CN109772897A - A kind of setting control method improving hot-continuous-rolling strip steel overall length convexity and wedge-shaped precision - Google Patents
A kind of setting control method improving hot-continuous-rolling strip steel overall length convexity and wedge-shaped precision Download PDFInfo
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Abstract
A kind of setting control method improving hot-continuous-rolling strip steel overall length convexity and wedge-shaped precision, pass through the statistics of the setting range at the angle PC when the strip profile that produces to history and good wedge shape, determine the setting upper limit at the angle PC when wedge shape is good, according to statistical result, when the setting of subsequent rolled band steel, the control range at the angle reasonable distribution PC and bending roller force, the upper limit is set using the upper limit at the angle PC counted as the angle PC, after the setting of the angle PC is limited, the part of Crown control scarce capacity is compensated by bending roller force, while meeting Crown control precision, it ensure that the precision of finish rolling outlet wedge shape control.Defect of the angle single use PC as convexity main control means when being controlled the present invention overcomes the setting of traditional PC milling train, for the maximum angle PC used of different cultivars specification limitation, while meeting Crown control required precision, reduce wedge-shaped probability of happening, the convexity and wedge-shaped precision for improving hot-strip product simultaneously, improve hot-strip product quality.
Description
Technical field
The present invention relates in Ferrous Metallurgy production field hot-strip production technology more particularly to a kind of raising hot continuous rolling
The setting control method of strip overall length convexity and wedge-shaped precision.
Background technique
Currently, in the strip production of each Ferrous Metallurgy manufacturing enterprise, measure belt steel product quality important indicator it
One is exactly template, and is used to judge the quality of plate shape, and common two plates shape index refers to convexity and straightness, and with close
The quality requirement of belt steel product is continuously improved in year, and higher requirements are also raised to wedge-shaped degree for part high-precision strip, wherein
As shown in Figure 1, convexity and wedge shape are defined as follows:
1. convexity defines:
C=hc- (he1+he2)/2
2. wedge shape definition:
W=he1-he2
Hc in figure is strip cross section interior thickness, and he1 and he2 are respectively cross section two sides edge thickness.
So-called convexity is also known as strip lateral thickness difference, refers to the thickness difference of Strip in the width direction.Different hot-rolled strips
Steel product, the requirement to convexity is also different, and requirement of the hot-tandem unit to the control of convexity is to guarantee finish rolling outlet band
It by Crown control to target value, and is in the case where guaranteeing convexity, by wedge to the control of wedge shape requirement under conditions of steel is straight
Shape controls within a threshold range.
By finding in the prolonged working experience of execute-in-place worker, in hot continuous rolling production process, it is convex to influence strip
The principal element of degree has roll machinery convexity, and the lateral flow of roller heat convex degree learning, roll wear convexity and strip, these can
Caused convexity variation.Wherein, the factor for influencing roll machinery convexity mainly has roll caused by the original convexity of roll, roll-force
Bending and elastic flattening, the traversing position of Strip Shape Control mechanism (such as CVC), the set amount at the angle PC and bending roller force given value cause
The factors such as body of roll change in shape, these factors can the variation of bring convexity, wherein roll-force is to influence strip overall length convexity
The principal element of variation, rolls' deformation changes with the variation of roll-force, so that strip profile be made to change.
The principal element of influence of rolled power is exactly temperature, and the variation of temperature can directly result in roll-force and change, thus
It influences strip and exports convexity.And convexity caused by the lateral flow of roller heat convex degree learning, roll wear convexity and strip is physics
Process, in the case that general device condition is constant, these values are remained unchanged in same steel mill process.
The main control means of the Crown control of hot-strip are setting control, and principle is according to finishing stand setup calculation procedure
(FSU) rolling data (roll-force, contact arc length, each rack outlet thickness of each rack etc.) of calculated current strip,
Roll data (the work that PDI data (target width, thickness, target convexity, straightness) and roller management application program provide
Make diameter, convexity, the barrel length etc. of roller and support roller), roll thermal crown computing module calculate each passage strip roll thermal crown, roll
The abrasion convexity data for each passage strip that wearing calculation module provides, the current PC angle transmitted from L1 and roller force value, with one
Series model calculate each rack rolls' deformation and each rack outlet convexity, to calculate the Strip Shape Control mechanism of each rack
Setting value (optimization bending roller force, the angle PC or the traversing position CVC), guarantees that strip reaches target convexity and flatness requirements.
