Assessment of electrode wear measurement in micro EDM milling
Assessment of electrode wear measurement in micro EDM milling
复制标题
微细电火花铣削中电极磨损测量的评估
DOI：
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发表时间：
2010
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通讯作者：
Valentinčič Hsu
中科院分区：
文献类型：
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作者：
Bissacco G;Tristo G;Valentinčič Hsu
在微细电火花铣削（微细EDM铣削）中，工具电极运动学与常规铣削中相同，但是材料去除是通过工具电极和工件之间的差距中的热和电力来获得的。微细电火花铣削加工中的电极损耗是提高加工精度必须解决的主要问题之一。最常见的是，电极线性磨损是通过在加工一定数量的层后用电极接触参考点来测量的。由于磨损而导致的电极长度的减少用于修改电极轨迹。提出了一种微细电火花铣削加工电极磨损的评价方法.实验在最先进的微细电火花加工设备上进行。如已经描述的，以常规方式在机器上测量电极磨损。此外，激光扫描测微仪（LSM），以及在机器上实现，被用于两种方式，即只检测电极头的坐标之前和之后的加工，并通过获取电极轮廓。通过使用几种层厚度和各种工艺参数在钢中加工微观特征来进行实验。结果表明，通过接触参考点的电极长度测量的精度是足够准确的电极线磨损的估计。但为了准确测量电极体积磨损，需要根据加工前后获得的电极轮廓来计算。
In micro electrical discharge milling (micro EDM milling), the tool electrode kinematics is the same as in conventional milling, but the material removal is obtained by the heat and electrical forces in the gap between the tool electrode and the workpiece. The electrode wear in micro EDM milling is one of the main problems to be solved in order to improve machining accuracy. Most common, the electrode linear wear is measured on machine by touching the reference point with the electrode after machining a certain number of layers. The reduction of the electrode length due to the wear is used to modify the electrode trajectory. This paper presents an assessment of the electrode wear on micro EDM milling machine. The experiments were performed on state-of-the-art micro EDM equipment. The electrode wear was measured on the machine in a conventional manner as already described. Additionally, a Laser Scan Micrometer (LSM), implemented on machine as well, was used in two ways, namely to detect only the coordinates of the electrode tip before and after machining, and by acquiring the electrode profile. Experiments were performed by machining micro features in steel using several layer thicknesses and various process parameters. The results show that the accuracy of the electrode length measurement by touching the reference point is enough accurate for the estimation of the electrode linear wear. But to accurately measure the electrode volumetric wear, it needs to be calculated from electrode profiles acquired before and after machining.