Moscow Polytechnic University, Moscow, Russia
R. L. Shatalov, Dr. Eng., Prof., Dept. of Materials Forming and Additive Technologies, e-mail: r.l.shatalov@mospolytech.ru

The results of an experimental study of the distribution of external longitudinal stresses measured by a magnetoanisotropic sensor (MAS) over a width of 250 mm of a steel 08kp strip with a thickness of about 1 mm during cold rolling at the exit of the mill 205/360×500 are presented. It has been experimentally established that the magnitude and distribution of contact stresses across the width of the strip are affected by the magnitude and nature of the distribution of longitudinal stresses in the outer parts of the roll. An increase in tensile stresses in the outer parts of the strip leads to a decrease in the normal contact stresses and the average pressure of the metal on the rolls, and vice versa. An equation is proposed for calculating the coefficient of influence of uneven longitudinal stresses on the pressure of the metal on the rolls. Using CAD, computer modeling and calculation of the deformation and force indicators of thin strip rolling were carried out, taking into account the influence of the characteristics of the outer parts of the rolled product on the deformation zone. Changes in the rolling forces along the length of thin strips of 08kp steel on a 150×235 mill equipped with a microcontroller system for measuring the loads on the rolls are shown. Measurements showed that the rolling force during deformation of the end sections of the strips is 2–3 times less than the middle part of the rolled product, due to the weak influence of the outer parts of the strip on the pressure and rolling force. A quantitative analysis of changes in the size of strips and rolling forces in stationary and unsteady sections along the length of the strip has been carried out. The equation for determining the average pressure of the metal on the rolls has been refined, taking into account the influence of the external parts and the rigidity of the strip on the deformation zone during thin-sheet rolling. It is shown that the proposed equations can significantly improve the accuracy of pressure calculation and determination of rolling forces along the length of thin strips and strips. Taking into account the influence of the characteristics of the outer "hard" parts of the strip makes it possible to reduce the error in determining the average pressure, on average from 23.8 to 4.9%.

1. Maksimov E. A., Shatalov R. L., Boskhamdzhiev N. Sh. Production of flatness strips during rolling. Moscow : Teplotekhnik, 2008. 336 p.
2. Chernyi V. A., Chabonenko A. A., Yankova S., Tambovskaya S. V., Karavaev A. V. Self-leveling of deformation across the strip width. Collection of scientific works of the International scientific and practical conference “Modern metallurgy at the beginning of the new millennium. To the 80^th anniversary of NLMK." November 17–21, 2014. Lipetsk : Izdatelstvo LGTU, 2014. pp. 33–37.
3. Shatalov R. L. Study of metal deformation conditions at the stages of rolling the “hard” and “soft” ends of the strip. Proizvodstvo prokata. 2011. No. 8. pp. 14–17.
4. Polyakov B. A., Kotsar S. A. Influence of rolling conditions on the distribution of residual stresses across the strip width. Izvestiya vuzov. Chernaya metallurgiya. 1988. No. 10. pp. 54–57.
5. Kucheryaev B. V., Zinoviev A. V., Krakht V. B. et al. Experimental verification of the formula for calculating the energy-power parameters of sheet rolling. Proizvodstvo prokata. 2002. No. 4. pp. 2–7.
6. Belskiy S. M., Mukhin Yu. A. Classification of technological principles for regulating the flatness of strips. Stal. 2009. No. 11. pp. 47–50.
7. Shatalov R. L., Koynov T. A., Litvinova N. N. Automation of technological processes of rolling and heat treatment of metals and alloys : textbook. Moscow : Metallurgizdat, 2010. 368 p.
8. Agureev V. A., Kuryakin A. V., Rudnev V. S. et al. Experience in using the IP-4-GP strip flatness meter at a hot rolling mill. Metallurgiya. 2004. No. 1. pp. 41–45.
9. Mingwi B., Chunhun J., Ramelot D. et al. Modern flatness control system for improving strip quality at Benxi Hot Rolling Mill No. 1. Chernye Metally. 2005. No. 6. pp. 60–65.
10. Reinschke I. U., Schmid F., Lamp H., Miele M. New strip profile and flatness control system for a hot rolling mill. Chernye Metally. 2004. No. 7. pp. 43–49.
11. Shatalov R. L., Kulikov M. A. Influence of the outer parts of the strip on deformation and force parameters during thin-sheet rolling. Metallurg. 2020. No. 9. pp. 34–40.
12. Belskiy S., Mazur I., Lezhnev S., Panin E. Distribution of linear pressure of thin-sheet rolling across strip width. Journal of Chemical Technology and Metallurgy. 2016. Vol. 51, Iss. 4. pp. 371–378.
