Press-fit joining device and press-fit joining method

Abstract

To provide a press-fit joining device which enables joint of multiple shaft body parts to one metal member to be performed with high accuracy and enables improvement of productivity.SOLUTION: A press-fit joining device 100 joins a hole part 16 of a first member 11A and a second member 12A by press-fitting, and includes a power supply device 110, a pressing device 120, a lower platen 120, an upper platen 130, a pedestal electrode part 150, four compression mechanisms 160, four cylinder mechanisms 170, a switching part 112, and an elastic mechanism 122. When a cylinder 172 is connected to the compression mechanism 160, the compression mechanism 160 causes a compression electrode part 162 to protrude downward to join the first member 21A and the second member 22A to each other by press-fitting. When the compression mechanism 160 is returned to an original point, the cylinder 172 is disconnected to return a height position of the protruding compression electrode part 162 to an original point.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a press-fit welding apparatus and a press-fit welding method. [Background technology]

[0002] Conventionally, when manufacturing metal component parts for use in automobiles and the like, members are usually joined together by arc welding or the like. For example, when joining a shaft to a metal plate, the shaft is fitted into a hole provided in the metal plate, and the fitting portion with the shaft is welded all around or locally using a filler metal by arc welding or the like. In addition, joining by resistance welding, for example, spot welding or projection welding, or a method of joining members by caulking is also used.

[0003] However, the above-mentioned joining method has a problem that the heat of arc welding causes thermal deformation and the like, which causes thermal deterioration of the base material such as the metal plate and shaft, and dimensional distortion, which inevitably affects the accuracy. In this case, there is a problem that a lot of effort and cost is required for finishing processing after welding, such as adding post-processing after welding to improve the accuracy of the product and removing unnecessary filler material from the welded part.

[0004] In addition, the main resistance welding method is lap resistance welding, and in both cases, the joining is performed by forming a molten structure called a nugget at the joint. In this lap resistance welding method, the only way to strengthen the weld is to increase the number of nuggets, which results in problems such as thermal deterioration of the joining base material and an unavoidable impact on dimensional accuracy. In addition, in the case of fusion welding, although the joining strength is high, the thermal effect on the base material is wide, which causes a large impact on thermal deterioration and dimensional accuracy, and requires post-processing, which is expensive.

[0005] Therefore, the applicants have developed and put into practical use a press-in joining method in which an electric current is passed between the plate and the shaft while pressing the shaft against a hole in the plate with a predetermined pressure, generating electrical resistance heat at the joint between the plate and the shaft, and then press-fitting the shaft into the hole in the plate and joining the hole in the plate and the shaft through solid-state diffusion bonding (see, for example, Patent Document 1).

[0006] Fig. 20 is a diagram for explaining a conventional press-fit bonding method. In the conventional press-fit bonding method, as shown in Fig. 20, a "shaft body 903 having a predetermined press-fit margin between it and the hole 902 of the plate body 901" is pressed against a hole 902 of a plate body 901 with a predetermined pressure while a current is passed between the plate body and the shaft body, thereby generating electric resistance heat at the joint between the plate body 901 and the shaft body 903, press-fitting the shaft body 903 into the hole 902 of the plate body 901, and bonding the hole 902 of the plate body 901 and the shaft body 903 by solid-state diffusion bonding. In Fig. 20, reference numeral 904 denotes a lower electrode and reference numeral 905 denotes an upper electrode.

[0007] The conventional press-fit joining method is a method for press-fitting a plate body and a shaft body, which has good finishing precision, is excellent in strength, and is economically effective. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] JP 2001-353628 A Summary of the Invention [Problem to be solved by the invention]

[0009] Incidentally, metal component parts may require joining multiple metal shafts (shaft portions) to one metal member. In this case, it is possible to join multiple shaft portions collectively while passing an electric current through them at the same time. However, in this case, there is a problem that it is difficult to uniformly apply the electric current and pressure to the shaft portions, and it is difficult to join all the shaft portions with high quality. On the other hand, if the shaft portions are joined to the metal member one by one, the work becomes complicated, as it is necessary to position the metal member each time and transport the metal member, and there is a problem that it is difficult to increase productivity.

[0010] The present invention has been made to solve the above problems, and has an object to provide a press-fit joining device that can join multiple shaft portions to one metal member with high accuracy and increase productivity, and also to provide a press-fit joining method for such joining. [Means for solving the problem]

[0011] The press-fit welding apparatus of the present invention press-fits and joins the holes of a "first member having a plurality of holes" with the shaft portions of the second member by applying a current between the first member and the second member while pressing the shaft portions of a "second member having a shaft portion with a predetermined press-fit allowance between the holes of the first member" with a predetermined pressure against each of the holes of the "first member having a plurality of holes," and the press-fit welding apparatus includes a power supply unit, a lower platen, an upper platen disposed in a position opposite to the lower platen, a lifting unit for lifting and lowering the upper platen, and a press-fit welding device for pressing and welding the holes of the first member with the shaft portions of the second member. a plurality of pedestal electrode parts on an upper surface of which the first member can be placed, each of the pedestal electrode parts being connectable to one electrode of the power supply device, the pedestal electrode part having a shaft body portion accommodating hole for accommodating a part of the shaft body portion at a position overlapping with the hole portion when the first member is placed on the upper platen; and a plurality of pressure mechanisms arranged on a lower surface of the upper platen at positions facing the plurality of pedestal electrode parts, each of the pressure mechanisms protruding from the upper platen towards the pedestal electrode parts, the pressure mechanisms being arranged at a lower end of the pressure mechanisms and connectable to the other electrode of the power supply device. a pressure electrode portion and a plurality of pressure mechanisms each having a bearing mechanism for projecting the pressure electrode portion downward; and a plurality of cylinder mechanisms arranged corresponding to the plurality of pressure mechanisms, each connecting a cylinder to the corresponding pressure mechanism in a predetermined order, wherein the bearing mechanism projects the pressure electrode portion of the pressure mechanism to which the cylinder is connected downward further than the other pressure electrode portions, and the press-fitting and joining device presses the first member and the second member together such that the pressure electrode portion of the pressure mechanism to which the cylinder is connected is positioned forward. When the base electrode portion is connected to the other electrode of the power supply device and at least a position of the base electrode portion corresponding to the pressure electrode is connected to one electrode of the power supply device, the pressure electrode portion presses the second member with a predetermined pressure to press-fit and join the first member and the second member, and when the height position of the upper platen is returned to the origin by the lifting device, the connection between the pressure mechanism protruding downward and the power supply device is cut off and the connection between the cylinder and the pressure mechanism is released to return the height position of the protruding pressure electrode portion to the origin.

