METHOD FOR ROLLING BLANKS IN COGGING MILLS Russian patent published in 1999 - IPC

FIELD: method for rolling in cogging mills. SUBSTANCE: method comprises steps of deforming billet between rolling rolls of two-high reversing cogging mill in two mutually normal planes on flat roll barrels in box grooved passes; at least at two passes deforming leading end portion of billet at percentage reduction at least twice exceeding percentage reduction value of rear end portion of billet and providing ratio of rolling speed of end portion rolled with larger reduction value to rolling speed of end portion rolled with smaller reduction value no more than 0.9. EFFECT: lowered crop value and therefore less loss of yield. 1 tbl, 1 ex