Method of making a composite sand mold including recycling the land

Abstract

Abstract A precision-type composite mold or core for foundry use comprising a body formed from relatively inexpensive coarse sand bonded with sodium silicate cured by reaction with CO2 and a relatively expensive facing integral with said body and composed of a lesser amount of relatively fine sand than the coarse sand of said body, said fine sand being bonded by a synthetic resin cured by reaction with an amine, at least said coarse sand and sodium silicate bond being recoverable following the use of the mold or core formed therefrom and reconstituted for further use to decrease the overall cost of making and using molds and cores of such type.

Inventors

• 👤 Lothar Robert Zifferer

Bibliographic Details