FIELD: metallurgy.
SUBSTANCE: by means of rotary extrusion of rotary blank by rolling rollers there are received maximum possible thickenings or thinning by wall thickness of envelopes. Additionally clearance between rollers and holder-up are corrected for value, specified by presented correlation formula from calculation of permissible errors.
EFFECT: it is improved quality with required by minor diametre thickening.
1 dwg, 1 ex
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