| 摘要 |
PURPOSE:To improve the collapsing property of a core by mixing specific wt%, by the sand component of molding sand, quicklime or/and calcined dolomite with the molding sand. CONSTITUTION:Quicklime or/and calcined dolomite is mixed with molding sand at 1-30% by the weight of the sand component therein and a casting mold is manufactured of said sand. The mold can be easily broken when the mold is immersed in water or water is sprayed thereto after casting and therefore the mold including a core can be easily broken by immersion into water, etc. after casting according to the above-mentioned method.
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