CN110125189A - The setting method and computer equipment of cold-strip steel target flatness curve - Google Patents
The setting method and computer equipment of cold-strip steel target flatness curve Download PDFInfo
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- CN110125189A CN110125189A CN201910527827.0A CN201910527827A CN110125189A CN 110125189 A CN110125189 A CN 110125189A CN 201910527827 A CN201910527827 A CN 201910527827A CN 110125189 A CN110125189 A CN 110125189A
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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
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
Abstract
The present invention provides the setting method and computer equipment of a kind of cold-strip steel target flatness curve, the setting method of the cold-strip steel target flatness curve is by first establishing target flatness curve model, the target flatness curve of strip is obtained further according to the actual measurement parameter and downstream treatment process of strip, finally determines that the target flatness for plate shape feedback control is distributed according to interior stress balance condition.The present invention passes through target flatness curve model, provide a variety of datum target plate shape curves, the case where adapting to different downstream treatment process, steel grade, width and thickness belt steel rolling, conducive to the subsequent strip shape quality of raising, and previously given curve coefficients are stored in database, realize full-automatic setting；Come temperature compensated curve and coiling tension compensated curve in conjunction with the measured data at scene, carries out dynamic in real time and compensate, improve the accuracy of compensation；It determines that target flatness is distributed by interior stress balance condition, provides guarantee to obtain ideal target material object strip shape quality.
Description
Technical field
The present invention relates to plate and strip rolling technology fields, more particularly, to a kind of setting side of cold-strip steel target flatness curve
Method and computer equipment.
Background technique
As China's economy develops to high quality, the industries such as automobile, household electrical appliance, electronics, military project and aerospace are to cold
The strip shape quality for rolling Strip proposes more and more harsh requirement, such as automotive sheet and tin plate, generally requires straight
For degree in 5IU or so, electric steel plate then requires straightness within 3IU.With cold-rolled plate and strip intensity raising and thickness into
One step is thinned, and plate shape problem becomes the main problem faced in cold rolled sheet production process.
Target flatness curve is substantially the distribution curve for rolling rear band internal residual stress on strip width direction, is represented
The plate shape condition for rolling rear strip reflects the desired strip shape quality in kind of the producer.In order to obtain the cold rolled sheet of high-quality
Material product, modern cold rolling manufacturing enterprise are widely used advanced plate shape feedback control system.Current plate shape feedback control system
System has had high control precision, can be by straightness deviation stability contorting within 5IU, but since target flatness curve is set
Unreasonablely fixed, leading to not the case where obtaining ideal strip shape quality can be found everywhere.Its reason essentially consists in: on the one hand, plate shape
Feedback control system is provided only with the target flatness curve of limit, is difficult to adapt to the feelings of different steel grades, width and thickness belt steel rolling
Condition, and required almost without in view of difference of the downstream treatment process to plate shape, it is difficult to give full play to downstream production unit
Processing capacity；On the other hand, although target flatness curve has also contemplated and is unevenly distributed to temperature distributing disproportionation and coiling tension
Compensation, but the coefficient of these compensated curves is usually given by experience, often takes coiling tension the mode of static compensation, with reality
Border situation differs greatly, it is difficult to obtain ideal strip shape quality in kind.
Therefore, it is badly in need of a kind of target flatness curve setting technology that can obtain ideal strip shape quality at present.
Summary of the invention
In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide a kind of target flatness curve setting skills
Art scheme, for solving, the strip shape quality because caused by target flatness curve setting is unreasonable is undesirable in the prior art is asked
Topic.
To achieve the above object and other related purposes, the present invention provide a kind of setting of cold-strip steel target flatness curve
Method, comprising steps of
Establish datum target curve model, temperature compensation curve model and coiling tension compensated curve model；
According to the actual measurement parameter of the downstream treatment process of strip and the strip, corresponding datum target curve, temperature are determined
Compensated curve and coiling tension compensated curve are spent, the target flatness curve of the strip is obtained；And
The target for being used for plate shape feedback control is determined according to the target flatness curve of the strip and interior stress balance condition
The distribution of plate shape.
Optionally, described according to the downstream treatment process of strip and the actual measurement parameter of the strip, determine corresponding benchmark
Aim curve, temperature compensation curve and coiling tension compensated curve, the step of obtaining the target flatness curve of the strip include:
According to the downstream treatment process of the strip, steel grade, width and thickness, the datum target curve is determined；
The transverse temperature distribution of the strip is acquired, and is substituted into the temperature compensation curve model, determines the temperature
Spend compensated curve；
The strip crown of the strip is acquired, and is substituted into the coiling tension compensated curve model, is batched described in determination
Tension compensating curve；And
The datum target curve, temperature compensation curve and coiling tension compensated curve is superimposed, obtain the strip
Target flatness curve.
