整体涡轮叶盘五坐标数控电火花加工编程

摘要

The integral turbine blisk with twisted blades has complex structure .In the process of five‐axis NC electrical discharge machining (EDM ) ,the feed path of shaped electrode is complicated and the interference between workpiece and electrode can easily happen .To solve these problems ,a reverse search algorithm for the complicated feed path search in the process of five‐axis NC EDM of integral turbine blisk is proposed . Search process is described as follow s :the shaped electrode is designed using adjacent blade basin and dorsal surfaces of the blisk channel ,and then is moved and rotated by detecting interference between the shaped electrode and workpiece to find the reverse feed path .If the reverse feed path can not be found ,the process described above is repeated after modeling the shaped electrode with a less thickness .Thus ,the density‐reasonable NC path can be generated by using the proposed algorithm by controling the movement and rotation step of the shaped electrode ,at the same time the shaped electrode with optimized thickness is obtained .%　　大扭曲叶型带冠整体涡轮叶盘结构复杂，五坐标数控电火花加工中成型电极与加工工件极易发生干涉，成型电极进给轨迹复杂。针对上述问题，采用逆向搜索算法搜索成型电极进给轨迹。利用通道内相邻叶盆曲面、叶背曲面设计成型电极，由逆向搜索算法平移和旋转成型电极，再进行干涉检测；若无法得到合理加工轨迹，可减小成型电极厚度，重复该过程，直至成型电极安全退出，同时得到成型电极最优厚度。控制成型电极平移及旋转步长，生成密度合理的NC加工轨迹。系统验证表明，生成的NC加工轨迹优化、密度合理，成型电极厚度优化。