[0012] The press-fit joining method of the present invention is a press-fit joining method for press-fitting the holes of a "first member having a plurality of holes" with the shaft portion of a "second member having a shaft portion with a predetermined press-fit allowance between the holes of the first member" by passing an electric current between the first member and the second member while pressing the shaft portion with a predetermined pressure against each of the holes of the "first member having a plurality of holes," the press-fit joining method including a first member placing step of placing the first member on an upper surface of a plurality of base electrode portions having shaft portion accommodating holes such that the hole portions and the shaft portion accommodating holes overlap, a second member placing step of placing the second member such that a portion of the shaft portion is accommodated in each of the shaft portion accommodating holes and the second member is supported by edges of the holes of the first member, and a second member placing step of placing the second member at a position facing the plurality of base electrode portions. the cylinder connecting step of connecting a cylinder to one of the plurality of pressurizing mechanisms and causing a pressurizing electrode portion provided at a lower end of the pressurizing mechanism to protrude downward; a pressurizing mechanism with the pressurizing electrode portion protruding downward, while connected to one electrode of a power supply device, is lowered toward the base electrode portion connected to the other electrode of the power supply device, and a current is passed between the second member and the first member, thereby pressurizing the second member, thereby pressurizing the first member and the second member; and an origin return step of returning the pressurizing mechanism to an origin, releasing the connection between the pressurizing mechanism and the cylinder, and severing the connection between the pressurizing mechanism and the power supply device, wherein the steps from the cylinder connecting step to the origin return step are performed for each of the plurality of pressurizing mechanisms. Effect of the Invention

[0013] According to the press-fit joining device and press-fit joining method of the present invention, a plurality of pedestal electrodes on whose upper surfaces a first member can be placed and a plurality of pressure mechanisms arranged at positions facing the plurality of pedestal electrodes are provided, and the bearing mechanism protrudes the pressure electrode portion downward when the cylinder is connected, and in a state in which the pressure electrode portion of the pressure mechanism to which the cylinder is connected is connected to the other electrode of the power supply device and at least the pedestal electrode portion at a position corresponding to the pressure electrode portion is connected to one electrode of the power supply device, the pressure electrode portion presses the second member with a predetermined pressure to press-fit the hole portion of the first member and the shaft portion of the second member, so that it is not necessary to move the first member until the first member is placed on the pedestal electrode and all of the plurality of second members are press-fit joined, and there is no need to position the first member each time or transport the first member. Therefore, the work is not complicated and productivity can be increased.

[0014] According to the press-fit welding apparatus and press-fit welding method of the present invention, when the first and second members are press-fitted together, the pressurizing electrode of the pressurizing mechanism connected to the cylinder is connected to the other electrode of the power supply device, and at least the base electrode at a position corresponding to the pressurizing electrode is connected to one electrode of the power supply device, and the pressurizing electrode presses the second member with a predetermined pressure to press-fit the first and second members together, and when the height position of the upper platen is returned to the original position by the lifting device, the connection between the pressurizing mechanism protruding downward and the power supply device is cut, and the connection between the cylinder and the pressurizing mechanism is released to return the height position of the protruding pressurizing electrode to the original position, so that multiple joints can be performed one by one in order rather than in parallel. Therefore, when joining individual metal members, the current supplied from the power supply device can be concentrated on one pressurizing mechanism, and the voltage applied to one press-fitting joint is constant, which increases the joint reliability.

[0015] Furthermore, according to the press-fit joining device and press-fit joining method of the present invention, since the hole of the first member and the shaft of the second member are press-fit joined, almost no step occurs between the surface of the first member pressed by the pressurizing mechanism and the surface of the second member. Therefore, for example, when another member is used in contact with both the surface of the first member and the surface of the second member, the another member can be reliably brought into contact with both the surface of the first member and the surface of the second member, making it possible to prevent defects caused by the presence of a step. [Brief description of the drawings]

[0016] [Figure 1] 1A and 1B are views for explaining a bonded body 10, a first member 11A, and a second member 12A in the first embodiment. [Diagram 2] FIG. 1 is a diagram for explaining a pressure welding apparatus 100 according to a first embodiment. [Diagram 3] FIG. 1 is a block diagram for explaining a pressure welding apparatus 100 according to a first embodiment. [Figure 4] FIG. 11 is a view shown for explaining a first member placing step. [Diagram 5] FIG. 11 is a view shown for explaining a second member placing step. [Figure 6] FIG. 11 is a diagram for explaining the cylinder connecting process. [Figure 7] FIG. 13 is a diagram for explaining an upper platen lowering step. [Figure 8] FIG. 13 is a diagram for explaining a press-fit joining process. [Figure 9] FIG. 11 is a diagram for explaining an origin return process. [Figure 10] FIG. 11 is a diagram for explaining a cylinder switching process. [Figure 11] FIG. 11 is a view for explaining a bonded body transport step. [Figure 12] 10 is a diagram for explaining a bonded body 20, a first member 21A, and a second member 22A in the second embodiment. FIG. [Figure 13] FIG. 11 is a side view shown for explaining a pressure welding apparatus 101 according to a second embodiment. [Figure 14] FIG. 11 is a view shown for explaining a first member placing step. [Figure 15] FIG. 11 is a view shown for explaining a second member placing step. [Figure 16] FIG. 13 is a diagram for explaining a press-fit joining process. [Figure 17] FIG. 11 is a diagram for explaining a cylinder switching process. [Figure 18] FIG. 13 is a diagram showing a state where press-fit welding is performed in all the pressurizing mechanisms and the pressurizing mechanisms return to their original positions. [Figure 19] FIG. 11 is a view for explaining a bonded body transport step. [Figure 20] FIG. 2 is a diagram for explaining the press-in joining device of Patent Document 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] The press-fit welding apparatus and press-fit welding method of the present invention will be described below based on the embodiments shown in the drawings. Note that the embodiments described below do not limit the invention according to the claims. Also, not all of the elements and combinations thereof described in the embodiments are necessarily essential to the solution of the present invention.

[0018] [Embodiment 1] 1. Configuration of the Joint 10 First, a description will be given of a bonded body 10 manufactured by the pressure-insertion bonding apparatus according to embodiment 1. Fig. 1 is a diagram shown for explaining the bonded body 10. Fig. 1(a) is a plan view of the bonded body 10, Fig. 1(b) is a side view of the bonded body 10, Fig. 1(c) is a plan view showing a first member 11A, and Fig. 1(d) is a side view showing a second member 12A.

[0019] The joint body 10 is a metal member having a flat plate portion 11 and four shaft portions 12 that are disposed at positions corresponding to the corners of the flat plate portion 11 and extend in a direction perpendicular to the flat plate portion 11. The joint body 10 is joined by press-fitting flanges 15 of a second member 12A (see FIG. 1(d)), which is a shaft portion, into each of the hole portions 16 of a "first member 11A (see FIG. 1(c)) having a plurality of (four in the first embodiment) holes 16" (see FIGS. 1(a) and 1(b)).

[0020] 1(c), the first member 11A is a metal flat plate having a substantially rectangular shape in a plan view, and has a plurality of (four in the first embodiment) holes 16. The holes 16 are provided at positions corresponding to the four corners, and are arranged on substantially concentric circles from the center of the first member 11A.