Optionally, the datum target curve model is six order polynomial functions, corresponding calculation formula are as follows:
fbase(x)=a0+a1x+a2x2+a3x3+a4x4+a5x5+a6x6
Wherein, fbase(x) it is benchmark aim curve, indicates the datum target plate shape of the strip；X is returning for the strip
One changes width coordinate, using the widthwise central position of the strip as coordinate origin, -1≤x≤1；a0~a6For coefficient.
Optionally, right respectively according to the difference of the downstream treatment process of strip, steel grade, width range and thickness range
The coefficient assignment of its datum target curve, and the value of the coefficient is saved in the database.
Optionally, described according to the downstream treatment process of the strip, steel grade, width and thickness, determine the benchmark
The step of aim curve includes:
According to the downstream treatment process of the strip, determine the datum target curve embodies form: if described
Downstream treatment process is to take out commercial coil, then the datum target curve is straight line；If the downstream treatment process moves back for bell-type
Fire, then the datum target curve is center notching curve；If the downstream treatment process is continuous hot galvanizing, the benchmark
Aim curve is center convex curves；If the downstream treatment process is continuous annealing, centered on the datum target curve
Convex curves；
According to the steel grade, width and thickness specification of the strip, its corresponding position in the database is determined, read
The coefficient value of corresponding datum target curve substitutes into the datum target curve model.
Optionally, the temperature compensation curve model is quartic polynomial function, corresponding calculation formula are as follows:
fT(x)=b0+b1x+b2x2+b3x3+b4x4
Wherein, fTIt (x) is temperature compensation curve, the transverse temperature for compensating the strip is unevenly distributed the plate shape of generation；X is
The normalization width coordinate of the strip, using the widthwise central position of the strip as coordinate origin, -1≤x≤1；b0~b4For
Coefficient.
Optionally, the transverse temperature distribution of the acquisition strip, and the temperature compensation curve model is substituted into,
The step of determining the temperature compensation curve include:
Acquire the measured value of the transverse temperature distribution of the strip；
The measured value that the transverse temperature of the strip is distributed substitutes into following calculation formula, determines the corresponding temperature of the strip
Spend the coefficient of compensated curve:
fT(x)=b0+b1x+b2x2+b3x3+b4x4=αt·[t(x)-t0]×105
Wherein, αtFor the linear expansion coefficient of the strip；T (x) is the observed temperature of corresponding normalization width coordinate x；t0For
The actual measurement mean temperature of strip width two sides edge,
The coefficient of the corresponding temperature compensation curve of the strip is substituted into the temperature compensation curve model.
Optionally, the coiling tension compensated curve model is quadratic function, corresponding calculation formula are as follows:
Wherein, fCIt (x) is coiling tension compensated curve, plate caused by compensating the strip crown of the strip in coiling process
Shape；X is the normalization width coordinate of the strip, using the widthwise central position of the strip as coordinate origin, -1≤x≤1；β
For model coefficient；C is the strip crown of the strip and the ratio between the thickness of the strip；RcFor the reel radius of coiling machine；N is to work as
The number of plies of preceding band volume；H is the thickness of the strip.
Optionally, described determined according to the target flatness curve and interior stress balance condition of the strip is fed back for plate shape
Control target flatness distribution the step of include:
After the target flatness curve for determining the strip, according to the lateral interior stress balance condition of the stripTo determine the target flatness distribution for plate shape feedback control, it may be assumed that
Wherein, f (xi) it is that the strip passes through compensated target flatness, f (xi)=fbase(xi)+fT(xi)+fC(xi),
fbase(xi) be the strip datum target plate shape, fT(xi) it is to compensate the transverse temperature of the strip to be unevenly distributed generation
Plate shape, fC(xi) it is plate shape caused by compensating the strip crown of the strip in coiling process；f′(xi) it is to feed back to control for plate shape
The target flatness of system is distributed；xiFor the normalization width coordinate of corresponding ith zone；N is the width direction stroke along the strip
Subregional sum.
In addition, to achieve the above object and other related purposes, the present invention also provides a kind of computer equipments, are used for cold rolling
The setting of strip target flatness curve, the calculator device include memory and processor, and the memory is based on storing
Calculation machine program, the processor is for executing the computer program, so that the computer equipment realizes any of the above-described institute
State method.
As described above, the setting method of cold-strip steel target flatness curve of the invention, has the advantages that
1), by the datum target curve model in target flatness curve model, it is bent that a variety of datum target plate shapes are provided
Line, the case where being adapted to different steel grades, width and thickness belt steel rolling, so that the datum target curve setting of strip is more closed
Reason, is conducive to improve subsequent strip shape quality, while considering downstream treatment process and requiring the difference of plate shape, can give full play to down
The processing capacity of trip production unit；
2), by the temperature compensation curve model and coiling tension compensated curve model in target flatness curve model, and
Come temperature compensated curve and coiling tension compensated curve in conjunction with the measured data at scene, carries out dynamic in real time and compensate, mention
The high accuracy of compensation, is conducive to improve subsequent strip shape quality；
3), determine that the target flatness for plate shape feedback control is distributed by interior stress balance condition, so that target flatness
The setting of curve is more reasonable, provides guarantee to obtain ideal target material object strip shape quality.
