METHOD OF CRIMPING MOUTH OF BOTTLE Russian patent published in 1995 - IPC

FIELD: metal pressure forming. SUBSTANCE: method comprises steps of forming transitional and cylindrical portions of a mouth on a heated end of a rotating blank with use of supporting and shaping rollers; performing formation of the transitional and cylindrical portions of the mouth stage-by-stage; at first stage by linear motion of the supporting a cone portion; at second stage forming the translational and the cylindrical portions of the mouth by several passes (no less, than two) to a final profile by successive axial and curvilinear motions of the shaping roller; performing operations of the second stage with reduction degree no less, than (0.5-0.6) of a radius of the shaping roller over each pass of that roller. EFFECT: enhanced quality of crimped mouth of bottle. 2 cl, 5 dwg