冷连轧末机架厚度控制策略的优化

Strategy Optimization of Final Stand Gauge Control for Tandem Cold Mill

五机架冷连轧机末机架采用轧制力闭环控制模式时，会出现4^#机架负荷过大以及4^#～5^#机架间张力控制精度低等问题，继而对厚度控制精度造成影响。为了在保证末机架轧制力控制精度的前提下提高厚度控制精度，提出了末机架厚度控制优化策略。通过建立动态轧制力补偿控制器与动态负荷平衡控制器，补偿了速度调节对张力以及厚度控制的影响，并实现了各机架的负荷分配的平衡。现场实际应用效果表明，在实现末机架高精度轧制力控制的同时，优化了4^#机架负荷，且成品厚度控制精度均远优于＋1％。该优化策略满足了冷连轧厚度控制的要求。

The overload of stand 4 and low tension control accuracy between stand 4 and stand 5 were caused, and then the gauge control accuracy was influenced, since the rolling force control closed-loop mode for final stand was adopted in five-stand tandem cold mill. In order to improve gauge control accuracy under the premise of high rolling force control accuracy for final stand, an optimized strategy for last stand gauge control was proposed. By building up dynamic rolling force compensation controller and dynamic load balance controller, the effects of speed adjustment on tension and gauge were compensated, and the load distribution of stands was balanced. The practical application results show that the high accuracy control result of final stand rolling force is achieved, and the load of stand 4 is optimized. In addition, the gauge control accuracy of product is better than ± 1%. This optimized strategy can satisfy well the need of gauge control of tandem cold mill.