中文摘要：

采用铝合金ADCl2以及镁合金AM50为铸件材料，并采用“阶梯”铸件进行了压铸实验．以压铸过程实际测得的温度作为输入参数，利用自行编制的热传导反算程序计算了压铸过程铸件／铸型间的换热系数．结果表明：不同合金材料对界面换热系数的影响主要表现在换热系数的数值以及保持较高数值所持续的时间上，而对换热系数曲线的形状影响不大；随着高速速度的增大，较薄“阶梯”与铸型之间的换热系数增大；对于较厚“阶梯”，随着铸型初始温度的上升，换热系数不断减小．随着铸造压力的增大，最厚“阶梯”与铸型之间换热系数逐渐增大，但铸造压力只在镁合金AM50实验条件下表现出了明显的影响规律．

英文摘要：

High pressure die casting experiments were carried out using a “ step shape ” casting and two commercial alloys, the ADC12 aluminum alloy and the AM50 magnesium alloy. The metal/die interracial heat transfer coefficient （IHTC） was determined using an home-developed inverse thermal program by applying the measured temperature as the input parameter. The results show that alloys mainly influence the value of the IHTC and the duration maintaining for a higher IHTC value, but have little effect on the shape of the IHTC profile; The IHTC of the thinner steps increases as the fast shot velocity increases; The IHTC of the thicker steps decreases as the initial die temperature increases; When the cast alloy is AM50, a higher casting pressure leads to a higher peak value of the IHTC at the thickest step.