Study on damage boundary extraction and shape reduction of laser cladding parts

In order to extract the damage boundary of parts quickly and accurately, observe the process and results of parts damage and realize the shape reduction, and repair complex damaged parts by laser cladding remanufacturing, the defect types of the damaged parts were divided according to process characteristics of laser cladding, the damage boundary extraction and shape reduction methods of different types of defects were studied. The method of extracting boundary features of surface spots based on the curvature threshold and the normal vector threshold and the method of extracting boundary features of local deep damage based on 3-D comparison were proposed. The methods of shape reduction were presented, for the local deep damage parts by the traditional surface and for the superficial damage parts by the NURBS surface. And then, the experiments of laser cladding remanufacturing and restoration were carried out to verify the feasibility of the proposed method by path planning. The results show that the precision and efficiency of the extraction and restoration of the damaged area are improved and the cladding morphology waviness is smaller. The study provides the theoretical basis for the application of extraction and shape reduction of the damaged parts in laser cladding remanufacturing.