metal mold cavity,

 (i) Drive the advance / retreat control mechanism to integrate the plunger rod with the piston rod until it reaches the low speed / high speed switching position.

 (i i) A Λ hybrid high-speed injection control method characterized in that the hydraulic control mechanism is driven and the plunger is advanced at high speed in cooperation with the advance / retreat control mechanism.

 (5) The hybrid high-speed injection control method according to (4), characterized in that the hydraulic control mechanism is driven in real-time feedback control according to a rising curve up to a preset injection pressure. The invention's effect

According to the present invention, in a hydraulic circuit of a hybrid type injection device of a die machine that performs injection boosting and pressurization holding after boosting electrically. At the time of pressurization, for example, by providing a switching valve that can communicate the pressure of the injection cylinder head chamber to the booth rod chamber, the booster piston rod drive is driven. By reducing the required maximum torque, it is possible to avoid the need for a large current to flow during pressurization and to prevent a large power loss and to reduce the motor size. As a result, the size of the injection device itself can be reduced, and the manufacturing cost of the injection device can be reduced.

 In addition, by further providing a pressure detection sensor (37) for detecting the head pressure, which is the pressure in the head chamber (16H) of the injection cylinder (16), the head pressure is detected. Since the torque of the electric motor (1) can be controlled so that the head pressure becomes a predetermined value, stable and accurate injection molding becomes possible. Furthermore, by performing switching control from the pressure increasing operation to the pressure holding operation based on the head pressure, it is possible to prevent inappropriate operation such as an excessive increase in injection pressure.

 Furthermore, according to the second mode, the logic valve at the outlet of the accumulator (ACC) provided to prevent the leakage of pressure oil from the piston accumulator can be eliminated, the pipe resistance can be greatly reduced, and the required injection Achievement of performance becomes easy and cost reduction can be implemented.

 According to the present invention, the injection device itself can be further reduced in size and weight as compared with the conventional device, and at the same time, switching and pressure increase at a low speed / high speed switching position can be controlled with high responsiveness and high accuracy. Therefore, according to the present invention, a high-quality forged product can be manufactured with a high yield. In addition, the present invention is remarkably excellent in maintainability as it is further reduced in size and weight.

In the above description of the present invention, symbols or numbers in parentheses () are attached to show correspondence with the embodiments shown below. The present invention may be more fully understood from the following description of preferred embodiments of the present invention, with reference to the accompanying drawings. Brief Description of Drawings

 FIG. 1 is an explanatory diagram showing a schematic configuration of a hydraulic circuit according to an embodiment of an injection device for a die casting machine according to the present invention.

 Fig. 2a is an explanatory diagram showing the state of the hydraulic circuit in various work processes in the die casting machine, showing the circuit during low-speed injection.

 Fig. 2b is an explanatory diagram showing the state of the hydraulic circuit in various work processes in the die casting machine, showing the circuit during high-speed injection.

 Fig. 2 ci is an explanatory diagram showing the state of the hydraulic circuit in various work processes in the die casting machine, and shows the circuit during boosting.

 FIG. 2d is an explanatory diagram showing the state of the hydraulic circuit in various work processes in the die casting machine, and shows the circuit during pressure holding.

 Fig. 2e is an explanatory diagram showing the state of the hydraulic circuit in various work processes in the die casting machine, and shows the circuit during ejection.

 Fig. 2f is an explanatory diagram showing the state of the hydraulic circuit in various work processes in the die-casting machine, and shows the circuit during reverse operation.

 Fig. 3 is a graph (injection characteristics diagram) showing the change in injection speed and cylinder head pressure of the injection piston with respect to the injection time (or injection stroke) in the operation process of the die casting machine.

 Fig. 4 is a graph in which each process (region) during pressurization and pressurization holding is clearly written on the graph of Fig. 3.

 Fig. 5 is an explanatory diagram of the difference between the hydraulic circuit in the boosting step (booster circuit during boosting) in Fig. 2c and the hydraulic circuit (pressurizing and holding circuit) in the pressurizing and holding step in Fig. 2d. The booster circuit is shown.

Fig. 6 shows the hydraulic circuit in the boosting process of Fig. 2c (booster circuit during boosting) FIG. 2d is an explanatory diagram of the difference between the hydraulic circuit (pressure holding circuit) in the pressure holding process of FIG. 2d and shows the booster circuit at the time of pressure holding.

 FIG. 7 is an explanatory diagram showing a schematic configuration of a hydraulic circuit of the second embodiment of the die casting machine injection device according to the present invention.

 FIG. 8a is an explanatory view showing the state of the hydraulic circuit of FIG. 7 in various work processes in the die casting machine, and shows the circuit when charging (charging) the accumulator.

Fig. 8b is an explanatory diagram showing the state of the hydraulic circuit of Fig. 7 in various work processes in the die-casting machine, and Fig. 8c shows the circuit during low-speed injection in Fig. 7 in various work processes in the die-casting machine. FIG. 8 d is a diagram illustrating the state of the hydraulic circuit, and FIG. 8 d is a diagram illustrating the circuit during high-speed injection. FIG. 8 d is a diagram illustrating the state of the hydraulic circuit of FIG. 7 in various work processes in the die casting machine. Show. Fig. 8e is an explanatory diagram showing the state of the hydraulic circuit of Fig. 7 in various work processes in the die-casting machine. Fig. 8f shows the circuit during pressurization holding. Fig. 8f is a diagram of various work processes in the die-cast machine. FIG. 8g is a diagram illustrating the state of the hydraulic circuit of FIG. 7, and FIG. 8g is a diagram illustrating the state of the hydraulic circuit of FIG. 7 in various work processes in the die casting machine. Show. Fig. 9 is an explanatory diagram showing the flow of the process before the start of injection in general injection molding. The time required for each process is shown at the same time. Figure 10 shows the conventional hydraulic die casting machine. Hydraulics for injection equipment It is explanatory drawing which shows schematic structure of a circuit.

 Figure 11 shows a table comparing the accumulator charge time and the shortest hot water supply time for an actual actual machine (clamping force from 3 75 t to 40 00 t machine).

 FIG. 12 is a diagram showing one structure of the hybrid high-speed injection device of the present invention.

 FIG. 13 is a diagram showing a mode immediately before the start of injection in the invention. FIG. 14 is a diagram showing a state immediately before the plunger reaches the low speed-high speed switching position S in the present invention.

 FIG. 15 is a view showing a state in which the plunger rod advances at a high speed in the present invention.

 FIG. 16 is a view showing an aspect when the filling of the molten metal is completed and the forward movement of the plunger rod is almost stopped in the present invention.

 FIG. 17 is a diagram showing an aspect when injection is completed and the forward movement of the plunger rod is completely stopped in the present invention.

 FIG. 18 is a view showing a state in which the piston rod and the plunger rod are integrated and advanced in order to discharge the solidified substance remaining in the injection sleeve in the present invention.

 FIG. 19 is a view showing a mode in which the plunger rod and the piston rod are retracted in preparation for the next injection in the present invention.

 FIG. 20 is a diagram showing the rise of the injection pressure in the present invention. FIG. 21 is a diagram showing another structure of the hybrid high-speed injection device of the present invention.

