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In order to study the bending behavior of C45 sheet, after the process of multi-pass hot rolling, several thermo mechanical coupled finite element models (FEM) are established. The effects of different speed ratio, friction coefficient, initial thickness, initial temperature, roll diameter on the bending value are analyzed. In this work, a multi-pass alternate asymmetric rolling (MAAR) process is intended, and a formula is defined for calculating the bending degree of rolled sheet. The values of sheet curvature are predicted by FEM. The results show that MAAR greatly reduced the cumulative value of bending, while the final curvature increases with increasing of the speed ratio and work diameter, fluctuates with ascending of friction coefficient, initial thickness and initial temperature. This study indicates that MAAR, with two work rolls as small as possible, many rolling passes and same pass reduction, can product nearly flat hot-rolled sheet by selecting appropriate blank.

Curvature Analysis of Hot-rolled Steel Thin Plate Produced by Multi-pass Alternate Asymmetric Rolling