关键词: 最小二乘支持向量机, 点云曲面, 刀具路径, 数控加工

Abstract:

Aiming at the tool path planning problem of single-valued scattered point cloud surface, an algorithm based on LS-SVM was proposed. In the calculation process, a 2D point set was acquired by projecting the measured points onto plane, and the boundary feature points were extracted by method of meshing and Gauss mapping of points within boundary mesh. Thus the actual machining region was defined by the boundary points, and the parallel iso-planar tool path was planned in the planar region. Then the fitting surface model of the measured points was constructed by using LS-SVM. Mapping 2D tool paths to 3D space with this model, the cutter contact points were found out. Ultimately the cutter location points were obtained by offsetting cutter contact points along normal direction. The proposed algorithm was verified by an example. The results indicate that the present method can better solve the tool path generation problem of the incomplete measured points.

Key words: least square support vector machine(LS-SVM);point cloud surface, tool path, NC machining