Title:
圧縮コイルばねおよびその製造方法
Document Type and Number:
Japanese Patent JP5064590
Kind Code:
B1
Abstract:
By giving an appropriate compressive residual stress to a wire material, a compression coil spring having high durability can be provided even using an inexpensive wire material. The present invention provides a compression coil spring formed by using a steel wire material, the steel wire material consisting of C: 0.45 to 0.85 mass%, Si: 0.15 to 2.5 mass%, Mn: 0.3 to 1.0 mass%, Fe and inevitable impurities as a remainder, and a circle-equivalent diameter of 1.5 to 9.0 mm, wherein hardness of a freely selected cross-section of the wire material is 570 to 700 HV, and at an inner diameter side of the coil spring, unloaded compressive residual stress at a depth of 0.2 mm from a surface in an approximate maximal main stress direction in a case in which compressive load is loaded on the spring is 200 MPa or more, and unloaded compressive residual stress at a depth of 0.4 mm from surface is 100 MPa or more.
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Inventors:
Kazuya Ikai
Toru Shiraishi
Yuichiro Ono
Yoshiki Ono
Toru Shiraishi
Yuichiro Ono
Yoshiki Ono
Application Number:
JP2011175520A
Publication Date:
October 31, 2012
Filing Date:
August 11, 2011
Export Citation:
Assignee:
Nippon Jojo Co., Ltd.
International Classes:
C22C38/00; B24C1/10; C21D7/06; C21D9/02; C22C38/04; C22C38/18; F16F1/06; C22C38/54
Domestic Patent References:
| JP2011000664A | ||||
| JP2003055741A | ||||
| JP11241143A | ||||
| JP5179348A | ||||
| JP5060635U |
Attorney, Agent or Firm:
Suenari Mikio