Method of forming internal spline shaft
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United States of America Patent
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Mar 24, 1998
Grant Date -
N/A
app pub date -
Jan 10, 1997
filing date -
Apr 12, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of forming an internal spline shaft, comprising forming splines on an inner circumferential portion of a hollow stock by cold forging in such a way that a clearance 'a' between an inner diameter of the hollow stock and an outer diameter of a tool guide portion, a difference 'b' between a reduced diameter of a forming land and the inner diameter of the hollow stock, and a forming-land approach angle .theta. satisfy respectively specific relationships. By this method, products having internal long splines can be obtained in a high yield by cold forging method.
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