关键词: 支持向量机, 点云曲面, 等残留高度

Abstract: The existing method had some defects on solving measuring point's direct formation of tool path planning which satisfied certain condition. Therefore, a constant scallop-height tool path planning method based on Least Square Support Vector Machine(LS-SVM)for 3-axis machining of point cloud surface was proposed. The measured point fitting was constructed by using LS-SVM, and quadrilateral mesh generation was completed. Thus the gridding of measured point was reconstructed. The scallop surface and tool-center surface were obtained through offsetting the initial mesh with scallop-height and tool radius respectively. According to the geometric model of constant scallop-height tool path generation, the point cloud surface and constant scallop-height tool paths in rectangle domain was acquired by tool envelope surface intersecting with mesh model. The boundary feature points were extracted by method of boundary mesh extraction and Gauss mapping technique, and the tool paths of actual boundary domain were found out by boundary trimming. The effectiveness of proposed method was verified by examples and compared with the presented method of commonly used iso-planar machining. The results indicated that the present method could better solve the match conflict between machining precision and efficiency.

Key words: support vector machine, point cloud surface, constant scallop-height, tool path