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A study on optimization of injection molding of large thick LH type elastic frame  

Lee, Sung-Hee (Department of Molding & Metal Forming R&D, Korea Institute of Industrial Technology)
Publication Information
Design & Manufacturing / v.16, no.1, 2022 , pp. 62-69 More about this Journal
Abstract
In the present study, the injection molding optimization of a large thick LH type elastic frames for the reduction of warpage was performed. Two kinds of fine and coarse finite element models were prepared to investigate the efficiency of analysis time and quality on simulation results. In order to derive injection molding conditions that can minimize distortion of parts, it was investigated that the effects of mold temperature, resin temperature, injection time, hold pressure switching time, holding pressure and the hold time on deformation characteristics using the design of experiments. The main influential factors on the warpage were found from the optimization simulation and the geometry data of the warpage result was converted into an initial model for injection simulation. It was shown that a coarse model with good mesh quality could be adapted for mold design since the total analysis time using the proposed model was reduced to 1/10. The suggested inversed warpage model produced the best minimized result of warpage.
Keywords
Injection molding; Optimization; Thick elastic frame; Warpage; Design of experiment; Surface response;
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1 M. C. Huang, C. C. Tai, "The effective factors in the warpage problem of an injection-molded part with a thin shell features", Journal of Materials Processing Technology, Vol. 110, pp. 1-9, 2001.   DOI
2 H. Kurtaran, B. Ozcelik, T. Erzurumlu, "Warpage optimization of a bus ceiling lamp bas using neural network model and genetic algorithm", Journal of Materials Processing Technology, Vol. 169, pp. 314-319, 2005.   DOI
3 T. Erzurumlu, B. Ozcelik, "Minimization of warpage and sink index in injection-molded thermoplastic parts using Taguchi optimization method", Materials and Design, Vol. 27, pp. 853-861, 2006.   DOI
4 S. Changyu, W. Lixia, L. Qian, "Optimization of injection molding process parameters using combination of artificial neural network and genetic algorithm method", Journal of Materials Processing Technology, Vol. 183, pp. 412-418, 2007.   DOI
5 B. Ozcelik, I. Sonat, "Warpage and structural analysis of thin shell plastic in the plastic injection molding", Materials and Design, Vol. 30, pp. 367-375, 2009.   DOI
6 C. P. Chen, M. T. Chuang, Y. H. Hsiao, Y. K. Yang, C. H. Tsai, "Simulation and experimental study in determining injection molding process parameters for thin-shell plastic parts via design of experiments analysis", Expert Systems with Applications, Vol. 36, pp. 10752-10759, 2009.   DOI
7 F. Yin, H. Mao, L. Hua, W. Guo, M. Shu, "Back Propagation neural network modeling for warpage prediction and optimization of plastic products during injection molding", Materials and Design, Vol. 32, pp. 1844-1850, 2011.   DOI
8 X. P. Dang, "General frameworks for optimization of plastic injection molding process parameters", Simulation Modeling Practice and Theory, Vol. 41, pp. 15-27, 2014.   DOI
9 Y. Q. Wang, J. G. Kim, J. I. Song, "Optimization of plastic injection molding process parameters for manufacturing a brake booster valve body", Materials and Design, Vol. 56, pp. 313-317, 2014.   DOI
10 C. C. Lee and J. M. Castro, "Fundamentals of Computer Modeling for Polymer Processing", Tucker III, C. L. (ed.), Hanser Publisher, New York, 1989.
11 K. H. Huebner and E. A. Thronton, "The finite element method for engineers", Chap. 4 & 5, John Wiley & Sons, New York, 1982.
12 A. I. lsayev and R. K. Upadhyay, "Injection and Compression Molding Fundamentals", Marcel Dekker Inc., New York, 1987.
13 H. Oktem, T. Erzurumlu, I. Uzman, "Application of Taguchi optimization technique in determining plastic injection molding process parameters for a thin-shell part", Materials and Design, Vol. 28, pp. 1271-1278, 2007.   DOI
14 Y. Gao, X. Wang, "Surrogate-based process optimization for reducing warpage in injection molding", Journal of Materials Processing Technology, Vol. 209, pp. 1302-1309, 2009.   DOI
15 E. Hakimian, A. B. Sulong, "Analysis of warpage and shrinkage properties of injection-molded micro gears polymer composites using numerical simulations assisted by Taguchi method", Materials and Design, Vol. 42, pp. 62-71, 2012.   DOI