双级带冠整体涡轮叶盘数控电火花加工路径规划

Electrode Design and Path Optimization of Five-axis Numerical Control EDM Machining for Integral Turbine Blade

由于双级带冠整体涡轮叶盘具有结构通道狭小、叶片扭曲的特点,传统数控加工时刀具可达性差,多轴数控电火花加工是其主要的加工方法。针对在电火花加工过程中成型电极复杂、路径规划困难等问题,采用逆向搜索算法进行轨迹规划。首先,完全填充叶盘相邻叶片通道,其次,在对电极减厚的基础上,使电极在通道内进行平移和旋转运动,进行干涉检查及电极厚度优化,直至生成优化成型电极或剖分电极及相应电火花加工轨迹。通过验证,表明设计的电极在双级带冠整体涡轮叶盘的数控电火花加工中可行,路径规划合理。

Due to the narrow structure channel and the twisting of the blade, the multi-axis CNC EDM has become its main processing method. Aiming at the problem that the electrode is easy to interfere with the turbine blade during the processing, and the path planning is difficult, the shape of the adjacent vane channel with the electrode completely filling the l turbine blade is proposed as the basis of the electrode design. At the same time, the thickness of the electrode is optimized to make the electrode perform translational and rotational movement in the channel for interference check. If a reasonable path cannot be obtained, the thickness of the electrode is reduced, and the search process is repeated, and the shaped electrode is subjected to a splitting process until a path free of interference at the maximum dimension of the shaped electrode is obtained. Through system verification, the feasibility of the designed electrode in the numerical control EDM of the turbine's integral double-leaf disc is demonstrated, and the leaf disc can be processed along the planned path.