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<title-group><doi>009</doi>
<article-title>Improvements in Debris Flushing in Micro-Electric Discharge Machining using Atomized Dielectric Spray</article-title>
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<author>Arvind Pattabhiraman, Deepak Marla and Shiv Kapoor  </author>

<aff>Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, USA </aff>

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<title>ABSTRACT</title>
<p>The paper investigates the debris flushing in micro-electric discharge machining (micro-EDM) using atomized dielectric spray. The novel technique of atomized dielectric spray in EDM involves dielectric film formation and its penetration into the inter-electrode gap that not only acts as a sparking medium but also effectively removes the debris particles. Computational Fluid Dynamics (CFD) simulations based on discrete phase model (DPM) were carried out to predict the trajectories of the debris particles after the discharge. The model also accounts for (i) plasma pressure due to discharge, (ii) actual crater geometry produced due to discharge and (iii) different sizes of debris particles through a Rosin-Rammler distribution. Single discharge experiments with atomized dielectric spray were carried out and the distribution of the debris particles after the discharge was measured using high magnification SEM images of the machined surface. The numerical results of debris distribution around crater are found to be in good agreement with that of experiments. The results suggest a significant improvement in debris flushing using atomized dielectric spray in micro-EDM.  </p><p><italic>Keywords: </italic>EDM, Atomized dielectric spray, Film formation, Debris flushing and discrete phase model. </p>
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