Abstract
It is important to reduce the amount of metal waste caused by scrap edge and scrap ends in the process of rolling at plate rolling mills. The influence of the correlation of the elongation ratio during drawing and spreading on the geometric shape of the strip plate was estimated. The paper shows the advantages of rolling process forming a double-cone profile at the head and tail sections. The ASC technology was introduced, which makes use of the multipoint strategy of thickness setting along the strip plate length. The importance of improving the accuracy of automatic control of position of screw-down structures and thickness was established when this strategy is used. The paper shows the structure and characteristics of the thickness automatic control system of the plate mill 5000. The analysis of oscillograph records of the strip plate thickness was carried out during the shaping pass for the current settings of the thickness automatic control system. Some deviations were recorded, which were caused by the lag of the regulating signal with respect to the actual deviation of thickness during displacement of the screw-down structures. To improve the response speed of the thickness automatic control system and to reduce the dynamic lag, a method of thickness control with pre-control was offered. The research group considered the double-circuit thickness automatic control system with the feed forward control of the target signal and established the transfer function of the pre-control channel. The paper demonstrated the structure of the simulation model of interrelated electric systems of a reverse rolling stand providing the opportunity of the joint research of shaped rolling and forming of a bend at the head end of the strip plate. The circuits of individual blocks of the model were considered. Comparative analysis of time curves of the strip plate thickness was carried out for the implementation of the design and the developed control algorithms and the increase in the response speed of the thickness automatic control system was proved. The paper demonstrates the oscillograph records obtained during the implementation of the developed algorithm in the automatic process control system of the reverse stand of the plate mill 5000. As a result of their comparison with the oscillograph records of the designed settings of the thickness automatic control system, it was proved that the accuracy of the thickness control improved. The paper notes that the main technological advantage of implementation of the developed algorithm is improving of the final product quality.
Keywords
Plate mill, reverse rolling stand, shaped rolling, automatic thickness control, system, accuracy, pre-control, method, structure, simulation model, development, simulation, experimental investigation, implementation.
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. Hashimoto T. Rolling of strip with the intermediate shape of a dogbone // Adv. Mater. and Process, 1989, no. 2, 386 p.
3. Development of new plane view control technique in plate rolling (NCC-DBR) // Nippon Kokan Technical Report. 1983, no. 39, pp. 21-30.
4. Heavy plates with special process design to meet extreme customer requirements / Oswald W., Streisselberger A., Thul R., Nehrenberg M.-J., Kirsch J. // METEC Congr. 94: 2nd Eur. Continuous Cast. Conf. and 6 th Int. Roll. Conf., Dusseldorf, June 20-22, 1994: Proc. Vol. 2.- Dusseldorf, 1994. pp. 42-51.
5. New developments in improving shape control, uield and flexibility of heavy plate mills / Aqrusti K., De Vito A., Liquory A.G., Paolicchi M. // METEC Congr. 94: 2nd Eur. Continuous Cast. Conf. and 6 th Int. Roll. Conf., Dusseldorf, June 20-22, 1994: Proc. Vol. 2. Dusseldorf, 1994, pp. 86-92.
6. Latest Plate Production Technology of Nippon Steel & Sumitomo Metal Corporation / Yuji Nomiyama, Takeo Yazawa, Hirotsugu Yasui // Nippon Steel & Sumitomo metal technical report, no. 110, September 2015, pp. 8-16.
7. Baskov S.N., Karandaev A.S., Osipov O.I. Electric power parameters of electric drives and development of systems of forming rolling of slabs for 2800 rolling mill // Privodnaya tekhnika [Electric drive equipment]. 1999, no. 1-2, pp. 21–24. (In Russian)
8. Gasiyarov V.R. Adjustment of speeds of electric drives and hydraulic screw-down structures at automatic control of the strip plate shape. Elektrotehnicheskie sistemy i kompleksy [Electrotechnical systems and complexes]. 2018, no. 4(41), pp. 22-29. DOI: 10.18503/2311-8318-2018-4(41)-22-29. (In Russian)
9. 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.
10. Karandaev, A.S. Radionov A.A., Khramshin V.R., Andryushin I.Yu., Shubin A.G. Automatic Gauge Control System with Combined Control of the Screw-Down Arrangement Position // 12th International Conference on Actual Problems of Electronic Insrument Engineering (АPEIE-2014). Novosibirsk, 2014. Vol. 1. P. 88-94. DOI: 10.1109/APEIE.2014.7040794.
11. Prinz K., Steinboeck A., Müller M., Ettl A., Kugi A. Automatic gauge control under laterally asymmetric rolling conditions combined with feedforward, IEEE Transactions on Industry Applications, vol. 53, no. 3, pp. 2560–2568, 2017. DOI: 10.1109/TIA.2017.2660458.