As shown in Fig. 2, widely used PC (Pair Cross intersects roller) the milling train principle in hot rolling production at present
Figure is as shown, PC milling train is to intersect certain angle by roll to control convexity, and roll deviation angle θ is bigger, convexity control
Ability processed is stronger.But another problem is brought simultaneously, because strip can not precise alignment, strip center line and roll centre
Line always has certain deviation, because there is certain angle between PC rolling mill roll axis and horizontal line, when strip misaligns
When, roll deviation angle θ is bigger, and the axial force along strip axis is bigger, and strip running deviation is more serious, and the sideslip of strip will lead to
Two edgings are inconsistent, so as to cause the generation of wedge shape, that is to say, that roll deviation angle θ is bigger, and strip wedge shape is more serious.
There is conflict it can be seen that controlling between convexity and control wedge shape using the angle PC.
The reason is that plate shape setting control traditional under the prior art is all with simple Crown control caused by the above problem
As control target, wedge-shaped quality is never considered, for PC milling train, the angle PC is controlled as preferred control means in setting
In, Controlling principle is just to try to control convexity using the angle PC, uses bending roller force less as far as possible, the consequence of this control strategy is frequent
There is convexity exceeded situation up to standard and wedge-shaped.
To solve the above-mentioned problems, as follows presently, there are having several hot-continuous-rolling strip steels wedge shape, convexity untied simulated techniques:
1) apply on 07 20th, 2010 patent of invention " the hot rolled in series type of disclosed Patent No. 201010230419.8
The convexity of milling train and/or wedge-shaped autocontrol method and system ", the invention be related to a kind of hot rolled in series type rolling machine convexity and/
Or wedge-shaped autocontrol method and system (ASCC), by being established in hot rolled in series type rolling machine from first to last platform finishing rolling mill
Working roller bending and roll gap leveling feedback control, realize full-automatic band convexity (wedge shape) and control, that is, rolling
In the process, ASCC model detect strip wedge shape after, relatively obtain deviation with target wedge shape, using system synthesis operation and
Control means are rectified a deviation, and staged method of adjustment is established, to make the response of feedback control maximize, to correct strip wedge shape
And convexity, guarantee the good straightness of product, prevents serpentine locomotion of the strip in each rack, eliminate existing Crown control means
Single drawback, the overall balance relationship of convexity and straightness.
The patent can carry out comprehensively control to wedge shape and convexity, but this is a kind of feedback control, only when band steel toe
Portion reaches mm finishing mill unit outlet detection instrument and just starts to act, and strip steel head is not in control range, and Crown control executes
Mechanism is bending roller force, when deviation is larger, merely using bending roller force since capacity of equipment limits, and the precision not reached requirement.It is right
The control of wedge shape is leveled by rack two sides screw-down to carry out, likewise, can also encounter and hold when wedge shape is bigger
Row institutional capacity restricted problem, and can not control effectively to strip steel head.
2) patent of invention " the strip wedge shape automatic control side based on heredity that number of patent application is 201510275691.0
Method ", which obtains strip by the detector test in milling train exit and surveys shim values, and strip is surveyed shim values and wedge
Shape value threshold value is compared to obtain wedge-shaped deviation；Then several racks are chosen as wedge shape control rack and set each wedge shape control
The efficiency factor of rack processed, then by wedge-shaped deviation combination strip wedge shape control rack when speed and efficiency factor calculate
To the unilateral adjustment amount of roll gap of the rack.The wedge shape for controlling each rack the present invention is based on second flow balance principle equal proportion is adjusted
Amount, can quickly and effectively control hot-rolled finished product wedge shape.
The invention is equally a kind of wedge-shaped feedback control, and regulating mechanism is still finishing rolling mill unilateral side roll gap, only introduces
Wedge-shaped coefficient of heredity ensure that each rack wedge shape regulated quantity distribution in upstream is more reasonable, but still without solving band steel toe
The wedge-shaped control problem in portion, and convexity cannot be jointly controlled.
3) patent of invention " hot-strip roughing mills camber and the automatic control of wedge shape of Patent No. CN201010266910
Method processed ", invention is mainly by by the practical calculated value and rack two of the actual value of live roughing mill two sides roll-force, roll gap
Spring parameter of side etc. is as input, after accurately calculating, eventually by adjust that milling train is unilateral or two sides roll gap size with
Realize the correction to camber and wedge shape.
