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A numerical simulation study of mold filling in the injection molding process

Baum Markus, Anders Denis

Computer Methods in Materials Science

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2021

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Vol. 21, No. 1

25--34

EN

Injection molding can undoubtedly be regarded as one of the most widely used manufacturing processes for polymers (Guevara-Morales & Figueroa-Lopez, 2014). Furthermore, injection molding has found its way into various branches of industry (Fernandez et al., 2018) since it has several essential advantages over other processing techniques in terms of good surface finish, the ability to process complex parts without the need for secondary operations, and low cost for mass production. In order to find optimal process settings, it is necessary to gain a deeper insight into the filling process and the underlying physical phenomena, as well as a thorough understanding of the complex material behavior. In this context, the numerical simulation of the injection molding process is increasingly important. Therefore, the current contribution is dedicated to present a thorough comparative numerical study for the mold filling of an exemplary thin-walled mold geometry, including a realistic non-Newtonian viscosity model for the polymer melt. For the numerical simulation, the authors employ the commercial CFD software packages Cadmould 3D-F and ANSYS CFX. While ANSYS CFX is a well-established CFD software for numerical modelling of multiphysical phenomena, Cadmould 3D-F is a highly specialized and computationally efficient alternative suitable for certain geometric configurations in the context of injection molding. The present study is new in the sense that it demonstrates the equivalence of the considered software packages for the simulation of the injection molding process in thin-walled mold geometries.

2

The Impact of the Thickness of the Ceramic Shell Mould on the (γ + γ') Eutectic in the IN713C Superalloy Airfoil Blade Casting

Szczotok A., Nawrocki J., Pietraszek J.

Archives of Metallurgy and Materials

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2017

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Vol. 62, iss. 2A

587--593

EN

In the study the wall thickness of ceramic shell mould influence on (γ + γ') eutectic in the IN713C nickel-based superalloy airfoil blade casting was described. Two castings formed as a blade from two wax pattern assemblies were analysed. In the experiment in one pattern the thick ceramic layer was obtained on pressure side and in another one on suction side of the airfoil blade. The microstructure of the crosssections of the castings were observed on polished and etched metallographic specimens. The microstructure and phases chemical compositions of specimens was analyzed by using the scanning electron microscope Hitachi S-4200 equipped with EDS. It was established, that wall thickness of ceramic shell mould affect size, shape and volume fraction of (γ + γ') eutectic islands in airfoil blade made from IN713C superalloy. The analysis was provided in accordance to the typical statistical methodology [1].

3

Problemy inwestycji telekomunikacyjnych a ochrona środowiska w dobie społeczeństwa informacyjnego

Macher M., Kałuski M.

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

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2008

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R. 81, nr 2-3

104-108

PL

Przedstawiono zagadnienia dotyczące ochrony środowiska przed elektromagnetycznym promieniowaniem niejonizującym, a w szczególności podstawowe informacje na temat pola elektromagnetycznego, charakterystykę źródeł pola elektromagnetycznego (głównie anten), oddziaływanie pól elektromagnetycznych na człowieka, zagadnienia normalizacji w kraju i na świecie, w tym sposoby ustalania dopuszczalnych poziomów pól elektromagnetycznych w środowisku populacji generalnej i zawodowej oraz metody ich sprawdzania.

EN

Those issues pertain to environment protection against non-ionizing electromagnetic radiation, in particular the information about radio communication systems, basic problems upon electromagnetic field, characteristic of EM-field sources (mainly antennas), influence of EM-field on human, standardization issues home and abroad, therein the setting modes of allowable levels of fields in the environment of general and occupational population and methods of verifying them.