METHOD FOR FORMING PROFILE OF OPENING Russian patent published in 2004 - IPC

FIELD: plastic metal working, possibly manufacture of bore device of guns. SUBSTANCE: method comprises steps of forming outer profile of blank with lengthwise opening by mechanically removing its outer surface; before reduction placing blank in die according to conditions of orienting it along motion axis and axially stabilizing its inlet diameter at reduction; performing reduction of blank by pushing it through die with working diameter not exceeding the least diameter of outer blank and with inlet diameter corresponding to the largest diameter of blank. EFFECT: enlarged manufacturing possibilities, lowered cost. 2 cl, 4 dwg