JP2006026715A - Cold friction welding method and cold friction welding equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cold friction welding method and a cold friction welding equipment capable of correctly managing the welding strength of metal plates based on the pressure of a die. <P>SOLUTION: A load cell 65 (a load measurement means) is interposed between a die 50 and a hydraulic cylinder 60 (a driving means) to provide the driving force to the die 50 in the pressing direction. When the die 50 enters a terminal piece 10, the reaction force against the pressure from the die 50 is applied to the die 50 side from welding areas 11a, 21a side of the terminal piece 10 and a bus bar 20 in a welding area of the terminal piece 10 corresponding to the die 50, and the reaction force is measured by the load cell 65. The reaction force from the welding areas 11a, 21a indicates the welding strength in the welding areas 11a, 21a, and the welding strength is correctly manageable. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cold pressure welding method and a cold pressure welding apparatus.

Conventionally, as a method of manufacturing a metal joined body by superimposing and integrating a plurality of metal plate materials, as shown in FIGS. 5 and 6, a plurality of metal plate materials 100 and 101 that are overlapped with the plate surface. The metal bonded body 104 is manufactured by being pressed while being deformed so as to form the concave portion 103 on the surface side by pressing with the dice 102 in the intersecting direction. According to this cold welding method, when the die 102 presses the metal plate members 100, 101, the metal plate members 100, 101 are deformed so as to be recessed and are pressed by the die 102 out of the plate surfaces of the metal plate members 100, 101. The regions 100a and 101a to be bonded are in close contact with each other. A means for joining metals together by cold welding is disclosed in Patent Document 1.
Japanese Patent Laid-Open No. 2-280979

  The joining strength of the joined metal plate materials 100 and 101 is determined by the adhesion strength in the joining regions 100a and 101a. Factors that change the adhesion strength of the bonding regions 100a and 101a include the penetration speed of the die 102 into the metal plate materials 100 and 101, the amount of penetration, the pressure holding time during which the die 102 is most invaded, and the metal plate material 100. , 101, there is a pressing force of the die 102, among which the pressing force of the die 102 has a great influence.

As means for managing the pressing force of the dice 102, a lower jig 105 located on the opposite side of the dice 102 is placed on a weight scale, and the dice 102 with respect to the metal plates 100, 101 are measured based on the measured value of the weight scale. A method of adjusting and setting the amount of intrusion of the image can be considered. However, in the case of this method, if the metal plate materials 100 and 101 are rigid bodies that do not cause deformation, the measurement value of the weigh scale can be regarded as the pressing force of the die 102 as it is. In cold pressure welding in which the metal plate materials 100 and 101 are deformed, the measurement value of the weigh scale shows a value smaller than the pressing force actually applied from the die 102 to the joining regions 100a and 101a. Therefore, in the method of measuring by placing the jig 105 on the weighing scale, the bonding strength of the bonding regions 100a and 101a cannot be accurately managed.
The present invention has been completed based on the above circumstances, and an object thereof is to accurately manage the bonding strength of a metal plate material based on the pressing force of a die.

  As a means for achieving the above object, in the invention of claim 1, a concave portion is formed on the surface side by pressing a plurality of stacked metal plate materials with a die in a direction intersecting the plate surface. A cold pressure welding method in which a metal joined body is manufactured by joining while deforming in such a manner that a load measuring means is interposed between the die and a driving means for applying a driving force in the pressing direction to the die. And the amount of penetration of the die into the metal plate material is managed based on the measurement value of the load measuring means.

  Invention of Claim 2 uses the jig | tool provided with the control part which controls that the said metal plate material deform | transforms so that the projection shape seen in the die press direction may be expanded in the thing of Claim 1. The metal joined body is manufactured by pressing the plurality of metal plate members set on the jig with the die.

According to a third aspect of the present invention, in the one according to the first or second aspect, of the two metal plate materials having different hardnesses, the metal plate material having a higher hardness is arranged on the surface side pressed by the die. It has a feature.
According to a fourth aspect of the invention, there is provided the method according to any one of the first to third aspects, wherein the plurality of metal plate members are deformed so as to warp around the concave portion in a direction opposite to the pressing direction of the die. It is characterized in that it is joined by being pressed by the die in a state where it is set in a jig provided with a restricting portion for restricting.