13. Kozhevnikov A. V., Skripalenko M. M., Kozhevnikova I. A., Skripalenko M. N. Estimation of deformation zone parameters during symmetric and asymmetric cold strip rolling using computer modeling. Tekhnologiya metallov. 2022. No. 12. pp. 43–51.
14. Sidelnikov S., Dovzhenko I., Belokonova I. Simulation of process rolling plates from alloy of Al–Mg system economically doped with scandium. Solid State Phenomena. 2021. Vol. 316. pp. 509–514.
15. Skripalenko M. (Jr.), Skripalenko M., Tran Ba Hui, Ashuhmin D. et al. Detection of influence of upper working rolls vibration on thickness of sheet at cold rolling with the help of DEFORM-3D software. Computer Research and Modeling. 2017. Vol. 9, Iss. 1. pp. 111–116.
16. Skripalenko M. (Jr.), Skripalenko M., Ashikhmin D., Sidorov A., Yang X. Wavelet analysis of fluctuations in the thickness of cold-rolled strip. Metallurgist. 2013. Vol. 57, Iss. 7-8. pp. 606–611.
17. Kozhevnikov А., Bolobanova N., Kozhevnikova I., Shalaevskii D. The Study of influence of work rolls vibration during cold rolling on the quality of steel strip surface. Metalurgija. 2020. Vol. 59, Iss. 1. pp. 74–76.
18. Kozhevnikova I. A., Bolobanova N. L., Kozhevnikov A. V., Yusupov V. S., Kroitor E. N. Frictional-stress distribution in the deformation zone on cold rolling. Steel in Translation. 2018. Vol. 48. No. 7. pp. 454–457.
19. Baranov G. L. Influence of strain hardening on the force in cold strip rolling. Steel in Translation. 2018. Vol. 48. No. 11. pp. 739–744.
20. Baranov G. L. Improved calculation of the contact stress in strip rolling. Steel in Translation. 2015. Vol. 45. No. 6. pp. 447–452.
21. Garber E. A., Shalaevskii D. L., Kozhevnikova I. A., Traino A. I. Procedure and algorithms for the energy-force calculation of cold rolling allowing for the number of neutral sections in the deformation zone. Russian Metallurgy (Metally). 2008. Vol. 2008. No. 4. pp. 315–325.
22. Belskiy S. M., Pimenov V. A., Shkarin A. N. Assessment of the actual shape of the hot-rolled strip cross-section contour. Part 2. Profile classifier. Chernye Metally. 2020. No. 12. pp. 33–37.
23. Shkarin A. N., Bel’skii S. M., Pimenov V. A. Influence of the cross-sectional shape of hot semifinished rolled products on the formation of the plot of specific tension in cold-rolled strips. Metallurgist. 2020. Vol. 64, Iss. 7-8. pp. 699–708.
24. Tselikov A. I., Nikitin G. S., Rokotyan S. E. Theory of longitudinal rolling. Moscow : Metallurgiya, 1980. 318 p.
25. Zinoviev A. V., Kolpashnikov A. I., Polukhin P. I. et al. Technology of non-ferrous metals and alloys forming. Moscow : Metallurgiya, 1992. 512 p.
26. Zaykov M. A., Polukhin V. P., Zaykov A. M., Smirnov L. N. Rolling process. Moscow : MISiS, 2004. 640 p.
27. Dema R. R., Sinitsky O. V., Chikishev D. N., Kharchenko M. V., Kozhushkov E. Yu. Study of the process of forming the transverse profile and flatness of hot-rolled and cold-rolled strips under the conditions of OJSC Magnitogorsk Iron and Steel Works. Proizvodstvo prokata. 2006. No. 3. pp. 9–14.
28. Shatalov R. L., Perederiy Yu. I., Perederiy S. Yu. Automated workstation of sheet metal rolling technologist. Proizvodstvo prokata. 2003. No. 1. pp. 15–18.
29. Belousov V. B., Tipalin S. A., Kalpin Y. G. How the material thickness affects 0,08% carbon cold-rolled sheet steel. Solid State Phenomena. 2020. Vol. 299. pp 409–417.
30. Tipalin S. A., Belousov V. B., Lyubetskaya S. I. Testing the cross-sectional microhardness in sheets with A 0.08% carbon concentration. Solid State Phenomena. 2021. Vol. 316. pp. 269–275.
31. Shatalov R. L., Lukash A. S., Timin Yu. F. Creation and research of a microprocessor system for monitoring rolling forces on a two-high sheet mill. Metallurg. 2015. No. 10. pp. 70–73.