A review on the use of dielectric fluids and their effects in electrical discharge machining characteristics

Chakraborty, Sujoy; Dey, Vidyut; Ghosh, Subrata Kumar

doi:10.1016/j.precisioneng.2014.11.003

Cited by 155 publications

(69 citation statements)

References 36 publications

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“…The hardness values at the top surface of the white layer are in the range of 720 HV to 800 HV. The hardness may belong to TiC which was generated from an electrode material and carbon from dielectric fluid [15]- [19]. Normally, there are three zones on the workpiece when discharge on a steel: The white layer is on the top layer follows Heat Affected Zone (HAZ) and matrix [12], [13].…”

Section: International Journal Of Chemical Engineering and Applicatiomentioning

confidence: 99%

Comparison Performances of EDM on Ti6Al4V with Two Graphite Grades

Muttamara¹

2015

IJCEA

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Abstract-Technologies for EDM machining are demanded in many industrial fields. Graphite is widely used as electrode material in EDM. Graphite (Poco EDM-3) and copperinfiltrated-graphite (Poco EDM-C3) electrodes were used to compare the corresponding to EDM properties. The experiments were carried out on Ti6Al4V. Performance in respect to MRR and electrode wear is compared for two graphite qualities. The results show that EDM3 graphite performs very well giving significantly higher MRR than EDM-C3, and also with acceptable relative electrode wear. The surface roughness of workpiece produced by EDM-C3 is better than EDM-3 due to gap distance of EDM-C3 is larger than that produced by EDM-3. The two electrode materials give the same micro-hardness of the layers that are about 800 HV.

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Section: International Journal Of Chemical Engineering and Applicatiomentioning

confidence: 99%

Comparison Performances of EDM on Ti6Al4V with Two Graphite Grades

Muttamara¹

2015

IJCEA

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“…Hydrocarbon oil, usually paraffin oil and distilled water dielectric medium are used. Paraffin oil has greater arcing stability while distilled water has better surface finish [2]. Debris and bubbles are removed by dielectric flushing and its formation has direct relation with pulse duration and pulse current [21].…”

Section: Introductionmentioning

confidence: 99%

“…Tool wear ratio is almost zero and MRR is high when EDM is done with gas as dielectric and with the increase of oxygen concentration in air, the MRR increased [6,7]. The dielectric fluids used for EDM and their effects on generated surface were widely evaluated by S. Chakraborty et al [2]. Distilled water as compared to paraffin oil shows greater MRR and lower EWR.…”

Section: Introductionmentioning

confidence: 99%

EDM of Aluminum Alloy 6061 Using Graphite Electrode Using Paraffin Oil and Distilled Water as Dielectric Medium

Imran¹,

Rahmanshah²,

Mehmood³

et al. 2017

Adv. Sci. Technol. Res. J.

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EDM machining of Al 6061 was performed under varying conditions of pulse current and pulse duration. Graphite was used as an electrode material with distilled water and paraffin oil as two different dielectric mediums. The aim is to characterize the surface integrity produced as a result of EDM machining under both varying electrical and non-electrical parameters as it is important in determining the service life of EDM machined components. The vertical, horizontal and corner surfaces are studied independently for each single set of conditions. The average white layer thickness (AWLT) and surface roughness was found to be dependent on pulse current values and pulse duration. The dielectric medium also has an influence on the thickness and nature of white layer. It was found that the thickness and nature of the white layer formed from distilled water is different from that of paraffin oil. New methods of AWLT and surface roughness measurement through an optical microscope are described. The surface roughness method developed was calibrated against an identical surface roughness tester. Finally, material removal rate, tool wear rate, the presence of micro cracks, voids and globules were compared for different conditions and conclusions were drawn according to the actual physical conditions during machining.

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Section: Introductionmentioning

confidence: 99%

“…Proper dielectric circulation in the machining gap is required to maintain needed peak performance and to control the electric spark [4]. There are several functions of dielectrics: insulation, ionisation, cooling and waste removal [4]. Due to the fact that each dielectric has a specific composition and physical properties, it is very important to choose the one that would be optimal, ensuring the best surface integrity and accuracy in a particular situation.…”

Section: Introductionmentioning

confidence: 99%

Austenitic steel surface integrity after EDM in different dielectric liquids

Żyra

Bogucki

Skoczypiec

2017

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Austenitic steel surface integrity after EDM in different dielectric liquidsStan powierzchni stali austenitycznej po obróbce EDM w różnych ciekłych dielektrykach Abstract Electrodischarge machining (EDM) can be used as an alternative machining method compared to conventional ones, especially while very good surface integrity and high machining accuracy during machining of difficult-to-cut materials is needed. In EDM, the dielectric liquid has a crucial influence on the technological material surface integrity since it ensures the occurrence of controlled electrical discharges between the tool and the workpiece, cooling and solidification of gaseous EDM debris, removing erosion products and also dispersing heat generated during the process. In the paper, the influence of a carbonbased and a water-based dielectric liquid on the selected structural and morphological characteristics of 304 stainless steel after EDM sinking was investigated. The surface roughness, micro hardness and quality as well as the chemical changes after the corrosion test of machined surfaces were analysed.Keywords: electrodischarge machining, dielectric, surface layer, austenitic steel Streszczenie Obróbka elektroerozyjna (EDM) stanowi alternatywę dla konwencjonalnych metod obróbkowych, szczególnie przy kształtowaniu materiałów trudnoskrawalnych, gdy konieczne jest otrzymanie powierzchni o bardzo dobrej jakości. W EDM ciekły dielektryk ma kluczowy wpływ na właściwości technologicznej warstwy wierzchniej materiału obrabianego, umożliwiając zachodzenie kontrolowanych wyładowań elektrycznych pomiędzy elektrodą roboczą a przedmiotem obrabianym, schładzanie i usuwanie produktów powstałych w wyniku obróbki oraz odprowadzanie wygenerowanego w trakcie procesu ciepła. W artykule przedstawiono wpływ dielektryka węglowodorowego i wodnego na wybrane cechy strukturalne i morfologiczne stali nierdzewnej 304 po procesie drążenia elektroerozyjnego. Analizie poddano chropowatość powierzchni, mikrotwardość oraz zmiany składu chemicznego obrabianych powierzchni po przeprowadzonej próbie korozyjnej.Słowa kluczowe: obróbka elektroerozyjna, dielektryk, warstwa wierzchnia, stal austenityczna

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A review on the use of dielectric fluids and their effects in electrical discharge machining characteristics

Cited by 155 publications

References 36 publications

Comparison Performances of EDM on Ti6Al4V with Two Graphite Grades

Comparison Performances of EDM on Ti6Al4V with Two Graphite Grades

EDM of Aluminum Alloy 6061 Using Graphite Electrode Using Paraffin Oil and Distilled Water as Dielectric Medium

Austenitic steel surface integrity after EDM in different dielectric liquids

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