A brief introduction to the thickness control of the strapping steel strip

In order to ensure the required accuracy of the full-length thickness of the finished packaged steel strip, it is necessary to ensure that the thickness of a batch of the same specification coils reaches the target thickness, the difference meets the national or factory standards, and the thickness of the full-length strip in the coil is uniform and the same For board differences, it is necessary to control 'the thickness of the head of a batch of coils' and 'the thickness difference of the full length of each coil'. These two control goals are actually achieved through two completely different but interrelated functions. The accuracy of the head thickness is mainly determined by the thickness setting model. The task of establishing the model is to pre-set each machine before threading. The gap between the racks, the gap, speed and tension of each rack need to be 'adjusted' under the condition that the strip has transitioned to another specification in each rack, that is, dynamic thickness changes. The difference between cold tandem rolling and hot tandem rolling is that the rolling speed is very low. After passing, the speed is accelerated to the rolling speed. The acceleration part is longer. There is an acceleration part to adjust the roll gap, speed and tension. The thickness of the head will be set by The accuracy of the model and the adjustment of the acceleration part are determined. Due to the long rolling time of the strip in the cold tandem rolling, the model will be adjusted many times during the milking process of the strip coil. After the adjustment, the 'post setting' will be carried out. To improve thickness accuracy. The accuracy of strip thickness is mainly determined by the function of the automatic thickness control system. The automatic thickness control system is put into operation after the start of the stable rolling section or the end of the dynamic thickness change.