  The invention according to claim 5 is a metal joined body in which a plurality of stacked metal plate members are pressed with a die in a direction intersecting with the plate surface while being deformed so that a concave portion is formed on the surface side. A cold pressure welding apparatus for manufacturing a load measuring means is interposed between the die and a driving means for applying a driving force in the pressing direction to the die, and a measured value of the load measuring means The feature is that the amount of penetration of the die into the metal plate material is managed based on the above.

  A sixth aspect of the present invention is the apparatus according to the fifth aspect, further comprising a jig having a restricting portion for restricting the metal plate material from being deformed so as to enlarge a projected shape viewed in the die pressing direction. However, it has characteristics.

  The invention according to claim 7 is the one according to claim 5 or 6, wherein the surface of the die facing the metal plate is a flat pressing surface substantially perpendicular to the pressing direction. The outer peripheral surface and the pressing surface are characterized by being connected via an arcuate surface.

The invention of claim 8 is characterized in that the surface of the die is mirror-finished in any one of claims 5 to 7.
According to a ninth aspect of the present invention, in the method according to any one of the fifth to eighth aspects, the plurality of metal plate members are deformed so as to warp around the concave portion in a direction opposite to the pressing direction of the die. It has a feature in that it is provided with a jig having a restricting portion for restricting.

<Invention of Claims 1 and 5>
In the joining region corresponding to the die of the metal plate material, a reaction force against the pressing force from the die acts from the joining region side to the die side, and this reaction force is measured by the load measuring means. Since the reaction force from the bonding region indicates the adhesion strength in the bonding region, that is, the bonding strength, the bonding strength can be accurately managed.

<Invention of Claims 2 and 6>
When the metal plate material is set in a jig and pressed with a die, the metal plate material is restricted from being deformed so as to enlarge the projected shape viewed in the die pressing direction, and therefore corresponds to the die of the metal plate material. Unstable deformation does not occur so that the joining region is expanded. Therefore, there is no possibility that the joining strength varies due to unstable spread deformation of the joining region, and the joining strength can be accurately managed based on the measurement value of the load measuring means.

<Invention of Claim 3>
When the metal plate material is deformed so as to be depressed by being pressed with a die, the region of the metal plate material that is pressed with the die is extended and deformed while being displaced from the center to the outer peripheral side. Here, when the die presses the metal plate material with low hardness directly, the metal plate material that easily deforms a large part of the extension amount due to the intrusion of the die takes over, and is excessive at the contact interface between the metal plate materials. As a result, there is a concern that variations in the bonding strength occur.
On the other hand, in the present invention, since the metal plate with higher hardness is pressed with a die, when the metal plate with higher hardness is deformed so as to be recessed, the metal plate with lower hardness follows accordingly. It will be deformed to be recessed. Therefore, the extension amount of the high-hardness metal plate and the extension amount of the low-hardness metal plate are almost the same, and excessive slippage does not occur at the contact surface of both metal plates. Thus, there is no possibility that the bonding strength varies, and the bonding strength can be accurately managed based on the measurement value of the load measuring means.

<Invention of Claims 4 and 9>
When the metal plate material is set in a jig and pressed with a die, the metal plate material does not deform so as to be warped in the opposite direction to the pressing direction of the die around the recess, so that the shape is stabilized.
<Invention of Claim 7>
The region pressed by the pressing surface of the die of the metal plate material is deformed so as to flow from the center of the pressing surface to the outer peripheral side and flow along the outer peripheral surface of the die. Since the outer peripheral surface is continuous through the arcuate surface, the metal plate material can be stably deformed so that the bonding strength can be accurately managed based on the measurement value of the load measuring means.

<Invention of Claim 8>
The region pressed by the pressing surface of the die in the metal plate material is deformed so as to flow along the surface of the die, but in the present invention, since the surface of the die is mirror-finished, the die and the metal plate material The frictional resistance between the two is reduced, the deformation of the metal plate material is stably performed, and as a result, the bonding strength based on the measurement value of the load measuring means can be managed accurately.

