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Mass Flow Characterization of Selective Deposition of Polymer Powders with Vibrating Nozzles for Laser Beam Melting of Multi-material Components

  • The generation of multi-material components by laser beam melting (LBM) is a challenge which requires the invention of new coating devices for preparation of arbitrary powder patterns. One solution is the usage of vibration-controlled nozzles for selective deposition of polymer powders. Powder flow can be initiated by vibration enabling a start-stop function without using any mechanical shutter. In this report, the delivery of polymer powder by vibrating nozzles is investigated with respect to their application in LBM machines. Therefore, a steel nozzle attached to a piezo actor and a weighing cell is used in order to measure the stability and time-dependence of the powder mass flow upon vibration excitation with the usage of different kind of powder formulations. The results show that precompression of the powder inside the nozzle by vibration excitation is essential to realize a reliable start-stop function with reproducible discharge cyles and to prevent a initial flush of powder flow. Moreover, the use of different powder materials showed that mass flow is even possible with powders which are not optimized regarding flowability, but is readily enhanced with a factor of 2 to 3 by admixing Aerosil® fumed silica.

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Metadaten
Author:Thomas Stichel, Tobias LaumerORCiDGND, Tim Linnenweber, Philipp AmendGND, Stephan Roth
DOI:https://doi.org/10.1016/j.phpro.2016.08.099
ISSN:1875-3892
ISSN:1875-3884
Parent Title (English):Physics Procedia
Publisher:Elsevier
Place of publication:Amsterdam [u.a.]
Document Type:Article
Language:English
Year of first Publication:2016
Release Date:2022/11/24
Tag:laser beam melting; multi-material deposition; polymer powder; vibration-controlled powder nozzle
Volume:83
First Page:947
Last Page:953
Konferenzangabe:Laser Assisted Net Shape Engineering 9 International Conference on Photonic Technologies: Proceedings of the LANE 2016 September 19-22, 2016 Fürth, Germany
Institutes:Fakultät Maschinenbau
Fakultät Maschinenbau / Labor Additive and Intelligent Manufacturing for Sustainability (AIMS)
Begutachtungsstatus:peer-reviewed
Publication:Externe Publikationen
research focus:Produktion und Systeme
Licence (German):Creative Commons - CC BY-NC-ND - Namensnennung - Nicht kommerziell - Keine Bearbeitungen 4.0 International
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