Experimental Investigation of the Effect of EDM Debris Particles Mixed into the Dielectric Fluid on Tool Feed Rate in Drilling-EDM

Abstract:

In this paper the potential of the recirculation of the EDM debris particles of the workpiece material into the dielectric fluid to increase the tool feed rate v_f in drilling Electrical Discharge Machining (drilling-EDM) is experimentally investigated. Two-Channel electrodes made of copper (Cu) and brass (CuZn) in the range from 1.0 mm to 2.5 mm were used. The effect of the EDM debris particles in the dielectric fluid was investigated at a discharge current i_e of 25 A, a discharge duration t_e of 50 μs and a duty cycle of 80 % by comparing the EDM pulse characteristics and the feed rate v_f of the EDM process with and without debris particles added to the dielectric fluid (particle concentrations C1 = 2.5 g/l and C0 = 0 g/l, respectively). By the recirculation of EDM debris particles the feed rate could be increased up to 36 % depending on the machining conditions. Furthermore, it was observed that the increase in the feed rate is due to the increase of the percentage of discharge pulses and the decrease of short-circuit pulses as well as a more stable machining process.

• Periodical: Key Engineering Materials (Volume 926)
• Pages: 1696-1702
• DOI: https://doi.org/10.4028/p-2rg888
• Online since: July 2022
• Authors: Matthias Risto*, Uwe Wasmuth, Jan Kotschenreuther
• Keywords: Drilling-EDM, Feed Rate, Powder-Mixed-EDM

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