[0021] The second member 12A is the shaft portion itself. As shown in FIG. 1(d), the second member 12A (shaft portion) has a shaft portion 13, a base portion 14, and a flange 15 which is a large diameter portion. The shaft portion 13 is threaded. The base portion 14 is disposed between the shaft portion 13 and the flange 15, and has an outer diameter larger than that of the shaft portion 13 and smaller than that of the flange 15. The flange 15 is a disk-shaped portion with a predetermined press-fit margin between the flange 15 and the hole portion 16 of the first member 11A. The thickness of the flange 15 is approximately the same as that of the first member 11A, and after press-fit joining, the flange 15 and the first member 11A are approximately flush with each other. The planar shape of the flange 15 does not have to be disk-shaped.

[0022] 2. Configuration of the press-fit welding apparatus 100 according to the first embodiment Next, a press-fit welding device according to an embodiment will be described. The press-fit welding device 100 according to an embodiment presses "a second member 12A having a shaft portion with a predetermined press-fit allowance between it and the hole 16 of the first member 11A having a plurality of holes 16" with a predetermined pressure against each of the holes 16 of the "first member 11A having a plurality of holes 16" while passing a current between the first member 11A and the second member 12A, thereby press-fitting and welding the hole 16 of the first member 11A and the second member 12A.

[0023] Specifically, a flange 15 of the second member 12A is placed in each of the hole portions 16 of the first member 11A, and an electric current is passed between the first member 11A and the second member 12A while pressing the second member 12A with a predetermined pressure, thereby generating electric resistance heat at the joint between the first member 11A and the second member 12A, and a predetermined portion (flange 15) of the second member 12A (shaft portion) is pressed into the hole portion 16 of the first member 11A, thereby solid-state diffusion bonding the hole portion 16 of the first member 11A and the second member 12A (shaft portion).

[0024] Fig. 2 is a side view shown for explaining the pressure-fitting and bonding apparatus 100 according to embodiment 1. Fig. 3 is a block diagram shown for explaining the pressure-fitting and bonding apparatus 100 according to embodiment 1. As shown in Figs. 2 and 3, the pressure-fitting and bonding apparatus 100 according to embodiment 1 includes a power supply unit 110 (see Fig. 3), a lower platen 120, an upper platen 130, a lifting device 140, a pedestal electrode unit 150, four pressure mechanisms 160, four cylinder mechanisms 170, a control unit 180 (see Fig. 3), and a transport unit 190.

[0025] An appropriate power source can be used for the power supply device 110. One electrode of the power supply device 110 is connected to each pressure electrode unit 162, and the other electrode is connected to the base electrode unit 150. Since the power supply device 110 connects to either the base electrode unit 150 or the pressure electrode unit 162 without voltage division, the current supplied from the power supply device to either the base electrode unit 150 or the pressure electrode unit 162 can be made constant.

[0026] The lower platen 120 is fixed to a base 122 and is connected to one electrode of the power supply unit 110 .

[0027] The upper platen 130 is disposed at a position opposite to the lower platen 120 , and is configured to be movable up and down toward the lower platen 120 by the lifting device 140 .

[0028] The lifting device 140 raises and lowers the upper platen 130. When press-fitting and joining the second member 12A and the first member 11A, the lifting device 140 lowers the upper platen 130, and presses the second member 12A from above by the pressure electrode portion 162 provided below the upper platen 130. After performing the press-fitting and joining, the upper platen 130 is raised and returned to the origin. The lifting device 140 can use an appropriate lifting mechanism. Instead of raising and lowering the upper platen 130, the lower platen 120 may be raised and lowered.

[0029] The pedestal electrode portions 150 are disposed at positions corresponding to the corner portions of the rectangle when viewed in plan at substantially the center on the lower platen 120, and are four columnar electrode portions on which the first member 11A can be placed on the upper surface (see FIG. 2). Each of the pedestal electrode portions 150 can be connected to one electrode of the power supply device 110, and at a position overlapping the hole portion 16 when the first member 11A is placed thereon, there is a shaft body accommodation hole 151 for accommodating the shaft portion 13, and it is formed above the shaft body accommodation hole 151, having an opening width larger than that of the shaft body accommodation hole 151 and a base accommodation portion 152 having a depth corresponding to the thickness of the base portion 14.

[0030] The four pressurizing mechanisms 160 are respectively disposed at positions facing the four pedestal electrode portions 150 on the lower surface of the upper platen 130, and are disposed in a state of protruding toward each of the four pedestal electrode portions 150. The four pressurizing mechanisms 160 each have a pressure electrode portion 162 disposed at the lower end of each pressurizing mechanism 160 and connectable to one electrode of the power supply device 110, and a bearing mechanism 164 that protrudes the pressure electrode portion 162 downward when connected to the cylinder 172. The lower end surface of the pressure electrode portion 162 is slightly larger than the flange 15.

[0031] The four cylinder mechanisms 170 are respectively disposed on the lower surface of the upper platen 130 corresponding to each of the four pressurizing mechanisms 160. The four cylinder mechanisms 170 have cylinders 172 connected to the pressurizing mechanisms 160 in a predetermined order.

[0032] The control unit 180 is connected to the lifting device 140 and the cylinder mechanism 170 (see FIG. 3). The control unit 180 performs the following controls: to send a signal to the four cylinder mechanisms 170 to extend the cylinders 172 in a predetermined order; to lower the upper platen 130 after the pressure electrode unit 162 protrudes downward; to temporarily stop the operation when the pressure electrode unit 162 comes into contact with the second member 12A, to allow a current to flow between the second member 12A and the first member 11A to generate electric resistance heat, and to further lower the upper platen 130 to perform press-fit bonding; to return the height position of the upper platen 130 to the original position by the lifting device 140 after performing press-fit bonding; and to cut the connection between the cylinders 172 and the pressure mechanism 160.

[0033] The conveying unit 190 is a jig that lifts the bonded body 10, in which the first member 11A and the second member 12A are press-joined, from the pedestal electrode unit 150 when the press-joining is completed for all four pressure mechanisms 160, removes the bonded body 10 from the pedestal electrode unit 150, and conveys it to a predetermined position. The conveying unit 190 is disposed on a conveying jig support unit 191 that can be raised and lowered vertically, and is raised and lowered vertically by the conveying jig support unit 191. Then, the bonded body 10 is placed on the conveying unit 190 and lifted from the pedestal electrode unit 150, and the bonded body 10 is gripped by another jig (e.g., a clamper, not shown) and conveyed to a predetermined position. After the bonded body 10 is gripped by the jig, the conveying unit 190 descends to a height position lower than the top of the pedestal electrode unit 150. The conveying unit 190 has a U-shape when viewed from above, and is provided so that the pedestal electrode unit 150 is disposed inside the U-shape. Then, the bonded body 10 is grasped with a jig from the open space of the U-shape (the right side in FIG. 11(b)) and transported to the outside.

