| 摘要 |
PROBLEM TO BE SOLVED: To make the depth of a cavity and the height of a rise adjustable, by one type of die, in accordance with caulking conditions such as the material and thickness of each member to be fastened, the number of sheets and thickness of the entire members to be fastened, and a caulking load on the entirety. SOLUTION: The automatic piercing rivet fastening device fastens a plurality of members 3a, 3b to be fastened which are stacked on the top face of a die 7, by a self-piercing rivet 8 pressed down by a punch 6. In this device, the die 7 is divided into a bottom wall 10 and a circumferential side wall 11 that surrounds the bottom wall along the circumferential direction; and, in the axial center of the bottom wall 10, there is installed freely vertically movably a push-up member 14 which is for caulking/deforming outward in the radial direction a caulking part at the tip end of the fastening axis 8a of the self-piercing rivet 8. The bottom wall 10 and the circumferential side wall 11 are fitted so as to be freely elevated or lowered mutually, thereby making it possible to change the depth of the cavity 12 formed by the walls 10, 11 and the thrusting height of the push-up member 14 against the cavity 12, in accordance with the sheet combination of the members 3a, 3b to be fastened. COPYRIGHT: (C)2004,JPO
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