CN106984651B - A kind of on-line control system improving rolled piece thickness control accuracy - Google Patents
A kind of on-line control system improving rolled piece thickness control accuracy Download PDFInfo
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- CN106984651B CN106984651B CN201710382616.3A CN201710382616A CN106984651B CN 106984651 B CN106984651 B CN 106984651B CN 201710382616 A CN201710382616 A CN 201710382616A CN 106984651 B CN106984651 B CN 106984651B
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- rolled piece
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
- B21B37/18—Automatic gauge control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
- B21B37/18—Automatic gauge control
- B21B37/20—Automatic gauge control in tandem mills
Abstract
The present invention provides a kind of on-line control system for improving rolled piece thickness control accuracy, the system utilizes rolling-mill housing entrance side rolled piece temperature measuring equipment and milling train outlet side rolled piece measuring thickness device, calculating is compensated to roller gap in real time, specifically: according to rolled piece thermometric and measuring thickness device measurement data, calculate influence coefficient of the rolled piece plastic processing temperature relative to rolled piece thickness change；To which the variable value for the milling train outlet side rolled piece thickness that rolled piece is generated by temperature change be calculated；Meanwhile the influence that rolled piece physical property is generated using material physical properties correction value compensation processing temperature；Real-time compensation control is carried out to roller gap by roller gap deviation calculated result.The problem of thickness control accuracy difference, the thickness control accuracy of different-thickness specification improve 2% or more caused by the present invention can be eliminated because of rolled piece plastic processing non-uniform temperature.
Description
Technical field
The invention belongs to Metal Forming control fields, and in particular to a kind of to improve the online of rolled piece thickness control accuracy
Control system.
Background technique
Rolled piece thickness indication controls one of most important quality index of rolled piece, and the factor for influencing thickness control mainly have with
Under several aspects: board briquette variation, the variation of strip tension, speed influence, roll gap variation etc..In the production of hot-strip
In, gauge automatic control (AGC) is one of the main means for improving thickness control accuracy, therefore completely gauge automatic control system
System, it is necessary to fully consider influence of the various factors to thickness control, and there is corresponding compensation function to be eliminated.
Currently, automatic gauge control system is broadly divided into two kinds of control modes of GM-AGC and MN-AGC.Wherein GM-AGC mould
Formula considers the factors such as roll state, mill speed, interstand tension, and MN-AGC then passes through the steel strip thickness of actual measurement to GM-
AGC is modified.
In above-mentioned rolled piece method for controlling thickness, the rolled piece thickness prediction H of used milling train outlet side:
H=F/M+Sr
Wherein: H indicates that the milling train outlet side rolled piece thickness of prediction, F indicate the roll-force that milling train applies rolled piece, M table
Show mill stiffness, SrIt is expressed as the compensation carried out to mill roll-gap position.Wherein, offset S mill roll-gap position carried outr:
SR=S0+SWRS+SRW+SRH
Wherein: SrIt include following several breast roller roll gap compensation: S0It is expressed as breast roller roll gap mark zero；SWRSFor machine
Frame roll generated breast roller roll shifting offset in transverse shifting；SRWFor in rolled piece production process to rolled piece to machine
The wear-compensating value that frame roller surface generates；SRHIt is swollen that breast roller heat is generated for breast roller temperature change in the rolled piece operation of rolling
Swollen offset.Therefore, in above-mentioned rolled piece method for controlling thickness to the rolled piece hardness caused by by rolled piece plastic processing temperature change
Variation, i.e., rolled piece change in physical does not make any consideration.
Patent CN103934278A discloses a kind of method using computer program control hot fine rolling band steel thickness, root
According to the detected value of the rolling actual achievement Value Data of rack, the steel strip thickness of computer rack outlet；Track the calculating steel strip thickness of rack
At the time of data reach rack, in conjunction with the rolling actual achievement Value Data of rack, plastic coefficient when strip passes through rack is calculated in real time；
According to resulting strip plastic coefficient is calculated in real time, rack adjustment amount of roll gap is determined, real-time feedforward control is carried out to steel strip thickness.
Although the patent can obtain the strip plastic coefficient of one piece of rolled band steel difference section, that is, considers rolled piece firmness change and draw
The strip plastic coefficient variation risen, still, in the technical solution, FxRack adjustment amount of roll gap is according to thickness control deviation and band
Steel plastic coefficient is calculated, not in view of roll oil film thickness, roll roll shifting, roll bending roller force, roller surface abrasion, rolling
Influence of the thermal expansion of rollers to roller gap in the process is modified only with fixed compensation value.Therefore, the method for the patent is still
It is poor to will cause milling train outlet side steel strip thickness control precision.Meanwhile the control method may be only available for the tandem rolling of 2 framves or more
In rack, it is not suitable for the thickness control of singlestandmill.
