Patent ID: 8770259
Filing Date: 2014-07-08
Classification: B22C,B22D

Abstract:
1. A method of making a cast-product, using an apparatus for cast-product production line comprising: a kneader for kneading casting sand for making a mold, the kneader including a first kneader and a second kneader; a mold maker for making a sand casting mold of said casting sand for making the mold, the sand casting mold being provided with a molding cavity for forming a singular cast product or plural cast products, a molten-metal pourer for pouring molten metal into said molding cavity of said sand casting mold; and a mold disassembler for disassembling said sand casting mold having undergone molten-metal pouring, the mold disassembler including a separator configured to take out said singular cast product or said plural cast products from said sand casting mold and separate the casting sand of said sand casting mold, the method comprising: pouring step of pouring the molten metal into said molding cavity of said sand casting mold in said molten-metal pourer, separating step of disassembling said sand casting mold having undergone molten metal pouring and taking out the singular cast product or the plural cast products from said sand casting mold and separating the casting sand of said casting mold in said mold disassembler, forming step of forming the casting sand for making the mold, said casting sand which is made into a mold by the mold maker, using said casting sand separated from said sand casting mold in said separating step, and mold making step of making the sand casting mold being provided with the molding cavity for forming the singular cast product or the plural cast products using said casting sand, wherein in said separating step, upon disassembling said sand casting mold by said mold disassembler, said sand casting mold is disassembled in such a state that at least a portion of said singular cast product or said plural cast products is supported by means of a cast-product supporter element, and upon separating the casting sand of said sand casting mold in said separator of said mold disassembler, the casting sand of said sand casting mold is separated based on casting sand having a first thermal influence resulting from the molten metal, and casting sand having a second thermal influence resulting from the molten metal, wherein the first thermal influence is larger than the second thermal influence, wherein in said forming step, said first kneader blends and then kneads an additive material for sand with the casting sand, which has been separated by said separator and which was the first thermal influence, thereby recovering said casting sand, and said second kneader blends and then kneads the casting sand, which has been kneaded and then recovered by said first kneader, with the casting sand, that has been separated by said separator and which was the second thermal influence, thereby forming the casting sand that is to be subjected to the mold making by said mold maker, wherein when a blending amount of said additive material for sand, additive material which is blended with per unit mass of said casting sand which was the first thermal influence, is taken as Wa and a blending amount of the additive material for sand, additive material which is blended with per unit mass of said casting sand which was the second thermal influence, is taken as Wb, the blending amount Wa is set greater than the blending amount Wb.