Thread forming method and apparatus

Details Thread forming method and apparatus Thread forming method and apparatus

B - Operations, Transporting

23

G

B23G 1/00 (2006.01) B21H 3/06 (2006.01)

Patent

CA 2077733

A method of producing threaded fasteners which results in seam free threads. The method employs a rolling die with a novel double form thread profile geometry wherein the angle of divergence of the groove defining walls of the die gradually varies between an obtuse pointing angle and an acute finish angle as the groove depth increases from a starting depth to the finish depth. The finish form of the die is maintained for a length which is commensurate with at least two and one-half revolutions of the fastener which is being formed.

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