Summary of the invention
The purpose of the present invention is to provide a kind of on-line control systems for improving rolled piece thickness control accuracy, are rolled by utilizing
Machine rack entrance side rolled piece temperature measuring equipment and milling train outlet side rolled piece measuring thickness device, compensate calculating to roller gap in real time,
Rolled piece thickness control accuracy is poor caused by eliminating because of rolled piece plastic processing temperature unevenness.
In order to solve the above technical problems, the following technical solution of the present invention:
A kind of on-line control system improving rolled piece thickness control accuracy includes: at least 1 rolling mill 4, rolled piece temperature measuring equipment
2, rolled piece measuring thickness device 3 and rolled piece device for automatically control thickness 7, rolled piece temperature measuring equipment 2 are located at inlet of rolling mill side 5, and rolled piece is surveyed
Thick device 3 is located at milling train outlet side 6；Rolled piece device for automatically control thickness 7 includes: computational plasticity processing temperature change rate and thickness
The influence coefficient calculation unit S100 of influence of fluctuations coefficient, the temperature of computational plasticity processing temperature deviation and thickness fluctuation offset
Thickness compensation computing unit S200；Calculate the material physical properties amending unit S300 of material physical properties parameter offset；Meter
The roller gap deviation for calculating roller gap deviation calculates cell S 400.
Further, in the S100 of the on-line control system of the raising rolled piece thickness control accuracy, by milling train outlet side 6
Rolled piece measuring thickness device 3 measure rolled piece Thickness sensitivity value and target thickness deviation and inlet of rolling mill side 5 rolled piece thermometric
The rolled piece plastic processing rate of temperature change that device 2 measures establishes plastic processing temperature deviation and rolled piece target thickness as variable
The relation function of deviation.
Further, it in the S200 of the on-line control system of the raising rolled piece thickness control accuracy, is fallen into a trap using S100
It calculates as a result, calculating prediction δ Ht+ΔtAnd to eliminate δ Ht+ΔtRequired rolling-mill housing thickness compensation deviation δ h't+Δt:
δHt+Δt=Inf_coe × δ Tt+Δt+δHt；
Wherein: δ HtThe rolled piece thickness and target control detected for the rolled piece measuring thickness device 3 of milling train outlet side 6 under t moment is thick
The deviation of degree；δHt+ΔtFor inscribed when t+ Δ t (Δ t > 0) milling train outlet side 6 rolled piece measuring thickness device 3 detect rolled piece thickness with
The deviation of target control thickness；δTt+ΔtIt is detected to inscribe the rolled piece temperature measuring equipment 2 of inlet of rolling mill side 5 when t+ Δ t (Δ t > 0)
Rolled piece plastic processing rate of temperature change；M is mill modulus；Q is rolled piece material plasticity coefficient.
Further, in the S300 of the on-line control system of the raising rolled piece thickness control accuracy, using different materials
Expect physical property parameter correction values, calculates the deviation δ of t+ Δ t and 6 rolled piece thickness control of the moment milling train of Δ t > 0 outlet side
ht+Δt:
δht+Δt=δ h't+Δt×α；
Wherein δ ht+ΔtFor the deviation of 6 rolled piece thickness control of t+ Δ t (Δ t > 0) moment milling train outlet side；α is material object
Rationality matter parameter correction values；δh't+ΔtTo eliminate δ Ht+ΔtRequired rolling-mill housing thickness compensation deviation.
Further, in the S400 of the on-line control system of the raising rolled piece thickness control accuracy, t+ Δ t and Δ are calculated
The moment roller gap bias compensation value δ of t > 0 St+Δt:
Wherein δ St+ΔtFor t+ Δ t (Δ t > 0) moment roller gap bias compensation value；δht+ΔtGo out for t+ time Δt milling train
The deviation of mouth side (6) rolled piece thickness control；M is mill modulus；Q is rolled piece material plasticity coefficient.
Compared with prior art, the present invention at least has the following beneficial effects:
1. the present invention is set up using rolling-mill housing entrance side rolled piece temperature measuring equipment with milling train outlet side rolled piece measuring thickness device
Rolled piece plastic processing temperature variation and the influence coefficient of rolled piece amounts of thickness variation are modified breast roller roll gap, can disappear
Except milling train outlet side rolled piece thickness and target control thickness deviation is made because of rolled piece plastic processing temperature unevenness, it is whole thick to improve rolled piece
Degree control precision；
2. the present invention is both applicable to Continuous mill train, it can also be used to be a kind of in the rolled piece thickness control of singlestandmill
Wide adaptation range and directly effective method for controlling thickness；
3. the implementation of basic automatization controller programming can be used in the present invention, do not need to carry out more existing equipment or controller
Changing or being transformed can be realized, and be a kind of method of economic and reliable.
