Die member

摘要

A die member 180 for use in attaching self-piercing fasteners to panels includes a panel supporting shoulder 182 and a central die portion 184 projecting from an annular die cavity 186. The outer surface 188 of the die cavity is inclined inwardly from the panel supporting shoulder 182, and blends into the panel supporting shoulder 182 in a smooth arcuate surface 190. The free end of the central projecting die portion 184 includes a convex conical surface 192 having a relatively sharp apex 194. The outer edge of the central projecting die portion 184 has a sharp piercing or shearing edge 196. The bottom surface 202 of the annular die cavity terminates in an annular lip 204 adjacent the inclined outer surface 188. The annular lip 204 blends into the bottom surface 202 and the outer sloping die surface 188 through arcuate surfaces.