Title: Annular component fabricating method, die for use in such fabricating method and annular component fabricated thereby
Application Number: 200610160599 Application Date: 2006.10.08
Publication Number: 1943971 Publication Date: 2007.04.11
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: B23P13/00;B21D22/02;B21C23/02;B21J5/06;B21D28/02;B21K1/00;B21D37/10;B21C25/02;B21J13/02
Applicant(s) Name: Denso Corp. Address:
Inventor(s) Name: Takada Masahiro;Hideshima Yasuhiro
Attorney & Agent: caimin jun huangli hang
Abstract:
    A method of fabricating an annular component part 1 is disclosed wherein press forming is carried out to prepare an annular body 5A having a cylindrical wall 7, having a root portion and a distal end, and an annular flange portion 8. The fabricating method comprises expanding an inner circumferential periphery 7d of the cylindrical wall 7 to an inner diameter corresponding to an inner diametric concave portion 25 formed on the inner circumferential periphery 7d and squeezing the cylindrical wall 7 in a tapered profile such that the inner diameter 7d of the cylindrical wall 7 gradually decreases. During inner diametric expanding operation, an annular shoulder 7e is formed on the inner circumferential periphery 7d of the cylindrical wall 7 and plays a role as an undercut of the annular component 1.
Time: 21