Detailed description of the invention
Fig. 1 is to indicate present device device and control flow chart,
Wherein, 1- rolled piece, 2- rolled piece temperature measuring equipment, 3- rolled piece measuring thickness device, 4- milling train, 5- inlet of rolling mill side, 6- milling train
Outlet side, 7- rolled piece device for automatically control thickness；
Fig. 2 is Strip1 coiled strip steel thickness control aberration curve；
Fig. 3 is Strip2 coiled strip steel thickness control aberration curve.
Specific embodiment
For better understanding of above-mentioned technical proposal of the invention, carry out with reference to the accompanying drawings and examples further
Detailed description.
Fig. 1 be present device device and control flow chart, it is known that the present invention in improve rolled piece thickness control accuracy
Line control system includes: that rolled piece 1, at least 1 rolling mill 4, the rolled piece temperature measuring equipment 2 of inlet of rolling mill side 5, milling train outlet side 6 roll
Part measuring thickness device 3 and rolled piece device for automatically control thickness 7；Rolled piece device for automatically control thickness 7 includes: computational plasticity processing temperature
Spending change rate and thickness fluctuation influences the influence coefficient calculation unit S100 of coefficient, computational plasticity processing temperature deviation and thickness wave
The temperature thickness compensation computing unit S200 of dynamic offset；The material physical properties for calculating material physical properties parameter offset are repaired
Positive unit S300；The roller gap deviation for calculating roller gap deviation calculates cell S 400.
Influence the rolled piece Thickness sensitivity for the rolled piece measuring thickness device 3 of milling train outlet side 6 being measured in coefficient calculation unit S100
The rolled piece temperature measuring equipment 2 of the deviation and inlet of rolling mill side 5 of value and target thickness measures rolled piece plastic processing rate of temperature change and makees
For variable, the plastic processing temperature deviation of foundation and the relation function of rolled piece target thickness deviation.
In temperature thickness compensation computing unit S200, milling train outlet side δ H is predicted using calculating in S100 as a result, calculatingt+Δt
And to eliminate δ Ht+ΔtRequired rolling-mill housing thickness compensation deviation δ h't+Δt:
δHt+Δt=Inf_coe × δ Tt+Δt+δHt；
Wherein: δ HtThe rolled piece thickness and target control detected for the rolled piece measuring thickness device 3 of milling train outlet side 6 under t moment is thick
The deviation of degree；δHt+ΔtFor inscribed when t+ Δ t (Δ t > 0) milling train outlet side 6 rolled piece measuring thickness device 3 detect rolled piece thickness with
The deviation of target control thickness；δTt+ΔtIt is detected to inscribe the rolled piece temperature measuring equipment 2 of inlet of rolling mill side 5 when t+ Δ t (Δ t > 0)
Rolled piece plastic processing rate of temperature change；M is mill modulus；Q is rolled piece material plasticity coefficient.
In material physical properties amending unit S300, using different material physical properties parameter correction values, t+ Δ t is calculated
And the deviation δ h of 6 rolled piece thickness control of the moment milling train of Δ t > 0 outlet sidet+Δt:
δht+Δt=δ h't+Δt×α；
Wherein δ ht+ΔtFor the deviation of 6 rolled piece thickness control of t+ Δ t (Δ t > 0) moment milling train outlet side；α is material object
Rationality matter parameter correction values.
Roller gap deviation calculates in cell S 400, calculates t+ Δ t and the moment roller gap bias compensation value of Δ t > 0 δ
St+Δt:
Wherein δ St+ΔtFor t+ Δ t (Δ t > 0) moment roller gap bias compensation value.
The following are the on-line control systems that rolled piece thickness control accuracy is improved using the present invention to eliminate rolled piece plastic processing temperature
The different specific steps that thickness control accuracy is influenced of degree:
1 starting point of rolled piece passes through milling train 4 and the rolled piece measuring thickness device 3 in rack outlet side 6, detects that rolled piece is actually active
5s after data starts rolled piece device for automatically control thickness 7；When the rolled piece temperature measuring equipment 2 of rack entrance side 5 detects obtained rolled piece
When 1 end plastic processing temperature data is invalid, stop rolled piece thickness self-control device 7.