<Embodiment 1>
A first embodiment of the present invention will be described below with reference to FIGS. The metal joined body A of this embodiment joins the terminal metal fitting 10 (metal plate material which is a constituent element of the present invention) and the bus bar 20 (metal plate material which is a constituent element of the present invention) by cold welding. Manufactured. The terminal fitting 10 is obtained by bending a copper alloy plate material punched into a predetermined shape, and has a box portion 12 on the front end side, and a joining portion 11 having a substantially rectangular flat plate shape on the rear end side. Yes. One bus bar 20 is formed by bending a copper plate material punched into a predetermined shape, and has a joining portion 21 having a flat plate shape having the same width as the joining portion 11 of the terminal fitting 10.

  The hardness of the terminal fitting 10 is HV115, and the hardness of the bus bar 20 is HV85. That is, the terminal fitting 10 has higher hardness than the bus bar 20, and the terminal fitting 1010 is less likely to be deformed. The terminal fitting 10 and the bus bar 20 are joined so as to be electrically conductive in a state in which the joint portions 11 and 21 are vertically overlapped. Here, the joint portion 11 of the terminal metal fitting 10 having high hardness is overlapped on the upper surface (front surface) side of the joint portion 21 of the bus bar 20. This is because the die 50, which is a joining means, is joined from the top downward. This is an arrangement in consideration of pressing.

Next, the cold pressure welding apparatus will be described.
The upper jig 30 is made of alloy tool steel (SKD11), has a thick plate shape as a whole, and has a cavity 31 for accommodating the terminal fitting 10 on the lower surface. The joint 11 of the terminal fitting 10 is positioned and accommodated in the cavity 31 without any backlash (displacement) in the horizontal direction (direction substantially orthogonal to the pressing direction of the die 50). The inner surface of the cavity 31 functions as a restricting portion 32 for restricting the terminal fitting 10 from deforming so as to enlarge the projected shape seen in the die pressing direction, that is, the shape of the upper surface (surface) of the joint portion 11. To do. Further, the ceiling surface of the cavity 31 functions as a restricting portion 34 that restricts the terminal fitting 10 and the bus bar 20 from being deformed so as to warp around the recess B in the direction opposite to the pressing direction of the die 50.

  The upper jig 30 is formed with a guide hole 33 having a circular shape in the vertical direction (perpendicular to the plate surfaces of the joint portions 11 and 21) from the upper surface to the ceiling surface (inner surface) of the cavity 31. The inner peripheral surface of the guide hole 33 has a tapered shape that gradually decreases in diameter downward (in the same direction as the direction in which the die 50 presses against the terminal fitting 10 and the bus bar 20). Further, the upper jig 30 is fixed to the lower jig 40 by bolts (not shown) whose axis is directed in the vertical direction at the peripheral edge (four corners). , 40 can be elastically deformed so as to bend upward with the guide hole 33 far from the bolt tightening point as a substantial center. The ceiling surface of the cavity 31 of the upper jig 30 is mirror-finished as means for reducing the frictional resistance with the upper surface of the joint 11 of the terminal fitting 10.

  One lower jig 40 is made of alloy tool steel (SKD11) and has a thick plate shape as a whole. On the upper surface of the lower jig 40, a cavity 41 for accommodating the joint portion 21 of the bus bar 20 is formed. In a state where the joint portion 21 is accommodated in the cavity 41, the joint portion 21 is positioned without backlash (displacement) in the horizontal direction. A restriction for restricting deformation of the inner surface of the cavity 41 so as to enlarge the projected shape of the bus bar 20 viewed in the die pressing direction, that is, the projected shape viewed from the upper surface (front surface) side of the joint portion 21. It functions as the unit 42. In addition, the bottom surface of the cavity 41 functions as a restricting portion 43 that restricts the terminal fitting 10 and the bus bar 20 from being deformed so as to warp around the recess B in the direction opposite to the pressing direction of the die 50. Further, the inner surface of the cavity 41 of the lower jig 40 is mirror-finished as means for reducing the frictional resistance with the lower surface of the joint portion 21 of the bus bar 20.

  The die 50 is made of alloy tool steel (SKD11) and has a hardness of HV700 to 750. The die 50 has a cylindrical shape whose axis is directed in the vertical direction, and the outer peripheral surface 51 has a taper shape whose diameter decreases in the pressing direction with respect to the terminal fitting 10. The die 50 is inserted into the guide hole 33 from above the upper jig 30, and when the terminal fitting 10 and the bus bar 20 are correctly joined (pressure contact is completed), the tapered portion of the die 50 is a guide. The holes 33 are fitted with no play in the front-rear and left-right directions.