The wedge shape that this kind of scheme is exported just for roughing mill is adjusted, and hot-rolled finished product also needs to carry out finishing rolling mill company
It rolls, if mm finishing mill unit strip running deviation or two sides pressure are inconsistent, finished product still may be wedge-shaped bad after the completion of rolling, to convex
Degree cannot be controlled simultaneously.
The above method mainly improves convexity and wedge shape control precision by feedback control, but due to for feeding back control
The measuring instrumentss of system are located at behind finish rolling outlet rack, there are biggish time lag, can only be used to strip middle and back convexity and
Wedge shape.And when convexity and larger wedge-shaped deviation, it is limited to the ability of executing agency, being completely dependent on feedback control cannot reach
It is required that convexity and wedge-shaped precision target.And the above patent is all directed to conventional mill, does not consider the characteristic of PC milling train, that is,
Influence of the angle PC to wedge shape.
In conclusion setting traditional under the prior art is controlled just for convexity precision, and in plate shape setting control
It does not account for leading to the undesirable factor of wedge shape, and recently as user to hot-strip wedge shape increasingly higher demands, therefore
It also has to take into account wedge-shaped quality in setting control.
Summary of the invention
In order to solve the problems, such as that current hot continuous rolling PC milling train plate shape setting control exists, the present invention provides a kind of raising heat
The setting control method of continuous-rolling strip steel overall length convexity and wedge-shaped precision, the present invention and the prior art are the difference is that sufficiently examine
Consider PC milling train feature, just considers influence of the angle PC to wedge shape in setting plate shape link, the angle PC and bending roller force have been done and rationally divided
Work passes through the analysis to history rolling data, it is first determined the setting upper limit at the angle PC under wedge-shaped good condition, then using curved
Roller power compensates the surplus of Crown control, and when controlling the present invention overcomes the setting of traditional PC milling train the angle single use PC is as convexity
The defect of main control means, the control range at the angle reasonable distribution PC and bending roller force make for different cultivars specification limitation maximum
The angle PC reduces the probability that wedge shape occurs, while improving hot-strip product while meeting Crown control required precision
Convexity and wedge-shaped precision, improve the product quality of hot-strip.
A kind of setting control method improving hot-continuous-rolling strip steel overall length convexity and wedge-shaped precision, including continuous hot-rolling mill and its machine
Frame, the specific steps of which are as follows:
1) statistics convexity and the history of the good strip of wedge shape first sets data:
Good strip profile and the target value of being defined as of the convexity is in ± 20 μm of deviations, qualification rate 100%；
The good strip wedge shape that is defined as of wedge shape is in ± 15 μm of deviations, qualification rate 100%；
2) setting value at the angle F2, F3, F4 these three racks PC of continuous hot-rolling mill is counted after step 1) again, ratio is highest
The good angle PC of convexity wedge shape is written as the angle the PC upper limit set later, and by the angle the PC upper limit counted in the angle PC of strip
In upper data table.
3) before strip arrival finish rolling when temperature measurer, starting finish rolling plate shape is presetting, and plate shape is presetting by roller first
Power is fixed as the median of bending roller force control range value, then calculated by mathematical model can reach target convexity F2, F3,
The setting value at the angle PC of these three racks of F4, then check the angle PC setting value whether be more than in step 2) come out should
The upper limit at the good angle PC of rack convexity wedge shape；
Step purpose is herein, traditional PC milling train plate shape setting, in selection two kinds of Crown controls in the angle PC and bending roller force
When mechanism, strip profile is preferentially typically controlled using the angle PC, the upper limit at the angle PC is generally set to the upper limit of machine capability, curved
Roller power is generally set in the median of control range value range, but when the angle PC setting value is more than certain value, due to lateral force
Effect, strip is easy sideslip, generates wedge shape, causes wedge shape bad.So if to meet simultaneously convexity and wedge shape it is good
Condition, it is necessary to the use scope at the angle PC is defined, rationally controls convexity using the ability of a part of roller.
