Sand mold for casting

Abstract

Abstract PURPOSE:To provide the reduction of curing time, the reduction of mold cost, etc. by mixing calcium sulfate, calcium silicate, etc. with sand contg. water then spraying an aq. silicate soln. thereto to bind and cure the surface of the sand mold. CONSTITUTION:The binder materials of >= kinds selected from the group of the calcium silicate, magnesium carbonate, calcium sulfate, etc. are thoroughly mixed with the sand contg. a proper amt. of water. The treated sand is molded to a desired shape and the aq. silicate soln. is sprayed onto the surface of the sand mold. The silicate such as sodium silicate penetrates into the sand and reacts with the binder material such as calcium sulfate and water to cure the sand mold. The curing rate is controllable by the concn. of the aq. silicate soln. The curing time is thus reduced by the above-mentioned method and the generation of a harmful gas is prevented. The cost of the sand mold is further reduced.

Inventors

• 👤 Yoshio Ushiku
• 👤 牛久　芳雄

Bibliographic Details