Method for manufacturing a worm shaft

Details Method for manufacturing a worm shaft Method for manufacturing a worm shaft

2007-06-19

2007-06-19

Crane, Daniel C. (Department: 3725)

Metal deforming

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

During rotation of work

Reexamination Certificate

active

11012188

ABSTRACT:
An object of the present invention is to provide a method of manufacturing a rotational shaft having a worm, wherein a worm portion has a small bending amount. According to the method of the invention, a worm portion is formed at a worm forming portion by a rolling process with rolling dies, and a small diameter portion is formed at least at one axial end of the worm forming portion, wherein a diameter of the small diameter portion is smaller than a diameter of a bottom of a worm tooth to be formed at the worm forming portion, so that surplus material portion of the worm forming portion can flow toward the small diameter portion.

REFERENCES:
patent: 3803889 (1974-04-01), Muenchinger
patent: 3875780 (1975-04-01), Cochrum et al.
patent: 4724694 (1988-02-01), Medal
patent: 6135892 (2000-10-01), Donovan
patent: A-2003-145242 (2003-05-01), None

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