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WO2018179975A1 - Dispositif de chauffage par conduction électrique - Google Patents

Dispositif de chauffage par conduction électrique Download PDF

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Publication number
WO2018179975A1
WO2018179975A1 PCT/JP2018/005534 JP2018005534W WO2018179975A1 WO 2018179975 A1 WO2018179975 A1 WO 2018179975A1 JP 2018005534 W JP2018005534 W JP 2018005534W WO 2018179975 A1 WO2018179975 A1 WO 2018179975A1
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WO
WIPO (PCT)
Prior art keywords
pipe material
metal pipe
metal body
temperature
power supply
Prior art date
Application number
PCT/JP2018/005534
Other languages
English (en)
Japanese (ja)
Inventor
章博 井手
正之 石塚
雅之 雑賀
紀条 上野
公宏 野際
Original Assignee
住友重機械工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 住友重機械工業株式会社 filed Critical 住友重機械工業株式会社
Publication of WO2018179975A1 publication Critical patent/WO2018179975A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/16—Heating or cooling
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • B21D26/047—Mould construction

Definitions

  • One embodiment of the present invention relates to an electric heating apparatus.
  • Patent Document 1 There is known an energization heating device that energizes a metal body to heat the metal body to a target temperature.
  • a metal pipe material is disposed between molds, the metal pipe material is energized and heated by an energization heating device, and a high-pressure gas is supplied into the heated metal pipe material to be expanded.
  • a molding apparatus for performing the above is disclosed.
  • constant current control is performed with the current command value in the metal pipe material as a constant value until the metal pipe material reaches a target temperature.
  • the constant current control is performed in the case of heating the metal pipe material having a large time constant of temperature change, the temperature of the metal pipe material may exceed the target temperature (overshoot). Further, if the temperature of the metal pipe material rises too much, the metal pipe material may be softened and deformed, and may come into contact with the mold during energization. As a result, current flows through the mold, and the mold may be deformed at a high temperature.
  • an object of one embodiment of the present invention is to provide an electric heating device that can suppress a metal body including a metal pipe material from being heated beyond a target temperature.
  • An energization heating apparatus is an apparatus that energizes a metal body to heat the metal body to a target temperature, and includes a power supply unit that supplies power to the metal body, and a control that controls the power supply unit.
  • the control unit is provided in the metal body between the start of power supply to the metal body and the switching timing set before the temperature of the metal body reaches the target temperature.
  • the power supply unit is controlled so that the current command value is set to a predetermined current value set in advance, and after the switching timing, the power supply unit is controlled so as to decrease the current command value from the predetermined current value.
  • the current command value is set to a predetermined value as high as possible between the start of the supply of electric power to the metal body and the switching timing set before the temperature of the metal body reaches the target temperature.
  • the current command value is decreased and heating is performed so that the temperature of the metal body gradually increases, so that the temperature of the metal body does not exceed the target temperature. Therefore, it can suppress that a metal body heats exceeding target temperature.
  • the energization heating device includes a voltage measurement unit that measures an actual voltage value in the metal body, and the control unit responds to the actual voltage value measured by the voltage measurement unit after the switching timing.
  • the power supply unit may be controlled so as to have a predetermined value. According to this, it is possible to set an appropriate current command value while estimating the temperature of the metal body based on the actual voltage value using the fact that the actual voltage value in the metal body corresponds to the temperature of the metal body. it can. Therefore, the current value in the metal body can be set to an appropriate value.
  • control unit may control the power supply unit so that the voltage command value in the metal body is set to a predetermined voltage value set in advance after the switching timing.
  • the current value in the metal body can be set to an appropriate value according to the target temperature by executing the constant voltage control in which the voltage command value is set to a predetermined voltage value corresponding to the target temperature.
  • the energization heating device includes a voltage measurement unit that measures an actual voltage value in the metal body, and the switching timing is a margin voltage value in which the actual voltage value measured by the voltage measurement unit is set in advance from a predetermined voltage value.
  • the timing may be set to a voltage value that is as low as possible. According to this, the timing which switches an electric power supply part to constant voltage control can be suitably set using that the actual voltage value in a metal body respond
  • the energization heating apparatus includes a temperature measurement unit that measures the actual temperature of the metal body, and the switching timing is a temperature at which the actual temperature measured by the temperature measurement unit is lower than the target temperature by a preset margin temperature. May be set at the timing. According to this, the timing at which the current command value starts to decrease from the predetermined current value can be set particularly suitably by directly measuring the actual temperature of the metal body.
