Mesure in-situ du comportement des pièces en situation d'usinage à l'aide d'une mesure optique

Abstract : Structural aluminum alloy parts used in aeronautics are manufactured in several steps, from forming processes and heat treatments to final machining. Some of the process steps induce residual stresses. The material removal during machining release these residual stresses and thus, leads to the part deformation. The in-situ measurement of these deformations becomes necessary when this phenomenon is studied. The present work address this problematic in the context of the ANR SIMP-Aero Project. It aims to define a reliable experimental technique dedicated to the measurement of part deformations during machining of large aeronautical parts. The backbone of the technique relies on Digital Image Correlation (DIC). Mainly as a consequence of the harsh constraints environment of machining, the customization of DIC is required. First, movements of the optical system are quantified and compensated for the proper measurement of the workpiece displacement. Then, the metal chips that fly between the observed surface and the acquisition system are detected and filtered by the algorithm. Finally, the developed method enables the measurement of displacement fields throughout the whole machining sequence, without interrupting it, and a measurement uncertainty of around one hundredth of a millimeter is ensured.
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Guillaume Rebergue. Mesure in-situ du comportement des pièces en situation d'usinage à l'aide d'une mesure optique. Génie mécanique [physics.class-ph]. Université Clermont Auvergne, 2018. Français. ⟨NNT : 2018CLFAC065⟩. ⟨tel-02127807⟩

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