WO2008044776A1

WO2008044776A1 - Method for energization heating work, method for producing bonded body, method for producing sintered body, and device for energization heating work

Info

Publication number: WO2008044776A1
Application number: PCT/JP2007/070012
Authority: WO
Inventors: Takayuki Fujimori
Original assignee: Mole's Act Co., Ltd.
Priority date: 2006-10-13
Filing date: 2007-10-13
Publication date: 2008-04-17
Also published as: WO2008044320A1

Abstract

In a method for energization heating metal members (Wa, Wb) under a state where the metal members (Wa, Wb) are arranged between a pair of electrodes, electrodes (10a, 10b) having a structure of laminating in this order work side electrode bodies (12a, 12b), conductive felts (14a, 14b) having a thermal conductivity lower than that of the work side electrode bodies (12a, 12b) and an electric resistance higher than that of the work side electrode bodies (12a, 12b), and power supply side electrode bodies (16a, 16b) are employed. Since the above-mentioned conductive felts (14a, 14b) exist, transfer of heat generated from the metal members (Wa, Wb) or the work side electrode bodies (12a, 12b) to the power supply side electrode bodies (16a, 16b) can be suppressed, and a large quantity of heat can be generated from the conductive felts (14a, 14b). As a result, temperature of the metal members (Wa, Wb) can be raised easily as compared with the prior art, and heating efficiency of the metal members (Wa, Wb) can be enhanced remarkably as compared with the prior art.

Description

Specification

Workpiece heating method, bonded body manufacturing method, sintered body manufacturing method, and workpiece current heating device

Technical field

The present invention relates to a work current heating method, a joined body manufacturing method, a sintered body manufacturing method, and a ceramic current heating apparatus.

Background art

FIG. 19 is a view for explaining a conventional method of manufacturing a joined body.

As shown in FIG. 19, the conventional method for manufacturing a joined body includes a plurality of metal members W as a workpiece disposed between a pair of electrodes 910a and 910b electrically connected to a power supply device 930. This is a method for manufacturing a joined body in which a plurality of metal members W are energized and heated by flowing current through the plurality of metal members W to produce a joined body (see, for example, Patent Document 1).

[0003] According to the conventional method of manufacturing a joined body, it is possible to heat and heat a plurality of metal members W at a high temperature, and thus it is possible to manufacture a joined body by joining a plurality of metal members W. It becomes.

[0004] Patent Document 1: Japanese Patent Application Laid-Open No. 2005-262244

Disclosure of the invention

Problems to be solved by the invention

[0005] By the way, there is a demand in the conventional method for manufacturing a joined body that the heating efficiency of the workpiece is greatly increased as compared with the conventional method. If the heating efficiency of the workpiece can be made significantly higher than before, it will be possible to heat and heat the workpiece with much less power than before, and the heating time of the workpiece will be significantly shortened compared to the conventional method. In addition, even if the size of the cake is large, it is possible to heat by heating to a sufficiently high temperature.

[0006] Note that such a demand is not limited to the above-described manufacturing method of a joined body, but also a powder for a sintered body as a workpiece between a pair of electrodes (for example, metal powder, ceramic powder, etc.). In a state in which the sintered body powder is placed, the sintered body powder is energized and heated by passing an electric current through the sintered body powder. The same applies to the method of manufacturing a sintered body for manufacturing a sintered body.

[0007] That is, the desire to greatly increase the heating efficiency of the workpiece is that the workpiece energization heating in which the workpiece is energized and heated by passing a current through the workpiece with the workpiece placed between a pair of electrodes. It is common to all methods.

[0008] Therefore, the present invention has been made in view of such circumstances, and an object thereof is to provide a work energization heating method capable of significantly increasing the heating efficiency of a work than before. . In addition, the present invention provides a method for manufacturing a joined body for producing a joined body using such a work current heating method, and a method for producing a sintered body for producing a sintered body using such a work current heating method. The purpose is to provide. Furthermore, an object of the present invention is to provide a work energization heating apparatus that can significantly increase the heating efficiency of the work compared to the prior art.

Means for solving the problem

As a result of intensive efforts to achieve the above object, the inventor of the present invention divides at least one of the pair of electrodes into a work side electrode body and a power supply side electrode body. In addition, a conductive felt having a lower resistance than the work-side electrode body, a higher thermal conductivity and a higher electrical resistance than the work-side electrode body, and an electrical resistivity is disposed between the work-side electrode body and the power supply device-side electrode body. That is, at least one of the pair of electrodes has a work-side electrode body and lower than the work-side electrode body! /, Thermal conductivity and higher than the work-side electrode body! /, And electric resistivity. It has been found that by using an electrode having a structure in which a conductive felt and a power supply device side electrode body are laminated in this order, the heating efficiency of the workpiece can be made significantly higher than before. The present invention has been completed.

[0010] (1) The work energization heating method of the present invention is the work energization heating method in which the work is energized and heated in a state where the work is disposed between a pair of electrodes electrically connected to a power supply device. As at least one of the pair of electrodes, the workpiece side electrode body and the work side electrode body have lower! /, Thermal conductivity and higher than the workpiece side electrode body, and electrical resistivity. The workpiece is energized and heated using an electrode having a structure in which a conductive felt and a power supply device side electrode body are laminated in this order.

For this reason, according to the work energization heating method of the present invention, the work side electrode body and the power supply device side The presence of a conductive felt having a lower thermal conductivity than the workpiece-side electrode body between the electrode body and the heat generated in the workpiece and the workpiece-side electrode body is prevented from moving to the power supply device-side electrode body. Therefore, the temperature of the workpiece can be significantly increased more easily than before, and the heating efficiency of the workpiece can be significantly increased as compared with the conventional case.

[0012] Further, according to the work energization heating method of the present invention, the conductive felt having a higher electrical resistivity than the work side electrode body exists between the work side electrode body and the power supply side electrode body. Therefore, since it is possible to generate a large amount of heat in the conductive felt, the temperature of the workpiece is significantly easier to raise than in the past, and the heating efficiency of the workpiece is significantly higher than before. It becomes possible to do.

As a result, according to the work energization heating method of the present invention, the work can be energized and heated with much less electric power than before, and the temperature raising time of the work is significantly shortened compared to the conventional method. In addition, even if the workpiece is large in size, it can be heated and heated to a sufficiently high temperature.

[0014] In addition, in the conventional work energization heating method, since the entire electrode is heated to a high temperature in addition to the work, there is a problem that parts around the electrode (for example, the electrode mounting portion) are likely to deteriorate. . On the other hand, according to the work energization heating method of the present invention, there is a conductive felt having a lower thermal conductivity than the work side electrode body between the work side electrode body and the power supply side electrode body. Since it is possible to suppress the heat generated in the work and the work-side electrode body from moving to the power supply-side electrode body, it is possible to suppress the power supply-side electrode body from reaching a high temperature. It is possible to suppress surrounding parts from being easily deteriorated.

[0015] By the way, Japanese Patent Application Laid-Open No. 2005-230823 describes an electrode having a structure in which a workpiece side electrode body, a carbon chip, and a power supply side electrode body are laminated in this order as electrodes. (See Fig. 4 in Japanese Patent Publication No. 2005-230823). In the invention described in Japanese Patent Application Laid-Open No. 2005-230823, it is only necessary to use the elastic force of the carbon chip, and the conductive felt as in the present invention. It does not make use of low! /, Thermal conductivity and high electrical resistivity. Further, as shown in Test Example 1 described later, even if the electrode has the structure described in JP-A-2005-230823, the heating effect of the workpiece is The improvement in the rate is only small, and the effect as much as the work energization heating method of the present invention cannot be obtained.

[0016] In addition, JP 2004-323920 describes the use of carbon felt as a heat insulating material! (Refer to FIG. 1 and paragraph (0011) of JP 2004-323920 A). ). However, in the invention described in Japanese Patent Application Laid-Open No. 2004-323920, the carbon felt is only used as a heat insulating material wound around the outer peripheral surface of the mold of the electric heating and sintering apparatus, and is used as an electrode material. Not a translation. In addition, the invention described in Japanese Patent Application Laid-Open No. 2004-323920 uses only the low and / or thermal conductivity of carbon felt, and the conductive felt as in the present invention. It does not use the high electrical resistivity of

[0017] The conductive felt in the present invention refers to a felt formed by intertwining conductive fibers (for example, carbon fiber, stainless fiber, etc.).

[0018] Also, the workpiece side electrode body in the present invention refers to an electrode body disposed on the workpiece side among the electrode bodies constituting the electrode, and the power supply apparatus side electrode body in the present invention constitutes an electrode. Of the electrode bodies to be installed, the electrode body arranged on the power supply side is! /.

(2) In the work energization heating method of the present invention, the thermal conductivity of the conductive felt is 1/10 or less of the thermal conductivity of the work-side electrode body, and the conductive felt The electrical resistivity is preferably at least 5 times the electrical resistivity of the workpiece side electrode body! /.

[0020] Thus, by making the thermal conductivity of the conductive felt 1/10 or less of the thermal conductivity of the workpiece side electrode body, the heat generated in the workpiece or the workpiece side electrode body is transferred to the power supply device side electrode body. It is possible to greatly suppress the movement. Further, by setting the electrical resistivity of the conductive felt to 5 times or more of the electrical resistivity of the cake side electrode body, it is possible to generate a large amount of heat in the conductive felt.

(3) In the work energization heating method of the present invention, the conductive felt is preferably made of carbon felt having a force and a density of 0.2 g / cm ³ or less.

[0022] A carbon felt having a force and density of 0.2 g / cm ³ or less has a sufficiently low thermal conductivity and a sufficiently high electrical resistivity. It is possible to greatly suppress the heat generated in the cake side electrode body from moving to the power source side electrode body. It becomes possible, and it becomes possible to generate a large amount of heat with the conductive felt.

[0023] In addition, since carbon felt has excellent heat resistance, the heat resistance of the conductive felt can be increased by adopting such a method.

[0024] The carbon felt in the present invention refers to a carbon fiber intertwined into a felt shape.

(4) In the work energization heating method of the present invention, the conductive felt preferably has a structure in which a plurality of felt pieces are laminated.

[0026] By adopting such a method, it is possible to increase the thickness of the conductive felt, so that the heat generated in the workpiece and the workpiece-side electrode body is transferred to the power supply device-side electrode body. Furthermore, it becomes possible to significantly reduce the amount of heat generated by the conductive felt, and the force S can be generated.

[0027] (5) In the work energization heating method of the present invention, it is preferable that the thickness of the conductive felt is less than the thickness of the work-side electrode body.

[0028] When the thickness of the conductive felt becomes thicker than the thickness of the workpiece-side electrode body, the electrical resistance in the conductive felt becomes too large, and the amount of heat generated in the conductive felt (in other words, the amount of power consumed). Is too large compared to the amount of heat generated by the workpiece and the workpiece-side electrode body (in other words, power consumption). For this reason, it is difficult to supply the necessary amount of current if power supplies with the same power are used, so the amount of heat generated in the workpiece and workpiece-side electrode body is reduced, resulting in the heating efficiency of the workpiece. It is also a force that will reduce From this viewpoint, it is more preferable that the thickness of the conductive felt is thinner than half the thickness of the workpiece-side electrode body.

(6) In the work energization heating method of the present invention, it is preferable that the work side electrode body and the power supply side electrode body are made of a carbon material! /.

[0030] Since the carbon material has excellent heat resistance, the heat resistance of the workpiece-side electrode body can be increased by employing such a method.

[0031] As the carbon material used for the workpiece-side electrode body or the power supply apparatus-side electrode body, graphite, a single-bon composite material, or the like can be used.

(7) In the work energization heating method of the present invention, a gap between the pair of electrodes and the work is set. It is preferable that the workpiece is heated by energization with the carbon sheets arranged on the plate.

[0033] When the work-side surface lubricity of the electrode is low, the electrode and the work may be seized when the work is energized and heated. On the other hand, according to the present invention, since the surface of the carbon sheet has high lubricity, it is possible to suppress seizure between the electrode and the workpiece.

