CN116214866A - A precision injection mold for auto parts - Google Patents

Abstract

The invention discloses an automobile accessory precision injection mold, which belongs to the technical field of injection molds and comprises a lower mold and an upper mold, wherein a lower pressure buffer assembly is arranged between the lower mold and the upper mold, and the impact force generated when the upper mold is in butt joint with the lower mold is buffered by utilizing air pressure and elastic force; the side end face of the lower die is provided with a telescopic slot, the end face of the inner side of the telescopic slot is provided with a telescopic opening, and the telescopic opening and the telescopic slot are connected with the same group of unidirectional plugging components in an embedded mode. According to the invention, the inner surfaces of the upper die cavity and the lower die cavity are subjected to preheating treatment, so that the filling speed of molten liquid in the upper die and the lower die can be increased, the molten liquid can be filled into a narrow gap, and the temperature of the inner surfaces of the upper die cavity and the lower die cavity is increased, so that the cooling and solidification speeds of the molten liquid can be kept consistent, and the quality of finished products of injection-molded products of automobile parts can be improved.

Description

A precision injection mold for auto parts

technical field

The invention belongs to the technical field of injection molds, in particular to a precision injection mold for auto parts.

Background technique

Injection molding, also known as injection molding, is a molding method of injection and molding. The advantages of the injection molding method are fast production speed, high efficiency, automatic operation, various designs and colors, simple to complex shapes, large to small sizes, accurate product sizes, easy replacement of products, and complex shapes. Parts, injection molding is suitable for mass production and complex shape products and other molding processing fields.

Some invention patents in the field of injection mold technology are disclosed in the prior art, among which Chinese patent CN112757579B discloses an injection mold for the production and processing of auto parts, including a right mold and a left mold, and the inner side of the right mold is uniformly and alternately provided with fixed columns and fixing grooves, the inner side of the left mold is uniformly and alternately provided with another fixing groove and another fixing column, and the fixing column is matched with the fixing groove. When the mold is injected, the pressure in the mold squeezes the vent plug, and the vent plug moves to the outside of the vent hole under the pressure, and the vent hole is automatically opened. The gas can be discharged. When there is no excess gas in the mold, the resilience of spring 1 can pull the exhaust plug inward, so that the exhaust plug can be engaged with the exhaust hole, and the exhaust plug blocks the exhaust hole. The inner wall of the mold can remain intact, which facilitates the molding of injection molded parts.

The precision injection mold for auto parts in the prior art still has some deficiencies in the process of use. During the production and processing of the injection mold, the hot air flow inside the mold cannot be discharged, so that the mold itself will be damaged due to the expansion of the hot air flow. In the process of injecting the injection molding liquid into the mold, the temperature of the inner surface of the mold is easily affected by the surrounding working environment. The parts in contact with the surface of the cavity have higher cooling, which easily affects the quality of injection molded parts.

Based on this, the present invention designs a precision injection mold for auto parts to solve the above problems.

Contents of the invention

The purpose of the present invention is: in order to solve some deficiencies in the process of using the precision injection mold for auto parts in the prior art, during the production and processing process of the injection mold, the hot air flow inside the mold cannot be discharged, so that The expansion of the hot air flow causes damage to the mold itself. During the process of injecting the injection molding liquid into the mold, the inner surface temperature of the mold is easily affected by the surrounding working environment. When the working environment temperature is low, the injection molding liquid flows from the upper mold cavity to the lower mold. In the process of the cavity, the part in contact with the surface of the cavity is cooled more, which is easy to affect the quality of the injection molded parts, and a precision injection mold for auto parts is proposed.

In order to achieve the above object, the present invention adopts the following technical solutions:

A precision injection mold for auto parts, including a lower mold and an upper mold, a lower pressure buffer assembly is arranged between the lower mold and the upper mold, and the impact force generated when the upper mold and the lower mold are docked is buffered by air pressure and elastic force ;

The side end surface of the lower mold is provided with a telescopic groove, and the inner end surface of the telescopic groove is provided with a telescopic opening, and the same group of one-way sealing components is embedded in the telescopic opening and the telescopic groove, and the side end surface of the lower mold is A docking cover is fixedly connected to the position corresponding to the one-way blocking assembly, and the other side of the docking cover is clamped with a hot gas introduction pipe, and the other end of the hot air introduction pipe is connected to the outer surface of the downforce buffer assembly. bottom.

