Patent ID: 7421875
Filing Date: 2008-09-09
Classification: B21J,B21K,Y10T

Abstract:
1. A fastener and a head-trimming device utilized in a cold-forging apparatus, comprising: a fastener workpiece having a barrel and a head; a stationary punch holder; a punch rigidly affixed to said punch holder and having a bore retainably holding the barrel portion of the fastener workpiece and further including a polygonal shank having an end face supporting an underside of the head portion of said fastener workpiece held in said bore prior to trimming; a die having an internal passage and a trim plate including an aperture, said trim plate aperture having a circumferential polygonal cutting edge closely corresponding to dimensions of the shank of said punch for receiving said punch and trimming excess material from said head portion of said workpiece, said die being movable coaxially relative to said punch from a retracted position toward a top side of said fastener to an extended trim position where said cutting edge lies beyond the punch end face; and a knock-out pin having an end reciprocal within said punch bore for ejecting said fastener workpiece from said bore and through said die passage to an opposite side of said die.