Etude du contrôle de procédé de projection laser pour la fabrication additive : Instrumentation, Identification et Commande.

Abstract : Applications using the direct metal deposition laser process have been expanded rapidly, particularly in aeronautics. However, this promising technology reported some difficult points and faced several problems, mainly the process instability. When these phenomena are not controlled, several defects was obtained (lack of mechanical strength, excessive porosity, poor surface, ... etc.). According to their distribution and size, non-conformity, deteriorate the mechanical characteristics of the parts was recorded and result in a significant cost of post-processing. Therefore, it is important to control the process, to make the process both robust and preserve the structural integrity of the piece. This requires the development of instrumentation through the control process, in order to have a real-time system able to adjust the process parameters to keep a high quality of the manufactured part. In this perspective, the studied thesis developed a technological solution (hardware and algorithms) based on cameras (vision) to monitor key parameters during manufacture. The application of this vision system has been allowed for the implementation of innovative methods by using modern automatic tools to monitor the status of the built part or even correct their defects during the manufacture parts, having a monitoring and process control in real time. Furthermore this vision system performed measurements for the inputs and outputs of the process, matched to a dynamic model that lead to the realization of the process control system.
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Rezak Mezari. Etude du contrôle de procédé de projection laser pour la fabrication additive : Instrumentation, Identification et Commande.. Automatique / Robotique. Ecole nationale supérieure d'arts et métiers - ENSAM, 2014. Français. ⟨NNT : 2014ENAM0050⟩. ⟨tel-01477707⟩

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