METHOD TO STRENGTHEN CYLINDRICAL HELICAL SPRINGS Russian patent published in 2012 - IPC C21D9/02 C21D7/06 B21F35/00

Abstract RU 2462519 C1

FIELD: machine building.

SUBSTANCE: method to strengthen cylindrical helical springs includes operations of winding, hardening and tempering, grit blasting and pre-stressing. At the final stage the internal surface of springs is cold worked. Cold working is done by means of core pulling or by impact action at the internal surface of the spring turn.

EFFECT: targeted action at an inner surface of spring turns by means of plastic deformation.

3 cl, 2 dwg

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RU 2 462 519 C1

Authors

Shavrin Oleg Ivanovich

Dates

2012-09-27—Published

2011-04-20—Filed