[0034] The carbon sheet in the present invention refers to a carbon fiber formed into a sheet shape.

(8) In the work energization heating method of the present invention, the power supply device side electrode body preferably has a structure in which a plurality of flat plates are laminated.

[0036] By adopting such a method, it is possible to change the distance between the pair of electrodes by increasing or decreasing the number of flat plates, and the work of arranging workpieces of various thicknesses between the pair of electrodes is possible. It can be done easily.

(9) In the work energization heating method of the present invention, it is preferable that the planar size of each flat plate in the power supply device side electrode body gradually increases toward the work side electrode body.

[0038] By adopting such a method, it becomes possible to increase the plane size of the work side electrode body without changing the plane size of the flat plate on the power source apparatus side in the power supply side electrode body. It becomes possible to electrically heat a workpiece having a planar size.

(10) In the work energization heating method of the present invention, it is preferable that the work is energized and heated in a state where a heat insulating housing is disposed around the work.

[0040] By adopting such a method, it is possible to suppress the heat generated in the work from being radiated to the surrounding space due to the presence of the heat insulating housing. This makes it easier to raise the temperature and makes it possible to further increase the heating efficiency of the workpiece.

[0041] Further, by using such a method, the presence of the heat insulating housing makes it possible to suppress the heat generated in the cake from being radiated to the surrounding space. Suppressing deterioration of surrounding components (for example, a vacuum chamber described later). Is possible.

(1 1) In the work energization heating method of the present invention, the heat insulating housing preferably has a carbon felt lining.

[0043] Since carbon felt has a low thermal conductivity, it is possible to further suppress the heat generated in the cake from being radiated to the surrounding space by using such a method. For this reason, the temperature of the workpiece can be more easily increased, and the force S can be increased to further increase the heating efficiency of the workpiece.

[0044] Further, by adopting such a method, it is possible to further suppress the heat generated in the work from being radiated to the surrounding space, so that the parts around the work are likely to deteriorate. Further suppression is possible.

[0045] In the work energization heating method of the present invention, a slit portion or a window portion is formed in the heat insulating housing!

[0046] By adopting such a method, it is possible to observe the state of the workpiece through the slit portion or the window portion even if the workpiece is covered with the heat insulating housing.

[0047] Also, when a thermocouple for measuring the workpiece temperature is placed on the workpiece, the thermocouple wiring can be pulled out of the heat insulating housing through the slit portion or the window portion, and the thermocouple wiring can be removed. It is possible to easily perform the routing.

[0048] (12) In the work energization heating method of the present invention, any electrode of the pair of electrodes has a work-side electrode body, a lower thermal conductivity than the work-side electrode body, and the temperature It is preferable that the workpiece is energized and heated using an electrode having a structure in which the conductive felt having a higher electrical resistance than the first electrode body and the electric power device side electrode body and the force S are stacked in this order. .

[0049] By adopting such a method, any of the pair of electrodes has a lower thermal conductivity than the work side electrode body between the work side electrode body and the power supply apparatus side electrode body. The presence of the conductive felt makes it possible to suppress the heat generated in the workpiece and the workpiece-side electrode body from moving to the power supply device-side electrode body. It is possible to further greatly increase the heating efficiency.

[0050] By adopting such a method, in any of the pair of electrodes, Since there is a conductive felt having a higher electric resistivity than the work side electrode body between the work side electrode body and the power supply side electrode body, the conductive felt has a large amount of heat! From this point, the temperature of the workpiece can be easily raised more than before, and the heating efficiency of the workpiece can be significantly higher than that of the conventional.

[0051] As a result, according to the work energization heating method of the present invention, it becomes possible to energize and heat the work with much smaller electric power, and to further greatly shorten the temperature raising time of the work. In addition, even when the workpiece size is large, it is possible to heat the current to a sufficiently high temperature.

[0052] Further, by adopting such a method, in any electrode of the pair of electrodes, a lower thermal conductivity than the work side electrode body is provided between the work side electrode body and the power supply apparatus side electrode body. The presence of the conductive felt can suppress the heat generated in the work and the work-side electrode body from moving to the power supply-side electrode body, so that the power supply-side electrode body becomes hot. It is possible to suppress the deterioration of the components around the electrode.

[0053] In the work energization heating method of the present invention, it is preferable that the work is energized and heated in a state where the pair of electrodes are pressed in a direction approaching each other.

[0054] By adopting such a method, the close contact between each electrode and the workpiece is increased, and the contact resistance between each electrode and the workpiece is less likely to fluctuate, so that stable energization heating can be performed. Become.

[0055] In the work energization heating method of the present invention, it is preferable that the work is energized and heated in a state in which a portion of the pair of electrodes on the power supply device side is cooled.

[0056] By adopting such a method, it is possible to prevent the portion of the electrode on the power supply device side from rising to an undesired temperature, and the components around the electrode are more likely to deteriorate. It becomes possible to suppress.

[0057] In the work energization heating method of the present invention, it is preferable that the work is energized and heated by passing a pulse current through the work.

[0058] By adopting such a method, the heating efficiency of the workpiece can be further greatly increased. Note that the reason why the heating efficiency of the workpiece can be further increased by flowing the noise current is that the induced current is induced in the workpiece by the noise current. This is presumably because the work generates heat to a higher temperature than usual due to the action of the induced current.

[0059] (13) A method for manufacturing a joined body according to the present invention is a method for manufacturing a joined body using the work energization heating method according to the present invention, wherein a plurality of metal members are prepared as a workpiece. A member preparation step, a metal member placement step of placing the plurality of metal members in a state in which the surfaces to be joined are abutted between the pair of electrodes, and a state in which the pair of electrodes are pressed in a direction approaching each other. And an electric heating step of joining the plurality of metal members by energization heating of the plurality of metal members in this order.

[0060] Therefore, according to the method for manufacturing a joined body of the present invention, by using the work energization heating method of the present invention, a plurality of metal members can be energized and heated with high heating efficiency. It is possible to join a plurality of metal members with much less power than that, and it is possible to greatly reduce the time required to join a plurality of metal members. Even when the size of the member is large, it becomes possible to bond at a sufficiently high temperature.

[0061] Further, according to the method for manufacturing a joined body of the present invention, it is possible to heat and heat a plurality of metal members with high! / Heating efficiency, so that the plurality of metal members are joined at a sufficiently high temperature. This makes it possible to manufacture a high-quality joined body.

[0062] Also, according to the method for manufacturing a joined body of the present invention, it is possible to heat and heat a plurality of metal members with high! / Heating efficiency, and therefore it is possible to produce a joined body with low manufacturing cost. Is possible.

[0063] (14) In the method for producing a joined body of the present invention, the arithmetic average roughness Ra of the planned joining surface of each metal member is preferably 0.02 ^ 111-0.2 m.

[0064] The arithmetic average roughness Ra of the planned joining surface of each metal member is set to 0.2 μm or less when the arithmetic average roughness Ra of the planned joining surface of each metal member exceeds 0.2 m. This is because it is difficult to obtain a sufficiently high joining force because the energization heating process is performed in a state where the distance between the surfaces to be joined in each metal member exceeds 0.4 m on average. In addition, the arithmetic average roughness Ra of the surfaces to be bonded in each metal member was set to 0.02 111 or more when the arithmetic average roughness Ra of the surfaces to be bonded in each metal member was less than 0.02 m. In this case, the contact resistance at the abutting surface of each metal member (resistance at the joining surface of each metal member in the later stage of the energization heating process) cannot be sufficiently increased, so that sufficient heat generation can be obtained. This is because it becomes difficult. From these viewpoints, it is preferable that the arithmetic average roughness Ra of the surfaces to be joined in each metal member is 0 · 04 ^ 111-0.15111.

(15) In the method for manufacturing a joined body according to the present invention, at the initial stage of the energization heating step, the plurality of metal members are energized and heated while a predetermined first pressure is applied to the pair of electrodes. In the latter stage of the energization heating step, it is preferable that the plurality of metal members be energized and heated while a second pressure higher than the first pressure is applied to the pair of electrodes.

[0066] By the way, in order to manufacture a joined body having a sufficiently high joining force, it is necessary to energize and heat a plurality of metal members in a state where a relatively high pressure and pressure (for example, IMPa) are applied to a pair of electrodes. There is. However, when multiple metal members are energized and heated with a relatively high pressure (such as IMPa) applied to the pair of electrodes from the beginning of the energization heating process, Since the contact resistance at the abutting surface of the member cannot be made sufficiently high, it becomes difficult to obtain a sufficient calorific value. On the other hand, according to the method for manufacturing a joined body of the present invention, in the initial stage of the electric heating process, the second pressure (for example, IMPa) to be applied to the pair of electrodes V at the latter stage of the electric heating process. Lower than /, and the first pressure (for example, 0.3 MPa) is applied to heat and heat multiple metal members, so that the contact resistance at the butt surface of each metal member must be sufficiently high It becomes possible to obtain a sufficient calorific value from the beginning of the energization heating process.

[0067] In the joined body of the present invention, the pressure may be increased in two stages during the energization heating process, or the pressure may be increased in three or more stages. Further, the pressure may be increased stepwise during the electric heating process, or the pressure may be increased continuously.

[0068] (16) In the method for manufacturing a joined body according to the present invention, in the initial stage of the energization heating step, the plurality of metal members are energized and heated at a predetermined current amount, and are delayed in the later stage of the energization heating step. It is preferable that the plurality of metal members be electrically heated by an amount of current more than the initial stage of the energization heating step. [0069] By the way, when a joined body is manufactured by energization heating, the contact resistance tends to gradually decrease in the process of joining a plurality of metal members during the energization heating process. For this reason, assuming that current heating is performed under the condition that the amount of current is constant, as is clear from the relationship of W (power) = 1 (current) XR ² (square of resistance), The calorific value gradually decreases, and the temperature at the joint cannot be raised sufficiently. On the other hand, according to the method for manufacturing a joined body of the present invention, a plurality of metal members are energized and heated in a later stage of the energization heating process than in the initial stage of the energization heating process. It becomes possible to suppress a decrease in the amount of heat generated per hour, and it is possible to sufficiently increase the temperature of the joint portion.

[0070] In the method for manufacturing a joined body of the present invention, the amount of current may be increased in two stages during the energization heating process, or the amount of current may be increased in three or more stages. Further, the amount of current may be increased stepwise during the current heating process, or the amount of current may be increased continuously.

[0071] (17) In the method for manufacturing a joined body according to the present invention, it is preferable to apply a pressure of 2 MPa or more to the pair of electrodes at a later stage of the energization heating process or after the energization heating process.

[0072] By adopting such a method, it is possible to obtain a bonded body with higher bonding strength. For this reason, even when a die used under severe conditions, such as a die-cast die, is manufactured from the obtained joined body, it is possible to obtain a die that can sufficiently withstand use.

[0073] (18) The method for producing a sintered body of the present invention is a method for producing a sintered body by using the work energization heating method of the present invention. In a state of pressing the sintered body powder preparing step, the sintered body powder arranging step of arranging the sintered body powder between the pair of electrodes, and the pair of electrodes being brought closer to each other. And an electric heating step of sintering the powder for a sintered body by heating the powder for a sintered body in this order.

[0074] For this reason, according to the method for producing a sintered body of the present invention, it becomes possible to electrically heat the sintered body powder with high! / Heating efficiency. It becomes possible to sinter the powder for sintered bodies, and the time required to sinter the powder for sintered bodies is greatly increased. In addition, even when a sintered body having a large size is manufactured, it is possible to sinter at a sufficiently high temperature.

[0075] Further, according to the method for producing a sintered body of the present invention, the sintered body powder can be conductively heated with high heating efficiency, so that the sintered body powder is sintered at a sufficiently high temperature. As a result, it becomes possible to produce a high-quality sintered body.

