CN105983582A - Thickness feedback control method for hot continuous rolling strip steel - Google Patents
Thickness feedback control method for hot continuous rolling strip steel Download PDFInfo
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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
The present invention relates to hot-continuous-rolling strip steel technical field, the thickness feedback control method of a kind of hot-continuous-rolling strip steel.
Background technology
Strip thickness feedback control system occupy highly important status in whole production process, and the quality of control is directly
Have influence on quality and the qualification rate of finished product.Generally, hot-strip thickness feedback controls mainly to realize in finish rolling,
And the gauge automatic control function of finish rolling is to realize the powerful tool that thickness and precision controls.Thickness feedback control therein
System is to ensure that the key that strip steel total length thickness feedback controls.
Thickness feedback controls to belong to closed loop feedback control, has higher control accuracy, widely used in cold and hot tandem rolling essence
In milling train group.Thickness feedback controls to be the thickness deviation each frame of amount feedback regulation according to finish rolling outlet calibrator detection
Roll gap and roll rotational speed, thus ensure that thickness deviation reaches optimum in the margin of tolerance allowed.Thickness deviation:
Thickness sensitivity value-thickness targets value, represents the degree of thickness actual deviation thickness targets.
Existing belt steel thickness feedback control is primarily present problems with:
1, as it is shown in figure 1, strip steel head one segment distance has stung steel in above frame, follow-up frame is in before stinging steel
Losing a state, in the case of strip steel does not has forward direction tension force, roll-force causes greatly roll spring big, the easy super thick of thickness,
And head cold spot exacerbates super thick degree.For gauge automatic control, in the some rice of strip steel head this section away from
From the real setting situation that can not truly reflect belt steel thickness.
2, there is a certain distance between each frame of finish rolling, and finish rolling outlet frame distance calibrator also has a certain distance,
When thickness deviation being detected and starting feedback regulation, each frame (mainly afer bay) roll gap changes, it practice,
Regulation now is delayed for strip steel, because there is a spacing position of the position of strip steel detection and roll gap adjustment
From.If be directly adjusted according to the thickness deviation of detection, the anti-situation about adjusting of hyperharmonic will certainly occur.In order to
Reduce the anti-situation about adjusting of hyperharmonic, feedback regulation long period delayed startup, but start later often resulting in and regulate
Not as good as thus cause thickness head overproof apart from long.
Assuming that thickness feedback regulation does not puts into, thickness curve is divided into following several situation: situation one, as in figure 2 it is shown,
1s position Thickness sensitivity deviation >=0.3mm, after 1s, thickness is the thickest.Situation two, as it is shown on figure 3,1s position thickness
Detection error is 0.1～0.3mm, and after 1s, thickness is normal.Situation three, as shown in Figure 4,1s position Thickness sensitivity
Deviation is at≤0.1mm, and after 1s, thickness is the thinnest.Situation four, as it is shown in figure 5,1s position Thickness sensitivity deviation≤
After 0mm, 1s, thickness is the thinnest.On the whole, it is simply that head thickness is the thickest compared with the belt steel thickness after head,
And there is certain regularity.
When putting into thickness feedback regulation in the case of 3, any of the above, it may appear that following several situations:
(1) thickness feedback regulation is more timely, and beneficially thickness feedback controls.
(2) regulation that thickness feedback be there is no need, can cause thickness to have the thinnest trend.
(3) thickness feedback regulation direction and desired orientation are contrary, cause thickness the most dawn aobvious.
(4) due at head 1s detect thickness deviation be negative, regulate in the right direction, but less regulated quantity be basic
Cannot ensure that the thickness feedback after 1s controls situation.
Summary of the invention
It is an object of the invention to provide a kind of method that hot continuous rolling thickness feedback controls, it passes through matching fair curve,
Strip steel head Thickness sensitivity deviation is processed, preferably predicts the actual set situation of strip steel, and according to correction
After curve carry out thickness feedback regulation, thus improve thickness feedback accuracy, reduce that thickness is overproof and fluctuation, keep away
Exempting from that the hyperharmonic of thickness adjusted is counter adjusts, relatively big in order to solve strip steel head thickness feedback adjusting deviation, feedback regulation is produced
The raw anti-problem adjusted of hyperharmonic.
