METHOD FOR MAKING HIGHLY LOADED COMPRESSION SPRINGS Russian patent published in 2006 - IPC B21F35/00 C21D9/02 

FIELD: manufacture of helical compression springs operating at impingement of their turns in condition of elevated temperatures.

SUBSTANCE: after coiling spring with pitch more than that of ready spring, the last is subjected to heat treatment and shot-blast hardening. After thermal compression and scragging spring or simultaneously with said operations, turns of spring are subjected to plastic strengthening. In order to realize it, spring is compressed by action of load consisting of 10 - 300 F₃ where F₃ - spring force at maximum deformation.

EFFECT: possibility for making springs with improved dynamic strength and with accurate stable in time elastic characteristics.

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