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Introduction to thickness control of packaging steel strip
by：Hongmei
2021-03-15
Introduction to thickness control of packaging steel strip
In order to ensure that the full-length thickness of the finished product reaches the required accuracy, it is necessary to ensure that the thickness of a batch of coils of the same specification reaches the target thickness (the difference is in line with the national standard or factory standard), and the full length of the strip in a steel coil must be guaranteed The thickness is uniform (the same board difference). Therefore, it is necessary to control 'the thickness of the head of a batch of coils' and 'the thickness difference of the total length of each coil'. These two control goals are actually completed by two completely different but interrelated functions. The accuracy of the head thickness is mainly determined by the thickness setting model. The task of setting the model is to pre-set the roll gap, speed and tension of each stand before threading. The roll gap, speed and tension of each frame are 'adjusted' to transition to another specification (that is, dynamic specification change).
The difference between cold tandem rolling and hot tandem rolling is that the threading speed is very low. After threading, the speed is accelerated to the rolling speed. Therefore, the acceleration section is longer. For this reason, there is an acceleration section to adjust the roll gap, speed and tension. . The final thickness of the head will be determined by the accuracy of the set model and the adjustment of the acceleration section. In addition, because the cold tandem rolling takes a long time to roll a coil, multiple model adaptations will be carried out during a coil milking process, and After self-adaptation, 'post-setting' is performed to improve the thickness accuracy.
The accuracy of the overall thickness of the strip is mainly determined by the AGC (Automatic Thickness Control System) function applied after the start of the stable rolling section (or after the end of the dynamic specification change).
In order to ensure that the full-length thickness of the finished product reaches the required accuracy, it is necessary to ensure that the thickness of a batch of coils of the same specification reaches the target thickness (the difference is in line with the national standard or factory standard), and the full length of the strip in a steel coil must be guaranteed The thickness is uniform (the same board difference). Therefore, it is necessary to control 'the thickness of the head of a batch of coils' and 'the thickness difference of the total length of each coil'. These two control goals are actually completed by two completely different but interrelated functions. The accuracy of the head thickness is mainly determined by the thickness setting model. The task of setting the model is to pre-set the roll gap, speed and tension of each stand before threading. The roll gap, speed and tension of each frame are 'adjusted' to transition to another specification (that is, dynamic specification change).
The difference between cold tandem rolling and hot tandem rolling is that the threading speed is very low. After threading, the speed is accelerated to the rolling speed. Therefore, the acceleration section is longer. For this reason, there is an acceleration section to adjust the roll gap, speed and tension. . The final thickness of the head will be determined by the accuracy of the set model and the adjustment of the acceleration section. In addition, because the cold tandem rolling takes a long time to roll a coil, multiple model adaptations will be carried out during a coil milking process, and After self-adaptation, 'post-setting' is performed to improve the thickness accuracy.
The accuracy of the overall thickness of the strip is mainly determined by the AGC (Automatic Thickness Control System) function applied after the start of the stable rolling section (or after the end of the dynamic specification change).