As a further description of the above technical solution:

The lower pressure buffer assembly includes a high-pressure cylinder, one end of the high-pressure cylinder is fixedly connected to the top of the lower mold, and a sealing sleeve is snapped into the port of the other end of the high-pressure cylinder, and a buffer shaft is sleeved in the sealing sleeve A piston disc is fixedly connected to the end of the buffer shaft, and the opposite surface of the piston disc and the sealing sleeve is fixedly connected through a buffer spring, and the buffer spring is sleeved on the outer surface of the buffer shaft.

As a further description of the above technical solution:

A docking cylinder is arranged above the buffer shaft, and the top end of the docking cylinder is fixedly connected to the bottom of the upper mold, and a docking hole is opened at the bottom of the upper mold corresponding to the position of the docking cylinder.

As a further description of the above technical solution:

The one-way blocking assembly includes a push plate, the push plate is embedded in the telescopic groove, the inner end surface of the telescopic groove is fixedly connected with an orientation shaft, and the orientation shaft is slidably connected to the side end surface of the push plate In the directional hole opened;

A pushing spring is sleeved on the outer surface of the orientation shaft, one end of the pushing spring is fixedly connected to the inner end surface of the telescopic slot, and the other end of the pushing spring is fixedly connected to the side close to the pushing plate.

As a further description of the above technical solution:

The other end of the hot gas introduction pipe is connected to the bottom of the outer surface of the high-pressure cylinder, and a first valve is arranged on the hot gas introduction pipe.

As a further description of the above technical solution:

The side end surface of the upper mold is provided with a docking groove corresponding to the position of the docking hole, and a plugging support assembly is sleeved in the docking groove, and the plugging support assembly acts as a plug to the docking hole for receiving Buffer shaft.

As a further description of the above technical solution:

The blocking support assembly includes a blocking support plate, which is sleeved in the docking groove, and a series connection hole is opened at a position corresponding to the docking hole on the top of the blocking support plate.

As a further description of the above technical solution:

The end of the blocking support plate far away from the upper mold is hinged with an adapter frame through a pin shaft, and the side of the other end of the adapter frame is rotatably connected with an adapter shaft through a bearing, and the outer surface of the adapter shaft is rotatably connected with a bearing. There is a handle, and one end of the handle is hinged with an adapter seat through a spring pin, and the bottom of the adapter seat is fixedly connected to the top of the upper mold.

As a further description of the above technical solution:

The top of the upper mold is provided with a molten liquid injection port, the outer surface of the molten liquid injection port is clamped with a hot gas release pipe, and the other end of the hot gas release pipe is clamped at the bottom of the outer surface of the high-pressure cylinder.

As a further description of the above technical solution:

The hot gas release pipe is provided with a second valve, and the one-way blocking direction of the second valve is opposite to that of the first valve.

A method for using a precision injection mold for auto parts, the method comprising the following steps:

S1: After taking out the auto parts injection molded parts in the mold cavity, control the hydraulic pushing equipment to push the upper mold to move towards the lower mold until the upper mold and the lower mold are docked and control the hydraulic pushing equipment to stop running;

S2: During the movement of the upper mold to the lower mold, before the upper mold and the lower mold are docked, the buffer shaft will enter the docking cylinder, and finally touch the bottom of the blocking support plate, and the bottom of the blocking support plate will buffer The shaft exerts a downward thrust until the upper mold and the lower mold are docked. Under the action of the downward thrust, the buffer shaft slides in the sealing sleeve and pushes the piston plate to slide downward in the high-pressure cylinder. During this process, on the one hand, the piston The disk will squeeze and compress the hot gas under the corresponding piston disk inside the high-pressure cylinder. The hot gas will produce a reaction thrust against the piston disk when it is squeezed and compressed. Deformation, the piston disc exerts a reactive elastic force on the buffer shaft;

S3: After the upper mold and the lower mold are docked, the first valve is opened first. At this time, the compressed hot air in the high-pressure cylinder is introduced into the cavity of the lower mold through the hot air introduction pipe, and the hot air in the cavity of the lower mold It flows upward into the cavity of the upper mold, and finally is discharged through the injection port of the molten liquid. The inner surface of the cavity of the lower mold and the upper mold is preheated by hot air flow, and after the preheating treatment, the inner surface of the cavity of the lower mold The temperature of the upper mold cavity is slightly higher than the temperature of the inner surface of the upper mold cavity, so the molten liquid flows into the lower mold cavity from the upper mold cavity through the molten liquid injection port, the molten liquid and the inner surface of the upper mold cavity and the lower mold cavity The temperature of the inner surface is close to;

