METHOD FOR MAKING HOLLOW AXIALLY SYMMETRICAL PARTS SUCH AS BOTTOMS Russian patent published in 2001 - IPC

FIELD: plastic metal working, namely spinning by means of rollers without thinning wall of flat or cup-shaped blank. SUBSTANCE: method comprises steps of forming central portion of spherical bottom; placing blank onto freely rotating spindle and forming curvilinear portion and cylindrical bead of bottom on non-deformed zone of blank by spinning realized at using supporting spherical roller with cone skirt; arranging rotation axis of said roller in parallel relative to rotation axis of bottom blank; realizing motion of knurling roller along arc of circle with center coinciding with that of sphere of supporting roller. Spinning may be realized at simultaneously changing height and inclination angle of spindle relative to rotation axis of supporting roller; at feeding knurling roller in radial direction relative to sphere of supporting roller. Central portion may be shaped by spinning. EFFECT: enhanced efficiency due to reduced number of equipment units and elimination of parts rejected due to corrugations. 4 cl, 8 dwg, 1 ex