鋳鉄の凝固殻（かく）の強さと移動量について

抄録

  It has been known that solid skin moves toward a mold or a metal when cast iron is solidified in the sand mold. Movement of the solid skin is affected by its own strength. However, the strength of the solid skin has not been known. In this study, the strength of the solid skin and its movement during freezing in the mold were measured when molten cast iron was poured into an N-process mold.
  The strength of the solid skin is low immediately after pouring, but increases rapidly after a certain period of time. The strength of the solid skin immediately after pouring was decreasing in the order of magnesium treated spheroidal graphite iron, calcium treated spheroidal graphite iron, inoculated gray iron and non-inoculated gray iron. Carbon content has little effect on the strength of the solid skin. The solid skin moved toward the metal immediately after pouring, but it moved toward the mold after a certain period of time. The length of mevement toward the mold increased as the strength of the solid skin decreased.