JP7183310B2 - molding equipment - Google Patents

Description

The present invention relates to molding equipment.

2. Description of the Related Art Conventionally, there has been known a forming apparatus that heats a metal pipe material and supplies gas into the metal pipe material to form the metal pipe. As such a molding apparatus, for example, Patent Document 1 discloses a pair of molds, an electrode electrically connectable to a metal pipe material disposed between the pair of molds, and an electrode electrically connected to the metal pipe material. and a power supply capable of energizing the metal pipe material via the electrodes while connected to the metal pipe material. This forming apparatus heats the metal pipe material by Joule heat generated by energizing the metal pipe material.

JP 2012-654 A

In the molding apparatus described above, when the metal pipe material is energized, the electrodes are also heated by the Joule heat generated in the electrodes themselves. The electrodes are also heated by heat conduction from the heated metal pipe material.

By the way, when the electrodes are heated, the following problems arise. That is, when the electrodes are heated, the resistance value of the electrodes increases and the current value flowing through the metal pipe material decreases, so that the heating efficiency of the metal pipe material deteriorates. Moreover, since the resistance value of the electrode fluctuates according to the temperature change of the electrode, it becomes difficult to control the current supply to the metal pipe material. Further, the electrode is generally provided with an insulating material for electrically insulating it from the mold, and the deterioration of the insulating material is accelerated when the electrode is heated. Therefore, it is required to suppress the temperature rise of the electrodes due to the heating of the electrodes.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a molding apparatus capable of suppressing the temperature rise of an electrode.

The molding apparatus of the present invention comprises a pair of molds, electrodes arranged between the pair of molds and electrically connectable to a metal pipe material, and a state in which the electrodes are electrically connected to the metal pipe material. In the above, a power supply unit capable of supplying electricity to the metal pipe material through the electrode is electrically connected between the power supply unit and the electrode, and is energized by the power supply unit to absorb heat from the electrode side and supply power and an energizing heat-dissipating part for dissipating heat to the part side.

In this forming apparatus, the metal pipe material is heated by Joule heat generated by energizing the metal pipe material through the electrodes from the power supply unit. At this time, electricity is also supplied to the heat radiation part electrically connected between the power supply part and the electrode. The energizing and radiating portion absorbs heat from the electrode side when energized. Therefore, the temperature rise of the electrodes can be suppressed.

In the molding apparatus of the present invention, the power supply section has a power supply that outputs power, a busbar that transmits the power output by the power supply, and a cooling section that cools the busbar, and the current-radiating section includes the busbar and the cooling section. It may be electrically connected between the electrodes. In this case, when the current-dissipating section is energized, it dissipates heat to the power supply section side, so that the bus bar provided on the power supply section side is heated. However, in this forming apparatus, the busbars are cooled by the cooling section. Therefore, it is possible to suppress the temperature rise of the bus bar.

In the molding apparatus of the present invention, the energizing heat radiating part may be in contact with the electrode. In this case, heat can be absorbed directly from the electrode by energizing the current-dissipating portion. Therefore, the temperature rise of the electrodes can be further suppressed.

In the molding apparatus of the present invention, a plurality of energizing/radiating parts may be electrically connected in parallel between the power supply part and the electrode. In this case, the amount of heat that can be absorbed from the electrode side can be increased by energizing the power supply unit. Therefore, the temperature rise of the electrodes can be further suppressed.

ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the shaping|molding apparatus which can suppress the temperature rise of an electrode.

1 is a schematic configuration diagram of a molding apparatus; FIG. It is an enlarged view of the periphery of the electrode, (a) is a view showing the state in which the electrode holds the metal pipe material, (b) is a view showing the state in which the sealing member is pressed against the electrode, and (c) is a front view of the electrode. is. It is a schematic plan view showing the arrangement of the heating mechanism of the molding apparatus.

A preferred embodiment of a molding apparatus according to the present invention will be described below with reference to the drawings. In each figure, the same or corresponding parts are denoted by the same reference numerals, and redundant explanations are omitted.

