from the conferences organized by TANGER Ltd. provisional website
The two-dimensional task of isothermal rolling of aluminum sheet in the superplasticity conditions realized with a low angle of nip is considered. The solution of the task is based on the well-known mechanisms of the plastic flow in the wedge-shaped convergent canal. For the mathematical formulation of the task the theory of elasto-plastic processes ratios of the small curvature was attracted, and the state equation is suitable for the description of regularities of high-temperature deformation in the wide strain rate-rate interval including the conditions of superplasticity effect realization. The components of the movements rates vector, tensors of the stresses and strain rates are written down. The parameters summarized rate, geometrical contact factors in zones of backward and forward of rolling are determined. It is shown the existence of the angle of nip below which the center of deformation is considered only as forward of rolling zone. The specific calculations of the roll force distribution corresponds to thermal superplasticity conditions and outside of its applied to industrial alloy EN AW 5083 was carried out and the results were compared. The experimental realization of the process has been realized in the approximate chemical composition alloy EN AW Alustar with the producing fine-grained structure in the rolled product.Keywords: superplasticity, isothermal rolling, industrial alloy EN AW 5083, industrial alloy EN AW Alustar
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