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Classification and comparative study of EDM pulse generators

机译：EDM脉冲发生器的分类和比较研究

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摘要

Electrical discharge machining (EDM) is a non-conventional machining technique that requires pulse generators to create sparks between the tool and the workpiece. Classical texts describe only two types of EDM pulse generators (EPGs), although there are several different types. This work presents a classification and detailed comparative study of 13 important EPG topologies from the power electronics perspective. The operation of each topology is explained using simulation studies for EDM load with spark current of 10 A and pulse repetition frequency of 1 kHz. Control schemes of each topology are explained from the viewpoint of mechanical performance parameters, viz. material removal rate, surface finish, and tool electrode wear ratio. A general analytical methodology to compute efficiency based on machining duty is illustrated considering the existence of two distinct switching frequencies. Overall comparison between EPG topologies is presented considering control aspects, size, efficiency, voltage stresses and suitability for any required application. As an example, a case of investigation of cutting silicon ingots with wire EDM is considered and experimental results are provided for the same. This work can be used as a guideline to understand and develop EPG based on particular target specifications.
机译：电放电加工（EDM）是一种非传统加工技术，需要脉冲发生器在工具和工件之间产生火花。古典文本只描述了两种类型的EDM脉冲发生器（EPG），尽管有几种不同的类型。本作品介绍了从电力电子设备视角的13个重要EPG拓扑的分类和详细比较研究。使用仿真研究来解释每个拓扑的操作，用于EDM负载，火花电流为10A和脉冲重复频率为1 kHz。从机械性能参数，viz的角度解释了每个拓扑的控制方案。材料去除率，表面光洁度和刀具电极磨损比。考虑到存在两个不同的开关频率的存在，示出了基于加工占运效率计算效率的一般分析方法。考虑到任何所需应用的控制方面，尺寸，效率，电压应力和适用性，提出了EPG拓扑之间的总体比较。作为一个例子，考虑使用线EDM切割硅锭的研究，并且为其提供了实验结果。这项工作可用作基于特定目标规范的理解和开发EPG的指导。

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