| 摘要 |
PROBLEM TO BE SOLVED: To prevent casting defect caused by thermal decomposition of a pattern, in a simple process. SOLUTION: In a lost foam pattern casting method by embedding the pattern made of synthetic resin foaming body into molding sand and executing the casting, a gap is generated between the pattern and a mold and the pattern is not taken out, and the casting is executed. Desirably, the generation of the gap is executed by adding and mixing solvent having A±1.5 solubility parameter (wherein, A is the solubility parameter of the synthetic resin foaming body) into the molding sand.
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