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Title:
SPRING AND MANUFACTURE METHOD THEREOF
Document Type and Number:
Japanese Patent JP2012111992
Kind Code:
A
Abstract:

To provide a spring that has excellent fatigue resistance, reduces material costs and simplifies manufacturing processes.

A method for manufacturing the spring includes: a shaping step of shaping a wire rod having components consisting of, by mass, 0.5-0.7% of C, 1.0-2.0% of Si, 0.1-1.0% of Mn, 0.1-1.0% of Cr, 0.035% or less of P,0.035% or less of S, and the balance Fe and inevitable impurities, into a spring shape; a thermal treatment step of austenizing the spring at the temperature of Ac3 point or more (Ac3 point+250°C), and then cooling the spring at the rate of 20°C/sec or more, holding the spring for 400 sec or more at the temperature of (Ms point-20°C) to (Ms point+60°C), and cooling the spring to a room temperature; and a shot peening step of projecting a shot at the heat treated spring.


Inventors:
SUZUKI TAKESHI
ONO YOSHIKI
KUROKAWA SHINPEI
SHIBAIRI KOSUKE
Application Number:
JP2010260615A
Publication Date:
June 14, 2012
Filing Date:
November 22, 2010
Export Citation:
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Assignee:
NHK SPRING CO LTD
International Classes:
C22C38/00; C21D7/06; C21D9/02; C22C38/34; F16F1/02
Domestic Patent References:
JPH02129422A1990-05-17
JPH1180895A1999-03-26
JP2007154240A2007-06-21
JP2006291291A2006-10-26
JP2001220650A2001-08-14
JPS63312917A1988-12-21
JPH02129422A1990-05-17
JPH1180895A1999-03-26
JP2007154240A2007-06-21
JP2006291291A2006-10-26
JP2001220650A2001-08-14
JPS63312917A1988-12-21
Foreign References:
WO2010110041A12010-09-30
WO2010110041A12010-09-30
Attorney, Agent or Firm:
Suenari Mikio



 
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