CN103464471B - Automatic gauge control (AGC) self-adaptive control method for hot rolling mill - Google Patents
Automatic gauge control (AGC) self-adaptive control method for hot rolling mill Download PDFInfo
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Abstract
The invention relates to an automatic gauge control (AGC) self-adaptive control method for a hot rolling mill, wherein the problem, which cannot be solved by an AGC setting model, that thickness control precision of several strip steel heads before changing a specification during a rolling procedure is not high is solved. The technical scheme of the invention is that the AGC self-adaptive control method for the hot rolling mill comprises the following step of performing an AGC self-adaptive control function of online adjusted of the presetting roll gap and roll force of the rack selected at front end of the rolling mill and all racks at the rear end of the rolling mill according to a different value between the real roll gap and real roll force of the rack at the front end of the rolling mill during a steel biting procedure and the roll gap and roll force preset by the AGC setting model, so that the thickness control precision of the strip steel heads at the exit of the rolling mill is improved.
Description
Technical field
The present invention relates to a kind of hot-tandem unit automatic thickness and control (AGC) self-adaptation control method, self control thought of hot-tandem unit automation control system is utilized to set up a kind of AGC self-adaptation control method, to improve mm finishing mill unit outlet strip steel head thickness control accuracy, solve in the indeterminable operation of rolling of AGC setting model and change the not high problem of specification former pieces of strip steel head thickness control accuracies.
Background technology
During current hot continuous rolling enterprise produces, all there is the not high problem of strip steel head thickness control accuracy in controlling in belt steel thickness, its reason has following two aspects: one, only have thickness gauge AGC and Monitor Process two functions in current hot-tandem unit AGC automation control system.Thickness gauge AGC has the feature of real-time, but, to the control accuracy of belt steel thickness, it depends on that AGC setting model is to the roll gap of finishing stand, the presetting of roll-force, and the pre-set value of AGC setting model calculates the many factors such as temperature, material owing to relating to finish rolling entrance intermediate blank, its setting value always differs more with actual value, as roll-force often differs about 200 tons, thus the control of thickness gauge AGC to strip steel head thickness is caused to there is deviation; Monitor Process, owing to himself controlling the upper hysteresis existed, needs, according to the belt steel thickness data detected, to adjust the control data of follow-up band steel, can not solve the problem of strip steel head thickness and precision.Two, AGC adaptation function is not had in hot-tandem unit AGC automation control system.The problem of current solution hot-continuous-rolling strip steel head thickness control accuracy, only have and constantly optimize, improve the setting accuracy of AGC setting model, but, still exist and can not thoroughly deal with problems, because the self adaptation of AGC setting model has hysteresis quality, the feature of successive optimization, it needs the setting data removing to optimize calculated for subsequent rolled band steel according to the rolling data of last block of band steel, and generally all need the band steel of rolling more than 3 pieces just can be optimized to optimal result, therefore, it can't resolve in the operation of rolling the not high problem of former pieces of strip steel head thickness control accuracies changing specification.So, along with the further lifting that hot rolling enterprise requires product thickness control accuracy, in order to solve the problem of strip steel head thickness control accuracy, except improving the presetting accuracy of AGC setting model further, outside AGC setting model, utilize self control thought of hot-tandem unit automation control system, exploitation hot-tandem unit AGC adaptive control function, improve the control accuracy of mm finishing mill unit thickness gauge AGC, thus realization raising strip steel head thickness control accuracy is very necessary.
