WASTE MOLTEN METAL TYPE FULL MOLD CASTING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a full mold casting method, with which thermal-decomposed product contained in molten metal in a mold is discharged to the outer part and carbon defect is not generated. ;SOLUTION: The mold 2 is constituted with a molding flask 4, molding sand 6 in the molding flask 4, a pattern 8 embedded in the molding sand 6, etc. The pattern 8 is made of combustible resin material of foamable polystyrene, etc., and formed as the same shape as the finish product of the casting. A sprue 12 and a runner 14, and an upper flowing gate 16 connected with the runner 14 and a lower flowing gate 17 and a flowing outlet 18 connected with a molten metal pool part 20, etc., are connected with the pattern 8. The upper flowing gate 16 is formed on the upper side surface of the pattern 8 and the flowing outlet 18 is formed so as to be faced to the upper flowing gate 16, and these holes are opened at the lower side from the upper surface of the pattern 8 by 2-3 cm. In this way, when the molten metal is poured from the sprue 12, the decomposed material floated up on the upper layer of the molten metal is discharged to molten metal pool part 20 through the flowing outlet 18 to prevent the generation of the carbon defect caused by the decomposed material in the finish product.;COPYRIGHT: (C)2000,JPO