电极损耗对工件加工质量的影响显著，为保证微细电火花铣削的加工精度，需要对工具电极给予合理补偿。基于倒圆锥形电极端面，采用定长补偿法模型，进行了微型槽电火花分层多道铣削实验，并在此基础上采用层间正交加工轨迹以及通过机器视觉技术采集到稳定加工后的电极端部图像，进而确定合理的轨迹重叠路径。实验结果表明，此电极补偿模型能够有效的对电极损耗进行补偿，并且正交轨迹加工方法使加工时间缩短了50%，残切去除明显，获得了良好的加工精度。采用超景深显微镜观察所加工的微型槽底截面的直线度很好，加工深度偏差在2μm左右。%The effect of electrode wear is significant on machining quality, in order to ensure the processing precision of micro-EDM milling, the reasonable compensation for the tool electrode need to be given. In this paper, based on the inverted conical end of electrode and the model of fixed length compensation method to machining the micro groove with micro-EDM by layered milling experiment is adopted, moreover, the orthogonal machining path and the machine vision technology to obtain the stable end of the electrode image is adopted after processing, and then the reasonable path of trajectory overlap is determined. The experimental results show that the electrode wear can be availably compen-sated by the electrode compensation model and the processing time is shortened by 50% with the machining method of orthogonal trajectories,and the residual cut can be removed obviously by the method and good machining precision can be gained.The bottom section linearity of micro groove is very good and the processing error of the micro groove depth is about 2 μm by the optical microscope.
展开▼
