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Multi-material deposition of polymer powders with vibrating nozzles inside laser beam melting machines

  • The generation of multi-material components using Laser beam melting (LBM) is a challenge which requires the invention of new coating devices for the 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 even when using powders with low flowability. In this report, the selective deposition 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 is applied, whereas the nozzle itself features internal channels which allow the precise control of the powder temperature using heat transfer oil. The setup is used to study the influence of temperature on the powder mass flow. The results show that, next to the vibration mode, the temperature strongly influences the powder mass flow which is done by affecting the moisture and thus the particle-particle adhesion forces. This shows that a precise control of the powder temperature inside the nozzle is required in order to achieve a constant mass flow and thus a successful application of vibrating nozzles inside LBM machines.

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Metadaten
Author:Thomas Stichel, Philipp AmendGND, Tobias LaumerORCiDGND, Stephan Roth
Parent Title (English):6th International Conference on Additive Technologies - iCAT 2016 : proceedings : Nürnberg, Germany, 29.-30. November 2016
Publisher:Interesansa - zavod
Place of publication:Ljubljana
Document Type:conference proceeding (article)
Language:English
Year of first Publication:2016
Release Date:2022/11/25
Tag:PA12; laser beam melting; multi-materialdeposition; polyamide 12; vibration-controlled powder nozzle
Institutes:Fakultät Maschinenbau
Fakultät Maschinenbau / Labor Additive and Intelligent Manufacturing for Sustainability (AIMS)
Publication:Externe Publikationen
research focus:Produktion und Systeme
Licence (German):Keine Lizenz - Es gilt das deutsche Urheberrecht: § 53 UrhG