A Thickness Feedback Control Method of Hot Strip Rolling
A feedback control, hot tandem rolling technology, applied in the field of hot tandem strip steel, can solve the problems of strip lag, unnecessary, large roll bounce, etc. The effect of overshoot or inversion
Active Publication Date: 2018-04-27
BAOSHAN IRON & STEEL CO LTD
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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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[0033] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.
[0034] The thickness feedback control method is to install an X-ray thickness gauge at the exit of the finishing mill. The X-ray thickness gauge measures the actual thickness of the finished strip at the exit of the finishing rolling mill, and feeds it back to the controller. The deviation between the thickness and the target thickness will be fed back and adjusted to the strip thickness until it is detected that the actual thickness of the strip is equal to the target thickness.
[0035] according to Figure 2 ~ Figure 5 The general rule of thickness control represented by the thickness curve shown is that the closer the strip is to the head, the thicker the thickness. The distance between the strip head cannot be directly used to predict the subsequent thickness of the strip. After the thickness of the steel head is specially processed, the actual th...
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The invention relates to a thickness feedback control method of hot continuous rolling strip steel, and relates to the technical field of hot continuous rolling strip steel. The feedback control method compensates and corrects the thickness detection deviation of the strip steel head by fitting the thickness deviation correction curve , to better predict the actual setting of the strip, and adjust the thickness feedback of the strip according to the corrected thickness deviation curve, thereby improving the accuracy of thickness feedback, reducing thickness tolerance and fluctuation, and avoiding overshoot and reverse adjustment of thickness adjustment . Solve the problem that the feedback adjustment deviation of the thickness of the strip steel head is relatively large, and the feedback adjustment produces overshoot and reverse adjustment.
Description
Technical field [0001] The invention relates to the technical field of hot strip steel, in particular to a thickness feedback control method of hot strip steel. Background technique [0002] The strip thickness feedback control system occupies a very important position in the entire production process, and the quality of the control directly affects the quality and pass rate of the finished product. In general, the thickness feedback control of hot-rolled strip is mainly realized in finishing rolling, and the automatic thickness control function of finishing rolling is a powerful tool to realize thickness precision control. The thickness feedback control is the key to ensure the thickness feedback control of the full length of the strip. [0003] Thickness feedback control belongs to closed-loop feedback control, with high control accuracy, and is widely used in hot and cold continuous rolling finishing mills. Thickness feedback control is to feedback and adjust the roll gap and ...
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IPC IPC(8): B21B37/20
Inventor 刘苗郭耀武杜林
Owner BAOSHAN IRON & STEEL CO LTD