CN1333093A - Sheet thickenss control method for continuous rolling mill rolling plan caculation method and sheet thickness controller - Google Patents

Sheet thickenss control method for continuous rolling mill rolling plan caculation method and sheet thickness controller Download PDF

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CN1333093A
CN1333093A CN00134746A CN00134746A CN1333093A CN 1333093 A CN1333093 A CN 1333093A CN 00134746 A CN00134746 A CN 00134746A CN 00134746 A CN00134746 A CN 00134746A CN 1333093 A CN1333093 A CN 1333093A
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regulation
rolling
thickness deviation
thickness
milling train
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CN1240496C (en
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井波治树
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Mitsubishi Electric Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • B21B37/165—Control of thickness, width, diameter or other transverse dimensions responsive mainly to the measured thickness of the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/04—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring thickness, width, diameter or other transverse dimensions of the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/02—Transverse dimensions
    • B21B2261/04—Thickness, gauge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/18—Elongation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/22—Pass schedule

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  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)

Abstract

The invention obtains a method and device for controlling thickness in a continuous rolling mill by which the adjustment of a tuning rate alpha is facilitated by formulizing the effect on tension when changing the tuning rate alpha. This method has an inlet-side thickness deviation detecting state for determining thickness deviation on the inlet side just before a material to be rolled enters a rolling mill, an outlet-side thickness deviation detecting stage for determining the thickness deviation on the outlet side just after the material to be rolled is passed through the rolling mill, a calculating stage of the fluctuation in the forward slip for determining the fluctuation Delta fs in the forward slip of the sheet speed from the inlet-side thickness deviation Delta H and the outlet-side thickness deviation Delta h, and a turning rate adjusting stage for adjusting the tuning rate concerned with the suppression of the tension fluctuation between the rolling mills based on Delta fs, Delta H and Delta h.

Description

The method for controlling thickness of continuous-rolling, rolling scheme computational methods and board thickness control apparatus
The present invention relates in many continuous milling trains, carry out the continuous-rolling of plate rolling, relate in particular to and consider method for controlling thickness, rolling scheme computational methods and the board thickness control apparatus that suppresses the continuous-rolling of tension change between each milling train.
Figure 6 shows that the block diagram of one of most representative thickness meter formula thickness of slab control example in the thickness of slab control mode.Below simple declaration is carried out in the action of this thickness of slab control mode.In Fig. 6, given depressing position S A, in order to control from the depressing position of screwdown gear 1 to milling train 2.At this moment, T PBe the time constant of the expression and the response of screwdown gear 1 speed when approximate, τ represents the time delay of this moment.
Depressing position S according to given milling train 2 AAnd milling train constant M determines rolling load F ABy the rolling load F of rolled piece according to milling train 2 ABe rolled into thickness of slab h+ Δ h with the factor 3 of plastic coefficient Q+ Δ Q.At this moment, the external influence factor of rolling phenomenon has the plasticity changes delta Q that is caused by the inlet thickness of slab deviation delta H and the temperature of rolled piece.The control of thickness meter formula thickness of slab is used for eliminating because of these change Δ H, Δ Q and causes by the change Δ h of rolled piece outlet thickness of slab h+ Δ h.
The following describes the action situation.Such thickness meter formula board thickness control apparatus is to move in short-term at the instantaneous switch 6 that makes that is just being begun by rolled piece after rolling, with base pressure upper/lower positions S AOBe stored in base pressure upper/lower positions storage device 4, with the rolling load F of benchmark AOBe stored in the rolling load storage device 5 of benchmark.Then, according to milling train constant M, regulation α and gain G, calculate depressing position S AWith base pressure upper/lower positions S AODifference delta S A, rolling load F AWith the rolling load F of benchmark AODifference delta F A, and output depressing position correction amount S *, with the depressing position S of control screwdown gear 1 AEliminate by the thickness deviation Δ h of rolled piece.Δ S *Calculate by following formula.
