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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 the process of precision casting, the ceramic core has mechanical resistance to the solidification and shrinkage. Therefore, the complex structure of the ceramic core greatly affects the dimensional accuracy of the hollow turbine blade. Based on the casting numerical simulation method, the influence of ceramic core structure on the deformation of the blade was analyzed. ProCAST software was used to simulate the solidification process of the hollow turbine blade to obtain the deformation displacement field. The displacement fields obtained from three different ceramic cores were analyzed. The comparison of deformation trend of displacement shows the regularity of the effect of ceramic core structure on the deformation of the blade, which provides a quantitative basis for mold optimization.