S4: Press the handle hard, and the handle rotates with the adapter seat as the rotation node, which will generate a thrust to the plugging support plate, and the plugging support plate will slide in the docking groove, and the series connection hole and the docking hole on the plugging support plate will slide after sliding In the fully conducting state, under the action of the return elastic force of the buffer spring, the piston disc slides upward in the high-pressure cylinder, the first valve is closed, the second valve is opened, and the molten liquid is released in the cavity of the upper mold and the cavity of the lower mold. The hot gas is introduced into the high-pressure cylinder through the hot gas release pipe.

In summary, owing to adopting above-mentioned technical scheme, the beneficial effect of the present invention is:

1. In the present invention, the hot air flow sucked into the high-pressure cylinder is used as a medium for preheating the inner surface of the upper mold cavity and the inner surface of the lower mold cavity, which has a certain effect of energy saving and emission reduction. The interior is ventilated to reduce the loss of the mold, and the inner surface of the lower mold and the upper mold cavity are preheated by hot air flow, and after the preheating treatment, the temperature of the inner surface of the lower mold cavity is slightly higher than that of the upper mold The temperature of the inner surface of the mold cavity, so that during the process of the molten liquid flowing from the upper mold cavity to the lower mold cavity through the molten liquid injection port, the temperature of the molten liquid is close to that of the inner surface of the upper mold cavity and the inner surface of the lower mold cavity. Preheating the inner surface of the upper mold cavity and the inner surface of the lower mold cavity can speed up the filling speed of the molten liquid in the upper mold and the lower mold, thereby facilitating the filling of the molten liquid into the narrow gap, and by lifting the upper The temperature of the inner surface of the mold cavity and the inner surface of the lower mold cavity is conducive to promoting the cooling and solidification speed of the molten liquid to be consistent, thereby improving the quality of the finished product of injection molded auto parts.

2. In the present invention, press the handle hard, and the handle rotates with the adapter seat as the rotation node, which will generate thrust to the plugging support plate, and the plugging support plate will slide in the docking groove, and the serial connection on the plugging support plate after sliding The hole and the docking hole are in a fully conductive state. Under the action of the return elastic force of the buffer spring, the piston plate slides upward in the high-pressure cylinder, the first valve is closed, the second valve is opened, and the molten liquid is in the upper mold cavity and the lower mold cavity. The hot air emitted from the inside is introduced into the high-pressure cylinder through the hot air release pipe, and the hot air sucked into the high-pressure cylinder is used as a preheating medium for the inner surface of the upper mold cavity and the inner surface of the lower mold cavity, which has a certain effect of energy saving and emission reduction , to achieve ventilation with the inside of the upper mold and the lower mold cavity, reducing the loss of the mold.

3. In the present invention, during the movement of the upper mold towards the lower mold, before the upper mold and the lower mold are docked, the buffer shaft will enter into the docking cylinder, and finally abut against the bottom of the blocking support plate, and the sealing support plate The bottom of the bottom exerts a downward thrust on the buffer shaft until the upper mold and the lower mold are docked. Under the action of the downward thrust, the buffer shaft slides in the sealing sleeve and pushes the piston disc to slide downward in the high-pressure cylinder. During this process, On the one hand, the piston disc will squeeze and compress the hot gas under the corresponding piston disc inside the high-pressure cylinder, and the hot gas will generate a reactionary thrust to the piston disc when the hot gas is squeezed and compressed; on the other hand, the piston disc will also pull the buffer spring to perform stretching motion The buffer spring is elastically deformed, and the piston disc exerts a reactive elastic force on the buffer shaft. Under the joint action of the reactive elastic force and the reactive thrust, it avoids a strong collision between the upper mold and the lower mold when it collides with the lower mold, and plays a good buffer. The function is mainly based on the reverse thrust, supplemented by the reaction elastic force, which can reduce the working performance requirements of the buffer spring on the basis of having a good buffer effect.

