| 摘要 |
PURPOSE:To constrain the cracking on a product by executing a slow cooling operation on each mold after casting a molten metal into forming the collapse layer capable of absorbing a product contraction force at the back of the part on which the product contraction force acts. CONSTITUTION:The dissipation layer 20 composed of an adequate dissipation material is formed on the facing sand layer 18 provided on the surface of a wax element 12 in the specified thickness. The dissipation layer 20 uses the beads 22 of a foaming styrene as the dissipation material. The cooling after casting is performed at <=200 deg.C/hour. The crack of a product is thus prevented effectively and the quality can be improved.
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