FIELD: process engineering.
SUBSTANCE: invention relates to machine building and may be used for producing springs by hot winding. Proposed method consists in using mandrel with outer surface layer made of metal that features lower heat conductance. This allows making the spring coil in tempering with metal martensite structure owing to eliminated heat removal from spring coil inner surface in contact with mandrel outer surface layer.
EFFECT: higher quality of springs.
2 cl, 2 dwg
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