METHOD FOR PRODUCTION OF HIGH-LOADED COMPRESSION SPRINGS Russian patent published in 2009 - IPC B21F35/00 

FIELD: technological processes.

SUBSTANCE: method includes coiling of spring from polished or strengthened wire with pitch that exceeds pitch of finished spring, thermal treatment, shotcasting riveting, thermosetting or hardening. Afterwards or simultaneously with thermosetting, spring plastic strengthening is carried out by its compression by axial load, which makes (10÷300)F₃, where F₃ is spring force at its maximum deformation. Prior to spring coiling, high-temperature or low-temperature thermomechanical strengthening of wire is carried out, and spring compression by axial load is done in process of its heating up to tempering or quenching temperature.

EFFECT: improved operational properties of spring.

4 cl