Geometric model reconstruction and CNC machining for damaged blade repair

ABSTRACT A novel method for geometric model reconstruction of a damaged blade is presented to improve the precision machining of aero-engine blade repair. Based on the theoretical model of the blade, the iterative closest point (ICP) algorithm is used to determine the relationship between the measuring points and the theoretical model. Blade deformation mechanisms are analyzed to construct the fitting function of the blade deformation distribution and blade height. The spline interpolation method for local correction is then used to eliminate abrupt changes of the curvature, and it can guarantee the smoothness of the blending surface between the undamaged area and repaired area of the blade. The tool path is planned for the computerized numerical control (CNC) machining of the damaged area. A machining experiment of a repaired blade is carried out, and the machining results verify that the method presented in this paper is valid.

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