[0076] Further, according to the method for producing a sintered body of the present invention, it becomes possible to sinter the powder for a sintered body with high heating efficiency, and therefore it is possible to produce a sintered body at a low production cost. Is possible

(19) In the method for producing a sintered body according to the present invention, after the energization heating step, a sintered body arranging step of arranging the sintered body between the pair of electrodes, and the sintering It is preferable to further include a second energization heating step of energizing and heating the body.

[0078] By adopting such a method, the degree of sintering of the sintered body can be further increased, and a high-quality sintered body can be produced.

[0079] (20) The work energization heating device of the present invention includes a power supply device, a pair of electrodes electrically connected to the power supply device, and a vacuum chamber in which the pair of electrodes are installed. In the work energization heating apparatus that energizes and heats the work disposed between the pair of electrodes, at least one of the pair of electrodes is lower than the work side electrode body and the work side electrode body. It is characterized by having a structure in which a conductive felt having a thermal conductivity and higher electrical conductivity than the workpiece side electrode body and a power supply side electrode body are laminated in this order. To do.

[0080] Therefore, according to the work energization heating device of the present invention, there is a conductive felt having a lower thermal conductivity than the work side electrode body between the work side electrode body and the power supply side electrode body. As a result, it is possible to suppress the heat generated in the workpiece and workpiece side electrode body from moving to the power supply side electrode body. The efficiency can be made significantly higher than before.

[0081] Further, according to the work energization heating device of the present invention, the conductive felt having a higher electrical resistivity than the work side electrode body exists between the work side electrode body and the power supply side electrode body. It is possible to generate a large amount of heat in the conductive felt Therefore, also from this point, the temperature of the workpiece can be greatly increased more easily than in the past, and the heating efficiency of the workpiece can be significantly increased than before.

As a result, according to the workpiece energization heating apparatus of the present invention, it is possible to energize and heat the workpiece with much less electric power than before, and the workpiece heating time is significantly shortened compared to the conventional method. In addition, even if the workpiece is large in size, it can be heated and heated to a sufficiently high temperature.

[0083] Further, according to the work energization heating apparatus of the present invention, there is a conductive felt having a lower thermal conductivity than the work side electrode body between the work side electrode body and the power supply side electrode body. As a result, it is possible to suppress the heat generated in the work and the work-side electrode body from moving to the power supply-side electrode body. It is possible to suppress the deterioration of parts around the electrode.

(21) In the work energization heating device of the present invention, any electrode of the pair of electrodes includes a work side electrode body, a lower thermal conductivity than the work side electrode body, and the work side electrode. It is preferable to have a structure in which a conductive felt having an electrical resistivity higher than that of the body and a power supply device side electrode body are laminated in this order.

[0085] With this configuration, any of the pair of electrodes has a lower thermal conductivity than the work side electrode body between the work side electrode body and the power supply apparatus side electrode body. The presence of the felt makes it possible to suppress the heat generated in the workpiece and the workpiece side electrode body from moving to the power supply side electrode body. The heating efficiency can be further greatly increased.

[0086] With this configuration, in any electrode of the pair of electrodes, an electrical resistivity higher than that of the work side electrode body is provided between the work side electrode body and the power supply side electrode body. Since there is a conductive felt having a large amount of heat, it is possible to generate a large amount of heat in the conductive felt. From this point as well, the temperature of the workpiece is much easier to raise than before, and the heating of the workpiece The efficiency can be made significantly higher than before.

As a result, according to the work energization heating apparatus of the present invention, it becomes possible to energize and heat the work with much smaller electric power, and to further greatly shorten the temperature raising time of the work. Furthermore, even if the workpiece size is large, the temperature is sufficiently high. It is possible to heat and heat each time.

[0088] Also, with this configuration, in any of the pair of electrodes, the thermal conductivity lower than that of the work-side electrode body is between the work-side electrode body and the power supply-side electrode body. Therefore, it is possible to suppress the heat generated in the work and the work-side electrode body from moving to the power supply-side electrode body, so that the power supply-side electrode body is heated to a high temperature. It is possible to suppress the deterioration of the components around the electrode.

(22) The work energization heating apparatus of the present invention is preferably a joining apparatus that energizes and heats a plurality of metal members as the work to join the plurality of metal members.

[0090] With such a configuration, it is possible to significantly increase the heating efficiency when energizing and heating a plurality of metal members than before. As a result, it is possible to join a plurality of metal members with much less power than before, and it is possible to greatly reduce the time required to join a plurality of metal members. Even if the plurality of metal members are large in size, they can be joined.

(23) The workpiece energization heating apparatus of the present invention is preferably a sintering device that sinters the sintered body powder by energizing and heating the sintered body powder as the workpiece.

By configuring in this way, it becomes possible to significantly increase the heating efficiency when the sintered powder is heated by current. As a result, it becomes possible to sinter sintered powder with much less power than before, and to significantly reduce the time required to sinter the sintered powder. In addition, even when a sintered body having a large size is manufactured, it is possible to heat by heating to a sufficiently high temperature.

[0093] It should be noted that the preferred feature described in the work electrical heating method of the present invention (the work electrical heating method described in any one of (1) to (; 12) above) is the work electrical heating apparatus of the present invention (above (20) to (23)! /, The workpiece energization heating device described in any of the above).

Brief Description of Drawings

FIG. 1 is a diagram showing a workpiece energization heating apparatus 100 used in a method for manufacturing a joined body according to Embodiment 1.

FIG. 2 is a flowchart shown for explaining a method for manufacturing a joined body according to Embodiment 1. FIG. 3 is a view for explaining the method for manufacturing the joined body according to the first embodiment.

FIG. 4 is a diagram showing a workpiece energization heating apparatus 200 used in the method for manufacturing a joined body according to Embodiment 2.

FIG. 5 is a diagram showing a workpiece energization heating apparatus 300 used in the method for manufacturing a joined body according to Embodiment 3.

FIG. 6 is a diagram showing a workpiece energization heating apparatus 400 used in the method for manufacturing a joined body according to Embodiment 4.

FIG. 7 is a view for explaining a heat insulating housing 470.

FIG. 8 is a diagram showing a workpiece energization heating apparatus 500 used in the method for manufacturing a joined body according to Embodiment 5.

FIG. 9 is a flowchart for explaining a method for manufacturing a sintered body according to Embodiment 6.

FIG. 10 is a view for explaining the method for manufacturing the sintered body according to the sixth embodiment.

FIG. 11 is a flow chart for explaining a method for manufacturing a sintered body according to Embodiment 7.

FIG. 12 is a view shown for explaining a method for manufacturing a sintered body according to Embodiment 7.

FIG. 13 is a diagram for explaining a work energization heating method in Test Example 1.

FIG. 14 is a graph showing test results in Test Example 1.

FIG. 15 is a drawing-substituting photograph showing the electrically heated state of metal members Wa and Wb and electrodes 10a to 10f in Test Example 1.

FIG. 16 is a graph showing test results in Test Example 2.

FIG. 17 is a graph showing test results in Test Example 3.

FIG. 18 is a graph showing test results in Test Example 4.

BEST MODE FOR CARRYING OUT THE INVENTION

DESCRIPTION OF EMBODIMENTS Hereinafter, a workpiece energization heating method, a joined body manufacturing method, a sintered body manufacturing method, and a workpiece energization heating apparatus according to the present invention will be described based on embodiments shown in the drawings. [Embodiment 1]

Embodiment 1 describes a case in which the work energization heating method of the present invention is applied to a joined body manufacturing method (joint body manufacturing method according to Embodiment 1) in which a plurality of metal members are joined to produce a joined body. It is embodiment to do.

FIG. 1 is a view showing a work energization heating apparatus 100 used in the method for manufacturing a joined body according to the first embodiment. In FIG. 1, the upper side of the drawing sheet is the upper side of the workpiece energization heating apparatus 100, and the lower side of the drawing plane is the lower side of the workpiece conduction heating apparatus 100. FIG. 2 is a flowchart for explaining the method for manufacturing the joined body according to the first embodiment.

FIG. 3 is a view for explaining the method for manufacturing the joined body according to the first embodiment. Fig 3

(a) is a diagram showing a metal member preparation step S 110, FIG. 3 (b) is a diagram showing a metal member arrangement step S 120, and FIG. 3 (c) is a diagram showing an electric heating step S 130. FIG. 3 (d) is a view showing a joined body manufactured by the method for manufacturing a joined body according to the first embodiment. 3 (b) and 3 (c), only the pair of electrodes 10a and 10b, the power supply device 30, the wiring 32, and the two metal members Wa and Wb are shown in order to simplify the drawing.

[0099] The method of manufacturing the joined body according to Embodiment 1 is electrically connected to the power supply device 30 using the workpiece energization heating apparatus 100 (work energization heating apparatus 100 according to Embodiment 1) shown in FIG. With the two metal members Wa and Wb as a workpiece placed between the pair of electrodes 10a and 10b, the metal members Wa and Wb are energized and heated by flowing current through the metal members Wa and Wb to join them. This is a method for manufacturing a joined body for manufacturing a body (see FIG. 3 (d)).

As shown in FIG. 1, the work energization heating apparatus 100 according to Embodiment 1 includes a power supply device 30, a pair of electrodes 10a, 10b electrically connected to the power supply device 30, and a pair of electrodes 10a, A vacuum chamber 40 in which 10b is installed; a pair of cooling bodies 20a, 20b that cool the pair of electrodes 10a, 10b; and a pressing device 50 that presses the pair of electrodes 10a, 10b toward each other. The joining device joins the metal members Wa and Wb by energizing and heating the metal members Wa and Wb disposed between the pair of electrodes 10a and 10b.

[0101] The power supply device 30 has a function of causing a pulse current to flow through the metal members Wa and Wb, and a pair of wires 32, the cooling bodies 20a and 20b, and the cooling body protection plates 24a and 24b (described later). The electrodes 10a and 10b are electrically connected. [0102] In the method of manufacturing the joined body according to Embodiment 1, when the metal members Wa and Wb are energized and heated, the metal members Wa and Wb are energized and heated by applying a pulse current to the metal members Wa and Wb. .

[0103] The pair of electrodes 10a and 10b includes a work-side electrode body 12a and 12b, and a conductor having lower thermal conductivity than the work-side electrode bodies 12a and 12b and higher electrical resistivity than the work-side electrode bodies 12a and 12b. The electric felts 14a and 14b and the power supply device side electrode bodies 16a and 16b are stacked in this order.

[0104] The workpiece-side electrode bodies 12a and 12b are electrode bodies arranged on the metal members Wa and Wb side among the electrode bodies constituting the electrodes 10a and 10b. As the work-side electrode bodies 12a and 12b, disk-shaped flat plates made of a carbon material (for example, ISEM-3 manufactured by Toyo Tanso Co., Ltd.) are used. The thermal conductivity of the workpiece side electrode bodies 12a, 12b is, for example, 128 W / (m′K). The electrical resistivity of the negative electrode bodies 12a, 12b is, for example, 10. μμΩ′m. The size of the workpiece side electrode bodies 12a and 12b is, for example, 100 mm (diameter) × 20 mm (thickness).

[0105] The conductive felts 14a and 14b are members disposed between the work-side electrode bodies 12a and 12b and the power supply-side electrode bodies 16a and 16b among the members constituting the electrodes 10a and 10b. As the conductive felts 14a and 14b, disc-shaped carbon felt (for example, a product manufactured by Across Co., Ltd., fired at 2000 ° C.) is used. The thermal conductivity of the conductive felts 14a and 14b is, for example, 0.6 W / (mK). The electrical resistivity of the conductive felts 14a and 14b is, for example, 1000 Ω′m. The force and density of the conductive felts 14a and 14b are, for example, 0. lg / cm ³ . The size of the workpiece conductive felts 14a and 14b is, for example, 100 mm (diameter) X about 4 mm (thickness) in a natural state where no load is applied. When the conductive felts 14a, 14b are disposed between the workpiece side electrode bodies 12a, 12b and the power supply side electrode bodies 16a, 16b, the thickness of the conductive felts 14a, 14b is, for example: It becomes about 2mm.

