BALL PRODUCTION METHOD Russian patent published in 2001 - IPC

FIELD: metallurgy. SUBSTANCE: method comprises steps of cutting round elongated rod blank by measured lengths; transmitting cut-measured blanks to die set and forming ball. Before cutting, round rod blank is reduced in direction normal relative to its lengthwise axis for making two planes. Then flat bank is subjected to periodical pinching in direction parallel relative to said planes and normal relative to lengthwise axis for forming convex surface portions and it is cut by measured blanks along surfaces in pinched zones in direction normal relative to planes and lengthwise axis in order to receive measured blanks elongated in direction parallel to said planes and normal relative to lengthwise axis. At further forming operation size of blank is lowered in said direction. Parallel planes are made on rod blank by lengthwise rolling, upsetting or broaching. EFFECT: enhanced accuracy of dimensions of products. 3 cl, 5 dwg