12. Identification and optimization for hydraulic roll gap control in strip rolling mill / SUN Jie, CHEN Shu-zong, HAN Huan-huan, CHEN Xing-hua, CHEN Qiu-jie, ZHANG Dian-hua // J. Cent. South Univ. (2015) 22: 2183−2191/ DOI: 10.1007/s11771-015-2742-0.
13. John P, Nicholas S.S, Marwan A.S. A new strategy for optimal control of continuous tandem cold metal rolling. IEEE Transactions on Industry Application, 2010, 46(2), pp. 703−711.
14. Modeling and control of plate thickness in hot rolling mills / Roland Heeg, Andreas Kugi, Olivier Fichet, Laurent Irastorza, Christophe Pelletier // IFAC Proceedings Volumes. Vol. 38, issue 1, 2005, pp. 13-18. DOI: 10.3182/20050703-6-CZ-1902.01681.
15. Salganik V.M., Gun I.G., Karandaev A.S., Radionov A.A. Tonkoslyabovye liteino-prokatnye agregaty dlya proizvodstva stalnykh polos [Thin slab casting and rolling plants for steel strip production]. М.: Bauman MSTU, 2003. 506 p. (In Russian)
16. Diego Alvarez , Alberto B. Diez, Faustino Obeso. Slab curvature compensation in hot rolling mill by means o Fuzzy Control, Paper at the III seminar on rolling Mill Rolls , Institute Latinoamericano del Fierro v Acero, Maxico, March, 9, 1988.
17. Ji Yafeng, Zhang Dianhua, Chen Shuzong, Sun Jie, LI Xu, Di Hongshuang, Algorithm Design and Application of Novel GMAGC based on Mill Stretch Characteristic Curve, Journal of Central South University March 2014, Vol. 21, Issue 3, pp. 942-947.
18. Terekhov V.M., Osipov O.I. Sistemy upravleniya elektroprividov [Electric drive control systems]. М.: Academy, 2005. 300 p. (In Russian)
19. Plotnikov Yu.V., Polyakov V.N. Sistemy upravleniya elektroprivodami postoyannogo toka [Control systems of direct current electric drives] (Sinamics DCM converter): textbook. Yekaterinburg: Publishing house of the Ural University, 2017. 96 p. (In Russian)
20. http://bsystem.ru/Portals/0/store/docs/f1055642-9184-4742-b677-e55c51ca15ce.pdf.
21. Klyuchev V.I. Ogranichenie dinamicheskikh nagruzok elektroprivoda [Limitation of dynamic loads of electric drive]. Мoscow: Energy, 1971. 380 p. (In Russian)
22. Tselikov A.I., Polukhin P.I., Grebenik V.M.Mashiny i agregaty metallurgicheskikh zavodov. Mashiny i agregaty dlya proizvodstva prokata [Machines and equipment of metallurgical plants. Machines and equipment for rolling]. Мoscow: Metallurgy, 1988. vol. 3. 680 p. (In Russian)
23. Baskov S.N., Gasiyarov V.R., Loginov B.M., Khramshin V.R., Odintsov K.E. [Development of mathematical model of interrelated electric systems of a rolling stand of a plate mill]. Izvestiya vuzov. Elektromekhanika [Proceedings of Universities. Electrical engineering]. 2017, vol. 60, no. 6, pp. 55–64. (In Russian)
24. Radionov A.A., Gasiyarov V.R., Baskov S.N., Karandaev A.S., Khramshin V.R. Mathematical Modeling of Mechatronics System "Hydraulic Screwdown Mechanism - Electric Drive of Rolling Mill Stand". 9th International Conference on Mechatronics and Manufacturing (ICMM). IOP Conf. Series: Materials Science and Engineering, 2018, 361, 012020. DOI:10.1088/1757-899X/361/1/012020.
25. Gasiyarov V.R., Maklakova E.A. Mathematical description of the main electric drive of the hot plate rolling mill 5000. Russian Internet Journal of Electrical Engineering. 2015, vol. 2, no. 3, pp. 62–66.
26. Shokhin V.V., Permyakova O.V., Kisel E.S. Investigation of electrical system of a rolling stand. Elektrotekhnicheskie sistemy i kompleksy [Electrotechnical systems and complexes]. 2014, no. 23, pp. 40–43. (In Russian)
27. Reifenstal U., Nguzen Hong Ha, Bannack A. Beseitigung der Ebenweits-abweichungen im Walzgut bei Umkerwalymashienen in Twindrive-Ausführung durch eine Winkelgleichlaufregelung der Antiebsstränge Magdeburg, 1996, 44 p.