Influence of Low Thermal Expansion Ratio of Artificial Sand Mold on Open Shrinkage of DCI.

Abstract

  The shrinkage formation of Ductile Cast Iron (DCI) is studied by using computer simulations in consideration of various functions during the solidification process.
  Influence of thermal expansion ratio of the molding sand on appearance of open shrinkage during solidification of DCI (in riserless design) is studied by using artificial, and natural sand.
  The test result shows that lower expansion ratio of sand increase the volume of open shrinkage. Mixed use of silica sand and artificial sand which has low expansion ratio is proposed to reduce the volume of open shrinkage.