PURPOSE: To produce a product without any casting defect of casting blow hole, etc., by setting the sand core into a metallic mold under condition of lowering the sand core temp. to less than the room temp. and pouring molten metal to make difficult to generate gas or moisture from the sand core caused by heat of the molten metal.
CONSTITUTION: The sand cores 2 are put on each step in multi-steps in a cooling device 1 and further an air conditioner 3 is connected with the cooling device 1 and also thermometer 4 and hydroscope 5 are fitted to the device 1. Next, at the time of executing casting, cooling blast from the air conditioner 3 is introduced into the cooling device 1, and the moisture in the sand cores 2 in the cooling device 1 is removed by blasting for about 30 min, to cool the sand core 2 to about 13°C, and successively after setting the cooled sand core 2 into the metallic mold 6, the molten metal is poured in the metallic mold 6. After casting, the casting is taken out from the metallic mold 6 and the sand on the casting is removed by collapsing the sand core 2, to obtain the product having the aimed shape.
SUZUKI MITSUO
FUKAZAWA TAKASHI
ENSHU KEIGOKIN KK