METHOD FOR MAKING FLANGED SLEEVE Russian patent published in 2002 - IPC

FIELD: plastic metal working, namely cold forging technique, possibly making accurate axially symmetrical parts with outer and inner stepped surfaces such as flanged sleeves. SUBSTANCE: method comprises steps of cutting off round cross section blank, aligning its ends, upsetting flange, pressing out cavities on flange, marking out for punching and punching opening for threading it; at upsetting flange in second position on its end along perimeter, shaping annular cone protrusion whose inner lateral surface is inclined by angle α in range (10 - 15)degrees relative to supporting end of flange. The least inscribed diameter D1 of said protrusion is no more than 0.9 of diameter D of flange. Lateral surface of flange is cone one. In last position annular protrusion is locally upset and supporting end of sleeve flange is calked. EFFECT: enhanced accuracy of forged parts, simplified design of fittings and forging tool, lowered labor consumption for making parts. 2 cl