Description of drawings

Fig. 1 is the overall structure schematic diagram of a kind of auto parts precision injection mold that the present invention proposes;

Fig. 2 is a schematic diagram of the upper and lower equiangular axis side structure of a precision injection mold for auto parts proposed by the present invention;

Fig. 3 is a structural schematic view of another angle of view of a precision injection mold for auto parts proposed by the present invention;

Fig. 4 is a structural schematic diagram of a plugging support assembly in a precision injection mold for auto parts proposed by the present invention;

Fig. 5 is a structural schematic diagram of a disassembled lower pressure buffer assembly in a precision injection mold for auto parts proposed by the present invention;

Fig. 6 is a schematic diagram of the disassembled one-way plugging assembly in a precision injection mold for auto parts proposed by the present invention;

Fig. 7 is an enlarged structural schematic diagram of A in Fig. 7 of a precision injection mold for auto parts proposed by the present invention.

illustration:

1. Lower mold; 2. Upper mold; 3. Lower pressure buffer assembly; 301. High-pressure cylinder; 302. Sealing sleeve; 303. Buffer shaft; 304. Piston disc; 305. Buffer spring; 306. Butt cylinder; 4. Expansion slot; 5. Expansion opening; 6. One-way plugging assembly; 601. Push plate; 602. Orientation shaft; 603. Push spring; 604. One-way plugging tube; 7. Docking cover; Tube; 9. Hot gas release pipe; 10. Melt liquid injection port; 11. Butt joint groove; 12. Blocking support assembly; 121. Blocking support plate; 122. Serial connection hole; 123. Adapter frame; Shaft; 125, handle; 126, adapter seat; 13, docking hole.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Please refer to Figures 1-7, the present invention provides a technical solution: a precision injection mold for auto parts, including a lower mold 1 and an upper mold 2, and a lower pressure buffer assembly 3 is arranged between the lower mold 1 and the upper mold 2, and is used Air pressure and elastic force buffer the impact force generated when the upper mold 2 and the lower mold 1 are docked;

The side end surface of the lower mold 1 is provided with a telescopic groove 4, and the inner end surface of the telescopic groove 4 is provided with a telescopic opening 5, and the same group of one-way sealing components 6 are embedded in the telescopic opening 5 and the telescopic groove 4, and the side end surface of the lower mold 1 A docking cover 7 is fixedly connected to the position corresponding to the one-way blocking assembly 6 , and the other side of the docking cover 7 is clamped with a hot gas introduction pipe 8 , and the other end of the hot gas introduction pipe 8 is connected to the bottom of the outer surface of the downforce buffer assembly 3 .

Specifically, the lower pressure buffer assembly 3 includes a high-pressure cylinder 301, one end of the high-pressure cylinder 301 is fixedly connected to the top of the lower mold 1, and a sealing sleeve 302 is snapped into the port of the other end of the high-pressure cylinder 301, and the sealing sleeve 302 is sleeved with a Buffer shaft 303, the end of buffer shaft 303 is fixedly connected with piston disc 304, the opposite surface of piston disc 304 and sealing sleeve 302 is fixedly connected by buffer spring 305, buffer spring 305 is sleeved on the outer surface of buffer shaft 303, buffer shaft 303 is provided with a docking cylinder 306, the top of the docking cylinder 306 is fixedly connected to the bottom of the upper mold 2, and the bottom of the upper mold 2 is provided with a docking hole 13 at a position corresponding to the docking cylinder 306.

The specific implementation method is: during the movement of the upper mold 2 towards the lower mold 1, before the upper mold 2 and the lower mold 1 are not docked, the buffer shaft 303 will enter into the docking cylinder 306, and finally abut against the sealing support plate 121. Bottom, the bottom of the blocking support plate 121 exerts a downward thrust on the buffer shaft 303 until the upper mold 2 and the lower mold 1 are docked. Under the action of the downward thrust, the buffer shaft 303 slides in the sealing sliding sleeve 302 and pushes the piston disk 304 slides downward in the high-pressure cylinder 301. During this process, on the one hand, the piston plate 304 will squeeze and compress the hot gas under the corresponding piston plate 304 inside the high-pressure cylinder 301, and the hot gas will be squeezed and compressed. Reaction thrust, on the other hand, the piston disc 304 will also pull the buffer spring 305 to do stretching movement, the buffer spring 305 will be elastically deformed, and the reaction elastic force will be applied to the buffer shaft 303 through the piston disc 304, under the joint action of the reaction elastic force and the reaction thrust, Avoid strong collisions when the upper mold 2 collides with the lower mold 1 .

