FIELD: process engineering.
SUBSTANCE: invention relates to machine building and may be used for helical spring hardening. This process comprises spring winding, heat treatment, sand blasting, spring hardening by aging in compressed condition or its 3-5-fold contraction till contact between turns and cold-hardening. Spring winding is executed with pitch larger than that of finished spring, luminescence control is performed and heat-treated spring ends are finished. Cold-hardening is executed at final stage by stamping of the spring inner and outer surface by pushing contracted spring tightly fitted on male die through female die hole with diameter smaller than that of spring on male die.
EFFECT: stable resilience, higher efficiency of hardening.
2 cl, 1 dwg
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