(formula 1) Δ S * = - G { ( S A - S AO ) + α M ( F A - F AO ) } · · · ( 1 )
In theory, it is generally acknowledged, when regulation α=1, gain G=1, reduce to export thickness of slab deviation delta h, can obtain maximum effect.But, if regulation α is near 1, depressing position is strengthened to move, then because the change of the speed of rolls of milling train 2, it is quite chaotic that the mutual tension force of milling train becomes, and can influence safety operation, so the method for in fact taking is, on the basis of observing rolling situation, transfer big regulation α as far as possible.
For example there is Japanese patent of invention to disclose the example of 1992 No. 210805 communique, 1994 No. 71616 communique record of Japanese patent of invention bulletin as the control method of plate rolling, all be when thickness meter formula, absolute thickness are guaranteed that mode and monitor mode are combined into the thick control of andante mutually, improve the computational methods of thickness of slab data transmission period, depressing position by research, in the hope of improving the thickness of slab precision.Above-mentioned example all is not on the basis of considering logical plate (inhibition tension change), and control limit and regulation are controlled.In fact, also must be in the thick control of considering the influence of tension force of basic enterprising andante.
In the method for controlling thickness of aforesaid traditional continuous-rolling, the influence to tension force when regulation α is changed can't be formulated, but on the basis of observing rolling situation, adopts successive approximation method to carry out the adjusting of regulation α.
The present invention carries out in order to solve aforesaid problem, purpose is to obtain the method for controlling thickness and the board thickness control apparatus of such continuous-rolling, it is to be formulated when regulation α is changed the influence of tension force, can be easy to carry out the adjusting of regulation α like this.
The method for controlling thickness of continuous-rolling of the present invention is a kind of thickness meter formula method for controlling thickness of continuous-rolling, has: obtain the inlet thickness deviation detection operation that is about to enter milling train inlet thickness deviation before by rolled piece; Obtain by rolled piece and just detect operation by the outlet thickness deviation of the outlet thickness deviation after the milling train; Obtain the advance coefficient change calculation process of the preceding sliding rate change of plate speed according to inlet thickness deviation and outlet thickness deviation; And, according to preceding sliding rate change, inlet thickness deviation and outlet thickness deviation, the regulation that the relevant regulation of tension change that suppresses between milling train is regulated is regulated operation.
In addition, also has the lower limit calculation process, the optimum value of the regulation when this operation uses inhibition tension force preferential, this tension force suppresses and can derive by the characteristic with the approximate screwdown gear of constant, and by the supposition plastic coefficient, calculating is by the lower limit of the rolling preceding regulation of rolled piece, and regulation is regulated operation and used lower limit, also carries out the adjusting of regulation before rolling by rolled piece.
In addition, the lower limit calculation process calculates the lower limit of many milling train regulations, regulation is regulated operation and is set a reference value that makes the certain regulation of tensioning load, this tensioning load is the tensioning load to many milling trains that depends on given rolling scheme, by on a reference value, adding same factor, obtain the regulation of many milling trains again.
In addition, regulation is regulated operation and is used the plastic coefficient of obtaining according to the rolling load of benchmark that just begins the storage of rolling back, in the operation of rolling regulation is adjusted.
In addition, the computational methods that rolling scheme computational methods of the present invention are rolling schemes of a kind of continuous-rolling have: obtain the inlet thickness deviation detection operation that is about to enter milling train inlet thickness deviation before by rolled piece; Obtain by rolled piece and just detect operation by the outlet thickness deviation of the outlet thickness deviation after the milling train; Obtain the preceding sliding rate change calculation process of the preceding sliding rate change of plate speed from inlet thickness deviation and outlet thickness deviation; And the rolling scheme calculation process that calculates the rolling scheme that satisfies following condition simultaneously, these conditions comprise, according to the optimum value, inlet thickness of slab and the outlet thickness of slab that suppress the regulation when preferential at the tension force that can derive by the characteristic with the approximate screwdown gear of constant, the regulation that makes all milling trains is regularly a condition; And the actual entry thickness deviation of relative 1 milling train, realize that the target of N platform milling train exports the condition that thickness deviation is used.
