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EP-3603842-B1 - METHOD AND DEVICE FOR JOINING MEMBERS

EP3603842B1EP 3603842 B1EP3603842 B1EP 3603842B1EP-3603842-B1

Inventors

  • MAEDA, YASUHIRO
  • HASHIMURA, TORU
  • WATANABE, KENICHI
  • KIMURA, TAKAYUKI

Dates

Publication Date
20260506
Application Date
20180314

Claims (9)

  1. A method for joining members, the method comprising: providing a first member (10) that is provided with a hole portion (12a), a second member (20) that is hollow in shape, a guide shaft member (38), an elastic body (32) that has a through-hole (32a) through which the guide shaft member (38) can be inserted, a first plunger (34) that has a through-hole (34a) through which the guide shaft member (38) can be inserted, a second plunger (35) to which the guide shaft member (38) is connected, and a drive mechanism (36) that drives the guide shaft member (38); inserting the second member (20) into the hole portion (12a) of the first member (10); inserting the guide shaft member (38) into the through-hole (32a) of the elastic body (32); inserting the elastic body (32), into which the guide shaft member (38) is inserted, inside the second member (20); arranging an assembly (1) in which the first member (10), the second member (20), the elastic body (32), and the guide shaft member (38) are combined so as to horizontally extend; arranging the assembly (1) so as to be sandwiched by the first plunger (34) and the second plunger (35) in a direction where the guide shaft member (38) extends; and moving the second plunger (35) connected to the guide shaft member (38) toward the first plunger (34) by driving the guide shaft member (38) by the drive mechanism (36) in a state where the first plunger (34) is fixed, compressing the elastic body (32) by the first plunger (34) and the second plunger (35) in the direction where the guide shaft member (38) extends, and expanding the elastic body (32) radially outside the guide shaft member (38), thereby expanding and deforming at least a portion of the second member (20) that is inserted into the hole portion (12a) to join the second member (20) to the first member (10) by press-fitting, characterized in that the drive mechanism (36) further includes a cam mechanism (40, 42) that converts a force applied in a direction different from the direction where the guide shaft member (38) extends into a force in the direction where the guide shaft member (38) extends; the cam mechanism (40, 42) comprises a cam driver (40) and a cam slider (42), wherein the cam slider (42) is moved by the cam driver (40), and when the cam slider (42) is moved the guide shaft member (38) is driven; the cam slider (42) has a rail mechanism or wheel on its lower surface and is movable horizontally, wherein the cam slider (42) is moved by the cam driver (40) and the rail mechanism or the wheel; and the drive mechanism (36) compresses the elastic body (32) with the force whose direction has been converted by the cam mechanism (40, 42), wherein the cam slider (42) pulls the guide shaft member (38) to generate the compression force compressing the elastic body (32).
  2. The method for joining members according to claim 1, wherein: the cam driver (40) is movable vertically and has an inclined surface (40a) at its lower portion for transmitting a force to the cam slider (42), and the cam slider (42) has an inclined surface (42a) on its upper portion for receiving a force from the cam driver (40); and the cam driver (40) moves vertically and the cam slider (42) moves horizontally to drive the guide shaft member (38).
  3. The method for joining members according to claim 1, wherein: the drive mechanism (36) includes a biasing portion (46) that bias the guide shaft member (38) and the second plunger (35) in a direction where compression of the elastic body (32) is released; and when drive of the guide shaft member (38) by the drive mechanism (36) is released after the compression of the elastic body (32), the guide shaft member (38) and the second plunger (35) are returned to positions before the compression by a biasing force of the biasing portion (46).
  4. The method for joining members according to claim 1, wherein: the second member (20) is provided with a partition wall (22) that extends in a longitudinal direction of the second member (20) and partitions an internal space of the second member (20); and the elastic body (32), the guide shaft member (38), the first plunger (34), and the second plunger (35) are provided each corresponding to the number of the internal spaces partitioned by the partition wall (22).
  5. The method for joining members according to claim 1, wherein: a motion mechanism (54) that horizontally moves the guide shaft member (38) is further provided; and the motion mechanism (54) horizontally moves the guide shaft member (38), so that the guide shaft member (38) and the elastic body (32) inserted through the guide shaft member (38) are inserted inside the second member (20).
  6. The method for joining members according to claim 1, wherein an inner shape of the hole portion (12a) of the first member (10) and an outer shape of the second member (20) are similar in shape.
  7. The method for joining members according to claim 1, wherein an outer frame mold (52) is arranged outside the second member (20), and at least a part of the second member (20) is formed along the outer frame mold (52) to be joined by press-fitting.
  8. The method for joining members according to claim 1, wherein the elastic body (32) is separated at a joint portion between the first member (10) and the second member (20).
  9. A device for joining members, the device using an elastic body (32) that has a through-hole (32a) to join a first member (10) that is provided with a hole portion (12a) and a second member (20) that is hollow in shape by press-fitting, the device comprising: a guide shaft member (38) that can be inserted into the through-hole (32a) of the elastic body (32); a first plunger (34) that has a through-hole (34a) through which the guide shaft member (38) is inserted, the first plunger (34) having a fixed position and a first pressing surface with a flat shape; a second plunger (35) that is connected to the guide shaft member (38), the second plunger (35) having a movable position and a second pressing surface that has a flat shape and is opposed to the first pressing surface; and a drive mechanism (36) that drives the guide shaft member (38) to move the second plunger (35) toward the first plunger (34), characterized in that the drive mechanism (36) further includes a cam mechanism (40, 42) that converts a force applied in a direction different from the direction where the guide shaft member (38) extends into a force in the direction where the guide shaft member (38) extends; the cam mechanism (40, 42) comprises a cam driver (40) and a cam slider (42), wherein the cam slider (42) is adapted to be moved by the cam driver (40), and when the cam slider (42) is moved the guide shaft member (38) is driven; the cam slider (42) has a rail mechanism or wheel on its lower surface and is movable horizontally, wherein the cam slider (42) is moveable by the cam driver (40) and the rail mechanism or the wheel; and the drive mechanism (36) is adapted to compress the elastic body (32) with the force whose direction has been converted by the cam mechanism (40, 42), wherein the cam slider (42) pulls the guide shaft member (38) to generate the compression force compressing the elastic body (32).

