Rolling and Heat Treatment  
ArticleName  Influence of technological parameters of rolling in universal stands on the process of metal displacement from the edges to the longitudinal axis of the roll. Part 2. Critical point 
ArticleAuthor  A. V. Polyakov, R. Shatshu Netshunzim, I. P. Mazur 
ArticleAuthorData  Lipetsk State Technical University (Lipetsk, Russia): A. V. Polyakov, Postgraduate Student, email: Pool_Akov@mail.ru 
Abstract  When alternating reduction in vertical and horizontal rolls, occurring in a roughing group of continuous widestrip hot rolling mills, the metal transitions from the lateral edges and ribs of a slab to horizontal surfaces of the hotrolled breakdown. In this case, the metal in the edge region is shifted to the longitudinal axis of the hotrolled breakdown. The magnitude of the metal movement, and with them the edge defects formed on the continuously cast slab, on the horizontal surfaces of the hotrolled breakdown directly affects the value of the side trim in subsequent technological operations. In this paper, the processes of metal flow in the edge area during reduction in the universal roughing stand are considered. The influence of a number of technological parameters and modes of adjustment of the vertical rolls operation, such as the value of side reduction, the friction coefficient and the speed mode of vertical rolls, on the value of metal displacement to the longitudinal axis of the hotrolled breakdown is investigated. The critical point at which the metal displacement changes its direction is described. The studies were carried out using a mathematical model of slab reduction based on the finite element method using the SIMULIA ABAQUS software package. 
keywords  Hot rolling, roughing group of stands, reduction of slabs, edge defects, rolled crack, mathematical modeling, finite element method 
References 
1. Xianghua L., Hailiang Y., Changsheng L. Behaviour of corner surface cracks in VH rolling process of steel slabs. Paper presented at the 9^{th} International Steel Rolling Conference, CNIT ParisLa Defense, June 19–21, 2006. pp. 45–54.

Language of fulltext  russian 
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