Modélisation et optimisation du comportement mécanique des outils d'emboutissage stratifiés précontraints par vissage :

Abstract : In sheet metal stamping, the forming tools play a crucial role and the global cost of stamped parts is highly influenced by the cost of the tools, depending on the production volume. For low volume or for rapid prototyping, stamping tools can be made by an assemblage of steel sheets or layers, assembled by different techniques (glue, screws, bolts...). Each layer is obtained by laser cutting and micro-milling (as in the Stratoconception¯ approach). The present work deals with the design of stamping tools obtained by the assemblage of plates in layers and fixed by screws. We propose and validate a numerical approach for the 3D stress analysis of the multilayered tools. The final original objective is to optimize the layered stamping tools assembled by screws. In order to avoid the great difficulties involved for the numerical simulation of the stamping process taking into account deformable and layered tools assembled by screws, we develop a simplified approach based on two steps, based on the decoupling of the non-linearities of the stamping process and the linear elastic analysis of the deformable tools. Several examples are considered with multilayered steel tools assembled by screws and produced by the Stratoconception¯ approach. We finally proposed an optimization procedure of the screw positions as an attempt to improve the design and the strength of the layered tools by increasing the life duration of the screws
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Mourad Oudjene. Modélisation et optimisation du comportement mécanique des outils d'emboutissage stratifiés précontraints par vissage :. Autre. Institut National Polytechnique de Lorraine, 2005. Français. ⟨NNT : 2005INPL109N⟩. ⟨tel-01752502⟩

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