Electrical discharge machining (EDM) is one of the most explored nonconventional machining processes due to its ability to machine intricate shapes on conductive materials. However, tool wear is one of the major challenges in the EDM process as it directly affects the accuracy of machining, surface roughness, reproduction of geometrical characteristics on the workpiece and cost of the process. Lots of work have been done to minimize the tool wear by improving the discharge conditions by controlling the EDM process parameters, varying the dielectric characteristics, powder-mixed dielectric methods and ultrasonic-assisted methods. However, minimizing the tool wear by the above approaches also constrains the material removal rate from the workpiece and accuracy of the process. This review highlights the efforts done by the researchers to improve tool wear by recently developed techniques or modifications. Researches available in the field of using treated tool electrode, cooled tool electrode, coated tool electrode, noble tool materials and other techniques are highlighted.

中文翻译：

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放电加工中减少刀具磨损的最新方法综述

电火花加工 (EDM) 是探索最多的非常规加工工艺之一，因为它能够在导电材料上加工复杂的形状。然而，刀具磨损是 EDM 工艺中的主要挑战之一，因为它直接影响加工精度、表面粗糙度、工件几何特征的再现和工艺成本。通过控制 EDM 工艺参数、改变介电特性、粉末混合介电方法和超声辅助方法来改善放电条件，以最大限度地减少工具磨损已经做了大量工作。然而，通过上述方法最大限度地减少刀具磨损也限制了工件的材料去除率和工艺的准确性。这篇综述强调了研究人员通过最近开发的技术或修改来改善工具磨损所做的努力。重点介绍了在使用处理过的工具电极、冷却的工具电极、涂层工具电极、贵重工具材料和其他技术领域的研究。