Specifically, the one-way blocking assembly 6 includes a push plate 601, which is embedded in the telescopic groove 4, and an orientation shaft 602 is fixedly connected to the inner end surface of the telescopic groove 4, and the orientation shaft 602 is slidably connected to the push plate. In the directional hole opened on the side end surface of 601;

The outer surface of the orientation shaft 602 is sleeved with a push spring 603, one end of the push spring 603 is fixedly connected to the inner end face of the telescopic groove 4, and the other end of the push spring 603 is fixedly connected to the side close to the push plate 601, and the hot air is introduced The other end of the pipe 8 is connected to the bottom of the outer surface of the high-pressure cylinder 301, and the hot gas introduction pipe 8 is provided with a first valve.

The specific implementation method is: after the upper mold 2 is docked with the lower mold 1, the first valve is first opened, and at this time, the compressed hot gas in the high-pressure cylinder 301 is introduced into the mold cavity of the lower mold 1 through the hot gas introduction pipe 8, The hot air in the cavity of the lower mold 1 flows upward into the cavity of the upper mold 2, and finally is discharged through the molten liquid injection port 10, and the inner surfaces of the cavity of the lower mold 1 and the upper mold 2 are preheated by using the hot air.

Specifically, the side end of the upper mold 2 is provided with a docking groove 11 at the position corresponding to the docking hole 13, and the plugging support assembly 12 is sleeved in the docking groove 11, and the plugging support assembly 12 plays a role in blocking the docking hole 13. To receive the buffer shaft 303, the plugging support assembly 12 includes a plugging support plate 121, the plugging support plate 121 is sleeved in the docking groove 11, and the top of the plugging support plate 121 is provided with a serial connection hole 122 at a position corresponding to the docking hole 13, One end of the blocking support plate 121 away from the upper mold 2 is hinged with an adapter frame 123 through a pin shaft, and the side surface of the other end of the adapter frame 123 is rotatably connected with an adapter shaft 124 through a bearing, and the outer surface of the adapter shaft 124 is rotatably connected through a bearing. There is a handle 125, one end of the handle 125 is hinged with an adapter seat 126 through a spring pin, the bottom of the adapter seat 126 is fixedly connected to the top of the upper mold 2, and the top of the upper mold 2 is provided with a molten liquid injection port 10, and the molten liquid injection port The outer surface of 10 is clamped with a hot gas release pipe 9, and the other end of the hot gas release pipe 9 is clamped on the bottom of the outer surface of the high-pressure cylinder 301. The hot gas release pipe 9 is provided with a second valve, and the second valve is connected to the first valve alone. Reciprocal to the interception direction.

The implementation method is as follows: press the handle 125 firmly, and the handle 125 rotates with the adapter seat 126 as the rotation node, which will generate a thrust to the sealing support plate 121, and the sealing support plate 121 will slide in the docking groove 11, and the sealing support after sliding The serial connection hole 122 on the plate 121 is in a fully conductive state with the docking hole 13, and under the action of the return elastic force of the buffer spring 305, the piston disc 304 slides upward in the high-pressure cylinder 301, closing the first valve, opening the second valve, and melting The hot gas emitted by the liquid in the cavity of the upper mold 2 and the cavity of the lower mold 1 is introduced into the high-pressure cylinder 301 through the hot gas release pipe 9 .

A method for using a precision injection mold for auto parts, the method comprising the following steps:

S1: After taking out the auto parts injection molded parts in the mold cavity, control the hydraulic pushing equipment to push the upper mold 2 to move in the direction of the lower mold 1 until the upper mold 2 and the lower mold 1 are docked and control the hydraulic pushing equipment to stop running;

S2: During the movement of the upper mold 2 to the lower mold 1, before the upper mold 2 and the lower mold 1 are not docked, the buffer shaft 303 will enter into the docking cylinder 306, and finally abut against the bottom of the blocking support plate 121, sealing The bottom of the block support plate 121 exerts a downward thrust on the buffer shaft 303 until the upper mold 2 and the lower mold 1 are docked. The cylinder 301 slides downwards. During this process, on the one hand, the piston disk 304 will squeeze and compress the hot gas under the corresponding piston disk 304 inside the high-pressure cylinder 301. The compressed hot gas will produce a reactive thrust on the piston disk 304. On the other hand, the piston disc 304 will also pull the buffer spring 305 to perform stretching motion, the buffer spring 305 will be elastically deformed, and the piston disc 304 will exert a reactive elastic force on the buffer shaft 303;

