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根据挤压铸造凝固过程的基本物理规律和特点,提出了一种基于ANSYS的挤压铸造凝固过程热-力耦合模拟方法。模拟中考虑了热收缩和相变收缩,材料凝固和受力状态下的力学行为、潜热释放规律,以及界面传热与变形之间的相互作用。通过对阶梯试样的模拟,展示了模拟方法的有效性,模拟结果在一定程度上描述了铸件凝固过程的温度变化,同时较好地显示了挤压铸造凝固过程中挤压力的传递和衰减。最后,利用此模拟方法对汽车副车架的挤压铸造凝固过程进行计算,并根据模拟结果对工艺方案进行了优化。
According to the basic physical laws and characteristics of the solidification process of squeeze casting, a simulation method of thermo-mechanical coupling in the solidification process of squeeze casting is proposed based on ANSYS. The simulation considers the thermal contraction and phase transformation shrinkage, the mechanical behavior of the material in the solidified and stressed state, the law of latent heat release, and the interaction between heat transfer and deformation of the interface. Through the simulation of the ladder sample, the effectiveness of the simulation method is demonstrated. The simulation results described to some extent the temperature change during the solidification of the casting, and at the same time shows the transmission and attenuation of the extrusion pressure during the solidification of the squeeze casting . Finally, this simulation method is used to calculate the squeeze casting solidification process of the automobile sub-frame, and the process scheme is optimized according to the simulation results.