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Parametric Study of Electric Discharge Coating using Powder Metallurgical Green Compact Electrodes

机译：粉末冶金生坯电极放电涂层的参数研究

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摘要

This paper describes the influence of powder metallurgical (P/M) electrodes on the surface of mild steel in electric discharge machining. An attempt has been made to deposit a uniform layer of tungsten and its carbide over the mild steel substrate using P/M green compact tools by electric discharge coating process. In this experimental work, W and Cu powders of 325 mesh size have been selected as electrode material and mild steel as workpiece material. A detailed investigation of process parameters, such as composition, compaction load, current, on-time, and off-time, which influence the material transfer rate (MTR), tool wear rate, roughness, and layer thickness, has been performed. Highest MTR of 281 mg/min and LT of 1262.99 μm have been achieved successfully. The hardness of deposited layer has been measured which proves that the deposited layer is 5-6 times harder than the substrate material.
机译：本文介绍了粉末冶金（P / M）电极对放电加工中低碳钢表面的影响。已经尝试使用P / M生坯工具通过放电涂覆工艺在钨钢基底上沉积均匀的钨及其碳化物层。在本实验工作中，已选择325目大小的W和Cu粉末作为电极材料，并选择软钢作为工件材料。进行了详细的工艺参数研究，例如成分，压实载荷，电流，接通时间和断开时间，这些参数会影响材料传输速率（MTR），工具磨损率，粗糙度和层厚。已成功实现281 mg / min的最高MTR和1262.99μm的LT。测量了沉积层的硬度，这证明了沉积层的硬度是基材的5-6倍。

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