METHOD FOR MAKING THIN-WALL AXIALLY SYMMETRICAL VESSELS Russian patent published in 1999 - IPC

FIELD: plastic metal working, namely processes of forming and rotary drawing of envelope-type superthin-wall parts in the form of bodies of revolution. SUBSTANCE: method comprises steps of blanking flat sheet blanks, twisting flat sheet blank for receiving cylindrical portion of semifinished product and welding its lengthwise edges, shaping bottom portion of semifinished product, welding bottom and cylindrical portions of semifinished product, expanding lengthwise welded seam. Bottom and cylindrical portions of semifinished product are welded by annular seam. Then cylindrical portion is subjected to rotary drawing, and simultaneously annular and lengthwise seams are expanded. Length L and width M of flat sheet blank used for twisting are calculated according to predetermined relations. EFFECT: enhanced quality of products due to uniform plastic deformation of blank. 7 dwg, 1 ex