  • an energization heating apparatus capable of suppressing the metal body from being heated beyond the target temperature.
  • FIG. 1 is a schematic configuration diagram showing an energization heating apparatus according to an embodiment of the present invention.
  • 2A and 2B are enlarged views of the periphery of the electrode, in which FIG. 2A shows a state where the electrode holds the metal pipe material, FIG. 2B shows a state where the seal member is pressed against the electrode, and FIG. It is a front view of an electrode.
  • FIG. 3 is a graph showing an example of temporal changes in the current command value and the actual voltage value when the metal pipe material is heated by energization.
  • FIG. 1 is a schematic configuration diagram of a molding apparatus as an electric heating apparatus.
  • a molding apparatus 10 for molding a metal pipe moves a blow molding die (mold) 13 including an upper die 12 and a lower die 11 and at least one of the upper die 12 and the lower die 11.
  • Drive mechanism 80, pipe holding mechanism 30 holding metal pipe material 14 disposed between upper mold 12 and lower mold 11, and metal pipe material 14 held by pipe holding mechanism 30 are energized.
  • a heating mechanism 50 Heated by a heating mechanism 50, a gas supply unit 60 for supplying high-pressure gas (gas) into the heated metal pipe material 14 held between the upper mold 12 and the lower mold 11, and held by the pipe holding mechanism 30
  • a pair of gas supply mechanisms 40 and 40 for supplying the gas from the gas supply unit 60 into the metal pipe material 14 and a water circulation mechanism 72 for forcibly cooling the blow mold 13 with water.
  • Driving Driving mechanism 80, driving of the pipe holding mechanism 30 is configured to include the driving of the heating mechanism 50, and a control unit 70 for controlling each of the gas supply of the gas supply unit 60, a.
  • the lower mold 11 which is one of the blow molding dies 13 is fixed to the base 15.
  • the lower mold 11 is composed of a large steel block, and includes, for example, a rectangular cavity (concave portion) 16 on the upper surface thereof.
  • a cooling water passage 19 is formed in the lower mold 11 and is provided with a thermocouple (temperature measuring unit) 21 inserted from below at a substantially central position.
  • the thermocouple 21 is supported by a spring 22 so as to be movable up and down.
  • the thermocouple 21 contacts the side surface of the metal pipe material 14 held by the pipe holding mechanism 30 and measures the actual temperature of the metal pipe material 14.
  • the thermocouple 21 outputs temperature information regarding the measured actual temperature of the metal pipe material 14 to the control unit 70 according to (A) shown in FIG.
  • a space 11a is provided in the vicinity of the left and right ends (left and right ends in FIG. 1) of the lower mold 11, and electrodes 17 and 18 (lower portions), which are movable parts of the pipe holding mechanism 30, described later, are provided in the space 11a.
  • Side electrodes) and the like are arranged so as to be movable up and down. Then, by placing the metal pipe material 14 on the lower electrodes 17 and 18, the lower electrodes 17 and 18 are in contact with the metal pipe material 14 disposed between the upper mold 12 and the lower mold 11. To do. Thus, the lower electrodes 17 and 18 are electrically connected to the metal pipe material 14.
  • An insulating material 91 for preventing energization is provided between the lower mold 11 and the lower electrode 17 and under the lower electrode 17, and between the lower mold 11 and the lower electrode 18 and under the lower electrode 18. Each is provided. Each insulating material 91 is fixed to an advance / retreat rod 95 which is a movable portion of an actuator (not shown) constituting the pipe holding mechanism 30. This actuator is for moving the lower electrodes 17, 18 and the like up and down, and the fixed portion of the actuator is held on the base 15 side together with the lower mold 11.
  • the upper mold 12 which is the other of the blow molding dies 13, is fixed to a slide 81 (described later) constituting the drive mechanism 80.
  • the upper mold 12 is composed of a large steel block, and has a cooling water passage 25 formed therein, and is provided with, for example, a rectangular cavity (recess) 24 on the lower surface thereof.
