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

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

DOI QR Code

Effect of Flow Pattern of Coolant for Injection Mold on the Deformation of Injection Molding

사출금형 냉각수의 유동 패턴이 사출성형품의 변형에 미치는 영향

  • Choi, Kye-Kwang (Department of Metalmold Design Engineering, Kongju National University) ;
  • Hong, Seok-Moo (Department of Metalmold Design Engineering, Kongju National University) ;
  • Han, Seong-Ryeol (Department of Metalmold Design Engineering, Kongju National University)
  • 최계광 (국립공주대학교 금형설계공학과) ;
  • 홍석무 (국립공주대학교 금형설계공학과) ;
  • 한성렬 (국립공주대학교 금형설계공학과)
  • Received : 2015.05.11
  • Accepted : 2015.06.18
  • Published : 2015.08.31
Download PDF
⟨ Previous Next ⟩

Abstract

The deformation of injection molding is seriously affected by injection molding conditions, such as melt and mold temperature and injection and holding pressure. In these conditions, the mold temperature is controlled by flowing coolant, which can be classified by the Reynolds number in the mold-cooling channel. In this study, the deformation of the automotive side molding according to the variation of the Reynolds number in the coolant was simulated by Moldflow. In the results, as the Reynolds number was increased, the mold cooling was also increased. However, when the Reynolds number exceeded a certain range, the mold cooling was not increased further. In addition to the Moldflow verification, the mold cooling by the coolant was simulated by CFX. The CFX results confirmed that the Reynolds number significantly influenced the mold cooling. The coolant, which has a high Reynolds number value, quickly cooled the mold. However, the coolant, which has a low Reynolds number value, such as 0 points, hardly cooled the mold. In an injection molding experiment, as the Reynolds number was high, the deformation of the moldings was reduced. The declining tendency of the deformation was similar to the Moldflow results.

Keywords

References

  1. Han, S. R., "The Relation Between Injection Molding Conditions and Gloss of ABS Molding," Journal of the Korea Academia-Industrial Cooperation Society, Vol. 14, No. 11, pp. 5352-5356, 2013. https://doi.org/10.5762/KAIS.2013.14.11.5352
  2. Chen, H. L., Chen, S. C, Liao, W. H, Chien, R. D. and Lin, Y. T., "Effects of Insert Film on Asymmetric Mold Temperature and Associated Part Warpage During In-mold Decoration Injection Molding of PP Parts," International Communications in Heat and Mass Transfer, Vol. 41, pp. 34-40, 2013. https://doi.org/10.1016/j.icheatmasstransfer.2012.11.002
  3. Kwon, J. H., Rhee, B. O., Choi, J. H., Cho, M. S., Lee, J. H. and Tae, J. S., "A Cae Analysis for the Effect of Mold Temperature on Ultra-Thin Wall Injection Molding," Proc. of KSPE 2014 Spring Conference, pp. 496, May, 2014.
  4. Sohn, D. H. and Park, K., "Investigation of Cooling Performance of Injection Molds Using Pulsed Mold Temperature Control," Trans. Korean Soc. Mech. Eng. B, Vol. 37, No. 1, pp. 35-41, 2013. https://doi.org/10.3795/KSME-B.2013.37.1.035
  5. Cengel, Y. A., "Heat Transfer: a Practical Approch - 2nd edition," McGraw-Hill Korea, pp. 394-410, 2006.
  6. Menges, G., Michaeli, W. and Mohren, P., "How to Make Injection Molds," Hanser, pp. 300-302, 2000.
  7. Beaumont, J. P., "Runner and Gating Design Handbook," Hanser, pp. 5-6, 2004.
  8. Menning, G. and Stoeckhert, K. "Mold-Making Handbook - 3rd edition," Hanser, pp. 383-385, 2013.
  9. Lee, S. K. and Kim, S. H., "Experimental Study on Implementation of Injection Molding Process for Speaker Frame in LED TV," J. of KSMPE, Vol. 12, No. 5, pp. 94-101, 2013.
  10. Liu, Y. and Gehde, M., "Evaluation of Heat Transfer Coefficient Between Polymer and Cavity Wall for Improving Cooling and Crystallinity Results in Injection Molding simulation," Applied Thermal Engineering, Vol. 80, No. 5, pp. 238-246, 2015. https://doi.org/10.1016/j.applthermaleng.2015.01.064
  11. Strong, A. B., "Plastics: Materials and Processing," Prentice-Hall, pp. 166-169, 1996.
  12. Kim, D. K. and Kim, S. K., "A Study on Design of Nozzle Tip for Airless Spray Coating," J. of KSMPE, Vol. 11, No. 6, pp. 183-188, 2012.
  13. Shin, N. H., Oh, H. S. and Kang. S. K., "The Optimization of Injection Molding Process by CAE," Dea Kawng Seo Rim Pub, pp. 146-148, 2007.

Cited by

  1. Numerical Analysis of Cooling Channels for Injection Molding Cycle Time Improvement of Plastic Horn Cover for an Automobile vol.17, pp.5, 2018, https://doi.org/10.14775/ksmpe.2018.17.5.084
  2. Reduction of Birefringence and Weld-Line using Over-Flow in Injection Compression Molding for Optic Lens vol.17, pp.1, 2018, https://doi.org/10.14775/ksmpe.2018.17.1.095
  3. Flow Analysis due to the Slant Angle of a Windscreen at the Front of a Car Body vol.19, pp.9, 2015, https://doi.org/10.14775/ksmpe.2020.19.09.009
  4. Analysis of Airflow due to the Configuration of Automotive Diffuser vol.19, pp.11, 2015, https://doi.org/10.14775/ksmpe.2020.19.11.016
  5. 경비행기 프로펠러의 공기 유동해석에 관한 융합 연구 vol.11, pp.12, 2015, https://doi.org/10.15207/jkcs.2020.11.12.131