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为了保证精铸件的成形精度,制造所用的模具型腔必须对铸件的收缩变形进行补偿。提出一种精铸过程位移场的数值模拟方法:通过涡轮叶片的精铸实验,测量与分析铸件上特定位置的温度值变化曲线,反向求解了界面换热系数随时间的变化关系,提高了铸件凝固过程中温度场数值计算的精度。通过设置适当的工艺参数和边界条件,基于熔模铸造温度场和应力场,对精铸过程进行耦合计算,得到了较为精确的凝固过程位移场,与实测结果吻合较好,为精铸涡轮叶片模具型腔的优化提供了量化参考依据。
In order to ensure the forming precision of the casting, the mold cavity used in manufacturing must compensate for the shrinkage of the casting. A numerical simulation method of displacement field in casting process is proposed. Through the experiment of turbine blade casting, the temperature curve at a specific location on the casting is measured and analyzed, and the relationship between the heat transfer coefficient and the heat transfer time is solved inversely, Accuracy of numerical calculation of temperature field during solidification of castings. By setting appropriate process parameters and boundary conditions, based on the temperature field and stress field of investment casting, the casting process is coupled and calculated, and the more accurate displacement field of the solidification process is obtained, which is in good agreement with the measured results. Optimization of the mold cavity provides a quantitative reference.