METHOD OF SPRINGS RECOVERY Russian patent published in 2011 - IPC C21D9/02 C21D1/78 B23P6/00 

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming, particularly, to recovery of elastic properties of springs. To increase performances of the spring to be recovers, it is hated and tempered, and expanded with pitch exceeding that of normal spring. Then, it is heat treated, shotblasted and pressed by axial lad of (10…300)F₃, where F₃ is spring force at minimum strain. Now, it is re-pressed at load proportional to relation between required compression and that resulted from application of the first load. Used loads may be caused by vibration. Preset spring height reached, no re-pressing can be performed. Given increased requirements to force parametres, spring can be straightened.

EFFECT: spring recovery method.

4 cl