BALL VALVE SEMI-BODY WITH FLANGE AND METHOD OF ITS PRODUCTION

摘要

FIELD: metallurgy.;SUBSTANCE: initial tubular billet is placed in first mould female die to form semi-finished product including cylindrical part, neck and adjoining flange by reverse and radial extrusion. Initial billet wall depth is selected subject to semi-finished product cylindrical part wall depth Produced semi-finished product is subjected to local heating to 1150-1100°C at cylindrical part. Them spherical part of semi-body is formed by expansion of heated part of semi-finished product at second mould at spherical male die.;EFFECT: higher strength of finished products.;5 cl, 2 dwg