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| An analytical model of hot rolling force for a thick plate by combining globally optimal approximation yield criterion and egg-circular velocity field |
| Shun-hu Zhang1, Yi Zhang1, Wen-hao Tian1, Yan Li1 |
| 1 Shagang School of Iron and Steel, Soochow University, Suzhou 215021, Jiangsu, China |
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Abstract For the sake of solving the problem that it is difficult to be integrated for the Mises specific plastic power due to its nonlinearity, a new linear criterion, named the globally optimal approximation criterion, is constructed by the polygonal approximation to the Mises circle. The new criterion is proved to be the linear function of the principal stress components σ1, σ2 and σ3 and the trajectory of it on the p-plane is a non-equiangular but equilateral dodecagon intersecting the Mises circle. The theoretical results of the current criterion described by the Lode stress parameters are in excellent accordance with the experimental results. Meanwhile, according to the trend that the metallic flow velocity between rollers aggrandizes gradually from the inlet to the outlet during the hot rolling of a thick plate, a biomimetic velocity field is proposed in which the horizontal velocity component fits the egg-circular curve distribution. The velocity field and its simulated results agree quite well. Subsequently, using the determined linear criterion, energy analysis of the constructed velocity field is utilized to obtain the interior deformation power, while the vector decomposition approach is utilized to obtain the frictional power and shear power. On this basis, the overall power is obtained and the analytical solutions are generated for the rolling torque, rolling force and the coefficient of the stress state under different egg curves by minimizing the neutral angle. Furthermore, the parameter optimization of the characteristic parameter ρ which affects the slope of the egg-circular curve is carried out and the best egg-circular curve which can minimize the energy consumption is determined. The best agreement between the theoretical and observed values of rolling force and rolling torque is under this curve, and the mean relative errors of the rolling torque and rolling force are no more than 2.93%, while the maximum error is no more than 8.35%.
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| Cite this article: |
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Shun-hu Zhang,Yi Zhang,Wen-hao Tian, et al. An analytical model of hot rolling force for a thick plate by combining globally optimal approximation yield criterion and egg-circular velocity field[J]. Journal of Iron and Steel Research International, 2024, 31(3): 647-659.
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2024, Vol. 31 
