FIELD: technological processes; metallurgy.
SUBSTANCE: thin-walled tubular billet is manufactured with internal diameter close to internal diameter of bellows cylindrical part. Then several operations of rotational extrusion and thermal treatment are alternated for removal of internal strain with further installation of tubular billet in device for shaping of corrugation. Single-corrugation bellows is shaped from tubular billet on the mandrel with annular groove by means of creation of external pressure in the corrugation area with ends of tubular billet previously pressed to mandrel with the possibility of their sliding between mandrel and clamp.
EFFECT: quality of bellows is increased.
3 cl, 3 dwg, 1 ex
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