Metal deforming – By extruding through orifice – Utilizing internal forming means
Patent
1997-01-10
1998-03-24
Larson, Lowell A.
Metal deforming
By extruding through orifice
Utilizing internal forming means
2989334, B21K 130
Patent
active
057300186
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.
REFERENCES:
patent: 4878370 (1989-11-01), Fuhrman et al.
patent: 4924690 (1990-05-01), Kanamaru et al.
Kobayashi Akio
Morozumi Katsuyuki
Larson Lowell A.
Mitsubishi Steel Mfg. Co. Ltd.
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