For achieving the above object, the solution of the present invention is: a kind of method that hot continuous rolling thickness feedback controls, described
Thickness feedback control method arranges calibrator at finishing mill outlet, described calibrator measure finish rolling outlet strip steel
Actual (real) thickness, and feed back to controller, by the controller actual (real) thickness according to strip steel and the deviation of target thickness, right
Belt steel thickness carries out feedback regulation, until detecting that the actual (real) thickness of strip steel is equal with target thickness, and described thickness
Feedback specifically includes following steps:
(1) after strip steel head reaches calibrator, calibrator detects the actual (real) thickness of finish rolling outlet strip steel in real time, and
The strip steel actual (real) thickness detected is fed back to controller, controller according to the actual (real) thickness of strip steel and target thickness,
Determine strip thickness deviation value, and obtain a strip thickness deviation curve；
(2) controller is advised according to setting rule and the strip steel head super thick of hot continuous rolling finish rolling outlet strip steel target thickness
Rule, one thickness deviation fair curve of matching；
(3) controller is according to described thickness deviation fair curve, repaiies the thickness deviation of strip steel head in real time
Just, revised thickness deviation curve is obtained；
(4) starting thickness feedback to control, controller is according to described revised thickness deviation curve, feedback regulation essence
Roll each frame roll gap and roll rotational speed, it is achieved the feedback regulation to belt steel thickness.
Thickness feedback control method according to hot-continuous-rolling strip steel of the present invention, described thickness deviation fair curve
For the thickness in strip steel head setpoint distance is compensated and corrected, exceed in described strip steel head setpoint distance
Thickness compensation correction value is equal to 0.
Thickness feedback control method according to hot-continuous-rolling strip steel of the present invention, described strip steel head setpoint distance is
9m～11m.
Thickness feedback control method according to hot-continuous-rolling strip steel of the present invention, in described step (3), passes through
The value on thickness deviation curve detected by controller deducts the value on the thickness deviation fair curve of correspondence, to obtain final product
To revised thickness deviation curve.
Thickness feedback control method according to hot-continuous-rolling strip steel of the present invention, described thickness deviation fair curve,
The Thickness scope compensating and correcting belt steel thickness is: 01.mm～0.5mm.
Thickness feedback control method according to hot-continuous-rolling strip steel of the present invention, described thickness deviation fair curve,
The time span compensating and correcting belt steel thickness is: 0.5s～1.5s.
The beneficial effect that the present invention reaches: the thickness feedback control method of the present invention exports according to hot strip rolling finish rolling
The setting rule of thickness, one thickness deviation fair curve of matching, to strip steel head Thickness sensitivity deviation according to matching
Fair curve be modified, can predict that strip steel sets situation really, according to revised inspection the most accurately
Surveying deviation and carry out feedback regulation, it is the most accurate to control, and prevents overshoot or counter adjusts phenomenon.
The start-up study time of feedback regulation is greatly shortened, avoid overshoot or anti-adjust while, entering the most as early as possible
Row regulation, improves the accuracy that belt steel thickness controls, accelerates work efficiency, head thickness is greatly reduced and surpasses
The mass defect of difference.
Accompanying drawing explanation
Fig. 1 is the system construction drawing of belt steel thickness regulation；
Fig. 2～Fig. 5 is that thickness feedback regulates the four kinds of belt steel thickness curves being likely to occur when not putting into；
Fig. 6 is the thickness deviation fair curve of the present invention；
Fig. 7～10 is that the method using the present invention carries out the revised thickness deviation of thickness deviation to four kinds of different situations
Curve；
Figure 11 is the workflow diagram of the present invention.
Figure 12 is the feedback regulation curve chart during strip steel head thickness partially of the present invention；
Figure 13 be the strip steel head of the present invention the thinnest time feedback regulation curve chart.
Detailed description of the invention
The present invention is further detailed explanation with specific embodiment below in conjunction with the accompanying drawings.
