Citation: Hao Yang, Wei-chen Zhou, Xue-qin Gao, Jun Lei, Zhong-ming Li. Dynamic Numerical Simulation and Experiment Results of Oscillating Packing Injection Molding[J]. Acta Polymerica Sinica, ;2019, 50(12): 1348-1356. doi: 10.11777/j.issn1000-3304.2019.19111 shu

Dynamic Numerical Simulation and Experiment Results of Oscillating Packing Injection Molding

College of Polymer Science and Engineering, Sichuan University, Chengdu 610065

Corresponding author: Xue-qin Gao, gxqsnow@163.com
Received Date: 4 June 2019
Revised Date: 11 June 2019

To realize the intelligent precision manufacturing of oscillating packing injection molding (OPIM), the whole process of OPIM was creatively simulated by computer-aided technology, Moldflow. In the process of simulation, the model was built as a dumbbell-shaped tensile spline and the complex dynamic fluctuating flow field caused by reciprocating piston motion in packing stage was initially emulated by the Dynamic feed system. According to complex changes of temperature, pressure and extra shear field, cross WLF model were selected as the constitutive laws for HDPE in this study. The melt flow distribution, variation of the melt temperature and shear field in sample were investigated in OPIM simulation, meanwhile the results were also compared with those of conventional injection molding (CIM) simulation. The results show that, in the OPIM process, HDPE melts could repeatedly pass through the cavity at lower viscosity by the strong reciprocating motion of pistons, creating the temperature gradient at the thickness direction and forming a strong shear field, thus inducing the molecular chains to straighten and further form the shish-kebab structures. Finally, The real morphology and structure of OPIM and CIM samples were characterized by 2D-WAXD、SEM. The results show a higher orientation and more shish-kebab structure in OPIM compared with those in CIM. Melt flow traces observed by microscopy confirmed the multiple melt flow under the action of pistons in cavity. The simulation results are in good agreement with our experiment results. Finally, this article provide the theoretical OPIM process window for high-performance sample processing and new simulation ideas for special injection moldings additional external force field.
- Oscillating packing injection molding (OPIM),
- Dynamic feed,
- Skin-core structure,
- Simulation of packing stage,
- Shear rate distribution
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