Method and apparatus for extrusion of gears

Metal deforming – By use of closed-die and coacting work-forcer

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2989334, B21K 130

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active

054088577

ABSTRACT:
A method is disclosed for forming helical or spur gears. The method comprises providing a die having a toothed region, positioning a first blank in the toothed region of the die, inserting second and third blanks adjacent the first blank, and applying a force to the third blank. The toothed region of the die includes die teeth projecting into an internal bore of the die, and the force is applied to the third blank to move the second blank through the die until a leading end of the third blank is generally coincidental with a minimum diameter portion of the toothed region. During the application of force to the third blank, the second blank is moved through the toothed region of the die to form external teeth in the blank, and the first blank is ejected from the toothed region. Preferably, the toothed region of the die includes a tapered rake face section and a full depth section, and the minimum diameter portion of the toothed region occurs at an intersection of the tapered rake face section and the full depth section. An apparatus embodying this method is also disclosed.

REFERENCES:
patent: 3605475 (1971-09-01), Eakin et al.
patent: 3910091 (1975-10-01), Samanta
patent: 3911715 (1975-10-01), Tranter
patent: 4509353 (1985-04-01), Ike et al.
patent: 4546635 (1985-10-01), Arita et al.
patent: 4878370 (1989-11-01), Fuhrman et al.
patent: 5295382 (1994-03-01), Fuhrman

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