基于STL模型的双面数控渐进成形干涉检查与修正

针对双面数控渐进成形中工具头与板材之间容易发生干涉的问题, 提出了基于STL模型的工具头与板材干涉检查与修正方法。对于主工具头，采用等距面生成无干涉的成形轨迹，以避免干涉；对于副工具头，将干涉类型分为工具头与板材非成形特征区的干涉和工具头与板材成形特征区的干涉两种类型，并通过判断副工具头刀位点与支撑面的位置关系来确定是否发生干涉。算法应用实例和成形实验结果表明，所提出的算法能够避免干涉，进而生成无干涉的工具头运动轨迹。

STL Model Based Interference Check and Correction in Double Sided CNC Incremental Forming

For the problems of the interferences were easy to occur between the tool head and sheet metal in the double sided CNC incremental forming, a interference check and correction method was proposed based on the STL model. For the main tool head, the non-interference forming toolpath were generated to avoid the interference by using the equidistant surfaces. For the vice tool head, the interference types were divided into the interferences between the tool head and the areas of the forming characteristics and the interferences between the tool head and the areas of the non-forming characteristics. And the position relationship between the cutter location points of the vice tool head and the support surfaces was used to judge whether the interference occured. The case studies and the forming experimental results show that the interferences may be avoided and the interference free toolpaths of the tool head may be generated by using the proposed algorithm.