关键词: 多面体加工, 曲率半径估算, 行距计算, 圆弧拟合, 拟合约束条件, 算法

Abstract: To improve the efficiency of polyhedral machining, an arc tool path generation algorithm in polyhedral machining was proposed. Initial line tool paths were firstly obtained by intersecting offset surface of polyhedral model with a series of sections. The curvature radiuses in the direction and the interval direction of the tool paths were estimated by vertexes curvatures of the offset surface, and tool path intervals were determined by scallop height and these curvature radiuses. Then, an algorithm named curvature radius adjustment was proposed, and the concepts of fitting constraint condition and adjustment parameter of curvature radius were introduced in the algorithm. Within the scope of fitting precision, iteration method was used to determine adjustment parameter of curvature radius so as to determine fitting arcs. Finally, experimental results indicated that the arc tool paths generated by the proposed algorithm hold G1 continuity and fewer arc segments, and were suitable for improving the machining efficiency.

Key words: polyhedral machining, curvature radiuses estimation, path intervals calculation, arc fitting, fitting constraint condition, algorithm