Makino铣床大型床身铸造过程模拟及工艺优化

Parameters Optimization for Casting Process of Makino Milling Machine Based on Numerical Simulation

针对Makino铣床床身铸造工艺,利用Anycasting软件模拟了铸件的充型和凝固过程,分析了铸件成形过程中内部温度场、流场的变化规律。通过综合考虑浇注温度(1 280、1 320、1 360和1 400℃)和充型速度(1.0、1.2和1.4m/s)对成形的影响,得出浇注温度和充型速度对铸件品质的影响。结果表明,采用优化浇注工艺参数(浇注温度为1 320℃,充型速度为1.2m/s),在合理位置处设置冒口,把最后凝固位置控制在冒口内部,可解决气孔缺陷。以铸件内部温度场分布为依据,减小了铸件缩孔倾向,为实际生产提供参考。

According to casting process of large Makino milling machine body, the filling and solidification process were simulated by the Anycasting software to understand temperature field and flow field. Aecording to effect of filling temperature（1 280 ℃ ,1 320 ℃ ,1 360 ℃ ,1 400 ℃） and filling speed（1.0 m/s, 1.2 m/s,1.4 m/s） on the casting process,influencing factors on the quality of milling machine body were analyzed. The results reveal that gas holes in the castings can be eliminated by adopting optimized parameters such as pouring temperature of 1 320 ℃ and filling velocity of 1.2 m/s as well as setting a riser at rational position to control the final solidification in the riser. Based on the temperature distribution in the milling machine body, shrinkage porosity （holes） is reduced, which provides a reference for practical production.