Measurement and Simulation of Fluidity Length in Chill-Vents Considering Metal Mold Materials

Abstract

  Squeeze die casting experiments were performed to examine fluidity of AC4CH aluminum alloy in chill-vents. The results revealed that the Be-Cu mold which has large thermal conductivity decreased fluidity by 44 % compared to the SKD61 mold. From the heat transfer point of view, this kind of difference in fluidity length can be obtained only if heat resistance between the metallic mold and molten metal tip is 1/100 or less of the conventional interfacial heat resistance. This can be explained by the fact that heat resistance is extremely low at very early stage of molten metal and metallic mold contact.