In many research papers, they mention that the experiments have been carried out under Single Discharge condition. Can anyone give detailed explanation regarding this concept?
Generally in EDM the discharges will be continuous and overlapping each other, thereby making the study of the effect of discharge on the quality of EDM difficult. Whereas in Single discharge EDM there will be a single crater for each discharge which will allow for proper study of the exact surface characterization. Here are a few references specific on the subject for further studies:
Erden, A. (1983). Effect of materials on the mechanism of electric discharge machining (EDM). Journal of Engineering Materials and Technology, 105(2),
132-138.
Wong, Y. S., Rahman, M., Lim, H. S., Han, H., & Ravi, N. (2003). Investigation of micro-EDM material removal characteristics using single< i> RC-pulse discharges. Journal of Materials Processing Technology, 140(1), 303-307.
Mohd Abbas, N., Solomon, D. G., & Fuad Bahari, M. (2007). A review on current research trends in electrical discharge machining (EDM). International Journal of Machine Tools and Manufacture, 47(7), 1214-1228.
Generally, in various places the sparks are carried out simultaneously, and thus clear effect and shape of the craters are difficult to analyse on those surfaces. To see the clear picture and the effect generally multi-sparking results provide misleading result. therefore for simplify the analysis researcher go for single spark experiments.
Thank you Sirs for your valuable inputs.
Does it mean that to carryout single discharge experiments, one need to change the basic circuit of the EDM machine?
Either in the circuit of setup or in the experimental set up so that after on spark cut off take pace.
Vishal
Special circuit needs to be developed for the purpose. Few details are available in references that I gave in the previous answer.
Alternatively using high speed camera with conventional systems can resolve individual crater formed by analyzing the film.
"The high speed framing camera (HSFC) permits temporal resolutions of the discharge from 5 to 200 ns what is necessary for an analysis of the discharging processes. These very short exposure times are necessary because the current rise times and the breakdown times of the voltage are in the range from 100 to 200 ns."
See - http://www.henrik-juhr.de/lit/Comparison%20of%20measured%20and%20simulated%20crater.pdf
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