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Intégration de fonctions avancées à l'inter-strate de pièces réalisées par le procédé de Stratoconception. Méthodologie et développement des outils associés

Abstract : Our research works are related to rapid prototyping, and specially to a solid layer manufacturing process, thé Stratoconception.
The process consists in automatically decomposing thé object into a séries of elementary layers, called strata, into which positioning inserts are placed. Each of thèse strata is directly laid out, and then manufactured using high-speed 2.5 axis micro-milling or 5-axis laser cutting of slabs of material. Ail of thèse éléments are then assembled in order to reconstruct thé final part. Today, if machining is automated by dedicated software and machines, assembling is a manual task made by thé process operator.
An assessment of thé current used methods for layers assembly (glueing, brazing, mechanical assembly...) show thé disadvantages and thé limitations of thèse fixing techniques. The stage of assembly is essential because it influences thé geometrical quality of thé part, thé mechanical résistance and thé manufacturing time. The used techniques do not guarantee thé system repeatability and can break thé numerical chain of thé process.
Our contribution relates to a new assembly method: jointing. It allows thé intégration of assembly features into layers, it improves fixing and reduces thé manufacturing time and costs. We developed a process planning System in thé process to generate this features. This system makes it possible to reduce work of parts assembly and thus makes this opération systematic, to minimize thé manual interventions and hazardous user choices. The software tools are abled to automate this opération, by generating assembly features, their form, their dimensioning and especially their location into layers. We présent various approaches of localization of thèse features through placement algorithms based on grids, forces of repulsion or genetic algorithm. The development of an original localization skeleton-based algorithm made it possible to optimize thé placement of thé features taking into account layers geometry. The results are analyzed and compared with a grid-based localization.
One second approach is proposed: complète jointing. The joint is generated from inter-layers contours induced thé build-in shape problem, i.e. mâle and female complementary shapes machining by thé tool (accessibility tool problem).
Lastly, we conclude thé manuscript by highlighting thé first industrial results through thé tools integrated into thé process software and thé parts manufactured by this new method.
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Submitted on : Wednesday, January 9, 2008 - 11:38:10 AM
Last modification on : Friday, October 23, 2020 - 8:38:02 AM
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  • HAL Id : tel-00203170, version 1



Benoît Delebecque. Intégration de fonctions avancées à l'inter-strate de pièces réalisées par le procédé de Stratoconception. Méthodologie et développement des outils associés. Automatique / Robotique. Université Henri Poincaré - Nancy I, 2007. Français. ⟨tel-00203170⟩



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