<Configuration of molding device>
FIG. 1 is a schematic configuration diagram of a molding apparatus. As shown in FIG. 1, a molding apparatus 10 for molding a metal pipe moves a blow molding mold (mold) 13 consisting of an upper mold 12 and a lower mold 11, and at least one of the upper mold 12 and the lower mold 11. a driving mechanism 80 that allows the metal pipe material 14 to be driven, a pipe holding mechanism 30 that holds the metal pipe material 14 arranged between the upper mold 12 and the lower mold 11, and the metal pipe material 14 held by the pipe holding mechanism 30 is energized. A heating mechanism 50 for heating, 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, 40 for supplying gas from the gas supply unit 60 into the metal pipe material 14 that has been formed, and a water circulation mechanism 72 that forcibly cools the blow molding mold 13 with water. A controller 70 controls the drive of the drive mechanism 80, the pipe holding mechanism 30, the heating mechanism 50, and the gas supply of the gas supply unit 60, respectively.

A lower mold 11 , which is one of the blow molding molds 13 , is fixed to a base 15 . The lower mold 11 is composed of a large steel block and has, for example, a rectangular cavity (recess) 16 on its upper surface. A cooling water passage 19 is formed in the lower mold 11, and a thermocouple 21 is inserted from below in the approximate center. The thermocouple 21 is supported by a spring 22 so as to be vertically movable.

Furthermore, a space 11a is provided in the vicinity of the left and right ends (left and right ends in FIG. 1) of the lower die 11, and electrodes 17 and 18 (lower side electrodes) and the like are arranged so as to be vertically movable forward and backward. By placing the metal pipe material 14 on the lower electrodes 17 and 18, the lower electrodes 17 and 18 come into contact with the metal pipe material 14 arranged between the upper mold 12 and the lower mold 11. do. The lower electrodes 17 and 18 are thereby electrically connected to the metal pipe material 14 .

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, there is an insulating material 91 for preventing electric conduction. are provided respectively. Each insulating material 91 is fixed to a forward/backward rod 95 that is a movable portion of an actuator (not shown) that constitutes the pipe holding mechanism 30 . This actuator is for moving the lower electrodes 17 and 18 up and down, and the fixed portion of the actuator is held on the base 15 side together with the lower die 11 .

The upper mold 12 , which is the other of the blow molding mold 13 , is fixed to a slide 81 that constitutes the driving mechanism 80 and will be described later. The upper mold 12 is composed of a large steel block, has a cooling water passage 25 formed therein, and has, for example, a rectangular cavity (recess) 24 on its lower surface. This 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, similarly to the lower mold 11, and the space 12a contains a movable portion of the pipe holding mechanism 30, which will be described later. Electrodes 17 and 18 (upper electrodes) and the like are arranged so as to be vertically movable forward and backward. With the metal pipe material 14 placed on the lower electrodes 17 and 18, the upper electrodes 17 and 18 move downward to be arranged between the upper mold 12 and the lower mold 11. contact the metal pipe material 14; The upper electrodes 17 and 18 are thereby electrically connected to the metal pipe material 14 .

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, an insulating material 101 for preventing electric conduction is provided, respectively. there is Each insulating material 101 is fixed to an advancing/retreating rod 96 that is a movable portion of an actuator that constitutes the pipe holding mechanism 30 . This actuator is for moving the upper electrodes 17 , 18 and the like up and down, and the fixed part of the actuator is held on the slide 81 side of the drive mechanism 80 together with the upper die 12 .

In the right portion of the pipe holding mechanism 30, the surfaces of the electrodes 18, 18 facing each other are formed with semicircular concave grooves 18a corresponding to the outer peripheral surface of the metal pipe material 14 (see FIG. 2). , the metal pipe material 14 can be placed so as to fit into the portion of the groove 18a. In the right portion of the pipe holding mechanism 30, on the exposed surfaces where the insulating members 91 and 101 face each other, a semicircular concave groove corresponding to the outer peripheral surface of the metal pipe material 14 is formed in the same manner as the concave groove 18a. ing. A tapered recessed surface 18b is formed on the front surface of the electrode 18 (the surface facing the outer side of the mold) so that the periphery of the electrode 18 is tapered and recessed toward the recessed groove 18a. Therefore, when the metal pipe material 14 is vertically sandwiched by the right side portion of the pipe holding mechanism 30, the outer periphery of the right end portion of the metal pipe material 14 can be surrounded so as to be in close contact with the entire circumference. ing.

In the left portion of the pipe holding mechanism 30, the surfaces of the electrodes 17, 17 facing each other are formed with semicircular concave grooves 17a corresponding to the outer peripheral surface of the metal pipe material 14 (see FIG. 2). , the metal pipe material 14 can be placed so as to fit into the portion of the groove 17a. In the left portion of the pipe holding mechanism 30, the exposed surfaces of the insulating members 91 and 101 facing each other are formed with a semicircular concave groove corresponding to the outer peripheral surface of the metal pipe material 14 in the same manner as the concave groove 18a. ing. A tapered concave surface 17b is formed on the front surface of the electrode 17 (the surface facing the outside of the mold), the circumference of which is tapered and recessed toward the concave groove 17a. Therefore, when the metal pipe material 14 is vertically sandwiched 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 tightly surrounded over the entire circumference. ing.

