Optimization of roll contour for a temper mill in a continuous annealing line

A study on stripe shape rolled with a temper mill in a continuous annealing line was done. Through analyzing production data, based on the ideas of both reducing the unfavorable contact area and improving the roll bending force control ability, the optimization objectives of backup roller contour in the temper mill were proposed by using the influence function method to calculate the elastic deformation of the roller system. A lexicographic method was adopted to cope with the multi-objective function, the optimal calculation was implemented by a hybrid genetic algorithm, and a new plan for roll contour configuration was offered. A finite element model of the roller system was established by the 2-dimensional varying-thickness theory to calculate and collate the roll gap horizontal rigidity and the roll bending force control ability. After the result is applied to real production, the stripe shape control effect of the temper mill is improved and the roll bending burden is decreased.