Thickness feedback control method for hot continuous rolling strip steel

Abstract

The invention relates to the technical field of hot continuous rolling strip steel, in particular to a thickness feedback control method for hot continuous rolling strip steel. The feedback control method includes the steps that the curve is corrected by fitting the thickness deviation, compensating correction is conducted on the thickness detection deviation of the head of the strip steel, the actual setting condition of the strip steel is better predicted, and thickness feedback adjustment of the strip steel is conducted according to the corrected thickness deviation curve, so that thickness feedback accuracy is improved, the thickness out of tolerance and fluctuation are reduced, and overshoot and undershoot of thickness adjustment are avoided; and the problems that the thickness feedback adjustment deviation of the head of the strip steel is large and overshoot and undershoot are generated in the feedback adjustment process are solved.

Description

technical field [0001] The invention relates to the technical field of hot continuous rolling strip steel, in particular to a thickness feedback control method of hot continuous rolling strip steel. Background technique [0002] The strip thickness feedback control system occupies a very important position in the whole production process, and the quality of the control directly affects the quality and qualification rate of the finished product. In general, the thickness feedback control of hot-rolled strip steel is mainly realized in finish rolling, and the thickness automatic control function of finish rolling is a powerful tool to realize thickness precision control. The thickness feedback control is the key to ensure the full length thickness feedback control of the strip. [0003] Thickness feedback control belongs to closed-loop feedback control, which has high control precision and is widely used in hot and cold continuous rolling and finishing mills. Thickness feedb...

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Problems solved by technology

[0005] 1, such as figure 1 As shown, the head of the strip has bitten the steel at a certain distance from the front frame, and the subsequent frame is in a state of tension before the steel is bitten. When the strip has no forward tension, the high rolling force will cause the roll to bounce greatly, and the thickness will easily exceed Thick, and the cold spot on the head exacerbates the extra thickness

For thickness automatic control, the distance within a few meters of the strip head cannot truly reflect the true setting of the strip thickness

[0006] 2. There is a certain distance between the finish rolling stands, and there is also a certain distance between the finish rolling exit stand and the thickness gauge. When the thickness deviation is detected and the feedback adjustment is started, the rolls of each stand (mainly the rear stand) Gap changes, in fact, the adjustment at this time is lagging behind for the strip, because there is a certain distance between the detection position of the strip and the adjustment position of the roll gap

[0010] (2) The thickness feedback has been adjusted unnecessarily, which will lead to a tendency to thin the thickness

[0011] (3) The thickness feedback adjustment direction is opposite to the expected direction, resulting in a thinner thickness

[0012] (4) Since the thickness deviation detected at the head 1s is negative, the adjustment direction is correct, but the small adjustment amount cannot guarantee the thickness feedback control after 1s at all

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