As shown in FIG. 1, the drive mechanism 80 includes a slide 81 that moves the upper die 12 so that the upper die 12 and the lower die 11 are put together, 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, and has eccentric cranks 82a projecting and extending from the left and right ends at positions separated from the center thereof. . A connecting rod 83 connects the eccentric crank 82 a and a rotating shaft 81 a provided on the upper portion of the slide 81 and extending in the left-right direction. In the drive mechanism 80, the rotation of the shaft 82 is controlled by the control unit 70 to change the vertical height of the eccentric crank 82a, and the change in the position of the eccentric crank 82a is transmitted to the slide 81 via the connecting rod 83. Thereby, the vertical movement of the slide 81 can be controlled. Here, the swinging motion (rotational 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 driving of a motor or the like controlled by the control unit 70, for example.

The heating mechanism 50 includes, as shown in FIG. The power supply unit 55 is capable of supplying electricity to the metal pipe material 14 via the heat dissipation unit 56 and the electrodes 17 and 18 in a state where the electrodes 17 and 18 are electrically connected to the metal pipe material 14 . The power supply unit 55 includes a power supply 51 that outputs power as a direct current C, a busbar 52 that is connected to the power supply 51 and transmits the power output by the power supply 51 between the power supply 51 and the current-carrying heat dissipation unit 56, and a busbar. It has a switch 53 interposed in 52 and a cooling part 57 for cooling the bus bar 52 .

The heat radiation part 56 includes an n-type Peltier element 56a sandwiched between a pair of copper members 56c, 56c on both sides of an n-type Peltier element 56a, and a p-type Peltier element 56b sandwiched between a pair of copper members 56c, 56c on both sides. and a p-type Peltier current lead 56B sandwiched between. The n-type Peltier element 56a is made of metal (eg, Bi--Te, Ce--Sb--Te, etc.) containing at least one element selected from, for example, Bi, Te, Ce, Sb, Mg, and Si. good too. The p-type Peltier element 56b may be made of a metal (eg, Bi--Te, Co--Sb, etc.) containing at least one element selected from Bi, Te, Co, Sb, Mn, and Si. .

In this heating mechanism 50, a DC current C output from a power supply 51 is electrically transmitted by a bus bar 52 and input to an electrode 17 via an n-type Peltier current lead 56A. Then, the DC current C passes through the metal pipe material 14 and is input to the electrode 18 . Then, the DC current C is transmitted by the busbar 52 through the p-type Peltier current lead 56B and input to the power supply 51 .

When the direct current C is applied, the n-type Peltier current lead 56A absorbs heat from the boundary B1 between the n-type Peltier element 56a and the copper member 56c on the downstream side of the direct current C, The heat is radiated to the boundary portion B2 with the copper member 56c on the upstream side of the direct current C. On the other hand, when the direct current C is applied, the p-type Peltier current lead 56B absorbs heat from the boundary B3 between the p-type Peltier element 56b and the copper member 56c on the upstream side of the direct current C, and the p-type Peltier element The heat is dissipated to the boundary portion B4 between 56b and the copper member 56c on the downstream side of the direct current C.

N-type Peltier current lead 56 A is electrically connected between bus bar 52 and electrode 17 . More specifically, the n-type Peltier current lead 56A is provided so that the copper member 56c on the upstream side of the DC current C contacts the end 52a of the bus bar 52 on the power supply 51 side. The n-type Peltier current lead 56A is provided so that the copper member 56c on the downstream side of the DC current C is in contact with the electrode 17. As shown in FIG. As a result, the n-type Peltier current lead 56A is energized by the power supply section 55, thereby absorbing heat from the electrode 17 side and releasing heat to the power supply section 55 side.

A p-type Peltier current lead 56 B is electrically connected between the busbar 52 and the electrode 18 . More specifically, the p-type Peltier current lead 56B is provided so that the copper member 56c on the downstream side of the DC current C contacts the end 52b of the bus bar 52 on the power supply 51 side. The p-type Peltier current lead 56B is provided so that the copper member 56c on the upstream side of the DC current C is in contact with the electrode 18. As shown in FIG. As a result, the p-type Peltier current lead 56B is energized by the power supply unit 55, thereby absorbing heat from the electrode 18 side and releasing heat to the power supply unit 55 side.

