Shifting strategy optimization of the thermal work roll in hot strip rolling based on three particle swarms and differential evolution algorithm

ABSTRACT

During fast-paced rolling of the same type strip of hot tandem rolling, the thermal expansion of the work rolls has a significant influence on the shape of the on-load roll gap, which needs to be considered in the free shifting of the work rolls. In this paper, the thermal crown evaluation index and the thermal expansion simulation model of the work roll are established, and the influence of different roll shifting parameters on the thermal crown of the roll in the service cycle of the work roll is analyzed. A special roll shifting strategy of the downstream stand is designed, and intelligent optimization is carried out with the goal of thermal roll shape and uniform wear of work rolls. The optimized roll shifting strategy can significantly improve the strip shape quality.

KEYWORDS:

• Hot continuous rolling
• thermal expansion
• shifting strategy
• optimization algorithm
• fast-paced rolling
• strip profile
• work roll
• free-shifting roll

Acknowledgements

This work was financially supported by the National Key Research and Development Plan of China (No.2020YFB1713600), the National Natural Science Foundation of China (No. 51975043), the Fundamental Research Funds for the Central Universities (Nos. FRF-TP-19-002A3 and FRF-TP-20-105A1), and the China Postdoctoral Science Foundation (No. 2021M690352).

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by Fundamental Research Funds for the Central Universities [grant numbers FRF-TP-20-105A1, FRF-TP-19-002A3]; National Natural Science Foundation of China [grant number 51975043]; China Postdoctoral Science Foundation [grant number 2021M690352]; National Key Research and Development Plan of China [grant number 2020YFB1713600].