Abstract
The efficiency of the flatness actuator is the cornerstone of the strip steel flatness control system and is pivotal in maintaining the quality of the strip shape and microstructure properties in commercial strip steel. However, the fluctuation in the thermal crown of the work rolls during the cold rolling process significantly impacts strip flatness quality. Obtaining real-time updates on the thermal crown alterations of the work rolls presents notable difficulties. Hence, the actual efficiency of the flatness actuator measured in the cold rolling environment fails to consider the effects of the work rolls’ thermal crown, undermining the control precision of strip shape. Exploring the mechanism through which the thermal crown of the work rolls influences strip shape is therefore crucial. This would allow for determining the efficiency of the flatness actuator, accounting for the work rolls’ thermal crown. In this research, an innovative approach is utilized, where FEM is used to create a highly accurate model. This model encapsulates the temperature-stress-strain field. This model effectively elucidates the time-varying influence of the hot roll shape on the strip shape, enabling the derivation of a dynamic strip flatness actuator efficiency curve for work roll bending and other actuators in the nonstationary rolling process. In addition, it addresses common challenges encountered in strip shape control during tandem cold rolling, such as the roll change stage and acceleration/deceleration stage.>
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The datasets used or analyzed during the current study are available from the corresponding author on reasonable request.
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Funding
This study was funded by the National Key R&D Program of China (2022YFB3304800), the National Natural Science Foundation of China (No. U20A20187), and the LiaoNing Revitalization Talents Program (No. XLYC2007087).
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Yufeng Zhang wrote the first draft of the paper. All authors revised and approved the final version of the manuscript.
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Zhang, Y., Zhao, M., Wang, Q. et al. Analysis of flatness actuator efficiency in thin strip steel tandem cold rolling by FEM considering the effect of time-varying work roll thermal crown. Int J Adv Manuf Technol 128, 4035–4047 (2023). https://doi.org/10.1007/s00170-023-12151-0
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DOI: https://doi.org/10.1007/s00170-023-12151-0