中文摘要：

针对板材渐进成形工艺成形时间长的问题，提出一种基于单元的成形路径生成方法．首先，分析适用于渐进成形工艺的单元路径规划原则；然后，对数据模型进行分层计算得到一系列等高线刀位点轮廓，建立每层轮廓内的环之间的拓扑关系（C-Net结构），以及每层轮廓之间的拓扑关系（Z-C-Net结构）；最后，结合单元路径规划原则，从Z-C-Net结构中提取出单元序列，并对各个单元实施合适的子路径规划，以及子路径之间实施合理的连接，使成形路径最短．实例计算结果表明：应用单元路径规划与等高线路径规划相比，可节约22．5％的成形时间．

英文摘要：

As sheet metal incremental forming（IF） process would require a long time process,thus a unit tool-path generation method was presented.First,the applicable unit tool-path planning（UTPP） principle for IF was analyzed.Second,the triangular mesh model was sliced and a series of Z-constant cutter location contours（CLC） was calculated,and then the topological relations between the contours in every CLC（C-Net data structure） and between all CLCs（Z-C-Net data structure） were built.Finally,combined with the UTPP principle,the total length of the tool-paths was minimized by extracting the unit sequence from the Z-C-Net data structure,performing every unit with suitable sub-path planning style,and the valid linking paths among the sub-paths was obtained.Several examples prove that compared with the Z-constant tool-path generation algorithm in the IF,the unit tool-path generation algorithm can save as much as 22.5% process time cost.