消失模型鋳造法における各種充てん物の冷却性能

抄録

  The bulk densities, void ratios and effective thermal conductivities of packed beds composed of steel shot and zircon sand and those of steel shots with two different sizes were measured. The plate casting of aluminum alloy was casted by using these mixtures as a mold in evaporative pattern casting process. The bulk density and effective thermal conductivity of the packed bed composed of a mixture of steel shot 0.5mm in diameter and zircon sand took maximum when the weight fraction of the steel shot was about 0.7, and those for a mixture with steel shots of two different sizes 2.5mm and 0.17mm diameter took maximum when the weight fraction of coarse steel shot was about 0.8. When these mixtures were used, the solidification time of cast were reduced to about 1/3 and 1/4 of that when the mold was made of silica sand.