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80th anniversary of the dept. “Materials Processing and Additive Technologies” of Moscow Polytechnic University
ArticleName Study of the process of bending long sheet products with selection of pressure dies based on computer modeling
DOI 10.17580/chm.2023.11.07
ArticleAuthor D. A. Gnevashev, Sh. F. Orudzhev
ArticleAuthorData

Moscow Polytechnic University, Moscow, Russia

D. A. Gnevashev, Cand. Eng., Head of the Dept. of Materials Forming and Additive Technologies, e-mail: dengnevashev@mail.ru
Sh. F. Orudzhev, Master's Student, Dept. of Materials Forming and Additive Technologies, e-mail: shamil-orudzhev@rambler.ru

Abstract

Bending sheet metal on sheet-bending machines is one of the most common metalworking methods, which makes it possible to produce spatial parts with permanent connections without welding two or more elements located in different planes. In this case, the bend itself represents a rounded corner, the radius of which should not be less than the permissible value. During the bending process, the metal sheet on the bending line is deformed with tension on the outer surface and compression on the inner side of the corner. This changes the crystal lattice structure and can lead to its destruction in places of overstress. Such overstress due to strong bending of the sheet leads to its fracture along the fold line. Thus, for safe bending of sheet metal, it is necessary to select a value for the bending radius such that tension outside the corner and compression inside it do not lead to critical overstress, and the metal itself retains its strength on the bend. Compliance with the minimum radius when bending metal sheets leads to the need to take it into account when choosing the length of the sheet blank. The bending process is also influenced by the shape and design of the bending tool. The possibility of multi-point bending was studied using the example of a sheet product made of 08kp material under conditions of a shortage of bending tools. The features of multi-point bending of long products on modern equipment ar eshown and the process of ensuring the required accuracy of their parameters as a whole, including the corresponding stages of the product life cycle, is presented. Using mathematical modeling, a study was carried out on the bending of long products under conditions of a shortage of bending tools, and the data obtained were confirmed by practical work.

keywords Bending of 08kp sheet metal, modeling of the bending process, multi-point bending, stress-strain state during bending
References

1. Burdukovsky V. G. Sheet stamping technology : textbook. Ekaterinburg : Izdatelstvo Uralskogo universiteta, 2019. 224 p.
2. Romanovsky V. P. Handbook on cold stamping. Leningrad : Mashinostroenie, 1979. 520 p.
3. Zubtsov M. E. Sheet stamping : textbook for universities. Leningrad : Mashinostroenie, 1980. 432 p.
4. Matveev A. D. Plastic bending of a sheet with constant thickness. Izvestiya vuzov. Mashinostroenie. 1983. No. 1. pp. 12–18.
5. Tipalin S. A. Numerical study of the process of plastic bending of variants of a bimetallic strip with the 12Kh18N10Т-AMG6 composition. Tekhnologiya legkikh splavov. 2016. No. 1. pp. 144–149.
6. Tipalin S. A., Saprykin B. Yu., Kalpin Yu. G., Kopylov S. A. Bending of sheet metal in a polymer bend die. Izvestiya Tulskogo gosudarstvennogo universiteta. Tekhnicheskie nauki. 2023. No. 2. pp. 604–608.
7. Levashova E. L., Radkevich M. M., Yakovitskaya M. V. Increasing the dimensional accuracy of complex profile products made of sheet metal using the free bending method. Nauka i Bizness: puti razvitiya. 2022. No. 7. pp. 153–157.
8. Tipalin S. A., Petrov M. A., Morgunov Yu. A. Theoretical investigation of the bending process of the pre-strained metal sheet. Solid State Phenomena. 2020. Vol. 299. pp. 351–357.
9. GOST 1050–88. Carbon structural quality steel gauged bars with special surface finish. General specifications. Introduced: 01.01.1991.
10. EN 10111:2008. Continuously hot-rolled low-carbon steel sheets and strips for cold forming. Technical delivery conditions. Introduced: 01.06.2008.
11. EN 10083:2007. Quenched and tempered steel. Introduced: 01.01.2007.
12. Miksza M., Bohdal Ł., Kośka K. Numerical analysis of the V-die bending process of the zinc coated DC01 steel. Journal of Mechanical and Energy Engineering. 2021. Vol. 5, Iss. 45. No. 2. pp. 87–94.
13. Mulidrán P., Spišák E., Tomáš M., Rohal V., Stachowicz F. The springback prediction of deep – drawing quality steel used in V-bending process. Acta Mechanica Slovaca. 2019. Vol. 23, Iss. 4. pp. 14–18.
14. Zhigulev G. P., Skripalenko M. M., Fadeev V. A. Modelling of the sheet forming while 3-roller bending process. CIS Iron and Steel Review. 2022. Vol. 23. pp. 45–49.
15. Bakhshi-Jooybari M., Rahmani B., Daeezadeh V., Gorji A. The study of spring-back of CK67 steel sheet inV-die and U-die bending processes. Materials & Design. 2009. Vol. 30, Iss. 7. pp. 2410–2419.
16. Mohammadi S. V., Parsa M. H., Jalali Aghchai A. Effect of the thickness distribution and setting condition on springback in multi-layer sheet bending. International Journal of Engineering. Science and Technology. 2011. Vol. 3, Iss. 4. pp. 225–235.
17. Antony J. Design of Experiments for Engineers and Scientists. Elsevier, 2003. 190 p.
18. GOST 30893.2–2002. Basic norms of interchangeability. General tolerances. Tolerances of form and position for features without individual tolerance indications. Introduced: 01.01.2004.
19. GOST 10905–86. Surface plates and face-plates. Specifications. Introduced: 01.01.1987.

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