Through retrieval, Chinese patent application 91111673.7 discloses " establishing method of Medium and Heavy Plate Rolling gap values between rollers ", relate to a kind of computer control method of heavy and medium plate mill, the particularly establishing method of cut deal high precision rolling gap values between rollers, by drawing fixed value of roller slit to real-time thickness optimal allocation, operation of rolling self adaptation and mill spring equation, thus reach hit thickness and the straight object of plate shape.It is characterized in that real-time thickness optimal allocation is calculated by Medium and Heavy Plate Rolling influence coefficient, operation of rolling roll gap self adaptation is obtained by the mean value of second and third road observed pressure and set pressure differential, thus revise the fixed value of roller slit in the 4th road to finished product road, mill spring equation is greater than or less than throw-on pressure by actual measurement roll-force, calculates respectively with linear equation or nonlinear equation.Use this method can reduce different plate further poor, improve template glacing flatness, thus significantly improve lumber recovery and the output value.
Chinese patent application 200610116254.5 discloses " utilizing the control method of forward slip adaptive dynamic correction strip steel thickness deviation ", relates to a kind of control method utilizing forward slip adaptive dynamic correction strip steel thickness deviation.The present invention adopts the feedback principle automatically controlled to be optimized forward slip model, the intermediate stand existing AGC control system not being carried out to THICKNESS CONTROL adjustment controls, by carrying out acquisition process to actual (real) thickness deviation, carry out the advancing slip value of reality of adjustment aim, then the advancing slip setting value of forward slip adaptive method correction is utilized, namely indirectly have adjusted the speed of rolls like this, thus reach the object improving strip thickness deviation.Compared with prior art, be characterized in realizing simply, reaction speed is fast in the present invention.
Chinese patent application 201010263591.3 discloses " utilizing roll gap self adaptation to improve the control method of fine-rolling strip steel thickness and precision ", relates to fine-rolling strip steel production control field, particularly relates to a kind of method for controlling thickness of fine-rolling strip steel.Utilize roll gap self adaptation to improve a control method for fine-rolling strip steel thickness and precision, comprise the following steps: set up one is not the carried out index static form of roll gap correction by band steel layer; Before belt steel rolling, judge the roll gap correction currency that the layer of current coiled strip steel is not determined to call, is revised currency the zero point of roll gap correction currency and each frame and be added the roll gap model learning coefficient obtaining each frame and be used for rolling setting precomputation; After belt steel rolling, detection obtains band steel finish to gauge one-tenth-value thickness 1/10 and the actual gap values between rollers of finish rolling end frame, calculate the updated value of band steel finish to gauge thickness deviation, initial roll gap deviate and roll gap correction, when layer residing for this coiled strip steel is not different from last coiled strip steel, then by roll gap correction updated value stored in roll gap correction static state form; Collect the speed of rolls of each frame, roll gap, roll-force, finish to gauge thickness measured data, the zero point of carrying out roll gap is revised.Conbined usage roll gap correction value of the present invention and zero point are revised and improve the adaptive ability of roll gap model in the changeable situation of rolling scaduled specification, thus improve the setting accuracy of model, realize the accurate control to belt steel thickness.
Chinese patent application 200510012668.9 discloses " a kind of method utilizing data redundancy to improve rolling mill thickness control accuracy ", and a kind of method utilizing data redundancy to improve rolling mill thickness control accuracy, belongs to control technology field.It using computer and Thickness measuring instrument as thickness control device, and adopts following steps: set up multifunctional tester, and it and Thickness measuring instrument are installed in milling train exit, jointly gather thickness data; The data obtained all delivers to basic automatization PLC process, then delivers to process machine computer, judges two groups of data; If Thickness measuring instrument is improper, then multifunctional tester data and milling train setting data is compared, try to achieve thickness difference, and draw best learning coefficient according to learning strategy weighting, utilize this coefficient to revise setting model.The present invention ensures that milling train still can normally run under Thickness measuring instrument breaks down situation, thus model adaptation ability is strengthened, improve the self study performance that milling train controls, improve setting accuracy, solve because single tester self-learning function lost efficacy the problem brought.
