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Étude des vibrations de pièce mince durant l'usinage par stéréo corrélation d'images

Toufic Wehbe 1 
1 Mécanique des Matériaux, Structures et Procédés - M2SP
LGP - Laboratoire Génie de Production
Abstract : The work presented in this thesis aims at understanding thin part vibrations during machining. Many works propose mode- lings of this phenomenon but differencies still exist between modeling results and tests. This observation lead us to wonder about the employment of natural modes of the part in the models, without taking into account the tool presence. The fact that punctual measurements don't enable to verify the validity of this hypothesis, field measurement prove to be a hopeful alternative. The second part focuses on adjusting a novel experimental protocol. It includes the recording of the thin part vibrating shapes by displacement field measurement. Digital Image Stereo Correlation is confronted to many limitations in this context. We developed a method to set sensors enabling the quick avoidance of difficulties. This method is presented in a graphical form, and underlines the need of optimising measurement parameters in such an environment. In the third part of the work, the measurement protocol is used. The sensors testing shows the high interest of contactless measurement for the aimed goal. Machininng tests are presented in connection with an existing model of chatter. The measured shapes during machining give a new sort of informations. So, their analyse implied the building of a specific processing procedure. The last part presents analyses of two machining tests. The study is done by parallely looking at the machined surface, and the behavior in temporal and frequency space as so as the part displacement fields. This approach underlines subtleties of surface generation under vibration conditions. The fields inspection enables to mark inconsistencies if employing the natural modes that are classically used in models.
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Toufic Wehbe. Étude des vibrations de pièce mince durant l'usinage par stéréo corrélation d'images. Génie mécanique [physics.class-ph]. Institut National Polytechnique de Toulouse - INPT, 2010. Français. ⟨tel-00744372⟩

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