 FIG. 22 is a diagram showing a mode immediately before the start of injection in the present invention. FIG. 23 is a diagram showing another mode immediately before the plunger reaches the low speed / high speed switching position S in the present invention.

Fig. 24 shows that the plunger rod moves forward at high speed in the present invention. It is a figure which shows another aspect.

 FIG. 25 is a diagram showing another aspect when the molten metal filling is completed and the forward movement of the plunger rod is almost stopped in the present invention.

 FIG. 26 is a view showing another aspect of the present invention when the injection is completed and the forward movement of the plunger rod is completely stopped.

 FIG. 27 is a view showing another embodiment in which the piston rod and the plunger rod are integrated and advanced in order to discharge the coagulum remaining in the injection sleeve in the present invention.

 FIG. 28 is a view showing another mode in which the plunger rod and the piston port are moved backward in preparation for the next injection in the present invention. FIG. 29 is a diagram showing another increase in the injection pressure according to the present invention. DESCRIPTION OF PREFERRED EMBODIMENTS FOR CARRYING OUT THE INVENTION

 Hereinafter, based on embodiments, an injection device for a die casting machine of the present invention will be described in detail with reference to the drawings. 1 and 2a to 2f show a first embodiment of an injection device for a die casting machine according to the present invention, and FIG. 1 shows a hydraulic pressure of the first embodiment of the injection device for a die casting machine. FIG. 2a to FIG. 2f are explanatory diagrams showing states of the hydraulic circuit in various work processes in the die casting machine of FIG.

 The injection device 10 according to the present embodiment is a hybrid type, and the injection piston (plunger) 15 is actuated by driving the booth evening piston rod 5 by the thermopo 1 and the mold is made of aluminum (AL ) Inject molten metal.

In the hydraulic circuit of the injection device 10 according to the present embodiment, the thermoplum 1 is provided as an electric drive unit. It is connected to the drive gear 2 and driven to rotate. The drive gear 2 meshes with the pole nut gear 3 whose outer side is a gear and whose inner side is threaded, and the pole nut 卜 gear 3 is a pole screw shaft whose outer surface is threaded. The pole screw shaft 4 passes through the opening passing through the center of the pole nut gear 3. The upper end portion of the ball screw shaft 4 is connected to one end portion of the top plate 7, and the other end portion of the top plate 7 is connected to the upper end portion of the booth piston rod 5. With such a configuration, the pole screw shaft 4 reciprocates linearly in the vertical direction and the booster piston rod 5 reciprocates linearly in the vertical direction by the rotation of the support motor 1.

 Booster piston piston 5 is provided at the lower end of booster piston rod 5, and booster piston piston 5 reciprocates in cylinder-shaped bush evening 8 by the vertical movement of booster piston rod 5. Booth evening (cylinder) The hydraulic fluid in 8 is pumped and sucked. As shown in FIG. 1, the front end of the booth evening head chamber 8 H side of the booster 8 is in fluid communication with the injection cylinder head chamber 16 H of the injection cylinder 16. In the present embodiment, as shown in FIG. 1, the injection cylinder 16 is installed horizontally, while the booth evening 8 is installed vertically so as to be orthogonal thereto. Is called vertical type. The injection device 10 according to the present embodiment is described in a vertical configuration. However, the injection device according to the present invention is connected to the injection cylinder 16 in parallel with the booster 8 installed horizontally. Yes, it may be horizontal.

An injection piston 15 is accommodated in the injection cylinder 16, and a plunger tip (not shown) is attached to the left end of the injection piston 15. Housed in a plunger sleeve (not shown) that penetrates into the stationary mold of the machine, the plunger sleeve is in fluid communication with the mold. The injection apparatus 10 according to the present embodiment includes an injection piston accumulator (A CC) 3 1 and gas bottle 3 2 for driving it under pressure, valve A 2 1, valve B 2 2, nozzle C 2 3, valve M 2 4, and for storing hydraulic oil 3 and 5 tanks.

 In the present embodiment, the injection device 10 has its hydraulic circuit in its hydraulic circuit, as shown in FIG. 1, the head chamber 16 H of the injection cylinder 16 and the rod chamber 8 R of the cylinder-like booster 8 and the tank 3. Pressure detection provided on the end face of the booster 8 on the head chamber side of the valve D 2 5 and valve E 2 6 provided on the piping lines 4 5, 4 4 and 4 3 Sensor 3 7.

Next, the operation of the injection device in the present embodiment will be described. Figure 2a shows the state of the hydraulic circuit during low speed injection. During low-speed injection in Fig. 2a, booster piston head 5 is driven downward (forward) by servo motor 1, and the hydraulic oil in booth evening head 8H is pushed at low speed, and injection cylinder chamber 1 6 H Then, the injection piston 15 in the injection cylinder 16 is pushed to the left (toward the plunger sleeve in which the molten AL is stored). At this time, the booth evening piston rod 5 of the present embodiment has a small diameter, so that an opening chamber 8 R of the booster 8 is formed, and the booster rod chamber 8 R is as shown in FIG. The piping lines 4 4 and 4 3 are connected to the tank 3 5 through the valve E 2 6 for fluid communication. Therefore, when the booster piston rod 5 is lowered, the valve E 26 is opened, so that the hydraulic oil is supplied from the tank 35 to the booster rod chamber 8 R via the lines 4 3 and 4 4 and the valve E 2 6. Flows in. At this time, the tank 35 may be installed at a position higher than the booth evening load chamber 8 R, and the hydraulic oil may flow into the booster rod chamber 8 R due to gravity, but the hydraulic oil may be blocked by another means such as a pump. —It may be supplied to the 8 R room. A plunger tip (not shown) is attached to the left end of the injection piston 15 and The nanger chip is housed in a plunger sleeve (not shown) that penetrates into the die of the die casting machine.

(A L) Press the molten metal to fill the cavity in the mold (not shown). During low-speed injection, valve B 2 2 is open and valve C 2 3 is closed. As the injection piston 15 moves to the left, the hydraulic oil in the injection cylinder rod chamber 16 R Flows through line 4 2 and open valve B 2 2 to tank 3 5. Again, this low-speed injection corresponds to the time t 0 to t 1 in FIGS. 3 and 4 (the figure explaining the low-speed injection region etc. in FIG. 3). By controlling the rotation of the servo motor 1 during low-speed injection, shockless control, low-speed injection speed multi-stage control, and real-time speed control can be performed.

 Figure 2b shows the hydraulic circuit during high speed injection. At the time of high-speed injection shown in Fig. 2b, while the booster piston rod 5 continues to be lowered (advanced) (further from the state shown in Fig. 2a), the valve accumulator for injection ( ACC) 3 1 Pressure oil is introduced into the head chamber 16H of the injection cylinder 16 via the piping line 41, and a large flow rate of hydraulic fluid is introduced from the two power sources. Drive 1 5 at high speed. At this time, valve E 2 6 is open and valve D 2 5 is closed and valve B 2 2 is open and valve C 2 3 is still closed, and valve A 2 1 is also closed. Here, by controlling the opening degree of the valve M 24, the high-speed injection is completed while controlling the high-speed speed (the booster piston rod 5 keeps moving forward during this time). This high-speed injection corresponds to time 1; 1 to t 2 in Figs.