4) if the setting value at the angle PC of these three racks of F2, F3, F4 is not above counting in step 2) in step 3)
The upper limit at the good angle PC of the rack convexity wedge shape come, at this point, target can be reached by a series of calculating of mathematical models
The calculated value at the angle PC of F2, F3, F4 of convexity is output to control system as final setting value, and by the angle PC and each rack bending roller force
Unite L1；
5) if the setting value at the angle PC of these three racks of F2, F3, F4 has been more than counting in step 2) in step 3)
The upper limit at the good angle PC of the rack convexity wedge shape come, then using the upper limit at the angle PC of F2, F3, F4 rack as current PC
Then the setting value at angle recalculates the setting value of bending roller force, the final calculated angle PC and bending roller force are exactly final setting
Value, sends control system L1 to；
Step 4) and step 5) are designed for the continuous hot-rolling mill of conventional equipment PC milling train is calculated in plate shape setting
When, generally using the angle PC as primary control means, bending roller force only makes up Crown control energy when the angle PC reaches the mechanical equipment limit
The deficiency of power, when setting, only consider whether convexity up to standard, and this setting means, due to first pass through in advance statistical analysis determined it is convex
The upper limit at the angle PC when degree and good wedge shape, the angle PC setting value does not exceed this upper limit, when Crown control scarce capacity
Standby bending roller force controls convexity, the reasonable distribution angle PC and bending roller force to Crown control range, wanted meeting Crown control
While asking, wedge-shaped quality has been taken into account to greatest extent.
A kind of setting control method improving hot-continuous-rolling strip steel overall length convexity and wedge-shaped precision according to the present invention, feature
It is, calculates the angle PC that can reach F2, F3, F4 of target convexity by a series of mathematical models in the step 4)
Calculated value as final setting value, the specific steps of which are as follows:
2a) for the hot finisher equipped with PC milling train, there are two types of the control mechanisms that control convexity, the angle PC and curved
Roller power, and it is impossible for solving two control amounts in the angle PC and bending roller force, it is necessary to a control amount is fixed, by another control amount
It is calculated as main control amount.When setting first time, fixed bending roller force is selected, PC when reaching target convexity is solved
Angle, at this time the control range at the angle PC be the angle PC maximum machine allow control range, generally 0~1.5 °, bending roller force at this time
Fixed value selection control domain intermediate value, it may be assumed that
In formula:
I: shelf number；
Fb(i): i-th calculates the calculated value of bending roller force；
Fbmin(i): i-th calculates the minimum value of bending roller force；
Fbmax(i): i-th calculates the maximum value of bending roller force；
After fixed bending roller force, the PC angle setting value θ (i) for meeting current convexity target is obtained；
2b) after the completion of step 2a), it is stored in advance according to the currently steel grade of rolled strip, width grade, the reading of thickness grade
The upper limit value and step 2a that can meet the angle PC that convexity and wedge shape require simultaneously in tables of data) setting of the calculated angle PC
Value θ (i) is compared, if there is any one rack PC angle calculated value is greater than while meeting the angle PC that convexity and wedge shape require
The angle the PC setting value of the rack is set to the upper limit value, is fixed up by upper limit value.If the angle PC is not above this upper limit,
Keep initial value constant, specific judgment mode is as follows:
If θ (i) >=θmax(i), then θ (i)=θmax(i)；
If θ (i) < θmax(i), then θ (i)=θ (i)；
In formula:
θ (i): the i-th angle rack PC calculated value；
θmax(i): the i-th rack meets the upper limit value at the angle PC that convexity and wedge shape require simultaneously, unites from the previous angle the PC upper limit
It is read in meter analytical table；
It 2c) after the angle PC obtained in step 2b) is fixed, carries out second and sets, allow maximum most in bending roller force machinery
A small range solves the bending roller force setting value F for meeting convexity target call under the setting of current PC angleb(i), second of setup algorithm
After the completion, each rack bending roller force setting value F solvedb(i) and PC angle setting value θ (i) is as final setting value.
A kind of setting control method improving hot-continuous-rolling strip steel overall length convexity and wedge-shaped precision according to the present invention, feature
It is, the history setting data of statistics convexity and the good strip of wedge shape in the step 1) and step 2) are used to obtain
The angle PC upper limit when convexity and good wedge shape, wherein since the setting of each angle description strip PC differs greatly it may first have to
Classify to data, principle of classification is to carry out category filter to data by the steel grade of strip, width grade and thickness grade, is screened excellent
Basis of the elegant sample as statistical analysis, the sample be statistically analyze whether reasonable basis, it is necessary to while meeting convexity and wedge
The good condition of shape, screening principle is that the good definition of convexity is strip profile and target value in ± 20 μm of deviations, qualified
Rate is 100%, and the good definition of wedge shape is strip wedge shape in ± 15 μm of deviations, and qualification rate 100%, two meet simultaneously
Strip be included in outstanding sample statistical data analysis library.
