Rolling dies and method of forming the same

Details Rolling dies and method of forming the same Rolling dies and method of forming the same

1981-08-12

1983-10-25

Larson, Lowell A.

Metal deforming

By use of roller or roller-like tool-element

Comprising tool movable relative to stationary work-portion...

72 88, 72469, B21H 306

Patent

active

044111479

ABSTRACT:
The present invention provides an improved method of forming improved dies for rolling an article, such as a lock thread convolution. The dies are formed by rolling a circular hob along a flank of a thread form ridge on the die. As the hob is rolled along the thread form ridge, teeth on the hob are pressed against the thread form ridge with a constant force to form uniform indentations and/or projections in the thread form ridge. The indentations and/or projections which are formed in the thread form ridge by the hob all have the same configuration since the hob is pressed against the thread form ridge with a force of a constant magnitude as the hob is rolled along the thread form ridge. During the rolling of an external thread convolution on a bolt blank with the improved die, the indentation and/or projections on the thread form ridge shape teeth on the flank of an external thread convolution on the bolt. Since the indentations and/or projections were originally rolled into the thread formed ridges on the die with a circular hob and since the indentations and/or projections on the die roll teeth on a circular bolt blank, the teeth formed on the flank of the external thread convolution have the same configuration as the teeth on the hob.

REFERENCES:
patent: 2183689 (1939-12-01), Olson
patent: 3339389 (1967-09-01), Mosow
patent: 3405545 (1968-10-01), Orlomoski
patent: 3653241 (1972-04-01), Orlomoski
patent: 3896656 (1975-07-01), Orlomoski
patent: 4136416 (1979-01-01), Thomas
Industrial Fasteners Institute, Standard 109, issued May 3, 1968.

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