Figure 2c shows the hydraulic circuit during boosting. During the pressure increase in Fig. 2c, the valve M 24 is closed from the state of Fig. 2b, and the piston accumulator for injection Murray evening (ACC) 3 With the hydraulic pressure from 1 cut off, the booth evening piston rod 5 is further advanced (lowered) to increase the pressure in the injection cylinder head chamber 16 H. At this time, valve E 2 6 is open, valve D 2 5 is closed, and valve B 2 2 is open, valve C 2 3 is still closed, and valve A 2 1 is also closed. This pressure increase corresponds to the time from t2 to t3 in Figs. 3 and 4, and the molten AL in the mold cavity is boosted.

 Then, the pressure applied by the booster 8 is measured by the pressure detection sensor 37, and when the pressure reaches the target 80 to 90%, the hydraulic circuit for maintaining the pressure shown in Fig. 2d is switched. In the hydraulic circuit during pressurization holding in Fig. 2d, while booth evening biston rod 5 is moved forward (lowered) by thermopow 1, valve E 26 is closed and valve D 25 is switched to open. As a result, the pressure of the hydraulic oil pushed by the booth piston 6 is transmitted to the rod chamber 8 R of the booster 8, so that the force that should be exerted by the supporter 1 is The force that is the product of the area corresponding to the diameter of and the pressure, can exert the same force as the force for pressing the injection piston 15 of the conventional example. In this process, the valve B 2 2 is opened and the valve C 2 3 is kept closed, and the valve A 2 1 and the valve M 2 4 are also closed. This pressure holding time corresponds to the time t 3 to t 4 in FIGS.

After that, the ejecting process shown in Fig. 2e is carried out. 'In this process, the servo motor 1 moves the booth evening piston rod 5 forward (lowers) to move the injection piston 15 to the left. By pressing, the mold is opened and the die-cast product can be taken out. Furthermore, the injection return process of FIG. 2 f is performed, and hydraulic oil is supplied from the pump supply port 36 to the injection cylinder rod chamber 16 R via the line 42, and the injection piston 15 is Move to the head side (right direction) in the injection cylinder 16 At the same time, Booster Piston Rod 5 is driven up by the Serpomo. The hydraulic oil in the injection cylinder head chamber 16 H and the booster chamber 8 R is returned to the tank 35 by opening the valve A 21 and valve E 26 together. In the ejecting process shown in Fig. 2e, valve E 2 6 is open and valve D 2 5 is closed, and valve B 2 2 is open and valve C 2 3 is closed, and valves A 2 1 and Valve M 2 4 is also closed. In the injection return process shown in Fig. 2f, valve E 2 6 is open, valve D 2 5 is closed and valve B 2 2 is closed, valve C 2 3 is set to open, valve A 2 1 is open, and valve A 2 1 is open. M 2 4 is closed.

The difference between the hydraulic circuit in the boosting process in Fig. 2c (booster circuit during boosting) and the hydraulic circuit in the pressurizing and holding process (pressurizing and holding circuit) in Fig. 2d (ie, in Fig. 2c and 2d, Fig. 5 and Fig. 6 show the difference when E 2 6 is switched from open to closed and knob D 2 5 is switched from closed to open. Pressurize the pressure oil with the booster piston area A _BH in order to shorten the time during pressurization. Necessary booth evening power F 1 at this time

F 1 = A _B HXP _H 'Torque T 1 generated by the motor at that time is

 Τ 1 = C X F 1

1 XA g _Insert 1 I

When maintaining pressure, the head room and the lodge room at the booth evening should be at the same pressure. The required torque Τ 2 is

F 2 = A _BR XPH

T 2 = CXA _BR XPH

If the head area A _BR is set to 1 to 3 of the head area A _BH , the required torque decreases at the same rate, and the motor current value that is proportional to the torque also decreases at the same rate. Solve problems such as Moyu trip Is done. In this case note that while maintaining the torque T 1, switching the circuits, the problem of the pressure P _H is applied pressure by a height no longer injection cylinder ratio of rod de area and heads area is increased over one appear

. Therefore, since P _H rises as the pressure in the rod-de chamber is transmitted

It is necessary to detect this pressure with a pressure sensor, detect that the target value is the same or several percent UP, and perform automatic control to gradually reduce the torque.

In the present embodiment, a force for performing the same process as the above-described conventional example until the boosting step is incorporated, and a method of switching the circuit and changing the pressurizing area of the booth evening is incorporated in the pressurizing and holding step. At the time of pressurization and holding, the piston hardly moves, and it should be noted that the oil amount of 10 to 20 L / min should be sent, and the necessary torque T generated by the motor is the area of the booth evening pressurization A _B Is proportional to the product of the head pressure P _H and the area A _B is changed to reduce the required torque T and lower the current value (P _H is constant to maintain the injection piston pressure). is there.

T = CXA _B XPH

 (Second embodiment)

 Next, the die casting machine injection device 100 according to the second embodiment of the present invention will be described. FIGS. 7 and 8a to 8g show a die casting machine injection device 100 according to the second embodiment of the present invention, and FIG. 7 shows a second embodiment of the die casting machine injection device. FIG. 8A to FIG. 8G are explanatory diagrams showing states of the hydraulic circuit in various work processes in the die casting machine. Elements in FIGS. 7 and 8a to 8g that are the same as or similar to the elements in the first embodiment shown in FIGS. 1 and 2a to 2f are designated by the same reference numerals. Has been.

In the first embodiment, the injection piston accumulator 3 1 No leakage of pressure oil from the valve (ie leakage from the valve M 2 4) is described, nor is the timing of filling the piston accumulator 31 for injection described. In the second embodiment, the configuration around the electric booth 8 and the configuration around the injection cylinder 16 are the same as those in the first embodiment, and a description thereof will be omitted. The hydraulic circuit of the second embodiment is a system in which the piston accumulator 31 for injection is charged (charged) by the booth evening 8, and is different from the hydraulic circuit of the first embodiment. Compared with the conventional hydraulic circuit in Fig. 10 of the hydraulic system, the comparison is clear.

 In the hydraulic circuit of FIG. 7 of the second embodiment, the valve M 2 4, which is a motor valve that can be opened and closed at high speed, is installed on the outlet side of the piston accumulator for injection 3 1 (first However, pulp A 2 1 is provided in a line that branches off from the line between the piston accumulator 3 1 for injection and the valve M 2 4 (unlike the first embodiment). The same as the conventional example in Fig. 10). The line connecting booth evening 8 at booth evening 8 H and evening cylinder 16 at injection cylinder 16 6 is equipped with valve D (switching valve) 25, The line connecting the rod chamber 8 R and the valve M 24 is preferably provided with a motor valve 62 that can be opened and closed at a high speed, as shown in FIG.

 Next, the operation of the injection device 100 in the present embodiment will be described. Since the operation of each process in the present embodiment is basically the same as the operation in the same process in the first embodiment, the details of the operation described in the first embodiment, the state of the valve, etc. Since it is clear from the figure, the description is basically omitted in this specification.

