WITHDRAWN: A review on electrical discharge machining and its characterization

Panda, Rames C.; Sharada, Anuranjan; Samanta, Lokanatha Dhall

doi:10.1016/j.matpr.2020.11.546

Cited by 8 publications

(3 citation statements)

References 18 publications

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“…Such discrepancy may be attributed to the nature of species produced by the discharges. Indeed, discharges sustained in water produce highly reactive species (O, OH, H 2 O 2 , etc) that may promote electrode erosion through chemical reaction [34][35][36], in addition to the phenomena aforementioned. Moreover, the discharge lifetime in water is relatively longer than that in heptane (emission of light observed during ∼800 ns in water and ∼500 ns in liquid hydrocarbons; results not shown here).…”

Section: Discharge Probabilitymentioning

confidence: 99%

Statistical analysis of pulsed discharges in dielectric liquid: effects of voltage amplitude, pulse width, electrode configuration, and liquid composition

Bourbeau¹,

Dorval²,

Valensi³

et al. 2021

J. Phys. D: Appl. Phys.

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Discharge in dielectric liquid is an active field of research involved in many technological applications. Such multiple discharges are often applied during an experiment and that the electrode and liquid are altered by these stochastically behaving discharges. Therefore, it is important to address the variation of discharge characteristics as a function of discharge occurrence. In this study we analyze the electrical characteristics of multiple discharges run at low repetition rate (5 Hz) in a liquid of known initial composition using an electrode with a specific geometry. The discharges are run continuously until they fail to occur due to the increase in gap distance, and the recorded voltage and current waveforms are processed using an algorithm in order to determine the probability of discharge occurrence, breakdown voltage, discharge current, and discharge delay. The injected charge and energy of each discharge are also calculated. Furthermore, the effects of applied voltage, pulse width, electrode configuration, and liquid composition on the characteristics of the discharge are investigated. The obtained results demonstrate that the highest and lowest numbers of occurred discharges are achieved using the plate-to-plate and pin-to-pin configurations, respectively. Moreover, the composition of the liquid has an appreciable effect on the discharge current, as well as on electrode erosion. For discharges in water and cyclohexane, we measured the lowest and highest current, respectively. As for the erosion rate, it was comparable for the three liquid hydrocarbons but relatively smaller than that in water. The plot of breakdown voltage as a function of discharge current varies depending on the discharge parameters and displays regions that may be linked to the ignition mechanisms. The original data reported herein is of great significance for various applications that utilize repetitive discharges in liquid.

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Section: Discharge Probabilitymentioning

confidence: 99%

Statistical analysis of pulsed discharges in dielectric liquid: effects of voltage amplitude, pulse width, electrode configuration, and liquid composition

Bourbeau¹,

Dorval²,

Valensi³

et al. 2021

J. Phys. D: Appl. Phys.

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“…The material is removed by electrothermal phenomena in which electrical discharges occur between the tool electrode and the workpiece immersed in a dielectric liquid [3]. This liquid (e.g., distilled water, ethylene glycol) is designed to separate the electrode from the machined surface to obtain a high electric current density, as well as to cool the electrode and remove molten particles from the machining area [4]. A series of electrical discharges are separated by a constant spark gap [5].…”

Section: Introductionmentioning

confidence: 99%

“…A series of electrical discharges are separated by a constant spark gap [5]. The susceptibility of a material to electrical discharge depends mainly on its electrical conductivity as well as electrical resistance, melting point, and thermal conductivity [4].…”

Section: Introductionmentioning

confidence: 99%

Discharge Energy as a Key Contributing Factor Determining Microgeometry of Aluminum Samples Created by Electrical Discharge Machining

2021

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The aim of this study is first to determine the effect of the discharge energy on the surface microgeometry of aluminum samples created by electrical discharge machining (EDM). Secondly, an additional purpose is to demonstrate the differences between the geometric multiscale methods: length-, area-scale, and curvature. Eleven samples were manufactured using discharge energies ranging from 0.486 mJ to 1389.18 mJ and, subsequently, measured with focus variation microscopy. Standard ISO and multiscale parameters were calculated and used for surface discrimination and regression analysis. The results of linear, logarithmic, and exponential regression analyses revealed a strong correlation (R2 > 0.9) between the geometrical features of the surface topography and the discharge energy. The approach presented in this paper shows that it is possible to shape surface microgeometry by changing the energy of electrical discharges, and these dependencies are visible in various scales of observation. The similarities of the results produced by curvature and length-scale methods were observed, despite the significant differences in the essence of those methods.

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