Optimization of wax pattern die profile for turbine blade based on mean camber line

Aiming at the problem of complex turbine blade's shape accuracy was difficult to control, an optimization design method of wax pattern die profile for turbine blade based on mean camber line was proposed. The parameters describing the geometric characteristic of mean camber line were extracted and analyzed, and inverse iterative method was applied to the analytic results. The optimized wax pattern die profile was established by restoring the blade shape and reconstructing the blade body, and nolinear deformation compensation of the turbine blade in solidification process was realized. The post-processing of surface smoothing and surface patching was no longer needed as comparing to the reverse method based on Finite Element Method (FEM). By studying the investment casting of a typical blade, substantial reduction in dimensional and shape tolerances was achieved with the proposed die shape optimization method. The numerical simulation tallied with experiment result. After four iterations, the two-dimensional mean deviation obtained form casting model and design model decreased to 0.11151 mm from the previous 0.35094 mm.