[0034] 3. Press-fit joining method according to embodiment 1 FIG. 4 is a diagram for explaining the first member placing step. FIG. 5 is a diagram for explaining the second member placing step. FIG. 5(a) is a diagram showing the overall state of the press-fit welding apparatus 100 in the second member placing step, and FIG. 5(b) is an enlarged view of the main part showing the vicinity of the shaft body portion receiving hole 151. FIG. 6 is a diagram for explaining the cylinder connecting step. FIG. 7 is a diagram for explaining the upper platen lowering step. FIG. 8 is a diagram for explaining the press-fit welding step. FIG. 8(a) is a diagram showing the overall state of the press-fit welding apparatus 100 in the second member placing step, and FIG. 8(b) is an enlarged view of the main part showing the vicinity of the shaft body portion receiving hole 151. FIG. 9 is a diagram for explaining the origin return step. FIG. 10 is a diagram for explaining the cylinder switching step. FIG. 11 is a diagram for explaining the bonded body transport step. FIG. 11(a) is a diagram showing the overall state of the pressure-insertion bonding apparatus 100 in a bonded body transport step, and FIG. 11(b) is a plan view showing the bonded body 10 placed on a transport section 190. As shown in FIG.

[0035] The press-fit joining method according to the first embodiment is a method of press-fit joining the holes 16 of the first member 11A and the second member 12A (shaft portion) by applying a current between the first member 11A and the second member 12A while pressing the shaft portion of "the second member 12A which is a shaft portion with a predetermined press-fit allowance between it and the holes 16 of the first member 11A having a plurality of holes 16" with a predetermined pressure against each of the holes 16 of the "first member 11A having a plurality of holes 16." The press-fit joining method according to the first embodiment uses the press-fit joining apparatus according to the first embodiment, but other apparatus may also be used.

[0036] The press-fit bonding method according to the first embodiment includes a first member placing step, a second member placing step, a cylinder connecting step, an upper platen lowering step, a press-fit bonding step, a return to origin step, and a cylinder switching step, and performs the steps from the cylinder connecting step to the cylinder switching step for each of the four pressurizing mechanisms. After performing the steps from the cylinder connecting step to the cylinder switching step for all of the pressurizing mechanisms, a bonded body transport step is performed.

[0037] (1) First member placement process 4, the first member 11A is placed on the top surfaces of four pedestal electrode parts 150 having shaft body part accommodating holes 151 such that holes 16 overlap shaft body part accommodating holes 151 in a plan view. Specifically, the first member 11A is placed such that the edges of holes 16 of the first member 11A are positioned outside the base accommodating parts 152 and shaft body part accommodating holes 151 provided on the top surfaces of the pedestal electrode parts 150.

[0038] (2) Second member placement process Next, as shown in FIG. 5, the second member 12A is placed so that a part (shaft portion 13) of the second member 12A, which is the shaft portion, is accommodated in each of the shaft portion accommodating holes 151 and the second member 12A is supported by the edge of the hole portion 16 of the first member 11A. Specifically, the shaft portion 13, which is the shaft portion, is accommodated in each of the shaft portion accommodating holes 151, the base portion 14 of the second member 12A is accommodated in the base portion accommodating portion 152, and the second member 12A is placed in a state in which the flange 15 is supported by the edge of the hole portion 16 of the first member 11A. A predetermined press-fit allowance is provided between the flange 15 and the hole portion 16, and the flange 15 can be supported by the edge of the hole portion 16 of the first member 11A. Therefore, the base portion 14 of the second member 12A is in a state of being floated from the bottom of the base portion accommodating portion 152 (see FIG. 5(b)).

[0039] (3) Cylinder connection process Next, as shown in Fig. 6, a cylinder 172 is connected to one of the multiple (four) pressure mechanisms 160 (the pressure mechanism on the left side in Fig. 6) that are disposed at positions facing the multiple pedestal electrode parts 150, and the pressure electrode part 162 provided at the lower end of the pressure mechanism 160 is protruded downward. Specifically, first, the control unit 180 sends a signal (see Fig. 3) to the cylinder mechanism 170 that corresponds to one of the four pressure mechanisms 160 (the pressure mechanism on the left side in Fig. 6), and the cylinder 172 is connected to the corresponding pressure mechanism 160. The bearing mechanism 164 of the pressure mechanism 160 to which the cylinder 172 is connected protrudes the pressure electrode part 162 of the pressure mechanism 160 downward.

[0040] (4) Press-fit bonding process 1 (upper platen lowering process) 7, a signal is sent from the control unit 180 to the lifting device 140 (see FIG. 3), and with the pressure mechanism 160, with the pressure electrode portion 162 protruding downward, connected to one electrode of the power supply unit 110, the upper platen 130 is lowered until the protruding pressure electrode portion 162 contacts the corresponding second member 12A on the pedestal electrode portion 150. At this time, the other electrode of the power supply unit 110 and the pedestal electrode portion 150 are connected.

[0041] (5) Press-fit joining process 2 Next, the positional relationship between the second member 12A and the pressure electrode portion 162 is confirmed, and as shown in FIG. 8, the second member 12A is pressurized while passing a current between the second member 12A and the base electrode portion 150. This generates electric resistance heat at the joint between the first member 11A and the second member 12A, pressurizes the flange 15 of the second member 12A into the hole of the first member 11A, and solid-phase diffusion bonding is performed between the hole 16 of the first member 11A and the flange 15 of the second member 12A. Therefore, the first member 11A and the second member 12A can be press-fitted and bonded. At this time, the base 14 of the second member 12A is accommodated in the base accommodation portion 152 (see FIG. 8(b)), and the surface of the flange 15 and the surface of the first member 11A become approximately flush with each other.

[0042] (6) Origin return process 9, the pressurizing mechanism 160 is raised by the lifting device 140 and returned to the origin. In addition, the connection between the pressurizing mechanism 160 and the cylinder 172 is released, the extended cylinder 172 is returned to the origin, and the connection between the pressurizing mechanism 160 and the power supply device 110 is cut off.

[0043] (7) Cylinder switching process 10, a cylinder 172 of a cylinder mechanism 170 corresponding to a pressure mechanism 160 other than the pressure mechanism 160 that performed the press-fitting is connected to the pressure mechanism 160, and a pressure electrode portion 162 provided at the lower end of the pressure mechanism 160 is caused to protrude downward. At this time, it is preferable to perform the cylinder connecting step through the origin return step with a pressure mechanism that is diagonally opposite the pressure mechanism that previously performed the press-fitting, among the four pressure mechanisms 160 (for convenience of explanation, in FIG. 10, the right cylinder 172 is connected to the pressure mechanism 160).

[0044] Thereafter, the steps from the cylinder connecting step to the origin return step are performed for each of the four pressure mechanisms 160. At this time, all of the second members 12A are press-fitted and joined to the first members 11A to form the joined body 10.

[0045] (8) Bonded body transport process After all of the pressure mechanisms 160 have performed the processes from the cylinder connecting step to the origin return step, the transport jig support part 191 is raised to remove the bonded body 10 from the base electrode part 150 and lift it up to a predetermined height, as shown in Fig. 11. Then, the bonded body 10 is gripped by another jig (e.g., a clamper, not shown) and transported to a predetermined position.

[0046] In this manner, the first member 11A and the second member 12A are press-fitted and joined together, and the joined body 10 can be manufactured.