In addition, the board thickness control apparatus of continuous-rolling of the present invention is a kind of thickness meter formula board thickness control apparatus of continuous-rolling, has: obtain the inlet thickness deviation detection means that is about to enter milling train inlet thickness deviation before by rolled piece; Obtain the outlet thickness deviation detection means of just having been passed through milling train outlet thickness deviation afterwards by rolled piece; Obtain the preceding sliding rate change calculating means of the preceding sliding rate change of plate speed from inlet thickness deviation and outlet thickness deviation; And, according to the change of preceding sliding rate, inlet thickness deviation and outlet thickness deviation, to milling train between tension change suppress the regulation regulating measure that relevant regulation is regulated.
In addition, also have lower limit and calculate means, the optimum value of the regulation when these means use tension force to suppress preferential, this tension force suppresses can derive by the characteristic with the approximate screwdown gear of constant, and by the supposition plastic coefficient, calculate the lower limit of regulation before rolling by rolled piece, the regulation regulating measure is used lower limit, also carries out the adjusting of regulation before rolling by rolled piece.
In addition, lower limit calculating means are calculated the lower limit of many milling train regulations, the regulation regulating measure is set a reference value that makes the certain regulation of tensioning load, this tensioning load is the tensioning load to many milling trains that depends on given rolling scheme, by on a reference value, adding same factor, obtain the regulation of many milling trains again.
In addition, the regulation regulating measure is used the plastic coefficient of obtaining according to the rolling load of benchmark that just begins the storage of rolling back, in the operation of rolling regulation is adjusted.
The simple declaration of accompanying drawing
Figure 1 shows that the tension model schematic diagram between milling train.
Figure 2 shows that the inlet of milling train, the schematic diagram of outlet thickness deviation.
Figure 3 shows that the curve map of the relation of outlet thickness deviation and preceding sliding rate change.
Figure 4 shows that the pie graph of the invention process form 1.
Figure 5 shows that the block diagram after the block diagram distortion of Fig. 6.
Figure 6 shows that the block diagram of one of thickness meter formula thickness of slab control example.
Example 1 now is described.
Fig. 1 is the schematic diagram during with the tension force modeling between the milling train i+1 of the milling train i of symbol 8 and symbol 9.Can think the exit plate speed V of tension force σ between milling train and milling train i i OutAccess panel speed V with milling train i+1 I+1 InBetween difference be integrated into direct ratio.That is:
(formula 2) σ = E L ∫ ( V in i + 1 - V out i ) dt … ( 2 ) The speed of rolls Virol of the milling train of this exit plate speed Viout and back can represent with following relational expression:
(formula 3) V out i = V rol i ( 1 + fs i ) … ( 3 )
At this, fs iBe called preceding sliding rate, represent relative speed of rolls V i RolExit plate speed V i OutIncrement rate.If speed of rolls V i RolBe controlled as necessarily, then according to formula (3), if fs iChange Δ fs iIncrease, then exit plate speed V i OutChange increase, tension force σ changes to chaotic direction.Equally, the exit plate speed V of milling train i+1 I+1 OutAlso can represent with following relational expression.
(formula 4) V out i + 1 = V rol i + 1 ( 1 + fs i + 1 ) … ( 4 )
Also has the access panel speed V of milling train i+1 I+1 InIf with preceding sliding rate fs I+1Represent, according to the mass flow law of conservation, then:
(formula 5) V in i + 1 = V rol i + 1 ( 1 + fs i + 1 ) h i + 1 H i + 1 … ( 5 )
In the formula, H I+1, h I+1Be respectively inlet thickness of slab and the outlet thickness of slab of milling train i+1.If controlling, supposition makes speed of rolls V (+) RolFor necessarily, then according to formula (5), though also depend on H I+1, h I+1Change, but generally speaking, if fs I+1Change Δ fs I+1Increase, then V I+1 mChange increase, tension force σ changes to chaotic direction.
