Threaded – headed fastener – or washer making: process and apparat – Implement – e.g. – die – etc. – Bolt or rivet forming die
Patent
1999-11-30
2000-07-18
Tolan, Ed
Threaded, headed fastener, or washer making: process and apparat
Implement, e.g., die, etc.
Bolt or rivet forming die
470 57, 72344, B21J 1302
Patent
active
060899867
ABSTRACT:
A header die for forming a self-tapping fastener blank provides die forming zones within which the blank is formed, the blank therby defining an odd number of lobes along a cross section taken perpendicular to its axis of rotation. The lobes define a relatively high out-of-round cross section along a tapered thread-forming zone, and a relatively low out-of-round cross section along the main body taken in a direction toward the drive head. Between the main body and tapered thread-forming zone is located an additional thread forming zone having an axial length of approximately one thread pitch and a cross section that conforms to the high out-of-round of the tapered zone. The maximum diameter (at the lobes) of the additional thread-forming section approximately matches that of the full-diameter main body section. A lower-diameter stabilizing section can be provided ahead of the tapered zone, adjacent the tip of the fastener.
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Pritchard Alan
Reynolds John R.
Conti Fasteners, A.G.
Tolan Ed
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