| Autor: |
Wolff, Rebecca, Damanik, Hogenrich, Fatima, Arooj, Turek, Stefan, Malatyali, Hatice, Rudloff, Johannes, Baudrit, Benjamin, Hochrein, Thomas, Bastian, Martin |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; 2024, Vol. 3158 Issue 1, p1-6, 6p |
| Abstrakt: |
In the Material Extrusion process (MEX) the main limiting factor is the printing speed, as is the case in many other Additive Manufacturing (AM) processes. In order to enhance the printing speed, systematic experimental investigations are necessary to understand the material dependent processes in the nozzle. In MEX, the filament partially melts inside of a heated hot end and the flow is induced by the feeding force of the solid filament part, acting as a stamp on the molten polymer. In a previous work by Wolff et al., Computational Fluid Dynamics (CFD) simulations of the MEX hot end were performed based on experimental studies using the experimental maximum feeding rate as the upper boundary condition. It was depicted that the numerical model can accurately predict the feeding force and can represent the change between process windows as the speed increases. To calculate the maximum feeding rate, the heat transfer conditions in the hot end must be considered. In this study, various techniques for determining the upper limit of feeding rates are evaluated for acrylonitrile-butadiene styrene (ABS) and polypropylene (PP) materials with different nozzle geometries. When the solid filament cone reaches the contraction zone with glass transition respectively melting temperature at maximum feeding rates, the results match well with the experimental data. Ultimately, it is possible to quantify the heat transfer in the nozzle through numerical modelling of the filament feeding force. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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