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Comparison of dimensional accuracy and tolerances of powder bed based and nozzle based additive manufacturing processes
Fraunhofer Institute for Material and Beam Technology, IWS, Dresden, Germany. Institute of Materials Science, Technische Universität Dresden,Dresden, Germany.
Fraunhofer Institute for Material and Beam Technology, IWS, Dresden, Germany.
Fraunhofer Institute for Material and Beam Technology, IWS, Dresden, Germany.
Fraunhofer Institute for Material and Beam Technology, IWS, Dresden, Germany.
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2020 (English)In: Journal of laser applications, ISSN 1042-346X, E-ISSN 1938-1387, Vol. 32, no 3, article id 032016Article in journal (Refereed) Published
Abstract [en]

Additive manufacturing processes have the potential to produce near-net shaped complex final parts in various industries such as aerospace, medicine, or automotive. Powder bed based and nozzle based processes like laser metal deposition (LMD), laser powder bed fusion (LPBF), and electron beam melting (EBM) are commercially available, but selecting the most suitable process for a specific application remains difficult and mainly depends on the individual know-how within a certain company. Factors such as the material used, part dimension, geometrical features, as well as tolerance requirements contribute to the overall manufacturing costs that need to be economically reasonable compared to conventional processes. Within this contribution, the quantitative analysis of basic geometrical features such as cylinders, thin walls, holes, and cooling channels of a special designed benchmark demonstrator manufactured by LMD; LPBF and EBM are presented to compare the geometrical accuracy within and between these processes to verify existing guidelines, connect the part quality to the process parameters, and demonstrate process-specific limitations. The fabricated specimens are investigated in a comprehensive manner with 3D laser scanning and CT scanning with regard to dimensional and geometrical accuracy of outer and inner features. The obtained results will be discussed and achievable as-built tolerances for assessed demonstrator parts will be classified according to general tolerance classes described [DIN ISO 2768-1,Allgemeintoleranzen-Teil 1: Toleranzen fur Langen- und Winkelmasse ohne einzelne Toleranzeintragung(1991). Accessed 26 February 2018; DIN ISO 2768-2,Allgemeintoleranzen-Teil 2: Toleranzen fur Form und Lage ohne einzelne Toleranzeintragung(1991). Accessed 26 February 2018].

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2020. Vol. 32, no 3, article id 032016
Keywords [en]
additive manufacturing, dimensional accuracy, benchmark artefact, laser metal deposition, laser powder bed fusion, electron beam melting
National Category
Manufacturing, Surface and Joining Technology
Research subject
Manufacturing Systems Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-80461DOI: 10.2351/7.0000115ISI: 000547630700001Scopus ID: 2-s2.0-85087720603OAI: oai:DiVA.org:ltu-80461DiVA, id: diva2:1459332
Conference
Proceedings of the International Congress of Applications of Lasers & Electro-Optics (ICALEO® 2019)
Note

Godkänd;2020;Nivå 0;2020-08-19 (johcin);Konferensartikel i tidskrift

Available from: 2020-08-19 Created: 2020-08-19 Last updated: 2021-10-29Bibliographically approved

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Brückner, Frank

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