  The lower surface of the die 50 is a pressing surface 52 that is concentric with the die 50. The pressing surface 52 is a flat surface perpendicular to the direction in which the joints 11 and 21 are pressed by the die 50. The pressing surface 52 and the tapered outer peripheral surface 51 of the die 50 are connected via an arcuate surface 53. Further, at least a region (outer peripheral surface 51, pressing surface 52, and arcuate surface 53) in contact with the terminal fitting 10 on the surface of the die 50 is for reducing the frictional resistance with the upper surface of the joint portion 11 of the terminal fitting 10. As a means, mirror finishing is performed.

  The die 50 is attached to a hydraulic cylinder 60 (driving means which is a constituent element of the present invention). The hydraulic cylinder 60 includes a cylinder body 61, a piston 62 that moves up and down inside the cylinder body 61, and a rod 63 that is fixed to the piston 62 and protrudes downward from the cylinder body 61. A load cell 65 (load measuring means which is a constituent element of the present invention) for measuring a vertical compressive load is attached to the lower end of the rod 63. A die 50 is fixed coaxially with the rod 63 on the lower surface of the load cell 65. The hydraulic cylinder 60 raises and lowers the die 50, the load cell 65, and the die 50 by moving the rod 63 up and down by supplying and discharging hydraulic oil. The load cell 65 detects an upward reaction force from the terminal fitting 10 when the die 50 presses the terminal fitting 10.

  Next, a hydraulic circuit for supplying hydraulic oil to the hydraulic cylinder 60 will be described. A suction pump 71 that can be switched between a high speed and a low speed is connected to a tank 70 that stores hydraulic oil. The high speed side pressure feed path 72 and the low speed side pressure feed path 73 each have a check valve 74 and merge at the downstream end, and the merge pressure feed path 75 is connected to the cylinder body 61 via the direction switching valve 76 and the flow rate control valve 77. Is connected to the pressure chamber 61 a above the piston 62. Further, the pressure feed path 78 connected to the pressure chamber 61 b below the piston 62 in the cylinder body 61 is connected to the relief tank 79 via the direction switching valve 76. A relief tank 82 is connected to the high speed side pressure feed path 72 and the low speed side pressure feed path 73 via flow control valves 80 and 81, and another flow rate control valve 83 is connected to the low speed side pressure feed path 73. Yes.

Next, the operation of this embodiment will be described.
When the metal fitting A is manufactured by joining the terminal fitting 10 and the bus bar 20, the joining regions 11a and 21a (die 50) in the joining portions 11 and 21 are used by using a scraper, a wire brush, a buff or the like. And the corresponding area) is polished. By performing this polishing treatment, the oxide film on the surfaces of the joint portions 11 and 21 is removed, the joint strength is increased, the degree of adhesion is increased, and the electrical resistance is reduced.
After the surface polishing process, the joint 21 of the bus bar 20 is set in the cavity 41 of the lower jig 40, the joint 11 of the terminal fitting 10 is overlaid on the upper surface of the joint 21, and the upper jig 30 is placed thereon. The upper and lower jigs 30 and 40 are combined, and the lower surface of the upper jig 30 and the upper surface of the lower jig 40 are brought into contact with each other in a surface contact state. In this state, both the joints 11 and 21 overlap with each other in a surface contact state, and are held between the upper and lower jigs so as not to be rattled up and down and warped in the vertical direction. Deformation is regulated.

  When the die 50 is advanced (lowered) into the guide hole 33 from this state, the pressing surface 52 at the lower end of the die 50 presses the upper surface (front surface) of the joining portion 11 of the terminal fitting 10 from above, and this While the upper surface of the joint portion 11 of the terminal fitting 10 is deformed by the pressing action, the joint portion 21 of the bus bar 20 pressed against the deformed portion of the joint portion 11 is also deformed following. At this time, the deformation amount of the joint portion 21 of the bus bar 20 having low hardness is larger than the deformation amount of the joint portion 11 of the terminal fitting 10.

