Oil tempered wire for cold forming coil springs

Details Oil tempered wire for cold forming coil springs Oil tempered wire for cold forming coil springs

2005-03-23

2008-08-05

Sheehan, John P. (Department: 1793)

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

C148S595000, C057S200000

Reexamination Certificate

active

07407555

ABSTRACT:
An oil-tempered wire for a cold-formed coil spring having a quality equivalent of or higher than a hot-formed coil spring is provided. A cold-formed coil spring made from the oil-tempered wire is also provided. Material used is the steel which contains, in weight percentage, 0.35 to 0.55% C, 1.8 to 3.0% Si, 0.5 to 1.5% Mn, 0.5 to 3.0% Ni, and 0.1 to 1.5% Cr. The ferrite fraction in the microscopic structure of this material is set to 50% or less. Hot rolled wire is cold drawn with a predetermined reduction of area, and a heat treatment using high frequency induction heating is conducted. It is preferable to set the maximum heating temperature between 900° C. to 1020° C. (favorably 950° C.) and holding time between 5 to 20 seconds. It is preferable to make the oil tempered material to have the grain size number of 9 or more, and the tensile strength from 1830 to 1980 MPa.

REFERENCES:
patent: 4407683 (1983-10-01), Hijikata et al.
patent: 4795609 (1989-01-01), Saka et al.
patent: 5009843 (1991-04-01), Sugimoto et al.
patent: 5665179 (1997-09-01), Izawa et al.
patent: 6235131 (2001-05-01), Keihle et al.
patent: 59096246 (1984-06-01), None
patent: 401184234 (1989-07-01), None
patent: 05-214484 (1993-08-01), None
patent: 09-287056 (1997-11-01), None
patent: A 11-241143 (1999-09-01), None
patent: 2000-017388 (2000-01-01), None
patent: 2000-326036 (2000-11-01), None
ASM Handbook vol. 1 pp. 131-134 (1990).

Affiliated with

Also associated with

Rating

Oil tempered wire for cold forming coil springs does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Oil tempered wire for cold forming coil springs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Oil tempered wire for cold forming coil springs will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4013602