National University of Science and Technology “MISIS”, Moscow, Russia
D. B. Efremov, Cand. Eng., Associate Prof., Dept. of Metal Forming, e-mail: defremov@list.ru
Sh. Abdurashidov, Postgraduate Student, Dept. of Metal Forming, e-mail: abdu.sh.1994@mail.ru

The desire to increase the rolling speed and productivity of rolling mills, as well as to improve the quality of products and reduce their cost requires solving the problem of the stability of the movement of sheet metal between the stands of a continuous group. In the first passes, it sis strived to increase single reductions, but an increase in the elongation ratios and grip angles raises the risk of curvature of the front end of the strip, complicating the grip of the strip by the rolls of the next stand. The risks of emergency braking and stopping the strip between the stands of a continuous group limit the single reductions, rolling speed, productivity of the mill or casting and rolling complex (CRC). Using the example of the operating conditions of the 1950 mill, the first CRC in Russia of the OMK company (Vyksa), the first rolling operations of carbon steel in the zone of twin roughing stands are simulated. The study is based on finite element 3D modeling in the QForm software package. The output characteristic is the value of strip curvature 1/R (R is the radius of curvature of the strip) after the slab is reduced by edger rolls and exits the horizontal rolls of the first stand. The wear process of the rolls is taken into account. Of the possible causes of curvature during hot rolling, special attention is paid to the following factors: difference in “friction factors” (QForm term) of rolls of one pair; difference in roll diameters; difference in horizontal roll speeds (there is no such function on the 1950 mill, the roll drive is common). Examples of technical means for monitoring strip curvature during rolling under production conditions are shown, the capabilities and practical significance of which increase in the context of digitalization of production. Safe increase in single reductions and rolling speed in continuous groups of rolling mills will reduce the temperature wedge, make it possible to obtain thinner hot-rolled sheet and improve the quality of rolled products. The use of curvature models based on the accumulated data base will allow predicting the moment of emergency strip locking, choosing the optimal moment for changing rolls, identifying methods for process control and increasing production stability.

1. Pustovoytov D., Pesin A., Tandon P. Asymmetric (hot, warm, cold, cryo) rolling of light alloys: A review. Metals. 2021. Vol. 11, Iss. 6. 956.
2. Pustovoytov D. O., Pesin A. M., Perekhozhikh A. A., Sverdlik M. K. Modeling of shear deformations in the limit case of asymmetric thin-sheet rolling. Vestnik Magnitogorskogo gosudarstvennogo tekhnicheskogo universiteta imeni G. I. Nosova. 2013. No. 1 (41). pp. 65–68.
3. Muntin A. V., Sevidov A. E., Tikhonov S. M. et al. Analysis of wear characteristics of working rolls of finishing group of stands under conditions of 1950 mill of CRC “VMZ”. Metallurg. 2021. No. 3. pp. 57–62.
4. Zinyagin A. G., Borisenko N. R., Muntin A. V., Kruychkova M. O. Features of finite element modeling for hot rolling process of clad sheets and strips. CIS Iron and Steel Review. 2023. Vol. 26. pp. 51–57.
5. Konovalov Yu. V., Ostapenko A. L., Ponomarev V. I. Calculation of sheet rolling parameters. Handbook. Moscow: Metallurgiya, 1986. 430 p.
6. Lakiza V. A., Romantsev B. A., Aleshchenko A. S., Nazarov K. I. Study of wear of plugs during piercing of billetns on the screw rolling mill “MISiS-130D”. Metallurg. 2023. No. 11. pp. 124–128.
7. Aleshchenko A. S., Lakiza V. A., Romantsev B. A., Korol A. V. Study of the resistance of plugs when piercing billet made of 20Kh13 steel on the MISiS-130D screw rolling mill. Chernye metally. 2023. No. 12. pp. 70–74.
8. Korol A. V., Obydennov E. N., Aleshchenko A. S., Efremov D. B. Study of the final stage of the piercing process with and without a centering recess on two-high screw rolling mills with guide drive disks. Chernye metally. 2024. No. 12. pp. 61–68.
9. Kozhevnikov A. V., Skripalenko M. M., Rogachev S. O. et al. Research of steel strips microstructure and properties after symmetric and asymmetric cold rolling. Int. J. Adv. Manuf. Technol. 2025. Vol. 136. pp. 1649–1657.
10. Sevidov A. E., Muntin A. V., Rumyantsev A. V. Study of the friction coefficient during the steadystate process of continuous hot rolling of steel strips in conditions of the 1950 industrial mill. Chernye metally. 2021. No. 9. pp. 29–35.
11. GOST 21014–2022. Steel and alloy metal products. Surface defects. Terms and definitions. Introduced: 01.09.2022.
12. Vlasov A. V., Stebunov S. A., Evsyukov S. A. et al. Finite element modeling of technological processes of forging and die forging: tutorial. Moscow: Izdatelstvo MGTU imeni N. E. Baumana, 2019. 383 p.
13. Optical Distance Sensor ODS 10L18-L6X-M12. Leuze electronic. Available at: https://leuze.ru/ods10l18-l6x-m12-optical-distance-sensor-2695/ (accessed: 23.05.2025).
14. Updating the range of sensors. Sensorica. Available at: https://www.sensorica.ru/news115.shtml (accessed: 23.05.2025).
15. Official website of the Sensor-Com company. Available at: https://sensor-com.ru (accessed: 23.05.2025).
16. Electrical equipment series 314. Germany Electric. Available at: https://www.germanyelectric.ru/314 (accessed: 23.05.2025).
17. Official website of Baumer company Russia. Available at: https://баумер-россия.рф/ (accessed: 23.05.2025)