建立了模拟挤压铸造凝固过程中收缩缺陷形成的有限差分/有限元计算模型,该模型包括了凝固过程中的潜热释放和体积收缩效应。在温度场模拟中采用了交替隐式算法,在应力场模拟中采用了热粘弹塑性本构模型。为验证模型的正确性,对A356铝合金挤压铸造凝固过程进行了模拟计算,模拟结果与实验结果一致。 A finite difference / finite element model was established to simulate the formation of shrinkage defects during the solidification process of squeeze casting. The model includes the latent heat release and volume shrinkage effect in the solidification process. In the simulation of temperature field, an alternating implicit algorithm is adopted and a thermo viscoelasto-plastic constitutive model is adopted in the stress field simulation. In order to verify the correctness of the model, the solidification process of A356 aluminum alloy extrusion die casting was simulated. The simulation results are consistent with the experimental results.