Manufacturing method of armature shaft, armature shaft and...

Details Manufacturing method of armature shaft, armature shaft and... Manufacturing method of armature shaft, armature shaft and...

2008-04-22

2008-04-22

Tolan, Ed (Department: 3725)

Metal deforming

By use of closed-die and coacting work-forcer

Forcing work into or within closed die; e.g., forging

C470S010000

Reexamination Certificate

active

07360389

ABSTRACT:
In a forging process step, a small diameter portion12is formed in the leading end portion of a cylindrical shaft material30, and an installation depressed portion11dis formed on a base end face of the shaft material30for installing a ball15therein to receive thrust force, by cold forging process using a forging mold31. In a worm forming process after the forging process step, a worm13is formed in the small diameter portion12by rolled dies. The small diameter portion12and the installation depressed portion11dare formed by cold forging process, so that an outer circumferential face of the small diameter portion12and an inner face of the installation depressed portion11dbecome even surfaces with small surface roughness.

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International Search Report dated Sep. 14, 2004.

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