METHOD OF MANUFACTURE OF WHEEL BOLTS Russian patent published in 2003 - IPC

FIELD: plastic metal working; manufacture of bolts for securing wheels. SUBSTANCE: bolt head is formed on three technological positions: on first position, head is first upset to diameter equal to minimum diameter of diameter of circumscribed circle of hexahedral head of bolt; locating cone is also preliminarily formed on this position where bolt rod is reduced. Second technological position is used for extruding cylindrical cavity at depth equal to 0.7-0.8 of height of bolt head to locating cone and diameter equal to 0.65-0.75 of size for wrench; this position is also used for finally forming locating cone. Third position is used for obtaining hexahedral head by reducing and forming cylindrical band between head and locating cone. Besides that, third position is used for forming bolt rod for thread rolling. Fourth position is used for finally forming the head, locating cone and rod for thread rolling by calibration. EFFECT: reduced usage of metal; improved quality of articles; enhanced stability of tools. 1 dwg