Machining of External Cylindrical Surfaces on a RAM Electrical Discharge Machine

Abstract:

As other nonconventional machining methods, the electrical discharge machining is applied when the workpieces materials are difficult to be machined by classical machining methods or the surfaces could not be obtained in efficient conditions by classical machining methods. Such a situation could appear, for example, when test pieces must be separated from materials whose machining by classical methods is difficult. Taking into consideration the necessity to detach a cylindrical test piece from a workpiece made of a high resistance metallic alloy, the problem of using the electrical discharge machining was formulated. An initial experimental test by using the common work motion of the tool electrode from up to down highlighted high shape errors, due to the accumulation in the work zone of the particles detached from the workpiece and from the tool electrode, as a consequence of electrical discharge machining process. A second set of experiments were developed, placing the test piece over the electrode tool and ensuring a work motion of workpiece from up to down; in this situation, a diminishing of the shape error was noticed. The second set of experiments highlighted a relatively reduced conicalness of the machined surface and a low decrease of the machining speed. as the penetration depth of the tool electrode in the workpiece increases, too.

• Periodical: Key Engineering Materials (Volumes 554-557)
• Pages: 1800-1805
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.554-557.1800
• Online since: June 2013
• Authors: Laurenţiu Slătineanu, Margareta Coteaţă, Irina Besliu, Lorelei Gherman, Oana Dodun
• Keywords: Conicalness, Electrical Discharge Machining (EDM), External Cylindrical Surfaces, Machining Schema, Machining Speed

References

[1] C. Axinte, C. Munteanu, A. Barnea. Molybdenum coatings friction coefficient studies for future applications in machine elements: presented at The 5th International Conference on Advanced Concepts on Mechanical Engineering, 2012.

[2] E. Bud Guitrau. The EDM Handbook. Hanser Gardner Publications, Cincinnati, 1997.

[3] M. Kunieda, B. Lauwers, K. P. Rajurkar, B. M. Schumacher, Advancing EDM through fundamental insight into the process. CIRP Annals - Manufacturing Technology, 54 (2), (2005), 64–87.

DOI: 10.1016/s0007-8506(07)60020-1

[4] A. Nichici, V. Popovici, M. Nica, A. Achimescu, H. Popa, G. Paulescu. Machining by erosion in machine building (in Romanian), Facla Publishing House, Timişoara (Romania), 1983.

[5] L. Slătineanu, H.P. Schulze, O. Dodun, M. Coteaţă, L. Gherman, I. Grigoraş (Beşliu), Electrode tool wear at electrical discharge machining, Key Engineering Materials, vols. 504 – 506 (2012), 1189-1194.

DOI: 10.4028/www.scientific.net/kem.504-506.1189

[6] C. Sommer, C. Non-Traditional Machining Handbook, Advance Publishing, Inc., Houston, 2000.