[0106] The thermal conductivities (0.6 W / (m.K)) of the conductive felts 14a, 14b are about 1/200 of the thermal conductivities (128 W / (m-K)) of the workpiece side electrode bodies 12a, 12b.

[0107] The electrical resistivity (1000 Ω.m) of the conductive felts 14a, 14b is about 100 times the electrical resistivity (10 · ΟμΩ.πι) of the workpiece side electrode bodies 12a, l ² b.

[0108] The thickness (4mm) of the conductive phenols 14a, 14b is the same as the thickness of the workpiece side electrode bodies 12a, 12b (20m thinner than m).

[0109] The power supply device side electrode bodies 16a and 16b are electrode bodies arranged on the power supply device 30 side among the electrode bodies constituting the electrodes 10a and 10b. The upper power supply device side electrode body 16a has a structure in which three flat plates 18a to 18a are laminated. The lower power supply side electrode body 16b has three flat

13

Plates 18b to 18; have a structure in which 18b is laminated.

13

[0110] Flat plates 18a-; 18a, 18b-;

1 3 1 3

A flat plate (for example, ISEM-3, manufactured by Toyo Tanso Co., Ltd.) is used. Flat plate 18a ~; 18a, 18

1 3 b˜: The thermal conductivity of L 8b is, for example, 128 W / (m′K). Flat plate 18a, 18a, 18b

1 3 1 2 1

The size of 18b is, for example, 100mm (diameter) x 20mm (thickness), flat plate 18a, 18b

The size of 2 3 is, for example, 150 mm (diameter) X 20 mm (thickness). Flat plate 18a-18

3 The flat size of the flat plate 18a is the same as that of the upper cooling body protection plate 24a.

3 3

Yes, of the flat plates 18b to 18b, the plane size of the flat plate 18b is the lower cooling body protection plate 24b

1 3 3

Is the same as the plane size.

[0111] In the method of manufacturing the joined body according to Embodiment 1, the number of flat plates 18a to 18a, 18b to 18b is increased or decreased depending on the size (thickness) of the metal members Wa and Wb. Can do.

1 3 1 3

[0112] The vacuum chamber 40 includes a pair of electrodes 10a and 10b, metal members Wa and Wb, and a pair of cooling bodies.

20a and 20b are included. A vacuum pump 60 for discharging the gas inside the vacuum chamber 40 to the outside is attached to the vacuum chamber 40.

[0113] The cooling bodies 20a and 20b are each made of stainless steel. Cooling medium flow paths 22a and 22b for flowing the cooling medium are formed in the cooling bodies 20a and 20b, respectively.

[0114] Between the cooling body 20a and the electrode 10a, a cooling body protection plate 24a made of stainless steel for protecting the cooling body 20a from heat generated in the electrode 10a is disposed. Similarly, a cooling body protection plate 24b made of stainless steel is provided between the cooling body 20b and the electrode 10b to protect the cooling body 20b from heat generated in the electrode 10b.

[0115] In the method of manufacturing the joined body according to Embodiment 1, when the metal members Wa and Wb are energized and heated, the cooling medium (cooling water) is added to the cooling medium passages 22a and 22b of the cooling bodies 20a and 20b. By flowing, the metal members Wa and Wb are energized and heated in a state where the portions on the power supply device 30 side of the pair of electrodes 10a and 10b are cooled. [0116] The pressing device 50 has a hydraulic cylinder 52 that can move up and down, and is attached below the cooling body 20b. When the hydraulic cylinder 52 moves upward, the electrode 10b is pushed upward together with the cooling body 20b, and as a result, the pair of electrodes 10a and 10b are pressed toward each other.

[0117] In the method for manufacturing a joined body according to Embodiment 1, when the metal members Wa and Wb are energized and heated, the metal is pressed in a state in which the pair of electrodes 10a and 10b are pressed toward each other by the pressing device 50. The members Wa and Wb are heated by energization.

[0118] As shown in FIGS. 2 and 3, the method of manufacturing the joined body according to Embodiment 1 includes a metal member preparation step S110, a metal member arrangement step S120, and an electric heating step S130 in this order. Including Hereinafter, these steps will be described in order.

[0119] 1. Metal parts preparation process S110

First, two metal members Wa and Wb are prepared as workpieces (see FIG. 3 (a)).

[0120] 2. Metal member placement process S 120

Next, the metal members Wa and Wb are arranged between the pair of electrodes 10a and 10b with the surfaces to be joined Sa and Sb (see FIG. 3 (a)) butted (see FIG. 3 (b)). .)

[0121] 3. Electrical heating process S 130

Next, by passing an electric current through the metal members Wa and Wb, the metal members Wa and Wb are energized and heated to join the metal members Wa and Wb (see FIG. 3C).

[0122] By performing the above steps, the joined body Pj can be manufactured (see FIG. 3 (d)).

[0123] According to the manufacturing method of the joined body according to the first embodiment described above, the gap between the workpiece side electrode bodies 12a, 12b and the power supply side electrode bodies 16a, 16b is lower than that of the workpiece side electrode bodies 12a, 12b. The presence of the conductive felts 14a and 14b having thermal conductivity suppresses the heat generated in the metal members Wa and Wb and the workpiece side electrode bodies 12a and 12b from moving to the power supply side electrode bodies 16a and 16b. Therefore, the temperature of the metal members Wa and Wb can be greatly increased than before, and the heating efficiency of the metal members Wa and Wb can be significantly increased as compared with the prior art.

[0124] Further, according to the manufacturing method of the joined body according to the first embodiment, the electric power higher than that of the work side electrode bodies 12a and 12b is provided between the work side electrode bodies 12a and 12b and the power supply apparatus side electrode bodies 16a and 16b. resistance Since the conductive felts 14a and 14b have a force S, a large amount of heat can be generated in the conductive felts 14a and 14b. From this point, the metal parts Wa and Wb It becomes easier to raise the temperature than before, and the heating efficiency of the metal members Wa and Wb can be made significantly higher than before.

As a result, according to the method for manufacturing the joined body according to Embodiment 1, it is possible to heat and heat the metal members Wa and Wb with much less electric power than before, and the metal members Wa and Wb can be heated. It is possible to significantly shorten the temperature rise time than before, and furthermore, even if the metal members Wa and Wb are large in size, they can be heated to a sufficiently high temperature.

[0126] Further, according to the manufacturing method of the joined body according to the first embodiment, a lower heat than the work side electrode bodies 12a, 12b is provided between the work side electrode bodies 12a, 12b and the power supply device side electrode bodies 16a, 16b. The presence of the conductive felts 14a and 14b having conductivity suppresses the heat generated in the metal members Wa and Wb and the workpiece side electrode bodies 12a and 12b from moving to the power supply side electrode bodies 16a and 16b. Therefore, it is possible to suppress the power supply device side electrode bodies 16a and 16b from becoming high temperature, and it is possible to suppress the components around the electrodes 10a and 10b from being easily deteriorated. .

[0127] In addition, according to the method for manufacturing a joined body according to Embodiment 1, the thermal conductivity of the conductive felts 14a and 14b is set to 1/10 or less of the thermal conductivity of the workpiece-side electrode bodies 12a and 12b. The heat generated in the metal members Wa and Wb and the work-side electrode bodies 12a and 12b can be greatly suppressed from moving to the power supply apparatus-side electrode bodies 16a and 16b. In addition, by making the electrical resistivity of the conductive felts 14a and 14b more than five times the electrical resistivity of the workpiece side electrode bodies 12a and 12b, a large amount of heat can be generated in the conductive felts 14a and 14b. Made possible

[0128] Also, according to the method of manufacturing the joined body according to Embodiment 1, the conductive felts 14a and 14b are made of carbon felt having a force and a density of 0.2 g / cm ³ or less. , Wb and the heat generated by the workpiece side electrode bodies 12a, 12b can be greatly suppressed from transferring to the power supply side electrode bodies 16a, 16b, and a large amount of heat can be generated by the conductive felts 14a, 14b. Can be generated. [0129] Further, according to the method for manufacturing the joined body according to the first embodiment, since the workpiece side electrode bodies 12a and 12b are made of a carbon material, the heat resistance of the workpiece side electrode bodies 12a and 12b can be increased. It becomes.

[0130] Also, according to the manufacturing method of the joined body according to Embodiment 1, the power supply device side electrode bodies 16a and 16b are made of a carbon material, so that the heat resistance of the power supply device side electrode bodies 16a and 16b is increased. Is possible.

[0131] Also, according to the method for manufacturing the joined body according to the first embodiment, the thickness of the conductive felts 14a and 14b is smaller than the thickness of the workpiece-side electrode bodies 12a and 12b. As a result, the heat resistance of the metal members Wa and Wb is not reduced due to the increase in electrical resistance.

[0132] Also, according to the method for manufacturing the joined body according to Embodiment 1, the power device side electrode body 16a has a structure in which the flat plates 18a to 18a are stacked, and the power device side electrode body 16b is a flat plate. 18b ~

1 3 1

Since 18b has a laminated structure, the number of flat plates 18a ~; 18a, 18b ~;

3 1 3 1 3 By reducing the distance, it becomes possible to change the distance between the pair of electrodes 10a, 10b, and to easily arrange the metal members of various thicknesses between the pair of electrodes 10a, 10b. Is possible.

[0133] Also, according to the method for manufacturing a joined body according to Embodiment 1, the metal members Wa and Wb are energized and heated in a state where the pair of electrodes 10a and 10b are pressed so as to approach each other. , 10b and the metal members Wa, Wb become close, and the contact resistance between the electrodes 10a, 10b and the metal members Wa, Wb hardly fluctuates, so that stable energization heating can be performed.

Yes

[0134] Also, according to the method of manufacturing the joined body according to Embodiment 1, the metal members Wa and Wb are energized and heated while the power supply device 30 side of the pair of electrodes 10a and 10b is cooled. It is possible to suppress the temperature of the part on the power supply device 30 side in a and 10b from rising to an unfavorable temperature, and to further suppress deterioration of components around the electrodes 10a and 10b. It becomes a storehouse.

[0135] In addition, according to the method for manufacturing a joined body according to Embodiment 1, the metal members Wa and Wb are energized and heated by flowing a Nors current through the metal members Wa and Wb. The efficiency can be further greatly increased. [0136] In addition, according to the method for manufacturing a joined body according to Embodiment 1, as described above, the metal member preparation step, the metal member arrangement step, and the energization heating step are included in this order. As a result, the metal members Wa and Wb can be energized and heated with high heating efficiency, so that it is possible to join the metal members Wa and Wb with much less power than before, and the metal members The time required to join W a and Wb can be greatly shortened, and the size of the metal members Wa and Wb is large! It becomes possible to do.

[0137] In addition, according to the method for manufacturing a joined body according to Embodiment 1, it is possible to electrically heat the metal members Wa and Wb with high! / And heating efficiency, and thus the metal member Wa at a sufficiently high temperature. , Wb can be bonded, and a high-quality bonded body Pj can be manufactured.

[0138] Further, according to the method for manufacturing a joined body according to Embodiment 1, the metal members Wa and Wb can be energized and heated with high! / And heating efficiency, so that the joined body can be manufactured at low manufacturing cost. The ability to produce Pj becomes S Kurakura.

[Embodiment 2]

Embodiment 2 describes a case where the workpiece energization heating method of the present invention is applied to a joined body manufacturing method (joint body manufacturing method according to Embodiment 2) in which a plurality of metal members are joined to manufacture a joined body. It is embodiment to do.

[0140] FIG. 4 is a diagram showing a workpiece energization heating apparatus 200 used in the method for manufacturing a joined body according to the second embodiment. In FIG. 4, the same members as those described in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

[0141] The method for manufacturing a joined body according to the second embodiment is basically a method for manufacturing a joined body including an electric heating process similar to the method for manufacturing the joined body according to the first embodiment. This configuration is different from that in the case of the joined body manufacturing method according to the first embodiment. That is, in the method for manufacturing a joined body according to the second embodiment, as shown in FIG. 4, even if the pair of electrodes 210a and 210b is misaligned, the three phenolic pieces 215a to 215a and 215b to 215b Laminated

1 3 1 3

The conductive felts 214a and 214b having the above structure are used.

