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A Study on the accuracy of Thermography-based Temperature measurement in Powder-fed directed energy deposition
Development Department, Sauer GmbH LASERTEC, DMG MORI AG, Pfronten, 87459, Germany.
Development Department, Sauer GmbH LASERTEC, DMG MORI AG, Pfronten, 87459, Germany.
Development Department, Sauer GmbH LASERTEC, DMG MORI AG, Pfronten, 87459, Germany.
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Produkt- och produktionsutveckling. Additive Manufacturing and Printing, Fraunhofer Institute for Material and Beam Technology IWS, Dresden, 01277, Germany.
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2020 (Engelska)Ingår i: 20th CIRP Conference on Electro Physical and Chemical Machining / [ed] Konrad Wegener, Moritz Wiessner, Elsevier, 2020, s. 35-41Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

Due to continuous development and increasingly deep understanding of the additive process, directed-energy deposition (DED) is becoming more and more interesting for industrial use. However, both the number of influencing factors and the process complexity, still require well-trained operators who can monitor and understand the machine tools. In order to facilitate the operators and to enable longer unattended processes, higher process safety, reliable monitoring systems and closed-loop controller are required. For example, despite a large number of investigations, the monitoring and control of the temperature distribution within the work piece still poses a big challenge.

This study focusses on workpiece temperature measurement using a thermal imaging camera that observes the entire machining area. In order examine the measurement error caused by different viewing angles (φ = 0 … 75°), object temperatures (T = 333 … 1073K), surface conditions (welded and milled) and materials (316L, Inconel 718 and CuAl10) commonly used in DED, several approaches were followed using a thermal camera.

It was found that surface condition and material cause the greatest measuring errors (up to +325K |−453K).). However, the measuring errors can be significantly reduced by suitable selection of the emissivity, so that it is possible to measure even the milled CuAl10 surface at a known viewing angle with a measuring error of +13.3% |−10.9%.

Ort, förlag, år, upplaga, sidor
Elsevier, 2020. s. 35-41
Serie
Procedia CIRP, ISSN 2212-8271 ; 95
Nyckelord [en]
directed energy deposition, laser metal deposition, laser cladding, thermal imaging, temperature distribution, process monitoring
Nationell ämneskategori
Bearbetnings-, yt- och fogningsteknik
Forskningsämne
Produktionsutveckling
Identifikatorer
URN: urn:nbn:se:ltu:diva-82779DOI: 10.1016/j.procir.2020.02.251Scopus ID: 2-s2.0-85102039532OAI: oai:DiVA.org:ltu-82779DiVA, id: diva2:1525765
Konferens
20th CIRP International Conference on Electro Physical and Chemical Machining (ISEM XX), 19-21 January, 2021, Zurich, Switzerland
Tillgänglig från: 2021-02-04 Skapad: 2021-02-04 Senast uppdaterad: 2021-04-12Bibliografiskt granskad

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Brückner, Frank

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