The cooling part 57 is a mechanism for air-cooling the busbar 52 , more specifically, a plurality of fins erected on the surface of the busbar 52 . The control unit 70 heats the metal pipe material 14 to a quenching temperature (AC3 transformation point temperature or higher) by controlling the heating mechanism 50 .

Returning to FIG. 1, each of the pair of gas supply mechanisms 40 includes a cylinder unit 42, a cylinder rod 43 that advances and retreats in accordance with the operation of the cylinder unit 42, and a tip end of the cylinder rod 43 on the pipe holding mechanism 30 side. and a sealing member 44 . The cylinder unit 42 is placed and fixed on the block 41 . A tapered surface 45 is formed at the tip of the sealing member 44 so as to be tapered, and is configured in a shape to fit the tapered concave surfaces 17b and 18b of the electrodes 17 and 18 (see FIG. 2). The sealing member 44 has a gas passage extending from the side of the cylinder unit 42 toward the tip, and as shown in detail in FIGS. 46 is provided.

The gas supply unit 60 includes a gas source 61, an accumulator 62 for storing the gas supplied by the gas source 61, a first tube 63 extending from the accumulator 62 to the cylinder unit 42 of the gas supply mechanism 40, and the first tube 63. A pressure control valve 64 and a switching valve 65 interposed in one tube 63, a second tube 67 extending from the accumulator 62 to the gas passage 46 formed in the seal member 44, and It consists of a pressure control valve 68 and a check valve 69 provided. The pressure control valve 64 serves to supply gas to the cylinder unit 42 at an operating pressure adapted to the pressing force of the sealing member 44 against the metal pipe material 14 . The check valve 69 serves to prevent reverse flow of high-pressure gas within the second tube 67 . The pressure control valve 68 interposed in the second tube 67 serves to supply gas having an operating pressure for expanding the metal pipe material 14 to the gas passage 46 of the sealing member 44 under the control of the control unit 70. fulfill

By controlling the pressure control valve 68 of the gas supply unit 60 , the control unit 70 can supply gas at a desired operating pressure into the metal pipe material 14 . In addition, the control unit 70 acquires temperature information from the thermocouple 21 and controls the driving mechanism 80, the switch 53, and the like by receiving the information from (A) shown in FIG.

The water circulation mechanism 72 includes a water tank 73 that stores water, a water pump 74 that pumps up the water stored in the water tank 73, pressurizes it, and sends it to the cooling water passage 19 of the lower mold 11 and the cooling water passage 25 of the upper mold 12, A pipe 75 is provided. Although omitted, a cooling tower for lowering water temperature or a filter for purifying water may be interposed in the pipe 75 .

<Method of forming a metal pipe using a forming apparatus>
Next, a method of forming a metal pipe using the forming apparatus 10 will be described with reference to FIGS. 1 to 3. FIG. First, a hardenable steel grade metal pipe material 14 is prepared. The metal pipe material 14 is placed (thrown in) on the electrodes 17 and 18 provided on the lower mold 11 side using, for example, a robot arm. Since 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.

Next, the control unit 70 causes the pipe holding mechanism 30 to hold the metal pipe material 14 by controlling the driving mechanism 80 and the pipe holding mechanism 30 . Specifically, the drive mechanism 80 drives the upper mold 12 and the upper electrodes 17 and 18 held on the slide 81 side to move to the lower mold 11 side, and the upper electrodes 17 and 17 included in the pipe holding mechanism 30 move. By actuating the actuators that move the lower electrodes 17, 18, etc., and the like, the metal pipe material 14 is clamped from above and below by the pipe holding mechanism 30 near both ends. This clamping is achieved by the presence of the grooves 17a and 18a formed in the electrodes 17 and 18 and the grooves formed in the insulating materials 91 and 101 so that the metal pipe material 14 is closely attached over the entire circumference near both ends. It will be sandwiched in such a manner.

In addition, at this time, as shown in FIG. protrudes toward the sealing member 44 from the boundary of the . Similarly, the end of the metal pipe material 14 on the electrode 17 side protrudes toward the sealing member 44 from the boundary between the groove 17a and the tapered concave surface 17b of the electrode 17 in the extending direction of the metal pipe material 14 . Also, 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. However, the configuration is not limited to the configuration in which both end portions of the metal pipe material 14 are in close contact with each other over the entire periphery, and the configuration may be such that the electrodes 17 and 18 are in contact with a part of the metal pipe material 14 in the circumferential direction.

