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Abstract
In this paper, the numerical simulation of the mold filling process for TiAl alloys exhaust valve castings was performed. The relationship between melt cross-section area during mold filling, free surface inclined angle and mold filling distance was derived. Based on the analysis of the force exerted on the liquid during centrifugal casting and the Navier-Stokes equation of liquid flow and the equation of continuity, a numerical simulation model for the mold filling process of centrifugal casting of TiAl alloy exhaust valves was developed. A mold filling experiment of centrifugal casting was carried out using paraffin as the simulation fluid. The actual data of melt cross-section area and free surface inclined angles of fluid at different rotation speed were obtained. The comparison shows that the results of simulation agree with those of experiments.