Therefore, obtain the condition that preceding sliding rate change Δ fs is diminished.Preceding sliding rate fs uses the simplest approximate expression, can be expressed as follows according to inlet thickness of slab H and outlet thickness of slab h:
(formula 6) fs = 1 4 H - h H … ( 6 )
If the largest portion deviation of inlet thickness deviation is Δ H, its by milling train after remaining deviation be Δ h (Fig. 2), then before the absolute value of sliding rate change | Δ fs| can represent (preceding sliding rate change calculation process, preceding sliding rate change calculating means) with following formula:
(formula 7) | Δfs | ≈ 1 4 | H + ΔH - ( h + Δh ) H + ΔH - H - h H | = 1 4 | ΔH · h - Δh · H | ( H + ΔH ) H … ( 7 )
Therefore, according to formula (7),
Δ Hh-Δ hH＜0 o'clock, Δ h: little → | Δ fs|: little → tension change: little
Δ Hh-Δ hH＞0 o'clock, Δ h: big → | Δ fs|: little → tension change: little
Figure 3 shows that one of outlet thickness of slab deviation delta h and preceding sliding rate change Δ fs relation example.Utilize this principle to regulate the size of regulation α.
Figure 4 shows that the block diagram of one of regulation α Principles of Regulation among the present invention embodiment.In Fig. 4, symbol 10 is adjusting devices (regulation is regulated operation, regulation regulating measure) of the new regulation α that introduces in the present invention.Symbol 11 for directly measure be about to enter milling train by the measuring mechanism of rolled piece thickness deviation Δ H (the inlet thickness deviation detects operation, inlet thickness deviation detection means), symbol 12 be directly measure just by after the roll by the measuring mechanism of rolled piece thickness deviation Δ h (the outlet thickness deviation detects operation, exports the thickness deviation detection means).
Regulation α adjusting device 10 is calculated following formula according to thickness deviation Δ H, the Δ h of measuring mechanism 11,12 acquisitions and the setting inlet thickness of slab H and the outlet thickness of slab h of rolling scheme:
(formula 8)
K＝ΔH·h－Δh·H …(8)
According to formula (7), when K＜0,
Δ h: little → | Δ fs|: little → tension change: little
So if increase regulation α in order to reduce to export thickness of slab deviation delta h, then tension change Δ σ diminishes, so on regulation α, add adjustment coefficient C＞0.On the other hand, when K＞0,
Δ h: big → | Δ fs|: little → tension change: little
So if reduce regulation α in order to increase outlet thickness of slab deviation delta h, then tension change Δ σ diminishes.This has violated this original purpose of outlet thickness deviation that finally reduces milling train, and α should be big as far as possible.Therefore, from by suppressing the viewpoint that tension change comes safety operation, will be according to the coefficient of tension change Δ σ decision:
f(Δσ)＞0
From regulation α, deduct, with such method decision α.
Utilize above algorithm, just needn't be as conventional, on the basis of the tension change situation in observation is rolling, by successive approximation method decision regulation α, under situation about having, increase regulation α and can suppress tension change Δ σ, detect so rolling situation, in addition, on the basis of the viewpoint that also contains safety operation, can obtain to obtaining the best regulation α of maximum efficiency.
Again, in this example, by rolled piece before being about to enter milling train thickness deviation Δ H and just detected by measuring mechanism 11,12 by rolled piece by the thickness deviation Δ h behind the roll (inlet thickness deviation detection means, outlet thickness deviation detection means), but also can use from the rolling load of force cell 13 or from the physical quantity of depressing position S of screwdown gear 1 etc., indirect calculation thickness deviation Δ H and thickness deviation Δ h.
Example 2 now is described.