  • the cavity 24 is provided at a position facing the cavity 16 of the lower mold 11.
  • a space 12a is provided in the vicinity of the left and right ends (left and right ends in FIG. 1) of the upper mold 12 in the same manner as the lower mold 11, and a movable portion of the pipe holding mechanism 30 will be described later in the space 12a.
  • Electrodes 17 and 18 (upper electrodes) and the like are arranged so as to be movable up and down. Then, in a state where the metal pipe material 14 is placed on the lower electrodes 17 and 18, the upper electrodes 17 and 18 are arranged between the upper mold 12 and the lower mold 11 by moving downward. Contact the metal pipe material 14. Thereby, the upper electrodes 17 and 18 are electrically connected to the metal pipe material 14.
  • Insulating materials 101 for preventing energization are provided between the upper mold 12 and the upper electrode 17 and above the upper electrode 17, and between the upper mold 12 and the upper electrode 18 and above the upper electrode 18, respectively. Yes.
  • Each insulating material 101 is fixed to an advance / retreat rod 96 which is a movable portion of an actuator constituting the pipe holding mechanism 30. This actuator is for moving the upper electrodes 17, 18 and the like up and down, and the fixed portion of the actuator is held on the slide 81 side of the drive mechanism 80 together with the upper mold 12.
  • a semicircular arc-shaped groove 18a corresponding to the outer peripheral surface of the metal pipe material 14 is formed on each of the surfaces where the electrodes 18, 18 face each other (see FIG. 2).
  • the metal pipe material 14 can be placed so as to fit into the concave groove 18a.
  • a semicircular arc-shaped groove corresponding to the outer peripheral surface of the metal pipe material 14 is formed on the exposed surface where the insulating materials 91 and 101 face each other, like the groove 18a.
  • a tapered concave surface 18b is formed on the front surface of the electrode 18 (the surface in the outer direction of the mold).
  • the outer periphery of the right end portion of the metal pipe material 14 can be surrounded so as to be in close contact over the entire circumference. ing.
  • a semicircular arc-shaped groove 17a corresponding to the outer peripheral surface of the metal pipe material 14 is formed on each of the surfaces where the electrodes 17 and 17 face each other (see FIG. 2).
  • the metal pipe material 14 can be placed so as to fit into the concave groove 17a.
  • a semicircular arc-shaped groove corresponding to the outer peripheral surface of the metal pipe material 14 is formed on the exposed surface where the insulating materials 91 and 101 face each other, like the groove 18a.
  • a tapered concave surface 17b is formed on the front surface of the electrode 17 (surface in the outer direction of the mold). Therefore, when the metal pipe material 14 is sandwiched from above and below by the left portion of the pipe holding mechanism 30, the outer periphery of the left end portion of the metal pipe material 14 can be surrounded so as to be in close contact over the entire circumference. ing.
  • the drive mechanism 80 includes a slide 81 that moves the upper mold 12 so that the upper mold 12 and the lower mold 11 are aligned with each other, and a shaft 82 that generates a driving force for moving the slide 81. And a connecting rod 83 for transmitting the driving force generated by the shaft 82 to the slide 81.
  • the shaft 82 extends in the left-right direction above the slide 81 and is rotatably supported.
  • An eccentric crank 82a that protrudes from the left and right ends and extends in the left-right direction at a position away from the axis. Have.
  • the eccentric crank 82 a and a rotating shaft 81 a provided in the upper part of the slide 81 and extending in the left-right direction are connected by a connecting rod 83.
  • the height of the eccentric crank 82a is changed by controlling the rotation of the shaft 82 by the control unit 70, and the change in the position of the eccentric crank 82a is transmitted to the slide 81 via the connecting rod 83.
  • the vertical movement of the slide 81 can be controlled.
  • the swinging (rotating motion) of the connecting rod 83 that occurs when the position change of the eccentric crank 82a is transmitted to the slide 81 is absorbed by the rotating shaft 81a.
  • the shaft 82 rotates or stops according to the driving of a motor or the like controlled by the control unit 70, for example.
  • the heating mechanism 50 is a mechanism for energizing the metal pipe material 14 to heat the metal pipe material 14 to a target temperature.
