Image-based algorithm for nozzle adhesion detection in powder-fed directed-energy deposition
Autor: | Christoph Leyens, Holger Perfahl, Jens Bliedtner, Frank Brückner, Martin Reisacher, Christian Kledwig |
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Rok vydání: | 2020 |
Předmět: |
business.product_category
Materials science Nozzle Biomedical Engineering Process (computing) Image processing Welding engineering.material Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention Machine tool law Tool steel engineering Deposition (phase transition) Coaxial business Instrumentation Algorithm |
Zdroj: | Journal of Laser Applications. 32:022021 |
ISSN: | 1938-1387 1042-346X |
DOI: | 10.2351/7.0000070 |
Popis: | The rapidly growing technological innovation of directed energy deposition leads to an increase in part complexity as well as quality and mechanical properties of manufacturable components. However, the variety of process parameters and influencing factors still requires skilled operators, who observe the machine tools. For an unobserved use of deposition welding machines, well parametrized and validated monitoring systems have to analyze the process to detect irregularities and finally initiate a machine stop. This study focuses on nozzle adhesions that frequently occur when tool or high-speed steels are processed. This effect leads to decreasing quality or ultimately to a failure of the whole welding process. In this work, the authors present an algorithm and the corresponding parametrization to automatically detect nozzle adhesions based on images from a coaxial camera, integrated in the laser head. The algorithm is based on a detailed image analysis from which temporal and spatial patterns are derived. In particular, the algorithm calculates a nozzle adhesion indicator based on the heat intensity distribution in an experimentally derived shaped area on the inner nozzle boundary. It is parametrized in such a way that process-critical adhesions are detected. The algorithm was parametrized using an experimental setup with four materials: stainless steel (X2CrNiMo17-12-2), tool steel (X35CrMoMn7-2-1), high-speed steel (HS6-5-2C), and the nickel-based alloy NiCr19NbMo. |
Databáze: | OpenAIRE |
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