| 摘要 |
<p>To provide a die for a self-piercing rivet fastening device (1) which uses a self-piercing rivet (10) to fasten fastened members (41, 42) with poor malleability formed using a die cast or the like so that the members do not rupture. The present invention is a die (30; 35) for a self-piercing rivet fastening device (1) having a die (30; 35) and a punch (4) for driving a self-piercing rivet (10) having a large-diameter head (11) and hollow cylindrical legs (12) extending down from the head, and configured so the punch drives the self-piercing rivet (10) into fastened members (41, 42) arranged on top of the die (30; 35), wherein a cavity (31; 36) is formed in the upper surface of the die (30; 35) for receiving portions of the fastened members (41, 42) thrust out by the self-piercing rivet (10) driven by the punch (4), and wherein the cavity (31; 36) is formed as a concave spherical surface having a single radius (R) centered on the central axis (I) of the cavity. Alternatively, the cavity (36) is formed with a bottom surface (37) and a surrounding inclined surface (38), and the angle between the bottom surface and the inclined surface is from 165 to 175°.</p> |
