Seam-free thread rolling dies

Details Seam-free thread rolling dies Seam-free thread rolling dies

1991-09-17

1993-02-02

Crane, Daniel C.

Metal deforming

Tool and/or tool holder

Tool-comprising die plate having ribs and/or grooves

72 88, 72103, B21H 306

Patent

active

051829371

ABSTRACT:
A seamless helical thread is formed through the use of a die having a thread profile defining groove which undergoes a smooth transition from a pointed form at the starting end to a finish form. The transition occurs along the portion of the groove length where the groove depth is increasing. In the case of a typical machine screw with a 60.degree. finish form, the pointed form is approximately 98.degree..

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

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