A kind of setting control method improving hot-continuous-rolling strip steel overall length convexity and wedge-shaped precision according to the present invention, feature
It is, described two strips met simultaneously are included in outstanding sample statistical data analysis library, specifically, to outstanding sample
The distribution at the angle PC is analyzed, the upper limit value for selecting the angle PC of accumulative ratio 90% to set as the angle PC, while will be counted
The angle each rack PC sets upper limit value by steel grade, width grade, the thickness grade deposit angle PC upper limit table, uses in case of setting later.
It is obtained using the setting control method of a kind of raising hot-continuous-rolling strip steel overall length convexity and wedge-shaped precision of the invention
It is following the utility model has the advantages that
1. the setting control method of a kind of raising hot-continuous-rolling strip steel overall length convexity of the invention and wedge-shaped precision, solves mesh
The control of preceding hot continuous rolling PC milling train plate shape setting there are the problem of, overcome traditional plate shape setting control only using the angle PC as mainly controlling
The shortcomings that mechanism, control convexity with bending roller force when Crown control scarce capacity, the angle reasonable distribution PC and bending roller force
Control range；
2. the setting control method of a kind of raising hot-continuous-rolling strip steel overall length convexity of the invention and wedge-shaped precision, for difference
Prevent to reduce the probability that wedge shape occurs while meeting Crown control precision at the maximum angle PC used of description limitation
Stop strip due to the lateral force larger deviation phenomenon for causing strip the to occur when angle PC is bigger, can effectively improve convexity and wedge
Shape controls precision, improves the quality of hot-strip product.
Detailed description of the invention
Fig. 1 is that convexity and wedge shape define schematic diagram；
Fig. 2 is PC milling train schematic diagram；
Fig. 3 is a kind of calculating of the setting control method of raising hot-continuous-rolling strip steel overall length convexity and wedge-shaped precision of the invention
Flow chart；
Fig. 4 is a kind of PC of the setting control method of raising hot-continuous-rolling strip steel overall length convexity and wedge-shaped precision of the invention
The upper limit value statistical chart at angle.
Specific embodiment
With reference to the accompanying drawings and examples to a kind of raising hot-continuous-rolling strip steel overall length convexity and wedge-shaped precision of the invention
Setting control method is further described.
A kind of setting control method improving hot-continuous-rolling strip steel overall length convexity and wedge-shaped precision, including continuous hot-rolling mill and its machine
Frame, the specific steps of which are as follows:
1) statistics convexity and the history of the good strip of wedge shape first sets data:
Good strip profile and the target value of being defined as of the convexity is in ± 20 μm of deviations, qualification rate 100%；
The good strip wedge shape that is defined as of wedge shape is in ± 15 μm of deviations, qualification rate 100%；
2) setting value at the angle F2, F3, F4 these three racks PC of continuous hot-rolling mill is counted after step 1) again, ratio is highest
The good angle PC of convexity wedge shape is written as the angle the PC upper limit set later, and by the angle the PC upper limit counted in the angle PC of strip
In upper data table.
3) before strip arrival finish rolling when temperature measurer, starting finish rolling plate shape is presetting, and plate shape is presetting by roller first
Power is fixed as the median of bending roller force control range value, then calculated by mathematical model can reach target convexity F2, F3,
The setting value at the angle PC of these three racks of F4, then check the angle PC setting value whether be more than in step 2) come out should
The upper limit at the good angle PC of rack convexity wedge shape；
4) if the setting value at the angle PC of these three racks of F2, F3, F4 is not above counting in step 2) in step 3)
The upper limit at the good angle PC of the rack convexity wedge shape come, at this point, target can be reached by a series of calculating of mathematical models
The calculated value at the angle PC of F2, F3, F4 of convexity is output to control system as final setting value, and by the angle PC and each rack bending roller force
Unite L1；
5) if the setting value at the angle PC of these three racks of F2, F3, F4 has been more than counting in step 2) in step 3)
The upper limit at the good angle PC of the rack convexity wedge shape come, then using the upper limit at the angle PC of F2, F3, F4 rack as current PC
Then the setting value at angle recalculates the setting value of bending roller force, the final calculated angle PC and bending roller force are exactly final setting
Value, sends control system L1 to；
The PC that can reach F2, F3, F4 of target convexity is calculated by a series of mathematical models in the step 4)
