Designing of induction heaters for the edges of pre-rolled wide ultrafine sheets and strips correlated with the chilling end-effect

摘要

The article provides the analysis of the structures of broadband hot rolling mills that confirmed the relevance of the use of induction heating of the pre-roll edges before the finishing mills in order to reduce the chilling end-effect. Adaptation to the production conditions of wide ultrafine sheets and strips of finite-difference recurrence mathematical model of temperature field variation allowed to develop recommendations for designing of slot inductors for reheating the edges of pre-rolled strips, taking into account the chilling end-effect of the edges, heating modes to achieve the required temperature distribution before rolling in the finishing mill groups. Calculations show that the temperature gradient across the strip width is from 30 to 150 Celsius degrees, depends on the time interval between the end of the rough rolling and the beginning of the deformation of the metal in the finishing mill. Special design of slot inductors makes possible to eliminate a temperature gradient.