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Rolling and other Metal Forming Processes
ArticleName Determination of parameters for step-by-step bending of thin sheet metal
DOI 10.17580/chm.2024.01.03
ArticleAuthor N. A. Chichenev, A. O. Karfidov, M. V. Vasilyev, O. N. Chicheneva

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

N. A. Chichenev, Dr. Eng., Prof., Dept. of Process Equipment Engineering, e-mail:
A. O. Karfidov, Head of the Dept. of Process Equipment Engineering, e-mail:
M. V. Vasilyev, Senior Lecturer, Dept. of Process Equipment Engineering, e-mail:
O. N. Chicheneva, Cand. Eng., Associate Prof., Dept. of Computer-Aided Engineering and Design, e-mail:


In the production of thin-walled metal parts, the sheet stamping process is widely used, which is characterized by ease of implementation, high productivity and low operating costs. The issues of determining the parameters of step-by-step bending, which is widely used in the manufacture of thinwalled body parts and whose advantage in comparison with other bending methods is simplicity of implementation and versatility, as well as the absence of special technological equipment and complex deforming equipment, are considered. Step-by-step bending is a method of forming a large bending radius in a sheet metal part by creating a sequential series of V-shaped bends in close proximity to each other. Based on the analysis of the process of stepwise bending of sheet material, dependences are obtained for the bending angle corresponding to one step and for the absolute deviation of the real (polyhedral) outer profile of sheet material during stepwise bending from the given profile in the form of a circle. For the convenience of practical use, the expression for the profile deviation is presented in dimensionless form. The dependence of the bending angle of the stage on the relative stroke (penetration depth into the matrix) of the punch with free (air) bending is obtained, which is used in the development of technological modes of step bending for the production of a number of thin-walled body parts. Recommendations are given on the choice of the number of steps depending on the requirements of the technical specification for the profile of the bent sheet. As an example, the results of calculating the relative and absolute deviation of the polyhedral profile from the number of steps at a bending angle of 90 ° and a bending radius of 100 mm are given; for some cases, the values of the nearest linear dimensional tolerances according to GOST 25346-2013 are shown.

keywords Thin-walled parts, sheet stamping, step-by-step bending, bending angle, sheet metal.

1. Nefedov A. V., Tanchuk A. V., Chichenev N. A. Modification of car tippler drive at Donskoy Mining and Processing Plant. Gornyi Zhurnal. 2022. No. 8. pp. 52–56.
2. Busygin A. M., Stelmakhov A. A. Mathematical model for determining kinematic parameters of a bulldozer ripper mechanism. Proceedings of the 8th International Conference on Industrial Engineering. ICIE 2022. Lecture Notes in Mechanical Engineering. Springer, Cham. pp. 131–141.
3. Bardovskiy A. D., Gorbatyuk S. M., Keropyan A. M., Bibikov P. Ya. Assessing parameters of the accelerator disk of a centrifugal mill taking into account features of particle motion on the disk surface. Journal of Friction and Wear. 2018. Vol. 39, Iss. 4. pp. 326–329.
4. Chichenev N. A. Reengineering of a facility for centering a slab in a roughing mill stand. Metallurg. 2018. No. 7. pp. 76–80.
5. Patrin P. V., Karpov B. V., Aleshchenko A. S., Galkin S. P. Assessment of the technological capabilities of radial-shear rolling of long products from the heat-resistant KhN73MBTYu alloy. Stal. 2020. No. 1. pp. 18–21.
6. Gorbatyuk S. M., Morozova I. G., Naumova M. G. Development of a working model of the process for die steel heat treatment reindustrialization. Izvestiya vuzov. Chernaya metallurgiya. 2017. Vol. 60. No. 5. pp. 410–415.
7. Arabadzhi Ya. N., Olennikov A. S., Kurchukov A. M., Likhacheva T. A. Thickening equipment modernization with supaflo process (Outotec) at Talnakh Concentrator. Tsvetnye Metally. 2018. No. 6. pp. 38–43.
8. Nefedov A. V., Kitanov A. A., Chichenev N. A. Reengineering of the roller hardening machine of the sheet-rolling shop of JSC Ural Steel. Chernye Metally. 2022. No. 5. pp. 22–26.
9. Burdukovsky V. G. Sheet stamping technology : textbook. Yekaterinburg : Izdatelstvo UrFU, 2019. 224 p.
10. Banabic D. Multiscale modeling in sheet metal forming. Heidelberg : Springer, 2016. 405 p.
11. Yakovlev S. S. Forging and stamping. In 4 volumes. Vol. 4. Sheet stamping. Moscow: Mashinostroenie, 2010. 732 p.
12. Konstantinov I. L., Sidelnikov S. B. Forging and stamping production : textbook. Moscow : NITs INFRA-M. 2021. 464 p.
13. Benson S. Bending Basics. Cincinnati : Fabricators & Manufacturers Association, 2017. 581 p.
14. Lenard J. G. Metal forming science and practice. Oxford : Elsevier Science, 2002. 378 p.
15. Hu J., Marciniak Z., Duncan J. Mechanics of sheet metal forming. Oxford-Boston : Butterworth-Heinemann, 2002. 211 p.
16. Efremov D. B., Gerasimova A. A., Gorbatyuk S. M., Chichenev N. A. Study of kinematics of elastic-plastic deformation for hollow steel shapes used in energy absorption devices. CIS Iron & Steel Review. 2019. Vol. 18. pp. 30–34.
17. Samusev S. V., Fadeev V. A., Sidorova T. Yu. Development of effective calibrations for forming sheet blanks for the production of longitudinal electric welded pipes of small and medium diameters. Metallurg. 2020. No. 7. pp. 55–57.
18. GOST 25346–2013. Geometrical product specifications. Code system for tolerances on linear sizes. General provisions, tolerances, deviations and fits. Introduced: 01.07.2015.

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