The calculated value at angle as final setting value, the specific steps of which are as follows:
2a) for the hot finisher equipped with PC milling train, there are two types of the control mechanisms that control convexity, the angle PC and curved
Roller power, and it is impossible for solving two control amounts in the angle PC and bending roller force, it is necessary to a control amount is fixed, by another control amount
It is calculated as main control amount.When setting first time, fixed bending roller force is selected, PC when reaching target convexity is solved
Angle, at this time the control range at the angle PC be the angle PC maximum machine allow control range, generally 0~1.5 °, bending roller force at this time
Fixed value selection control domain intermediate value, it may be assumed that
In formula:
I: shelf number；
Fb(i): i-th calculates the calculated value of bending roller force；
Fbmin(i): i-th calculates the minimum value of bending roller force；
Fbmax(i): i-th calculates the maximum value of bending roller force；
After fixed bending roller force, the PC angle setting value θ (i) for meeting current convexity target is obtained；
2b) after the completion of step 2a), it is stored in advance according to the currently steel grade of rolled strip, width grade, the reading of thickness grade
The upper limit value and step 2a that can meet the angle PC that convexity and wedge shape require simultaneously in tables of data) setting of the calculated angle PC
Value θ (i) is compared, if there is any one rack PC angle calculated value is greater than while meeting the angle PC that convexity and wedge shape require
The angle the PC setting value of the rack is set to the upper limit value, is fixed up by upper limit value.If the angle PC is not above this upper limit,
Keep initial value constant, specific judgment mode is as follows:
If θ (i) >=θmax(i), then θ (i)=θmax(i)；
If θ (i) < θmax(i), then θ (i)=θ (i)；
In formula:
θ (i): the i-th angle rack PC calculated value；
θmax(i): the i-th rack meets the upper limit value at the angle PC that convexity and wedge shape require simultaneously, unites from the previous angle the PC upper limit
It is read in meter analytical table；
It 2c) after the angle PC obtained in step 2b) is fixed, carries out second and sets, allow maximum most in bending roller force machinery
A small range solves the bending roller force setting value F for meeting convexity target call under the setting of current PC angleb(i), second of setup algorithm
After the completion, each rack bending roller force setting value F solvedb(i) and PC angle setting value θ (i) is as final setting value.
Above procedure is as shown in Figure 3.
The history setting data of statistics convexity and the good strip of wedge shape in the step 1) and step 2) are used to
Obtain the angle PC upper limit when convexity and good wedge shape, wherein since the setting of each angle description strip PC differs greatly, first
It must classify to data, principle of classification is to carry out category filter, sieve to data by the steel grade of strip, width grade and thickness grade
Select outstanding sample as the basis of statistical analysis, the sample be statistically analyze whether reasonable basis, it is necessary to while meeting convexity
With the good condition of wedge shape, screening principle is that the good definition of convexity is strip profile and target value in ± 20 μm of deviations,
Qualification rate is 100%, and the good definition of wedge shape is strip wedge shape in ± 15 μm of deviations, and qualification rate 100%, two full simultaneously
The strip of foot is included in outstanding sample statistical data analysis library.
The strip that described two meet simultaneously is included in outstanding sample statistical data analysis library, specifically, to outstanding
The distribution at the angle sample PC is analyzed, the upper limit value for selecting the angle PC of accumulative ratio 90% to set as the angle PC, while will statistics
The angle each rack PC setting upper limit value out is made as in steel grade, width grade, the thickness grade deposit angle PC upper limit table in case of setting later
With.
Embodiment
The setting control method of a kind of raising hot-continuous-rolling strip steel overall length convexity and wedge-shaped precision of the invention is applied to
In the plate shape setting control of 1580 continuous hot-rolling mills, the unit equipment configuration such as the following table 1:
| F1 | F2 | F3 | F4 | F5 | F6 | F7 | |
| Type | Normal four-roller | PC milling train | PC milling train | PC milling train | Normal four-roller | Normal four-roller | Normal four-roller |
| Bending roller force control range (kN) | 0~1200 | 0~1200 | 0~1200 | 0~1200 | 0~1200 | 0~1200 | 0~1200 |
| PC control range (°) | -- | 0-1.5 | 0-1.5 | 0-1.5 | -- | -- | -- |
Table 1- unit equipment allocation list
Specification, the slab specification of rolled band steel:
Thickness Hs=230mm width Ws=1250mm, hot-strip trimmed size finish rolling exit thickness he=2.61mm, essence
Roll exit width we=1220mm, Co=30 μm of target convexity.
Specification F2, F3, F4 rack meets upper limit value statistical result such as Fig. 4 institute of convexity and the good angle PC of wedge shape
Show.
