Increase in Efficiency of Heat Treatment of Large-Sized Mill Rolls by Simulating Thermal Conditions of Hardening

The paper offers a review of the current technologies of induction heating utilized during heat treatment of mill rolls. It is shown that designing the equipment and heat treatment technology with induction heating of the mill rolls is important, first of all, to ensure high quality of heat treatment. In this case, it is necessary to comply with the following requirements: provide minimum deviations of hardness from the required values along the length of the roll body and through the depth of the hardened layer, and eliminate dangerous (thermal and structural) stresses leading to roll destruction during or after the heat treatment. These problems cannot be resolved without computer simulation. A universal method of digital design and control of thermal conditions of the induction heating equipment is considered, which ensures high quality of heat treatment of the rolls.