Detailed description of the invention
Fig. 1 is shown as the structural schematic diagram of six-roll cold mill plate shape feedback control system.
Fig. 2 is shown as the flow diagram of the setting method of target flatness curve in the present invention.
Fig. 3 is shown as the datum target curve of one embodiment of the invention.
Fig. 4 is shown as the temperature distributing disproportionation compensated curve of one embodiment of the invention.
Fig. 5 is shown as the coiling tension compensated curve of one embodiment of the invention.
Fig. 6 is shown as the target flatness curve for plate shape feedback control of one embodiment of the invention.
Component label instructions:
1 strip
2 working rolls
3 intermediate calender rolls
4 support rollers
5 plate shape rollers
6 target flatness setting computers
7 Strip Shape Control computers
A plate shape is distributed live signal
B target flatness curve
C controls signal
Specific embodiment
As it is aforementioned it is mentioned in the background technology, in order to obtain the cold-rolled plate and strip product of high-quality, modern cold rolling is raw
It produces enterprise and is widely used advanced plate shape feedback control system.It is as shown in Figure 1 to be equipped with the six of plate shape feedback control system
Cold mill can be single stand reversible six-roll cold mill, be also possible to cold continuous rolling (including pickling milling train Unit erriger)
Last stand.Wherein, 1 is strip, and 2,3,4 be respectively working roll, intermediate calender rolls and support roller, each 1 up and down, milling train outlet
Plate shape roller 5 carries out after measuring plate shape distribution live signal a with the target flatness curve b that target flatness setting computer 6 exports
Compare, obtained plate shape deviation profile is sent to Strip Shape Control computer 7, is handled by certain mathematical model and control algolithm
Afterwards, Strip Shape Control computer 7 issue control signal c, with adjust roll (working roll 2 and intermediate calender rolls 3) inclination, 2 roller of working roll,
The state etc. of 2 sub-sectional cooling nozzle of 3 roller of intermediate calender rolls and working roll, so that the plate shape to strip 1 carries out real-time control.
In plate shape feedback control system, the setting of target flatness curve is had very important effect, it is plate shape control
The target of system is the desired strip shape quality in kind of operator.But more than the factor due to influencing plate shape in the operation of rolling and pole
It is complicated, if ignoring the influence of these factors, and only sets target flatness curve as the desired target flatness of operator
Distribution, then be often extremely difficult to target.As during the rolling process, it will appear temperature distributing disproportionation along strip width direction, usually
Center temperature is higher, and two sides temperature is lower, to a degree of middle wave occur, finishes placement a period of time in rolling
Afterwards, the temperature on strip width direction is consistent, and middle wave can disappear automatically；If controlled to the middle wave occurred in the operation of rolling
System then just will appear bilateral unrestrained flatness defect in band volume completely after cooling.For another example due to the presence with plate crown, batch
Speed difference can occur in width direction in the process, so as to cause tension difference, cause a degree of middle wave to occur, with coiling band
The increase of steel layer number, this middle unrestrained defect can also be increased further；If be not controlled to this middle unrestrained defect, in finished product
In, increasingly severe middle unrestrained defect can be showed along the longitudinal direction of strip.
Current plate shape feedback control system has had high control precision, and straightness deviation stability contorting can exist
Within 5IU, but due to target flatness curve setting obtain it is unreasonable, lead to not the case where obtaining ideal strip shape quality frequently all
It is.Its reason essentially consists in: on the one hand, plate shape feedback control system is provided only with the target flatness curve (such as 10) of limit,
It is difficult the case where adapting to different steel grades, width and thickness belt steel rolling, and almost without in view of downstream treatment process is to plate
The different of shape require, it is difficult to give full play to the processing capacity of downstream production unit；Selection to target flatness curve is also with behaviour
The experience for making personnel is selected by hand, is not carried out full-automatic setting.On the other hand, although target flatness curve has also contemplated to temperature
Degree is unevenly distributed the compensation being unevenly distributed with coiling tension, but the coefficient of these compensated curves is usually given by experience, to batching
Tension often takes the mode of static compensation, differs greatly with actual conditions, it is difficult to obtain ideal strip shape quality in kind.More than
Two aspect factors are also the main reason for causing domestic many manufacturing enterprises plate shape feedback control system application effect bad.