Subsequently, the controller 70 heats the metal pipe material 14 by controlling the heating mechanism 50 . Specifically, the controller 70 turns on the switch 53 of the heating mechanism 50 . Then, the power transmitted from the power supply 51 of the power supply unit 55 to the lower electrodes 17, 18 via the bus bar 52 and the heat radiation unit 56 is applied to the upper electrodes 17, 18 and the metal pipe sandwiching the metal pipe material 14. Due to the resistance supplied to the material 14 and present in the metal pipe material 14, the metal pipe material 14 itself generates heat due to Joule heat. Along with this, due to the resistance present in the electrodes 17 and 18, the electrodes 17 and 18 themselves generate heat due to Joule heat. Additionally, the electrodes 17 and 18 are also heated by heat conduction from the heated metal pipe material 14 .

At this time, the energizing/radiating portion 56 absorbs heat from the boundary portions B1 and B3 on the side of the electrodes 17 and 18 and radiates heat to the boundary portions B2 and B4 on the side of the power supplying portion 55 by being energized by the power supply portion 55 . Note that the measured value of the thermocouple 21 is constantly monitored, and energization is controlled based on this result.

Subsequently, the drive mechanism 80 is controlled by the controller 70 to close the blow molding die 13 to the heated metal pipe material 14 . Thereby, 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 arranged and sealed in the cavity between the lower mold 11 and the upper mold 12 .

After that, by operating the cylinder unit 42 of the gas supply mechanism 40 , the sealing member 44 is advanced to seal both ends of the metal pipe material 14 . At this time, as shown in FIG. 2(b), the sealing member 44 is pressed against the end of the metal pipe material 14 on the side of the electrode 18, so that the gap between the groove 18a of the electrode 18 and the tapered concave surface 18b is lowered. The portion protruding toward the sealing member 44 deforms into a funnel shape along the tapered concave surface 18b. Similarly, by pressing the sealing member 44 against the end of the metal pipe material 14 on the electrode 17 side, the portion protruding toward the sealing member 44 from the boundary between the groove 17a and the tapered concave surface 17b of the electrode 17 is It deforms into a funnel shape along the tapered concave surface 17b. After the sealing is completed, the blow molding die 13 is closed and high-pressure gas is blown into the metal pipe material 14 to mold the metal pipe material 14 softened by heating so as to conform to the shape of the cavity.

Since the metal pipe material 14 is heated to a high temperature (around 950° C.) and softened, the gas supplied into the metal pipe material 14 thermally expands. For this reason, for example, compressed air can be used as the gas to be supplied, and the metal pipe material 14 at 950° C. can be easily expanded by the thermally expanded compressed air.

The outer peripheral surface of the metal pipe material 14 expanded by blow molding contacts the cavity 16 of the lower mold 11 and is rapidly cooled, and at the same time, contacts the cavity 24 of the upper mold 12 and is rapidly cooled (the upper mold 12 and the lower mold 11 are Since the metal pipe material 14 has a large heat capacity and is controlled at a low temperature, when the metal pipe material 14 comes into contact with the metal pipe material 14, the heat of the pipe surface is taken away to the mold side at once.) and quenching is performed. Such a cooling method is called mold contact cooling or mold cooling. Immediately after quenching, austenite transforms into martensite (hereinafter, transforming austenite into martensite is referred to as martensite transformation). Since the cooling rate is low in the second half of cooling, martensite transforms into another structure (troostite, sorbite, etc.) due to reheating. Therefore, there is no need to perform tempering treatment separately. Further, in this embodiment, cooling may be performed by supplying a cooling medium, for example, into the cavity 24 instead of or in addition to mold cooling. For example, the metal pipe material 14 is cooled by contacting the metal molds (upper mold 12 and lower mold 11) until the temperature at which martensite transformation starts, and then the mold is opened and the cooling medium (cooling gas) is added to the metal pipe material. Blowing onto 14 may cause martensitic transformation.

After blow-molding the metal pipe material 14 as described above, the metal pipe material 14 is cooled and the mold is opened to obtain, for example, a metal pipe having a substantially rectangular cylindrical main body.

