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Vers une prédiction du profil de rugosité à l'échelle mésoscopique lors de l'opération de laminage à froid

Abstract : An original methodology, which takes into account the presence of lubricant during cold rolling, is developed in order to reduce friction and to better control workpiece final roughness. To supply this model, it is essential to know the rheology of the strip as one of the blasted layer. It is given by an inverse methodology using FEM and Vickers test. To make it possible to determine plastic deformation behaviour, a relation between the mechanical conditions of contact is established from the finite elements model. The cold rolling model involves the strip with its asperities, the lubricant and the working roll. The strip asperities are modelled in 2D (trapezoidal shape) forming valleys and plateaus. A fluid-structure strong coupling is proposed to study the flattening of steel strip asperity during a cold rolling sequence. First the fluid pressure is obtained using a fluid structure model. This pressure is hydrostatic one. Then the dynamic effect of the fluid flow is added using an updating of the volume. This is obtained using local Reynolds’ equation. The lubricant flows through the secondary roughness of the top of the asperities. Thus, the volume of lubricant trapped and its pressure are updated on the cold rolling model. During computations, the asperity is deformed from the entry to the exit to obtain its final shape. Global parameters such as front, back tensions, speeds are taken into account but also rheological (fluid, solid) and tribological behaviours. The proposed methodology is applied to determine the strip surface profile after rolling. It makes it possible to determine the conditions of the cold rolling more adapted to better control strip final roughness.
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Anastasia Belotserkovets. Vers une prédiction du profil de rugosité à l'échelle mésoscopique lors de l'opération de laminage à froid. Génie mécanique [physics.class-ph]. Université de Valenciennes et Hainaut-Cambrésis, 2009. Français. ⟨NNT : 2009VALE0013⟩. ⟨tel-03023860⟩

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