面向板材渐进成形工艺的单元路径生成

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.

Unit tool-path generation using sheet metal incremental forming process

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.