[0047] 4. Effects of the press-fit welding apparatus 100 and press-fit welding method according to the first embodiment According to the press-fit joining apparatus 100 and press-fit joining method of the first embodiment, there are provided four pedestal electrode portions 150 on whose upper surfaces the first member 11A can be placed, and four pressure mechanisms 160 arranged at positions facing the four pedestal electrode portions 150, respectively, and the bearing mechanism 164 projects the pressure electrode portion 162 downward when the cylinder 172 is connected, and the pressure electrode portion 162 of the pressure mechanism 160 to which the cylinder 172 is connected is connected to the other electrode of the power supply device 110, and at least With the base electrode part 150 at a position corresponding to the pressure electrode part 162 connected to one electrode of the power supply device 110, the pressure electrode part 162 presses the second member 12A with a predetermined pressure to press-fit and join the hole part 16 of the first member 11A and the second member 12A (shaft part), so there is no need to move the first member 11A until the first member 11A is placed on the base electrode part 150 and all of the multiple second members 12A are press-fit and joined, and there is no need to position the first member 11A each time or transport the first member 11A. This makes the work less cumbersome and increases productivity.

[0048] According to the press-fit joining apparatus 100 and press-fit joining method of embodiment 1, when the first member 11A and the second member 12A are press-fit joined together, the pressurizing electrode portion 162 of the pressurizing mechanism 160 to which the cylinder 172 is connected is connected to the other electrode of the power supply unit 110, and in a state in which at least a portion of the pedestal electrode portion 150 at a position corresponding to the pressurizing electrode portion 162 is connected to one electrode of the power supply unit 110, the pressurizing electrode portion 162 presses the second member 12A with a predetermined pressure to press-fit and join the first member 11A and the second member 12A together, and when the height position of the upper platen 130 is returned to the origin by the lifting device 140, the connection between the downwardly protruding pressurizing mechanism 160 and the power supply unit 110 is cut off, and the connection between the cylinder 172 and the pressurizing mechanism 160 is released to return the height position of the protruding pressurizing electrode portion 162 to the origin. Therefore, multiple joining operations can be performed one by one in order rather than in parallel. Therefore, when joining each second member 12A to the first member 11A, the current supplied from the power supply unit 110 can be concentrated to one pressure mechanism 160, and the voltage applied to one press-joining is constant, thereby increasing the joining reliability.

[0049] Furthermore, according to the press-fit joining device 100 and press-fit joining method of the first embodiment, the hole 16 of the first member 11A and the second member 12A (shaft portion) are press-fit joined, so that there is almost no step between the surface of the first member pressed by the pressurizing mechanism and the surface of the second member. Therefore, for example, when another member is used in contact with both the surface of the first member 11A and the surface of the second member 12A, the other member can be reliably brought into contact with both the surface of the first member 11A and the surface of the second member 12A, and defects caused by the presence of a step can be prevented.

[0050] According to the press-fit welding apparatus 100 of the first embodiment, the second member 12A (shaft portion) has the shaft portion 13 and the flange 15 having a larger outer diameter than the shaft portion 13, and the shaft portion accommodation hole 151 is configured to accommodate the shaft portion 13. The press-fit welding apparatus 100 press-fits and joins the hole portion 16 of the first member 11A and the flange 15 of the second member 12A, so that the number of joints is increased and the joint area is increased compared to the case where the shaft portion 13 and the hole portion 16 are simply press-fitted and joined. Therefore, the first member 11A and the second member 12A can be joined with high joint strength. In addition, when press-fitting and joining, the contact surface between the second member 12A and the pressure electrode portion 162 is increased, so that the pressure applied to the second member 12A can be applied evenly and horizontally to the first member 11A, and the flange 15 and the surface of the first member 11A can be easily made flush with each other.

[0051] Moreover, according to the press-fit joining device 100 of the first embodiment, the base 14 is between the shaft 13 and the flange 15 and has an outer diameter larger than that of the shaft 13 and smaller than that of the flange 15, and the pedestal electrode 150 has a base accommodating portion 152 at the top of the shaft body accommodating hole 151, the base accommodating portion 152 having an opening width larger than that of the shaft body accommodating hole 151 and a depth corresponding to the thickness of the base 14, so that when the second member 12A is placed on the first member 11A or when the first member 11A is press-fit joined, the first member 11A and the second member 12A can be positioned with high positioning accuracy.

[0052] Furthermore, since the base 14 and the bottom of the base housing portion 152 can position the second member 12A in the height direction, the second member 12A can be prevented from being pushed in, and the first member 11A and the flange can be more reliably made flush with each other. Therefore, the first member 11A and the second member 12A can be press-fitted and joined together while being positioned with high accuracy in the height direction as well.

[0053] Furthermore, if the base accommodating portion 152 were not present, it would be necessary to perform lateral positioning using the shaft portion accommodating hole 151, but it would be difficult to accurately position the elongated shaft portion, and there would be a risk of malfunction such as the shaft portion 13 rubbing against the shaft portion accommodating hole 151 when pressure is applied or when lifted by the conveying portion. However, the press-fit joining device 100 of embodiment 1 can prevent such malfunctions.

[0054] Moreover, the press-fit joining apparatus 100 according to the first embodiment includes the transport unit 190 that lifts the joined body 10 in which the first member 11A and the second member 12A are press-fitted and removed from the pedestal electrode unit 150 and transports it to the outside, so that the joined body 10 can be easily removed from the pedestal electrode unit 150 and transported to the outside. Moreover, since the joined body 10 is lifted along the direction in which the shaft portion 13 extends, it can be removed from the pedestal electrode unit 150 without the shaft portion 13 getting caught.

[0055] [Embodiment 2] Fig. 12 is a diagram for explaining the joined body 20, the first member 21A, and the second member 22A in embodiment 2. Fig. 12(a) is a plan view of the joined body 20, Fig. 12(b) is a side view of the joined body 20, Fig. 12(c) is a plan view showing the first member 21A, and Fig. 12(d) is a side view showing the second member 22A.

[0056] The press-fit bonding apparatus 101 according to the second embodiment basically has the same configuration as the press-fit bonding apparatus 100 according to the first embodiment. However, the configuration of the bonded body to be press-fit bonded, the configuration of the base electrode unit and the configuration of the transport unit are different from those of the press-fit bonding apparatus 100 and the press-fit bonding method according to the first embodiment.

[0057] In the second embodiment, the joint body 20 is a metal member having a substantially rectangular flat plate portion 21 and four shaft portions 22 arranged on the sides of the flat plate portion 21 and extending in a direction perpendicular to the flat plate portion 21 (see Figs. 12(a) and 12(b)). The joint body 20 is joined by press-fitting and joining flanges 24 of a second member 22A (see Fig. 12(d)), which is a shaft portion, to each of the hole portions 26 of a "first member 21A (see Fig. 12(c)) having a plurality (four in the second embodiment) of hole portions 26."

[0058] 12(c), the first member 21A is a metal flat plate having a substantially rectangular shape in a plan view, and has a plurality of holes 26 (four in the first embodiment) on each side. The holes 26 are provided at positions corresponding to the four sides, and are arranged substantially concentrically from the center of the first member 21A. Also, a central hole 27 is formed in the center of the first member 21A.