<Function and effect of the molding device>
As described above, in the molding apparatus 10 , the metal pipe material 14 is heated by the Joule heat generated by energizing the metal pipe material 14 via the electrodes 17 and 18 from the power supply unit 55 . At this time, the power radiating portion 56 electrically connected between the power supply portion 55 and the electrodes 17 and 18 is also energized. The energizing/radiating portion 56 absorbs heat from the electrodes 17 and 18 when energized. Therefore, temperature rise of the electrodes 17 and 18 can be suppressed.

Further, in the molding apparatus 10, in order to suppress the temperature rise of the electrodes 17 and 18, the electrodes 17 and 18 are not cooled by water, but the Peltier effect by the Peltier element is utilized. In general, when the electrodes 17 and 18 are water-cooled, it is necessary to insulate the electrodes 17 and 18 in order to suppress electric leakage or short circuit due to cooling water or the like. can be complicated. On the other hand, since the electrodes 17 and 18 are not water-cooled in the molding apparatus 10, the structure around the electrodes 17 and 18 can be simplified.

In addition, in the molding apparatus 10, the power supply unit 55 includes a power supply 51 that outputs power, a busbar 52 that transmits the power output by the power supply 51, and a cooling unit 57 that cools the busbar 52. The heat radiating portion 56 is electrically connected between the bus bar 52 and the electrodes 17 and 18 . When energized, the energizing and radiating section 56 radiates heat to the power supply section 55 side, so the bus bar 52 provided on the power supply section 55 side is heated. However, in this molding apparatus 10 , the busbars 52 are cooled by the cooling section 57 . Therefore, the temperature rise of the bus bar 52 can be suppressed.

Further, in the molding apparatus 10 , the energization heat radiation portion 56 is in contact with the electrodes 17 and 18 . Therefore, heat can be directly absorbed from the electrodes 17 and 18 by energizing the energizing/radiating portion 56 . Therefore, the temperature rise of the electrodes 17 and 18 can be further suppressed.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. For example, in at least one of the n-type Peltier current lead 56A and the p-type Peltier current lead 56B, instead of the copper members 56c, 56c, a copper alloy (an alloy of copper and Al or an Al alloy with low electric resistance) is used. A member may be used.

Also, the current-dissipating portion 56 does not have to be in contact with the electrodes 17 and 18, respectively. For example, a bus bar or the like other than the bus bar 52 may be interposed between the heat radiating portion 56 and the electrodes 17 and 18 .

Further, the cooling portion 57 may not be a fin for air-cooling the busbar 52, but may be a cooling water passage for water-cooling the busbar 52, for example. Since the busbar 52 is provided at a position away from the electrodes 17 and 18, even if the busbar 52 and the like are insulated to suppress electric leakage or short circuit due to cooling water or the like, The structure is difficult to complicate.

In addition, a plurality of energizing/radiating portions 56 may be electrically connected in parallel between the power supply portion 55 and the electrodes 17 and 18 . In this case, the amount of heat that can be absorbed from the electrodes 17 and 18 side can be increased by energizing the power supply unit 55 . Therefore, the temperature rise of the electrodes 17 and 18 can be further suppressed.

DESCRIPTION OF SYMBOLS 10... Molding apparatus 13... Blow-molding mold (mold) 14... Metal pipe material 17, 18... Electrode 51... Power supply 52... Bus bar 55... Electric power supply part 56... Electric heat radiation part 57... cooling section.

Claims (6)

a set of molds;
an electrode, which is a member separate from the set of molds and can be electrically connected to a metal material arranged between the set of molds;
a power supply unit capable of energizing the metal material through the electrode in a state where the electrode is electrically connected to the metal material;
A cooling unit that cools the electrode by contacting the electrode with a member that does not have a flow path for flowing a fluid inside and dissipating the heat of the member,
molding equipment. The cooling unit has at least one of a heat radiating unit that radiates the heat of the member from the outside of the member, and a heat absorbing and radiating unit that absorbs heat from the electrode and radiates the heat to the power supply unit side by being energized. Item 1. The molding apparatus according to item 1. 3. The molding apparatus according to claim 2, wherein said heat radiating portion is erected on the surface of said member. 4. The molding apparatus according to claim 3, wherein said heat radiating portion is arranged at a position spaced apart from said electrode. The molding apparatus according to any one of claims 2 to 4, comprising the heat radiation section and the heat absorption and radiation section. The metal material is a metal pipe material,
The forming apparatus according to any one of claims 1 to 5, further comprising a gas supply unit that supplies gas to the metal pipe material for expansion molding.

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