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板带轧机中的厚度自动控制油缸,是调节辊缝位置、控制轧制力大小、实现APC、PGC功能的执行机构。油缸要动作灵敏,定位准确,摩擦力小,才能较好地完成所承担的任务。当从油缸中取压力反馈信号时,如油缸的摩擦力为轧制力的2％,在2000t轧制力、轧机刚度为1/500mm/t的情况下,就会给辊缝位置带来2000×0.02×1/500=0.08mm的误差。可见摩擦力过大会降低油缸的灵敏度和精度,使板带成品的纵向误差加大;同时这种非线性的摩擦力还会引起压力反馈系统的低频振荡,而这种振荡又很难采用理想的校正环节来加以消除,因此降低了系统的动态品质。 1.油缸摩擦力的产生
The strip thickness control cylinder in the rolling mill is an actuator that adjusts the position of the roll gap and controls the rolling force and realizes the APC and PGC functions. Cylinder to move sensitive, accurate positioning, small friction, in order to better fulfill the task. When taking the pressure feedback signal from the cylinder, if the friction force of the cylinder is 2% of the rolling force, it will bring 2000 to the roll gap position under the condition of 2000t rolling force and mill rigidity of 1 / 500mm / t × 0.02 × 1/500 = 0.08mm error. Visible friction assembly will reduce the sensitivity and accuracy of the cylinder, so that the finished product of the longitudinal error increases; this nonlinear friction will also cause the pressure feedback system of low-frequency oscillation, which is difficult to use this ideal oscillation Correction links to be eliminated, thus reducing the dynamic quality of the system. 1. Cylinder friction generated