压铸过程中压射室内金属液流动状态及其影响因素研究

Study on Flow State of Molten Metal in Injection Chamber and Its Influence Factors During Die Casting

针对铝合金压铸过程中压射室内金属液的流动状态,基于正交试验方法设计工艺方案,采用ProCAST软件进行模拟仿真计算,得到不同工艺条件下的金属液的流动状态、卷气和困气情况。模拟仿真结果表明:不同工艺参数对压射室内金属液的流动状态是不同的,冲头速度影响效果最大,随着冲头运动速度的加快,气体进入金属液的风险明显增大;压射室充满度影响次之,随着压射室充满度的增加,气体风险呈降低趋势;压射室直径、压射室长度及金属液温度的影响作用不明显。

Aiming at the flow state of molten metal in injection chamber during aluminum alloy die casting process, the flow state, gas entrainment and gas-lock in in the injection chamber were simulated with using ProCast software under different process conditions designed based on the orthogonal test. The results show that the flow state of molten metal in injection chamber is different with different process parameters, among them punch velocity has biggest impact on the flow sate. With increasing punch velocity, the risk of gas entrainment increases significantly. The gas entrainment risk decreases with filling degree of injection chamber. The effect of injection chamber diameter, length and the molten metal temperature is not obvious.