Method of manufacturing spline shaft
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United States of America Patent
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Jan 8, 2002
Grant Date -
N/A
app pub date -
Dec 20, 1996
filing date -
Apr 12, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of manufacturing a spline shaft, comprising ironing a hollow stock by cold forging and forming splines in a desired portion of said hollow stock by cold forging by using its work harden state. This method makes it possible to reduce the weight of a product by using a hollow stock, and to prevent buckling of the material of the hollow stock during the formation of splines owing to work-hardening caused by the ironing. Further, a predetermined root strength can be ensured without requiring induction hardening. Accordingly, a reduction in weight is achieved, and the production speed and yield are improved.
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