Automatic correction control method for strip steel in hot continuous rolling finishing mill
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A technology of finishing rolling mill and control method, applied in rolling force/roll gap control, metal rolling, metal rolling, etc., can solve the problems of strip deviation, adjustment hysteresis, and different responses, etc.
Active Publication Date: 2020-12-08
SHANGHAI MEISHAN IRON & STEEL CO LTD
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[0002] In the production process of thin-gauge strip steel rolled by hot-rolling enterprises, the phenomenon of strip deviation and tail-flicking in the finishing mill has always been a major technical problem in the hot-rolling industry. The rolling mill rolls scrap steel; the second is that the deviation of the strip steel leads to tail flicking of the strip steel, and roll marks appear on the rolls of the finishing mill stand, which requires abnormal roll replacement, which increases the wear and tear of the rolls and the downtime. Tail cutting reduces the product yield
[0003] At present, there are generally two ways for hot rolling enterprises to solve the problem of strip deviation and tail drift: 1) The operator visually observes the change of the strip shape on site or the change of the rolling force deviation of the finishing mill stand to determine Manually adjust the roll gap deviation of the rack to reduce the phenomenon of strip deviation and tail flicking. However, it takes a certain amount of time for the operator to adjust from visual inspection to manual adjustment, and each person responds differently, resulting in a lag in adjustment. The results can only be qualitative, not quantitative, and the adjustments made by each person to the same phenomenon are inconsistent, resulting in inaccurate adjustments; 2) Some enterprises have developed a method based on the variation trend of the rolling force deviation of the front stand to speculate According to the variation trend of rolling force deviation that may appear in the downstream stand, the roll gap deviation value of the downstream stand is automatically adjusted according to the estimated rolling force deviation change trend, and the deviation correction function for the strip is realized
However, practice has proved that it is not necessarily accurate to speculate whether the strip is off-tracked according to the variation trend of the rolling force deviation. When there is a wedge shape in the strip steel, the variation trend of the rolling force deviation of the stand is consistent with the variation trend of the wedge shape of the strip steel, so it is wrong to infer the deviation of the strip steel, and the adjustment of the roll gap deviation of the stand is also wrong
To sum up, it can be seen that in the prior art, relying on the operator's intervention adjustment and the deviation correction function according to the changing trend of the rolling force cannot effectively and accurately solve the problems of strip deviation and tail drifting
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Embodiment 1
[0018] In this embodiment, the rolled strip thickness H: 2.0mm, the strip width W: 1250mm, and the set speed V of each stand of the finishing mill 1 ~V 7 : 78mpm, 148mpm, 248mpm, 362mpm, 489mpm, 601mpm, 675mpm, set rolling force F for each stand of the finishing mill 1 ~F 7 : 2672ton, 1829ton, 1684ton, 1500ton, 1321ton, 1103ton, 908ton, the distance from the steel deviation detection device to the downstream frame S = 2.8m, the frame stiffness K of the finish rolling unit of the downstream frame M =600ton / mm, rolled strip thickness H: 2.0mm corresponds to strip thickness factor H gain 1.2 (Hgain : 1.0; 1.5mm≤Hgain : 1.2; 2.5mm≤Hgain : 1.5; 4.5mm≤H, H gain : 1.8), the above data can be obtained from the secondary model system of the hot continuous rolling finishing mill when the strip reaches the entrance of the hot continuous rolling finishing mill.
[0019] In this embodiment, the strip steel automatic deviation correction control method of the hot continuous rolling and ...
Embodiment 2
[0043]This embodiment is basically the same as Embodiment 1, and the difference is that in this embodiment, the strip deviation detection device is installed between F4 and F5 racks, and the strip deviation detection device between F4 and F5 racks is calculated. The deviation value corresponds to the adjustment amount of the roll gap deviation of the F5 frame. Therefore, the upstream rack is an F4 rack, the downstream rack is an F5 rack, and the speed of the upstream rack is V=V 4 =362mpm= 6.03m / s, setting rolling force F=F of the downstream stand 5 =1321ton.
[0044] When both the F4 and F5 racks bite the steel, the strip deviation detection device starts to detect the strip deviation value, and the first detection data is △w: 40mm (the deviation position data is positive, indicating that the strip deviation is on the drive side of the rack. , negative value, partial to the working side), then correspondingly:
[0045] ΔG=2Δw*F*H gain / W*K M
[0046] =2*40*1321*1.2 / 1250...
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Abstract
The invention relates to an automatic strip steel deviation correction control method for a hot continuous rolling finishing mill group. The automatic strip steel deviation correction control method includes the following steps that 1, a strip steel deviation detecting device is arranged between two adjacent racks of the hot continuous rolling finishing mill group; 2, the strip steel deviation value delta w at the strip steel deviation detection device is obtained; 3, the to-be-adjusted roll gap deviation value delta G of the downstream rack is calculated according to the strip steel deviationvalue delta w; 4, the time T of the strip steel from the detection device to the downstream rack is calculated; 5, a rack roll gap control system delays time T, and the roll gap of the downstream rack is adjusted according to the roll gap deviation value delta G; 6, the strip steel deviation value delta w at the strip steel deviation detection device is detected by the strip steel deviation detection device, and the step 3 is repeatedly executed until downstream rack steel cast is conducted; and after the downstream rack steel cast is conducted, the roll gap deviation delta G of the downstream rack is cleared. The roll gap deviation of the downstream rack is continuously adjusted according to the strip steel deviation position, and thus the deviation correction of the strip steel during entire rolling is realized.
Description
technical field [0001] The invention relates to an automatic deviation correction control method for strip steel in a hot continuous rolling finishing mill, and belongs to the technical field of electric automation control. Background technique [0002] In the production process of thin-gauge strip steel rolled by hot-rolling enterprises, the phenomenon of strip deviation and tail-flicking in the finishing mill has always been a major technical problem in the hot-rolling industry. The rolling mill rolls scrap steel; the second is that the deviation of the strip steel leads to tail flicking of the strip steel, and roll marks appear on the rolls of the finishing mill stand, which requires abnormal roll replacement, which increases the wear and tear of the rolls and the downtime. Tail cutting reduces the product yield. [0003] At present, there are generally two ways for hot rolling enterprises to solve the problem of strip deviation and tail drift: 1) The operator visually o...
Claims
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Application Information
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