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

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

After the hot rolling, the steel sheets are deforming during cooling due to the residual stresses and often have the surface defects in cold condition (for example, buckles, wavy edges, camber, crossbow, coil set and so on). Therefore, the steel sheets are flattened in the multi-roller straightening machines. The process of sheet’s straightening in the multi-roller flattening machines is mandatory (required) process for the technological processes of metallurgical production. The sheet flattening is widely used at Russian metallurgical plants (for example, in Vyksa, Chelyabinsk, Magnitogorsk, Izhora and so on) and at overseas metallurgical plants (in US, Germany, China, India and so on). The main task of the technology of the steel sheet straightening is to calculate the optimal reduction of a sheet billet by the working rollers of straightening machines so that the sheet at the outlet from the machine has the minimum residual stress and curvature. The mathematical method for the determining of the optimal technological parameters of the cold straightening of the thick steel sheet on the eight-rolled sheet-straightening machine is proposed in this paper. The calculations allow us to determine the type and the curvature of the neutral line of the steel sheet under the straightening, as well as the residual curvature sheet after the fl attening depending on the rolls’ radius, the pitch between the straightening machines’ working rolls, the magnitude of the sheet reduction by the upper rollers, the sheet thickness, as well as the elastic modulus, the yield stress and the hardening modulus of the sheet metal. The results of the research can be used at the engineering and metallurgical plants.

1. Davim J. P. Materials Forming and Machining. Research and Development. Woodhead Publishing, 2015. 202 p.
2. Banabic D. Sheet metal forming processes. Constitutive modelling and numerical simulation. Springer, 2010. 301 p.
3. Lenard J. G. Metal Forming Science and Practice. Elsevier Science, 2002. 378 p.
4. Hu J., Marciniak Z., Duncan J. Mechanics of Sheet Metal Forming. Butterworth-Heinemann, 2002. 211 p.
5. Mazur I., Koinov T. Quality control system for a hot-rolled metal surface. Journal of Chemical Technology and Metallurgy. 2014. Vol. 49, No. 1. pp. 71–76.
6. Cherkashina T. I., Mazur I. P., Aksenov S. A. Soft reduction of a cast ingot on the incomplete crystallization stage. Materials Science Forum. 2013. Vol. 762. pp. 261–265.
7. Astakhov A. A., Dunaev D. N., Mazur I. P. Machining profiling of the working rolls as a way to control cross-section of the rolled steel. Materials Science Forum. 2013. Vol. 762. pp. 337–342.
8. Shinkin V. N., Kolikov A. P. Simulation of the shaping of blanks for large-diameter pipe. Steel in Translation. 2011. Vol. 41, No. 1. p. 66.
9. Shinkin V. N., Kolikov A. P. Elastoplastic shaping of metal in an edgeending press in the manufacture of large-diameter pipe. Steel in Translation. 2011. Vol. 41, No. 6. pp. 528–531.
10. Shinkin V. N., Kolikov A. P. Engineering calculations for processes involved in the production of large-diameter pipes by the SMS Meer technology. Metallurgist. 2012. Vol. 55, Nos. 11–12. pp. 833–840.
11. Hu P., Ma N., Liu L.-Z., Zhu Y.-G. Theories, methods and numerical technology of sheet metal cold and hot forming. Analysis, simulation and engineering applications. Springer, 2013. 120 p.
12. Banabic D. Multiscale modeling in sheet metal forming. Springer, 2016. 405 p.