FIG. 8a shows a filling (charging) process of the injection accumulator 31 for injection which is not explained in the first embodiment. Form of this implementation In this state, this filling step is performed immediately before the injection step. That is

The hot water supply process in FIG. 9 is performed. At this time, as shown in FIG. 8 a, the injection piston 15 has returned to the vicinity of the end of the injection cylinder head chamber side. The booster piston rod 5 is driven downward (advanced) by the servo motor evening 1 and pushes the hydraulic oil in the booth evening chamber 8 H at a low speed. At this time, the valve D 2 5 Therefore, the hydraulic oil passes through valve D 2 5 and check valve 6 4 and is filled in the piston accumulator 3 1 for injection. The line branching to the tank 3 5 of the line 6 1 is provided with a check valve 6 5 to block the flow of hydraulic oil to the tank 3 5. In this process, the filling is completed by providing a pressure sensor (not shown) on the line connecting the injection accumulator 3 1 and the valve A 2 1, measuring the pressure in this line, and reaching the predetermined pressure. It may be detected and completion of filling. Separately, a sensor (not shown) that detects the position of the piston is installed in the piston accumulator for injection 3 1, thereby detecting that the piston has reached a predetermined position and filling it. May be completed. In FIG. 8a, the supply of hydraulic oil to the booster rod chamber 8R is performed by gravity from the tank 35 through the motor valve 62, but is described separately in the first embodiment. It may be implemented by a pump as well.

A low speed injection process is performed after the filling process. Fig. 8b shows the state of the hydraulic circuit during low-speed injection (process) corresponding to Fig. 2a of the first embodiment. During low-speed injection, the valve D 25 is switched so that the booster head chamber 8 H and the injection cylinder head chamber 16 H are in contact with each other, and the booth evening piston rod 5 is further lowered to perform the first operation. In the same way as above, hydraulic fluid is supplied to the injection cylinder head chamber 16H. At this time, the low-speed forward speed of injection is used to control the rotation speed of servo motor 1. So do it.

 FIG. 8 c shows the state of the hydraulic circuit at the time of high-speed injection (step) corresponding to FIG. 2 b of the first embodiment. During high speed injection, valve D 2 5 is set so that booster head chamber 8 H and injection cylinder head chamber 16 H communicate with each other, and valve M 24 is opened. The hydraulic oil from the piston accumulator 3 1 for injection is also introduced into the injection cylinder head chamber 16H. This is the same as in the first embodiment. As shown in Fig. 8c, the hydraulic oil in the injection cylinder rod chamber 1 6 R is returned to the tank 3 5 via the valve M 2 4 and passes through another line 6 8 to the throttle 2 8 and the open state. The valve B (switching valve) 2 2 is returned to the tank 3 5 in this order. To switch from the low-speed injection process to the high-speed injection process, a position detection sensor (not shown) for the injection piston 15 is provided to detect that the injection piston 15 has reached a preset position. To be implemented.

FIG. 8d shows the state of the hydraulic circuit during pressure increase corresponding to FIG. 2c of the first embodiment. During pressurization (process), valve D 2 5 is set so that the booth evening chamber 8 H and the injection cylinder header chamber 16 H communicate with each other, but valve M 2 4 is switched. Therefore, a part of the hydraulic oil in the injection cylinder head chamber 16 H is connected to the valve M 2 4 and valve A 2 1 (valve A 2 1 is open). Return to tank 3-5. The hydraulic oil in the injection cylinder rod chamber 16 R is returned to the tank 35 via the throttle 28 and the valve B 22 (open state) as shown in Fig. 8d. At that time, the pressure in the injection cylinder head chamber 16 H is fed back in real time according to the boost pattern preset by the valve M 24, and the boost upper limit value is determined by the torque control of the thermop overnight. The aperture amount of aperture 28 is set to be constant. In this way, the boost pressure is maintained at an appropriate value. Is done. Switching from high-speed injection process to pressurization process is done by injection piston.

1 5 This is carried out by detecting that it has reached a preset position, or the value detected by the pressure detection sensor (not shown) of the injection cylinder head pressure (PH) is set in advance. It is carried out by detecting that the value reached is reached. The boost feedback control is not performed by the servo motor 1 alone (valve M 2 4 is also used). The reason is that the inertial force of the shaft conversion is large and the control response is poor, so the response is good. Feedback control is realized by controlling the valve M 2 4. The maximum pressure is controlled by the torque control of the support motor 1.

 FIG. 8 e shows the state of the hydraulic circuit during pressurization and holding corresponding to FIG. 2 d of the first embodiment. Valve during pressure holding (process)

D 2 5 continues with booster head chamber 8H and injection cylinder head chamber

1 6 H is set to communicate, but the motor valve 6 2 is switched, and a part of the hydraulic oil in the injection cylinder head chamber 1 6 H passes through the motor valve 6 2. And returned to Boosterlo H room 8 R. Injection cylinder rod chamber 1 6 The hydraulic fluid in R is shown in Fig. 8e.

Returned to tank 3 5 via 8 and valve B 2 2.

FIGS. 8f and 8g show the state of the hydraulic circuit during the ejecting operation (process) and the backward operation (process) corresponding to FIGS. 2e and 2f of the first embodiment. The hydraulic circuit during these operations is basically the same as that of the first embodiment as shown in FIGS. 8f and 8g, and thus detailed description thereof is omitted. However, during the reverse operation shown in Fig. 8g, the booth evening piston rod 5 is raised by the thermopow 1 to push out the hydraulic fluid in the booster rod chamber 8R, and this hydraulic fluid is injected into the injection cylinder rod chamber. By feeding to 1 6 R, drive the injection piston 1 5 in Fig. 8 g back in the direction. At this time, the motor valve 6 2 and the valve Lub D 2 5 is operated, and the hydraulic oil in injection cylinder head chamber 1 6 H passes through motor valve 6 2, valve D 2 5 and check valve 6 5 as shown in Fig. 8 g. The booth evening headroom will be supplied to 8H.

 As described in the second embodiment above, in the case of an electric booth evening type injection device, the injection low speed is operated by the electric booth evening, and the high speed injection is operated by the accumulator (A C C). As described above, the conventional machine shown in FIG. 10 performs injection of the low-speed and high-speed stroke of the injection piston 15 with the pressure oil of the piston accumulator 31. On the other hand, in this embodiment, the oil supply capacity of the electric booth evening is large, and the amount of molten metal charged to the accumulator evening is about half that of the conventional machine. ACC) The charge can be fully implemented.

 Regarding the above explanation, see Fig. 11 which shows a table comparing the accumulator charge (filling) time and the shortest hot water supply time for the actual actual machine. In the hot water supply process, the accumulator charge (fill) is Explain what is possible. Fig. 11 shows that the accumulator (A C C) charge is completed within the hot water supply time on the mold clamping machine 3 75 t to 4 00 0 t. The maximum speed required for low-speed injection is 0.5 mZ sec or more (actually set to 0.8 m / sec or 1. O m / sec), and the maximum amount of molten metal supplied into the injection sleeve Is at most 70% of the sleeve's internal volume. Therefore, the maximum required volume of accumulator evening (A C C) used for high-speed injection is 70% of the total stroke X cylinder area.

 The accumulator charge time (t) shown in Fig. 11 can be obtained by the following formula.

