Self thread creating fastener and method and apparatus for...

Details Self thread creating fastener and method and apparatus for... Self thread creating fastener and method and apparatus for...

B - Operations, Transporting

21

H

10/3, 10/37

B21H 3/02 (2006.01) F16B 25/00 (2006.01)

Patent

CA 1168002

A B S T R A C T A thread forming screw having a helical thread and a tapered lead-in section with a polygonal cross section is formed from a conventional blank by rolling the blank between a pair of thread rolling dies having means thereon to form alternating convex lobes and concave relief areas in the frus- to-conical surface of the blank. Thus, the screw may be formed with a polygonally shaped threading end without a prior working of the blank's frusto-conical surface. Curved ramp surfaces smoothly interface the lobes and concavities to allow metal in a workpiece being threaded to roll into the concavities there- by reducing the torque needed to form a thread in the workpiece,

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