Thickness feedback control method is by arranging X-ray thickness gauge at finishing mill outlet, described X-ray survey
The actual (real) thickness of finish rolling outlet strip steel measured by thick instrument, and feeds back to controller, by controller according to the actual thickness of strip steel
Degree and the deviation of target thickness, carry out feedback regulation to belt steel thickness, until actual (real) thickness and the mesh of strip steel being detected
Mark thickness is equal.
According to universal rule present in the THICKNESS CONTROL that the thickness curve shown in Fig. 2～Fig. 5 is characterized, strip steel is more
Near head, thickness is the thickest, and this segment distance of strip steel head cannot be directly used to predict the thickness thin and thick feelings that strip steel is follow-up
Condition, after needing the thickness of strip steel head is carried out special handling, could preferably predict the thickness reality that strip steel is follow-up
Thin and thick situation.
According to the rule of strip steel head super thick shown in Fig. 2～Fig. 5, matching of the present invention thickness as shown in Figure 6 is inclined
Difference fair curve, for compensating and correcting the thickness deviation of the strip steel head detected, and according to revised
Thickness deviation carries out feedback regulation to belt steel thickness.Thickness deviation fair curve shown in Fig. 6 is for strip steel head
Thickness in setpoint distance (such as 10m distance) compensates and corrects, i.e. t in Fig. 61Correction value in time is used
In the correction of strip steel head thickness deviation, the thickness compensation correction value exceeded in described strip steel head setpoint distance is equal to
0, i.e. more than t in Fig. 61The thickness compensation correction value of time is 0, and in the present embodiment, the value of t is 0.5s～1.5s.
Thickness deviation values h1Value be 01.mm～0.3mm.
Such as Figure 11, thickness feedback control method of the present invention specifically includes following steps:
(1) after strip steel head reaches X-ray thickness gauge, described X-ray thickness gauge detects finish rolling in real time and goes out
The actual (real) thickness of mouth strip steel, and the strip steel actual (real) thickness detected is fed back to controller, controller is according to strip steel
Actual (real) thickness and target thickness, determine strip thickness deviation value, and obtain a strip thickness deviation curve；
(2) the thickness deviation curve that controller obtains according to step (1), and hot continuous rolling finish rolling outlet strip steel mesh
The setting rule of mark thickness, one thickness deviation fair curve of matching, as shown in Figure 6；
(3) controller is according to described thickness deviation fair curve, repaiies the thickness deviation of strip steel head in real time
Just, i.e. arriving X-ray thickness gauge in strip steel head, X-ray thickness gauge detects that belt steel thickness starts simultaneously, control
Device processed is according to described thickness deviation fair curve, in real time to the thickness in the strip steel head 10m distance detected
Deviation compensates and corrects, and i.e. deducts thickness deviation correction value with the thickness deviation values detected, the thickness finally given
Degree deviation value controls for thickness feedback.
(4) starting thickness feedback to control, controller is according to revised thickness deviation curve, and feedback regulation finish rolling is each
The roll gap of frame and roll rotational speed, it is achieved the feedback regulation to belt steel thickness.
After using the feedback of the present invention, for the concrete regulation of four kinds of situations that belt steel thickness is likely to occur
As follows:
Situation one: head thickness is the thickest, carry out feedback regulation according to revised thickness deviation curve, it is to avoid roller
Drafts is excessive causes overshoot for seam, and revised thickness deviation curve is as shown in Figure 7.
Situation two: head thickness is normal, carries out feedback regulation according to revised thickness deviation curve, it is to avoid roller
Seam carries out pressure action and causes thickness ironed, and revised thickness deviation curve is as shown in Figure 8.
Situation three: head thickness is the thinnest, carry out feedback regulation according to revised thickness deviation curve, it is to avoid roller
Seam carries out pressure action and causes thickness thinner, and revised thickness deviation curve is as shown in Figure 9.
Situation four: head thickness is ultra-thin, carries out feedback regulation according to revised thickness deviation curve, increases roller
Sewing on the amount lifted, improve thickness compensation amount, reduce the situation that thickness is the thinnest, revised thickness is inclined
Difference curve is as shown in Figure 10.