V = AXLX 0. 7 X 1 0-4 (Little) · · • [Formula 1] Q = AX 5 0 0 X 1 0— 4 (Little / sec)

• [Formula 2]

 t = VZQ = (L X 0. 7) / 5 0 0 ···, [Equation 3]

 Where, V: Required oil amount (liter) supplied to injection cylinder for high speed, A: Injection cylinder area (cm 2), L: Total injection stroke (mm), Q: Electric booster supply oil capacity (Little sec), t; ACC charge time (sec).

 A third embodiment of the hybrid high-speed injection device of the present invention (the device of the present invention) will be described with reference to the drawings. Figure 12 shows the structure of the device of the present invention. Fig. 21 shows another structure of the device of the present invention.

 1) First, the structure shown in FIG. 12 and its driving mode will be described. In the structure shown in Fig. 12, the movable mold 10 4 fixed to the movable plate 10 0 2 is closed with respect to the fixed die 10 3 fixed to the fixed plate 10 1. A mold cavity 1 0 5 is formed. An injection sleeve 10 6 is connected to the fixed mold 10 3, and a plunger rod 1 0 8 having a plunger tip 1 0 7 sliding at the tip of the injection sleeve 1 0 6 is driven at a high speed. The molten metal held in the injection sleep 10 6 is filled into the mold cavity 1 0 5.

 The rear end of the plunger rod 1 0 8 constitutes a piston 1 1 3 that slides in the hydraulic cylinder 1 0 9, and the plunger rod 1 0 8 is a hydraulic control mechanism including the hydraulic cylinder 1 0 9 Driven by 1 1 0.

The hydraulic control mechanism 1 1 0 includes an accumulator 1 1 1 connected to a hydraulic cylinder 1 0 9 via a high-speed valve 1 1 2, and activates the electromagnetic switching mechanism M according to a control signal (not shown) to activate the high-speed valve. Open 1 1 2, supply hydraulic oil from Accumule overnight 1 1 1 to oil chamber 1 1 6 H behind piston 1 1 3, and drive plunger rod 1 0 8. In order to control the drive of the plunger rod 10 8 with high accuracy, the hydraulic oil 1 1 6 R and 1 16 H in the accumulator 1 1 1 and in the hydraulic cylinder 1 0 9 A hydraulic sensor (not shown) that detects hydraulic pressure is installed.

 Piston 1 1 3 In the oil chamber 1 1 6 H behind the piston chamber, the plunger rod 1 10 8 is controlled with high precision to produce high-quality forged products with high yield. A piston rod 1 1 4 is provided that moves back and forth in the direction of 10 8 and retreats and realizes high-speed injection in cooperation with the plunger rod 10 8 at the time of injection. In this respect, the rear end of the piston rod 1 1 4, which is a feature of the present invention, is connected to the end of the pole screw 1 1 7 of the pole screw mechanism 1 1 8 via the connecting member 1 1 5. The piston rod 1 1 9 and the pole screw mechanism 1 1 8 and the rod rod mechanism 1 1 8 are controlled by the rotation of the servo motor 1 1 9 according to the signal from the control device (not shown) that constitutes the advance / retreat control mechanism. It is possible to control the advance / retreat of 4 including the advance / retreat speed.

 In other words, the piston rod 1 1 4 and the plunger rod 1 0 8 are integrated or separately by rotating the support rod 1 1 9 to the left and right at the required number of revolutions according to the control signal. 0 7 can be pushed into the injection sleeve at the required speed for the required distance.

 In this way, at the time of injection, the advance / retreat control mechanism does not directly drive the plunger rod or the hydraulic control mechanism, but cooperates with the plunger rod behind the plunger rod controlled by the hydraulic control mechanism. It is a feature of the present invention that a piston rod that realizes high-speed ejection is arranged, and the advance and retreat of the piston rod is controlled by the advance / retreat control mechanism.

That is, in the present invention, the hydraulic control mechanism and the advance / retreat control mechanism are combined. The hybrid high-speed injection structure that synergistically exerts its effects is a feature.By adopting this, the drive of the plunger rod is controlled with high accuracy, and high-quality forged products are produced with high yield. Can be manufactured.

 The forward / backward control mechanism is a mechanism that only controls the forward / backward movement of the piston rod. Therefore, when the hydraulic control mechanism is advanced / retracted or when the plunger rod is advanced / retracted (in this case, the plunger The advance / retreat control mechanism can be made smaller and lighter than the control system (including the hydraulic control mechanism). This is also a feature of the present invention.

 Fig. 12 shows the pole screw mechanism 1 1 8 as one configuration of the advance / retreat control mechanism. However, the advance / retreat control mechanism is a mechanical mechanism that moves the piston port forward or backward with good controllability. Well, it is not limited to the pole screw mechanism. The advance / retreat control mechanism may be, for example, a rack and pinion mechanism.

 Next, the basic drive mode of the device of the present invention shown in FIG. 12 will be described based on FIGS. 13 to 19.

 Fig. 13 shows the aspect of the apparatus of the present invention immediately before the injection is started after a predetermined amount of molten metal is poured into the injection sleeve from the pouring port (not shown) (see Fig. 12). At this time, the plunger rod 1 0 8 is retracted to the end of the hydraulic cylinder 1 0 9 and the piston rod 1 1 4 is in contact with the piston 1 1 8 of the plunger rod 1 0 8 and waits. Yes.

Next, as shown in FIG. 14, the servo motor 1 1 9 is rotated according to the control signal to drive the ball screw mechanism 1 1 8, and the piston rod 1 1 4 is integrated with the plunger rod 1 0 8 to be predetermined. Move forward against the stationary plate at a speed of. At this time, the electromagnetic switching mechanism M is activated to close the high-speed valve 1 1 2 and in front of the piston rod 1 1 4 and the plunger rod 1 0 8 Following the progress, supply hydraulic oil to the oil chamber 1 1 6 H behind the piston 1 1 3 and discharge the hydraulic oil from the oil chamber 1 1 6 R ahead.

 The plunger rod 1 0 8 integrated with the piston rod 1 1 4 advances the low-speed injection region in the injection sleeve at a predetermined advance speed that the pole screw mechanism 1 1 8 forms and maintains.

 The forward distance of the plunger rod 10 8 is detected by a displacement sensor (not shown), and the tip of the plunger rod 10 8 8 switches from low-speed injection to high-speed injection (low-speed-high-speed switching position S, Fig. The plunger rod 1 0 8 is advanced only by the pole screw mechanism 1 1 8 until it reaches 1 4).

 The forward speed of the plunger rod 10 8 may be kept constant until the low speed / high speed switching position S is reached, or may be accelerated halfway.

 Plunger rod 1 0 8 ^ When the low-speed / high-speed switching position S is reached, the electromagnetic switching mechanism M is activated and the high-speed valve 1 1 2 is opened as shown in Fig. 15. , Supply hydraulic oil to the rear oil chamber 1 1 6 H and advance the plunger rod 1 0 8 at high speed. Hydraulic oil is discharged from the front oil chamber 1 1 6 R.

