抄録
The studies made by the authors are concerning the compression strength measurement of green sand molds. The strength of green sand molds shall be influenced, in general, by the surface tension and the viscosity of the binder mixed into sands when the same grain sized sands are used. Consequently it can be thought that the strength of green sand molds shall be changed corresponding to the variation of the compression velocity. At the time of measuring the compression strength of green and molds, the authors conducted the measurement with separating the two factors such as the surface tension and the viscosity of the binders while changing the compression velocity. It has ascertained through the experiment made by the authors that it is the surface tension of binder that effects the influence on the strength of green sand molds and the sorts of binders have nothing o do with the strength when the compression velocity is less than 0.04mm/sec. and the grain size of the silica sands is approximately 100 mesh.