It can be seen that according to the statistical analysis of Fig. 4 when ratio is 90%, the angle the PC upper limit counted is respectively as follows:
| F2 | F3 | F4 |
| 0.85 | 0.7 | 0.5 |
Fixed bending roller force, the angle PC is as follows as the result of the first time of the first convexity regulating measure setting:
As can be seen from the above results, the angle PC of F2 and F3 has all been more than the upper limit, so the angle PC of fixed F2 and F3, into
Second of setting of row, as a result as follows:
| F1 | F2 | F3 | F4 | F5 | F6 | F7 | |
| Bending roller force (kN) | 1100 | 775 | 985 | 600 | 800 | 747 | 560 |
| The angle PC (°) | -- | 0.85 | 0.7 | 0.43 | -- | -- | -- |
As can be seen from the above results, behind the angle PC of fixed F2 and F3, the bending roller force setting of F2 and F3 are changed.
In order to assess the validity of the present embodiment, a kind of raising hot-continuous-rolling strip steel overall length convexity of the invention and wedge have been counted
Double qualification rate datas of former and later two months same specification strip steels of investment of the setting control method of shape precision, calculation formula are as follows:
The definition of double qualification rates refers to strip while meeting convexity and target value the length qualification rate in ± 20 μm of deviations
It is 100%, the good definition of wedge shape is that strip wedge shape length qualification rate in ± 15 μm of deviations is 100%.Convexity and wedge shape are same
Shi Hege thinks this block strip pairing lattice.After present invention investment, convexity and wedge shape while strip ratio up to standard are improved
15%, to convexity especially wedge shape control precision improvement highly significant.
The setting control method of a kind of raising hot-continuous-rolling strip steel overall length convexity and wedge-shaped precision of the invention, solves at present
The control of hot continuous rolling PC milling train plate shape setting there are the problem of, overcome the control of traditional plate shape setting only using the angle PC as main control machine
The shortcomings that structure, controls convexity, the control at the angle reasonable distribution PC and bending roller force when Crown control scarce capacity with bending roller force
Range processed；The angle PC that the present invention is used for different cultivars specification limitation maximum, thus while meeting Crown control precision,
Reduce the probability that wedge shape occurs, it is therefore prevented that strip due to when the angle PC is bigger the larger sideslip for causing strip to occur of lateral force it is existing
As can effectively improve convexity and wedge shape control precision, improving the quality of hot-strip product.
Claims (4)
1. a kind of setting control method for improving hot-continuous-rolling strip steel overall length convexity and wedge-shaped precision, including continuous hot-rolling mill and its machine
Frame, the specific steps of which are as follows:
1) statistics convexity and the history of the good strip of wedge shape first sets data:
Good strip profile and the target value of being defined as of the convexity is in ± 20 μm of deviations, qualification rate 100%；
The good strip wedge shape that is defined as of wedge shape is in ± 15 μm of deviations, qualification rate 100%；
2) setting value for counting the angle F2, F3, F4 these three racks PC of continuous hot-rolling mill after step 1) again, by the highest strip of ratio
The angle PC as the angle the PC upper limit set later, and by the angle the PC upper limit counted be written the good angle the PC upper limit of convexity wedge shape
In tables of data.
3) before strip arrival finish rolling when temperature measurer, starting finish rolling plate shape is presetting, and plate shape is presetting first consolidates bending roller force
Be set to the median of bending roller force control range value, then calculated by mathematical model can reach target convexity F2, F3, F4 this three
Then the setting value at the angle PC of a rack checks whether the setting value at the angle PC is more than that rack come out in step 2) is convex
The upper limit at the good angle PC of degree wedge shape；
4) if the setting value at the angle PC of these three racks of F2, F3, F4 is not above coming out in step 2) in step 3)
The upper limit at the good angle PC of the rack convexity wedge shape, at this point, target convexity can be reached by a series of calculating of mathematical models
The calculated value at the angle PC of F2, F3, F4 be output to control system as final setting value, and by the angle PC and each rack bending roller force
L1；
5) if the setting value at the angle PC of these three racks of F2, F3, F4 has been more than coming out in step 2) in step 3)
The upper limit at the good angle PC of the rack convexity wedge shape, then using the upper limit at the angle PC of F2, F3, F4 rack as current PC angle
Then setting value recalculates the setting value of bending roller force, the final calculated angle PC and bending roller force are exactly final setting value, passes
Give control system L1.