S3: After the upper mold 2 is docked with the lower mold 1, first open the first valve, and at this time, the compressed hot gas in the high-pressure cylinder 301 is introduced into the mold cavity of the lower mold 1 through the hot gas introduction pipe 8, and the lower mold 1 The hot air flow in the mold cavity flows upward into the cavity of the upper mold 2, and finally is discharged through the molten liquid injection port 10, and the inner surfaces of the lower mold 1 and the upper mold 2 cavity are preheated by the hot air flow, and after preheating After the heat treatment, the temperature of the inner surface of the cavity of the lower mold 1 is slightly higher than the temperature of the inner surface of the cavity of the upper mold 2, so that the melt flows from the cavity of the upper mold 2 to the cavity of the lower mold 1 through the melt injection port 10 , the temperature of the molten liquid is close to that of the inner surface of the cavity of the upper mold 2 and the inner surface of the cavity of the lower mold 1;

S4: Press the handle 125 hard, the handle 125 rotates with the adapter seat 126 as the rotation node, and will generate a thrust to the blocking support plate 121, the blocking support plate 121 slides in the docking groove 11, and the sliding blocking support plate 121 The serial connection hole 122 and the docking hole 13 are in a fully conductive state. Under the action of the return elastic force of the buffer spring 305, the piston disc 304 slides upward in the high-pressure cylinder 301, closing the first valve and opening the second valve, and the molten liquid is on the upper The hot gas emitted from the cavity of the mold 2 and the cavity of the lower mold 1 is introduced into the high-pressure cylinder 301 through the hot gas release pipe 9 .

How it works, when used:

After taking out the auto parts injection molded parts in the mold cavity, control the hydraulic pushing equipment to push the upper mold 2 to move in the direction of the lower mold 1 until the upper mold 2 and the lower mold 1 are docked and control the hydraulic pushing equipment to stop running;

During the movement of the upper mold 2 towards the lower mold 1, before the upper mold 2 and the lower mold 1 are not docked, the buffer shaft 303 will enter into the docking cylinder 306, and finally abut against the bottom of the blocking support plate 121 to seal the support The bottom of the plate 121 exerts a downward thrust on the buffer shaft 303 until the upper mold 2 and the lower mold 1 are docked. During this process, on the one hand, the piston plate 304 will squeeze and compress the hot gas under the corresponding piston plate 304 inside the high-pressure cylinder 301, and the hot gas will produce a reaction thrust against the piston plate 304 when the hot gas is squeezed and compressed. On the other hand, the piston disc 304 will also pull the buffer spring 305 to perform stretching motion, and the buffer spring 305 will be elastically deformed, and the piston disc 304 will apply a reaction elastic force to the buffer shaft 303. When the docking collision occurs with the lower mold 1, a strong collision occurs, which plays a good buffering role. The reverse thrust is mainly used, and the reactive elastic force is supplemented. It can reduce the work on the buffer spring 305 on the basis of a good buffering effect. performance requirements;

After the upper mold 2 is docked with the lower mold 1, the first valve is first opened, and at this time, the compressed hot air in the high-pressure cylinder 301 is introduced into the mold cavity of the lower mold 1 through the hot air introduction pipe 8, and the mold cavity of the lower mold 1 The hot air flow inside flows upwards into the cavity of the upper mold 2, and finally is discharged through the molten liquid injection port 10, and the inner surfaces of the lower mold 1 and the upper mold 2 are preheated by using the hot air flow, and after the preheating treatment Finally, the temperature of the inner surface of the cavity of the lower mold 1 is slightly higher than the temperature of the inner surface of the cavity of the upper mold 2, so that the molten liquid flows from the cavity of the upper mold 2 to the cavity of the lower mold 1 through the molten liquid injection port 10, and melts The temperature of the liquid is close to that of the inner surface of the cavity of the upper mold 2 and the inner surface of the cavity of the lower mold 1. By preheating the inner surface of the cavity of the upper mold 2 and the inner surface of the cavity of the lower mold 1, the molten liquid can be accelerated in the upper mold. 2 and the filling speed in the lower mold 1, which is conducive to filling the molten liquid into the narrow gap, and by increasing the temperature of the inner surface of the cavity of the upper mold 2 and the inner surface of the cavity of the lower mold 1, it is beneficial to promote the cooling and solidification speed of the molten liquid Keep consistent, so as to improve the quality of finished auto parts injection molding products;

