Substrate joining method using rivet, and joining structure

A joining method of plate materials using a rivet comprising:

• punching respective plate materials that are laid one on another with joining surfaces being in contact with each other by a rivet shaft portion of a rivet that includes a rivet head portion and the rivet shaft portion;
• forming a crimp portion at a front end of the rivet shaft portion;
• and
• fastening and joining the plate materials between the rivet head portion and the crimp portion;
• wherein
• one of the plate materials is a laminated plate material made of carbon fiber reinforced plastic and the other of the plate materials is a metal plate,
• a flat plate seat member is laid on and brought into contact with an opposite surface of the laminated plate material relative to the joining surface thereof, the seat member having an inner hole through which the rivet shaft portion is allowed to pass, the inner hole having an inner diameter equal to the change of the inner diameter thereof,
• the seat member is used as a supporting jig at the time of the punching to apply a clamping force to the laminated plate material by the seat member including an edge side of the inner hole being in contact with the opposite surface,
• the punching by means of the rivet shaft portion is performed along the inner hole of the seat member while applying the clamping force, and
• the joining is performed so that the seat member is left between the rivet head portion or the crimp portion and the opposite surface of the laminated plate material.

A joining method of plate materials using a rivet comprising:

• punching respective plate materials that are laid one on another with joining surfaces being in contact with each other by a rivet shaft portion of a rivet that includes a rivet head portion and the rivet shaft portion:
• forming a crimp portion at a front end of the rivet shaft portion;
• and
• fastening and joining the plate materials between the rivet head portion and the crimp portion;
• wherein
• one of the plate materials that is on the rivet head portion side is a laminated plate material made of carbon fiber reinforced plastic and the other of the plate materials is a metal plate,
• a portion between a bottom surface of the rivet head portion and a circumferential surface of the rivet shaft portion has a right angle without a curve,
• an opposite surface of the laminated plate material relative to the joining surface thereof is brought into contact with a lower mold having an inner hole through which the rivet shaft portion is allowed to pass, the inner hole having an inner diameter equal to the rivet shaft portion and brought into contact with the opposite surface without a change of the inner diameter thereof,
• the metal plate is used as a supporting jig at the time of the punching to apply a clamping force to the laminated plate material between the metal plate and the lower mold by the lower mold including an edge side of the inner hole being in contact with the opposite surface,
• the punching by means of the rivet shaft portion is performed along the inner hole of the lower mold from an opposite surface of the metal plate relative to the joining surface thereof while applying the clamping force, and
• a seat member is fitted to the rivet shaft portion protruding from the laminated plate material to form the crimp portion.