2. a kind of setting control method for improving hot-continuous-rolling strip steel overall length convexity and wedge-shaped precision as described in claim 1,
It is characterized in that, calculates the PC that can reach F2, F3, F4 of target convexity by a series of mathematical models in the step 4)
The calculated value at angle as final setting value, the specific steps of which are as follows:
2a) for being equipped with for the hot finisher of PC milling train, there are two types of the control mechanisms for controlling convexity, the angle PC and roller
Power, and it is impossible for solving two control amounts in the angle PC and bending roller force, it is necessary to a control amount is fixed, another control amount is made
It is calculated for main control amount.When setting first time, fixed bending roller force is selected, the angle PC when reaching target convexity is solved,
The control range at the angle PC is that the maximum machine at the angle PC allows control range at this time, and generally 0~1.5 °, bending roller force at this time is consolidated
The intermediate value of definite value selection control domain, it may be assumed that
In formula:
I: shelf number；
Fb(i): i-th calculates the calculated value of bending roller force；
Fbmin(i): i-th calculates the minimum value of bending roller force；
Fbmax(i): i-th calculates the maximum value of bending roller force；
After fixed bending roller force, the PC angle setting value θ (i) for meeting current convexity target is obtained；
2b) after the completion of step 2a), data are stored in advance according to the currently steel grade of rolled strip, width grade, the reading of thickness grade
The upper limit value and step 2a that can meet the angle PC that convexity and wedge shape require simultaneously in table) the calculated angle PC setting value θ
(i) it is compared, if there is any one rack PC angle calculated value is greater than while meeting the upper of the angle PC that convexity and wedge shape require
The angle the PC setting value of the rack is set to the upper limit value, is fixed up by limit value.If the angle PC is not above this upper limit, protect
It is constant to hold initial value, specific judgment mode is as follows:
If θ (i) >=θmax(i), then θ (i)=θmax(i)；
If θ (i) < θmax(i), then θ (i)=θ (i)；
In formula:
θ (i): the i-th angle rack PC calculated value；
θmax(i): the i-th rack meets the upper limit value at the angle PC that convexity and wedge shape require simultaneously, from the previous angle PC upper limit counting point
It is read in analysis table；
It 2c) after the angle PC obtained in step 2b) is fixed, carries out second and sets, allow minimax model in bending roller force machinery
In enclosing, the bending roller force setting value F for meeting convexity target call under the setting of current PC angle is solvedb(i), second of setup algorithm is completed
Afterwards, each rack bending roller force setting value F solvedb(i) and PC angle setting value θ (i) is as final setting value.
3. a kind of setting control method for improving hot-continuous-rolling strip steel overall length convexity and wedge-shaped precision as described in claim 1,
It is characterized in that, the history setting data of statistics convexity and the good strip of wedge shape in the step 1) and step 2) are used to
Obtain the angle PC upper limit when convexity and good wedge shape, wherein since the setting of each angle description strip PC differs greatly, first
It must classify to data, principle of classification is to carry out category filter, sieve to data by the steel grade of strip, width grade and thickness grade
Select outstanding sample as the basis of statistical analysis, the sample be statistically analyze whether reasonable basis, it is necessary to while meeting convexity
With the good condition of wedge shape, screening principle is that the good definition of convexity is strip profile and target value in ± 20 μm of deviations,
Qualification rate is 100%, and the good definition of wedge shape is strip wedge shape in ± 15 μm of deviations, and qualification rate 100%, two full simultaneously
The strip of foot is included in outstanding sample statistical data analysis library.
4. a kind of setting control method for improving hot-continuous-rolling strip steel overall length convexity and wedge-shaped precision as claimed in claim 3,
It is characterized in that, described two strips met simultaneously are included in outstanding sample statistical data analysis library, specifically, to outstanding
The distribution at the angle sample PC is analyzed, the upper limit value for selecting the angle PC of accumulative ratio 90% to set as the angle PC, while will statistics
The angle each rack PC setting upper limit value out is made as in steel grade, width grade, the thickness grade deposit angle PC upper limit table in case of setting later
With.
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| CN113070341A (en) * | 2021-03-18 | 2021-07-06 | 鞍钢股份有限公司 | Rolling method for reducing earing rate of hot continuous rolling low-carbon steel sheet |
| CN117732886A (en) * | 2024-02-07 | 2024-03-22 | 东北大学 | Hot rolling quality pre-control method based on cascading intelligent diagnosis |
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