Press the handle 125 hard, and the handle 125 rotates with the adapter seat 126 as the rotation node, which will generate a thrust to the blocking support plate 121, and the blocking support plate 121 slides in the docking groove 11, and the string on the blocking support plate 121 after sliding The connecting hole 122 and the docking hole 13 are in a fully conductive state. Under the action of the return elastic force of the buffer spring 305, the piston disc 304 slides upward in the high-pressure cylinder 301, closing the first valve, opening the second valve, and the molten liquid is in the upper mold 2 The hot air emitted from the mold cavity and the lower mold 1 cavity is introduced into the high-pressure cylinder 301 through the hot air release pipe 9, and the hot air sucked into the high-pressure cylinder 301 is used for the inner surface of the upper mold 2 cavity and the lower mold 1 cavity The medium used for surface preheating has a certain effect of energy saving and emission reduction, and realizes ventilation with the inside of the cavity of the upper mold 2 and the lower mold 1, reducing the loss of the mold.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone familiar with the technical field within the technical scope disclosed in the present invention, according to the technical solutions of the present invention and its Any equivalent replacement or change of the inventive concept shall fall within the protection scope of the present invention.

Claims (10)

1. A precision injection mold for auto parts, comprising a lower mold (1) and an upper mold (2), characterized in that a lower pressure buffer assembly (3) is arranged between the lower mold (1) and the upper mold (2) ), utilizing air pressure and elastic force to buffer the impact force produced when the upper mold (2) is docked with the lower mold (1); The side end surface of the lower mold (1) is provided with a telescopic groove (4), and the inner end surface of the telescopic groove (4) is provided with a telescopic opening (5), and the telescopic opening (5) and the telescopic groove (4) The same group of one-way plugging components (6) is embedded in the connection, and the side end surface of the lower mold (1) is fixedly connected with a docking cover (7) corresponding to the position of the one-way plugging component (6), and the docking cover The other side of (7) is clamped with a hot air introduction pipe (8), and the other end of the hot air introduction pipe (8) is connected to the bottom of the outer surface of the downforce buffer assembly (3). 2. A precision injection mold for auto parts according to claim 1, characterized in that the lower pressure buffer assembly (3) includes a high-pressure cylinder (301), and one end of the high-pressure cylinder (301) is fixedly connected to the lower mold (1), the port at the other end of the high-pressure cylinder (301) is clamped with a sealing sleeve (302), and the sealing sleeve (302) is sleeved with a buffer shaft (303), and the buffer shaft The end of (303) is fixedly connected with a piston plate (304), and the opposite surface of the piston plate (304) and the sealing sliding sleeve (302) is fixedly connected by a buffer spring (305), and the buffer spring (305) is sleeved On the outer surface of the buffer shaft (303). 3. A precision injection mold for auto parts according to claim 2, characterized in that a docking cylinder (306) is arranged above the buffer shaft (303), and the top end of the docking cylinder (306) is fixedly connected to The bottom of the upper mold (2) is provided with a docking hole (13) at a position corresponding to the docking cylinder (306) at the bottom of the upper mold (2). 4. A precision injection mold for auto parts according to claim 1, characterized in that the one-way blocking assembly (6) includes a push plate (601), and the push plate (601) is embedded and connected In the telescopic groove (4), the inner end surface of the telescopic groove (4) is fixedly connected with an orientation shaft (602), and the orientation shaft (602) is slidably connected to the orientation hole opened on the side end surface of the push plate (601) Inside; The outer surface of the orientation shaft (602) is sleeved with a push spring (603), and one end of the push spring (603) is fixedly connected to the inner end face of the telescopic groove (4), and the push spring (603) The other end is fixedly connected with the near side of the push plate (601). 5. A precision injection mold for auto parts according to claim 3, characterized in that, the other end of the hot gas introduction pipe (8) is connected to the bottom of the outer surface of the high pressure cylinder (301), and the hot gas introduction pipe (8) is provided with a first valve. 6. A precision injection mold for auto parts according to claim 4, characterized in that a butt groove (11) is provided on the side end surface of the upper mold (2) corresponding to the butt hole (13), and the A plugging support assembly (12) is sleeved in the docking groove (11), and the plugging support assembly (12) plays a role of blocking the docking hole (13) and is used for receiving the buffer shaft (303). 