陶瓷型芯结构对涡轮叶片型面精度影响的仿真研究

摘要

在精密铸造成形过程中,陶芯对凝固收缩存在机械阻力,因此,陶瓷型芯的复杂结构对空心涡轮叶片型面尺寸精度有较大的影响.基于精铸数值模拟方法,分析了陶瓷型芯结构对叶片变形影响的规律.借助ProCAST软件对空心涡轮叶片的凝固过程进行仿真,获得变形位移场.分析了由三种不同结构陶瓷型芯所得的位移场,采用位移量变形趋势图对比的方式揭示了陶瓷型芯结构对叶片变形影响的规律,为模具优化提供量化依据.%In precision casting process, due to the mechanical resistance of solidification shrinkage of ceramic core,and the structure also had an important influence on the blade surface dimensional accuracy. Based on precision casting numerical simulation method, the influences of the ceramic core structure on blade deformation rule were analyzed. Its solidification process was simulated and the deformation displacement field was obtained by using ProCAST software. Three different structures of ceramic core in the displacement field were analyzed by the displacement deformation trend graph comparison method,the influence rule of ceramic cores structure on blade deformation was obtained. It provides a basis for optimal die.