Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
권호 표지

Development of machining technology for non-continuous pattern removing plastic deformation around pattern

패턴 주변의 소성변형현상을 제거한 고품위 불연속패턴 가공기술 개발

  • 전은채 (한국기계연구원 나노공정장비연구실) ;
  • 제태진 (한국기계연구원 나노공정장비연구실) ;
  • 장성환 (한국기계연구원 나노공정장비연구실)
  • Received : 2010.09.14
  • Accepted : 2010.11.18
  • Published : 2010.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

Patterned optical components are widely used for optical products such as LCD and lighting. Since CCFL was used as a light source in the products, prism films having linear continuous optical patterns were widely used. However, LED which is a dot light source is popular recently, therefore, the optical products need new optical components having non-continuous optical patterns. Indentation machining method is a powerful method for machining of non-continuous pattern. When a copper mold and a brass mold were machined by this method, severe plastic deformation called pile-up was observed around the patterns. Since pile-up has negative relationship to ductility, this deformation can be eliminated by annealing treatment which makes the materials ductile. No plastic deformation occurred when machined after annealing at $600{^{\circ}C}$ and $575{^{\circ}C}$ for copper and brass, respectively. Finally, non-continuous optical patterns with high quality were machined on a copper mold and a brass mold successively.

Keywords

References

  1. Kim S. W. et al. "Micropatterns of W-Cu Composites Fabricated by Metal Powder Injection Molding," Metals and materials international, Vol.13 pp. 391-395, 2007. https://doi.org/10.1007/BF03027873
  2. Je T. J. et al. "Machining Technology of Micro Prism Array Using Planner Cutting Process," Proc. of the KSMPE Spring Conf. pp. 191-194, 2009.
  3. Akihiro F., Shigeru A. "LED backlight system with double-prism pattern," J. Soc. Inf. Display, Vol. 14 pp. 1045-1051, 2006. https://doi.org/10.1889/1.2393029
  4. Baker K. M. "Highly Corrected Close-packed Microlens Arrays and Moth-eye Structuring on Curved Surfaces," Applied Optics, Vol. 38 pp. 352-356, 1999. https://doi.org/10.1364/AO.38.000352
  5. Oliver W. C., Pharr G. M. "An Improved Technique for Determining Hardness and Elastic Modulus Using Load and Displacement Sensing Indentation Experiments," J. Mater. Res., Vol. 7 pp. 1564-1583, 1992. https://doi.org/10.1557/JMR.1992.1564
  6. Jeon E. c., Kim J. Y., Baik M. K., Kim S. H., Park J. S. Kwon D. "Optimum Definition of True Strain Beneath a Spherical Indenter for Deriving Indentation Flow Curves," Mat. Sci. and Eng. A, Vol. 419 pp. 196-201, 2006. https://doi.org/10.1016/j.msea.2005.12.012
  7. KS B 0805, "브리넬 경도 시험 방법", 한국표준협회, 2005.
  8. KS B 0811, "금속재료의 비커스 경도시험방법", 한국표준협회, 2008.
  9. Dieter, G. E., "Mechanical Metallurgy," McGraw Hill, 1988.
  10. Cheng Y. T., Cheng C. M. "Effects of 'Sinking in' and 'Piling up' on Estimating the Contact Area Under Load in Indentation," Phil. Mag. Let., Vol. 78 pp. 115-120, 1998. https://doi.org/10.1080/13642819808202933