Journal of the Korean Society of Manufacturing Technology Engineers (한국생산제조학회지)

The Korean Society of Manufacturing Technology Engineers (한국생산제조학회)
권호 표지
DOI QR코드

DOI QR Code

A Study on Processing Shape and Overcutting of Invar Sheet by Pulse Electrochemical Machining

펄스전해가공을 이용한 인바 박판의 가공 형상 및 Overcutting 현상에 관한 연구

  • Published : 2015.06.15
Download PDF
⟨ Previous Next ⟩

Abstract

Invar is a compound metal of Fe-Ni system contained 36.5% Ni. The characteristic of invar is that the coefficient of thermal expansion is $1.0{\times}10^{-6}cm/^{\circ}C$. It is approximately 10 times smaller than series of steel. Because of this low thermal expansion characteristic of Invar, it is used to shadow mask of display device such as UHDTV or OLED TV. In this study, pulse current from pulse generator instead of DC current is used to overcome the disadvantages of the conventional electrochemical machining. Pulsed current with different duty factor in PECM affect the precise geometry. Pulse electrochemical machining is conducted to machine the micro hole to the invar sheet with different duty factor. The machined shape and overcut of invar sheet with different duty factor is observed by optical microscope and scanning electron microscope (SEM).

Keywords

References

  1. Inaba, M., Techima, K., Higashinakagawa, E., Ohtake, Y., 1988, Development of an Invar Shadow Mask for Color Cathode Ray Tubes, Wiley, New York.
  2. Kim S. H, Choi S. G, Choi W.K,Yang B. Y, Lee E. S., 2014, Pulse electrochemical machining on Invar alloy : Optical microscopic/SEM and non-contact 3D measurement study of surface analyses, Applied surface science, 314:30, 822-831. https://doi.org/10.1016/j.apsusc.2014.07.028
  3. Won, S. T., 2001, The effects of the annealing heat treatments on the mechanical properties of the Invar materials, Journal of the Korean Society of Precision Engineering, 18, 129-138.
  4. Grimmentt, D., Schwartz, M., Nobe, K., 1993, A comparison of DC and pulsed Fe-Ni alloy deposits, Journal of the Electrochemical Society, 140, 973-978. https://doi.org/10.1149/1.2056238
  5. Schuster, R., Krchiner, V., Allongue, P., Etrl, G., 2000, Electrochemical Micromachining, Science, 289, 98-101. https://doi.org/10.1126/science.289.5476.98
  6. Lee, E. S., Park, J. W., Moon, Y. H, 2003, Machining of Micro Grooves using Hybrid Electrochemical Processes with Voltage Pulses, Journal of the Korean Society of Precision Engineering, 20(9), 32-39.
  7. Kim S. H., Choi S. G., Choi W. G., Baek, S. Y.,Yang B.Y., Lee E.S., 2014, Analysis of Surface Profile using Pulse Electro Chemical Machining, The Korean Society of Manufacturing Technology Engineers Autumn Conference 2014, 234.
  8. Cho C. E., Baek S. Y., Lee E. S,, 2003, A study of electrochemical micromachining with voltage pulses, The Korean Society of Manufacturing Technology Engineers Conference 2003, 356-361.
  9. Park, J. W., Lee, E. S., Moon, Y. H., 2002, A Study on the Electrochemical Micro-machining for Fabrication of Micro Grooves, Journal of the Korean Society of Precision Engineering, 19(4), 101-108.
  10. Kim, W. M., Baek, S. Y., Lee, E. S., Tak, Y. S., 2004, A study of Pulse EMM for Invar alloy, KSPE Autumn Conference, 70-73.
  11. Fan. Z. W., Hourng, L. W., Wang, C.Y., 2010, Fabrication of tungsten microelectrodes using pulsed electrochemical machining, Precision Engineering, 34, 489-496. https://doi.org/10.1016/j.precisioneng.2010.01.001
  12. Ahn, S. H., Ryu, S. H., Choi, D. K.,Chu, C. N., 2003, Localized Electro-chemical Micro Drilling Using Ultra Short Pulses, Journal of the Korean Society of Precision Engineering, 20(8), 213-220.