[0142] As described above, the method for manufacturing the joined body according to Embodiment 2 differs from the method for producing the joined body according to Embodiment 1 in the configuration of the conductive felt, but the structure of the joined body according to Embodiment 1 is different. As in the case of the manufacturing method, the thermal conductivity lower than that of the workpiece side electrode bodies 12a and 12b and the side of the workpiece are set between the workpiece side electrode bodies 12a and 12b and the power supply side electrode bodies 16a and 16b as a pair of electrodes. Conductive felt 214a, 214b force S with higher electrical resistivity than the electrode bodies 12a, 12b S Because the arranged electrodes 210a, 210b are used, the heat generated in the metal members Wa, Wb and the workpiece side electrode bodies 12a, 12b Can be suppressed from moving to the power supply device side electrode bodies 16a and 16b, and a large amount of heat can be generated in the conductive felts 214a and 214b. As a result, the temperature of the metal members Wa and Wb can be easily increased as compared with the conventional case, and the heating efficiency of the metal members Wa and Wb can be significantly increased as compared with the conventional case.

[0143] In addition, according to the method for manufacturing a joined body according to Embodiment 2, the conductive felts 214a and 214b have a structure in which three pieces of phenolate 215a to 215a and 215b to 215b are stacked.

1 3 1 3

Therefore, the heat generated in the metal members Wa and Wb and the work-side electrode bodies 12a and 12b can be further greatly suppressed from moving to the power supply apparatus-side electrode bodies 16a and 16b.

[0144] The method for manufacturing a joined body according to the second embodiment is the same as the method for producing a joined body according to the first embodiment except for the configuration of the conductive felt. Has the corresponding effect as it is among the effects of the method for manufacturing the joined body according to aspect 1

[Embodiment 3]

Embodiment 3 describes a case where the work energization heating method of the present invention is applied to a method for manufacturing a joined body in which a plurality of metal members are joined to produce a joined body (a joined body manufacturing method according to Embodiment 3). It is embodiment to do.

FIG. 5 is a view showing a work energization heating apparatus 300 used in the method for manufacturing a joined body according to the third embodiment. In FIG. 5, the same members as those described in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

[0147] The method for manufacturing a joined body according to the third embodiment is basically a method for manufacturing a joined body including an energization heating process similar to the method for producing the joined body according to the first embodiment. The configuration of the electrode body is different from that in the method for manufacturing the joined body according to the first embodiment. That is, in the method of manufacturing the joined body according to the third embodiment, as shown in FIG. 5, even if the pair of power supply side electrode bodies 316a and 316b is displaced, the three flat plates 318a to 318a, 318b—31 The plane size of 8b gradually increases toward the workpiece side electrode body 312a, 312b.

Three

The The plane sizes of the work side electrode bodies 312a and 312b and the conductive phenols 314a and 314b are the same as the plane sizes of the flat plates 318a and 318b.

As described above, the method for manufacturing a joined body according to the third embodiment differs from the method for producing a joined body according to the first embodiment in the configuration of the power supply side electrode body, but the joined body according to the first embodiment. As in the case of the manufacturing method of the above, as a pair of electrodes, between the workpiece side electrode bodies 312a, 312b and the power supply apparatus side electrode bodies 316a, 316b, the thermal conductivity lower than that of the workpiece side electrode bodies 12a, 12b and the workpiece. Since the electrodes 310a and 310b in which the conductive felts 314a and 314b having higher electrical resistivity than the side electrode bodies 12a and 12b are used are used, the heat generated by the metal members Wa and Wb and the workpiece side electrode bodies 312a and 312b Can be prevented from moving to the power supply device side electrode bodies 316a and 316b, and a large amount of heat can be generated in the conductive felts 314a and 314b. As a result, the temperature of the metal members Wa and Wb can be significantly increased than before, and the heating efficiency of the metal members Wa and Wb can be significantly increased as compared with the conventional case.

[0149] Further, according to the method of manufacturing the joined body according to the third embodiment, the flat surfaces of the flat plates 318a to 318a and 318b to 318b even if the pair of power supply device side electrode bodies 316a and 316b is displaced. Size

1 3 1 3

Is gradually increased toward the workpiece side electrode bodies 312a and 312b.Therefore, the power supply in the power supply side electrode bodies 316a and 316b and the plane size of the flat plates 318a and 318b on the apparatus 30 side are changed.

3 3

Even if not, the planar size of the workpiece side electrode bodies 312a and 312b can be increased, and the metal members Wa and Wb having a large horizontal plane size can be energized and heated.

[0150] Note that the manufacturing method of the joined body according to the third embodiment is the same as the manufacturing method of the joined body according to the first embodiment except for the configuration of the power device side electrode body.

The corresponding effects of the manufacturing method of the joined body according to Embodiment 1 are maintained as they are.

[Embodiment 4]

Embodiment 4 describes the case where the work energization heating method of the present invention is applied to a method for manufacturing a joined body in which a plurality of metal members are joined to produce a joined body (a joined body manufacturing method according to Embodiment 4). It is embodiment to do. FIG. 6 is a view for explaining the workpiece energization heating apparatus 400 used in the joined body manufacturing method according to the fourth embodiment. FIG. 7 is a view for explaining the heat insulating housing 470. In FIG. 6, the same members as those described in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

[0153] The method for manufacturing a joined body according to the fourth embodiment is basically a method for manufacturing a joined body including an energization heating process similar to the method for manufacturing the joined body according to the first embodiment. , Different from the method for manufacturing the joined body according to Embodiment 1 in that a heat insulating housing is arranged around W b. That is, in the method of manufacturing the joined body according to the fourth embodiment, as shown in FIG. 6, the metal members Wa and Wb are energized and heated with the heat insulating housing 470 disposed around the metal members Wa and Wb. It is said.

[0154] As shown in FIG. 7, the heat insulating housing 470 is made of a substantially cylindrical thin stainless steel plate, and has a slit 474 formed therein. The heat insulating housing 470 has a carbon felt lining 472.

[0155] Thus, the method for manufacturing a joined body according to Embodiment 4 differs from the method for producing a joined body according to Embodiment 1 in that a heat insulating housing is disposed around the metal members Wa and Wb. As in the case of the method of manufacturing the joined body according to Embodiment 1, conductive felts 14a and 14b are provided between the workpiece side electrode bodies 12a and 12b and the power supply side electrode bodies 16a and 16b as a pair of electrodes. Since the arranged electrodes 10a and 10b are used, it is possible to suppress the heat generated in the metal members Wa and Wb and the workpiece side electrode bodies 12a and 12b from moving to the power supply side electrode bodies 16a and 16b. In addition, it is possible to generate a large amount of heat in the conductive felts 14a and 14b. As a result, the temperature of the metal members Wa and Wb can be easily increased significantly compared to the conventional case, and the heating efficiency of the metal members Wa and Wb can be significantly increased as compared with the conventional case.

[0156] In addition, according to the method for manufacturing a joined body according to the fourth embodiment, since the heat insulating housing 470 having the carbon felt lining 472 exists, the heat generated in the metal members Wa and Wb is surrounded by the surroundings. Since it is possible to suppress the radiation to the space, the metal members Wa and Wb can be more easily heated than before, and the heating efficiency of the metal members Wa and Wb can be further greatly increased. It becomes possible.

[0157] Further, according to the joined body manufacturing method according to the fourth embodiment, the carbon felt lining 47 The heat insulating housing 470 having 2 can suppress the heat generated in the metal members Wa and Wb from being radiated to the surrounding space. (For example, the vacuum chamber 40) can be prevented from being easily deteriorated.

[0158] Also, according to the method of manufacturing the joined body according to the fourth embodiment, since the slit portion 474 is formed in the heat insulating housing 470, the metal members Wa and Wb are covered with the heat insulating housing 470. However, the state of the metal members Wa and Wb can be observed through the slit portion 474.

[0159] Also, according to the method of manufacturing the joined body according to Embodiment 4, since the slit portion 474 is formed in the heat insulating housing 470, the thermocouple for measuring the workpiece temperature is applied to the metal members Wa and Wb. In the case of the arrangement, the thermocouple wiring can be drawn out of the heat insulating housing 470 through the slit portion 474, and the thermocouple wiring can be easily routed.

[0160] The manufacturing method of the joined body according to the fourth embodiment is the same as the manufacturing method of the joined body according to the first embodiment, except that a heat insulating housing is disposed around the metal members Wa and Wb. Since it is a manufacturing method of a joined body, it has the corresponding effect as it is among the effects of the manufacturing method of the joined body according to Embodiment 1.

[Embodiment 5]

Embodiment 5 describes the case where the work energization heating method of the present invention is applied to a method for manufacturing a joined body in which a plurality of metal members are joined to produce a joined body (a joined body manufacturing method according to Embodiment 5). It is embodiment to do.

FIG. 8 is a view showing a work energization heating apparatus 500 used in the method for manufacturing a joined body according to the fifth embodiment. In FIG. 8, the same members as those described in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

[0163] The method for manufacturing a joined body according to Embodiment 5 is basically a method for producing a joined body including an energization heating step similar to the method for producing a joined body according to Embodiment 1, but includes a pair of electrodes. This is different from the case of the joined body manufacturing method according to Embodiment 1 in that a carbon sheet is disposed between 10a, 10b and the metal members Wa, Wb. That is, the method of manufacturing the joined body according to Embodiment 5 In the method, as shown in FIG. 8, the metal members Wa and Wb are energized and calo-heated with the carbon sheets 582a and 582b disposed between the pair of electrodes 10a and 10b and the metal members Wa and Wb, respectively. Yes. A carbon sheet (thickness: about 0.2 mm) manufactured by Toyo Tanso Co., Ltd. was used as the carbon sheet.

[0164] Thus, in the method for manufacturing a joined body according to Embodiment 5, the method for producing the joined body according to Embodiment 1 is different from that in the carbon sheet between the pair of electrodes 10a and 10b and the metal members Wa and Wb. As in the case of the method of manufacturing the joined body according to the first embodiment, the pair of electrodes is disposed between the workpiece side electrode bodies 12a and 12b and the power supply side electrode bodies 16a and 16b. Use of electrodes 10a and 10b with conductive felts 14a and 14b placed on them prevents the heat generated by metal members Wa and Wb and workpiece side electrode bodies 12a and 12b from moving to power supply side electrode bodies 16a and 16b It is also possible to generate a large amount of heat in the conductive felts 14a and 14b. As a result, the temperature of the metal members Wa and Wb is much easier to raise than before, and the heating efficiency of the metal members Wa and Wb can be made much higher than before.

[0165] Further, according to the method of manufacturing the joined body according to Embodiment 5, the carbon sheets 582a and 582b having high lubricity are disposed between the pair of electrodes 10a and 10b and the metal members Wa and Wb, respectively. Thus, since the metal members Wa and Wb are electrically heated, it is possible to suppress the electrodes 10a and 10b and the metal members Wa and Wb from being seized.

[0166] Note that the method of manufacturing the joined body according to the fifth embodiment is the same as that of the first embodiment except that the carbon sheets 582a and 582b are disposed between the pair of electrodes 10a and 10b and the metal members Wa and Wb. Since the workpiece energization heating method is the same as in the case of the method for manufacturing a body, the corresponding effect among the effects of the method for manufacturing a bonded body according to Embodiment 1 remains as it is.

[Embodiment 6]

Embodiment 6 is a method for producing a sintered body (a method for producing a sintered body according to Embodiment 6) in which a sintered body is produced by energizing and heating a powder for a sintered body. This is an embodiment for explaining the case of application.

