**Abstract**

Characteristics of a reverse four-high rolling stand of the plate mill 5000 of the PJSC “Magnitogorsk Iron and Steel Works” (“MMK”) are given in the article. As a result of the experiments carried out at the rolling mill, the research group confirmed a significant excess of dynamic loads of electric drives of both upper and bottom rolls during metal feeding over the set values. The research group determined the main causes of the unsatisfactory transient processes and confirmed the appropriateness of developing the ways of electric drive control, which will make it possible to reduce the loads and limit the fluctuations of torque during metal feeding. A method of electric drive control was offered to provide the decrease of excessive correction of the torque by means of preliminary setting of the gap in spindle junctions. The researchers considered the way of compensating the dynamic deviation of speed control by means of increasing the speed before the metal feeding. The comparative analysis of oscillograph records of torques and speeds confirmed the improvement of dynamic characteristics after implementation of the suggested control algorithms. The suggested method of control for electric drives of rolls and hydraulic screwdown structures provides the improvement of feeding conditions due to preliminary increase of the roll gap. The article shows oscillographs of speeds and torques for different variants of target values to change the position of screwdown structures. It was found that the target limiting of the dynamic torque cannot always be achieved. It was noted that it is necessary to carry out further investigations using mathematical modeling methods. The article offers recommendations aimed at commercial introduction of the developed technical solutions.

**Keywords**

Plate rolling mill, reverse stand, electric drive, dynamic load, limitation, methods, control systems, development, experimental studies, introduction, recommendations.

1. Khramshin V.R., Khramshina E.A., Karandaev A.S., Gasiyarov V.R., Voronin S.S. Control Methods and Systems Providing Reduced Consumption Index at Rolled Product Manufacture at Plate Mill. Proceedings of the IEEE NW Russia Young Researchers in Electrical and Electronic Engineering Conference (EIConRus). 2017, pp. 1540-1544. DOI: 10.1109/EIConRus.2017.7910865.

2. Karandaev A.S., Loginov B.M., Radionov A.A., Gasiyarov V.R. Setting Automated Roll Axial Shifting Control System of Plate Mill. Procedia Engineering, 2017, vol. 206, pp. 1753-1750. doi: 10.1016/j.proeng.2017.10.709

3. Krisanov A.F., Kuzerman V.F., Vinogradov B.N. et.al. Analiz prichin avariy oborudovaniya listoprokatnykh stanov i mery po ikh preduprezhdeniyu [Analysis of causes of equipment failures of rolling mill and measures measures preventing them]. Review, information. Institute “Chermetinformatsiya”. Moscow, 1985. 36 p. (In Russian)

4. Khramshin V.R., Karandaev A.S., Radionov A.A., Andryushin I.Yu., Gostev A.N. Reduction of dynamic loads of mechanical and electrical equipment of roughing train of a hot rolling mill. Mashinostroenie: setevoy elektronnyi nauchnyi zhurnal [Machine building: network electronic scientific journal]. 2013, no. 2, pp. 69-77. (In Russian)

5. Gasyarov V.R., Radionov A.A., Loginov B.M., Voronin S.S., Khramshin V.R. Improvement of Work Roll Bending Control System Installed at Plate Mill Stand. Proceedings of the 9th International Conference on Computer and Automation Engineering (ICCAE 2017). Sydney, Australia. 2017, pp. 269-273. DOI: 10.1145/3057039.3057105.

6. Shubin A.G., Loginov B.M., Khramshin V.R., Evdokimov S.A., Karandaev A.S. System of Automated Control of Hydraulic Screw-down Mechanisms of Plate Mill Stand. Proceedings of 2015 International Conference on Mechanical Engineering, Automation and Control Systems (MEACS). 2015. 6 p. DOI: 10.1109/MEACS.2015.7414858.

7. Khramshin V.R., Radionov A.A., Karandaev A.S., Evdokimov S.A., Shubin A.G., Loginov B.M. Mathematical modeling of interrelated electromechanical systems of continuous train of a rolling mill. Vestnik Yuzhnouralskogo gosudarstvennogo universiteta. Seriya: Energetika [Bulletin of the South-Ural state university. Series: Power engineering]. 2016, vol. 16, no. 1, pp. 47-55. (In Russian)

8. Gasyarov V.R., Radionov A.A., Loginov B.M., Voronin S.S., Khramshin V.R. Improvement of Work Roll Bending Control System Installed at Plate Mill Stand. Proceedings of the 9th International Conference on Computer and Automation Engineering (ICCAE 2017). Sydney, Australia. 2017, pp. 269-273. DOI: 10.1145/3057039.3057105.

9. Shilyaev P.V., Usatyi D.Yu., Radionov A.A. Automation of the plate rolling process at the rolling mill 5000. Izvestiya vuzov. Elektromekhanika [Proceedings of universities. Electromechanics]. 2011, no. 4, pp. 15-18. (In Russian)

10. Karandaev A.S., Khramshin V.R., Andryushin A.Yu., Golovin V.V., Shilyaev P.V. Mathematical modeling of interrelated electromechanical systems of the roll gap of a wide strip hot rolling mill. Izvestiya vuzov. Elektromekhanika [Proceedings of universities. Electromechanics]. 2009, no. 1, pp. 12-20.

11. Karandaev A.S., Khramshin V.R., Galkin V.V., Lukin A.A. Mathematical modeling of a thyristor drive with the switching structure. Izvestiya vuzov. Elektromekhanika [Proceedings of universities. Electromechanics]. 2010, no. 3, pp. 47-53.

