Frontiers of Mechanical Engineering >
Three-dimensional numerical simulation for plastic injection-compression molding
Received date: 29 Apr 2017
Accepted date: 02 Sep 2017
Published date: 23 Jan 2018
Copyright
Compared with conventional injection molding, injection-compression molding can mold optical parts with higher precision and lower flow residual stress. However, the melt flow process in a closed cavity becomes more complex because of the moving cavity boundary during compression and the nonlinear problems caused by non-Newtonian polymer melt. In this study, a 3D simulation method was developed for injection-compression molding. In this method, arbitrary Lagrangian-Eulerian was introduced to model the moving-boundary flow problem in the compression stage. The non-Newtonian characteristics and compressibility of the polymer melt were considered. The melt flow and pressure distribution in the cavity were investigated by using the proposed simulation method and compared with those of injection molding. Results reveal that the fountain flow effect becomes significant when the cavity thickness increases during compression. The back flow also plays an important role in the flow pattern and redistribution of cavity pressure. The discrepancy in pressures at different points along the flow path is complicated rather than monotonically decreased in injection molding.
Yun ZHANG , Wenjie YU , Junjie LIANG , Jianlin LANG , Dequn LI . Three-dimensional numerical simulation for plastic injection-compression molding[J]. Frontiers of Mechanical Engineering, 2018 , 13(1) : 74 -84 . DOI: 10.1007/s11465-018-0490-1
1 |
Kuo H C, Jeng M C. The influence of injection molding and injection compression molding on ultra-high molecular weight polyethylene polymer microfabrication. International Polymer Processing, 2011, 26(5): 508–516
|
2 |
Huang M S, Chung C F. Injection molding and injection compression molding of thin-walled light-guided plates with V-grooved microfeatures. Journal of Applied Polymer Science, 2011, 121(2): 1151–1159
|
3 |
Guan W S, Huang H X. Back melt flow in injection-compression molding: Effect on part thickness distribution. International Communications in Heat and Mass Transfer, 2012, 39(6): 792–797
|
4 |
Young W B. On the residual stress and shrinkage in injection compression molding. International Polymer Processing, 2003, 18(3): 313–320
|
5 |
Huang H, Li K, Li S. Injection-compression molded part shrinkage uniformity comparison between semicrystalline and amorphous plastics. Polymer-Plastics Technology and Engineering, 2008, 48(1): 64–68
|
6 |
Lee H S, Yoo Y G. Effects of processing conditions on cavity pressure during injection-compression molding. International Journal of Precision Engineering and Manufacturing, 2012, 13(12): 2155–2161
|
7 |
Silva C A, Viana J C, van Hattum F W J,
|
8 |
Kim N H, Isayev A I. Birefringence in injection-compression molding of amorphous polymers: Simulation and experiment. Polymer Engineering and Science, 2013, 53(8): 1786–1808
|
9 |
Wang C, Wang P. Analysis of optical properties in injection-molded and compression-molded optical lenses. Applied Optics, 2014, 53(11): 2523–2531
|
10 |
Xie M, Chen J, Li H. Morphology and mechanical properties of injection-molded ultrahigh molecular weight polyethylene/polypropylene blends and comparison with compression molding. Journal of Applied Polymer Science, 2009, 111(2): 890–898
|
11 |
Chen S, Chen Y, Peng H. Simulation of injection-compression-molding process. II. Influence of process characteristics on part shrinkage. Journal of Applied Polymer Science, 2000, 75(13): 1640–1654
|
12 |
Ho J Y, Park J M, Kang T G,
|
13 |
Li Y, Zhang Y, Li D. Shrinkage analysis of injection-compression molding for transparent plastic panel by 3D simulation. Applied Mechanics and Materials, 2011, 44–47: 1029–1033
|
14 |
Cao W, Min Z Y, Zhang S X,
|
15 |
Cao W, Hua S Z, Zhang S X,
|
16 |
Tryggvason G, Bunner B, Esmaeeli A,
|
17 |
Gueyffier D, Li J, Nadim A,
|
18 |
Young W B. Filling and postfilling analysis of injection/compression molding. International Polymer Processing, 2000, 15(4): 416–422
|
19 |
Araújo B J, Teixeira J C F, Cunha A M,
|
20 |
Muzaferija S, Gosman D. Finite-volume CFD procedure and adaptive error control strategy for grids of arbitrary topology. Journal of Computational Physics, 1997, 138(2): 766–787
|
21 |
Ubbink O, Issa R. A method for capturing sharp fluid interfaces on arbitrary meshes. Journal of Computational Physics, 1999, 153(1): 26–50
|
22 |
Patankar S. Numerical Heat Transfer and Fluid Flow. Columbus: McGraw Hill, 1980, 126–130
|
23 |
Agassant J F, Mackley M R. A personal perspective on the use of modelling simulation for polymer melt processing. International Polymer Processing, 2015, 30(1): 121–140
|
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