Based on this, as shown in Fig. 2, the present invention provides a kind of setting method of cold-strip steel target flatness curve, including step
It is rapid:
S1, datum target curve model, temperature compensation curve model and coiling tension compensated curve model are established；
S2, according to the downstream treatment process of strip and the actual measurement parameter of the strip, determine corresponding datum target curve,
Temperature compensation curve and coiling tension compensated curve obtain the target flatness curve of the strip；And
S3, the mesh for being used for plate shape feedback control is determined according to the target flatness curve and interior stress balance condition of the strip
The distribution of target shape.
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Disclosed content understands further advantage and effect of the invention easily.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.
Fig. 1 is please referred to Fig. 6.It should be noted that diagram provided in the present embodiment only illustrates this in a schematic way
The basic conception of invention, only shown in schema then with related component in the present invention rather than package count when according to actual implementation
Mesh, shape and size are drawn, when actual implementation kenel, quantity and the ratio of each component can arbitrarily change for one kind, and its
Assembly layout kenel may also be increasingly complex.
Further, it is to be appreciated that one or more method and step mentioned in the present invention does not repel in the combination
Other method steps can also be inserted into before and after step there may also be other method and steps or between these explicitly mentioned steps
Suddenly, unless otherwise indicated；It should also be understood that the combination connection relationship between one or more equipment/devices mentioned in the present invention
Two specifically mentioned there may also be other equipment/devices before and after the unit equipment/device or at these are not repelled
Other equipment/devices can also be inserted between equipment/device, unless otherwise indicated.Moreover, unless otherwise indicated, each method step
Rapid number is only to identify the convenient tool of various method steps, rather than for the arrangement order of limitation various method steps or limit this hair
Bright enforceable range, relativeness are altered or modified, without material changes in technical content, when being also considered as this
Invent enforceable scope.
Fig. 2 is referred to, the present invention provides a kind of setting method of cold-strip steel target flatness curve.
Firstly, executing step S1 before carrying out target flatness curve setting to certain specific specification strip steel, establishing one
Suitable for the target flatness curve model of a variety of strips, the target flatness curve model includes datum target curve model, temperature
Compensated curve model and coiling tension compensated curve model are spent, that is, needs to establish datum target curve model, temperature compensation curve
Model and coiling tension compensated curve model, and then the target flatness curve of strip is divided into datum target curve and compensated curve
(including temperature compensation curve and coiling tension compensated curve) two parts.
Optionally, the datum target curve model is six order polynomial functions, corresponding calculation formula are as follows:
fbase(x)=a0+a1x+a2x2+a3x3+a4x4+a5x5+a6x6…………………(1)
Wherein, fbase(x) it is benchmark aim curve, indicates the datum target plate shape of strip, IU；X is the normalization of strip
Width coordinate, using the widthwise central position of strip as coordinate origin, -1≤x≤1；a0~a6For coefficient.
Further, since downstream treatment process, steel grade, width range and the thickness of specific datum target curve and strip
Specification is related, after establishing the datum target curve model, according to the downstream treatment process of strip, steel grade (yield strength
Range), the difference of width range and thickness range, first to different downstream treatment process, steel grade (yield strength range), wide
Degree range and thickness range, which divide, builds group, then respectively to the coefficient assignment of its datum target curve, and by the coefficient
Value be stored in database (such as database of target flatness setting computer 6), in order to subsequent calls.
Optionally, the temperature compensation curve model is quartic polynomial function, corresponding calculation formula are as follows:
fT(x)=b0+b1x+b2x2+b3x3+b4x4………………………………………(2)
Wherein, fTIt (x) is temperature compensation curve, the transverse temperature for compensating strip is unevenly distributed the plate shape of generation, IU；b0~
b4For coefficient.
Optionally, during strip coiling, it is present such that with coil of strip exterior feature be in convex along axial direction due to strip profile,
Reeling radius is caused along axial direction etc., make strip in coiling transversely on there are speed difference generate additional stress, be based on this,
The coiling tension compensated curve model is quadratic function, corresponding calculation formula are as follows:
Wherein, fCIt (x) is coiling tension compensated curve, plate shape caused by compensating the strip crown of strip in coiling process,
IU；β is model coefficient；C is the ratio between strip crown and thickness of strip of strip；RcFor the reel radius of coiling machine, mm；N is to work as
The number of plies of preceding band volume；H is the thickness of strip, mm.
It is understood that the datum target curve model, temperature compensation curve model and coiling tension compensated curve
Model is mainly obtained can there is other different function representation forms, details are not described herein by theoretical knowledge combination priori knowledge.
In addition, being used for the present invention also provides a kind of computer equipment (target flatness setting computer 6 as shown in Figure 1)
The setting of cold-strip steel target flatness curve, the computer equipment include: processor, memory, transceiver, communication interface and
System bus；Memory and communication interface pass through system bus and mutual communication are connect and completed with processor and transceiver,
Memory is for storing computer program, and communication interface is used for and other equipment are communicated, and processor and transceiver are for holding
The setting method of cold-strip steel target flatness curve in the present invention is realized when the row computer program.