[0168] FIG. 9 is a flowchart for explaining a method for manufacturing a sintered body according to the sixth embodiment. FIG. 10 is a view for explaining the method of manufacturing the sintered body according to the sixth embodiment. The Fig. 10 (a) is a diagram showing a powder preparation step S610 for a sintered body, Fig. 10 (b) is a diagram showing a powder arrangement step S620 for a sintered body, and Fig. 10 (c) is an electric heating step S630. FIG. 10 (d) is a diagram showing a sintered body Ps manufactured by the method for manufacturing a sintered body according to Embodiment 6. In FIG. 10 (b) and FIG. 10 (c), the same members as those described in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. In FIGS. 10 (b) and 10 (c), in order to simplify the drawings, a pair of electrodes 10a, 10b, a power supply device 30, wiring 32, a sintered body forming jig (cylindrical shape) Only the upper punch Ta, the cylindrical lower punch Tb, the cylindrical sintering mold Tc), and the sintered powder Ws are shown.

[0169] A method for manufacturing a sintered body according to Embodiment 6 uses a workpiece energization heating apparatus 600 (work energization heating apparatus 600 according to Embodiment 6) shown in FIGS. 10 (b) and 10 (c). For the sintered body by passing a current through the powder Ws for the sintered body with the powder Ws for the sintered body as a work placed between the pair of electrodes 10a, 10b electrically connected to the power supply device 30 This is a method for manufacturing a sintered body, in which the powder Ws is energized and heated to manufacture a sintered body Ps (see FIG. 10 (d)).

[0170] In the workpiece energization heating apparatus 600 according to the sixth embodiment, the illustration is omitted here.

1S It has the same configuration as the workpiece energization heating apparatus 100 according to the first embodiment. That is, the work energization heating device 600 according to Embodiment 6 includes the power supply device 30, the pair of electrodes 10a and 10b electrically connected to the power supply device 30, and the pair of electrodes 10a and 10b. A vacuum chamber 40; a pair of cooling bodies 20a, 20b that cool the pair of electrodes 10a, 10b; and a pressing device 50 that presses the pair of electrodes 10a, 10b toward each other. This is a sintering apparatus that sinters the sintered powder Ws by energizing and heating the sintered powder Ws disposed therebetween.

[0171] As shown in Fig. 9, the method for manufacturing a sintered body according to Embodiment 6 includes a sintered body powder preparation step S610, a sintered body powder arrangement step S620, and an electric heating step S630. Include in this order. Hereinafter, these steps will be described in order.

[0172] 1. Powder preparation process for sintered compact S610

First, a powder Ws for sintered bodies is prepared as a workpiece (see Fig. 10 (a)). Fig. 10 (a) shows a state in which the weighed powder Ws for sintered body is put in a container.

[0173] 2. Powder placement process for sintered compact S 620 Next, using a metal sintered body forming jig (a cylindrical upper punch Ta, a cylindrical lower punch Tb, and a cylindrical sintering die Tc), a pair of electrodes 10a, 10b The sintered powder Ws is placed between them (see Fig. 10 (b)).

[0174] 3. Electrical heating process S 630

Next, by passing an electric current through the sintered body powder Ws, the sintered body powder Ws is energized and heated to sinter the sintered body powder Ws (see FIG. 10 (c)).

[0175] By performing the above steps, the sintered body Ps can be manufactured (see FIG. 10 (d)).

[0176] As described above, the method for manufacturing a sintered body according to Embodiment 6 described above includes the powder preparation step S610 for the sintered body, the powder placement step S620 for the sintered body, and the electric heating step S630. Include in this order. As a result, it becomes possible to heat and heat the sintered powder Ws with high heating efficiency. Therefore, it is possible to sinter the sintered powder Ws with significantly less electric power than before, and to sinter the sintered powder Ws. It is possible to significantly reduce the time required to sinter the compacted powder Ws. Furthermore, even when producing a large size sintered body Ps, it is sintered at a sufficiently high temperature. It becomes possible.

[0177] In addition, according to the method for manufacturing a sintered body according to Embodiment 6, it becomes possible to energize and heat the powder Ws for a sintered body with high heating efficiency, so that the sintered body is used at a sufficiently high temperature. Powder Ws can be sintered, and high-quality sintered Ps can be produced.

[0178] Further, according to the method for manufacturing a sintered body according to Embodiment 6, it becomes possible to sinter the powder Ws for a sintered body with high heating efficiency, so that the sintered body can be manufactured at low manufacturing cost. Ps can be manufactured.

[Embodiment 7]

Embodiment 7 is a sintered body having a high degree of sintering, in which the sintered body is manufactured by energizing and heating the powder for a sintered body, and then heating the sintered body again by energizing and heating the sintered body. 5 is an embodiment for explaining a case where the present invention is applied to a method for manufacturing a sintered body (a method for manufacturing a sintered body according to Embodiment 7).

FIG. 11 is a flowchart for explaining the method for manufacturing a sintered body according to the seventh embodiment. FIG. 12 is a view for explaining the method of manufacturing the sintered body according to the seventh embodiment. Fig. 12 (a) is a diagram showing a sintered body Ps obtained by carrying out the electric heating step S730. FIG. 12 (b) is a diagram showing the sintered body arranging step S740, FIG.12 (c) is a diagram showing the second energization heating step S750, and FIG.12 (d) is a diagram showing the sintering according to the seventh embodiment. FIG. 3 is a view showing a sintered body Ps ′ manufactured by a method for manufacturing a bonded body. In FIG. 12 (b) and FIG. 12 (c), the same members as those described in the first and sixth embodiments are denoted by the same reference numerals, and detailed description thereof is omitted. Further, in FIG. 12 (b) and FIG. 12 (c), only the pair of electrodes 10a and 10b, the power supply device 30, the wiring 32, and the sintered body Ps are shown in order to simplify the drawing.

[0181] A method for manufacturing a sintered body according to Embodiment 7 uses a workpiece energization heating device 600 described in Embodiment 6 to connect a pair of electrodes 10a, 10b electrically connected to power supply device 30. In addition, the sintered body powder Ws is energized and heated by passing an electric current through the sintered body powder Ws in a state where the sintered body powder Ws is disposed as a workpiece, and the sintered body Ps (FIG. 12 (a)). After manufacturing, the sintered body Ps is energized and heated by passing a current through the sintered body Ps with the sintered body Ps placed between the pair of electrodes 10a and 10b. This is a method of manufacturing a joined body for manufacturing a sintered body Ps ′ having a high thickness (see FIG. 12 (d)).

[0182] The method for manufacturing a sintered body according to Embodiment 7 includes, as shown in FIG. 11, a powder preparation process S710 for a sintered body, a powder placement step S720 for the sintered body, an electric heating step S730, The sintered body arranging step S740 and the second electric heating step S750 are included in this order. Sintered powder preparation step S710 to energization heating step S730 is similar to the sintered body powder preparation step S610 to energization heating step S630 described in the sixth embodiment, and detailed description thereof will be omitted. Hereinafter, the “sintered body arranging step S740” and the “second electric heating step S750” will be described.

[0183] "Sintered body placement process S 740"

After the electric heating step S730, the sintered body Ps is disposed between the pair of electrodes 10a and 10b (see FIG. 12 (b)).

[0184] "Second electric heating process S 750"

By passing an electric current through the sintered body Ps, the sintered body Ps is heated by energization (see Fig. 12 (c)).

[0185] By performing the above steps, a sintered body Ps' having a high degree of sintering can be produced (see Fig. 12 (d)).

[0186] According to the method for manufacturing a sintered body according to Embodiment 7 including the above steps, the degree of sintering of the sintered body Ps can be further increased, and a high-quality sintered body Ps' is manufactured. Became possible [0187] In order to confirm the effect of the work energization heating method of the present invention, the following tests were conducted.

[Test Example 1]

In Test Example 1, the metal members Wa and Wb as works were energized and heated using the work energization heating method according to Example 1, Comparative Example 1 and Comparative Example 2 (details will be described later), and the predetermined time was exceeded. The temperature and power consumption of the metal members Wa and Wb at the time were compared.

FIG. 13 is a diagram for explaining the work energization heating method in Test Example 1. FIG.

FIG. 13 (a) is a view for explaining the work energization heating method according to Example 1, and FIG. 13 (b) is a view for explaining the work energization heating method according to Comparative Example 1. FIG. 13 (c) is a diagram for explaining the work energization heating method according to Comparative Example 2. 13 (a) to 13 (c), the same members as those in FIG. 1 are denoted by the same reference numerals and detailed description thereof is omitted. 13A to 13C, only the pair of electrodes 10a to 10f, the power supply device 30, the wiring 32, and the metal members Wa and Wb are shown in order to simplify the drawing.

[0190] The work energization heating method according to Example 1 was performed using the work energization heating apparatus 102 having the same configuration as the work energization heating apparatus 100 according to Embodiment 1 described above. The electric current heating method according to Comparative Example 1 was performed using the workpiece electric current heating device 104, and the electric current heating method according to Comparative Example 2 was performed using the workpiece electric current heating device 106. The work energization heating devices 104 and 106 are basically different in the configuration of a force pair electrode having substantially the same configuration as the work energization heating device 102. The configuration of the pair of electrodes in Example 1, Comparative Example 1 and Comparative Example 2 is as follows.

[0191] Example 1

As shown in FIG. 13 (a), the pair of electrodes 10a and 10b in the first embodiment includes the workpiece side electrode bodies 12a and 12b, the conductive felts 14a and 14b, and the power supply side electrode bodies 16a and 16b in this order. It has a laminated structure. Carbon felt is used as the conductive felts 14a and 14b.

[0192] Comparative Example 1

As shown in FIG. 13 (b), the pair of electrodes 10c and 10d in Comparative Example 1 has a structure in which workpiece side electrode bodies 12a and 12b and power supply side electrode bodies 16a and 16b are stacked in this order. You The The pair of electrodes 10c, 10d in Comparative Example 1 has the same configuration as the electrode in the conventional work energization heating method described in Patent Document 1 (see FIG. 4 of Patent Document 1).

[0193] Comparative Example 2

As shown in FIG. 13 (c), the pair of electrodes 10e, 10f in Comparative Example 2 is composed of the workpiece side electrode bodies 12a, 12b, the carbon tip layers 14e, 14f, and the power supply side electrode bodies 16a, 16b in this order. It has a laminated structure. The pair of electrodes 10e and 10f in Comparative Example 2 is the same as the electrode in the conventional work energization heating method described in the above-mentioned JP-A-2005-230823 (see FIG. 1 of JP-A-2005-230823). However, the thickness of the carbon tip layer is thinner than that of the conventional work energization heating method). As the carbon chip layers 14e and 14f, carbon sheets manufactured by Toyo Tanso Co., Ltd. were cut and chipped and laminated.

[0194] The test conditions were as follows:

(1) As the metal members Wa and Wb, use two stainless steel SUS420 (size: 50mm x 50mm x 10mm).

(2) The current (working current) flowing through the metal members Wa and Wb is a constant current of 1500A, and the voltage (measurement voltage) between the pair of electrodes at this time is measured.

(3) The heating time (work heating time) of the metal members Wa and Wb is 40 minutes, and the temperature of the metal members Wa and Wb (work temperature) is measured every 10 minutes.

[0195] Table 1 is a table showing test results in Example 1, Comparative Example 1, and Comparative Example 2. In Table 1, the power consumption (kWh) is

It was calculated by “work current (A) X average measurement voltage (V) X work heating time (h) / 1000”.

The average measured voltage in Example 1 was 3.3 V, the average measured voltage in Comparative Example 1 was 2.0 V, and the average measured voltage in Comparative Example 2 was 2.2 V.

