Thread rolling die and method of thread rolling

Details Thread rolling die and method of thread rolling Thread rolling die and method of thread rolling

1976-05-24

1977-07-12

Mehr, Milton S.

Metal deforming

By use of tool acting during relative rotation between tool...

During rotation of work

72469, 10155A, B21D 1304

Patent

active

040345866

ABSTRACT:
A thread rolling die and a method of thread rolling is disclosed for producing the annular rib on a threaded fastener suitable for retaining washers, clips or the like. The ends of the threads adjacent to such rib blend to the root diameter of the thread. The annular rib is produced by axially displacing workpiece material from the adjacent end of the thread. The die for rolling the thread is formed with thread forming grooves which extend to a base line spaced from the parallel to the lateral side of the die. At the base line the thread forming grooves fade to zero depth. Positioned between the base line and the lateral side of the die is a rib of increasing width which functions to displace material axially into the required rib.

REFERENCES:
patent: 2283494 (1942-05-01), Erdmon
patent: 2371463 (1945-03-01), Olson
patent: 3538739 (1970-11-01), Orlonoski

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