Research On Key Techniques For Precise Shape-controlling Method Of Film Cooling Holes In Turbine Blades

Film cooling can effectively improve the high temperature creep resistance of aero engine hot end components.The work efficiency of the air film holes needs to be ensured by the geometric modeling accuracy and the positioning accuracy.In this paper,aiming at the lack of accurate shape control method in the process of gas film hole processing,an error analysis method of gas turbine hole manufacturing chain for hollow turbine blades and an accurate positioning method of gas film hole are proposed.An accurate positioning platform for gas film holes is established.Then a closed-loop hollow turbine blade manufacturing system for monitoring data is realized.The main research contents of this article include:1.The Structured-light 3D scanner is used to accurately collect the point cloud data of the hollow turbine blade.The point cloud data is simplified and feature extraction is performed to obtain an accurate point cloud model.2.According to the feature pre-registration and the principle of SVD-ICP accurate registration,the point cloud model and the CAD model are registered;After the registration is completed,the cross-sectional contour lines of the hollow turbine blade scanning point cloud model and the design model are compared and analyzed.The manufacturing error of the blade was analyzed;based on the error analysis,the film hole parameters were corrected and a new film hole positioning parameter was obtained.3.The film hole positioning platform was established,and different functional modules were designed to guide the actual processing.4.Numerical simulation verification of film hole shape parameter correction method,and the positioning accuracy of the film hole processing system is verified by experiments.