Description

TECHNICAL FIELD The present invention relates to a method and a device for joining members. BACKGROUND ART High-strength thin steel sheets referred to as high-tension steels are used to reduce weight and improve safety of vehicles. Although the high-tension steels are effective in reducing weight and improving safety, they are still heavier than low-density materials such as aluminum. In addition, high strength of high-tension steel causes problems such as a decrease in formability, an increase in forming load, and a decrease in dimensional accuracy. In order to solve these problems, in recent years, there has been multi-materialization in which extrusion molded products, cast products, and press molded products using aluminum having a specific gravity smaller than that of steel sheets are used together with steel components. A problem in this multi-materialization is the joining of steel components and aluminum components. Welding techniques represented by spot welding produce fragile intermetallic compounds (IMC) at the interface between steel components and aluminum components, and hence joining techniques such as electromagnetic forming joining, screw fastening represented by bolts and nuts, friction stir joining (FSW), rivets, self-piercing rivets (SPR), mechanical clinching, and bonding have been put into practical use. In swaging by electromagnetic forming, a solenoid forming coil is inserted inside a pipe-shaped component fitted to a mating component, and an induced current is induced in a pipe of a conductor by a magnetic field that changes by applying an impact current to the coil. An electromagnetic force is generated between a magnetic field due to the primary current of the coil and an induced current flowing in the opposite direction to the circumferential direction of the pipe, and at this time, the pipe is subjected to a radially outward force, so that it is expanded and deformed, and is joined to the mating component by press-fitting. This joining method is suitable for copper and aluminum having high electrical conductivity, and is also practically used in joining of some automobile components. Patent Document 1 discloses a swaging and joining technique by electromagnetic forming for multi-materialization. Specifically, a metal bumper reinforcement with a hollow cross section is expanded and deformed by electromagnetic forming, and is fitted and joined to a hole portion provided in an aluminum bumper stay. PRIOR ART DOCUMENT PATENT DOCUMENT PATENT DOCUMENT 1JP 2007-284039 APATENT DOCUMENT 2GB 2 291 368 APATENT DOCUMENT 3JP S51 133170 APATENT DOCUMENT 4JP S60 257935 APATENT DOCUMENT 5JP H07 323343 APATENT DOCUMENT 6JP 2011 105302 APATENT DOCUMENT 7JP S58 184025 APATENT DOCUMENT 8JP S52 98672 APATENT DOCUMENT 9DE 10 2013 105481 A1 GB 2 291 368 A discloses a method of joining members according to the preamble of claim 1. JP S51 133170 A discloses a drive mechanism comprising a horizontally arranged punch member to compress an elastic body. The side of the punch member that is opposite to the elastic body, is an inclined face. On this inclined face, an inclined face of a vertically moved pressing blade is contacting. If the pressing blade is vertically moved, due to the inclined faces, the punch member is horizontally moved to press the elastic body. JP S60 257935 A discloses a rod for pressing a pipe expanding rubber. A drive mechanism comprises a connecting pipe screwed on the rod, and a piston screwed on the connecting pipe. The piston is moved in horizontal direction by an oil feeding mechanism. JP H07 323343 A discloses a tube expanding device that comprises mandrels for tube expanding which are provided with a tube expanding billet on one end side and a locking part on the other end side, a press-fit table at which the mandrels are arranged, and a reciprocating means which reciprocates the press-fit table. JP 2011 105302 A discloses a drive mechanism in a tube expanding die comprising split dies with a wedge inserting portion extending in axial direction. A mandrel for driving the tube expanding die radially outward has wedges that correspond to the wedge inserting portions of the split dies. Each of the wedges is formed into a taper shape tapered narrower toward the front side. The wedges are inserted into the wedge inserting portions of the split dies. Thereby the segments of the split dies are caused to be pressed in the radially outward direction with the corresponding wedges. JP S58 184025 A discloses a drive mechanism comprising a piston-like working rod pulled in horizontal direction by a hydraulic cylinder. JP S52 98672 A discloses a drive mechanism comprising a moveable piston rod that moves several elastic bodies for pipe expanding. The piston rod is moved in an axial direction (F) by a pulling means. DE 10 2013 105481 A1 teaches a drive mechanism comprising a pulling rod having a thread. A nut is screwed on the thread to pull the pulling rod (in a horizontal direction). SUMMAR