METHOD FOR CONTROLLING POURING OF MOLTEN METAL AND MOLD THEREFOR

摘要

PROBLEM TO BE SOLVED: To simply control the pouring quantity of molten metal at a low cost by providing a drawing plate in a molten metal pouring passage with a bottom pouring of the molten metal and reducing the cross sectional area of the pouring passage so that the opening area of the drawing plate as the time of pouring the molten metal elapses, is made larger with the effect of the poured molten metal. SOLUTION: A drawing plate 5 is provided in a molten metal pouring passage 3 at the upstream side from a sprue 6. The molten metal is poured into a mold from a sprue cup 8 in the pouring passage 3. Since the area of an opening port 7 in the drawing plate 5 is small, the molten metal is slowly filled in the pouring passage 3 at the downstream side of the throttle plate 5 and made to flow into a mold cavity 2. The opening port 7 is melted with the molten metal and gradually becomes large. The thickness of the drawing plate 5 is desirably set so that the opening port 7 equals to the area of the pouring passage 3 at the point of time when the die cavity 2 is filled by 1/3 and the disturbance is not caused on the surface layer of the molten metal. The material of the drawing plate 5 is made of the same material as the molten metal so as not to deteriorate the purity in a casting even in the case that the drawing plate 5 is melted and mixed into the casting.