Wherein, above system bus can be Peripheral Component Interconnect STD bus or expanding the industrial standard structure bus etc.,
The system bus can be divided into address bus, data/address bus, control bus etc.；Above-mentioned communication interface is for realizing database access
Communication between device and other equipment；Above-mentioned memory may include random access memory, it is also possible to further include non-volatile
Property memory, for example, at least a magnetic disk storage；Above-mentioned processor can be at general processor such as central processing unit, network
Device etc. is managed, can also be digital signal processor, specific integrated circuit, field programmable gate array or other programmable logic
Device, discrete gate or transistor logic, discrete hardware components.
Secondly, carrying out target flatness curve setting to certain specific specification strip steel, step S2 is executed, according under strip
The actual measurement parameter for swimming treatment process and the strip, determines corresponding datum target curve, temperature compensation curve and coiling tension
Compensated curve obtains the target flatness curve of the strip.
In detail, as shown in Fig. 2, obtaining the target flatness curve of the strip according to the target flatness curve model
Step S2 further comprises:
S21, according to the downstream treatment process of the strip, steel grade, width and thickness, determine the datum target curve；
The transverse temperature distribution of S22, the acquisition strip, and the temperature compensation curve model is substituted into, determine institute
State temperature compensation curve；
The strip crown of S23, the acquisition strip, and the coiling tension compensated curve model is substituted into, described in determination
Coiling tension compensated curve；And
It is S24, the datum target curve, temperature compensation curve and coiling tension compensated curve is superimposed, it obtains described
The target flatness curve of strip.
In more detail, determine that the step S21 of the datum target curve further comprises:
S211, according to the downstream treatment process of the strip, determine the datum target curve embodies form:
If 1), the downstream treatment process is to take out commercial coil, the datum target curve is straight line；If 2), the downstream processing
Process is bell-type annealing, then the datum target curve is center notching curve (micro- Bian Lang)；If 3), the downstream treatment process
For continuous hot galvanizing, then the datum target curve is center convex curves (micro- middle wave)；If 4), the downstream treatment process is
Continuous annealing, then the datum target curve is center convex curves (micro- middle wave)；
S212, its correspondence position in the database is determined according to the steel grade, width and thickness specification of the strip
It sets, substitutes into the datum target curve model, i.e. formula (1) after reading the coefficient value of corresponding datum target curve, so that it may
To the datum target curve of the strip.
In more detail, determine that the step S22 of the temperature compensation curve further comprises:
S221, using infrared radiation thermometer or the temperature measurement on-line instrument being mounted in rack, acquire the transverse temperature of the strip
The measured value of distribution；
S222, the measured value for being distributed the transverse temperature of the strip substitute into following calculation formula, determine the strip pair
The coefficient for the temperature compensation curve answered:
fT(x)=b0+b1x+b2x2+b3x3+b4x4=αt·[t(x)-t0]×105…………………(4)
Wherein, αtFor the linear expansion coefficient of the strip；T (x) is the observed temperature of corresponding normalization width coordinate x, DEG C；
t0For the actual measurement mean temperature of strip width two sides edge,℃；
S223, the coefficient of the corresponding temperature compensation curve of the strip is substituted into the temperature compensation curve model, i.e., it is public
Formula (2).
In step S222, according to formula (2) and formula (4) it is found that needing to measure at least five lateral position (width sides
To) on real-time temperature values, and substitute into formula (4), simultaneous column make equation group, and then find out coefficient b according to the equation group0~
b4Occurrence, then by coefficient b0~b4Occurrence substitute into the temperature compensation curve model, i.e. formula (2), obtain the band
Temperature compensation curve.
In more detail, determine that the step S23 of the coiling tension compensated curve further comprises:
S231, scene obtain the strip crown size of the strip using hand-hold ultrasonic calibrator or online profile gauge,
Or the strip crown measured value sended over using upstream hot tandem, c value is determined according to ratio convexity equal principle；
S232, the measured value of the strip crown of the strip is substituted into the coiling tension compensated curve model, i.e. formula
(3), the corresponding coiling tension compensated curve of the strip is obtained.
Wherein, the current number of plies with volume is then calculated by L1 basic automation systems in real time.
In more detail, the step S24 for determining that the strip passes through compensated target flatness curve includes: by the benchmark
Aim curve, temperature compensation curve and coiling tension compensated curve three are superimposed, obtain the strip by compensated mesh
Target shape curve.That is:
F (x)=fbase(x)+fT(x)+fC(x)…………………………………………………(5)
Wherein, f (x) is target flatness curve, indicates the strip by compensated target flatness, IU；fbase(x) it is
Datum target curve indicates the datum target plate shape of the strip, IU；fT(x) it is temperature compensation curve, compensates the strip
Transverse temperature is unevenly distributed the plate shape of generation, IU；fCIt (x) is coiling tension compensated curve, the strip crown for compensating the strip exists
Plate shape caused by coiling process, IU.
