通过ProCAST软件对一种GIS用壳体的原铸造工艺进行充型与凝固仿真分析,研究了该零件出现的铸造缺陷的原因,并进行了工艺优化。结果表明,大法兰面采用厚25mm的随型冷铁,其工艺的凝固过程出现孤立液相区,导致铸件的缩孔缺陷;优化工艺后,大法兰面采用厚15mm的冷铁,让开内浇道位置且冷铁内圆周与筒壁保持10mm的距离,其凝固过程为顺序凝固,使缩孔消除。对模拟结果进行了生产验证,模拟结果符合生产实际。 ProCAST software was used to simulate the filling and solidification process of a kind of original casting process of GIS shell. The reason of the casting defects appeared in the part and the process optimization were studied. The results show that the large flange surface with the type of cold iron with a thickness of 25mm, the process of the solidification process appears isolated liquid region, resulting in shrinkage defects casting; optimization process, the large flange surface using 15mm thick cold iron, The position of the runner and the inner circumference of the chill iron keep the distance of 10mm from the wall of the cylinder, the solidification process is the sequence solidification, so that the shrinkage cavity is eliminated. The simulation results are verified by the production and the simulation results are in line with the actual production.