METHOD OF MAKING HIGH-LOADED COMPRESSION SPRINGS Russian patent published in 2012 - IPC B21F35/00 C21D9/02 

FIELD: process engineering.

SUBSTANCE: invention relates to machine building and may be used for producing compression springs. Proposed method comprises spring winding with pitch exceeding that of finished spring, stress relief, luminous capillary control, face grinding, shotcasting cold working and chamfering of coil ends. After shotcasting cold-working, spring plastic hardening is performed at 200…250°C by axial stress of (10…300)F₃, where F₃ is spring force at maximum strain.

EFFECT: higher operating properties.

2 cl