Uses of Various Dielectrics in Electro Discharge Machining (EDM) – A Critical Review


Authors : Shatarupa Biswas; Manidipto Mukherjee

Volume/Issue : Volume 8 - 2023, Issue 6 - June

Google Scholar : https://bit.ly/3TmGbDi

Scribd : https://tinyurl.com/2p8nese9

DOI : https://doi.org/10.5281/zenodo.8133478

Abstract : Electro discharge machining (EDM) is a non- conventional machining process, in this process does not require any mechanical contact between the electrode and the workpiece. Usually, the dielectric fluids are used to create a connection to the electrode and the workpiece. Generally, fluids (kerosene, EDM oil, gasoline, deionized water, etc.) and gases (oxygen, helium, etc.) are used as dielectric in the EDM process, which serves as electrical insulators and semiconductor between electrode and workpiece. Also, the fluids remove the dust particles from the machining surfaces of the workpiece. However, the liquid medium is widely used in the EDM process. On the other hand, the gaseous dielectric is also often used to fill in any specific need. Nowadays, mixed dielectric fluids are very commonly used for machining purposes, because of some lack of efficiency with plane dielectric fluid. In this study, it is shown the advantages of several dielectric mediums (liquid and gas) in the EDM process for different materials. Furthermore, it also reviewed how to improve output parameters with respect to input parameters with the help of various types of mixed dielectric fluids.

Keywords : Electrical discharge machining, Dielectric fluids, Dielectric gases, Input parameters, Output parameters.

Electro discharge machining (EDM) is a non- conventional machining process, in this process does not require any mechanical contact between the electrode and the workpiece. Usually, the dielectric fluids are used to create a connection to the electrode and the workpiece. Generally, fluids (kerosene, EDM oil, gasoline, deionized water, etc.) and gases (oxygen, helium, etc.) are used as dielectric in the EDM process, which serves as electrical insulators and semiconductor between electrode and workpiece. Also, the fluids remove the dust particles from the machining surfaces of the workpiece. However, the liquid medium is widely used in the EDM process. On the other hand, the gaseous dielectric is also often used to fill in any specific need. Nowadays, mixed dielectric fluids are very commonly used for machining purposes, because of some lack of efficiency with plane dielectric fluid. In this study, it is shown the advantages of several dielectric mediums (liquid and gas) in the EDM process for different materials. Furthermore, it also reviewed how to improve output parameters with respect to input parameters with the help of various types of mixed dielectric fluids.

Keywords : Electrical discharge machining, Dielectric fluids, Dielectric gases, Input parameters, Output parameters.

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