  • the heating mechanism 50 includes a power supply unit 55, a bus bar 52 that electrically connects the power supply unit 55 and the electrodes 17 and 18, and a voltmeter 53 as a voltage measurement unit that measures a voltage between the electrodes 17 and 18. .
  • the power supply unit 55 includes a direct current power source and a switch, and can energize the metal pipe material 14 via the bus bar 52 and the electrodes 17 and 18 in a state where the electrodes 17 and 18 are electrically connected to the metal pipe material 14. Has been.
  • the bus bar 52 is connected to the lower electrodes 17 and 18, and the voltmeter 53 is connected to a position near the lower electrode 17 of the bus bar 52 and a position near the lower electrode 18 of the bus bar 52. It is connected to the.
  • the voltage value measured by the voltmeter 53 is input to the control unit 70 by (B) shown in FIG.
  • the direct current output from the power supply unit 55 is transmitted by the bus bar 52 and input to the electrode 17.
  • the direct current passes through the metal pipe material 14 and is input to the electrode 18.
  • the direct current is transmitted by the bus bar 52 and input to the power supply unit 55.
  • Each of the pair of gas supply mechanisms 40 includes a cylinder unit 42, a cylinder rod 43 that moves forward and backward in accordance with the operation of the cylinder unit 42, and a seal member 44 that is coupled to the tip of the cylinder rod 43 on the pipe holding mechanism 30 side.
  • the cylinder unit 42 is mounted and fixed on the block 41.
  • a tapered surface 45 is formed at the tip of the seal member 44 so as to be tapered, and is configured to fit the tapered concave surfaces 17b, 18b of the electrodes 17, 18 (see FIG. 2).
  • the seal member 44 extends from the cylinder unit 42 toward the tip, and as shown in detail in FIGS. 2A and 2B, a gas passage through which the high-pressure gas supplied from the gas supply unit 60 flows. 46 is provided.
  • the gas supply unit 60 includes a gas source 61, an accumulator 62 that stores the gas supplied by the gas source 61, a first tube 63 that extends from the accumulator 62 to the cylinder unit 42 of the gas supply mechanism 40, A pressure control valve 64 and a switching valve 65 provided in one tube 63; a second tube 67 extending from the accumulator 62 to a gas passage 46 formed in the seal member 44; The pressure control valve 68 and the check valve 69 are provided.
  • the pressure control valve 64 serves to supply the cylinder unit 42 with a gas having an operating pressure adapted to the pressing force of the seal member 44 against the metal pipe material 14.
  • the check valve 69 serves to prevent the high pressure gas from flowing back in the second tube 67.
  • the pressure control valve 68 provided in the second tube 67 serves to supply a gas having an operating pressure for expanding the metal pipe material 14 to the gas passage 46 of the seal member 44 under the control of the control unit 70. Fulfill.
  • the control unit 70 can supply a gas having a desired operating pressure into the metal pipe material 14 by controlling the pressure control valve 68 of the gas supply unit 60. Moreover, the control part 70 acquires temperature information from the thermocouple 21 by information being transmitted from (A) shown in FIG. 1, and controls the drive mechanism 80, the power supply part 55, and the like.
  • the water circulation mechanism 72 includes a water tank 73 that stores water, a water pump 74 that pumps up and pressurizes the water stored in the water tank 73 and sends the water to the cooling water passage 19 of the lower mold 11 and the cooling water passage 25 of the upper mold 12. It consists of a pipe 75. Although omitted, a cooling tower for lowering the water temperature and a filter for purifying water may be interposed in the pipe 75.
  • a method for forming a metal pipe using the forming apparatus 10 will be described. First, a cylindrical metal pipe material 14 of a hardenable steel type is prepared.
  • the metal pipe material 14 is placed (input) on the electrodes 17 and 18 provided on the lower mold 11 side using, for example, a robot arm or the like. Since the grooves 17a and 18a are formed in the electrodes 17 and 18, the metal pipe material 14 is positioned by the grooves 17a and 18a.
  • control unit 70 controls the drive mechanism 80 and the pipe holding mechanism 30 to cause the pipe holding mechanism 30 to hold the metal pipe material 14. Specifically, the upper die 12 and the upper electrodes 17 and 18 held on the slide 81 side by the driving mechanism 80 move to the lower die 11 side, and the upper electrode 17 and the upper electrode 17 included in the pipe holding mechanism 30 are moved. By actuating an actuator that allows the 18 and the like and the lower electrodes 17 and 18 to move forward and backward, the vicinity of both ends of the metal pipe material 14 is sandwiched by the pipe holding mechanism 30 from above and below.
