Method for preventing lateral bending of board in rough rolling process

The invention discloses a method for preventing lateral bending of a board in the rough rolling process. According to the method for preventing lateral bending of the board in the rough rolling process, lateral bending of a rolled piece is eliminated by automatically adjusting the deviation values of roller gaps in the two sides of a rolling mill. The method for preventing lateral bending of the board in the rough rolling process comprises the following steps of A, lateral bending detection; B, calculation of a lateral bending angle and the lateral bending direction based on lateral bending detection; C, calculation of the deviation values of the roller gaps based on the lateral bending angle and the lateral bending direction of the rolled piece; D pre-setting of the deviation values of the roller gaps between passes; E, automatic adjustment of the deviation values of the roller gaps in the passes; F, self-learning of preset adjustment factors of the deviation values of the roller gaps. By the adoption of the method for preventing lateral bending of the board in the rough rolling process, lateral bending of medium and thick boards can be found in time in the multi-pass reversible rolling process of the medium and thick boards, and lateral bending of the rolled piece is eliminated by adopting a proper roller gap deviation value adjusting strategy.