根据熔模精密铸造过程的传热特点 ,通过对铸型 /环境边界及冒口/环境边界进行自然对流和辐射传热处理 ,改进了原有数值模拟系统 ,实现了对熔模铸造凝固过程温度场的数值模拟 .对采用 4种不同铸造工艺方案的阀体铸件凝固过程进行了数值模拟及缺陷预测 ,获得了与试验相一致的模拟结果 .根据数值模拟结果 ,确定了进行批生产的铸造工艺方案 . According to the heat transfer characteristics of investment casting process, the original numerical simulation system was improved by natural convection and radiative heat transfer on the mold / environment boundary and riser / environment boundary, and the temperature of the solidification process of investment casting Field numerical simulation.The numerical simulation and defect prediction of the solidification process of valve castings with 4 different casting schemes were carried out and the simulation results consistent with the experiments were obtained.According to the numerical simulation results, Program .