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

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
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Influence of Injection Molding Conditions on the Birefringence of Disks

사출성형 조건이 디스크의 복굴절에 미치는 영향

  • 이호상 (충주대학교 항공기계설계학과) ;
  • 박민규 (충주대학교 항공기계설계학과 산업대학원)
  • Received : 2010.07.27
  • Accepted : 2010.10.07
  • Published : 2010.10.30
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Abstract

A computer code was developed to simulate all three stages of the injection molding process: filling, packing and cooling by finite element method. The constitutive equation used here was compressible Leonov model. The PVT relationship was assumed to follow the Tait equation. The flow-induced birefringence was related to the calculated flow stresses through the linear stress-optical law. Based on the simulation, the Taguchi method was used to investigate the influences of injection molding conditions on the birefringence of a center gate disk. In addition, the optimal processing conditions were selected to minimize the birefringence and the birefringence difference along the positions of the disk.

Keywords

References

  1. Isayev, A. I. and Hieber, C. A., "Toward a viscoelastic modeling of the injection molding of polymers," Rheol. Acta, Vol. 19, pp. 168-182, 1980. https://doi.org/10.1007/BF01521928
  2. Isayev, A. I., "Orientation Development in the Injection Molding of Amorphous Polymers," Polym. Eng. Sci, Vol. 23, pp. 271-284, 1983. https://doi.org/10.1002/pen.760230507
  3. Wimbereger-Friedl R., "Assessment of orientation, stress and density distributions in injection-molded amorphous polymers by optical techniques," Prog. Polym. Sci, Vol. 20, pp. 369-401, 1995. https://doi.org/10.1016/0079-6700(94)00036-2
  4. Kim, I. H., Park, S. J., Chung, S. T. and Kwon, T. H., "Numerical Modeling of Injection/ Compression Molding for Center-Gated Disk Part 1: Injection Molding With Viscoelastic Compressible Fluid Model," Polym. Eng. Sci, Vol. 39, pp. 1930-1942, 1999. https://doi.org/10.1002/pen.11586
  5. Lee, Y. B., Kwon, T. H and Yoon, K., "Numerical Prediction of Residual Stresses and Birefringence in Injection/Compression Molded Center-Gated Disk. Part 1: Basic Modeling and Results for Injection Molding," Polym. Eng. Sci, Vol. 42, pp. 2246-2272, 2002. https://doi.org/10.1002/pen.11114
  6. Shyu, G. D., "Birefringence and Residual Stresses in Molded Articles of Amorphous Polymers," Ph.D. Dissertation, The University of Akron, 1993.
  7. Shyu, G. D. and Isayev, A. I., "Residual Stresses and Birefringence in Injection Molded Disks," SPE ANTEC Tech Papers, Vol. 41, pp. 2911-2917, 1995.
  8. Shyu, G. D., Isayev, A. I. and Lee, H. S., "Numerical simulation of flow-induced birefringence in injection molded disk," Korea-Australia Rheology J, Vol. 15, pp. 159-166, 2003.
  9. Yoon, K., "An Experimental Study on Precision Injection Molding of Center-gated Disks", Korean J. of Rheol. Vol. 7, pp. 19-27, 1995.