Intrai CJSC (Chelyabinsk, Russia):

E. A. Maksimov, Cand Eng., E-mail: maksimov50@mail.ru

At present time, the metal constructions are widely used in the building industry. The metal constructions cover the buildings with the large spans. This is most relevant in the building of the stadium «Luzhniki», stadium «Saint-Petersburg-Arena», industrial buildings, as well as for the high-rise structures «Moscow-City» and «Gazprom». In the construction of these buildings construction beams are widely used. Often sheet metal makes 60 % of the weight of the total construction. In accordance with the adopted technology in the manufacture of the constructional beam from the sheet, the beam is subjected to the operations of leveling. Thus, in accordance with GOST 23119-2012, the tolerances for a flatness of steel sheet with a thickness from 10 mm to 40 mm after leveling on the roller straightening machine (RSM) is no more than 3-10 mm. Under leveling of strips on the RSM, as a rule, there is a decrease in the quality of leveling due to the lack of technological capabilities for straightening of the front end of the strip. Besides, the machines do not have the safeguards from an overload under leveling with an increased force. As a result of an insufficient straightening of the strip’s curvature at the exit of the strip from the machine, the front end of the strip is bent downward below the level of the roll-table. Under leveling, the front section and the rest part of the strip are in the different loading conditions. The strip is located between the rollers of the straightening machine and is like a multi-supporting beam which is loaded with the concentrated forces from the rollers. But the front part of the sheet strip does not rely on the rollers, it is not straightened and keeping the bend down. In this paper, the construction of the device for bending the front end of the strip is developed and improved. The additional safety device for the roller straightening machine is also proposed. The technical characteristics of the roller straightening machine (equipped with a additional device for bending the front end of the strip) and a safety device are given. The methods of a calculation of the main parameters of the devices are also given.

1. Moshnin Е. N. Bending and leveling in rotary machines. Technology and equipment. Moscow: Mashinostroenie, 1967. 272 p.
2. Korolev А. А. Mechanical equipment for rolling and tube shops. Moscow: Metallurgiya, 1987. 480 p.
3. Tselikov А. I., Polukhin P. I., Grebenik V. М. et. Al. Machines and aggregates for metallurgical plants. Vol. 3. Machines and aggregates for production and finishing of rolled metal. Moscow: Metallurgiya, 1988. 432 p.
4. Nedorezov I. V. Modeling processes of rolled metal leveling in roller machines. Yekaterinburg: Akva-Press, 2003. 256 p.
5. Polzer J., Wolff А., Gorgels F., Mücke G., Heβler A. Advanced control system for a form-fit-bending unit. Chernye Metally. 2009. No. 5. pp. 41–44.
6. Shinkin V. N. Calculation of steel sheet’s curvature for its flattening in the eight-roller straightening machine. Chernye Metally. 2017. No. 2. pp. 46–50.
7. Shinkin V. N. Calculation of bending moments of steel sheet and support reactions under flattening on the eight-roller straightening machine. Chernye Metally. 2017. No. 4. pp. 49–53.
8. Maksimov Е. А., Shatalov R. L. Developing centering guide for quality improvement of steel heavy plates in a roller straightening machine. Chernye Metally. 2018. No. 2. pp. 48–52.
9. Maksimov Е. А., Shatalov R. L., Vasilev Yu. S. Refinement of the method for calculation of thick plates leveling parameters in a roller leveling machine. Stal. 2017. No. 1. pp. 35–38.
10. Maksimov Е. А., Shatalov R. L., Ustinovsky Е. P., Brovman М. Ya. Modernization of a roller leveling machine to improve the quality of thick steel plates. Stal. 2017. No. 4. pp. 39–43.
11. Shelest А. Е., Yusupov V. S., Perkas М. М., Sheftel Е. N., Prosvirnin V. V., Akopyan К. E. Development of the method for determining the geometric and deformation parameters of metal sheet straightening in roller machines. Proizvodstvo prokata. 2016. No. 7. pp. 3–8.
12. Shinkin V. N. The mathematical model of the thick steel sheet flattening on the twelve-roller sheet-straightening machine. Message 1. Curvature of sheet. CIS Iron and Steel Review. 2016. Vol. 12. pp. 37–40.
13. Shinkin V. N. Arithmetical method of calculation of power parameters of 2N-roller straightening machine under flattening of steel sheet. CIS Iron and Steel Review. 2017. Vol. 14. pp. 22–27.
14. Skorokhodov V. N., Odessky P. D., Rudchenko V. V. Construction steel. Moscow: Metallurgizdat, 2002. 624 p.
15. Prinsky D. Straightening installation for sheet. MPT International. 2010. No. 3. pp. 58–59.
16. Deli H. Increase of grooved work roll lifetime by innovate coolant and lubricant application. Proceedings of 3rd International Steel Conference. Dusseldorf, 2000. pp. 441–442.
17. Jelale M. New flatness control system at the tandem cold mill. Proceedings of ATS. Paris, 2006. No.9. pp. 203–205.
18. Shinkin V. N. Asymmetric three-roller sheet-bending systems in steel-pipe production. Steel in Translation. 2017. Vol. 47. No. 4. pp. 235–240.
19. Shinkin V. N. Simplified calculation of the bending torques of steel sheet and the roller reaction in a straightening machine. Steel in Translation. 2017. Vol. 47. No. 10. pp. 639–644.
20. Hu J., Marciniak Z., Duncan J. Mechanics of Sheet Metal Forming. Butterworth-Heinemann, 2002. 211 p.
21. Vagmin A. Tata Steel — richtmaschine fur warmbandplatinen in Laser. Stahl und Eisen. 2012. No. 3. pp. 30–31.
22. Maksimov E. A., Shatalov R. L. Asymmetric deformation of metal and front flexure of thick sheet in rolling. Part 1. Steel in Translation. 2012. Vol. 42, No. 5. pp. 442–446.
23. Maksimov E. A., Shatalov R. L. Asymmetric deformation of metal and front flexure of thick sheet in rolling. Part 2. Steel in Translation. Vol. 42. No. 6. pp. 521–525.
24. Shatalov R. L., Maksimov E. A., Babkin A. G. Adjustment of rolling mills to produce flatter steel strip. Steel in Translation. 2011. Vol. 41, No. 10. pp. 845–848.
25. GOST 1497-84. Metals. Methods of tension test. Introduced: 01.01.1986.