METHOD FOR MANUFACTURING MOLDING SAND AND SAND CORE FOR CASTING

PROBLEM TO BE SOLVED: To obtain a cast product having a good cast surface without particularly raising the grain size index of molding sand. SOLUTION: This molding sand has the peculiarity that the molding sand having the grain size distribution setting the ratio of the molding sand in the coarse si...

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Hauptverfasser: HORI YUJI, NAKATSU KENJI
Format: Patent
Sprache:eng
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Zusammenfassung:PROBLEM TO BE SOLVED: To obtain a cast product having a good cast surface without particularly raising the grain size index of molding sand. SOLUTION: This molding sand has the peculiarity that the molding sand having the grain size distribution setting the ratio of the molding sand in the coarse side of the grain size to be larger than the ratio of the molding sand in the fine side of the grain size, in a target grain size index and also, in a prescribed grain size range containing at least this target grain size index, is obtained by mixing plural kinds of molding sands having different grain size indexed in the prescribed ratio. Further, in the above prescribed grain size range, this molding sand has the peculiarity that the grain size distribution is set so that the ratio of the molding sand is gradually reduced from the coarse side of the grain size toward the fine side of the grain size. Furthermore, this molding sand has the peculiarity that the grain size distribution is set so as to approximate the densest grain size distribution in the above target grain size index.