Spring and spring processing method

Details Spring and spring processing method Spring and spring processing method

2009-04-27

2011-12-06

Sullivan, Debra (Department: 3725)

Wireworking

Article making or forming

Spring setting

C140S07100R

Reexamination Certificate

active

08069881

ABSTRACT:
A method for residual stress enhancement for a coil spring includes radially expanding at least a select axial portion of the coil spring to remove residual tensile stress from the spring inner diameter and induce residual compressive stress in the spring inner diameter. The spring is expanded by radial force on the inner diameter and/or by a helical unwinding force induced by rotating at least one end of the spring relative to the other end of the spring. A tool includes a spring expansion portion and, optionally, a diameter control portion. Cylindrical, conical and/or beehive springs are processed to enhance residual stress.

REFERENCES:
patent: 3002865 (1961-10-01), Johnson
patent: 3751954 (1973-08-01), Ezra et al.
patent: 4836514 (1989-06-01), Ulbing
patent: 6811149 (2004-11-01), Johnson

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