HOLLOW INGOT MANUFACTURE APPARATUS Russian patent published in 1998 - IPC

FIELD: metallurgy. SUBSTANCE: apparatus has disk-shaped mandrel with seats, where separate cores are mounted on bearings for rotation of each core about its axis of rotation. Disk-shaped mandrel is rigidly fixed with its upper part to thrust sleeve over inner surface through threaded connection. Thrust sleeve has inner threaded gear arranged in its lower part and engageable with gears fixed on separate cores. Separate cores may be fixed or disengaged from threaded gear during rolling over ingot inner cavity. EFFECT: increased efficiency, prolonged service life of separate cores and improved quality of surface of ingot opening. 2 dwg