In detail, described determined according to the target flatness curve and interior stress balance condition of the strip is fed back for plate shape
Control target flatness distribution step S3 include:
After the target flatness curve for determining the strip, according to the lateral interior stress balance condition of the stripTo determine the target flatness distribution for plate shape feedback control, it may be assumed that
Wherein, f (xi) it is that the strip passes through compensated target flatness, f (xi)=fbase(xi)+fT(xi)+fC(xi),
IU；fbase(xi) be the strip datum target plate shape, IU；fT(xi) be unevenly distributed to compensate the transverse temperature of the strip
The plate shape of generation, IU；fC(xi) it is plate shape caused by compensating the strip crown of the strip in coiling process, IU；f′(xi) it is to use
It is distributed in the target flatness of plate shape feedback control；xiFor the normalization width coordinate of corresponding ith zone；N is along the strip
Width direction divide region sum.
In one embodiment of the invention, by taking five rack of 1450mm, six roller tandem mills as an example, in going out for last rack
Mouth is equipped with ABB contact plate shape roller, totally 25 measuring sections, each measuring section 52mm.The downstream treatment process packet of cold-rolled products
It includes and takes out commercial coil, bell-type annealing, continuous hot galvanizing and continuous annealing, be specifically defined as shown in table 1:
1 downstream treatment process of table number
| Downstream treatment process number | Treatment process |
| 0 | It takes out commercial coil (chill volume) |
| 1 | Bell-type annealing |
| 2 | Continuous hot galvanizing |
| 3 | Continuous annealing |
Meanwhile the yield strength range of strip is 200MPa~1000MPa, the width range of strip be 800mm~
1800mm, the thickness range of strip are 0.2mm~3.0mm.The steel grade of the strip is divided according to yield strength, between pressing
A grade is divided every 50MPa, i.e., divides 17 grades altogether within the scope of the yield strength；By the width range of the strip into
Row divides, and the width of strip divides a grade by interval 100mm, i.e., is divided into 11 grades in the width range；It will be described
The thickness range of strip is divided, and the thickness of strip is directly proportional to the gap size that it is divided, i.e. its thicker division pair of thickness
The interval answered is bigger, wherein minimum is divided into 0.05mm between dividing, and is divided into 20 grades altogether in this thickness range.It is corresponding
Divided rank is as shown in table 2:
2 strip steel grade of table and specification divided rank
| Steel grade Grade numbers | Yield strength divides | Width Grade numbers | Width divides | Level of thickness number | Thickness divides |
| 1 | ≤200MPa | 1 | ≤800mm | 1 | ≥3.0mm |
| 2 | ≤250MPa | 2 | ≤900mm | 2 | ≥2.6mm |
| 3 | ≤300MPa | 3 | ≤1000mm | 3 | ≥2.3mm |
| 4 | ≤350MPa | 4 | ≤1100mm | 4 | ≥2.0mm |
| 5 | ≤400MPa | 5 | ≤1200mm | 5 | ≥1.8mm |
| 6 | ≤450MPa | 6 | ≤1300mm | 6 | ≥1.6mm |
| 7 | ≤500MPa | 7 | ≤1400mm | 7 | ≥1.4mm |
| 8 | ≤550MPa | 8 | ≤1500mm | 8 | ≥1.2mm |
| 9 | ≤600MPa | 9 | ≤1600mm | 9 | ≥1.0mm |
| 10 | ≤650MPa | 10 | ≤1700mm | 10 | ≥0.9mm |
| 11 | ≤700MPa | 11 | ≤1800mm | 11 | ≥0.8mm |
| 12 | ≤750MPa | 12 | ≥0.7mm | ||
| 13 | ≤800MPa | 13 | ≥0.6mm | ||
| 14 | ≤850MPa | 14 | ≥0.5mm | ||
| 15 | ≤900MPa | 15 | ≥0.45mm | ||
| 16 | ≤950MPa | 16 | ≥0.4mm | ||
| 17 | ≤1000MPa | 17 | ≥0.35mm | ||
| 18 | ≥0.30mm | ||||
| 19 | ≥0.25mm | ||||
| 20 | ≥0.20mm |
According to the downstream treatment process of the strip, steel grade, width and thickness specification divided rank, set in target flatness
The table that can accommodate 4 × 17 × 11 × 20 × 7=104720 value is established in the database of computer 6, it is corresponding to store
Datum target curve coefficients can provide 4 × 17 × 11 × 20=14960 item different datum target curves；Again respectively to it
The coefficient assignment of datum target curve.
When carrying out datum target curve setting to certain specific specification strip steel, successively according to treatment process downstream,
Raw material yield strength (steel grade), width, thickness determine its corresponding position in the database, and read corresponding benchmark mesh
Mark curve coefficients.As downstream treatment process is continuous hot galvanizing, raw material yield strength is 275MPa, specification be 1220mm ×
For the strip of 0.3mm (its raw material specification 1235mm × 2.30mm), datum target curve coefficients are as shown in table 3.
