MATHEMATICAL MODELING OF THE TEMPERATURE FIELD OF WARM ROLLING MILLS ROLLS THAT HAVE AN INTERNAL HEATING SOURCE

Abstract

Recently, a fairly common method of expanding the range of finished steel products is to obtain metal products with given, sometimes unique properties due to the use of warm rolling modes in the temperature range before recrystallization. There are two approaches to implementation of warm rolling process. The first one involves non-invasive heating of the strip before the deformation zone. The second approach prefers additional heating of sheets or strips directly in the deformation zone due to the contact heat exchange with the working rolls preheated to certain temperatures. From the point of view of reconstruction of the existing equipment, convenience and speed of regulation of heating temperature, stability of work and, finally, efficiency and environmental friendliness, the most reasonable is to use internal heating of working rolls. The implementation of this approach is also effective in terms of minimizing oxidative processes. It should be noted that the rolls in such a scheme plays a significant role in the formation of the resulting temperature field of the strip, and, therefore, significantly affect the final properties of the products. The paper presents a mathematical mo-dele of the temperature field of the working rolls of warm rolling mills with an internal heating point. Numerical implementation of the model is carried out on the basis of superposition approach, which provides for the breakdown of the roll cross-section into ij-nodes in the period of time. The results showed significant heterogeneity of temperature distribution both in radius and outer surface, as well as the presence of maximum at the exit from the deformation zone and minimum in the section before it.