Title:
HIGH-STRENGTH SPRING AND PRODUCTION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2000/075381
Kind Code:
A1
Abstract:
Spring steel having a hardness expressed by a Brinell ball indentation diameter of at least 2.7 mm is kept insulated at 150 to 350°C, and is subjected to warm stress peening with a stress given to the spring steel at the above temperature.
Inventors:
TANGE AKIRA (JP)
ANDO KOTOJI (JP)
WATANABE KOJI (JP)
ANDO KOTOJI (JP)
WATANABE KOJI (JP)
Application Number:
PCT/JP2000/003730
Publication Date:
December 14, 2000
Filing Date:
June 08, 2000
Export Citation:
Assignee:
NHK SPRING CO LTD (JP)
TANGE AKIRA (JP)
ANDO KOTOJI (JP)
WATANABE KOJI (JP)
TANGE AKIRA (JP)
ANDO KOTOJI (JP)
WATANABE KOJI (JP)
International Classes:
C21D7/06; C21D9/02; F16F1/02; (IPC1-7): C21D7/06
Foreign References:
| US6022427A | 2000-02-08 | |||
| US5816088A | 1998-10-06 | |||
| JPH05177544A | 1993-07-20 | |||
| JPH0531671A | 1993-02-09 | |||
| EP0694621A1 | 1996-01-31 | |||
| JPH05179349A | 1993-07-20 | |||
| US5258082A | 1993-11-02 | |||
| JPH05148537A | 1993-06-15 |
Other References:
See also references of EP 1201773A4
Attorney, Agent or Firm:
Suenari, Mikio (Kyobashi 2-chome Chuo-ku Tokyo, JP)
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