Mathematical modelling of the interrelated electric and mechanical systems of continuous sub-group of the rolling mill stands. Part 3. Study of way to coordinate linear speeds of edging and horizontal rolls
Keywords:
wide-strip hot-rolling mill, continuous train, automated electric drive, dynamic loads, speed coordination, compensation of dynamic torque, control methods, mathematical modelling, outcomeAbstract
The paper describes interrelated electromechanical systems of the continuous sub-train of the wide-strip hot-rolling mill (WSHRM). It notes peculiarities of interrelation of edging and horizontal rolls of the universal train that result in the repeated transient process within the electromechanical systems of edging rolls at strip gripping by horizontal rolls. It justifies the need for developing means to control electric drives of the universal stand providing limitation of their dynamic currents in this transient mode. The paper proposes a conceptual approach at which dynamic loads are limited due to consistent coordination of speed of the strip leaving rolls of the previous stand and linear one of the next stand with transfer of the control action in the rolling direction. It considers the methods for control of speed modes of electric drives installed at the continuous WSHRM sub-train than ensures implementation of this approach. A static error of speed control and dynamic torque of the electric motor of the next stand formed at strip gripping may be compensated by means of high-speed non-corresponding control of electric drive of the previous stand. The study provides outcome of study of the above methods by means
the developed mathematical model of the interrelated stands of the rouging continuous WSHRM train. It is proven that the proposed method of speed mode control helps to establish the best possible roll speed relation before strip grip. Based on the comparison of transient processes within the existing system of the electric drive control and those in the system implementing the methods developed, the study confirms that dynamic current of the edging roll motor may reduced by ±10 %. At this, there is practically no looping at the side of horizontal rolls at simultaneous rolling. It provides recommendations for commercialization of these technical solutions.
References
References
Radionov А.А., Karandaev A.S., Evdokimov A.S., Andryushin I.Yu., Gostev A.N., Shubin A.G. Mathe-matical Modelling of the Interrelated Electric and Mechanical Systems of Continuous Sub-Group of the Rolling Mill Stands. Part 1. Development of the Mathematical Model. Bulletin of the South Ural State University.
Ser. Power Engineering, 2015, vol. 15, no. 1, pp. 59–73. (in Russ.) DOI: 10.14529/power150108
Radionov А.А., Karandaev A.S., Khramshin V.R., Evdokimov A.S., Andryushin I.Yu., Gostev A.N.,
Shubin A.G., Gasiyarov V.R. Mathematical Modelling of the Interrelated Electric and Mechanical Systems of Continuous Sub-Group of the Rolling Mill Stands. Part 2. Study of Dynamic Loads in the Universal Mill Stands. Bulletin of the South Ural State University. Ser. Power Engineering, 2015, vol. 15, no. 2, pp. 67–76. (in Russ.) DOI: 10.14529/power150209
V. R. Khramshin, A. S. Karandaev, S. A. Evdokimov, I. Yu. Andryushin, A. G. Shubin, A. N. Gostev Re-duction of the Dynamic Loads in the Universal Stands of a Rolling Mill. Metallurgist, vol. 59, no. 3-4, 2015, pp. 315-323. DOI:10.1007/s11015-015-0103-8.
Karandaev A.S., Khramshin V.R., Galkin V.V., Gostev A.N. [Speed Adjustment Algorithm Improvement of the Stand Electric Drives of the Hot Rolling Mill Roughing Train]. Bulletin of the South Ural State University. Ser. Power Engineering, 2011, vol. 16, no. 34 (251), pp. 35–41. (in Russ.)
Karandaev A.S., Khramshin V.R., Radionov A.A., Andryushin I.Yu., Galkin V.V., Gostev A.N. [Coordination Speeds of the Interconnected Electric Drives of Cages of Draft Group Rolling Mill]. Trudy VII Mezhdunarodnoy (XVIII Vserossiyskoy) nauchno-tekhnicheskoy konferentsii po avtomatizirovannomu elektroprivodu [Proceedings of the VII International (XVIII All-Russian) Scientific and Technical Conference on Automated Electric]. Ivanovo, ISPU, 2012, pp. 652–657. (in Russ.)
Khramshin V.R. Razrabotka elektrotekhnicheskikh sistem nepreryvnoy gruppy stana goryachey prokatki pri rasshirenii sortamenta pоlоs. Dokt. Diss. [Development of Electrotechnical Systems of Continuous Hot Rol-ling Mill Group when Expanding Assortment of Bands. Doct. Diss.]. Magnitogorsk: Nosov Magnitogorsk State Technical University, 2013. 360 p.
