Micro Electrical Discharge Machining of Ultrafine Particle Type Tungsten Carbide Using Dielectrics Mixed with Various Powders

Sai Dutta Gattu; Jiwang Yan

doi:10.3390/mi13070998

Micro Electrical Discharge Machining of Ultrafine Particle Type Tungsten Carbide Using Dielectrics Mixed with Various Powders

Sai Dutta Gattu, Jiwang Yan

Department of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

Electrical discharge machining (EDM) is widely used to machine hard materials, such as tungsten carbide; however, the machining rate and surface quality are low. In this research, the effects of mixing electrically conductive carbon nanofiber (CnF), semiconductive silicon (Si) powder, and insulative alumina powder (Al2O3) at different concentrations in a dielectric fluid were studied by observing single discharge craters and hole machining performance in the EDM of ultrafine particle type tungsten carbide. Craters obtained using carbon nanofiber and alumina were much smaller than in oil-only conditions. In contrast, The results show that adding CnF significantly improved the material removal rate under all conditions. Si and Al2O3 powders only improved the machining performance at a high discharge energy of 110 V. Furthermore, improvement in surface roughness was observed prominently at high voltages for all the powders. Among the three powders, alumina was found to improve the surface roughness the most.

Original language	English
Article number	998
Journal	Micromachines
Volume	13
Issue number	7
DOIs	https://doi.org/10.3390/mi13070998
Publication status	Published - 2022 Jul

Keywords

alumina
carbon nanofiber
micro-EDM
silicon
tungsten carbide

ASJC Scopus subject areas

Control and Systems Engineering
Mechanical Engineering
Electrical and Electronic Engineering

Access to Document

10.3390/mi13070998

Cite this

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title = "Micro Electrical Discharge Machining of Ultrafine Particle Type Tungsten Carbide Using Dielectrics Mixed with Various Powders",

abstract = "Electrical discharge machining (EDM) is widely used to machine hard materials, such as tungsten carbide; however, the machining rate and surface quality are low. In this research, the effects of mixing electrically conductive carbon nanofiber (CnF), semiconductive silicon (Si) powder, and insulative alumina powder (Al2O3) at different concentrations in a dielectric fluid were studied by observing single discharge craters and hole machining performance in the EDM of ultrafine particle type tungsten carbide. Craters obtained using carbon nanofiber and alumina were much smaller than in oil-only conditions. In contrast, The results show that adding CnF significantly improved the material removal rate under all conditions. Si and Al2O3 powders only improved the machining performance at a high discharge energy of 110 V. Furthermore, improvement in surface roughness was observed prominently at high voltages for all the powders. Among the three powders, alumina was found to improve the surface roughness the most.",

keywords = "alumina, carbon nanofiber, micro-EDM, silicon, tungsten carbide",

author = "Gattu, {Sai Dutta} and Jiwang Yan",

note = "Funding Information: Author Contributions: Conceptualization, S.D.G. and J.Y.; methodology, S.D.G. and J.Y.; software, S.D.G. validation, S.D.G. formal analysis, S.D.G.; investigation, S.D.G.; resources, J.Y.; data curation, S.D.G.; writing—original draft preparation, S.D.G.; writing—review and editing, J.Y.; visualization, S.D.G.; supervision, J.Y.; project administration, J.Y.; funding acquisition, S.D.G. and J.Y. All authors have read and agreed to the published version of the manuscript Funding: This research was partially supported by a grant from the Keio Leading-edge Laboratory of Science and Technology (KLL) and the Keio University Doctorate Student Grant-in-Aid Program from the Ushioda Memorial Fund. Publisher Copyright: {\textcopyright} 2022 by the authors. Licensee MDPI, Basel, Switzerland.",

year = "2022",

month = jul,

doi = "10.3390/mi13070998",

language = "English",

volume = "13",

journal = "Micromachines",

issn = "2072-666X",

publisher = "Multidisciplinary Digital Publishing Institute (MDPI)",

number = "7",

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T1 - Micro Electrical Discharge Machining of Ultrafine Particle Type Tungsten Carbide Using Dielectrics Mixed with Various Powders

AU - Gattu, Sai Dutta

AU - Yan, Jiwang

N1 - Funding Information: Author Contributions: Conceptualization, S.D.G. and J.Y.; methodology, S.D.G. and J.Y.; software, S.D.G. validation, S.D.G. formal analysis, S.D.G.; investigation, S.D.G.; resources, J.Y.; data curation, S.D.G.; writing—original draft preparation, S.D.G.; writing—review and editing, J.Y.; visualization, S.D.G.; supervision, J.Y.; project administration, J.Y.; funding acquisition, S.D.G. and J.Y. All authors have read and agreed to the published version of the manuscript Funding: This research was partially supported by a grant from the Keio Leading-edge Laboratory of Science and Technology (KLL) and the Keio University Doctorate Student Grant-in-Aid Program from the Ushioda Memorial Fund. Publisher Copyright: © 2022 by the authors. Licensee MDPI, Basel, Switzerland.

PY - 2022/7

Y1 - 2022/7

N2 - Electrical discharge machining (EDM) is widely used to machine hard materials, such as tungsten carbide; however, the machining rate and surface quality are low. In this research, the effects of mixing electrically conductive carbon nanofiber (CnF), semiconductive silicon (Si) powder, and insulative alumina powder (Al2O3) at different concentrations in a dielectric fluid were studied by observing single discharge craters and hole machining performance in the EDM of ultrafine particle type tungsten carbide. Craters obtained using carbon nanofiber and alumina were much smaller than in oil-only conditions. In contrast, The results show that adding CnF significantly improved the material removal rate under all conditions. Si and Al2O3 powders only improved the machining performance at a high discharge energy of 110 V. Furthermore, improvement in surface roughness was observed prominently at high voltages for all the powders. Among the three powders, alumina was found to improve the surface roughness the most.

AB - Electrical discharge machining (EDM) is widely used to machine hard materials, such as tungsten carbide; however, the machining rate and surface quality are low. In this research, the effects of mixing electrically conductive carbon nanofiber (CnF), semiconductive silicon (Si) powder, and insulative alumina powder (Al2O3) at different concentrations in a dielectric fluid were studied by observing single discharge craters and hole machining performance in the EDM of ultrafine particle type tungsten carbide. Craters obtained using carbon nanofiber and alumina were much smaller than in oil-only conditions. In contrast, The results show that adding CnF significantly improved the material removal rate under all conditions. Si and Al2O3 powders only improved the machining performance at a high discharge energy of 110 V. Furthermore, improvement in surface roughness was observed prominently at high voltages for all the powders. Among the three powders, alumina was found to improve the surface roughness the most.

KW - alumina

KW - carbon nanofiber

KW - micro-EDM

KW - silicon

KW - tungsten carbide

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Micro Electrical Discharge Machining of Ultrafine Particle Type Tungsten Carbide Using Dielectrics Mixed with Various Powders

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