Research On Rapid Tooling Design And Forming Simulation Of Investment Casted Hollow Turbine Blade Wax Pattern

The high pressure turbine rotor blade is the key part of aero engine.Because of the complicated cooling passage in the blade,it needs to be produced by the method of investment casting.In the process of the investment casting,the shape of the wax pattern is eventually transferred to the casting,so it is an important factor to determine the precision of casting.Because the wax pattern needs to be formed in the mold,it is necessary to find an accurate and economical method for the rapid tooling of turbine blade wax mold.In this paper,aimed at the problem of poor heat dissipation in the existing turbine blade wax mold,the CAD/CAM/CAE technology is used to design a conformal cooling wax mold with metal material and simulate the wax molding.Firstly,on the basis of the establishment of the wax mold cavity CAD model of the turbine blade,a rapid tooling method for the wax mold of the blade based on the "embedded pipe casting" is proposed,inside which a kind of ceramic core location method is also put forward;Secondly,the conformal cooling channels of the turbine blade wax injection mold are designed using CAD modeling and ANSYS cooling simulation,and good temperature uniformity is acquired.Finally,the Moldflow software is used to simulate the wax injection process of the turbine blade,in order to preliminary demonstrate the feasibility of conformal cooling mold.By comparing the warping deformation of the wax patterns formed by the conformal cooling mold and the traditional straight cooling mold,it shows that uneven cooling deformation of the wax pattern shaped by the conformal cooling mold is 0.019 mm.It is reduced by 2/3 than the straight cooling mold,and the cooling time is reduced by 44 seconds.Cooling efficiency and uniformity are greatly improved,which demonstrates that the wax mold method proposed in this paper has highly practical value.