 Even after the plunger rod 1 0 8 reaches the low-speed 1 high-speed switching position S, the pole screw mechanism 1 1 8 is continuously driven to move the piston rod 1 1 4 forward and the oil chamber 1 1 6 H Pressurize hydraulic fluid. With this pressurization, the forward speed of the plunger rod 108 can be further increased, and the molten metal in the injection sleeve can be filled into the mold cavity at a stable high speed. As a result, high-quality manufactured products can be manufactured with high yield.

This is a functional feature of the apparatus of the present invention that employs a high-speed high-speed injection structure. In the device of the present invention, the plunger rod is at the low speed / high speed switching position.

Until it reaches S, the plunger rod is integrated with the piston rod and advanced only by the advance / retreat control mechanism without driving the hydraulic control mechanism, and the plunger rod moves to the low-speed switching position S. When it arrives, it adopts a hybrid high-speed injection structure that drives the hydraulic control mechanism and advances the plan jar rod at high speed in cooperation with the advance / retreat control mechanism and the hydraulic control mechanism.

 In the hybrid high-speed injection structure, the advance / retreat control mechanism only needs to have a function and capacity to advance / retreat the piston rod integrated with the plunger or the piston rod alone, so that the entire hydraulic control mechanism is advanced / retreated. Compared to the conventional mechanism, it can be further reduced in size and weight. As a result, the entire injection device is reduced in size and weight, and the maintainability of the injection device is improved.

 As described above, the feature of the apparatus of the present invention is that the size, weight, and maintainability are remarkably achieved.

 When the filling of the molten metal is completed, the forward movement of the plunger rod 10 8 almost stops and the head pressure rises. In the device of the present invention, the advance / retreat control mechanism and the hydraulic pressure are increased until the increased pressure reaches a predetermined value. Drive the control mechanism continuously.

 When the upper pressure boost reaches the specified value, as shown in Fig. 16, the high speed valve 1 1 2 is closed, the hydraulic oil in the front oil chamber 1 1 6 R is connected to the discharge path, and the advance / retreat control mechanism continues. Drive the piston rod 1 1 4 forward.

As piston rod 1 1 4 advances, hydraulic oil in the rear 1 1 6 H is discharged from the discharge path while pressure is continuously applied to plunger rod 1 0 8 Plunger rod 1 0 8 advances further and the head pressure further increases. Continue to drive the advance / retreat control mechanism to move the piston rod 1 1 4 forward, and at the same time, the high-speed valve 1 1 2 is controlled in real time according to the injection pressure setting shown in Fig. 20. As shown, the hydraulic oil in the oil chamber 1 1 6 H is accumulated in the accumulator 1 1 1. The set pressure Pm is maintained by the torque control of the servo motor until the cooling time expires and die casting is completed.

 After removing the fabricated product, the solidified material remaining in the injection sleeve is discharged, and as shown in Fig. 18, the advance / retreat control mechanism is driven again, and piston rod 1 1 4 and plunger rod 1 Move 8 8 together.

 After discharging the remaining coagulated material, as shown in Fig. 19, the hydraulic control mechanism is driven to supply hydraulic oil to the oil chamber 1 1 6 R in front of the piston 1 1 3, and the piston 1 1 3 The hydraulic oil is discharged from the rear oil chamber 1 1 6 H, and the advance / retreat control mechanism is driven to retract the plunger rod 1 0 8 and the piston rod 1 1 4 to prepare for the next injection. 1 Wait at the position shown in 3.

 In addition, when supplying hydraulic oil to the oil chamber 1 1 6 R in front of the piston 1 1 3 R, the hydraulic oil is replenished from the pump 1 2 1 in order to compensate for the reduced amount of hydraulic oil. The series of operations of the device has been explained, but the process of increasing the injection pressure based on this operation is different from the linear process of increasing the injection pressure in normal die casting fabrication. Figure 20 shows the relationship with the operation shown in 19. Figure 20 also shows the transition of the injection speed.

The injection speed in the device of the present invention has the same transition as the injection speed in normal die casting, but the injection pressure is different from the linear rise process in normal die casting (see dotted line in the figure) 2 steps Will rise. This is also a feature of the present invention.

 Under the driving mode of the advance / retreat control mechanism and hydraulic control mechanism shown in Fig. 15, when the filling of the molten metal is completed, the forward movement of the plunger rod almost stops and the head pressure starts to rise. Continues to drive the advance / retreat control mechanism and the hydraulic control mechanism until this increased pressure reaches a predetermined value (see P m 'in Fig. 20).

 When the upper pressure boost reaches the specified value and the specified time has elapsed (see Fig. 20), as shown in Fig. 16, the high speed valve 1 1 2 is closed and the drive of the hydraulic control mechanism is stopped. Continue driving the control mechanism and move the piston head 1 1 4 forward. As piston rod 1 1 4 advances, hydraulic oil in the rear oil chamber 1 1 6 H is discharged from the discharge path, and pressure is continuously applied to plunger rod 1 0 8, so the head pressure Rises again and reaches the set pressure (see P m in Fig. 20).

 As described above, in the apparatus of the present invention, the injection pressure can be controlled by the program and increased to the set pressure P m, so that a high-quality manufactured product can be manufactured with a high yield.

 2) Next, the structure shown in FIG. 21 and its driving mode will be described. The structure shown in Fig. 21 is basically the same as that shown in Fig. 12. In FIG. 21, the same configuration as that shown in FIG. 12 is given the same numeral as that in FIG. 12. However, a part of the hydraulic circuit constituting the hydraulic control mechanism is omitted. ing.

 The structural differences are that (i) the piston 1 1 3 oil chamber 1 1 6 H is provided perpendicularly to the hydraulic cylinder 1 0 9 and (ii) the oil chamber 1 1 6 A positioning member 1 2 2 that determines the retraction position of the plunger rod 10 8 is attached to the lower side wall of H.

Due to this structural difference, the drive mode is also different from the drive mode of the structure shown in FIG. 12. Therefore, the following description will be given based on FIGS. Fig. 2 2 shows the mode of the present invention just before starting injection after pouring a predetermined amount of molten metal Me into the injection sleeve from the pouring port (not shown) (see Fig. 21). . At this time, the plunger rod 1 0 8 is retracted to the end set by the positioning member 1 2 2 in the hydraulic cylinder 1 0 9, and the piston rod 1 1 4 is the oil chamber. 1 1 Waiting at the top of 6H.

 Next, as shown in Fig. 23, according to the control signal, the thermoplum 1 1 9 is rotated to drive the pole screw mechanism 1 1 8, and the piston rod 1 1 4 is moved below the oil chamber 1 1 6 H. Move forward.

 At this time, the high-speed valve 1 1 2 connected to the accumulator 1 1 1 is closed, and the hydraulic oil is not supplied to the oil chamber 1 1 6 H from another system circuit. , Piston rod 1 1 4 Follow the forward movement and move forward. While the plunger rod 10 8 is moving forward, the hydraulic oil is discharged from the front oil chamber 1 1 6 R.

 The plunger rod 1 0 8 is structurally not integrated with the piston rod 1 1 4, but its operation is integrated with the piston rod 1 1 4, and the predetermined advance that the pole screw mechanism 1 1 8 forms and maintains. The speed will advance the low speed injection area in the injection sleeve.

