DOI QR코드

DOI QR Code

Study molded part quality of plastic injection process by melt viscosity evaluation

  • Lin, Chung-Chih (Department of Mechanical and Computer-Aided Engineering, National Formosa University) ;
  • Wu, Chieh-Liang (Department of Mechanical and Computer-Aided Engineering, National Formosa University)
  • 투고 : 2014.05.13
  • 심사 : 2014.07.02
  • 발행 : 2014.06.25

초록

A study that demonstrates how to investigate the molded part quality and the consistency of injection process based on the rheological concept is proposed. It is important for plastic material whose melt viscosity is variable with respect to the processing condition. The formulations to couple the melt viscosity with injection pressure and fill time are derived first. Taking calculations of the measured pressure and the time by using these formulations, the melt viscosity in injection process can be determined on machine. As the relation between the injection speed and the melt viscosity is constructed, the influences of the setting parameter of injection machine on the molded part quality can be investigated through evaluating the state of the melt viscosity. In addition, a pressure sensor bushing (PSB) designed with a quick installation feature is also provided and validated. The results show that a higher injection speed improves the tensile strength of the molded part but also the consistency of the molded part quality. This work provides an alternative to evaluate the molding quality scientifically.

키워드

과제정보

연구 과제 주관 기관 : National Science Council

참고문헌

  1. Beaumont, J.P. (2007), Runner and Gating Design Handbook: Tools for Successful Injection Molding. 2nd Edition, Hanser, Ohio, USA.
  2. Bird, R.B. and Hassager, O. (1987), Dynamics of Polymeric Liquids, Volume 1 Fluid Mechanics, 2nd Edition, Wiley, New York, NY, USA.
  3. Dlugas, D.M. and Kountz, A.E. (2011), "Investigation of differing approaches to determine an optimum injection velocity during mold filling", ANTEC conference, USA, 1627-1635.
  4. Gao, R. X. Tang, X. Gordon, G. and Kazmer, D. (2014), "Online product quality monitoring through in-process measurement", CIRP Annals- Manufacturing Technology, in press.
  5. Kurt, M., Kamber, O.S., Kaynak, Y., Atakok, G. and Girit, O. (2009), "Experimental investigation of plastic injection molding: Assessment of the effects of cavity pressure and mold temperature on the quality of the final products", Mater. Des., 113, 3217-3224.
  6. Lee,S.H. Kim,S.Y., Youn, J.R. and Kim, B.J. (2010), "Warpage of a large-sized orthogonal stiffened plate produced by injection molding and injection compression molding", J. Appl. Polymer Sci.,116, 3460-3467.
  7. Lin, C.C. (2012), "Influence of injection velocity on quality of insert molding", Polymer Eng. Sci., 52, 268-276. https://doi.org/10.1002/pen.22080
  8. Mertes, S., Carlson, C., Bozzelli, J., Groleau, M. (2001), "What position on the viscosity curve is the most repeatable with respect to end of fill cavity PSI", ANTEC conference, USA, 620-624.
  9. Ozcelika, B.,Ozbaya, A., and Demirbas, E.(2010),"Influence of injection parameters and mold materials on mechanical properties of ABS in plastic injection molding", Heat Mass Transfer, 37,1359-1365. https://doi.org/10.1016/j.icheatmasstransfer.2010.07.001
  10. Potch, G. and Michaeli, W. (1995), Injection Molding: an Introduction. Hanser, New York, NY, USA.