Future Directions of Electric Discharge Drilling on Composites: A Review

Electrical Discharge Drilling (EDD) is an efficient shaping technique that makes a variety of holes in hard materials that are challenging to drill. The current endeavor is to find the different factors to enhance the material removal rate (MRR) and decrease the tool wear rate (TWR), save the drilling time and energy, and reduce the holes to expand for the EDD process. A common non-contacting hybrid machining technique for electrically conductive materials is EDD, which finds application in nuclear power plants, automobiles, aircraft, and other construction sectors. It generates extremely high temperatures that vaporize the work material on the workpiece’s surface using a high discharge voltage supply. Composite materials are now widely employed in sophisticated engineering processes. Owing to their anisotropic and non-homogeneous character, machining them presents significant challenges for these industries. The aim of this article is to focus the inquiry on the fundamental physical notion of the EDD process and analyze the experimental work of earlier researchers in tabular form. This research also reports on how input parameters affect machining characteristics and illustrates the EDD process variables using a block diagram. The scopes of the resources and research potential have been analytically represented using a pie chart based on the critical examination of the literature.