Below again by use formula (7), obtain the optimum value of the regulation α when to suppress tension change be preferential theoretically.Fig. 5 is the figure that repaints after the block diagram that the thickness meter formula thickness of slab of Fig. 6 is controlled is out of shape.If will export thickness of slab deviation delta h and depressing position changes delta S ABe formulated, then:
(formula 9)
Δh＝(ΔH－ΔS A)G P＋ΔS A …(9)
(formula 10) Δ S A = H P [ ΔS A - G { ΔS A + αG P ( ΔH - ΔS A ) } ] … ( 10 )
Wherein,
(formula 11) G P = Q M + Q … ( 11 )
(formula 12) H P = e - TS T P s + 1 … ( 12 )
Draw according to formula (10):
(formula 13) ΔS A = - αH P GG P ΔH 1 - H P ( 1 - G + αGG P ) … ( 13 )
So, if with formula (13) substitution formula (9), then:
(formula 14)
Δh＝A(s；α)ΔH …(14)
(formula 15) A ( s , α ) = 1 - H P { 1 - G ( 1 - α ) } 1 - H P { 1 - G ( 1 - αG ) } G P … ( 15 )
If with formula (14) substitution formula (7), then obtain:
(formula 16) | Δfs | = 1 4 ΔH | h - A ( S ; α ) H | ( H + ΔH ) H … ( 16 )
For making tension change Δ σ meet following formula for the optimum value of minimum regulation α
Figure A0013474600104
(formula 17)
Δfs(α)＝0 …(17)
If supposition Hp Hc (constant) asks its value, then acquisition and inlet thickness of slab deviation delta H and outlet thickness of slab deviation delta h have nothing to do Relational expression:
(formula 18) α ~ = ( G p H - h ) ( 1 - H c + H c G ) H c GG p ( H - h ) … ( 18 )
Wherein, Hp represents the response characteristic of screwdown gear 1, when it is approximately constant Hc, if establish: relatively by the maximum deviation Δ H of rolled piece Max, actual maximum output valve Δ S Max AMaximum command value Δ S to board thickness control apparatus output MaxRatio be Hc, then can obtain the reflection rolling mill characteristic
Figure A0013474600107
If supposition plastic coefficient Q before rolling, use formula (18) is asked , then, can grasp regulation α's in order to make tension change Δ σ minimum
Figure A0013474600109
Value, the while can be grasped the lower limit according to the α of the viewpoint of thickness of slab control before rolling
Figure A00134746001010
(lower limit calculation process, lower limit are calculated means).Thus, the situation of K＜0 of example 1 can be avoided, the adjustment time can be shortened.
Example 3 now is described.
In addition, if before rolling, suppose plastic coefficient Q, each milling train i is asked with formula (18)
Figure A00134746001011
, then can know the relative tension change Δ σ relevant, the counterweight balance of its regulation α with the rolling scheme that provides.If with this Be benchmark, the regulation α of each milling train i is added identical coefficient C＞0, with such form:
(formula 19) α i = α ~ i + c … ( 19 )
α adjusts to regulation, just can suppress the deviation of the tension change between each milling train.
Example 4 now is described.
In above-mentioned example 3, use formula (18) is asked each milling train i before rolling The time, must suppose plastic coefficient Q, generally speaking, the relation of plastic coefficient Q and rolling load F can followingly be represented:
(formula 20) Q = F H - h … ( 20 )
If utilize this relational expression, the rolling load F of benchmark of the rolling load storage device of not shown benchmark will be begun just to deposit in after rolling AOSubstitution formula (20) is obtained plastic coefficient Q 0, and use this plastic coefficient Q 0, use formula (18), (19) to regulation α iAdjust, then can more correctly carry out regulation
Figure A0013474600115
Adjustment, to suppress the deviation of the tension change between each milling train.
Example 5 now is described.
Below example 5 of the present invention is described.Can know from formula (18), with respect to the tension change Δ σ relevant, the counterweight balance of its regulation α with the rolling scheme that provides.Because formula (18) is inlet thickness of slab H and the function that exports thickness of slab h, so, utilize it can obtain the load that makes with respect to tension change Δ σ and reach uniform rolling scheme.That is,, then become following formula if formula (18) is replaced as each milling train i:
(formula 21) α ~ i = ( G p h i - 1 - h i ) ( 1 - H c + H c G ) H c GG p ( h i - 1 - h 1 ) … ( 21 )
Obtain following formula from formula (14), (15) again:
(formula 22) Δh i = 1 - H c { 1 - G ( 1 - α i ) } 1 - H c { 1 - G ( 1 - α i G ) } G p Δh i - 1 … ( 22 )
Therefore, reach evenly, establish in order to make load with respect to tension change Δ σ:
(formula 23)
From satisfying the h of formula (21) iSet { h iAmong, select 1 set according to following viewpoint
Figure A0013474600122
Utilize formula (21) from Ask
Figure A0013474600124
, establish:
(formula 24) α i = α ~ i + c … ( 24 )
With α iSubstitution formula (22), when giving uniform load by just obtaining like this thickness of slab control to each milling train, each milling train with respect to the thickness of slab deviation delta h that enters the mouth I-1Outlet thickness of slab deviation delta h iSo, with respect to the inlet thickness of slab deviation delta Hi=Δ h of the reality of milling train 1 0, decision And c, to realize the target outlet thickness of slab deviation delta h of milling train N NIf utilize above rolling scheme establishing method, the rolling scheme that just can obtain to make the counterweight balance with respect to the tension change Δ σ between each milling train to be dispersed.