[0059] The second member 22A is a shaft portion having a through hole 25 formed in the center. As shown in FIG. 12(d), the second member 12A (shaft portion) has a cylindrical portion 23 that is a hollow shaft, and a flange 24 having an outer diameter larger than that of the cylindrical portion 23. The second member 22A has a through hole 25 that penetrates the cylindrical portion 23 and the flange 24, and the cylindrical portion 23 is not threaded. The flange 24 is a disk-shaped portion with a predetermined press-fit margin between it and the hole portion 26 of the first member 21A. The thickness of the flange 24 is approximately the same as that of the first member 21A, and after press-fit joining, the flange 24 and the first member 21A are approximately flush with each other. The planar shape of the flange 24 does not have to be disk-shaped.

[0060] The press-fit welding apparatus 101 according to the second embodiment basically has the same configuration as the press-fit welding apparatus 100 according to the first embodiment, but the configuration of the base electrode portion is different from that of the press-fit welding apparatus 100 according to the first embodiment (see FIG. 13).

[0061] In embodiment 2, the base electrode portion 150 has an axis portion accommodating hole 151 provided on the upper part of the base electrode portion 150 and configured to accommodate the tubular portion 23, and a support portion 154 formed on the edge of the axis portion accommodating hole 151 and supporting the flange 24 of the second member 22A, and the bottom of the axis portion accommodating hole 151 has a bottomed tubular receiving portion 155 provided with a protrusion 153 of a size corresponding to the inner diameter of the hollow shaft of the tubular portion 23.

[0062] The receiving portion 155 is disposed on a connecting portion 193 provided on a lift plate 192 extending outside the pedestal electrode portion 150. The lift plate 192 is disposed on a lift plate support portion 194, and by moving the lift plate support portion 194 up and down, the lift plate 192, and therefore the receiving portion 155, can be moved up and down. In the receiving portion 155, the height position of the tip of the support portion 154 is at a higher height position than the other portions of the pedestal electrode portion 150 before press-fit bonding, and is at the same height position as the other portions of the pedestal electrode portion 150 after press-fit bonding. The receiving portion 155 is formed of ceramic.

[0063] The transport section is provided with a discharge chuck 195 (see FIG. 19) instead of a clamper as in the first embodiment. The discharge chuck 195 moves two claws to hook the central hole 27 of the bonded body 20, lift it up, and transport it to the outside. As the discharge chuck, a suction chuck, an electromagnetic chuck, or any other appropriate jig can be used for holding the bonded body 20.

[0064] The press-fit bonding method according to the second embodiment basically has the same configuration as the press-fit bonding method according to the first embodiment. However, the operation of the base electrode portion in the press-fit bonding step and the bonded body transport step are different from those of the press-fit bonding method according to the first embodiment.

[0065] FIG. 14 is a diagram for explaining the first member placing step. FIG. 14(a) is a diagram showing the overall state of the press-fit welding apparatus 101 in the first member placing step, and FIG. 14(b) is an enlarged view of the main part showing the vicinity of the shaft portion accommodating hole 151 (same in FIGS. 15 to 17). FIG. 15 is a diagram for explaining the second member placing step. FIG. 16 is a diagram for explaining the press-fit welding step. FIG. 17 is a diagram for explaining the cylinder switching step. FIG. 18 is a diagram showing the state when press-fit welding is performed in all the pressure mechanisms and the original point is returned. FIG. 19 is a diagram for explaining the joined body transport step.

[0066] (1) First member placement process 14, first member 21A is placed on the top surfaces of four pedestal electrode parts 150 having shaft body part accommodating holes 151 so that hole part 26 and shaft body part accommodating hole 151 overlap in a plan view. Specifically, first member 21A is placed on support part 154 of receiving part 155 provided on the top surface of pedestal electrode part 150 for all pedestal electrode parts 150 so as to match hole part 26. The tip of support part 154 protrudes from the top surface of pedestal electrode part 150, and when first member 21A is placed, the top surface of support part 154 and the surface of first member 21A become approximately flush with each other.

[0067] (2) Second member placement process 15, a part (cylindrical portion 23) of second member 22A, which is the shaft portion, is accommodated in each shaft portion accommodating hole 151, and second member 22A is placed so that second member 22A is supported by the edge of hole 26 of first member 21A and support portion 154 of receiving portion 155. Cylindrical portion 23 of second member 22A is accommodated in shaft portion accommodating hole 151 of receiving portion 155, and through hole 25 of cylindrical portion 23 is positioned by protrusion 153 provided on the bottom of shaft portion accommodating hole 151.

[0068] (3) Cylinder connection process and press-fit joining process 1 (upper platen lowering process) Next, as in the first embodiment, a cylinder 172 is connected to one of the multiple (four) pressure mechanisms 160, causing the pressure electrode portion 162 provided at the lower end of the pressure mechanism 160 to protrude downward. Next, a signal is sent from the control unit 180 to the lifting device 140, and the pressure mechanism 160 with the pressure electrode portion 162 protruding downward is connected to one electrode of the power supply unit 110, and the upper platen 130 is lowered until the protruding pressure electrode portion 162 contacts the corresponding second member 22A on the base electrode portion 150. At this time, the other electrode of the power supply unit 110 and the base electrode portion 150 are connected.

[0069] (4) Press-fit joining process 2 Next, the positional relationship between the second member 22A and the pressure electrode portion 162 is confirmed, and as shown in Fig. 16, the second member 22A is pressurized while passing a current between the second member 22A and the base electrode portion 150. This generates electric resistance heat at the joint between the first member 21A and the second member 22A, presses the flange 24 of the second member 12A into the hole of the first member 21A, and solid-phase diffusion bonding is performed between the hole 26 of the first member 21A and the flange 24 of the second member 22A, thereby press-joining the first member 21A and the second member 22A. At this time, the receiving portion 155 is moved downward together with the second member 22A.

[0070] (5) Origin return process Next, the pressure mechanism 160 is raised by the lifting device 140 and returned to the original position. Also, the connection between the pressure mechanism 160 and the cylinder 172 is released, the extended cylinder 172 is returned to the original position, and the connection between the pressure mechanism 160 and the power supply device 110 is cut off.

[0071] (6) Cylinder switching process Next, as shown in FIG. 17, the cylinder 172 of the cylinder mechanism 170 corresponding to the pressing mechanism 160 different from the pressing mechanism 160 that has performed press-fitting joining is connected to the pressing mechanism 160, and the pressing electrode portion 162 provided at the lower end of the pressing mechanism 160 is made to project downward. At this time, among the four pressing mechanisms 160, it is preferable to perform the origin return process from the cylinder connection process with the pressing mechanism located at the diagonal position to the pressing mechanism that has previously performed press-fitting joining (in FIG. 17, for the sake of explanation, the right cylinder 172 and the pressing mechanism 160 are connected).

[0072] Thereafter, for all four pressing mechanisms 160, the processes from the cylinder connection process to the origin return process are each performed. At this time, all the second members 12A are press-fitted to the first member 11A, and the joined body 10 is formed.

