Raised-center axle and process for forming

Details Raised-center axle and process for forming Raised-center axle and process for forming

2008-07-22

2008-07-22

Bellinger, Jason R (Department: 3617)

Metal deforming

By relatively movable offset tool-faces

With tool motion in fixed path

C072S369000

Reexamination Certificate

active

07401490

ABSTRACT:
A cold-formed, raised-center axle for a heavy-duty vehicle includes a central tube having a pair of ends, a pair of spindles attached to the central tube ends, and a wall thickness of from about 0.500 to about 0.625 inches. A hump is formed in the center portion of the tube and includes compressive residual stresses in its bottom portion when the axle is in an in-service position. A method for forming the raised-center axle includes the steps of providing a substantially straight axle, inserting the axle into a press, over-forming a hump in the axle in the direction such that camber is induced in the axle, and forming the axle in a second direction, thereby substantially removing the camber and replacing a detrimental residual stress state in the humped portion of the axle with a beneficial residual stress state.

REFERENCES:
patent: 2631898 (1953-03-01), Long
patent: 3667269 (1972-06-01), Bergner
patent: 3869776 (1975-03-01), Moshnin et al.
patent: 3966260 (1976-06-01), Braun
patent: 3991602 (1976-11-01), Harcuba et al.
patent: 6807839 (2004-10-01), Takamatu
patent: 91/17898 (1991-11-01), None

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