Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Control of Processing Conditions for Improvement of vibration Characteristics of Injection Molded Disk

사출성형 디스크의 진동특성 향상을 위한 공정조건 제어

  • 신효철 (서울대학교 기계항공공학부) ;
  • 남지근 (서울대학교 기계항공공학부)
  • Published : 2006.06.01
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Abstract

Increased application of optical disks requires more improved dynamic stability of rotating disks. In this study, a new concept of controlling the processing conditions of injection molded disks was developed to improve vibration characteristics. The critical speed, which shows stiffness and dynamic stability of disk, is affected by the residual stress distribution; this varies as functions of distance from the gate and processing condition. The critical speed of disk was calculated with the initial stress taken into consideration, which was determined from injection molding simulation. Choosing melt temperature, mold temperature, filling speed and packing pressure as design parameters, critical speed is maximized with the method of response surface. It is shown that the stability of injection molded disk has been improved for the new condition obtained as a result of the study proposed.

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References

  1. Irons, J., 1988, 'Analysis of the Effect of Thickness and In-Plane Stress on Disc Vibration,' Journal of Sound and Vibration, Vol. 121, No. 3, pp. 481-495 https://doi.org/10.1016/S0022-460X(88)80371-7
  2. Ogden, R. W. and Roxburgh, D. G., 1993, 'The Effect of Pre-Stress on the Vibration and Stability of Elastic Disk,' International Journal of Engineering Science, Vol. 31, No. 12, pp. 1611-1639 https://doi.org/10.1016/0020-7225(93)90079-A
  3. Lamb, H. and Southwell, R. V., 1921, 'The Vibration of a Spinning Disk,' Proceedings of the Royal Society, Vol. 99, pp. 272-280 https://doi.org/10.1098/rspa.1921.0041
  4. Mote, C. D., 1965, 'Free Vibration of Initially Stressed Circular Disks,' Journal of Engineeringfor Industry, Vol. 89, pp. 258-265
  5. Mote, C. D. and Szymani, R., 'Circular Saw Vibration Research,' The Shock and Vibration Digest, Vol. 10, pp. 15-30 https://doi.org/10.1177/058310247801000604
  6. Dugdale, DS., 1966, 'Theory of Circular Saw Tensioning,' International Journal of Production Research, Vol. 4, pp. 237-248 https://doi.org/10.1080/00207546508919980
  7. Parker, R. G. and Mote, C. D., 1991, 'Tuning of the Natural Frequency Spectrum of a Circular Plate by in Plane Stress,' Journal of Sound and Vibration, Vol. 145, No.1. pp. 95-110 https://doi.org/10.1016/0022-460X(91)90608-M
  8. Renshaw, A. A., 1998, 'Increasing the Maximum Stable Rotation Speed of a Circular Disk Using Speed Dependent Clamping,' Journal of Sound and Vibration, Vol. 210, No. 4, pp. 431-439 https://doi.org/10.1006/jsvi.1997.0994
  9. Iwan, W. D. and Moeller, T. L., 1976, 'The Stability of a Spinning Elastic Disk with a Transverse Load Systems,' Journal of Applied Mechanics, Vol. 43, pp 485-490 https://doi.org/10.1115/1.3423896
  10. Adams, G. G., 1987, 'Critical Speeds for a Flexible Spinning Disk,' International Journal of Mechanics Science, Vol. 29, pp. 525-531 https://doi.org/10.1016/0020-7403(87)90024-5
  11. Renshaw, A. A., 1998, 'Critical Speed for Floppy Disks,' Transactions of the ASME, Vol. 65, pp. 116-120 https://doi.org/10.1115/1.2789013
  12. Kim, S. K., Park, S. J., 1999, 'Vibration Characteristics of a New Optical Disk (1): Injection Molding and Experiments of Initially Stressed Disks,' Proceedings of KSNVE, pp. 448-454
  13. Angela, D. and Daniel, V., 1999, Design and Analsis of Experiments, Springer-Verlag, New York
  14. G. Taguchi, 1987, System of Experimental Desing, White Plains
  15. Arfken, G., 1985, Mathematical Methods for Physicists $3^{rd}$ ed., Academic Press, San Diego, pp. 957-961
  16. Chung, J. T., Kang, N. C., Lee, J. M., 1996, 'A Study on Free Vibration of a Spinning Disk,' KSME Journal, Vol. 10, No. 2, pp. 138-145 https://doi.org/10.1007/BF02953653
  17. Isayev, A. I. and Hieber, C. A., 1980, 'Toward a Viscoelastic Modeling of the Injection Molding of Polymers,' Rheology of Acta, Vol. 19, pp. 168-182 https://doi.org/10.1007/BF01521928
  18. Shyu, G. D., Isayev, A. I., 1995, 'Residual Stresses and Birefringence in Injection Molded Disks,' SPE ANTEC Tech Papers, Vol. 14, pp. 2911-2917