Determination of continuously casting blooms at the stage of incomplete crystallization in crossed profiled rolls

Abstract

In practice, there are some original technical solutions for implementing the method of soft reduction of continuously casting blooms. In this paper we describe a new two-stage process of deformation of continuously blooms on the stage of incomplete crystallization in crossed rolls, developed at the Department of Metal Forming, Donetsk National Technical University. The results of studies implemented by mathematical modeling applied to the conditions of production of continuously casting blooms section 335x400 mm and content of the liquid-solid phase in the range 50...60%. The results of the current research carried out by using the developed mathematical model, implemented using finite-element scheme, allowed to perform the estimate formed by the stress-strain state in six longitudinal vertical sections, and clarify the mechanism of influence of process parameters of strain and size grading of the working tool on the resulting physical and geometrical condition of continuously casting bloom. The rational parameters of the deformation process, ensure a minimum level of occurrence of discontinuities. In addition, it is shown that the presence of the second stage will receive the correct geometric shape of continuous bloom. Studies have shown that a new strain can both manage the process of penetration of deformation in the metal adjacent to the crystallization front and to the dynamic regulation of band width of deformation. It is shown that the effectiveness of a new way of not less than 15% higher than in the case of deformation bloom smooth rollers with a classical one-step scheme of deformation.