The method for controlling thickness of continuous-rolling of the present invention is a kind of thickness meter formula method for controlling thickness of continuous-rolling, has: obtain the inlet thickness deviation detection operation that is about to enter milling train inlet thickness deviation before by rolled piece; Obtain by rolled piece and just detect operation by the outlet thickness deviation of the outlet thickness deviation behind the milling train; Obtain the preceding sliding rate change calculation process of the preceding sliding rate change of plate speed from inlet thickness deviation and outlet thickness deviation; And, according to the change of preceding sliding rate, inlet thickness deviation and outlet thickness deviation, to milling train between tension change suppress the regulation that relevant regulation regulates and regulate operation.Therefore, can acquisition obtain the best regulation α that maximum efficiency is used.In addition, when regulation α is changed the influence of tension force is represented with mathematical expression, just can be regulated regulation α easily.
In addition, also has the lower limit calculation process, the optimum value of the regulation when this operation uses tension force to suppress preferential, this tension force suppresses can derive by the characteristic with the approximate screwdown gear of constant, and by the supposition plastic coefficient, calculate the lower limit of regulation before rolling by rolled piece, regulation is regulated operation and is used lower limit, also carries out the adjusting of regulation before rolling by rolled piece.Therefore, the situation of K＜0 can be avoided, the adjustment time can be shortened.
In addition, the lower limit calculation process calculates the lower limit of many milling train regulations, regulation is regulated operation and is set a reference value that makes the certain regulation of tensioning load, this tensioning load is the tensioning load to many milling trains that depends on given rolling scheme, by on a reference value, adding same factor, obtain the regulation of many milling trains again.The deviation that therefore, can suppress the tension change between each milling train.
In addition, regulation is regulated operation and is used the plastic coefficient of obtaining according to the rolling load of benchmark that just begins the storage of rolling back, in the operation of rolling regulation is adjusted.Therefore, can more correctly carry out the adjustment of regulation.
In addition, the computational methods that rolling scheme computational methods of the present invention are rolling schemes of a kind of continuous-rolling have: obtain the inlet thickness deviation detection operation that is about to enter milling train inlet thickness deviation before by rolled piece; Obtain by rolled piece and just detect operation by the outlet thickness deviation of the outlet thickness deviation after the milling train; Obtain the preceding sliding rate change calculation process of the preceding sliding rate change of plate speed from inlet thickness deviation and outlet thickness deviation; And the rolling scheme calculation process that calculates the rolling scheme that satisfies following condition simultaneously, these conditions comprise: the optimum value, inlet thickness of slab and the outlet thickness of slab that suppress (this tension force suppresses can derive by the characteristic with the approximate screwdown gear of the constant) regulation when being preferential according to tension force, the regulation that makes all milling trains is the condition of a timing, and the actual entry thickness deviation of relative 1 milling train, realize that the target of N platform milling train exports the condition that thickness deviation is used.Therefore, the rolling scheme that can obtain to make the counterweight balance with respect to the tension change between each milling train to disperse.