Karandaev A.S., Khramshin V.R., Andryushin I.Yu., Golovin V.V., Shilyaev P.V., Petryakov S.A., Lukin A.A. [New Technical Solutions in Electric Drives and Control Systems of Manufacturing Parameters of Hot Rolling Mills]. Proceedings of TulGU. Technical Sciences., 2010, issue 3, part 2, pp. 34–40. (in Russ.)
Baskov S.N., Karandaev A.S., Osipov O.I. [Power Parameters of the Drives and System of the 2,800 mm Mill Sectional Slabbing]. Drive Equipment, 1999, no. 1–2, pp. 21–24. (in Russ.)
Khramshin V.R., Karandaev A.S., Radionov A.A., Andryushin I.Yu., Gostev A.N. [Dynamic Loads Reduc-tion of Mechanical and Electrical Equipment of the Hot Rolling Mill Roughing Train]. Russian Internet Journal of Industrial Engineering, 2013, no. 2, pp. 69–77. (in Russ.)
Karandaev A.S., Khramshin V.R., Andryushin I.Yu., Gostev A.N., Shurygina G.V. [Limitations of
the Shock Loads of the Electrical Equipment of the Continuous Sub-Trains of the Wide-Strip Hot-Rolling Mill]. Trudy VIII Mezhdunarodnoy (XIX Vserossiyskoy) konferentsii po avtomatizirovannomu elektroprivodu [Proceedings of the VIII International (XIX All-Russian) Conference on the Automatic Electric Drive]. Saransk, 2014, vol. 2, pp. 305–309. (in Russ.)
Fomin G.G., Dubeikovskii A.V., Grinchuk P.S. Mekhanizatsiya i avtomatizatsiya shirokopolosnykh stanov goryachey prokatki [Mechanization and automation of broadband hot rolling mills]. Moscow: Metallurgiya Publ., 1982. 128 p.
Voskaniants A.A. Avtomatizirovannoe upravlenie protsessami prokatki: ucheb. posobie [Automatic Con-trol of the Rolling Process: Proc. Guide]. Moscow: MSTU N.E. Bauman, 2010. 85 p.
Karandaev A.S., Khramshin V.R., Radionov A.A., Andryushin I.Yu., Galkin V.V., Gostev A.N. [Coordi-nation of the Speed Modes of the Electric Drives of the Continuous Train of the Rolling Mill]. Bulletin of Ivanovo State Power Engineering University, 2013, vol. 1, pp. 98–103. (in Russ.)
Andryushin I.Yu., Galkin V.V., Gostev A.N., Kazakov I.V., Evdokimov S.A., Karandaev A.S., Khramshin V.R., Khramshin R.R. [Method of the Automated Control of the Strip Tension in the Roughing Train of the Continuous Rolling Mill]. Patent RF, no. 2494828, 2013.
Radionov A.A., Andryushin I.Yu., Galkin V.V., Gostev A.N. [Limitation of the Minimum Speeds of
the 2,000 mm Rolling Mill Electric Drives at the Rolling Hollow Billets]. Bulletin of the Nosov Magnitogorsk State Technical University, 2011, no. 3, pp. 20–23. (in Russ.)
Andryushin I.Yu., Galkin V.V., Golovin V.V., Karandaev A.S., Radionov A.A., Khramshin V.R. [Auto-mated Speed Correction of the 2,000 mm Rolling Mill Electric Drives at the Rolling Hollow Billets]. Izvestiya vuzov. Elektromekhanika [Sci. Electromechanics], 2011, no. 4, pp. 31–35. (in Russ.)
Khramshin V.R. [Ways of Compensation Static Deviations Speed the Electric Drive of the Broad-Strip Hot Rolling Mill]. Elektrotekhnika, 2013, no. 4, pp. 49–55. (in Russ.)
Karandaev A.S., Khramshin V.R., Andryushin A.Ju., Golovin V.V., Shiljaev P.V. [Mathematical Modeling of Interconnected Electromechanical System of Stand Interspace of Hot-Strip Rolling]. Izvestiya vuzov. El-ektromekhanika [Russian Elecromecanics], 2009, no. 1, pp. 12–20. (in Russ.)
Khramshin V.R. [Developing and Implementation of Automated Electric Drive and Systems of Control-ling the Process Parameters of Wide-Strip Hot Rolling Mill]. Bulletin of Ivanovo State Power Engineering Univer-sity, 2012, no. 6, pp. 100–104. (in Russ.)
Khramshin V.R., Karandaev A.S., Evdokimov S.A., Andryushin I.Yu., Shubin A.G., Gostev A.N. [Reduc-tion of the Dynamic Loads in the Universal Stands of a Rolling Mill], Metallurg, vol. 59, no. 4, 2015, pp. 41–47. (in Russ.)
