Method of manufacturing torsion bar for vehicle steering...

Details Method of manufacturing torsion bar for vehicle steering... Method of manufacturing torsion bar for vehicle steering...

2007-01-09

2007-01-09

Crane, Daniel C. (Department: 3725)

Metal deforming

By pulling workpiece through closed periphery die

With cutting

C072S340000, C029S897200, C267S273000, C074S3880PS

Reexamination Certificate

active

10501654

ABSTRACT:
A method of manufacturing a torsion bar includes a first shaping step of reducing a diameter of a round bar steel material according to cold drawing work so as to have a hardness including an inside through a surface layer of 320 or more to 450 or less by Vickers hardness (HV), and a second shaping step of cutting a midway area of the steel material in the longitudinal direction so as to obtain a spring portion.

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