UPSETTING DIE SET Russian patent published in 1998 - IPC

FIELD: plastic metal working, namely die set for upsetting blanks. SUBSTANCE: die set includes punch with knocking out member mounted in upper casing, self-aligning die with working cavity, elastic members, lower punch mounted in lower casing. Generatrix of working cavity of die has alternating vertical and mean inclined portions. Height of vertical portions is no more than stroke of knocking out member of die set. Cross dimensions of vertical portion of working cavity adjoining to end of self-aligning die are equal to respective dimensions of shaping member of lower part of die set for next-stage forming designed for basing upset blank in further die set. Working surface of lower punch is provided with annular protrusion with cross section in the form of segment whose inner diameter is equal to that of upset blank. EFFECT: enhanced design of die set providing metal economy. 3 cl, 4 dwg