[0073] (7) Joined body conveyance process After performing the processes from the cylinder connection process to the origin return process with all the pressing mechanisms 160 (see FIG. 18), the discharge chuck 195 is moved to the position of the central hole 27 of the joined body 20, the two claws are moved to hook the central hole 27 of the joined body 20 and lift it upward (see FIGS. 19(b) and 19(c)), and it is conveyed to the outside (see FIG. 19).

[0074] In this way, the first member 21A and the second member 22A can be press-fitted to manufacture the joined body 20.

[0075] In this way, the press-fit joining apparatus 101 and the press-fit joining method according to the second embodiment differ from the press-fit joining apparatus 100 and the press-fit joining method according to the first embodiment in the configuration of the bonded body to be press-fit joined and the configuration of the pedestal electrode unit and the transport unit. However, like the press-fit joining apparatus 100 and the press-fit joining method according to the first embodiment, the press-fit joining apparatus 101 and the press-fit joining method according to the second embodiment include four pedestal electrode units 150 on whose upper surfaces the first member 21A can be placed, and four pressure mechanisms 160 arranged at positions facing the four pedestal electrode units 150, respectively. The bearing mechanism 164 projects the pressure electrode unit 162 downward when the cylinder 172 is connected, and the cylinder 172 supports the pressure electrode unit 162. In a state where the pressure electrode part 162 of the connected pressure mechanism 160 is connected to the other electrode of the power supply device 110, and at least the base electrode part 150 at a position corresponding to the pressure electrode part 162 is connected to one electrode of the power supply device 110, the pressure electrode part 162 presses the second member 22A with a predetermined pressure to press-fit and join the hole part 26 of the first member 21A and the second member 22A (shaft part), so that it is not necessary to move the first member 21A until the first member 21A is placed on the base electrode part 150 and all of the second members 22A are press-fit and joined, and there is no need to position the first member 21A each time or transport the first member 21A. Therefore, the work is not complicated and productivity can be increased.

[0076] According to the press-fit joining apparatus 101 and press-fit joining method of the second embodiment, when the first member 21A and the second member 22A are press-fit joined together, the pressurizing electrode portion 162 of the pressurizing mechanism 160 to which the cylinder 172 is connected is connected to the other electrode of the power supply unit 110, and in a state in which at least the pedestal electrode portion 150 at a position corresponding to the pressurizing electrode portion 162 is connected to one electrode of the power supply unit 110, the pressurizing electrode portion 162 presses the second member 22A with a predetermined pressure to press-fit and join the first member 21A and the second member 22A together, and when the height position of the upper platen 130 is returned to the origin by the lifting device 140, the connection between the downwardly protruding pressurizing mechanism 160 and the power supply unit 110 is cut off, and the connection between the cylinder 172 and the pressurizing mechanism 160 is released to return the height position of the protruding pressurizing electrode portion 162 to the origin. Therefore, multiple joining operations can be performed one by one in order rather than in parallel. Therefore, when joining each second member 22A to the first member 21A, the current supplied from the power supply unit 110 can be concentrated to one pressure mechanism 160, and the voltage applied to one press-joining becomes constant, thereby increasing the joining reliability.

[0077] Furthermore, according to the press-fit joining apparatus 101 and press-fit joining method of embodiment 2, the second member 22A (shaft portion) has a tubular portion 23 which is a hollow shaft, and a flange 24 having an outer diameter larger than that of the tubular portion 23, and the shaft portion accommodating hole 151 is configured to accommodate the tubular portion 23. The press-fit joining apparatus 101 press-fits and joins the hole portion 26 of the first member 21A and the flange 24 of the second member 22A, so that it is possible to press-fit and join not only threaded shaft portions, but also shaft portions having a through hole 25 formed in the center, such as a collar.

[0078] Furthermore, according to the press-fit joining apparatus 101 of embodiment 2, the shaft body accommodating hole 151 has a depth corresponding to the length from the flange 24 of the tubular portion 23, and a protrusion 153 of a size corresponding to the inner diameter of the hollow shaft of the tubular portion 23 is provided at the bottom of the shaft body accommodating hole 151, so that a member having a hole formed in the center, such as the second member 22A, can be positioned with high precision.

[0079] Furthermore, according to the press-fit joining apparatus 101 of embodiment 2, the pedestal electrode portion 150 has an axis portion accommodating hole 167 that is provided on the upper part of the pedestal electrode portion 150 and is configured to accommodate the tubular portion 23, and a support portion 154 that is formed on the edge of the axis portion accommodating hole 151 and supports the flange 24 of the second member 22A, and a bottomed cylindrical receiving portion 155 is provided at the bottom of the axis portion accommodating hole 151 and is provided with a convex portion 153 of a size corresponding to the inner diameter of the hollow shaft of the tubular portion 23. In the receiving portion 155, the height position of the tip of the support portion 154 is higher than the other parts of the pedestal electrode portion 150 before press-fit joining and is at the same height position as the other parts of the pedestal electrode portion 150 after press-fit joining. Therefore, in the joint transport process, when the joint 20 is removed by the discharge chuck 195, it is possible to prevent the second member 22A from getting caught in the axis portion accommodating hole 151 and becoming difficult to remove.

[0080] The press-fit welding apparatus 101 and the press-fit welding method according to the second embodiment have the same configuration as the press-fit welding apparatus 100 and the press-fit welding method according to the first embodiment except for the configuration of the bonded bodies to be press-fitted and the configurations of the base electrode unit and the conveying unit, and therefore have the corresponding effects among the effects of the press-fit welding apparatus 100 and the press-fit welding method according to the first embodiment.

[0081] Although the present invention has been described based on the above embodiment, the present invention is not limited to the above embodiment. It can be embodied in various forms without departing from the spirit of the present invention, and for example, the following modifications are also possible.

[0082] (1) The positions, connections, quantities, etc. described in the above embodiments (including the modified examples; the same applies below) are merely examples and may be changed without impairing the effects of the present invention.

[0083] (2) In each of the above embodiments, the second member is configured by the shaft portion itself, but the present invention is not limited to this. The present invention is also applicable to cases where the second member has a configuration other than the shaft portion.

[0084] (3) In the above embodiments, four second members are press-fitted into the first member as the plurality of second members, but the present invention is not limited to this. Two, three, or five or more second members may be press-fitted into the first member as the plurality of second members. Accordingly, the number of pedestal electrodes, cylinders, pressure mechanisms, etc. may be provided in a number corresponding to the number of second members.

[0085] (4) In the above embodiments, a second member having a flange is used as the second member, but the present invention is not limited to this. A second member without a flange may also be used. In this case, even if the shaft portion is a hollow shaft, the second member can be positioned by providing a protrusion of a size corresponding to the inner diameter of the hollow shaft at the bottom of the shaft portion accommodating hole.

