Novolipetsk Iron and Steel Works, Lipetsk, Russia:

D. A. Kovalev, Cand. Eng., Director of the Directorate for the Development of New Process Technologies
V. A. Pimenov, Cand. Eng., Head of Technological Projects
M. A. Dagman, Senior Engineer, e-mail: dagman_ma@nlmk.com

Lipetsk State Technical University, Lipetsk, Russia:
S. M. Belsky, Dr. Eng., Prof. of the Dept. of Metal Forming
I. P. Mazur, Dr. Eng., Prof., Head of the Dept. of Metal Forming

Formation of the cross-sectional profile of cold-rolled strips during rolling is influenced by a number of factors: the cross-sectional profile of the ingoing strip, machine roll profiling, temperature profile, bending and flattening of the work rolls, as well as their wear. Taking into account the degree of influence of factors on the formation of an active generatrix, the main attention in this message is paid to flattening of work rolls. A number of methods for evaluating the elastic flattening of rolls along the length of the barrel are considered, and an analysis is made of the influence of the features of roll flattening in edge zones on the transverse profile shape. A method for calculating elastic flattening based on the Boussinesq solution with Nakajima – Matsumoto refinements was chosen and used as the basis for a complex model for predicting the transverse profile. The use of the model will make it possible to estimate with high accuracy the effect of rolling parameters on the transverse profile and, on this basis, effectively control the technological and production process, including planning taking into account the required width of the edge to be trimmed, selection of cold rolling modes, etc. for maximum metal savings.

1. Yamamoto A. Cold Rolling mill Technologies for Electrical Steel. Proceeding of the Iron & Steel Technology Conference. Nashville, Tenn., USA. 2021. pp. 728–735.
2. Belskiy S. М., Shopin I. I., Mazur I. P., Dagman М. А. Edge drop of GO steel strips at the hot rolling mill 2000 PJSC “NLMK”. Chernye Metally. 2022. No. 6. pp. 15–19.
3. Stoyakin А. О. Investigation of the formation of wedge- and camber- shaped hot-rolled steel strips to increase the stability of the rolling process: Dissertation… of Candidate of Engineering Sciences. LGTU. Moscow, 2018. p. 141.
4. Pimenov V. А., Belskiy S. М., Kuznetsova Е. V., Shkarin А. N. Mathematical model for identifying the shape of the cross-sectional profile of hot-rolled strips and the distribution of elongations over the width of cold-rolled strips. Message 1. Proizvodstvo prokata. 2018. No. 1. pp. 11–15.
5. Fukushima S., Sasaki T., Buei Y. еt al. High-accuracy profile prediction model for mixed scheduled rolling of high tensile strength and mild steel in hot strip finishing mill. Nippon Steel & Sumitomo Metal Technical Report. 2016. No. 111. pp. 3–10.
6. Kitamura K., Yarita I., Suganuma N. еt al. Edge-drop control of hot and cold rolled strips by a tapered-crown work roll shifting mill. Kawasaki Steel Report. 1992. No. 27. pp. 5–12.
7. Yanlin Li, Jianguo Cao, Lan Qui еt al. Effect of strip edge drop of electrical steel on profile and flatness during hot rolling process. Advances in Mechanical Engineering. 2019. Vol. II, Iss. 4. pp. 1–11.
8. Matveev B. N. Exact accounting of elastic flattening of rolls during determination of rolling parameters for thin strips (on publications of Japanese scientists). Proizvodstvo prokata. 2006. No. 2. pp. 15-19.
9. Timoshenko S. P., Goodier J. Theory of elasticity. Moscow : Nauka, 1979. 560 p.
10. Johnson К. Contact mechanics. Moscow : Mir, 1989. 510 p.
11. Pimenov V. А., Kovalev D. А., Dagman М. А., Mazur I. P. Development of mathematical models for formation of the cross profile of strips during hot rolling, taking into account the wear of rolls. Chernye Metally. 2021. No. 10. pp. 13–19.
12. Pimenov V. A., Dagman A. I., Kovalev D. A. Analysis and mathematical simulation of formation regularities of strip transversal profile during ho rolling. Steel in translation. 2020. Vol. 50. No. 2. pp. 107–111.
13. Shinkin V. N. Preliminary straightening of steel strip. Chernye Metally. 2018. No. 5. pp. 34–40.
14. Muhin U., Belskij S., Koynov T. Study of the influence between the strength of antibending of working rolls on the widening during hot rolling of thin sheet metal. Frattura ed Integrita Strutturale. 2016. Vol. 10. No. 37. pp. 318–324.
15. Roberts W. L. Cold rolling of steel. Marcel Dekker, 1978. 799 p.
16. Ginzburg V. B. Metallurgical design of flat rolled steels. Marcel Dekker, 2005. 726 p.