| 摘要 |
A cold-formed, raised-center axle (10) for a heavy-duty vehicle includes a central tube (12) having a pair of ends, (14) a pair of spindles (18) attach ed to the central tube ends, (14) 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 (12) and includes compressive residual stresses in its bottom portion when the ax le is in an in-service position. A method for forming the raised-center axle (1 0) includes the steps of providing a substantially straight axle, (10) insertin g 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 (10) wit h a beneficial residual stress state.
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