 The forward distance of the plunger rod 10 8 is detected by a displacement sensor (not shown), and the tip of the plunger rod 1 0 8 switches to the position where the low speed injection is switched to the high speed injection (the low speed one high speed switching position S, The plunger rod 1 0 8 is advanced only with the pole screw mechanism 1 1 8 through the advancement of the piston rod 1 1 4 until it reaches (see Fig. 14).

The forward speed of the plunger rod 10 8 may be kept constant until the low speed / high speed switching position S is reached, or may be accelerated halfway. When accelerating from the middle, increase the rotation speed of the support motor Plunger rod 1 0 8 force When the low-speed one high-speed switching position S is reached, as shown in Fig. 24, the electromagnetic switching mechanism M is activated to open the high-speed valve 1 1 2, and from the accumulator 1 1 1 to hydraulic oil The rear oil chamber 1 1 6

Supply to H and advance plunger rod 10 8 at high speed. Hydraulic oil is discharged from the front oil chamber 1 1 6 R.

 Even after the plunger rod 10 8 reaches the low-speed / high-speed switching position S, the pole screw mechanism 1 1 8 is continuously driven, and the piston port 1 1

Advance 4 downward and pressurize the hydraulic oil in the oil chamber 1 1 6 H. With this pressurization, the forward speed of the plunger rod 108 can be further increased, and the molten metal in the injection sleeve can be filled into the mold cavity at a stable high speed. As a result, a high-quality forged product can be produced with a high yield. This is the same as the drive mode of the structure shown in FIG.

 That is, in the device of the present invention shown in FIG. 21, the plunger rod 10 8 is structurally not integrated with the piston rod 1 1 4, but is integrated with the piston rod 1 1 4 in terms of operation. , 'The pole screw mechanism 1 1 8 will move forward in the low-speed injection area in the injection sleeve at a predetermined forward speed that is formed and maintained.

 After all, the drive mode of the device of the present invention shown in FIG. 21 is the same as the drive mode of the device of the present invention shown in FIG. 12, and the structure shown in FIG. 21 is the same as that of the hybrid high-speed injection structure. One.

 When the filling of the molten metal is completed, the forward movement of the plunger rod 10 8 almost stops and the head pressure rises. In the device of the present invention, the advance / retreat control mechanism and the hydraulic pressure are increased until the increased pressure reaches a predetermined value. Drive the control mechanism continuously.

When the upper pressure boost reaches a predetermined value, as shown in Fig. 25, the high speed valve 1 1 2 is closed, the hydraulic oil in the rear oil chamber 1 1 6 H is connected to the discharge path, The advance / retreat control mechanism continues to drive, and the piston rod 1 1 4 moves forward.

 As the piston rod 1 1 4 moves forward, the hydraulic oil in the front oil chamber 1 1 6 R is discharged from the discharge path and the pressure is continuously applied to the plunger rod 1 0 8, so the plunger rod 1 0 8 advances further and the head pressure further increases.

 Continue to drive the forward / backward control mechanism to move the piston rod 1 1 4 forward, and at the same time, the high-speed valve 1 1 2 is controlled in real time according to the injection pressure setting shown in Fig. 29. As shown, the hydraulic oil in the oil chamber 1 16 H is accumulated in the accumulator 1 1 1. Until the cooling time expires and die casting fabrication is completed, the set pressure P m is maintained by the torque control of the thermo-motor.

 After the forged product is taken out, the solidified material remaining in the injection sleeve is discharged. As shown in Fig. 27, the advancement / retraction control mechanism is driven again to move the piston rod 1 1 4 forward. Advance plunger rod 1 0 8 forward.

 After discharging the remaining coagulum, as shown in Fig. 28, the hydraulic control mechanism is driven to supply the hydraulic oil to the oil chamber 1 1 6 R in front of the piston 1 1 3 while the piston 1 1 3 Drain the hydraulic oil from the rear oil chamber 1 1 6 H and retract the plunger rod 1 0 8 and drive the advance / retreat control mechanism to retract the piston rod 1 1 4 Prepare for the next injection in the position shown in Fig. 22.

In addition, when supplying hydraulic oil to the oil chamber 1 1 6 R in front of the piston 1 1 6 R, the hydraulic oil is replenished from the pump 1 2 1 to compensate for the reduced amount of hydraulic oil. 2 A series of operations of the apparatus of the present invention shown in 1 were performed. The injection pressure based on the operations was set in advance, and the program Ascending by the real-time feedback control according to the ascending curve. This is shown in Fig. 29 in association with the operations shown in Figs. Figure 29 also shows the transition of injection speed. Industrial applicability

 As described above, according to the present invention, a high-quality manufactured product can be manufactured with a high yield. In addition, the present invention realizes further miniaturization and weight reduction, and has excellent maintainability. Therefore, the present invention has high applicability in the die casting industry.

 Next, effects and functions of the injection device according to the above embodiment will be described. The following effects can be exhibited by the first embodiment of the present invention.

• In the case of a hybrid type injection device of a die cast machine that performs injection boosting and pressurization holding after pressurization electrically, a switching valve is provided in the hydraulic circuit of the injection device during pressurization holding so that the injection cylinder head chamber By connecting the pressure to the booster piston rod chamber, the necessary maximum torque for the booster piston driving the booster piston rod can be reduced, avoiding the need for a large current to flow when holding pressure, Electric power loss can be prevented and the motor size can be reduced.

 • As a result, the size of the injection device itself can be reduced, and the manufacturing cost of the injection device can be reduced.

 The following operations and effects can be exhibited by the second embodiment of the present invention.

• In this embodiment, the oil supply capacity of the electric booth is large, and the amount of molten metal that is charged (filled) into the accumulator (ACC) is about half that of the conventional machine. Accumulation overnight charge can be performed in the process time. That is This shortens the time from completion of injection to the start of high-speed injection, reduces the amount of leakage from the circuit, and enables high-speed injection while the accumulator pressure is within the allowable value.

 • As a result, the logic valve at the outlet of the accumulator (A C C) can be eliminated, the pipe resistance can be greatly reduced, the required injection performance can be easily achieved, and the cost can be reduced.

 In the above description, the booth evening piston rod 5 is described as a configuration that is driven by a support motor 1 that is a driving source through a transmission mechanism including a pole nut gear 3 and a pole screw shaft 4. However, the present invention is not limited to this, and it may be replaced by another electric drive source known to those skilled in the art, such as an AC motor controlled by an inverter. The transmission mechanism may also be another transmission mechanism known to those skilled in the art, such as a rack-pinion type, for example. In the embodiment described above or shown in the accompanying drawings, the hydraulic circuit of the injection device is Although specified, the present invention is not limited to this, and the booster piston rod can be driven with a force corresponding to the product of the area of the booster piston rod and the pressure during pressure holding. Any hydraulic circuit that can be included within the scope of the present invention.

 The above embodiment is an example of the present invention, and the present invention is not limited by the embodiment, and is defined only by matters described in the claims, and other embodiments are also described. It can be implemented. Although the present invention has been described with reference to particular embodiments selected for purposes of illustration, numerous modifications can be made without departing from the basic spirit and scope of the present invention. It will be obvious to those skilled in the art.