But technique scheme is all different from technical thought of the present invention: according to the actual roll gap of the frame Biting Course in mm finishing mill unit front end, actual roll-force and the presetting roll gap of AGC setting model, the difference situation of roll-force, the presetting roll gap of the front end frame that mm finishing mill unit is selected and rear end institute organic frame thereof, roll-force carries out the AGC adaptive control function of on-line tuning, its effect revises AGC setting model to the deviation of the presetting generation of frame, and then optimize the control accuracy of thickness gauge AGC, particularly can improve the thickness control accuracy of strip steel head.
Summary of the invention
The object of the invention is: develop a kind of hot-tandem unit AGC self-adaptation control method, solve the problem that strip steel head thickness control accuracy is not high.
Technical scheme of the present invention is: a kind of hot-tandem unit AGC self-adaptation control method, comprise the following steps: according to the actual roll gap of the frame Biting Course in mm finishing mill unit front end, actual roll-force and the presetting roll gap of AGC setting model, the difference situation of roll-force, the presetting roll gap of the front end frame that mm finishing mill unit is selected and rear end institute organic frame thereof, roll-force carries out the AGC adaptive control function of on-line tuning, its effect revises AGC setting model to the deviation of the presetting generation of frame, and then optimize the control accuracy of thickness gauge AGC, particularly can improve the thickness control accuracy of strip steel head.
Particular content comprises the following steps:
1, when being with steel to enter mm finishing mill unit entrance, each group frame receives AGC setting model presetting gap values between rollers, rolling force value;
2, select one, mm finishing mill unit front end frame, when this frame stings steel, automation control system collects roll gap, roll-force data in first 0.5 second of this frame Biting Course, and calculates its roll gap mean value, roll-force mean value;
3, calculate the roll gap mean value stung in first 0.5 second of the steel frame Biting Course each frame roll gap proportionality coefficient presetting with AGC setting model, and the proportionality coefficient of roll-force mean value in first 0.5 second of steel frame Biting Course and the presetting each frame roll-force of AGC setting model is stung in calculating;
4, in automation control system, the gap values between rollers each group of frame set, rolling force value are multiplied by step 3 corresponding proportion coefficient respectively to be revised, and is applied in the thickness gauge AGC control of frame.
The invention has the beneficial effects as follows: utilize the roll-force of finish rolling front end frame, roll gap deviation to carry out adaptive correction to rear end frame AGC parameter, the phenomenon that same for original rolling rolling scaduled needs 3 pieces band steel can make strip steel head precision reach aimed at precision can be shortened to first block of band steel just can reach, thus improve the integral thickness control accuracy of product, the quality scale of improving product.Adaptation function is the useful supplement to existing AGC function, and coming into operation of it does not affect the use of other AGC function.
Detailed description of the invention
The present invention is for 7 groups of continuous mm finishing mill unit, with reference to Fig. 1,2, in hot-tandem unit AGC self-adaptation control method, one, mm finishing mill unit front end frame is selected to be the key point of the technology as automation control system collection, the actual roll gap of computer rack, rolling force value and the roll gap of model specification, the proportionality coefficient of rolling force value.In the present invention, this front end frame is optional, if F1 frame roll gap, roll-force checkout equipment exist abnormal, the inaccurate of adaptation function will be caused, at this moment F2 frame just can be selected as front end frame, adaptation function also with regard to being automatically adjusted to setting roll gap to F2 ~ F7 frame, roll-force revises; If front end frame selects is F3, then the setting roll gap of F3 ~ F7 frame, roll-force are revised; By that analogy, which frame is leading portion frame select, and adaptation function is a to the last frame from this frame just.
