FIELD: process engineering.
SUBSTANCE: invention relates to metal forming, particularly to production of axially symmetric parts from especially-thin-wall tube stock. Crimps are formed by resilient medium in rigid female dies on expansion by resilient medium internal pressure at axial displacement of tube biller free end. Note here that tube stock material is selected proceeding from amount of elongation after fracture δ defined from relationship given in the claim.
EFFECT: higher quality of bellows.
1 dwg
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