Claims

1. An injection cylinder (16) for containing an injection piston (15) for injecting a molten metal such as aluminum into a die of a die casting machine, and a head chamber (16) of the injection cylinder (16) A hydraulic cylinder type electric booster that accommodates a rod booster piston rod (5) for carrying out injection molding by supplying pressure oil to Η) and pressing and moving the injection piston (15). (8) and

 In the injection device (10) of the die cast machine having the above, the head chamber (8mm) of the electric booster (8) is connected to the head chamber (16H) of the injection cylinder (16). Encircled,

 In the injection molding process, the electric booth (8) is pressurized with the head area of the electric booster (8) when the pressure is increased, and the load area of the electric booth (8) when the pressure is held. An injection device characterized by having a structure for pressurizing at a pressure.

 2. Connecting piping (4 1, 4 3) that fluidly connects the head chamber (16 mm) of the injection cylinder and the rod chamber (8R) of the booth (8)

The injection device according to claim 1, wherein a stop valve (25) for interrupting the flow of hydraulic oil is provided in the communication pipe.

 3. The injection apparatus according to claim 1 or 2, wherein the booster piston rod (5) is reciprocally driven by an electric motor (1).

 4. The injection apparatus according to claim 3, wherein the electric motor (1) is a sub-motor motor.

5. It further comprises an injection piston accumulator (3 1) for supplying pressure oil to the head chamber (16 mm) of the injection cylinder. The injection device according to any one of claims 1 to 4, wherein:

6. The rod chamber (8 R) of the booster is in fluid communication with the tank (3 5), and the rod chamber (8 R) of the booster is in fluid communication with the bank (3 5). The injection device according to any one of claims 1 to 5, wherein the pipe (4 3) to be provided is provided with a stop valve (2 6).

 7. The opening chamber (16 R) of the injection cylinder (16) is in fluid communication with the manifold (35) and the pressure oil supply port (36) from a pump or the like. The injection device according to any one of claims 1 to 6.

 8. The booster (8) further includes a pressure detection sensor (37) for detecting a head pressure that is a pressure of the head chamber (16H) of the injection cylinder (16). The injection device according to any one of claims 1 to 7, wherein

 9. An injection cylinder (16) for containing an injection piston (15) for injecting molten metal such as aluminum into the die of the die casting machine, and a head chamber (16) for the injection cylinder (16) The hydraulic cylinder type housing the booth evening piston rod (5) for carrying out injection molding by supplying pressure oil to H) and pressing and moving the injection piston (15). Electric booth evening (8),

 A predetermined amount of hydraulic oil can be stored at a predetermined maximum pressure, and pressure oil is also supplied to the head chamber (16H) of the injection cylinder (16) to supply the injection piston (15). A piston accumulator (3 1) formed so as to be able to be pressed and moved. The piston accumulator (3 1) performs injection molding in cooperation with the electric booth (8). ,

Provided on the exit side of the piston accumulator (31) And a first switching valve (2 4) capable of opening and closing the flow path of the pressure oil from the outlet,

 In the die casting machine injection device (100) having the above-mentioned configuration, the pressure oil is supplied to the piston accumulator (3 1) immediately before the injection starts, so that the first switching valve (2 4) An injection device characterized in that a logic valve that should be provided at the outlet of the piston accumulator (31) can be removed in order to prevent leakage of pressurized oil.

 10. The head chamber (8 H) of the electric booster (8) is in fluid communication with the head chamber (16 H) of the injection cylinder (16), and the piston accumulator (31). The second switching valve (2 5) is in fluid communication with the outlet of the electric booth, and is connected to the fluid passage between the electric booth head chamber (8 H) and the injection cylinder head chamber (16 H). Is provided,

 The second switching valve (25) is connected to the flow path communicating with the electric booster head chamber (8 H) and the tank (35) for storing hydraulic oil on one flow path connection side. A fluid connection is established with the fluid passage to be communicated. On the other fluid passage connection side, the fluid passage is communicated with the head chamber (16H) of the injection cylinder (16), and the piston accumulator (31) 10. The injection device according to claim 9, wherein the injection device is fluidly connected to a flow path communicating with the fluid.

 1 1. Supply of pressure oil to the piston accumulator (31) is performed by the electric booth (8), and pressure oil in the head chamber (8H) of the electric booster (8) is pressed. The injection device according to claim 9 or 10, wherein the injection device is supplied after being supplied.

1 2. After the injection operation is completed, the booster (8) is used to return the injection piston (15) to the head side end of the injection cylinder (16). The injection device according to any one of claims 9 to 11, wherein the pressure oil is supplied to the rod chamber (16R) of the injection cylinder (16) by driving the pressure oil.

 1. A third switching valve (6 2) provided in a flow path for fluid communication between the electric booster rod chamber (8 R) and the injection cylinder head chamber (16 H) is further provided. And

 The first switching valve (24) has a flow path communicating with the piston accumulator (3 1) and a flow path communicating with the tank (35) where hydraulic oil is stored on one flow path connection side. A fluid connection to the passage, and on the other flow passage connection side, a flow passage communicating with the head chamber (16H) of the injection cylinder (16) and a rod of the injection cylinder (16) Room

(16 R) is fluidly connected to the flow path communicating with

 The third switching valve (6 2) includes a flow path communicating with the tank (3 5) on one flow path connection side, and the electric booster rod chamber.

(8 R) is fluidly connected to the flow path communicating with the flow path, and the other flow path connecting side is connected to the flow path communicating with the rod chamber (16 R) of the injection cylinder (16). The injection device according to any one of claims 10 to 12, wherein the injection device is fluidly connected to a flow path communicating with the head chamber (16H) of the injection cylinder (16).

 1 4. The hot water supply process is performed immediately before the start of injection, and the supply of pressure oil to the piston accumulator (3 1) is completed during the hot water supply process. The injection device according to any one of the above.

 1 5. The injection apparatus according to any one of claims 9 to 14, wherein the booster piston rod (5) is reciprocally driven by an electric motor (1).

1 6. The electric motor (1) is a single motor. The injection device according to claim 15.

 1 7. In the injection device that drives the plunger and fills the mold cavity with molten metal,

 A hybrid high-speed injection device with excellent controllability, characterized in that a piston rod controlled by the advance / retreat control mechanism is provided behind the hydraulic cylinder that contains the plunger rod controlled by the hydraulic control mechanism.

 18. The hybrid high-speed injection device with excellent controllability according to claim 17, wherein the advance / retreat control mechanism is a pole screw mechanism.

 19. The hybrid high-speed injection device with excellent controllability according to claim 18, wherein the pole screw mechanism is driven by a support motor.

 20. A piston rod controlled by the advance / retreat control mechanism is provided behind the hydraulic cylinder containing the plunger rod controlled by the hydraulic control mechanism, and the hydraulic control mechanism and the advance / retreat control mechanism are driven in cooperation with the molten metal. In a control method for controlling filling of mold cavities of

 (i) Drive the advance / retreat control mechanism to integrate the plunger rod with the piston rod until it reaches the low speed / high speed switching position.

 (i i) Drive the hydraulic control mechanism and advance the plunger at high speed in cooperation with the advance / retreat control mechanism

A hybrid high-speed injection control method.

 21. The hybrid high-speed injection control method according to claim 20, wherein the hydraulic control mechanism is driven by real-time feedback control according to a rising curve up to a preset injection pressure.