Casting mold and method for manufacturing the same
AssigneesTsuchiyoshi Industry Co., Ltd., Mazda Motor Corporation
InventorsYutaka Kurokawa, Hideo Une, Yuji Hori, Shoichi Nishi, Hiroaki Kusunoki, Naohiro Miura
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Abstract
A casting mold which is molded by heating mulled sand including a mixture of refractory molding sand particles, an inorganic water soluble binder and water, wherein the inorganic water soluble binder is made of a combination of a sulfate compound such as magnesium sulfate heptahydrate and a borate compound such as sodium tetraborate decahydrate. The casting mold is formed by baking the mulled sand in such a manner that at least part of the sulfate compound retains water of crystallization therein and the borate compound is once fused and then cured.
Claims7
A casting mold which is molded by heating mulled sand including a mixture of refractory molding sand particles, an inorganic water soluble binder and water, wherein
- the inorganic water soluble binder contains a sulfate compound and a borate compound, at least part of the sulfate compound retains water of crystallization therein after the heating and the borate compound is once fused by the heating and then cured.
A method for manufacturing a casting mold using mulled sand including a mixture of an inorganic water soluble binder containing a sulfate compound and a borate compound, water and refractory molding sand particles, the method comprising the steps of:
- filling a forming die with the mulled sand;
- and
- heating the mulled sand in the forming die in such a manner that at least part of the sulfate compound retains water of crystallization therein and the borate compound is fused.
Dependencies are inferred from the claim text.