METHOD OF CONICAL PIECES PRODUCTION Russian patent published in 1996 - IPC

FIELD: production of thin-walled conical pieces of average taper with small radius at vertex. SUBSTANCE: method provides for production of blank with hemisphere and cylindrical small belt and following reduction. Blank is stamped with bottom bending by radius, value of which exceeds value of good piece bending radius. Reduction is exercised in two stages: at first stage clearance between punch of support and bottom is taken up and at second stage reduction together with drawing is realized. The combination of features provides increase of productivity due to decrease of number of operations and transitions required for piece production. EFFECT: increased productivity. 3 cl, 3 dwg