  When the die 50 is lowered to the joining completion position, a circular recess B is formed on the upper surface of the joining part 11 of the terminal fitting 10. As described above, when both the joint portions 11 and 21 are deformed by the die 50, the lower surface of the joint portion 11 of the terminal fitting 10 and the upper surface of the joint portion 21 of the bus bar 20 correspond to the pressing surface 52 of the die 50. In the substantially circular joining regions 11a and 21a, the metal fittings A and the bus bar 20 are integrated with each other so that the metal joined body A is manufactured.

  In addition, in the process in which the die 50 enters the joint portion 11 of the terminal fitting 10 as described above, the volume of the joint portions 11 and 21 including the amount of penetration of the die 50 (the amount of penetration into the cavities 31 and 41) increases. The upper jig 30 is elastically deformed so as to swell upward due to an increase in internal pressure of the joint 11. At the same time, the joints 11 and 21 pressed by the die 50 are extended and deformed while being displaced so as to flow radially from the center of the pressing surface 52 toward the outer peripheral side. At this time, the upper jig 30 and the lower jig are deformed. Since the joint portions 11 and 21 are restricted from extending in the front-rear and left-right directions by the restricting portions 32 and 42 of the tool 40, the deformed portion that has flowed radially from the center of the pressing surface 52 extends upward along the outer periphery of the die 50. Will be displaced. Due to the upward displacement, the portions of the joint portions 11 and 21 excluding the joint regions 11 a and 21 a corresponding to the pressing surface 52 of the die 50 are displaced upward so as to follow the upper jig 30. A very small gap (not shown) is generated between the portion displaced upward and the lower surface of the cavity 41 of the lower jig 40. As described above, the deformed portion 21b is formed on the lower surface of the joint portion 21 of the bus bar 20 so as to swell the substantially circular region corresponding to the pressing surface 52 of the die 50 downward (in the same direction as the pressing direction of the die 50). .

  Now, the joining strength between the terminal fitting 10 and the bus bar 20 that have been joined is determined by the adhesion strength in the joining regions 11 a and 21 a of the terminal fitting 10 and the bus bar 20. Factors that change the adhesion strength of the joining regions 11a and 21a include the speed of penetration of the die 50 into the terminal fitting 10 and the bus bar 20, the amount of penetration of the die 50, and the pressure holding time for maintaining the state in which the die 50 has entered most. In addition, there is a pressing force of the die 50 applied to the terminal fitting 10 and the bus bar 20, and among them, the pressing force of the die 50 particularly greatly affects the pressure contact strength.

  Therefore, in this embodiment, as a means for managing the pressing force of the die 50, a load cell as a load measuring means is provided between the die 50 and the rod 63 of the hydraulic cylinder 60 that applies a driving force to the die 50 in the pressing direction. The amount of penetration of the die 50 into the terminal fitting 10 and the bus bar 20 is managed based on the measured value of the load cell 65. Thereby, in the joining area | regions 11a and 21a corresponding to the pressing surface 52 of the die | dye 50 among the terminal metal fitting 10 and the bus-bar 20, the reaction force resisting the pressing force from the die | dye 50 moves to the die | dye 50 side from the joining area | region 11a, 21a side. This reaction force is measured by the load cell 65. As shown in the graph of FIG. 2, as the amount of penetration of the die 50 increases, the press-fitting reaction force (pressure contact force) from the terminal fitting 10 side also increases, and the value of this press-fitting reaction force is measured by the load cell 65. Is done. In this embodiment, for example, when the press-fitting reaction force reaches 21.6 kN, the further intrusion operation of the die 50 is stopped. The amount of penetration of the die 50 at this time is, for example, 3.2 mm. Thereafter, for example, a holding time of about 6 seconds is provided, and during this holding time, the amount of penetration of the die 50 (for example, 3.2 mm) and the press-fitting reaction force (21.6 kN) are maintained.

  The press-fitting reaction force from the joining regions 11a and 21a with respect to the pressing force applied from the die 50 to the terminal fitting 10 and the bus bar 20 indicates the adhesion strength in the joining regions 11a and 21a, that is, the joining strength. Then, the press-fitting reaction force from the joining regions 11a and 21a is accurately measured by the load cell 65, and the penetration depth of the die 50 is adjusted based on the measured value. Bond strength can be managed accurately.