3 downstream process of table be continuous hot galvanizing, yield strength 275MPa,
Specification 1220mm × 0.3mm, datum target curve coefficients
| UNITID | GRADEID | WIDTHID | THICKID | a0 | a1 | a2 | a3 | a4 | a5 | a6 |
| 2 | 3 | 6 | 18 | 0 | 0 | -8 | 0 | -2 | 0 | 0 |
According to the number of downstream treatment process, strip steel grade, width and thickness specification number from target flatness setup algorithm
Automatically corresponding coefficient value is searched in the database of machine 6, is substituted into formula (1), and datum target curve may be expressed as:
fbase(x)=- 8x2-2x4
Its specific curve distribution figure is as shown in Figure 3.
Scene measures the transverse temperature distribution of operation of rolling end rack outlet strip using hand-held infrared radiation thermometer, main
The temperature for measuring five positions is respectively as follows: 44.2 DEG C of transmission side steel edge portion temperature, distance transmission 1/4 position of side portion
47.6 DEG C of temperature of place, 50.4 DEG C of center temperature, distance operates at 1/4 position of side portion 47.4 DEG C of temperature, fore side strip
44.0 DEG C of edge temperature, straightness distribution is converted into according to formula (4), wherein linear expansion coefficient αt=11.9 × 10-6, calculate
To its temperature compensation curve are as follows:
fT(x)=7.497-0.2777x-15.906x2+0.1587x3+8.4093x4
Its specific temperature compensation curve figure is as shown in Figure 4.
Since upstream hot-rolled process does not provide the strip crown measured data of strip, scene is measured using sonigauge
The transverse gage distribution of strip, co-continuous measure 10 coiled strip steels, the strip crown for being averaged to obtain strip is 0.002mm,
So c=0.002/0.3=0.006667, according to formula (3), modulus type factor beta=0.01, then coiling tension compensated curve can
It is write as:
The reel radius R of known coiling machineC=254mm, steel strip thickness h=0.3mm take the different numbers of plies (n) of batching can
Different coiling tension compensated curves is obtained, as shown in Figure 5.
It may be expressed as: by compensated target flatness curve
According to the lateral interior stress balance condition of stripAfter handling above formula, it can be obtained as schemed
Target flatness curve shown in 6, wherein band volume layer number n=2000.
In conclusion the datum target curve model in the target flatness curve model that the present invention passes through foundation, provides
A variety of datum target plate shape curves, the case where being adapted to different downstream treatment process, steel grade, width and thickness belt steel rolling,
So that the datum target curve setting of strip is relatively reasonable, be conducive to improve subsequent strip shape quality, while considering downstream processing
Process requires the difference of plate shape, can give full play to the processing capacity of downstream production unit, and by previously given curve coefficients
It is stored in database, to realize full-automatic setting；By temperature compensation curve model in target flatness curve model and
Coiling tension compensated curve model, and come temperature compensated curve and coiling tension compensation song in conjunction with the measured data at scene
Line carries out dynamic in real time and compensates, so that the setting of the temperature compensation curve of strip and coiling tension compensated curve is relatively reasonable,
Improve the accuracy of compensation；Finally determine that the target flatness for plate shape feedback control is distributed as according to interior stress balance condition
It obtains ideal target material object strip shape quality and provides guarantee.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should be covered by the claims of the present invention.
Claims (10)
1. a kind of setting method of cold-strip steel target flatness curve, which is characterized in that comprising steps of
Establish datum target curve model, temperature compensation curve model and coiling tension compensated curve model；
According to the actual measurement parameter of the downstream treatment process of strip and the strip, determine that corresponding datum target curve, temperature are mended
Curve and coiling tension compensated curve are repaid, the target flatness curve of the strip is obtained；And
The target flatness for being used for plate shape feedback control is determined according to the target flatness curve of the strip and interior stress balance condition
Distribution.
2. the setting method of cold-strip steel target flatness curve according to claim 1, which is characterized in that described according to band
The actual measurement parameter of the downstream treatment process of steel and the strip determines corresponding datum target curve, temperature compensation curve and volume
The step of taking tension compensating curve, obtaining the target flatness curve of the strip include:
According to the downstream treatment process of the strip, steel grade, width and thickness, the datum target curve is determined；
The transverse temperature distribution of the strip is acquired, and is substituted into the temperature compensation curve model, determines that the temperature is mended
Repay curve；
The strip crown of the strip is acquired, and is substituted into the coiling tension compensated curve model, determines the coiling tension
Compensated curve；And
The datum target curve, temperature compensation curve and coiling tension compensated curve is superimposed, obtain the mesh of the strip
Target shape curve.
