METHOD OF MAKING ANNULAR FORGINGS Russian patent published in 1997 - IPC

FIELD: plastic metal working. SUBSTANCE: method of making annular forgings after upsetting blank comprises steps of making semifinished product with inner cavity at preliminary deformation stage. Configuration of said cavity corresponds to inner cavity of ready forging. Diameter of lower flange of semifinished product consists 0.96-1.0 of diameter of lower end of ready forging, its volume consists 1.04-1.16 of ready forging volume. At final deformation stage upper flange and annular recess arranged between said flange and disc part of forging are formed simultaneously. EFFECT: enhanced efficiency. 3 dwg, 1 tbl