汽车转向节差压铸造过程温度场精确建模和计算

为确保差压铸造汽车转向节的性能满足要求，基于实际铸造工艺对铝合金AlSi7Mg0.3的热物理性能进行精确测量和修正，建立仿真度较高的转向节差压铸造过程物理模型，计算系统不同部位的温度演化过程以及电偶测量值与实际温度间的差异。校准后的电偶实测温度曲线与计算温度曲线对比表明：计算所得的温度曲线与实测曲线形状完全一致，波峰、波谷处数值模拟的准确率达到93%以上。在此基础上进行铸件缩孔疏松预测，模拟结果与实际解剖结果一致，可进一步提高差压铸造温度场计算和测量的精确度，提高铸造缺陷预测的准确性。

Accurate modeling and computation on temperature field of counter pressure casting process of automobile steering knuckle

To ensure the performance of counter pressure casting automobile steering knuckle, the accurate measurement and correction of thermo physical property of aluminum alloy AlSi7Mg0.3 is carried out based on the actual casting process. The high similarity physical model of counter pressure casting process for steering knuckle is built. The temperature evolution in different parts of the system and the difference between the measurement temperature by electrical doublet and the actual one is calculated. The curves comparison between the calibrated measurement temperature by electrical doublet and the calculated one shows that the calculated temperature curves agree well with the measurement ones, and the accuracy of numerical simulation at peak and trough reaches over 93%. On this basis, the shrinkage porosity of castings is predicted. The simulated results are consistent with the actual anatomy results. The accuracy of calculation and measurment on temperature field is further improved, and the accuracy of casting defect prediction is improved.