  Further, restricting portions 32 and 42 for restricting the terminal fitting 10 and the bus bar 20 from being deformed so as to enlarge the projected shape (the shape of the upper surface of the joining portions 11 and 21) viewed in the die pressing direction; Using jigs 30 and 40 provided with restricting portions 34 and 43 for restricting the bus bar 20 from being deformed so as to warp in the direction opposite to the pressing direction of the die 50 around the concave portion B. By pressing the set terminal fitting 10 and the bus bar 20 with a die 50 and increasing the internal pressure of the terminal fitting 10 and the bus bar 20, both 10 and 20 are joined. By providing such restricting portions 32, 34, 42, and 43, when pressed by the die 50, the joint portions 11 and 21 of the terminal fitting 10 and the bus bar 20 expand the projected shape viewed in the die pressing direction. Therefore, the shape and size of the pressure-welded metal joined body A are not suitable because the deformation is restricted to be deformed so as to be warped in the direction opposite to the pressing direction of the die 50 around the recess B. Stable deformation does not occur. Therefore, there is no possibility that the joining strength varies due to unstable spread deformation of the joining regions 11a and 21a, and the joining strength based on the measured value of the load cell 65 can be managed accurately.

Further, when the terminal fitting 10 or the bus bar 20 is deformed so as to be depressed by being pressed by the die 50, the region pressed by the die 50 of the terminal fitting 10 or the bus bar 20 is extended and deformed while being displaced from the center to the outer peripheral side. . Here, when the die 50 directly presses the bus bar 20 having low hardness, the bus bar 20 that easily deforms a large part of the extension amount due to the intrusion of the die 50 takes charge. There is a concern that excessive slippage occurs at the contact interface, and as a result, the bonding strength varies.
On the other hand, in this embodiment, since the terminal metal fitting 10 with high hardness is pressed with the die 50, when the terminal metal fitting 10 with high hardness is deformed so as to be recessed, the bus bar 20 with low hardness also accompanies it. Deforms to follow and be recessed. Therefore, the extension amount of the terminal fitting 10 and the extension amount of the bus bar 20 are substantially the same, and an excessive slip does not occur on the contact surface between the terminal fitting 10 and the bus bar 20, so that the bonding strength between the terminal fitting 10 and the bus bar 20 is reduced. In other words, the bonding strength can be accurately managed based on the measurement value of the load cell 65.

  In addition, the die 50 sinks into the upper surface (front surface) of the joint portion 11 of the terminal fitting 10, but the outer peripheral surface 51 of the die 50 has a taper shape whose diameter decreases in the pressing direction with respect to the joint portion 11. As a result, the dice 50 are smoothly submerged into the joint 11.

  Moreover, since the area | region pressed by the pressing surface 52 of the die | dye 50 among the junction parts 11 of the terminal metal fitting 10 flows from the center of the pressing surface 52 to an outer peripheral side, and deform | transforms so that it may flow along the outer peripheral surface 51 of the die | dye 50. However, in this embodiment, since the pressing surface 52 and the outer peripheral surface 51 of the die 50 are connected via the arc-shaped surface 53, the deformation that the joint portion 11 flows is stably performed. It is possible to accurately manage the bonding strength based on the measured value.

  Moreover, the area | region pressed by the press surface 52 of the die | dye 50 among the junction parts 11 of the terminal metal fitting 10 deform | transforms so that it may flow along the surface (the press surface 52 and the taper-shaped outer peripheral surface 51) of the die | dye 50. However, in this embodiment, since the surface of the die 50 is mirror-finished, the frictional resistance between the die 50 and the joint portion 11 is reduced, and the deformation such that the joint portion 11 flows is stably performed. As a result, it is possible to accurately manage the bonding strength based on the measurement value of the load cell 65.

  Moreover, although the area | region pressed by the pressing surface 52 of the die | dye 50 among the junction parts 21 of the bus bar 20 deform | transforms so that it may flow along the inner surface of the cavity 41 of the lower jig | tool 40, in this embodiment, it is a lower part. Since the contact surface of the jig 40 with the joint portion 21 is mirror-finished, the frictional resistance between the lower jig 40 and the joint portion 21 is reduced, and the deformation that the joint portion 21 flows is stably performed. As a result, it is possible to accurately manage the bonding strength based on the measured value of the load cell 65.