12. Khramshin V.R., Andryushin I.Yu., Gostev A.N., Karandaev A.S. Mathematical modeling of interrelated electromechanical systems of the continuous train of a wide strip rolling mill. Mashinostroenie: setevoy elektronnyi nauchnyi zhurnal [Machine building: network electronic scientific journal]. 2013, no. 1, pp. 12-21. (In Russian)

13. Karandaev A.S. Improvement of automatic electric drives of rolling equipment. Mashinostroenie: setevoy elektronnyi nauchnyi zhurnal [Machine building: network electronic scientific journal]. 2014, no. 1, pp. 3-15. (In Russian)

14. Karandaev A.S., Khramshin V.R., Radionov A.A., Andryushin I.Yu., Galkin V.V., Gostev A.N. Adjustment of speeds of stand electric drives of continuous train of a rolling mill. Vestnik IGEU [Bulletin of IGEU], 2013, iss. 1, pp. 98-103. (In Russian)

15. Galkin V.V., Karandaev A.S., Golovin V.V., Radionov A.A., Khramshin V.R., Gasiyarov V.R., Zalogin O.A. Calculation algorithm of speed and load modes of stand electric drives of a rolling mill in the process of plate rolling. Izvestiya TulGU [Proceedings of TulGU]. Engineering. Issue 3: in 5 parts. Tula: Publishing center of TulGU, 2010, part 2, pp. 12-17. (In Russian)

16. Shilyaev P.V., Andryushin I.Yu., Golovin V.V., Radionov A.A., Karandaev A.S., Khramshin V.R. Algorithms of the digital system of automatic tension and loop control of a wide strip hot rolling mill. Elektrotekhnika [Electrical engineering]. 2013, no. 10, pp. 3-11. (In Russian)

17. Karandaev A.S., Khramshin V.R., Galkin V.V., Gostev A.N. Improvement of the speed adjustment algorithm of roughing train stand electric drives of a hot rolling mill. Vestnik YuUrGU. Seria “Energetuka” [Bulletin of YuUrGU. Series “Power engineering”]. Iss. 16. Chelyabinsk: FGBOU VPO “YuUrGU”, 2011, no. 34 (251), pp. 35-41. (In Russian)

18. Karandaev A.S., Khramshin V.R., Radionov A.A., Andryushin I.Yu., Galkin V.V., Gostev A.N. Speed adjustment of interrelated electric drives of roughing train stands of a rolling mill. Trudy VII Mezhdunarodnoy (XVIII Vserossiyskoy) nauchno-tekhnicheskoy konferentsii po avtomatizirovannomu elektroprivodu: FGOU VPO “Ivanovskiy gosudarstvennyi energeticheskiy universitet” [Proceedings of VII International (XVIII All-Russian) scientific and technical conference on automatic electric drive: FGOU VPO «Ivanovo state power university»]. Ivanovo, 2012, pp. 652-657. (In Russian)

19. Khramshin V.R., Karandaev A.S., Evdokimov S.A., Andryushin I.Yu., Shubin A.G., Gostev A.N. Reduction of the Dynamic Loads in the Universal Stands of a Rolling Mill. Metallurgist, vol. 59, no. 3-4, July 2015, pp. 315-323. DOI:10.1007/s11015-015-0103-8.

20. Khramshin V.R. Razrabotka elektrotekhnicheskikh system nepreryvnoy gruppy stana goryachey prokatki pri rasshirenii sortamenta polos [Development of electrotechnical systems of the continuous train of a hot rolling mill during expansion of strip range. Ph.D. Diss.]. Magnitogorsk: Nosov Magnitogorsk State Technical University, 2013. 393 р. (In Russian)

21. Khramshin V.R. System of an automated correction of stand electric drive speed for a wide strip hot rolling mill. Vestnik YuUrGU. Seriya «Energetika» [Bulletin of YuUrGU. Series “Powerengineering”]. 2012, iss. 18, no. 37(296), pp. 60-67. (In Russian)

22. Khramshin V.R. Methods of adjusting the static deflection of electric drive speed at stands of a wide strip hot rolling mill. Elektrotekhnika [Electrical engineering]. 2013, no. 4, pp. 48-55. (In Russian)

23. Galkin V.V., Petryakov S.A., Karandaev A.S., Khramshin V.R. Automatic adjustment of strip head thickness in hydro-SART of a wide strip hot rolling mill. Izvestiya vyshikh uchebnykh zavedeniy. Elektromekhanika [Proceedings of universities. Electrical engineering]. 2011, no. 4, pp. 46-50. (In Russian)

24. Karandaev A.S., Khramshin V.R., Petryakov S.A. Monitoring system of automatic control of strip thickness at a hot rolling mill. Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2011, no. 3, pp. 25-29. (In Russian)

25. Hramshin V.R., Karandaev A.S., Radionov A.A., Hramshin R.R. Study of Thickness Control of Strip Head Section Using Mathematical Simulation Methods. Vestnik YuUrGU. Seriya Energetika [Bulletin of YuUrGU. Series “Power engineering”]. Iss. 13. Chelyabinsk: FGBOU VPO “YuUrGU”, 2013, no. 1, pp. 144-151. (In Russian)

26. Baskov S.N., Karandaev A.S., Osipov O.I. Power parameters of drives and the system of shaped slab rolling at 2800 mill. Privodnaya tekhnika [Electrically driven equipment]. 1999, no. 1-2, pp. 21-24. (In Russian)