直拉式可逆冷轧实验轧机张力控制技术

直拉式可逆冷轧实验轧机的张力控制仅使用张力反馈进行闭环控制无法兼顾速度匹配和张力稳定的要求.研究发现采用速度前馈加张力反馈的组合控制技术,可以很好地解决这一问题.前馈控制器是根据轧制速度设定值计算伺服阀流量设定值,进而计算出伺服阀开口度.反馈控制采用一个PI控制器,根据张力偏差,计算伺服阀开口度.将前馈和反馈控制量叠加后作为张力液压缸伺服阀开口度的总设定值.该技术在某450mm直拉式冷轧实验轧机的张力控制中取得了很好的效果.

Tension Control Technique for Hydraulic-Tension Reversible Experimental Cold Mill

Only a tension feedback closed loop controller cannot meet the requirements of the speed synchronizing between hydraulic-tension cylinder and workpiece and keeping the stable tension at the same time for hydraulic-tension reversible experimental cold mill.To solve the problem,a new combined control technique was proposed by combining a speed feedforward controller with a tension feedback controller.The feedforward controller computes the setting flux according to the setting rolling speed,and then computes the opening scale of servo valve.The feedback controller uses a PI controller to compute the opening scale of servo valve.The outputs of feedforward and feedback controller were summed as the total opening scale of servo valve.The proposed technique was applied successfully in a 450 mm hydraulic-tension experimental cold mill.