Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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Electrochemical Machining Using Tungsten Microelectrode

텅스텐 미세 전극을 이용한 전해 가공

  • Ryu, Shi-Hyoung (Department of Mechanical Engineering, Chonbuk National Univ.) ;
  • Yu, Jong-Sun (Department of Mechanical Engineering, Chonbuk National Univ.)
  • 류시형 (전북대학교 기계공학과) ;
  • 유종선 (전북대학교 기계공학과)
  • Published : 2009.04.01
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Abstract

The feasibility of electrochemical drilling and milling on stainless steel are investigated using tungsten microelectrode with $10{\mu}m$ in diameter. For the development of environmentally friendly and safe electrochemical process, citric acid solution is used as electrolyte. A few hundred nanoseconds duration pulses are applied between the microelectrode and work material for dissolution localization. Tool fracture by Joule heating, micro welding, capillary phenomenon, tool wandering by the generated bubbles are observed and their effects on micro ECM are discussed. Occasionally, complex textures including micro pitting corrosion marks appeared on the hole inner surface. Metal growth is also observed under the weak electric conditions and it hinders further dissolutions for workpiece penetration. By adjusting appropriate pulse and chemical conditions, micro holes of $37{\mu}m$ in diameter with $100{\mu}m$ in depth and 26Jim in diameter with $50{\mu}m$ in depth are drilled on stainless steel 304. Also, micro grooves with $18{\mu}m$ width and complex micro hand pattern are machined by electrochemical milling.

Keywords

References

  1. Schuster, R., Kirchiner, V., Allongue, P. and Etrl, G., "Electrochemical Micromachining," Science, Vol. 289, No. 5476, pp. 98-101, 2000 https://doi.org/10.1126/science.289.5476.98
  2. Kirchiner, V., Cagnon, L., Schuster, R. and Etrl, G., "Electrochemical Machining of Stainless Steel Microelements with Ultrashort Voltage Pulses," Applied Physics Letters, Vol. 79, Issue 11, pp. 1721-1723, 2001 https://doi.org/10.1063/1.1401783
  3. Rajurkar, K. P., Levy, G., Malshe, A., Sundaram, M. M., McGeough, J., Hu, X., Resnick, R. and DeSilva, A., "Micro and Nano Machining by Electro-Physical and Chemical Processes," Annals of the CIRP, Vol. 55, Issue 2, pp. 643-666, 2006 https://doi.org/10.1016/j.cirp.2006.10.002
  4. Ahn, S. H., Ryu, S. H., Choi, D. K. and Chu, C. N., "Localized Electro-chemical Micro Drilling Using Ultra Short Pulses," Journal of the Korean Society of Precision Engineering, Vol. 20, No. 8, pp. 213-220, 2003
  5. Kim, B. H., "Taper Reduction by Disk-type Electrode in Micro Electrochemical Machining," Ph. D. dissertation of Mechanical Engineering on Seoul National University, 2005
  6. Park, M. S., "Micro Electrochemical Machining Using Multiple Tool Electrodes," Ph. D. dissertation of Mechanical Engineering on Seoul National University, 2007
  7. Ryu, S. H., "Micro Electrochemical Machining of Stainless Steel Using Citric Acid," Journal of the Korean Society of Precision Engineering, Vol. 25, No. 3, pp. 134-140, 2008
  8. Lambrou, P. S., Christou, S. Y., Fotopoulos, A. P., Foti, F. K., Angelidis, T. N. and Efstathiou, A. M., "The Effects of the Use of Weak Organic Acids on the Improvement of Oxygen Storage and Release Properties of Aged Commercial Three-way Catalysts," Applied Catalysis B: Environmental, Vol. 59, Issues 1-2, pp. 1-11, 2005 https://doi.org/10.1016/j.apcatb.2004.12.012
  9. Zelenin, O. Y., "Interaction of the $Ni^{2+}$ Ion with Citric Acid in an Aqueous Solution," Russian Journal of Coordination Chemistry, Vol. 33, No. 5, pp 346-350, 2007 https://doi.org/10.1134/S1070328407050065
  10. Chu, C. M. and Wan, C. C., "Effect of Citric Acid as a Chelating Agent on Anodic Behaviour of Pure Iron with Potentiostatic and Cyclic Voltammetry Methods," Materials Chemistry and Physics, Vol. 33, Issues 3-4, pp. 189-196, 1993 https://doi.org/10.1016/0254-0584(93)90061-P
  11. Li, L. F., Caenen, P. and Celis, J. P., "Effect of Hydrochloric Acid on Pickling of Hot-rolled 304 Stainless Steel in Iron Chloride Based Electrolytes," Corrosion Science, Vol. 50, Issue 3, pp. 804-810, 2008 https://doi.org/10.1016/j.corsci.2007.09.006
  12. Choi, J. S., Lee, J. K., Lim, J. H. and Kim, S. J., "Technology Trends in Fabrication of Nanostructures of Metal Oxides by Anodization and Their Applications," Journal of the Korean Industrial and Engineering Chemistry, Vol. 19, No. 3, pp. 249-258, 2008