Comparison of Conventional and Dry Electrical Discharge Machining

Abstract:

For manufacturing of micro holes ElectricalDischarge Machining (EDM) can be used, which is well-established due toits thermal working principle that allows almost force free machining independent of the material’s mechanical properties. The importance of this production technology is increasing, especially for the machining of ceramic materials, which are required in many applications within the field of microtechnology. However, the production of precise micro holes with complex geometries and high aspect ratios is associated with a many challenges. Hightool electrode wear, low material removal rate and small gap widths are observed in the process. This paper presents an optimized dry EDM technology for the manufacturing of micro holes in Si₃N₄-TiNceramic. The experiments were carried out with different energy influencing process parameters for the spark discharge and flushing pressure, which were systematically evaluated by methods of statistical Design of Experiments. Subsequently dry EDM and conventional EDM micro drilling processes were compared and the differences between both processes were evaluated. The influences of liquid and gaseous dielectric are analyzed in terms of process stability and axis movements.

• Periodical: Applied Mechanics and Materials (Volume 794)
• Pages: 278-284
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.794.278
• Online since: October 2015
• Authors: Tassilo Maria Schimmelpfennig*, Ivan Perfilov, Jan Streckenbach, Eckart Uhlmann
• Keywords: Dry-EDM, Electrical Discharge Machining, Process

References

[1] Kunieda, M. et al.: Electrical Discharge Machining in Gas. CIRP Annals – Manufacturing Technology 46 (1997) 1, p.143 – 146.

DOI: 10.1016/s0007-8506(07)60794-x

[2] Kao, C. C et al.: Near dry electrical discharge machining. International Journal of Machine Tools and Manufacture 47 (2007) 15, p.2273 – 2281.

DOI: 10.1016/j.ijmachtools.2007.06.001

[3] Kunieda, M.; Furudate, C.: High Precision Finish Cutting by Dry WEDM. CIRP Annals – Manufacturing Technology 50 (2001) 1, p.121 – 124.

DOI: 10.1016/s0007-8506(07)62085-x

[4] Yu, Z. B. et al.: Dry Electrica Discharge Machining of Cemented Carbide, J. Materials Processing Technology, (2004) 149, p.353 – 357.

DOI: 10.1016/j.jmatprotec.2003.10.044

[5] Klein, B.: Versuchsplanung – DoE: Einführung in die Taguchi/Shainin-Methodik. München, Oldenbourg, (2007).

DOI: 10.1524/9783110343847

[6] Langmack, M.: Laserwendel- und funkenerosives Mikrobohren. Dissertation, TU-Berlin, (2015).

[7] Oelheld GmbH: Wissenswertes zur Senkerosion. Stuttgart. Company paper, (2014).

[8] Kuo, J. -L. et al.: Ringing Effect Analysis of the Digital Current Pulse Generator for the Linear Rail Gun. IEEE Industry Applications Society Annual Meeting 1 (2002), p.176–181.

DOI: 10.1109/ias.2002.1044084