Process for producing a coil spring

Details Process for producing a coil spring Process for producing a coil spring

1995-07-27

1997-09-09

Yee, Deborah

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

148230, 148580, 148908, C21D 902, C21D 106, C23C 826, C22C 3802

Patent

active

056651791

ABSTRACT:
A process for producing a coil spring comprises steps of: cold drawing a wire comprising: C in an amount of 0.55 to 0.75% by weight; Si in an amount of 1.00 to 2.50% by weight; at least two primary metals selected from the primary metal group consisting of: Mn in an amount of 0.30 to 1.5% by weight; Ni in an amount of 1.00 to 4.00% by weight; Cr in an amount of 0.50 to 2.50% by weight; Mo in an amount of 0.10 to 1.00% by weight; at least one secondary metal selected from the secondary metal group consisting of: V in an amount of 0.05 to 0.60% by weight; Nb in an amount of 0.05 to 0.60% by weight; and the balance of substantially Fe; oil quenching and tempering the wire; hot tempering the wire, thereby preparing the tempered wire whose tensile strength .sigma.b falls in the range of from 1370 to 1670 N/mm.sup.2 ; cold coiling; hardening and tempering; grinding; gas nitriding; high strength two-stage shot peening; and low temperature annealing the tempered wire. Accordingly the present process can product the coil spring whose endurance limit .tau.m is 687.+-.560 MPa and which has high strength and high fatigue resistance without breakage.

REFERENCES:
patent: 3073022 (1963-01-01), Bush et al.
English-language abstract of Japanese Patent No. JP-A-02-107746, from Patent Abstracts of Japan, vol. 14, No. 314 (Jul. 1990).
English-language abstract of Japanese Patent No. JP-A-05-177544, from Patent Abstracts of Japan, vol. 17, No. 595 (Oct. 1993).
English-language abstract of Japanese Patent No. JP-A-05-148537, from Patent Abstracts of Japan, vol. 17, No. 540 (Sep. 1993).
English-language abstract of Japanese Patent No. JP-A-04-285142, from Patent Abstracts of Japan, vol. 17, No. 93 (Feb. 1993).
English-language abstract of Japanese Patent No. JP-A-63-176430, from Patent Abstracts of Japan, vol. 12, No. 450 (Nov. 1988).

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