The rolled piece thickness and target for detecting the 6 rolled piece measuring thickness device 3 of milling train outlet side at current time (t moment) in S100
Control the deviation δ H of thicknesstThe rolled piece plastic temperature change rate obtained with same 5 rolled piece temperature measuring equipment 2 of period rolling-mill housing entrance side
δTtConstitute first differential function.By above-mentioned derivation, function calculated result can be used as rolled piece plastic temperature influence function value
Inf_coe。
According to S100 calculated result in S200, t+ Δ t (Δ t=200ms) moment is predicted, 6 δ H of milling train outlet sidet+Δt:
δHt+Δt=Inf_coe × δ Tt+Δt+δHt,
Wherein, δ HtThe rolled piece thickness and target control thickness detected for 6 rolled piece measuring thickness device 3 of milling train outlet side under t moment
Deviation, δ Ht+ΔtFor inscribed when t+ Δ t (Δ t=200ms) 6 rolled piece measuring thickness device of milling train outlet side detection rolled piece thickness with
The deviation of target control thickness；δTt+ΔtTo inscribe the detection of 5 rolled piece temperature measuring equipment 2 of inlet of rolling mill side when t+ Δ t (Δ t=200ms)
Rolled piece plastic processing rate of temperature change.
By rolled piece thickness deviation δ Ht+ΔtIt obtains inscribing when t+ Δ t (Δ t=200ms) and eliminates δ Ht+ΔtRequired milling train machine
Frame thickness compensation deviation δ h't+Δt:
Wherein, δ h't+ΔtTo eliminate δ Ht+ΔtRequired rolling-mill housing thickness compensation deviation；M is mill modulus,
Q is rolled piece material plasticity coefficient.
Since the plastic processing rate of temperature change of the rolled piece 1 of different components system and the variable quantity of resistance of deformation are in the presence of poor
It is different.
The rolled piece 1 of close composition system is divided into together by S300 by being finely divided the rolled piece 1 of different components system
One steel grade race, different steel grade races uses different material physical properties parameter correction values, when t+ Δ t and Δ t > 0 is calculated
Carve the deviation δ h of milling train outlet side (6) rolled piece thickness controlt+Δt:
δht+Δt=δ h't+Δt× α,
Wherein δ ht+ΔtFor the deviation of 6 rolled piece thickness control of t+ Δ t (Δ t > 0) moment milling train outlet side；α is material object
Rationality matter parameter correction values.
S400 is according to the deviation δ of the 6 rolled piece thickness control of t+ Δ t (Δ t > 0) moment milling train outlet side being calculated
ht+Δt, determine t+ Δ t and the moment roller gap bias compensation value δ of Δ t > 0 St+Δt:
Tandem mill of the on-line control system of raising rolled piece thickness control accuracy of the invention in 1700mm hot rolling line
The last rack F6 of group is carried out, and the belt steel temperature detection device before last rack F6 and last rack outlet side steel strip thickness are examined
It surveys device and collectively forms measured data, and carry out the On-line Control of steel strip thickness.After the present invention is implemented, 1700mm hot rolling line
Steel strip thickness control precision significantly improve.
Compare as analysis, carried out respectively not using the present invention and use method for controlling thickness of the invention, to actual
The identical steel grades of volume two, specification strip finished product thickness curve compare.Wherein, steel grade shown in comparing is all J40BNNB2, and
The plastic processing temperature trend for carrying out the strip of analysis comparison is close, and target finished product thickness is all 3.75mm.
The steel strip thickness controlling curve not rolled using the present invention is as shown in Fig. 2, from fig. 2 it can be seen that strip is thick
The plastic processing temperature for spending control deviation and strip is closely related, and the two is integrally fluctuated in the presence of negatively correlated trend: Strip1 volumes
There is peak value, overproof 100um in plastic processing temperature low spot steel strip thickness in strip, and it is 96.1% (control that integral thickness, which controls precision,
Deviation 50um processed).The steel strip thickness controlling curve rolled using the present invention is as shown in figure 3, as can see from Figure 3:
Strip2 volumes, with Strip1 coiled strip steel plastic processing temperature fluctuation similar temperament, all has plastic processing temperature low spot, but Strip2
Thickness control deviation wave crest corresponding to the plastic processing temperature low spot of volume has been eliminated, this volume thickness control aberration curve obtains
It is obviously improved, integral thickness control precision reaches 98.5% (control deviation 50um).The present invention that table 1 show comes into operation front and back steel grade
For the thickness control accuracy statistical data of J40BNNB2.