[0196] [Table 1] Heating time (minutes)

0 1 0 20 30 40 Work temperature (° c) 26 635 725 745 763 Example 1

Power consumption (kWh) 0 0. 8 1. 7 2. 5 3. 3 Work temperature (° c) 26 345

Comparative Example 1

Power consumption (kWh) 0 1.0

Comparative Example 2 ヮ Cake temperature (° c) 26 326 440 496 51 6

Power consumption (kWh) 0 0. 6 1. 1 1. 7 2. 2

FIG. 14 is a graph showing the test results in Test Example 1. Fig. 14 (a) is a graph showing the relationship between the workpiece heating time and the workpiece temperature in Test Example 1, and Fig. 14 (b) is a graph showing the relationship between the power consumption and the workpiece temperature in Test Example 1. is there.

[0198] First, the easiness of raising the temperature of the metal members Wa, Wb

Compare the workpiece temperature when the heating time is 40 minutes (see Table 1 and Fig. 14 (a)). The workpiece temperature of Comparative Example 1 was 420 ° C, and the workpiece temperature of Comparative Example 2 was 516 ° C. In contrast, the cake temperature of Example 1 was 763 ° C. This force also indicates that the metal members Wa and Wb are much easier to raise the temperature in Example 1 than in Comparative Example 1 and Comparative Example 2.

[0199] Next, the heating efficiency of the workpiece is compared with the workpiece temperature at the power consumption of 2. OkWh.

(Refer to Table 1 and Fig. 14 (b). Note that the virtual spring m in Fig. 14 (b) is 2. OkWhM.

〇 ο This is a line indicating the power consumption. ). The workpiece temperature of Comparative Example 1 was 420 ° C, and the workpiece temperature of Comparative Example 2 was about 510 ° C. In contrast, the workpiece temperature of Example 1 was about 730 ° C. From this, it can be seen that the heating efficiency of the metal members Wa and Wb of Example 1 is significantly higher than the heating efficiency of the metal members Wa and Wb of Comparative Example 1 and Comparative Example 2.

FIG. 15 is a drawing-substituting photograph showing the electrically heated state of the metal members Wa and Wb and the electrodes 10a to 10f in Test Example 1.

[0201] FIG. 15 (a) shows the current heating state of the metal members Wa and Wb and the electrodes 10a and 10b when the current heating is performed for 40 minutes in Example 1 (working temperature is 763 ° C.). This is a drawing substitute photo.

[0202] FIG. 15 (b) shows the current heating state of the metal members Wa, Wb and the electrodes 10c, 10d when the current heating is performed for 40 minutes in Comparative Example 1 (working temperature is 420 ° C.). Drawing substitute copy Is true.

[0203] Fig. 15 (c) shows 40 minutes of energization heating in Comparative Example 1, followed by 50 minutes of energization heating while gradually increasing the work current to 280 OA (90 minutes total energization heating) FIG. 6 is a drawing-substituting photograph showing the current heating state (working temperature is 648 ° C.) of the metal members Wa and Wb and the electrodes 10c and 10d when the above is performed.

In FIG. 15 (c), the member visible above the electrode 10c and below the electrode 10d is a cooling body protection plate (see reference numerals 24a and 24b in FIG. 1).

[0204] FIG. 15 (d) shows the current heating state (workpiece temperature is 516 ° C.) of the metal members Wa and Wb and the electrodes 10e and 10f when the current sample is heated for 40 minutes in Comparative Example 2. This is a drawing substitute photo.

[0205] Fig. 15 (e) shows a case of conducting heating for 40 minutes in Comparative Example 2, followed by further heating for 30 minutes while gradually increasing the workpiece current to 2800 A (heating for 70 minutes in total). FIG. 6 is a drawing-substituting photograph showing the current heating state (working temperature is 724 ° C.) of the metal members Wa and Wb and the electrodes 10e and 10f when the above is performed.

In FIG. 15 (e), the member visible above the electrode 10e and below the electrode 10f is a cooling body protection plate (see reference numerals 24a and 24b in FIG. 1).

[0206] In Comparative Example 1 and Comparative Example 2, the reasons for conducting the electrical heating for 90 minutes in total and for conducting the electrical heating for 70 minutes in Comparative Example 2 were as follows: This is for observing the current heating state of the metal members Wa and Wb and the electrodes 10a to 10f in a high temperature state.

First, in Example 1, Comparative Example 1 and Comparative Example 2, the current heating states of the metal members Wa and Wb and the electrodes 10a to 10f when the current heating is performed for 40 minutes are compared (FIG. 15 (a)). (See Figure 15 (b) and Figure 15 (d).)

In both Comparative Example 1 and Comparative Example 2, since the work temperature is low, no light emission is observed in any of the metal members Wa and Wb and the electrodes 10c to 10f. On the other hand, in Example 1, since the workpiece temperature is high, it is observed that the metal members Wa and Wb and the workpiece-side electrode bodies 12a and 12b emit light brightly. From this, it can be seen that in Example 1, the metal members Wa and Wb are much easier to be heated than in Comparative Example 1 and Comparative Example 2. [0209] Next, in Example 1, Comparative Example 1 and Comparative Example 2, the energized and heated states of the metal members Wa and Wb and the electrodes 10a to 10f in a high temperature state are compared (FIGS. 15A and 15C). ) And Figure 15 (e)).

[0210] In both Comparative Example 1 and Comparative Example 2, it is observed that the electrodes 10c to 10f as a whole emit light brightly in addition to the metal members Wa and Wb. This means that in both Comparative Example 1 and Comparative Example 2, heat generated in the metal members Wa and Wb and the workpiece side electrode bodies 12a and 12b is transferred to the power supply side electrode bodies 16a and 16b. Wow, ivy.

On the other hand, in Example 1, it is observed that only the metal members Wa and Wb and the work-side electrode bodies 12a and 12b emit light brightly as is clear from FIG. 15 (a). In the power supply side electrode bodies 16a and 16b, almost no light emission is observed. Because of this, the presence of the conductive felt 14a, 14b force S, the heat generated in the metal members Wa, Wb and the workpiece side electrode bodies 12a, 12b is transferred to the power supply side electrode bodies 16a, 16b. What you are suppressing

[0212] [Test Example 2]

In Test Example 2, the temperatures of the metal members Wa and Wb when the metal members Wa and Wb as the cake were energized and heated using the work energization heating method according to Example 2 and Comparative Example 3 were compared.

[0213] The work energization heating method according to Example 2 and Comparative Example 3 was performed using the work energization heating apparatus having the same configuration as the single energization heating apparatus 100 according to Embodiment 1 described above. The test conditions are as follows.

[0214] (1) Two stainless steel SUS420 as metal members Wa and Wb (size: 50mm X 50mm

Use X 10mm.

(2) The pressure applied to the pair of electrodes shall be a constant pressure of 0.3 MPa.

(3) The current (working current) flowing through the metal members Wa and Wb is a constant current of 1500A.

(4) Heat the metal members Wa and Wb (work heating time) for 60 minutes, and measure the temperature of the metal members Wa and Wb (work temperature) every minute.

[0215] However, in the work energization heating method according to Example 2, the energization was performed using two metal members each having an arithmetic average roughness Ra of 0.1 m as the metal members Wa and Wb. Heat was done. In the work energization heating method according to Comparative Example 3, each metal member Wa

, Wb was used for current heating using two metal members with an arithmetic mean roughness Ra of 0.01 m on the planned joining surface.

FIG. 16 is a graph showing the test results in Test Example 2. In FIG. 16, the solid line shows the test results for Example 2 and the broken line shows the test results for Comparative Example 3.

[0217] As is apparent from Fig. 16, it was found that the metal members Wa and Wb are more likely to rise in temperature when the metal members with a somewhat rough arithmetic mean roughness Ra (0.1 μm) are used. .

[Test Example 3]

In Test Example 3, the temperatures of the metal members Wa and Wb when the metal members Wa and Wb as the cake were energized and heated using the work energization heating method according to Example 3 and Comparative Example 4 were compared.

[0219] The work energization heating method according to Example 3 and Comparative Example 4 was performed using the work energization heating apparatus having the same configuration as that of the single energization heating apparatus 100 according to Embodiment 1 described above. The test conditions are as follows.

[0220] (1) Two stainless steels SUS420 as metal members Wa and Wb (size: 50mm X 50mm

X 10mm). The arithmetic average roughness Ra of the planned joining surfaces of the metal members Wa and Wb is 0 • 1 μm.

(2) The current (working current) flowing through the metal members Wa and Wb is set to a constant current of 1500A.

(3) Heat the metal members Wa and Wb (work heating time) for 60 minutes and measure the temperature of the metal members Wa and Wb (work temperature) every minute.

[0221] However, in the work energization heating method according to Example 3, energization heating was performed under the condition that the pressure applied to the pair of electrodes was a constant pressure of 0.3 MPa. Further, in the single electric heating method according to Comparative Example 4, the electric heating was performed under the condition that the pressure applied to the pair of electrodes was a constant pressure of IMPa.

FIG. 17 is a graph showing the test results in Test Example 3. In FIG. 17, the solid line shows the test results for Example 3 and the broken line shows the test results for Comparative Example 4.

As is apparent from FIG. 17, it was found that the metal members Wa and Wb are more likely to rise in temperature when electric heating is performed under a condition where the pressure applied to the pair of electrodes is somewhat low (0.3 MPa). [Test Example 4]

In Test Example 4, the temperatures of the metal members Wa and Wb when the metal members Wa and Wb as the cake were energized and heated using the work energization heating method according to Example 4 and Comparative Example 5 were compared.

[0225] The workpiece energization heating method according to Example 4 and Comparative Example 5 was performed using the workpiece energization heating device having the same configuration as that of the single energization heating device 100 according to Embodiment 1 described above. The test conditions are as follows.

[0226] (1) Two stainless steel SUS420 as metal members Wa and Wb (size: 50mm X 50mm

(2) The heating time of the metal members Wa and Wb (work heating time) is 60 minutes, and the temperature of the metal members Wa and Wb (work temperature) is measured every minute.

[0227] However, in the work energization heating method according to Example 4, for the first 20 minutes, the pressure applied to the pair of electrodes was set to 0.3 MPa, and the current (working current) passed through the metal members Wa and Wb. For 40 minutes after that, the pressure applied to the pair of electrodes is IMPa pressure, and the current flowing through the metal members Wa and Wb (suck current) is 2000A. Electric heating was performed. In the work energization heating method according to Comparative Example 5, the pressure applied to the pair of electrodes is constant at 0.3 MPa over 60 minutes, and the current (work current) flowing through the metal members Wa and Wb is constant at 1500A. Electric heating was performed under the condition of current.

FIG. 18 is a graph showing the test results in Test Example 4. In FIG. 18, the solid line shows the test results for Example 4 and the broken line shows the test result of Comparative Example 5.

As is apparent from FIG. 18, even if the pressure applied to the pair of electrodes is increased during energization and heating for the purpose of obtaining a joined body having a sufficiently high joining force, the metal can be increased by increasing the current. It was obvious that the materials Wa and Wb could be heated sufficiently.

[Test Example 5]

In Test Example 5, the metal members Wa, Wb when the metal members Wa, Wb as the workpiece were energized and heated using the workpiece energization heating method according to Example 5, Example 6, and Comparative Example 6 The temperatures were compared.

[0231] The workpiece energization heating method according to Example 5, Example 6, and Comparative Example 6 is the embodiment described above.

The work energization heating apparatus having the same configuration as the work energization heating apparatus 100 according to 1 was used. The test conditions are as follows.

[0232] (1) As the metal members Wa and Wb, two metal members made of hot mold steel SKD61 and having a cooling water channel groove formed on the planned joining surface are used. (For example, see steel members 32 and 36 shown in Fig. 6 (a) of the pamphlet of International Publication No. 2007/108058). Arithmetic average roughness Ra of the planned joining surfaces of metal members Wa and Wb is 0.1 m.

