Abstract
The mathematical model of the process of rolling a continuous cast billet with defects of macrostructure on a smooth barrel and in calibers is presented. The boundary conditions are given by the speed of rotation of the rolls, the restriction of degrees of freedom of the workpiece and the rolls, as well as the coefficient of friction on the contact surface of the rolls-workpiece. For hot rolling, it was considered permissible to consider rolling rolls as a rigid, non-deformable rigid body. For the workpiece material used an elastic-plastic model of environmental behavior. There have been two cases considered: rollerless rolling on a smooth barrel and rolling in rectangular caliber. The roll material is steel, the surface is smooth. On the example of rolling in the first pass of the crimp mill, a comparative analysis of caliber rolling and rolling in calibers was carried out. It is shown that rolling on a smooth barrel has the potential to be used in the case of rolling continuous casting with macrostructure defects. The influence of the basic rolling parameters: absolute compression and temperature on the "healing" of macrostructure defects is made.
Highlights
Наведено та створено математичну модель процесу прокатки безперервнолитої заготовки з дефектами макроструктури на гладкій бочці і в калібрах
In relation to production conditions metal rolling from continuous cast billets (CCB) obtained in conditions: – high-speed varietal caster with small bending radius, average figures of marriage by type have the form: violations of the geometry of the CCB — 36.4%; – macrostructure defects — 17.2%, cracks 31.9%; – slag inclusions — 4.5% [2]
Questions related to the study the behavior of defects in the macrostructure of continuously cast billets in the process deformations are relevant following the behavior of these defects in recently widespread mathematical methods simulation using software complexes like ANSYS, DEFORM, QFORM, PLAST, etc. in which modeling carried out using the finite method elements
Summary
Наведено та створено математичну модель процесу прокатки безперервнолитої заготовки з дефектами макроструктури на гладкій бочці і в калібрах. Доведено що прокатка на гладкій бочці має потенціал для використання в разі прокатки безперервнолитої заготовки з дефектами макроструктури. The aim of the work was to develop a mathematical model and conduct research into the behavior of defects in the macrostructure of continuously cast metal during rolling. Formulation of the purpose of the study For mathematical modeling of the behavior of macrostructure defects during rolling, a computer simulation software package using the Deform-3D finite element method was used. Central porosity was modeled through a hole with a diameter of 4, 6 and 8 mm
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