运用铸造数值模拟软件Pro CAST,对DF-300A减速机箱体的铸造工艺方案进行充型和凝固过程的数值模拟,分析铸件充型和凝固的状态以及温度场的变化情况。针对温度对阶梯式浇注工艺方案的充型和凝固过程的影响进行数值模拟,根据分析结果对箱体的铸造方案进行优化改进并确定最优浇注温度为1 400℃。通过增加冒口尺寸及数量、增加冷铁、改变铸件的圆角大小等方式有效地控制了缩孔、缩松缺陷的产生,提高了铸件品质和合格率。 The casting numerical simulation software Pro CAST was used to simulate the process of filling and solidification of DF-300A reducer box casting process. The state of filling and solidification and the change of temperature field were analyzed. According to the influence of temperature on the filling and solidification process of stepped pouring process, numerical simulation was carried out. Based on the analysis results, the casting scheme of the box was optimized and optimized and the optimum pouring temperature was determined as 1400 ℃. By increasing the riser size and quantity, increasing the chill iron, changing the fillet size of castings, etc., the shrinkage holes and shrinkage defects are effectively controlled and the casting quality and passing rate are improved.