机床底座ProCAST数值模拟及铸造工艺优化

ProCAST numerical simulation and casting process optimization of machine tool base

中型灰铸铁机床底座铸造过程中,补缩不足使铸件厚大部分产生较大缩松缩孔,用Creo进行机床底座3D建模,通过3D打印制作分析模型;用ProCAST软件对充型与凝固过程进行多方案、多次有限元分析及仿真模拟。结果表明:铸件厚大部位易产生热节,冷却后产生缩松缩孔,用增加冒口与铺设冷铁等方案优化铸造工艺,使铸件自然补缩,最终实现自下而上的顺序凝固,有效避免产生较大热节,解决了铸件的缩松缩孔缺陷。

During the casting process of medium-sized gray iron machine tool base,the insufficient complementation causes large shrinkage hole in most parts of the casting thickness. The 3D model of machine base was built by Creo,and the analysis model was established by 3D printing technology. The filling and solidification process of alloy were analyzed and simulated using ProCAST software. The simulation results show that hot joints are easy to occur in thick and large parts of castings,and shrinkage holes produce after cooling. The casting process is optimized by increasing risers and laying cold iron,so that the natural shrinkage of castings can be solidified sequentially from bottom to top,which effectively avoids large hot joints and solves the shrinkage holes defect of castings.