TESTING OF A ROTARY HEAD FOR ULTRASONICALLY AIDED ELECTRICAL DISCHARGE MACHINING
Abstract
The paper deals with the testing of a rotary head for ultrasonically aided electrical discharge machining (EDM+US) that can be used at finishing and semifinishing modes and EDM with complex kinematics - “milling EDM”. The rotation movement using of the electrode-tool is justified by the fact that during the EDM process, the energy is dissipated over the machined surface, and thus its roughness is decreased. But this comes also with the higher instability of EDM process, often short-circuits between the tool and the workpiece, and the idle state due to the variable gap. The tool ultrasonic vibrations oriented perpendicular on the frontal machined surface confirmed both roughness and EDM stability improving, and consequently machining rate, at all working modes tested in this research. The curves of roughness and machining rate are presented at different values of tool rotation speed and consumed power on ultrasonic chain. The obtained surface microgeometry was also studied using scanning electron microscope.
References
2. Billa, S., Sundaram, M., Rajurkar K., A study on the high aspect ratio micro hole drilling using ultrasonic assisted micro-electro discharge machining, Journal of Materials Engineering and Performance 17 (2), pp. 210-215, (2008).
3. Yu, Z.Y., Zhang, Y., Li, J., Luan, J., Zhao, F., Guo, D., High aspect ratio micro-hole drilling aided with ultrasonic vibration and planetary movement of electrode by micro-EDM, CIRP Annals, Volume 58, Issue 1, pp. 213-216, (2009).
4. Ghoreishi, M., Atkinson, J., A comparative experimental study of machining characteristics in vibratory, rotary and vibro-rotary electro-discharge machining, Journal of Materials Processing Technology, 120, pp. 374-384 (2002).
5. Baseri, H., Sadeghian, S., Effects of nanopowder TiO2-mixed dielectric and rotary tool on EDM, Int. J. Adv. Manuf. Technol, 83, pp. 519–528, (2016).
6. Haldeev, V.N., The features of material transfer from the tool-electrode to the workpiece in dimensional EDM process at the relative movement of electrodes, Electronnaia Obrabotka Materialov, vol. 26, 4, 1990.
7. Anton, I., Cavitation, Vol. I and II, Romanian Academy Publising House, Bucharest, 1984.
8. Ghiculescu, D., Marinescu, N.I, Alupei – Cojocariu, O.D. Carutasu, L., Rotary head for ultrasonically aided electrical discharge machining, OSIM Patent request: A / 00528 / 23.07.2015.