六辊冷轧机的弯辊力组合板形控制策略

Shape control strategy by bending force combination adjustment for 6-hi cold rolling mill

针对现有六辊轧机对使用两组弯辊力进行四次板形控制的理论不足,提出了弯辊力组合板形控制策略.利用Marc有限元仿真计算软件建立辊系--轧件耦合模型,分析工作辊弯辊力与中间辊弯辊力板形调控特性的差别.在此基础上通过理论推导,建立了弯辊力组合板形控制策略的两种实现方式——在线闭环控制模型与基于弯辊力组合系数的设定参数在线调节方法.现场应用结果表明,弯辊力组合板形控制策略能够充分利用工作辊弯辊力与中间辊弯辊力板形调控特性的差别进行配合调节,对长期困扰生产的四次板形缺陷实施快速精确的控制.

A shape control strategy by bending force combination adjustment for 6-hi cold rolling mills was proposed to solve the theoretical insufficiency of 4-order shape defect control by two kinds of bending forces. A roll-strip coupling model was established with Marc finite element simulation software, and the difference of shape control characters was analyzed between work roll bending force and intermediate roll bending force. Two methods for implementing the shape control strategy, which are the on-line closed-loop control model and the on-line setting parameter adjustment method based on bending force combination coefficients, were introduced by theo-retical derivation. It is proved by field application that with the shape control strategy, the difference of shape control characters be-tween work roll bending force and intermediate roll bending force is fully utilized and the combination adjustment is realized to precisely control 4-order shape defects, which perplex production for a long time.