  • the end of the metal pipe material 14 on the electrode 18 side has a groove 18 a and a taper concave surface 18 b of the electrode 18 in the extending direction of the metal pipe material 14. It protrudes to the seal member 44 side from the boundary. Similarly, the end of the metal pipe material 14 on the electrode 17 side protrudes more toward the seal member 44 than the boundary between the concave groove 17a and the tapered concave surface 17b of the electrode 17 in the extending direction of the metal pipe material 14.
  • the lower surfaces of the upper electrodes 17 and 18 and the upper surfaces of the lower electrodes 17 and 18 are in contact with each other.
  • the configuration is not limited to the configuration in which the metal pipe material 14 is in close contact with the entire periphery of the both ends, and a configuration in which the electrodes 17 and 18 are in contact with part of the metal pipe material 14 in the circumferential direction may be employed.
  • control unit 70 heats the metal pipe material 14 by controlling the heating mechanism 50. Specifically, the control unit 70 controls the power supply unit 55 of the heating mechanism 50 to supply power. Then, the electric power transmitted to the lower electrodes 17 and 18 via the bus bar 52 is supplied to the upper electrodes 17 and 18 and the metal pipe material 14 sandwiching the metal pipe material 14 and exists in the metal pipe material 14. Due to the resistance, the metal pipe material 14 itself generates heat due to Joule heat.
  • FIG. 3 is a graph showing an example of temporal changes in the current command value and the actual voltage value when the metal pipe material is heated by energization.
  • time is shown on the horizontal axis
  • the current command value Ic, actual voltage value Vr, and target voltage value (predetermined voltage value) Vt in the metal pipe material 14 are shown on the vertical axis.
  • the actual voltage value Vr in the metal pipe material 14 corresponds to the temperature of the metal pipe material 14
  • the target voltage value Vt corresponds to the target temperature of the metal pipe material 14.
  • This heating method includes the following first step and second step.
  • the control unit 70 switches the switching timing set before the temperature of the metal pipe material 14 reaches the target temperature from the start time T0 of the supply of power to the metal pipe material 14 by the power supply unit 55.
  • the power supply unit 55 is controlled so that the current command value Ic in the metal pipe material 14 is set to a predetermined current value Id set in advance (constant current control).
  • the predetermined current value Id is the rated maximum current value Imax of the power supply unit 55. Thereby, the temperature of the metal pipe material 14 starts to be heated.
  • the switching timing T1 is a timing at which the actual voltage value Vr measured by the voltmeter 53 reaches a voltage value lower than the target voltage value Vt by a preset margin voltage value ⁇ V.
  • the margin voltage value ⁇ V may be set, for example, in the range of 10% to 20% of the target voltage value Vt.
  • the control unit 70 controls the power supply unit 55 so as to decrease the current command value Ic from the predetermined current value Id. More specifically, the control unit 70 controls the power supply unit 55 to set the current command value Ic to a current value corresponding to the actual voltage value Vr measured by the voltmeter 53 after the switching timing T1. .
  • a suitable current command value Ic corresponding to the actual voltage value Vr may be stored in advance by the control unit 70 as, for example, a current-voltage map, and the control unit 70 calculates each time based on a predetermined calculation formula. May be. Thereby, the metal pipe material 14 is heated so that the temperature rises gradually.
  • the control unit 70 may continue the control of the power supply unit 55 at least until the heating completion timing T2 at which the actual voltage value Vr reaches the target voltage value Vt after the switching timing T1.
  • the blow mold 13 is closed with respect to the heated metal pipe material 14 by the control of the drive mechanism 80 by the control unit 70.
  • the cavity 16 of the lower mold 11 and the cavity 24 of the upper mold 12 are combined, and the metal pipe material 14 is disposed and sealed in the cavity portion between the lower mold 11 and the upper mold 12.
  • the cylinder unit 42 of the gas supply mechanism 40 is operated to advance the seal member 44 to seal both ends of the metal pipe material 14.
