FIELD: process engineering.
SUBSTANCE: invention relates to production of rings. Initial material is cut into preset-length sections. Then, cutout is made in initial material over its length to produce a blank. Said blank is fitted in the tool. Then, cutout is expanded by forcing male die into blank and applying contracting force to blank ends. Said cutout is expanded unless round blank is obtained.
EFFECT: higher quality.
5 cl, 9 dwg
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