In view of the investment casting process of turbine rear frame strut

the ProCAST software was adopted to simulate the filling process

cavity pressure evolution

and shrinkage cavity defects and the causes of the defects was analyzed. On this basis

the process was optimized by improving the exhaust passage

adjusting the pouring position

pouring time of the strut

and the solidification sequence of the casting

and the numerical simulation was carried out. The results indicate that the filling process of the optimized process is stable without “suffocation” phenomenon in the cavity and shrinkage and cavity defect in the strut. The actual casting verification demonstrates that the casting quality meets the ASTM E192 standard.