  • the seal member 44 is pressed against the end portion of the metal pipe material 14 on the electrode 18 side, so that the boundary between the concave groove 18a and the tapered concave surface 18b of the electrode 18 is exceeded.
  • a portion protruding toward the seal member 44 is deformed in a funnel shape so as to follow the tapered concave surface 18b.
  • the gas supplied into the metal pipe material 14 is thermally expanded.
  • the supplied gas is compressed air, and the metal pipe material 14 at 950 ° C. can be easily expanded by the thermally expanded compressed air.
  • austenite transforms to martensite (hereinafter, austenite transforms to martensite is referred to as martensite transformation).
  • cooling may be performed by supplying a cooling medium into the cavity 24, for example, instead of or in addition to mold cooling.
  • the metal pipe material 14 is brought into contact with the mold (upper mold 12 and lower mold 11) until the temperature at which martensitic transformation begins, and then the mold is opened and the cooling medium (cooling gas) is used as the metal pipe material.
  • the martensitic transformation may be generated by spraying on 14.
  • the metal pipe material 14 is blow-molded, cooled, and then opened to obtain a metal pipe having a substantially rectangular cylindrical main body, for example.
  • the constant current control is performed to set the current command value Ic to the rated maximum current value Imax, thereby heating the metal pipe material 14 to a certain degree in a short time.
  • the current command value Ic is decreased to heat the metal pipe material 14 so that the temperature gradually rises, so that the temperature of the metal pipe material 14 does not exceed the target temperature. Therefore, it can suppress that the metal pipe material 14 is heated exceeding target temperature.
  • the forming apparatus 10 as the electric heating apparatus includes a voltmeter 53 that measures the actual voltage value Vr in the metal pipe material 14, and the control unit 70 converts the current command value Ic into a voltmeter after the switching timing T1.
  • the power supply unit 55 is controlled so as to have a value corresponding to the actual voltage value Vr measured by 53.
  • the value Ic can be set. Therefore, the current value in the metal pipe material 14 can be set to an appropriate value.
  • the switching timing T1 is set to a timing at which the actual voltage value Vr measured by the voltmeter 53 becomes a voltage value lower than the target voltage value Vt by a preset margin voltage value ⁇ V. Thereby, the switching timing T1 can be suitably set by utilizing the fact that the actual voltage value Vr in the metal pipe material 14 corresponds to the temperature of the metal pipe material 14.
  • the predetermined current value Id is not limited to the rated maximum current value Imax of the power supply unit 55, and may be a current value lower than the rated maximum current value Imax, for example.
  • the control unit 70 may control the power supply unit 55 so that the voltage command value in the metal pipe material 14 is set to a preset target voltage value Vt after the switching timing T1. .
  • the control of the power supply unit 55 is switched from the current control to the voltage control at the switching timing T1, and the constant voltage control is performed to set the voltage command value to the target voltage value Vt corresponding to the target temperature.
  • the current value in the pipe material 14 can be set to an appropriate value according to the target temperature.
  • the switching timing T1 may be set to a timing at which the actual voltage value Vr measured by the voltmeter 53 becomes a voltage value lower than the target voltage value Vt by a preset margin voltage value ⁇ V.
  • the margin voltage value ⁇ V may be set, for example, in the range of 10% to 20% of the target voltage value Vt. According to this, it is possible to suitably set the timing for switching the power supply unit 55 to the constant voltage control by utilizing the fact that the actual voltage value Vr in the metal pipe material 14 corresponds to the temperature of the metal pipe material 14. it can.
  • the switching timing T1 is a timing at which the actual temperature of the metal pipe material 14 measured by the thermocouple 21 is lower than the target temperature by a preset margin temperature. It may be set.
  • the margin temperature may be set, for example, in a range of 10% to 20% of the target temperature. According to this, the timing at which the current command value Ic starts to decrease from the predetermined current value Id can be set particularly suitably by directly measuring the actual temperature of the metal pipe material 14.
  • the temperature measuring unit for measuring the actual temperature of the metal pipe material 14 is not limited to the thermocouple 21 and any configuration can be adopted.
  • a thermographic camera that obtains a heat distribution by analyzing infrared rays emitted from an object may be used.