In addition, the board thickness control apparatus of continuous-rolling of the present invention is a kind of thickness meter formula board thickness control apparatus of continuous-rolling, has: obtain the inlet thickness deviation detection means that is about to enter milling train inlet thickness deviation before by rolled piece; Obtain the outlet thickness deviation detection means of just having been passed through milling train outlet thickness deviation afterwards by rolled piece; Obtain the preceding sliding rate change calculating means of the preceding sliding rate change of plate speed from inlet thickness deviation and outlet thickness deviation; And, according to the change of preceding sliding rate, inlet thickness deviation and outlet thickness deviation, to milling train between tension change suppress the regulation regulating measure that relevant regulation is regulated.Therefore, the best regulation α that can acquisition obtains maximum efficiency.In addition, can represent with mathematical expression the influence of tension force when regulation α is changed, just can regulate regulation α easily.
In addition, also have lower limit and calculate means, the optimum value of the regulation when these means use tension force to suppress preferential, this tension force suppresses can derive by the characteristic with the approximate screwdown gear of constant, and by the supposition plastic coefficient, calculate the lower limit of regulation before rolling by rolled piece, the regulation regulating measure is used lower limit, also carries out the adjusting of regulation before rolling by rolled piece.Therefore, the situation of K＜0 can be avoided, the adjustment time can be shortened.
In addition, lower limit calculating means are calculated the lower limit of many milling train regulations, the regulation regulating measure is set a reference value that makes the certain regulation of tensioning load, this tensioning load is the tensioning load to many milling trains that depends on given rolling scheme, by on a reference value, adding same factor, obtain the regulation of many milling trains again.The deviation that therefore, can suppress tension change between each milling train.
In addition, the regulation regulating measure is used the plastic coefficient of obtaining according to the rolling load of benchmark that just begins the storage of rolling back, in the operation of rolling regulation is adjusted.Therefore, can more correctly carry out the adjustment of regulation.

Claims (9)

1. the method for controlling thickness of a continuous-rolling is a kind of thickness meter formula method for controlling thickness of continuous-rolling, it is characterized in that having:
Obtain the inlet thickness deviation detection operation that is about to enter milling train inlet thickness deviation before by rolled piece;
Obtain by rolled piece and just detect operation by the outlet thickness deviation of the outlet thickness deviation after the milling train;
Obtain the preceding sliding rate change calculation process of the preceding sliding rate change of plate speed from described inlet thickness deviation and described outlet thickness deviation;
According to sliding rate change before described, described inlet thickness deviation and outlet thickness deviation, to milling train between tension change suppress the regulation that relevant regulation regulates and regulate operation.
2. the method for controlling thickness of continuous-rolling according to claim 1 is characterized in that,
Also has the lower limit calculation process, the optimum value of the regulation when this operation use tension force inhibition is preferential, this tension force suppresses can derive by the characteristic with the approximate screwdown gear of constant, and passes through to suppose plastic coefficient, before rolling, calculate the lower limit of regulation by rolled piece
Described regulation is regulated operation and is used described lower limit, also carries out the adjusting of regulation before rolling by rolled piece.
3. the method for controlling thickness of continuous-rolling according to claim 2 is characterized in that,
Described lower limit calculation process calculates the lower limit of many milling train regulations,
Described regulation is regulated operation and is set a reference value that makes the certain regulation of tensioning load, this tensioning load is the tensioning load to these many milling trains that depends on given rolling scheme, by on this a reference value, adding same factor, obtain the regulation of these many milling trains again.
4. the method for controlling thickness of continuous-rolling according to claim 3 is characterized in that,
Described regulation is regulated operation and is used the plastic coefficient of obtaining according to the rolling load of benchmark that just begins the storage of rolling back, in the operation of rolling regulation is adjusted.
5. the rolling scheme computational methods of a continuous-rolling is characterized in that having:
Obtain the inlet thickness deviation detection operation that is about to enter milling train inlet thickness deviation before by rolled piece;
Obtain by rolled piece and just detect operation by the outlet thickness deviation of the outlet thickness deviation after the milling train;
Obtain the preceding sliding rate change calculation process of the preceding sliding rate change of plate speed from described inlet thickness deviation and described outlet thickness deviation;
Calculate the rolling scheme calculation process of the rolling scheme that satisfies following condition simultaneously, these conditions comprise: the tension force that can derive according to the characteristic with the approximate screwdown gear of constant suppresses to be set at optimum value, inlet thickness of slab and the outlet thickness of slab of the regulation when preferential, the regulation that makes all milling trains is the condition of a timing, and the actual entry thickness deviation of relative 1 milling train, realize that the target of N platform milling train exports the condition that thickness deviation is used.
