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Finishing performance of die-sinking EDM with ultrasonic vibration and powder addition through pulse train studies
, R. Rajeswari
Published in Taylor and Francis Inc.
2019
Volume: 24
   
Issue: 2
Pages: 245 - 273
Abstract

Die-sinking electrical discharge machining (EDM) is widely used in die and mold-making industry. Finish EDM conditions are often selected to produce good quality surfaces. Attempts to enhance the finishing capabilities using ultrasonic vibration and powder-added dielectric medium have been reported in the literature. However, the changes in the gap phenomena with ultrasonic assistance and powder addition have not been analyzed. In this article, finish EDM of hardened D3 steel has been carried out based on full factorial design of experiment with three levels of setting voltage, setting current and pulse on time. The performance of ultrasonic assisted and graphite powder-added EDM are evaluated by analyzing the voltage and current pulse trains in finishing operation for the first time. Based on two new parameters, namely energy expended over a second (E) and ratio of energy due to sparks in relation to total discharge energy (PF), the results are discussed and also compared with those obtained with conventional EDM for selected conditions. Even though E of 102.9 J (PF = 0.862) with ultrasonic vibration is higher than E of 43.0 J (PF = 1.0) with powder mix, the molten metal is removed effectively from the gap by ultrasonic vibration which results in a relatively better surface. The micrographs of cross-section and surface of the workpieces obtained using optical and scanning electron microscopes, respectively, also reveal their relative performance. © 2019, © 2019 Taylor & Francis Group, LLC.

About the journal
JournalData powered by TypesetMachining Science and Technology
PublisherData powered by TypesetTaylor and Francis Inc.
ISSN10910344
Open AccessNo
Concepts (16)
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    Design of experiments
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    Electric discharges
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    Liquid metals
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    Powder metals
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    Scanning electron microscopy
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    Surface roughness
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    ULTRASONIC EFFECTS
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    Ultrasonic waves
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    Vehicle performance
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    Electrical discharge machining
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    FINISH EDM
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    Micrographs
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    POWDER ADDITIONS
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    PULSE CHARACTERISTICS
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    ULTRASONIC VIBRATION
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    Electric discharge machining