Multi-roll levelling for wave defects of metal sheets based on the beam-membrane method
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Wave defects are the main flatness defects in rolled metal sheets and typically must be eliminated via multi-roll levelling for further use. Convex work rolls are the key component of the levelling process. The effectiveness of the description of the work roll and its bending characteristics determines the efficiency and accuracy of the levelling numerical analysis, which is also the key problem to be solved in the current research. This paper proposes a finite element expression method for convex work rolls that is based on the beam-membrane method by using a beam element to express the mechanical characteristics of the work rolls and the membrane elements to express the contact characteristics between the work rolls and the metal sheet. An effective multi-roll wave levelling model was established based on the beam-membrane method, and the influence of the bending parameters of the work rolls on the wave levelling performance was analysed. The results demonstrate that work rolls that have a parabolic bending curve can substantially reduce, but not eliminate, residual waves. The residual stress and curvature simulation have been discussed, and the comparison shows that the proposed method is closer to the real experiment result.
KeywordsRoll levelling Metal sheet Wave defects Beam-membrane method Bending parameters
This work is supported by the National Key R&D Program of China (2018YFB1701601) and the National Natural Science Foundation of China (51875515) and the Natural Science Foundation of Zhejiang Province (LY18E050001).
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