METHOD OF FORMING SPLINE AND KEYWAY FOR SHEET METAL ROTATING MEMBER WITH BOSS PART

WIPO Patent Application WO/2003/064073

A1

A method of forming a boss side spline (5), comprising the steps of providing an annular excess part (7), inserting a spline−forming male die (10) into the boss part (2) of a sheet metal rotating member (1) having the root part (8) of the boss part (2) and a peripheral edge part (3) displaced from each other beforehand, setting the boss (2) to a fixed die (11) by fitting into the boss part fitting hole (9A) of a rotating member holding die (9), holding the annular excess part (7) by a pressing die (12) and the fixed die (11) to deform the annular surplus part in flat shape, and pushing the root part (8) of the boss part (2) into a spline−forming groove (10C) to elastically deform the root part so as to deform the boss side spline (5), whereby the wall thickness of the sheet metal material is avoided from increasing to assure the strength of the boss part and achieve a reduction in weight, a production efficiency can be increased remarkably, and chips can be eliminated to avoid adverse effects on a working environment.

KANEMITSU TOSHIAKI (JP)
FUJII NAOKI (JP)
IWATA KAZUO (JP)

PCT/JP2002/004113

August 07, 2003

April 25, 2002

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KANEMITSU CORP (JP)
KANEMITSU TOSHIAKI (JP)
FUJII NAOKI (JP)
IWATA KAZUO (JP)

B21J5/12; B21D17/02; B21J5/02; B21K1/30; B21K1/32; (IPC1-7): B21J5/02; B21D22/02; B21J5/12; B21K1/42

JPH03198941A	1991-08-30
JPH10296377A	1998-11-10
JPH1157914A	1999-03-02
JP2000225421A	2000-08-15
JPS646557A	1989-01-11
JP2001286961A	2001-10-16

Suzuye, Koichi (Osaka Fukokuseimei Building 2-4, Komatsubaracho, Kita-k, Osaka-shi Osaka, JP)

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