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Experimental Investigation of the Effect of Dielectric Conductivity on Characteristics of Micro-EDM Process

机译：介电电导率对微EDM工艺特性的实验研究

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Selection and modification of dielectric has been shown to affect machining characteristics such as process accuracy, material removal rate and surface finish in micro-EDM and is being explored by many for enhanced productivity of the process for industrial viability. Experimental investigation has been carried out in order to study the effect of electrical conductivity of deionized water as dielectric on the electrical breakdown, plasma discharge, and material removal across different voltage-gap combinations using three levels of conductivities, viz. 4 μS/cm, 200 μS/cm, and 410 μS/cm. It is found that higher dielectric conductivity facilitates dielectric breakdown lowering the minimum breakdown potential at a given inter-electrode gap, thereby, offering greater flexibility in the choice voltage and gap conditions. Also, higher conductivity results in more efficient debris removal from the discharge spot. Furthermore, for inter-electrode gaps of 0.5-2 μm, the micro-EDM process is found to be most efficient at deionized water conductivity of 200 μS/cm, as it uses least discharge energy and results in highest material removal per discharge.
机译：已经示出了电介质的选择和修改，以影响Micro-EDM的过程精度，材料去除率和表面光洁度等加工特性，并且许多人正在探索，以提高工业活力过程的生产率。已经进行了实验研究，以研究去离子水的电导率为电介质对电击穿，等离子体放电和使用三个电导率的电压组合的材料去除的影响。 4μs/ cm，200μs/ cm和410μs/ cm。发现较高的介电导率有助于降低给定电极间隙的最小击穿电位，从而促进了在选择电压和间隙条件下提供更大的柔韧性。此外，较高的电导率导致从放电点去除更有效的碎屑。此外，对于电极间隙为0.5-2μm，发现微EDM工艺在去离子水导率为200μs/ cm时最有效，因为它使用最小放电能量并导致每次放电的最高材料去除。

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