METHOD OF BARREL PRODUCTION Russian patent published in 2015 - IPC B21K21/06 

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming and may be used for production of rifled and smooth barrels. Pipe billet with lead-in part is produced as a temporary outer chamfer. Chamfer generatrix is arranged at the angle α<90° to lengthwise plane. Said chamfer has the base changing to auxiliary surface with peripheral diameter D₀. Auxiliary surface generatrix is inclined to lengthwise plane at the angle equal to that of temporary chamfer inclination. Pipe billet is subjected to first radial reduction to get intermediate barrel forged piece. After intermediate thermal and mechanical treatment, second reduction is made. Intermediate forged piece for second radial reduction is made with auxiliary surface generatrix inclined to lengthwise plane at the angle of zero degrees and peripheral diameter D₀′′ < D₀.

EFFECT: lower labour input, higher reliability of clamping.

3 dwg, 1 ex