The implementation result of the present invention of table 1
It can be seen from Table 1 that: after the present invention comes into operation, the thickness control accuracy of different-thickness specification can be improved 2% or more.
Although the open section Example of the present invention, is not for limiting the present invention.The present invention can also have other more
Kind embodiment, those skilled in the art can be made into various corresponding changes according to the present invention, but these corresponding changes are all answered
Belong to the protection scope of claim appended by the present invention.
Claims (3)
1. it is a kind of improve rolled piece thickness control accuracy on-line control system, which is characterized in that the on-line control system include: to
Few 1 rolling mill (4), rolled piece temperature measuring equipment (2), rolled piece measuring thickness device (3) and rolled piece device for automatically control thickness (7), rolled piece
Temperature measuring equipment (2) is located at inlet of rolling mill side (5), and rolled piece measuring thickness device (3) is located at milling train outlet side (6)；Rolled piece thickness is controlled automatically
Device (7) processed includes: the influence coefficient calculation unit S100 that computational plasticity processing temperature change rate and thickness fluctuation influence coefficient,
The temperature thickness compensation computing unit S200 of computational plasticity processing temperature deviation and thickness fluctuation offset；Calculate Material Physics
The material physical properties amending unit S300 of matter parameter offset；Calculate the roller gap deviation computing unit of roller gap deviation
S400；In S100, rolled piece Thickness sensitivity value and target thickness that the rolled piece measuring thickness device (3) of milling train outlet side (6) is measured
Deviation and inlet of rolling mill side (5) the rolled piece plastic processing rate of temperature change that measures of rolled piece temperature measuring equipment (2) as variable,
Establish the relation function of plastic processing temperature deviation and rolled piece target thickness deviation；In s 200, using in S100 calculate as a result,
Calculate prediction δ Ht+ΔtAnd to eliminate δ Ht+ΔtRequired rolling-mill housing thickness compensation deviation δ h't+Δt:
δHt+Δt=Inf_coe × δ Tt+Δt+δHt；
Wherein: δ HtIt is thick for the rolled piece thickness of rolled piece measuring thickness device (3) detection of milling train outlet side (6) and target control under t moment
The deviation of degree；δHt+ΔtIt is thick to inscribe the rolled piece that the rolled piece measuring thickness device (3) of milling train outlet side (6) detects when t+ Δ t and Δ t > 0
The deviation of degree and target control thickness；Inf_coe is rolled piece plastic temperature influence function value；δTt+ΔtWhen for t+ Δ t and Δ t > 0
Inscribe the rolled piece plastic processing rate of temperature change of rolled piece temperature measuring equipment (2) detection of inlet of rolling mill side (5)；M is mill stiffness system
Number；Q is rolled piece material plasticity coefficient.
2. the on-line control system according to claim 1 for improving rolled piece thickness control accuracy, which is characterized in that described
In S300, using different material physical properties parameter correction values, t+ Δ t and Δ t > 0 moment milling train outlet side (6) rolled piece are calculated
The deviation δ h of thickness controlt+Δt:
δht+Δt=δ h't+Δt×α；
Wherein α is material physical properties parameter correction values.
3. the on-line control system according to claim 2 for improving rolled piece thickness control accuracy, which is characterized in that described
In S400, t+ Δ t and the moment roller gap bias compensation value δ of Δ t > 0 S are calculatedt+Δt:
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109141611B (en) * | 2018-08-16 | 2020-11-10 | 马鞍山钢铁股份有限公司 | Method for automatically checking weight of steel coil |
| CN109821909B (en) * | 2019-02-27 | 2020-07-28 | 江苏省沙钢钢铁研究院有限公司 | Method for controlling thickness deviation of two sides of wide and thick plate |
| CN110008601B (en) * | 2019-04-09 | 2023-09-26 | 鞍钢股份有限公司 | Hot rolling AGC system based on product quality comprehensive coordination control |
| CN111054762B (en) * | 2019-12-09 | 2021-05-04 | 铜陵有色金属集团股份有限公司金威铜业分公司 | Method for quickly controlling target thickness of plate and strip mill |
| CN112808780A (en) * | 2020-12-31 | 2021-05-18 | 浦项(张家港)不锈钢股份有限公司 | Method for calculating rolling target thickness of cold rolling mill |
| CN113843286A (en) * | 2021-08-31 | 2021-12-28 | 欧开来 | Optical fiber sensing intelligent monitoring system |
| CN117019882B (en) * | 2023-08-24 | 2024-04-16 | 北京科技大学 | Automatic thickness feedforward control method for strip steel cold continuous rolling in consideration of hot rolling incoming material information |
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