[0086] (5) In each of the above embodiments, a switch may be provided to manage the connection to the power supply device. [Explanation of symbols]

[0087] 10...joint body, 11, 21...flat plate portion, 11A, 21A...first member, 12, 22...shaft body portion, 12A, 22A...second member, 13...shaft portion, 14...base portion, 15, 24...flange, 16, 26...hole portion, 20...joint body, 23...cylindrical portion, 25...through hole, 27...central hole, 100, 101...press-fit joining device, 110...power supply device, 120...lower platen, 130...upper platen, 140...lifting device, 150... Pedestal electrode portion, 152, 197...shaft body portion accommodating hole, 154...base portion accommodating portion, 160...pressure mechanism, 162...pressure electrode portion, 164...bearing mechanism, 170...cylinder mechanism, 172...cylinder, 180...control portion, 190...transport portion, 192...transport jig support portion, 193...lift plate support portion, 194...lift plate, 195...connection portion, 196...receiving portion, 198...projection portion, 199...support portion, 200...ejection chuck

Claims

1. A press-fit joining device that press-fits and joins the holes of a first member and the shaft portion of a second member by applying a current between the first member and the second member while pressing a shaft portion of a second member having a shaft portion with a predetermined press-fit allowance between the second member and the hole portions of a first member having a plurality of holes with a predetermined pressure, A power supply device; A lower platen; an upper platen disposed opposite the lower platen; a lifting device for lifting and lowering the upper platen; a plurality of base electrode parts arranged on the lower platen, on whose upper surfaces the first member can be placed, each of the base electrode parts being connectable to one electrode of the power supply device, and each of the base electrode parts having a shaft body portion accommodating hole at a position overlapping with the hole portion when the first member is placed; a plurality of pressure mechanisms disposed on the underside of the upper platen at positions facing the plurality of base electrode portions, each of the pressure mechanisms protruding from the upper platen toward the base electrode portions, the pressure mechanisms each having a pressure electrode portion disposed at a lower end of the pressure mechanism and connectable to the other electrode of the power supply device, and a bearing mechanism for protruding the pressure electrode portion downward; a plurality of cylinder mechanisms that are arranged corresponding to the plurality of pressure mechanisms, and connect cylinders to the corresponding pressure mechanisms in a predetermined order; the bearing mechanism causes the pressure applying electrode portion of the pressure applying mechanism to which the cylinder is connected to protrude downward relative to the other pressure applying electrode portions; When the press-fit joining device presses the first member and the second member together, the press-fit joining device presses the second member with a predetermined pressure using the press-fit electrode unit of the press-fitting mechanism to which the cylinder is connected, in a state in which the press-fit electrode unit is connected to the other electrode of the power supply device and at least a portion of the pedestal electrode unit at a position corresponding to the press-fit electrode unit is connected to one electrode of the power supply device, thereby press-fitting and joining the first member and the second member together; When the lifting device returns the height position of the upper platen to the origin, the connection between the downwardly protruding pressure mechanism and the power supply is cut off, and the connection between the cylinder and the pressure mechanism is released, thereby returning the height position of the protruding pressure electrode portion to the origin.

2. The shaft portion has a shaft portion and a large diameter portion having an outer diameter larger than that of the shaft portion, The shaft portion accommodating hole is configured to accommodate the shaft portion, The press-fitting and welding apparatus according to claim 1 , wherein the press-fitting and welding apparatus press-fits and welds the hole portion of the first member and the large diameter portion of the second member.

3. a base portion between the shaft portion and the large diameter portion, the base portion having an outer diameter larger than that of the shaft portion and smaller than that of the large diameter portion; The press-fit welding device according to claim 2, characterized in that the pedestal electrode portion further has a base accommodating portion at an upper portion of the shaft portion accommodating hole, the base accommodating portion having an opening width larger than that of the shaft portion accommodating hole and a depth corresponding to a thickness of the base.

4. 4. The press-fit bonding apparatus according to claim 1, further comprising a transport unit that lifts up a bonded body formed by press-fitting the first member and the second member, removes the bonded body from the base electrode portion, and transports the bonded body to an outside.

5. The shaft portion has a cylindrical portion that is a hollow shaft and a large diameter portion that has an outer diameter larger than that of the cylindrical portion, The shaft portion accommodating hole is configured to accommodate the cylindrical portion, The press-fitting and welding apparatus according to claim 1 , wherein the press-fitting and welding apparatus press-fits and welds the hole portion of the first member and the large diameter portion of the second member.

6. the shaft portion accommodating hole has a depth corresponding to a length of the cylindrical portion from the large diameter portion, 6. The press-fit welding device according to claim 5, wherein a convex portion having a size corresponding to an inner diameter of the hollow shaft is provided on a bottom of the shaft portion accommodating hole.

7. The base electrode portion is a bottomed cylindrical receiving portion including the shaft body portion accommodating hole provided on an upper portion of the base electrode portion and configured to accommodate the tubular portion, and a support portion formed on an edge of the shaft body portion accommodating hole and supporting the large diameter portion of the second member, a protrusion having a size corresponding to an inner diameter of the hollow shaft of the cylindrical portion is provided at a bottom of the shaft portion accommodating hole, The pressure-insulating joining device according to claim 5 or 6, characterized in that a height position of a tip of the support portion is at a higher height position than other parts of the base electrode portion before pressure-insulating joining, and is at the same height position as other parts of the base electrode portion after pressure-insulating joining.

8. The shaft portion is a hollow shaft, 2. The press-fit welding device according to claim 1, wherein a convex portion having a size corresponding to an inner diameter of the hollow shaft is provided on a bottom of the shaft portion accommodating hole.

9. A press-fit joining method for press-fitting and joining the holes of a first member and the shaft portion of a second member by applying a current between the first member and the second member while pressing a shaft portion of a second member having a shaft portion with a predetermined press-fit allowance between the second member and the hole portions of a first member having a plurality of holes with a predetermined pressure, a first member placing step of placing the first member on an upper surface of a plurality of base electrode parts having shaft body portion accommodating holes such that the holes and the shaft body portion accommodating holes overlap; a second member placing step of placing the second member such that a portion of the shaft portion is accommodated in each of the shaft portion accommodating holes and the second member is supported by an edge of the hole portion of the first member; a cylinder connecting step of connecting a cylinder to one of a plurality of pressure mechanisms disposed at positions facing the plurality of base electrode portions, and causing a pressure electrode portion provided at a lower end of the pressure mechanism to protrude downward; a press-fit joining process in which a pressurizing mechanism having the pressurizing electrode portion protruding downward is lowered toward the base electrode portion connected to one electrode of a power supply device while being connected to the other electrode of the power supply device, and the first member and the second member are pressurized while a current is passed between the second member and the first member; a return to origin process of returning the pressure mechanism to an origin, releasing the connection between the pressure mechanism and the cylinder, and disconnecting the pressure mechanism from the power supply device, A press-fit welding method, comprising the steps of: performing the cylinder connecting step through the origin returning step for each of the plurality of pressurizing mechanisms.

10. the pressure mechanisms are disposed at positions symmetrical to one another with respect to a predetermined point in a plan view, The press-fit joining method according to claim 9, characterized in that when the cylinder connecting step to the origin return step are performed on one of the multiple pressurizing mechanisms, the cylinder connecting step to the origin return step are then performed on a pressurizing mechanism located in a position symmetrical to the one pressurizing mechanism or in a position closest to it.

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