Use the inventive method two concrete application examples as shown in figure 12 with shown in Figure 13.
In Figure 12, in the case of strip steel head partially thickness, it is controlled according to revised thickness deviation fair curve,
Avoid that roll gap volume under pressure is excessive causes thickness the thinnest.
In Figure 13, in the case of strip steel head is the thinnest, if according to virgin curve control, roll gap is pressed down, meeting
Cause thickness thinner, be controlled according to the present invention revised thickness deviation fair curve, roll gap carry out on lift,
Compensate for the trend that thickness is thinner.
After implementing the control method of the present invention, the Startup time of belt steel thickness feedback regulation is by original 0.6 second in advance
By 0.1 second, can be while avoiding overshoot or anti-tune, being adjusted the most as early as possible, improve THICKNESS CONTROL
Accuracy, is greatly reduced the mass defect that head thickness is overproof, also substantially increases work efficiency simultaneously.
The present invention is according to one thickness deviation fair curve of setting rule matching of hot continuous rolling finish rolling exit thickness, to band
The detection error of steel head thickness compensates and corrects according to the fair curve of matching, and prediction strip steel is true the most accurately
Real setting situation, and according to revised thickness deviation, the thickness of strip steel is carried out feedback regulation, control more to be as the criterion
Really, overshoot when preventing feedback regulation or counter adjust phenomenon.
Claims (6)
1. a thickness feedback control method for hot-continuous-rolling strip steel, described thickness feedback control method goes out at finishing mill
Mouth arranges calibrator, described calibrator measure the actual (real) thickness of finish rolling outlet strip steel, and feed back to controller,
By the controller actual (real) thickness according to strip steel and the deviation of target thickness, belt steel thickness is carried out feedback regulation, until
Detect that the actual (real) thickness of strip steel is equal with target thickness, it is characterised in that:
Described thickness feedback control method specifically includes following steps:
(1) after strip steel head reaches calibrator, calibrator detects the actual (real) thickness of finish rolling outlet strip steel in real time, and
The strip steel actual (real) thickness detected is fed back to controller, controller according to the actual (real) thickness of strip steel and target thickness,
Determine strip thickness deviation value, and obtain a strip thickness deviation curve；
(2) controller is advised according to setting rule and the strip steel head super thick of hot continuous rolling finish rolling outlet strip steel target thickness
Rule, one thickness deviation fair curve of matching；
(3) controller is according to described thickness deviation fair curve, repaiies the thickness deviation of strip steel head in real time
Just, revised thickness deviation curve is obtained；
(4) starting thickness feedback to control, controller is according to described revised thickness deviation curve, feedback regulation essence
Roll each frame roll gap and roll rotational speed, it is achieved the feedback regulation to belt steel thickness.
The thickness feedback control method of hot-continuous-rolling strip steel the most according to claim 1, it is characterised in that described
Thickness deviation fair curve, for compensating and correcting the thickness in strip steel head setpoint distance, exceedes described strip steel
Thickness compensation correction value in head setpoint distance is equal to 0.
The thickness feedback control method of hot-continuous-rolling strip steel the most according to claim 2, it is characterised in that described band
Steel head setpoint distance is 9m～11m.
The thickness feedback control method of hot-continuous-rolling strip steel the most according to claim 1, it is characterised in that described
In step (3), deducted the thickness deviation correction of correspondence by the value on the thickness deviation curve that detected by controller
Value on curve, i.e. obtains revised thickness deviation curve.
The thickness feedback control method of hot-continuous-rolling strip steel the most according to claim 2, it is characterised in that described
Thickness deviation fair curve, the Thickness scope compensating and correcting belt steel thickness is: 01.mm～0.5mm.
