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

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

Prediction of State of Cutting Surfaces of Polymers by Analysis of Indentation Load-depth Curve

압입하중-변위곡선 분석을 통한 폴리머 소재의 절삭표면상태 예측에 관한 연구

  • 전은채 (한국기계연구원 나노공정장비연구실) ;
  • 김재현 (한국기계연구원 나노역학연구실) ;
  • 제태진 (한국기계연구원 나노공정장비연구실)
  • Received : 2011.04.24
  • Accepted : 2011.08.08
  • Published : 2011.08.31
Download PDF
⟨ Previous Next ⟩

Abstract

UV imprinting process can manufacture high-functional optical components with low cost. If hard polymers can be used as transparent molds at this process, the cost will be much lower. However, there are limited researches to predict the machinability and the burr of hard polymers. Therefore, a new method to predict them by analyzing load-depth curves which can be obtained by the instrumented indentation test was developed in this study. The load-depth curve contains elastic deformation and plastic deformation simultaneously. The ratio of the plastic deformation over the sum of the two deformation is proportional to the ductility of materials which is one of the parameters of the machinability and the burr. The instrumented indentation tests were performed on the transparent molds of the hard polymers and the values of ratio were calculated. The machinability and the burr of three kinds of hard polymers were predicted by the ratio, and the prediction was in agreement with the experimental results from the machined surfaces of the three kinds of hard polymers.

Keywords

References

  1. Choi H. J. et al. "Analysis of Machining Characteristics for Micro Pattern of Transparent Polymer Panel using Diamond Cutting Tool and its Application", Proc. of the KSMPE Spring Conf., pp. 45-46, 2010.
  2. 서남섭, "절삭가공학", 동명사 pp. 160, 2010.
  3. Dieter, G. E., "Mechanical Metallurgy", McGraw Hill, pp. 290, 1988.
  4. 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
  5. 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
  6. Filiz S., Conley C. M., Wasserman M. B., Ozdoanlar O. B. "An experimental investigation of micro-machinability of copper 101 using tungsten carbide micro-endmills", Machine Tools and Manufacture, Vol. 47, pp. 1088-1100, 2007. https://doi.org/10.1016/j.ijmachtools.2006.09.024
  7. Yuan Z. J., Zhou M., Dong S. "Effect of diamond tool sharpness on minimum cutting thickness and cutting surface integrity in ultraprecision machining", J. Mater. Proc. Tech., Vol. 62, pp. 327-330, 1996. https://doi.org/10.1016/S0924-0136(96)02429-6
  8. Boschetto A., Quadrini F. Squeo E. A. "Extracting local mechanical properties of steel bars by means of instrumented flat indentation", Measurement, Vol. 44, pp. 129-138, 2011. https://doi.org/10.1016/j.measurement.2010.09.038
  9. KS B 0950, "금속 재료의 계장화 압입 시험 - 압입인장 물성 평가", 한국표준협회, 2008.
  10. Sakai M. "Energy Principle of the Indentation-induced Inelastic Surface Deformation and Hardness of Brittle Materials," Acta Metallurgica et Materialia, Vol. 41, pp. 1751-1758, 1993. https://doi.org/10.1016/0956-7151(93)90194-W