The concrete steps of hot-tandem unit AGC self-adaptation control method are as follows:
1, front end frame is selected is F1 frame;
2, be with steel to enter mm finishing mill unit entrance, AGC setting model is respectively the roll gap of mm finishing mill unit F1 ~ F7 frame, rolling force setup value:
F1Gap_setup～F7Gap_setup：25mm、16mm、10mm、7mm、5mm、4mm、3.5mm；
F1Force_setup～F7 Force _setup：1900ton、2300ton、2400ton、2000ton、1600ton、1200ton、800ton；
3, the roll gap in first 0.5 second of F1 frame Biting Course, roll-force mean value are F1Gap_avg: 24.8mm, F1Force_avg: 2050ton;
4, the proportionality coefficient of adaptation function is calculated: calculate roll gap Proportional coefficient K _ gap(F1Gap_avg/F1Gap_setup that roll gap mean value in first 0.5 second of F1 Biting Course is presetting with AGC setting model), and the Proportional coefficient K _ force (F1Force_avg/F1Force_setup) of roll-force mean value in first 0.5 second of calculating F1 Biting Course and roll-force;
K_gap=F1Gap_avg/F1Gap_setup）=24.8/25=0.992
K_force(F1Force_avg/F1Force_setup)=2050/1900=1.079
5, roll gap, the rolling force setup value of F1 ~ F7 frame is revised: roll gap F1 ~ F7 frame set, rolling force value F1Gap_setup ~ F7Gap_setup, F1Force_setup ~ F7 Force _ setup are modified to F1Gap_setup × K_gap ~ F7Gap_setup × K_gap, F1Force_setup × K_force ~ F7 Force _ setup × K_force
The fixed value of roller slit of revised F1 ~ F7 frame: 24.8mm, 15.872mm, 9.92mm, 6.994mm, 4.96mm, 3.968mm, 3.472mm;
F1 ~ F7 frame rolling force setup value after revising: 2050ton, 2481ton, 2589ton, 2158ton, 1726ton, 1295ton, 863ton;
6, the roll gap of revised F1 ~ F7 frame, rolling force setup value are applied in thickness gauge AGC control.
The present invention by F1 ~ F7 frame setting roll gap, roll-force correction, have modified the setting deviation of AGC setting model to mm finishing mill unit roll gap, roll-force, achieve mm finishing mill unit AGC adaptive control function, improve the control accuracy of F1 ~ F7 frame thickness gauge AGC, finally achieve the object improving strip steel head thickness control accuracy.
Claims (2)
1. a hot-tandem unit AGC self-adaptation control method, is characterized in that comprising the following steps:
1), when being with steel to enter mm finishing mill unit entrance, each group frame receives AGC setting model presetting gap values between rollers, rolling force value;
2), select one, mm finishing mill unit front end frame, when this frame stings steel, automation control system collects roll gap, roll-force data in first 0.5 second of this frame Biting Course, and calculates its roll gap mean value, roll-force mean value;
3), calculate the roll gap mean value stung in first 0.5 second of the steel frame Biting Course each frame roll gap proportionality coefficient presetting with AGC setting model, and the proportionality coefficient of roll-force mean value in first 0.5 second of steel frame Biting Course and the presetting each frame roll-force of AGC setting model is stung in calculating;
4), in automation control system, the gap values between rollers each group of frame set, rolling force value are multiplied by step 3 corresponding proportion coefficient respectively to be revised, and is applied in the thickness gauge AGC control of frame.
2. a kind of hot-tandem unit AGC self-adaptation control method according to claim 1, it is characterized in that front end frame is optional, if F1 frame roll gap, roll-force checkout equipment exist abnormal, the inaccurate of adaptation function will be caused, at this moment F2 frame just can be selected as front end frame, adaptation function also with regard to being automatically adjusted to setting roll gap to F2 and follow-up frame thereof, roll-force revises; If front end frame selects is F3, then the setting roll gap of F3 and follow-up frame thereof, roll-force are revised; By that analogy, which frame is leading portion frame select, and adaptation function is a to the last frame from this frame just.
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| CN108941207A (en) * | 2018-06-04 | 2018-12-07 | 北京金自天正智能控制股份有限公司 | A kind of hot fine rolling model process control subsystem and method |
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| CN108941207A (en) * | 2018-06-04 | 2018-12-07 | 北京金自天正智能控制股份有限公司 | A kind of hot fine rolling model process control subsystem and method |
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