The thickness feedback control method of hot-continuous-rolling strip steel the most according to claim 2, it is characterised in that described
Thickness deviation fair curve, the time span compensating and correcting strip steel head thickness is: 0.5s～1.5s.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108435802A (en) * | 2018-03-31 | 2018-08-24 | 扬州大学 | A kind of control method and its artificial circuit of the hot continuous rolling AGC system estimated based on Smith |
| CN110548769A (en) * | 2019-08-29 | 2019-12-10 | 武汉钢铁有限公司 | Method for early warning thickness deviation of strip steel on line |
| CN110814048A (en) * | 2019-10-30 | 2020-02-21 | 山西太钢不锈钢股份有限公司 | Finish rolling quality control method for strip steel hot continuous rolling finishing mill group |
| CN111174737A (en) * | 2018-11-09 | 2020-05-19 | 本田技研工业株式会社 | Method for measuring coating amount |
| CN113134514A (en) * | 2021-04-25 | 2021-07-20 | 东北大学 | Strip steel head thickness forecasting method based on deep learning |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53102257A (en) * | 1977-02-18 | 1978-09-06 | Hitachi Ltd | Automatic gauge controller |
| JPS5868414A (en) * | 1981-10-20 | 1983-04-23 | Sumitomo Metal Ind Ltd | Method for controlling sheet thickness using inlet-side thickness gauge |
| JPH05285519A (en) * | 1992-04-13 | 1993-11-02 | Kawasaki Steel Corp | Method for controlling tension between stands in continuous rolling |
| CN1820863A (en) * | 2006-01-24 | 2006-08-23 | 东北大学 | Method for automatic controlling thickness in fast high precision plate strip rolling process |
| CN101618401A (en) * | 2009-07-24 | 2010-01-06 | 东北大学 | High precision strip rolling thickness control method based on feedback signals by thickness gauge |
| CN101804420A (en) * | 2009-10-10 | 2010-08-18 | 唐山国丰钢铁有限公司 | Method for controlling precision rolling thickness in production of hot rolled sheet |
| CN103934278A (en) * | 2013-01-23 | 2014-07-23 | 宝山钢铁股份有限公司 | Hot-rolling and finish-rolling strip steel thickness control method |
-
2015
- 2015-02-28 CN CN201510091838.0A patent/CN105983582B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53102257A (en) * | 1977-02-18 | 1978-09-06 | Hitachi Ltd | Automatic gauge controller |
| JPS5868414A (en) * | 1981-10-20 | 1983-04-23 | Sumitomo Metal Ind Ltd | Method for controlling sheet thickness using inlet-side thickness gauge |
| JPH05285519A (en) * | 1992-04-13 | 1993-11-02 | Kawasaki Steel Corp | Method for controlling tension between stands in continuous rolling |
| CN1820863A (en) * | 2006-01-24 | 2006-08-23 | 东北大学 | Method for automatic controlling thickness in fast high precision plate strip rolling process |
| CN101618401A (en) * | 2009-07-24 | 2010-01-06 | 东北大学 | High precision strip rolling thickness control method based on feedback signals by thickness gauge |
| CN101804420A (en) * | 2009-10-10 | 2010-08-18 | 唐山国丰钢铁有限公司 | Method for controlling precision rolling thickness in production of hot rolled sheet |
| CN103934278A (en) * | 2013-01-23 | 2014-07-23 | 宝山钢铁股份有限公司 | Hot-rolling and finish-rolling strip steel thickness control method |
Non-Patent Citations (1)
| Title |
|---|
| 张景进: "《热连轧带钢生产》", 30 June 2005, 冶金工业出版社 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108435802A (en) * | 2018-03-31 | 2018-08-24 | 扬州大学 | A kind of control method and its artificial circuit of the hot continuous rolling AGC system estimated based on Smith |
| CN111174737A (en) * | 2018-11-09 | 2020-05-19 | 本田技研工业株式会社 | Method for measuring coating amount |
| CN111174737B (en) * | 2018-11-09 | 2021-08-24 | 本田技研工业株式会社 | Method for measuring coating amount |
| CN110548769A (en) * | 2019-08-29 | 2019-12-10 | 武汉钢铁有限公司 | Method for early warning thickness deviation of strip steel on line |
| CN110814048A (en) * | 2019-10-30 | 2020-02-21 | 山西太钢不锈钢股份有限公司 | Finish rolling quality control method for strip steel hot continuous rolling finishing mill group |
| CN113134514A (en) * | 2021-04-25 | 2021-07-20 | 东北大学 | Strip steel head thickness forecasting method based on deep learning |
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