Evaluation of heat-transfer coefficients at the casting/die interface in squeeze casting

Abstract

The solidification of an aluminum alloy under high pressure has been investigated. The interfacial heat- transfer coefficient between the casting and the mould varies with time after pouring the molten metal into a mould cavity and therefore plays an important role in determining solidification sequences. The interfacial heat transfer coefficient was evaluated using an inverse problem method, based on measured temperature distributions. The effects of applied pressure and mould insulation on interfacial heat-transfer coefficients were investigated. The calculated heat-transfer coefficients were used for solidification simulation in the squeeze casting process. The predicted cooling curves based on the calculated heat-transfer coefficients were in good agreement with those determined experimentally.