6. the board thickness control apparatus of a continuous-rolling is a kind of thickness meter formula board thickness control apparatus of continuous-rolling, it is characterized in that having:
Obtain the inlet thickness deviation detection means that is about to enter milling train inlet thickness deviation before by rolled piece;
Obtain the outlet thickness deviation detection means of just having been passed through milling train outlet thickness deviation afterwards by rolled piece;
Obtain the preceding sliding rate change calculating means of the preceding sliding rate change of plate speed from described inlet thickness deviation and described outlet thickness deviation;
According to sliding rate change, described inlet thickness deviation and described outlet thickness deviation before described, to milling train between tension change suppress the regulation regulating measure that relevant regulation is regulated.
7. the board thickness control apparatus of continuous-rolling according to claim 6, it is characterized in that, also have lower limit and calculate means, the optimum value of the regulation when these means use tension force to suppress preferential, this tension force suppresses can derive by the characteristic with the approximate screwdown gear of constant, and, before rolling, calculate the lower limit of regulation by rolled piece by the supposition plastic coefficient
Described regulation regulating measure is used described lower limit, also carries out the adjusting of regulation before rolling by rolled piece.
8. the board thickness control apparatus of continuous-rolling according to claim 7 is characterized in that,
Described lower limit calculating means are calculated the lower limit of many milling train regulations,
Described regulation regulating measure is set a reference value that makes the certain regulation of tensioning load, this tensioning load is the tensioning load to many milling trains that depends on given rolling scheme, by on this a reference value, adding same factor, obtain the regulation of these many milling trains again.
9. the board thickness control apparatus of continuous-rolling according to claim 8 is characterized in that,
Described regulation regulating measure is used the plastic coefficient of obtaining according to the rolling load of benchmark that just begins the storage of rolling back, in the operation of rolling regulation is adjusted.
CNB001347462A 2000-07-06 2000-12-07 Sheet thickenss control method for continuous rolling mill rolling plan caculation method and sheet thickness controller Expired - Lifetime CN1240496C (en)

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CN1327307C (en) * 2003-10-15 2007-07-18 株式会社日立制作所 Rolling control device and rolling control method
CN101332474B (en) * 2007-06-25 2010-09-08 宝钢新日铁汽车板有限公司 Control method of rolling mill capable of preventing slipping
CN102274863A (en) * 2011-06-07 2011-12-14 中冶赛迪工程技术股份有限公司 Automatic plate thickness control method of single-stand rolling mill with PI parameter limitation
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CN1327307C (en) * 2003-10-15 2007-07-18 株式会社日立制作所 Rolling control device and rolling control method
CN101332474B (en) * 2007-06-25 2010-09-08 宝钢新日铁汽车板有限公司 Control method of rolling mill capable of preventing slipping
CN101959623B (en) * 2008-02-27 2013-07-24 西门子公司 Operating method for a multi-stand rolling mill train with strip thickness determination on the basis of the continuity equation
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WO2014067037A1 (en) * 2012-10-31 2014-05-08 宝山钢铁股份有限公司 Method for producing band steel with different target thicknesses along longitudinal direction using hot continuous rolling mill set
US9796008B2 (en) 2012-10-31 2017-10-24 Baoshan Iron & Steel Co., Ltd. Method for producing band steel with different target thicknesses along longitudinal direction using hot continuous rolling mill set
CN105436209A (en) * 2014-09-28 2016-03-30 宝山钢铁股份有限公司 Unilateral thickness control method of heavy and medium plate mill
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CN106239037A (en) * 2016-07-29 2016-12-21 黄冈三德板业有限公司 The cold rolling hot dip integrated production method of steel plate and steel plate
CN106239037B (en) * 2016-07-29 2019-02-15 黄冈三德板业有限公司 The cold rolling hot dip integrated production method and steel plate of steel plate

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