National University of Science and Technology “MISIS” (Moscow, Russia)

V. N. Shinkin, Dr. Phys.-Math., Professor, e-mail: shinkin-korolev@yandex.ru

The increased interest in the production of large-diameter bimetallic thick-walled pipes with an internal coating of anti-corrosion steel makes the problem of studying the deformations of a bimetallic sheet during bending on presses and rollers urgent. A feature of the deformation of such bimetallic sheets is additional bending due to the heterogeneity of the mechanical characteristics of the metal of the sheet wall. The difference in the values of Young’s modulus, yield strength and strength, as well as the linear coefficients of thermal expansion of the substrate metal and the coating of the bimetallic sheet, leads to a displacement of the neutral surface of the bimetallic sheet from its median surface. As well to additional bending of the neutral surface of the bimetallic sheet, after its elastic plastic bending. In metallurgy, the elastic-plastic bending of a steel sheet is the basis of the forming process of a pipe billet on stepby-step molding presses, edge bending presses and rollers in the production of large-diameter pipes. In this paper, a mathematical model is constructed for calculating the residual curvature of a bimetallic sheet after elastoplastic bending of its longitudinal edges on an edge bending press.

1. Shinkin V. N. Continuum mechanics for metallurgists. Moscow: MISiS, 2014. 628 p.
2. Shinkin V. N. Tube billet’s shaping on the pre-shaping press by means of punch with flat bottom. CIS Iron and Steel Review. 2021. Vol. 21. pp. 47–51.
3. Shinkin V. N. Roller bending of edges of steel tubal billet. Part 1. Two-radius profile of rolls. Chernye Metally. 2024. No. 10. pp. 75–78.
4. Liu C., Dong Z., Ma L., Hou X., Qiao N. Research on optimization of basic rail top bending prediction model. Scientific Reports. 2024. Vol. 14. No. 1. Article ID 9844.
5. Dong Z., Liu C., Ma L., Yang J., Jiang Y. Four-point bending of basic rails: theory and experimental verification. Symmetry. 2024. Vol. 16. No. 6. Article ID 767.
6. Zhao J., Zhou C. L., Wei D., Wang T. Х., Liao X., Zhao Y. S. Refinement of curvature calculation of stainless steel ultra-thin strip in tensile bending. Suxing Gongcheng Xuebao/Journal of Plasticity Engineering. 2023. Vol. 30, No. 10. pp. 160–166.
7. Belskiy S. M., Shopin I. I. Statistical regression analysis of breakages in cold rolling. IOP Conference Series: Materials Science and Engineering. 2020. Vol. 969. No. 1. Article ID 012074.
8. Safronov A. A., Shopin I. I., Belskiy S. M. Influence of the variation of mechanical properties and thickness in hot-rolled strips of electrical anisotropic steel to stabilize cold rolling. Metallurgist. 2023. Vol. 66. pp. 1557–1561.
9. Boazu D., Gavrilescu I., Stan F. Analytical and finite element analysis of the rolling force for the three-roller cylindrical bending process. Materials. 2024. Vol. 17. No. 21. Article ID 5230.
10. Wang Y., Shen H., Wu J., Yan H., Xu S. Reinforcement-learning-based composite optimal control for looper hydraulic servo systems in hot strip rolling. IEEE/ASME Transactions on Mechatronics. 2023. Vol. 28. No. 5. pp. 2495–2504.
11. Goncharuk A. V., Fadeev V. A., Kadach M. V. Seamless pipes manufacturing process improvement using mandreling. Solid State Phenomena. 2021. Vol. 316. pp. 402–407.
12. Demyanenko E. G., Popov I. P., Nikonov D. A. Determination of the area of workpiece destruction during the deep drawing into a conical die. Russian Aeronautics. 2024. Vol. 67. No. 1. pp. 161–169.
13. Song D. L., Zhang Y. C., Du J. F., Yi X. C., Sun Y. B., Cui Y. H. Deformation analysis and parameters optimization for tension-bending leveling of strip. Suxing Gongcheng Xuebao/Journal of Plasticity Engineering. 2021. Vol. 28, No. 10. pp. 84–90.
14. Feoktistov S. I., Andrianov I. K. Analytical description of the Bauschinger effect using experimental data and the generalized Masing principle. Materials Physics and Mechanics. 2024. Vol. 52. No. 1. pp. 49–59.
15. Harangozo D., Czinege I. Effect of roller levelling on tensile properties of aluminum sheets. Materials. 2023. Vol. 16. No. 8. Article ID 3001.