7. A precision injection mold for auto parts according to claim 6, characterized in that, the plugging support assembly (12) includes a plugging support plate (121), and the plugging support plate (121) is socketed In the docking groove (11), a serial connection hole (122) is opened at a position corresponding to the docking hole (13) on the top of the blocking support plate (121). 8. A precision injection mold for auto parts according to claim 7, characterized in that, the end of the blocking support plate (121) away from the upper mold (2) is hinged with an adapter frame (123) through a pin shaft, The side of the other end of the adapter frame (123) is rotatably connected with an adapter shaft (124) through a bearing, and the outer surface of the adapter shaft (124) is rotatably connected with a handle (125) through a bearing, and the handle (125 ) is hinged with an adapter seat (126) by a spring pin, and the bottom of the adapter seat (126) is fixedly connected to the top of the upper mold (2). 9. A precision injection mold for auto parts according to claim 1, characterized in that, the top of the upper mold (2) is provided with a molten liquid injection port (10), and the molten liquid injection port (10) A hot gas release pipe (9) is clamped on the outer surface, and the other end of the hot gas release tube (9) is clamped on the bottom of the outer surface of the high-pressure cylinder (301), and a second valve is arranged on the hot gas release tube (9) , the one-way cut-off directions of the second valve and the first valve are opposite to each other. 10. A method of using the precision injection mold for auto parts according to any one of claims 1-9, characterized in that the method of use comprises the following steps: S1: After taking out the auto parts injection molded parts in the mold cavity, control the hydraulic pushing equipment to push the upper mold (2) to move in the direction of the lower mold (1) until the upper mold (2) and the lower mold (1) complete the docking control hydraulic pressure The push device stops working; S2: During the movement of the upper mold (2) towards the lower mold (1), before the upper mold (2) and the lower mold (1) are not docked, the buffer shaft (303) will enter the docking cylinder (306), and finally Abut against the bottom of the blocking support plate (121), the bottom of the blocking support plate (121) exerts a downward thrust on the buffer shaft (303) until the upper mold (2) and the lower mold (1) are docked, and the lower thrust Under the action of , the buffer shaft (303) slides in the sealing sleeve (302), and pushes the piston plate (304) to slide down in the high-pressure cylinder (301). During this process, on the one hand, the piston plate (304) will Squeeze and compress the hot gas inside the high-pressure cylinder (301) corresponding to the bottom of the piston plate (304). The hot gas is squeezed and compressed to produce a reactive thrust on the piston plate (304). On the other hand, the piston plate (304) will also pull The buffer spring (305) performs a stretching motion, the buffer spring (305) undergoes elastic deformation, and exerts a reactionary elastic force on the buffer shaft (303) through the piston disc (304); S3: After the upper mold (2) is docked with the lower mold (1), first open the first valve, and at this time, the compressed hot gas in the high-pressure cylinder (301) is introduced into the lower mold ( In the mold cavity of 1), the hot air flow in the mold cavity of the lower mold (1) flows upward into the mold cavity of the upper mold (2), and finally is discharged through the molten liquid injection port (10), and the hot air flow is used to cool the lower mold (1) ) and the inner surface of the upper mold (2) cavity are preheated, and after the preheating, the temperature of the inner surface of the lower mold (1) cavity will be slightly higher than the temperature of the inner surface of the upper mold (2), Thereby molten liquid flows into the process of lower mold (1) mold cavity by upper mold (2) die cavity through molten liquid injection port (10), molten liquid and upper mold (2) mold cavity inner surface and lower mold (1) mold The temperature of the inner surface of the cavity is close to; S4: Press the handle (125) firmly, the handle (125) will rotate with the adapter seat (126) as the rotation node, and will generate thrust to the blocking support plate (121), and the blocking support plate (121) will be in the docking groove (11) Sliding inside, the series connection hole (122) on the plugging support plate (121) after sliding is in a fully conducting state with the docking hole (13), and under the action of the return elastic force of the buffer spring (305), the piston disc (304) Slide upward in the high-pressure cylinder (301), close the first valve, open the second valve, and the hot gas emitted by the molten liquid in the cavity of the upper mold (2) and the cavity of the lower mold (1) passes through the hot gas release pipe (9 ) into the high-pressure cylinder (301).

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