Modal approach based on global stereo-correlation for defects measurement in wire-laser additive manufacturing

Khalil Hachem; Yann Quinsat; Christophe Tournier; Nicolas Beraud

doi:10.1117/12.2688499

28 July 2023 Modal approach based on global stereo-correlation for defects measurement in wire-laser additive manufacturing

Khalil Hachem, Yann Quinsat, Christophe Tournier, Nicolas Beraud

Author Affiliations +

Proceedings Volume 12749, Sixteenth International Conference on Quality Control by Artificial Vision; 1274905 (2023) https://doi.org/10.1117/12.2688499
Event: Sixteenth International Conference on Quality Control by Artificial Vision, 2023, Albi, France

Abstract

Producing Near Net Shape parts with complex geometries using Wire-Laser Additive Manufacturing often requires a mastered and optimized process. Differences between the constructed and nominal geometries of the manufactured entities demand an in-situ defects measurement to complete the production of the entire part successfully. A contactless measuring system is needed to evaluate geometrical deviations without requiring complex post-processing operations. To overcome this challenge and validate a measuring tool that serves the manufacturing purpose, a global stereocorrelation approach is used to measure defects in wire-laser additively manufactured parts. This method relies on the cameras’ self-calibration phase that uses the part substrate’s nominal model. Then a modal basis is defined to model and evaluate the surface dimensional and shape defects. Hence, an analysis of the texture obtained in additive manufacturing is conducted to assess whether or not it is sufficient for image correlation and defects measurement. Finally, natural and pattern textures are compared to highlight their influence on the measurement results.

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Khalil Hachem, Yann Quinsat, Christophe Tournier, and Nicolas Beraud "Modal approach based on global stereo-correlation for defects measurement in wire-laser additive manufacturing", Proc. SPIE 12749, Sixteenth International Conference on Quality Control by Artificial Vision, 1274905 (28 July 2023); https://doi.org/10.1117/12.2688499

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KEYWORDS

Calibration

Additive manufacturing

Speckle pattern

Manufacturing

Cameras

Amplitude modulation

Autocorrelation

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