3. the setting method of cold-strip steel target flatness curve according to claim 2, which is characterized in that the benchmark mesh
Mark curve model is six order polynomial functions, corresponding calculation formula are as follows:
fbase(x)=a0+a1x+a2x2+a3x3+a4x4+a5x5+a6x6
Wherein, fbase(x) it is benchmark aim curve, indicates the datum target plate shape of the strip；X is the normalization of the strip
Width coordinate, using the widthwise central position of the strip as coordinate origin, -1≤x≤1；a0~a6For coefficient.
4. the setting method of cold-strip steel target flatness curve according to claim 2 or 3, which is characterized in that according to band
The difference of the downstream treatment process of steel, steel grade, width range and thickness range respectively assigns the coefficient of its datum target curve
Value, and the value of the coefficient is saved in the database.
5. the setting method of cold-strip steel target flatness curve according to claim 4, which is characterized in that described according to institute
Downstream treatment process, steel grade, width and the thickness for stating strip, the step of determining the datum target curve include:
According to the downstream treatment process of the strip, determine the datum target curve embodies form: if the downstream
Treatment process is to take out commercial coil, then the datum target curve is straight line；If the downstream treatment process is bell-type annealing,
The datum target curve is center notching curve；If the downstream treatment process is continuous hot galvanizing, the datum target
Curve is center convex curves；If the downstream treatment process is continuous annealing, convex centered on the datum target curve
Curve；
According to the steel grade, width and thickness specification of the strip, its corresponding position in the database is determined, read and correspond to
Datum target curve coefficient value, substitute into the datum target curve model.
6. the setting method of cold-strip steel target flatness curve according to claim 2, which is characterized in that the temperature is mended
Repaying curve model is quartic polynomial function, corresponding calculation formula are as follows:
fT(x)=b0+b1x+b2x2+b3x3+b4x4
Wherein, fTIt (x) is temperature compensation curve, the transverse temperature for compensating the strip is unevenly distributed the plate shape of generation；X is described
The normalization width coordinate of strip, using the widthwise central position of the strip as coordinate origin, -1≤x≤1；b0~b4For coefficient.
7. the setting method of cold-strip steel target flatness curve according to claim 6, which is characterized in that the acquisition institute
The transverse temperature distribution of strip is stated, and is substituted into the temperature compensation curve model, determines the step of the temperature compensation curve
Suddenly include:
Acquire the measured value of the transverse temperature distribution of the strip；
The measured value that the transverse temperature of the strip is distributed substitutes into following calculation formula, determines that the corresponding temperature of the strip is mended
Repay the coefficient of curve:
fT(x)=b0+b1x+b2x2+b3x3+b4x4=αt·[t(x)-t0]×105
Wherein, αtFor the linear expansion coefficient of the strip；T (x) is the observed temperature of corresponding normalization width coordinate x；t0It is described
The actual measurement mean temperature of strip width two sides edge,
The coefficient of the corresponding temperature compensation curve of the strip is substituted into the temperature compensation curve model.
8. the setting method of cold-strip steel target flatness curve according to claim 2, which is characterized in that described batch is opened
Force compensating curve model is quadratic function, corresponding calculation formula are as follows:
Wherein, fCIt (x) is coiling tension compensated curve, plate shape caused by compensating the strip crown of the strip in coiling process；x
For the normalization width coordinate of the strip, using the widthwise central position of the strip as coordinate origin, -1≤x≤1；β is mould
Type coefficient；C is the strip crown of the strip and the ratio between the thickness of the strip；RcFor the reel radius of coiling machine；N is current band
The number of plies of volume；H is the thickness of the strip.
9. the setting method of cold-strip steel target flatness curve according to claim 1, which is characterized in that described according to institute
The target flatness curve and interior stress balance condition for stating strip determine the step of target flatness distribution for plate shape feedback control
Include:
After the target flatness curve for determining the strip, according to the lateral interior stress balance condition of the stripTo determine the target flatness distribution for plate shape feedback control, it may be assumed that
Wherein, f (xi) it is that the strip passes through compensated target flatness, f (xi)=fbase(xi)+fT(xi)+fC(xi), fbase
(xi) be the strip datum target plate shape, fT(xi) it is that the transverse temperature of the compensation strip is unevenly distributed the plate shape of generation,
fC(xi) it is plate shape caused by compensating the strip crown of the strip in coiling process；f′(xi) it is for plate shape feedback control
Target flatness distribution；xiFor the normalization width coordinate of corresponding ith zone；N is along the width direction dividing regions of the strip
The sum in domain.
10. a kind of computer equipment, the setting for cold-strip steel target flatness curve, which is characterized in that the calculator is set
Standby includes memory and processor, and the memory is for storing computer program, and the processor is for executing the calculating
Machine program, so that the computer equipment realizes such as any one of claims 1 to 9 the method.
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