Yes

[0233] (2) The metal members Wa and Wb are energized and heated to produce a joined body in which a cooling water channel is formed on the joining surface (see FIG. 6 (b) of the pamphlet). At this time, in the single energization heating method according to Comparative Example 6, the energization heating is performed under the condition that the pressure applied to the pair of electrodes for 60 minutes is a pressure of 0.3 MPa. On the other hand, in the work energization heating method according to Example 5, the energization heating is performed under the condition that the pressure applied to the pair of electrodes is 0.3 MPa for the first 20 minutes, and the pair for the subsequent 40 minutes. Conduction heating is performed under the condition that the pressure applied to the electrode is the pressure of IMPa. Further, in the electric current heating method according to Example 6, the electric heating is performed under the condition that the pressure applied to the pair of electrodes is 0.3 MPa for the first 20 minutes, and the pair for the subsequent 40 minutes. Conduct current heating under the condition that the pressure applied to the electrode is IMPa, and then increase the pressure applied to the pair of electrodes to 5 MPa immediately after the current heating process, and hold for 1 minute in that state.

[0234] (3) Thereafter, according to the method described in the pamphlet of International Publication No. 2007/108058 (see FIGS. 1 to 4 of the pamphlet), the obtained joined body is subjected to a homogenization step and a bonding strength strengthening step. To strengthen the bonding force in the bonded body (see Fig. 6 (c) and Fig. 6 (d) in the above pamphlet).

(4) Then, the joined body is cut to produce a mold (see Fig. 6 (e) in the pamphlet).

(5) After that, using the molding die as a resin molding die and die casting molding die, The durability as a fat molding die and a die casting die is evaluated.

[0235] Table 2 is a table showing test results in Test Example 5. In the column of Durability / Resin Mold in Table 2, the shot number until the resin mold is damaged when resin molding is performed using the resin mold is 10 times that of Comparative Example 6. In the above cases, “◎” was given as being able to withstand actual use. In addition, in the column of Durability / Die Casting Mold in Table 2, the number of shots until the die casting mold is damaged when die casting is performed using the die casting mold is 10 times that of Comparative Example 6. In the above case, an evaluation of “◯” was given, and an evaluation of “◎” was given that it could sufficiently withstand actual use when it was 10 times or more of Example 5. Also, in the overall evaluation column of Table 2, when the durability / die casting mold column is “◎”, an evaluation of “◎” is given, and the durability / die casting mold column is “◯”. The case was given a rating of “〇”.

[0236] [Table 2] Durability

Type Overall evaluation

Resin mold Die-cast mold

Example 5 ◎ 〇〇

Example 6 ◎ ◎ ◎

Comparative Example 6

[0237] As is clear from Table 2, the pressure applied to the pair of electrodes at the initial stage of the energization heating process is set relatively low (0.3 MPa), and is applied to the pair of electrodes at the latter stage of the energization heating process. It was found that by setting the pressure relatively high (IMPa), it is possible to obtain a bonded body with sufficiently high bonding strength. In addition, the pressure applied to the pair of electrodes in the initial stage of the electric heating process is set relatively low (0.3 MPa), and the pressure applied to the pair of electrodes in the latter stage of the electric heating process is set relatively high (IMPa). Furthermore, it was found that a bonded body with higher bonding strength can be obtained by applying a higher pressure (5 MPa) to the pair of electrodes after the current heating step.

[0238] The work energizing heating method, the joined body manufacturing method, the sintered body manufacturing method, and the work energizing heating apparatus of the present invention described above based on the above embodiments are described above. The present invention is not limited to the embodiments described above, and can be implemented in various modes without departing from the gist thereof. For example, the following modifications are possible.

(1) In the above embodiments, the force using carbon felt as the conductive felts 14a, 14b, 214a, 214b, 314a, 314b is not limited to this. For example, a conductive felt made of stainless fiber is used as the conductive felt.

(2) In each of the above embodiments, the force using the workpiece-side electrode bodies 12a, 12b, 312a, 312b made of a carbon material. The present invention is not limited to this. For example, a workpiece-side electrode body made of a metal material such as stainless steel can be used.

[0241] (3) In each of the above embodiments, the force using the power supply device side electrode bodies 16a, 16b, 316a, 316b made of a carbon material is not limited to this. For example, a power device side electrode body made of a metal material such as stainless steel can be used.

[0242] (4) In Embodiment 4 described above, the heat insulating housing 470 is formed with the slit portion 474, but the present invention is not limited to this. For example, the heat insulation housing has a window! /

[0243] (5) In Test Example 5 described above, the force shown in the example in which the pressure applied to the pair of electrodes is increased to 5 MPa immediately after the energization heating step is not limited to this. By setting the pressure applied to the pair of electrodes to 2 MPa or more immediately after the energization heating process, it is possible to manufacture a bonded body with extremely high bonding strength.

[0244] (6) The present invention can be suitably used in the case of manufacturing an assembly for manufacturing a molding die in which a heat exchange medium flow path such as a cooling water flow path is formed.

Explanation of symbols

[0245] 10a, 10b, 10c, 10d, lOe, l Of, 210a, 210b, 310a, 310b, 910a, 910b ... Electrode, 12a, 12b, 312a, 312b ... Work side electrode body, 14a, 14b, 214a, 214b, 314a, 314b… Conductive felt, 14e, 14f… Carbon tip, 16a, 16b, 316a, 316b… Power supply side electrode body, 18a to 18a, 18b to 18b, 318a to 318a, 318b to 318b…

1 3 1 3 1 3 1 3 Flat plate, 20a, 20b ... cooling body, 22a, 22b ... cooling medium flow path, 24a, 24b ... cooling body protection plate, 30, 930 ... power supply, 32 ... selfish wire, 40 , 940… Vacuum chamber, 50… Pressing device, 5 2 ... Hydraulic cylinder, 60 ... Vacuum pump, 215a to 215a, 215b to 215b ...

1 3 1 3

470… Insulation for insulation, 472… Inner lining, 474… Slit part, 100, 102, 104, 106, 200, 300, 400, 500, 600, 900… Work power outlet heating device, 582a, 582b… Carbon sheet, Pj: Bonded body, Ps, Ps': Sintered body, Ta: Upper punch, Tb: Lower punch, Tc: Mold for sintering, W, Wa, Wb ... Metal member, Ws ... Powder for sintered body

Claims

The scope of the claims

[1] A work energization heating method in which the work is energized and heated in a state where the work is disposed between a pair of electrodes electrically connected to the power supply device.

As at least one electrode of the pair of electrodes, the workpiece side electrode body and the workpiece side electrode body have lower! /, Thermal conductivity and higher than the workpiece side electrode body! /, And electrical resistivity. A work energization heating method, wherein the work is energized and heated using an electrode having a structure in which a conductive felt and a power supply side electrode body are laminated in this order.

[2] In the work energization heating method according to claim 1!

The thermal conductivity of the conductive felt is 1/10 or less of the thermal conductivity of the workpiece-side electrode body, and the electrical resistivity of the conductive felt is the electrical resistivity of the workpiece-side electrode body. A work energization heating method characterized by being 5 times or more.

[3] In the work energization heating method according to claim 1 or 2,

The method according to claim 1, wherein the conductive felt is made of carbon felt having a force and density of 0.2 g / cm ³ or less.

[4] In the work energization heating method according to any one of claims 1 to 3,

The conductive felt heating method, wherein the conductive felt has a structure in which a plurality of felt pieces are laminated.

[5] In the work energization heating method according to any one of claims 1 to 4,

A work energization heating method, wherein a thickness of the conductive felt is thinner than a thickness of the work side electrode body.

[6] In the work energization heating method according to any one of claims 1 to 5,

The work energization heating method, wherein the work side electrode body and the power supply side electrode body are made of a carbon material.

[7] In the work energization heating method according to any one of claims 1 to 6,

A work energization heating method, wherein the work is energized and heated in a state where a carbon sheet is disposed between the pair of electrodes and the work.

[8] In the work energization heating method according to any one of claims 1 to 7,

The power device side electrode body has a structure in which a plurality of flat plates are laminated. Work energization heating method.

In the work energization heating method according to claim 8,

The workpiece energization heating method, wherein a planar size of each flat plate in the power supply device side electrode body gradually increases toward the workpiece side electrode body.

In the work energization heating method according to any one of claims 1 to 9,

A work energization heating method, wherein the work is energized and heated in a state where a heat insulating housing is disposed around the work.

In the work energization heating method according to claim 10,

The method for energizing and heating a ceramic, wherein the heat insulating housing has a carbon felt lining.

The work energization heating method according to any one of claims 1 to 11;

As either electrode of the pair of electrodes, the workpiece side electrode body and the workpiece side electrode body have lower! /, Thermal conductivity and higher than the workpiece side electrode body! /, And electrical resistivity. A work energization heating method, wherein the work is energized and heated using an electrode having a structure in which a conductive felt and a power supply device side electrode body are laminated in this order.

A method for producing a joined body for producing a joined body using the work energization heating method according to any one of claims;

A metal member preparation step of preparing a plurality of metal members as a workpiece;

A metal member disposing step of disposing the plurality of metal members in a state where the surfaces to be joined are abutted between the pair of electrodes;

A method of manufacturing a joined body, comprising: an energization heating step in which the plurality of metal members are energized and heated to join the plurality of metal members in a state in which the pair of electrodes are pressed in a direction approaching each other. .

In the manufacturing method of the joined object according to claim 13,

The method for producing a joined body, characterized in that the arithmetic average roughness Ra of the planned joining surface of each metal member is 0.02 ^ 111-0.2111.

In the manufacturing method of the joined object according to claim 13 or 14,

In the initial stage of the energization heating step, a predetermined first pressure is applied to the pair of electrodes. The plurality of metal members are energized and heated while applying

In the latter stage of the energization heating process, the plurality of metal members are energized and heated in a state where a second pressure higher than the first pressure is applied to the pair of electrodes. .

[16] The method for producing a joined body according to any one of claims 13 to 15;

In the initial stage of the energization heating process! /, The plurality of metal members are electrically heated by a predetermined amount of current,

In the latter stage of the energization heating process, the plurality of metal members are energized and heated with a larger amount of current than in the initial stage of the energization heating process.

[17] In the method for producing a joined body according to claim 15 or 16,

A method for producing a joined body, wherein a pressure of 2 MPa or more is applied to the pair of electrodes at a later stage of the energization heating process or after the energization heating process.

[18] A method for producing a sintered body, wherein the sintered body is produced using the work energization heating method according to any one of claims;! -12.

A powder preparation process for a sintered body for preparing a powder for a sintered body as a workpiece,

The sintered body powder placement step of placing the sintered body powder between the pair of electrodes, and the sintered body powder being heated while the pair of electrodes are pressed toward each other. A method for producing a sintered body comprising an electric heating step for sintering the powder for a sintered body in this order.

[19] The method for producing a sintered body according to claim 18,

After the current heating step,

A sintered body arrangement step of arranging the sintered body between the pair of electrodes;

A method for producing a sintered body, further comprising a second current heating step of electrically heating the sintered body.

[20] a power supply;

A pair of electrodes electrically connected to the power supply device;

A vacuum chamber in which the pair of electrodes are installed,

In a work energization heating apparatus that energizes and heats a work placed between the pair of electrodes. And

At least one of the pair of electrodes has a work-side electrode body and a lower electrical conductivity than the work-side electrode body and a higher thermal conductivity and an electrical resistivity than the work-side electrode body. A work energization heating device characterized by having a structure in which a conductive felt and a power supply device side electrode body are laminated in this order.

[21] In the work energization heating device according to claim 20,

Either electrode of the pair of electrodes is a work-side electrode body and a conductivity lower than that of the work-side electrode body /, having a thermal conductivity and higher than that of the work-side electrode body, and having an electrical resistivity. A work energizing / heating apparatus characterized by having a structure in which a felt and a power supply side electrode body are laminated in this order.

[22] In the work electric heating apparatus according to claim 20 or 21,! /,

The work energization heating apparatus is a joining apparatus that energizes and heats a plurality of metal members as the work to join the plurality of metal members.

[23] In the work energization heating device according to claim 20 or 21,! /,

The workpiece energization heating apparatus is a sintering apparatus for energizing and heating the sintered body powder as the workpiece to sinter the sintered body powder.