<Other embodiments>
The present invention is not limited to the embodiment described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.
(1) In the above embodiment, the case where two metal plate materials are stacked has been described. However, according to the present invention, three or more metal plate materials can be stacked.
(2) Of the two metal plates having different hardnesses in the above embodiment, the metal plate having the higher hardness is disposed on the surface side pressed by the die. According to the present invention, the metal having the lower hardness is provided. You may arrange | position a board | plate material to the surface side pressed with a die | dye.
(3) In the above embodiment, the cross-sectional shape of the dice is circular, but according to the present invention, the cross-sectional shape of the dice may be non-circular (for example, elliptical, oval, rectangular, polygonal, etc.).
(4) Although the case where the hardness of a metal plate material differs was demonstrated in the said embodiment, according to this invention, you may comprise a metal joined body by overlapping the metal plate material with the same hardness. In this case, the metal plate members may be the same material or different materials.
(5) Although the case where the terminal fitting and the bus bar are joined has been described in the above embodiment, the present invention can also be applied to cases where the metal plate material is other than the terminal fitting or the bus bar.
(6) The specific dimensions, angles, and hardness of the above embodiment are only examples, and according to the present invention, the dimensions, angles, and hardness can be arbitrarily set.

Overall configuration diagram of Embodiment 1 Graph showing the relationship between pressure contact force and die penetration amount over time Sectional view of the terminal bracket and busbar before pressure contact Sectional view of the terminal fitting and busbar in a pressed state Sectional drawing of the state before pressure welding of the metal plate material in a conventional example Sectional drawing of the state where the pressure contact of the metal plate in the conventional example has been completed

Explanation of symbols

A ... Metal bonded body B ... Recessed portion 10 ... Terminal fitting (metal plate material)
20 ... Bus bar (metal plate)
DESCRIPTION OF SYMBOLS 30 ... Upper jig 32 ... Restriction part 40 ... Lower jig 42 ... Restriction part 50 ... Die 52 ... Pressing surface 53 ... Arc-shaped surface 60 ... Hydraulic cylinder (driving means)
65. Load cell (load measuring means)

Claims (9)

A cold welding method of manufacturing a metal joined body by joining a plurality of superimposed metal plate materials by pressing them with a die in a direction intersecting the plate surface so as to form a concave portion on the surface side. Because
A load measuring means is interposed between the die and the driving means for applying a driving force in the pressing direction to the die,
A cold welding method characterized in that the amount of penetration of the die into the metal plate material is managed based on the measurement value of the load measuring means. Using a jig provided with a restricting portion that restricts the metal plate material from deforming so as to enlarge the projected shape seen in the die pressing direction,
The cold welding method according to claim 1, wherein the metal joined body is manufactured by pressing the plurality of metal plate members set on the jig with the die. The cold welding method according to claim 1 or 2, wherein a metal plate having a higher hardness among the two metal plates having different hardnesses is disposed on a surface side pressed by the die. . The plurality of metal plate members are pressed by the die in a state of being set on a jig provided with a restriction portion that restricts deformation around the recess so as to be warped in the direction opposite to the pressing direction of the die. The cold welding method according to any one of claims 1 to 3, wherein the cold welding is performed. Cold for manufacturing a metal joined body by joining a plurality of superposed metal plate materials with a die in a direction intersecting the plate surface while deforming so as to form a recess on the surface side. A pressure welding device,
A load measuring means is interposed between the die and the driving means for applying a driving force in the pressing direction to the die,
A cold welding apparatus characterized in that the amount of penetration of the die into the metal plate material is managed based on the measurement value of the load measuring means. 6. The cold welding apparatus according to claim 5, further comprising a jig having a restricting portion that restricts deformation of the metal plate material so as to enlarge a projected shape viewed in the die pressing direction. The surface facing the metal plate material in the die is a flat pressing surface substantially perpendicular to the pressing direction,
The cold press welding apparatus according to claim 5 or 6, wherein the outer peripheral surface of the die and the pressing surface are connected via an arcuate surface. The cold welding apparatus according to any one of claims 5 to 7, wherein a surface of the die is mirror-finished. 6. The apparatus according to claim 5, further comprising a jig having a restricting portion for restricting the plurality of metal plate members from being deformed so as to be warped in a direction opposite to a pressing direction of the die around the concave portion. Item 9. The cold welding apparatus according to any one of Items 8 to 8.

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