FOUNDAMENTAL THEORY OF THE MOLDING SAND COMPOSITION FOR STEEL CASTINGS (4th Report).

Abstract

The size and shape of the silica sand grain are important for the binding strength of the molding sand, but effect of the binding medium is more important. The second and the third report of the present study dealt. with the silica sand. The present rbport described the selection of the binding medium, which should be considered in the following two points: (1) selection of clay and (2) selection of the mixing liquid. Since the mechanism of the binding phenomenou is very important for the selection of the binding medium, it was first studied and the process of the selection of the binding medium was detemined from the surface tension of the binding liquid and the flowing capability of sand.