工業用純アルミニウム・パイプの引き上げ式連続鋳造における凝固プロフィルについて

抄録

  Numerical simulation was made on such casting parameters govering the solidification profiles as the level of meniscus, holding period in an intermittent casting operation, casting speed and mold diameter by the conventional forward explicit difference method considering two dimensional heat flow. If the meniscus level is low or the mold diameter is small, ring-like defects are easily formed on the internal surface of a pipe. This may be caused by prefered solidification at the meniscus where conduction heat loss to the upper solid shell or convection and radiation to the atmosphere play important roles. If the meniscus is higher than the mold height, defects are reduced but the solid shell is reheated near the melting point and then broken often. These predictions are experimentally confirmed.