Journals Information
Universal Journal of Materials Science Vol. 5(1), pp. 7 - 14
DOI: 10.13189/ujms.2017.050102
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Material Flow Data for Numerical Simulation of Powder Injection Molding
I. Duretek 1,2,*, C. Holzer 1
1 Department of Polymer Engineering and Science, Montanuniversitaet Leoben, Austria
2 Polymer Competence Center Leoben GmbH, Austria
ABSTRACT
The powder injection molding (PIM) process is a cost efficient and important net-shape manufacturing process that is not completely understood. For the application of simulation programs for the powder injection molding process, apart from suitable physical models, exact material data and in particular knowledge of the flow behavior are essential in order to get precise numerical results. In this work, the flow behavior of a 316L stainless steel feedstock for powder injection molding was investigated. Additionally, the influence of pre-shearing on the flow behavior of PIM-feedstocks under practical conditions was examined and evaluated by a special PIM injection molding machine rheometer. In order to have a better understanding of key factors of PIM during the injection step, 3D non-isothermal numerical simulations were conducted with a commercial injection molding simulation software using experimental feedstock properties. The simulation results were compared with the experimental results. The mold filling studies amply illustrate the effect of mold temperature on the filling behavior during the mold filling stage. Moreover, the rheological measurements showed that at low shear rates no zero shear viscosity was observed, but instead the viscosity further increased strongly. This flow behavior could be described with the Cross-WLF approach with Herschel-Bulkley extension very well.
KEYWORDS
Viscosity, Rheology, Powder Injection Molding, Simulation, 316L
Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] I. Duretek , C. Holzer , "Material Flow Data for Numerical Simulation of Powder Injection Molding," Universal Journal of Materials Science, Vol. 5, No. 1, pp. 7 - 14, 2017. DOI: 10.13189/ujms.2017.050102.
(b). APA Format:
I. Duretek , C. Holzer (2017). Material Flow Data for Numerical Simulation of Powder Injection Molding. Universal Journal of Materials Science, 5(1), 7 - 14. DOI: 10.13189/ujms.2017.050102.