  • molding object is made into the metal pipe material 14, it is not limited to the metal pipe material 14, It can apply also to a metal rod-shaped body, a metal plate-shaped body, etc. It can be applied to a metal body that extends to some extent.
  • a rod-like or plate-like metal body is used, a configuration in which an electrode is brought into contact with the end face of the metal body can also be mentioned.
  • the forming apparatus can also be a forging apparatus that performs energization heating without supplying gas.
  • SYMBOLS 10 Molding apparatus (electric current heating apparatus), 14 ... Metal pipe material, 21 ... Thermocouple (temperature measurement part), 53 ... Voltmeter (voltage measurement part), 55 ... Electric power supply part, 70 ... Control part.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Control Of Resistance Heating (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)

Abstract

Ce dispositif de chauffage par conduction électrique conduit l'électricité vers un corps métallique et chauffe le corps métallique à une température cible. Le dispositif de chauffage par conduction électrique comprend une unité d'alimentation électrique permettant de fournir de l'énergie électrique au corps métallique, et une unité de commande permettant de commander l'unité d'alimentation électrique. L'unité de commande : commande l'unité d'alimentation électrique de telle sorte que, pendant une période allant de l'instant où l'alimentation en énergie électrique vers le corps métallique est démarrée à un instant de commutation réglé avant que la température du corps métallique n'atteigne la température cible, une valeur de commande de courant dans le corps métallique atteint une valeur de courant prescrite définie à l'avance; et commande l'unité d'alimentation électrique de telle sorte que, après l'instant de commutation, la valeur de commande actuelle est réduite à partir de la valeur de courant prescrite.
PCT/JP2018/005534 2017-03-29 2018-02-16 Dispositif de chauffage par conduction électrique WO2018179975A1 (fr)

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JP2017065378A JP2020095775A (ja) 2017-03-29 2017-03-29 通電加熱装置
JP2017-065378 2017-03-29

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WO2018179975A1 true WO2018179975A1 (fr) 2018-10-04

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KR20240157634A (ko) * 2022-03-02 2024-11-01 스미도모쥬기가이고교 가부시키가이샤 통전가열장치, 성형장치, 및 통전가열방법

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JPS5014375B1 (fr) * 1970-04-23 1975-05-27
JPS63166927A (ja) * 1986-12-26 1988-07-11 Toshiba Corp 金属材の通電加熱方法
JPH07105261B2 (ja) * 1987-01-20 1995-11-13 株式会社東芝 金属材の製造方法
JPH0822758B2 (ja) * 1987-07-06 1996-03-06 オーエンス・コーニング フアイバーグラス コーポレーシヨン ブツシング均衡制御器
JP2004055266A (ja) * 2002-07-18 2004-02-19 Nippon Steel Corp 金属板の通電加熱方法
JP2009042655A (ja) * 2007-08-10 2009-02-26 Ricoh Co Ltd 被加熱体の温度制御装置、定着装置、定着方法、画像形成装置及び画像形成方法
WO2014034375A1 (fr) * 2012-08-28 2014-03-06 日本発條株式会社 Procédé permettant de fabriquer un stabilisateur, et dispositif chauffant
JP2017014560A (ja) * 2015-06-30 2017-01-19 Ntn株式会社 機械部品製造装置

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5014375B1 (fr) * 1970-04-23 1975-05-27
JPS63166927A (ja) * 1986-12-26 1988-07-11 Toshiba Corp 金属材の通電加熱方法
JPH07105261B2 (ja) * 1987-01-20 1995-11-13 株式会社東芝 金属材の製造方法
JPH0822758B2 (ja) * 1987-07-06 1996-03-06 オーエンス・コーニング フアイバーグラス コーポレーシヨン ブツシング均衡制御器
JP2004055266A (ja) * 2002-07-18 2004-02-19 Nippon Steel Corp 金属板の通電加熱方法
JP2009042655A (ja) * 2007-08-10 2009-02-26 Ricoh Co Ltd 被加熱体の温度制御装置、定着装置、定着方法、画像形成装置及び画像形成方法
WO2014034375A1 (fr) * 2012-08-28 2014-03-06 日本発條株式会社 Procédé permettant de fabriquer un stabilisateur, et dispositif chauffant
JP2017014560A (ja) * 2015-06-30 2017-01-19 Ntn株式会社 機械部品製造装置

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