Thread forming method and apparatus

Metal deforming – By use of tool acting during relative rotation between tool... – During rotation of work

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Details

72469, 72103, B21H 306

Patent

active

052438430

ABSTRACT:
A method of producing threaded fasteners, particularly screws characterized by a thread root which is substantially wider than the thread crest, 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 gradually varies between an obtuse pointing angle and an acute finish angle as the groove depth increases from a sorting 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.

REFERENCES:
patent: 618262 (1899-01-01), Ames
patent: 3204442 (1965-09-01), Wieber
patent: 4065948 (1978-01-01), Tsukamoto
patent: 4862718 (1989-09-01), La Croix

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