METHOD FOR MANUFACTURE OF HOLLOW FORGED PIECE WITH OFFSET Russian patent published in 2009 - IPC B21K21/02 B21J5/02 

FIELD: technological processes.

SUBSTANCE: upset is done in initial stock end to mold stock with convex ends. Then upset stock is turned, laid flatwise, and semi-finished product is molded with cavity and link. Molding is done preferably in one half of die by expansion and metal extrusion upwards and to offset side that is unsymmetrical relative to vertical axis of semi-finished product cavity. At that upper end surfaces of semi-finished product are left free from contact with tool. Then final stamping of semi-finished product is done in open die with displacement of external burr, removal of link and burr.

EFFECT: higher efficiency.

11 cl, 2 dwg, 1 ex