FIELD: manufacture of cans by circular bending. SUBSTANCE: apparatus includes two shaping punches with shaping cavities for bending sheet blank around core. Circumferential length of both cavities is more than length of half-circle of cans. At preliminary deformation core is inserted into first cavity deeper than it is necessary for can radius. Sheet blank is deformed to U-shaped blank. At intermediate deformation process additional core is fit main core. In the result during forwards stroke of second shaping punch only ends of branched portions of U-shaped blank are deformed to circle arc. After removal of additional core and part of first shaping punch, end portions of can are deformed in such a way that shaping punch moves behind middle of can. EFFECT: enhanced accuracy of bending due to realization of three stage bending process. 14 cl, 12 dwg
