Patent ID: 7631532

Claim:
The method of head trimming a fastener workpiece in a cold-forging apparatus comprising: placing a fastener workpiece into a bore of a stationary punch at a final processing station of a cold-forging apparatus, said punch having an end face; retainably holding a barrel portion of the fastener in the bore; supporting an underside of a head of said fastener workpiece against said punch end face; moving a die having an internal passage and a trim plate with an aperture having a circumferential polygonal cutting edge closely corresponding to the outside dimension of a shank of said punch toward said fastener workpiece, said trim plate aperture being moveable coaxially relative to said punch from a retracted position toward a top side of said fastener workpiece to an extended trim position; and passing said punch and said fastener head through said trim plate aperture to the extended trim position where said cutting edge lies beyond an underside of the head of the fastener workpiece, thereby trimming excess material from said head.