Title:
複合磁性部材,その製造方法及びこの複合磁性部材を用いた電磁弁
Document Type and Number:
Japanese Patent JP4014686
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a composite magnetic member, its manufacturing method and a solenoid valve using this composite magnetic member in which the performances of a ferromagnetic part and nonmagnetic part is held and which is excellent in the resistance to stress corrosion crack. SOLUTION: A hollow shaped intermediate formed body 10 which has the ferromagnetic part 2 and non-magnetic part 3 and whose non-magnetic part 3 is constricted in the inside direction is manufactured, next, a stress removing stage is executed to remove the tensile residual stress of the intermediate formed body 10. In the stress removing stage, it is desirable that the non-magnetic part 3 is expanded by force-fitting a punch 51 in the inside of the intermediate formed body 10 and, after that, the intermediate formed body 10 is ironed so that the tensile residual stress in the non-magnetic part 3 becomes a compressive residual stress with the punch 51 inserted. As the stress removing stage, a shot- peening process may be executed.
Inventors:
Tanimura Keihiro
Shimizu Maki
Hideto Kito
Satoshi Sugiyama
Sugisaka Kihisa
Yoshiyuki Katayama
Shimizu Maki
Hideto Kito
Satoshi Sugiyama
Sugisaka Kihisa
Yoshiyuki Katayama
Application Number:
JP4724797A
Publication Date:
November 28, 2007
Filing Date:
February 13, 1997
Export Citation:
Assignee:
株式会社デンソー
International Classes:
B21D22/28; C21D7/06; C21D9/00; C22C38/00; F16K31/06; H01F1/00; H01F7/16
Domestic Patent References:
| JP83643A | ||||
| JP711397A |
Attorney, Agent or Firm:
Hirohiko Usui
Takashi Ito
Takashi Ito