PREVENTING METHOD FOR EXPLOSION OF WATER DROP UNDER MOLD WEIGHT

摘要

PURPOSE:To prevent the damaging of a mold and a core and to eliminate the cause for defective castings by coating oil on the bottom surface of a weight placed on the mold thereby reducing the evaporating and explosive force of the water drops stuck on the bottom surface of the weight. CONSTITUTION:During transporting of a weight 1, the oil 3 in a pressure vessel 4 is coated on the bottom surface of the weight 1 by operating an oil coating gun 6. The oil supply part of the gun 6 communicates with the inside of the oil 3 in the vessel 4 through a pipe 7 and the injection pressure supply part of the gun 6 communicates with a compressed air source through a piping 8. Since the oil 3 is coated on the bottom surface of the weight 1 placed on the mold during charging of molten metal to the mold in this way, the evaporating and explosive force of the water drops stuck on the bottom surface of the weight is reduced.