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Contribution au tolérancement fonctionnel 3D des mécanismes complexes : synthèse des spécifications et analyse de tolérances

Abstract : This study is dedicated to the design of a computer aided tolerancing system guarantying the multi user, multi products and temporal control of nominal dimensions and tolerances for complex mechanisms. This work is part of the industrial “numerical plant” project and represents a missing link of this numerical chain. Present works contribute to the CLIC method (french acronym for ! Cotation en Localisation avec Influence des Contacts”) applied to complex junctions by proposing the appropriate specification and the three dimensional tolerance chain calculation at worst case, in the framework of non-deformable parts. The study leads to eleven new specification proposals, which are not currently available in standards used by industries. The extension of material conditions to complex surfaces is a key point. A new association criterion has been proposed to specify hybrid prismatic surfaces, with a surface contact zone and a zone with clearance. A contact points search algorithm has been elaborated to obtain the three dimensional tolerance chain resultant, as a function of parts’ tolerances and nominal dimensions, in order to perform the tolerance synthesis. Others algorithms use an analytic formulation to determine the worst case configuration. Those algorithms are the problem solve by analysis line method outcomes.
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Robin Chavanne. Contribution au tolérancement fonctionnel 3D des mécanismes complexes : synthèse des spécifications et analyse de tolérances. Autre. École normale supérieure de Cachan - ENS Cachan, 2011. Français. ⟨NNT : 2011DENS0026⟩. ⟨tel-00661712⟩

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