SHISHOV Ivan St.Petersburg State Polytechnical University

Spoluautoři KOLBASNIKOV Nikolay

It is well-known that the final structure and mechanical properties of plates are largely determined by the metal stress-strain state in the deformation zone during rolling. Rough rolling is often performed at high deformation zone characterized by extremely irregular distribution of stress and strain fields. In addition, rough rolling is always accompanied by considerable plate temperature field irregularity, which obviously can significantly affect on the metal stress-strain state tonality in the deformation zone. In order to investigate this effect the problem of plate hot rolling on mill 5000 JSC "Severstal" was solved by finite element modeling in Deform-3D. Thickness ratio of the heated central metal layers (called the nucleus) and cold surface layers (called incrustations) was accepted as quantitative characteristics of temperature field irregularity. It was shown by Deform-3D calculations that the higher the thickness and the lower the temperature of incrustations, the more intense decreasing central metal layers tensile stress with increasing reduction. Furthermore, the presence of cold surface layers greatly increases the strain rate in the central layers of the plate thickness, which can greatly improve the quality of metal. The quantitative relations between the basic parameters of rolling and intensity of deformation in the plate central layers of roll considering the plate temperature field irregularity were obtained. It provides additional control over the quality of rolled products, in particular, the uniformity of structure and mechanical properties in thickness.

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