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

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

Calculation of energy-power parameters of the multi-roller sheet-straightening machines is an important technological estimation at the steel sheet flattening. The basis of energy-power calculation includes estimation of the steel sheet’s bending moments under flattening and the total support reactions of working rollers (the efforts of the upper and lower rollers’ cassettes) of straightening machine. When there is an insufficient bending moment of steel sheet, it is impossible to eliminate the harmful residual stresses in the sheet wall and the surface defects of the sheet. If the force of the upper cassette rollers is insufficient, it is impossible to achieve the desired compression of the sheet for the quality flattening. The excessive values of the rollers’ torque moments and the efforts of rollers’ cassettes often lead to forming of the sheet defects, breakage of the working and supporting rollers and whole sheetstraightening machine. 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. Calculations allow us to determine support reactions of the working rollers, residual stresses in steel sheet, part of plastic deformation through sheet thickness and relative deformation of longitudinal sheet surface fibers during flattening depending on the rollers’ radius, pitch between the straightening machines’ working rolls, magnitude of sheet reduction by the upper rollers, sheet thickness, 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. Hingole R. S. Advances in metal forming. Expert system for metal forming. Springer, 2015. 116 p.
2. Lim Y., Venugopal R., Ulsoy A. G. Process control for sheet-metal stamping process modeling, controller design and stop-floor implementation. Springer, 2014. 140 p.
3. Klocke F. Manufacturing processes 4. Forming. Springer, 2013. 516 p.
4. Lin J., Balint D., Pietrzyk M. Microstructure evolution in metal forming processes. Woodhead Publishing, 2012. 416 p.
5. Frank V. (Ed.) Lecture notes in production engineering. Springer, 2013. 211 p.
6. Belskiy S. M., Yankova S., Chuprov V. B., Bakhaev K. V., Stoyakin A. O. Temperature field of stripes under hot rolling. Journal of Chemical Technology and Metallurgy. 2015. Vol. 50. No. 6. pp. 613-616.
7. Belskiy S., Mazur I., Lezhnev S., Panin E. Distribution of linear pressure of thin-sheet rolling across strip width. Journal of Chemical Technology and Metallurgy. 2016. Vol. 51. No. 4. pp. 371-378.
8. Calladine C. R. Plasticity for engineers. Theory and applications. Woodhead Publishing, 2000. 328 p.
9. Chakrabarty J. Theory of plasticity. Butterworth-Heinemann, 2006. 896 p.
10. Shinkin V. N. Geometry of steel sheet in a seven-roller straightening machine. Steel in Translation. 2016. Vol. 46. No. 11. pp. 776–780.
11. Shinkin V. N. Preliminary straightening of thick steel sheet in a seven-roller machine. Steel in Translation. 2016. Vol. 46. No. 12. pp. 836–840.
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. No. 2. pp. 37–44.
13. Shinkin V. N. The mathematical model of the thick steel sheet flattening on the twelve-roller sheet-straightening machine. Message 2. Forces and moments. CIS Iron and Steel Review. 2016. Vol. 12. No. 2. pp. 40–44.
14. Qin Y. Micromanufacturing engineering and technology. William Andrew, 2015. 858 p.
15. Chakrabarty J. Applied plasticity. Springer, 2010. 758 p.
16. Wilko C. E. Formability. A review of parameters and processes that control, limit or enhance the formability of sheet metal. Springer, 2011. 112 p.