Simulation and analysis on cavity filling process in water-assisted injection molding

被引：0
|
作者：
Zhang Z. [1 ]
Zhou H. [1 ]
Gao Y. [2 ]
Yang H. [1 ]
机构：
[1] The State Key Lab of Fluid Power Transmission and Control, Zhejiang University
[2] Jiujiang Branch of 707Research Institute of CSIC
来源：
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | 2010年 / 46卷 / 08期
关键词：
Cavity filling process; Hollow molding ratio; Multiphase-multilayer flow; VOF model; Water-assisted injection molding;
D O I：
10.3901/JME.2010.08.140
中图分类号：
学科分类号：
摘要：
The present cavity filling model of water-assisted injection molding is suitable to thin-walled modeling but does not work with large diameter parts. Besides, the model doesn't consider turbulence in field of water with high Re number, fountain flow at melt front and wall thickness forming naturally. The simulation model of cavity filling process in water-assisted injection molding is based on the time dependent analysis, turbulence models, viscoplastic constitutive equations and so on. The k - ε and k - ω model are compared and the interfacial instabilities in multiphase-multilayer are analyzed. The simulation on various process control parameters is discussed. The investigation shows that increasing melt temperature and water injection flow rate or shortening delay time makes the residual wall thickness decrease. Extending delay time or decreasing melt temperature or increasing water injection flow rate makes the water injection pressure increase. These research results are close to experimental findings by other investigators. Especially, the delay time has little effect on load pressure but the effects of water injection flow rate and delay time are substantial. And the coupling characteristics of water injection pressure and flow rate are obvious. Hence the optimization of pressure control of water hydraulic system for water-assisted injection molding oriented by molding effects is provided. This is an important method to develop water-assisted injection molding technique. © 2010 Journal of Mechanical Engineering.
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页码：140 / 146
页数：6
相关论文
共 14 条
  • [1] Knights M., Water injection molding makes hollow parts faster, lighter, Plastics Technology, 48, 4, pp. 42-47, (2002)
  • [2] Michaeli W., Juntgen T., Brunswick A., WIT - en route to series production: first industrial application of the water injection technique, Kunststoffe Plast Europe, 91, 3, pp. 37-39, (2001)
  • [3] Protte R., Bangert H., Cooper C., Et al., Water-assist injection molding - an innovative process technology for productivity improvement: developments in processing, equipment and materials, Proceedings of the 61st Annual Technical Conference of SPE, pp. 404-408, (2003)
  • [4] Liang J.C., Li Y., Zhou D.H., Et al., Analysis of diffusion mechanism between gas and melt in gas-assisted injection molding, Journal of Materials Processing Technology, 187, pp. 685-689, (2007)
  • [5] Chang R.Y., Huang C.T., Yang W.H., Et al., The investigation of flow behavior of polymeric melts in the water assisted injection molding, Proceedings of the 62nd Annual Technical Conference of SPE, pp. 566-569, (2004)
  • [6] Xin Y., Ruan X., He C., Et al., Study on numerical simulation of cavity filling in gas-assisted injection molding, Chinese Journal of Mechanical Engineering, 39, 4, pp. 112-115, (2003)
  • [7] Li C.T., Isayev A.I., Primary and secondary gas penetration during gas-assisted injection molding part I: formulation and modeling, Polymer Engineering and Science, 44, 5, pp. 983-991, (2004)
  • [8] Wilcox D.C., Turbulence Modeling for CFD, (1993)
  • [9] Tzoganakis C., Perdikoulias J., Interfacial instabilities in coextrusion flows of low-density polyethylenes: experimental studies, Polymer Engineering and Science, 40, 5, pp. 1056-1064, (2000)
  • [10] Zhou G., Sun M., 3D-dimensional unsteady non-isothermal theoretical model and simulation of polymer multiphase-multilayer flow molding, Chinese Journal of Mechanical Engineering, 40, 9, pp. 16-22, (2004)
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