Title:
COMPRESSION COIL SPRING AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2013/021828
Kind Code:
A1
Abstract:
Provided are a highly durable compression coil spring, which is produced using an inexpensive wire rod while imparting an adequate residual stress to the wire rod, and a method for producing the compression coil spring. The compression coil spring is made of a steel wire rod that contains, by weight, 0.45-0.85% C, 15-2.5% Si, and 0.3-1.0% Mn, and the balance iron and unavoidable impurities, said steel wire rod having an equivalent circle diameter of 1.5-9.0mm. The compression coil spring has a hardness of 570-700HV in any cross-section of the wire rod, an unloaded compressive residual stress equal to or greater than 200MPa on the inner side of the coil spring at a depth of 0.2mm from the surface in substantially the direction of the maximum principal stress when a compressive load is applied to the spring, and an unloaded compressive residual stress equal to or greater than 100MPa at a depth of 0.4mm from the surface.
Inventors:
IKAI KAZUYA (JP)
SHIRAISHI TOHRU (JP)
ONO YUICHIRO (JP)
ONO YOSHIKI (JP)
SHIRAISHI TOHRU (JP)
ONO YUICHIRO (JP)
ONO YOSHIKI (JP)
Application Number:
PCT/JP2012/068965
Publication Date:
February 14, 2013
Filing Date:
July 26, 2012
Export Citation:
Assignee:
NHK SPRING CO LTD (JP)
IKAI KAZUYA (JP)
SHIRAISHI TOHRU (JP)
ONO YUICHIRO (JP)
ONO YOSHIKI (JP)
IKAI KAZUYA (JP)
SHIRAISHI TOHRU (JP)
ONO YUICHIRO (JP)
ONO YOSHIKI (JP)
International Classes:
C22C38/04; B24C1/10; C21D7/06; C21D9/02; C22C38/54; F16F1/06
Domestic Patent References:
WO2010134657A1 | 2010-11-25 |
Foreign References:
JP2011000664A | 2011-01-06 | |||
JP2003055741A | 2003-02-26 | |||
JPH11241143A | 1999-09-07 | |||
JP2006522214A | 2006-09-28 | |||
JPH05179348A | 1993-07-20 | |||
JPS6127133A | 1986-02-06 |
Other References:
See also references of EP 2743366A4
Attorney, Agent or Firm:
SUENARI, Mikio (JP)
End 成 Mikio (JP)
End 成 Mikio (JP)
Download PDF:
Claims:
Previous Patent: TERMINAL DEVICE, BASE STATION DEVICE, PROGRAM, AND INTEGRATED CIRCUIT
Next Patent: MOBILE BODY
Next Patent: MOBILE BODY