CN104942019A - Automatic control method for width of steel strips during cold rolling - Google Patents

Automatic control method for width of steel strips during cold rolling Download PDF

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Publication number
CN104942019A
CN104942019A CN201410127184.8A CN201410127184A CN104942019A CN 104942019 A CN104942019 A CN 104942019A CN 201410127184 A CN201410127184 A CN 201410127184A CN 104942019 A CN104942019 A CN 104942019A
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width
delta
variable
frame
cold
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CN104942019B (en
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顾廷权
樊志强
刘云峰
严加根
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Baoshan Iron and Steel Co Ltd
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Baoshan Iron and Steel Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B37/00Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/16Control of thickness, width, diameter or other transverse dimensions
    • B21B37/22Lateral spread control; Width control, e.g. by edge rolling

Abstract

The invention relates to an automatic control method for width of steel strips during cold rolling, and belongs to the technical field of automatic control. The method includes: establishing forecasting models for width of exit steel strips for each stand; detecting width measured value at each position in the longitudinal direction of hot-rolled steel strips from an entry of a cold rolling unit in real time; calculating the differences between the measured values and preset values of width of the hot-rolled steel strips, and obtaining width variation of the hot-rolled steel strips to be eliminated by each stand; performing length position tracking on the hot-rolled steel strips from the entry of the cold rolling unit to obtain predicted values of exit width variation of the unit; determining real-time compensation of plate-shaped regulating mechanism of the No. m stand by changing compensation value of the plate-shaped regulating mechanism of a rolling mill of the stand in real time; according to the real time compensation of the plate-shaped regulating mechanism of each stand, performing feedforward control for exit width of each stand, and timely eliminating fluctuation of the width of the hot-rolled steel strips and influence on width of exit steel strips at the last stand by rolling technology parameter variation of each stand to improve width control precision of cold-rolled steel strips and stability of cold-rolling production process.

Description

A kind of cold rolling of strip steel process Automatic control method of width
Technical field
The invention belongs to automatic control technology field, particularly relate to a kind of method automatically controlled for strip width in cold rolling particularly cold continuous rolling process.
Background technology
From board rolling theory and practice, because the metal everywhere with steel in milling train loading roll gap exists in various degree wide to flowing, in cold rolling of strip steel process, width can change.Usually, will roll front and roll difference between rear width and be called width reduction amount.In cold rolling of strip steel process, the change of width mainly due to roll-force and tension force wide to changes in distribution, cause strip width end metal lateral flow direction to change, thus the change of strip width occur.When steel edge portion drafts is relatively bigger than normal, when namely belt plate shape presents limit wave (edge is pine relatively partially), steel edge portion metal easily flows to away from direction, middle part, thus makes strip width increase, reduction reduction; On the contrary, when steel edge portion drafts is relatively less than normal, when namely belt plate shape presents middle wave (edge is relatively tight slightly), steel edge portion metal easily to direction flowing in the middle part of convergence, thus makes that strip width reduces, reduction increases.
Downstream user requirement is met in order to ensure the strip width after cold rolling, the method that current strip width controls usually to adopt is, strip width is not controlled in cold-rolled process, rule of thumb determine cold rolling before incoming band steel width, make to be with steel to be more than or equal to the width of user's requirement through the width after cold rolling, in following process, again cutting edge process is carried out, to ensure that strip width is within the claimed range of user to band steel both sides.
The subject matter that this mode exists: if rolling technological parameter is selected unreasonable in the operation of rolling, make width reduction amount in cold rolling of strip steel process (steel edge portion is tight slightly) bigger than normal, on the one hand easily cause cold-rolled process strip edge brisement band, easily cause on the other hand and roll rear strip width and be less than user and require thus cause waste product.In addition, cutting edge process is carried out to band steel, can lumber recovery be reduced, increase production cost.Therefore, in cold-rolled process, strip width is controlled automatically, for raising cold rolling of strip steel stability of the production process and lumber recovery, reduction production cost significant.
Japan Patent JP2005059053A proposes a kind of method improving cold-strip steel width control system precision after continuous annealing: first, set up with tandem mills outlet strip width be function, the functional relation that is independent variable with tandem mills entrance incoming band steel width, each frame roll-force, profile regulation mechanism controls amount, interstand tension, set up the functional relation in width variation and annealing process between percentage elongation after the continuous annealing of band steel simultaneously.Secondly, steel percentage elongation predicted value is with to substitute into above functional relation by tandem mills strip steel at entry width detection value and each frame prediction of rolling force value, interstand tension predicted value, annealing process, calculate and determine the setting value of tandem mills each frame plate shape governor motion controlled quentity controlled variable except last frame, consistent with desired value with strip width predicted value after making continuous annealing.This technical scheme does not provide the countermeasure of inhibiting band steel through each frame rolling width fluctuations, likely causes operation of rolling broken belt when reality is implemented.
Japan Patent JP2004141885A proposes a kind of cold continuous rolling continuous annealing furnace Unit erriger strip width control method: according to difference, continuous annealing furnace heat-treat condition, relation between continuous annealing furnace strip steel at entry plate shape and continuous annealing furnace inlet port strip width deflection between cold continuous rolling end frame strip steel at entry Thickness sensitivity value and setting value, by controlling the control that cold continuous rolling end rack outlet belt plate shape realizes strip width.The countermeasure that may cause this rack outlet deformed steel strip how is avoided when this technical scheme is not given in last mill stand control strip width.
Japan Patent JP20030001311A proposes strip width control method in a kind of tandem mills mill speed change procedure: set up and change with last rack outlet strip width variable quantity and mill speed the functional relation between each frame roll-force variable quantity, interstand tension variable quantity and profile regulation mechanism controls amount variable quantity caused.Above functional relation is substituted into by according to mill speed and each frame roll-force variable quantity calculated with roll-force relational expression, interstand tension variable quantity, calculate the compensation value determining each frame plate shape governor motion of tandem mills, to make last rack outlet strip width predicted value consistent with desired value.The control objectives of the method mainly eliminates the width variation of last frame outlet of cold-rolling mill band steel, does not have to consider that elimination incoming hot rolled slab change width and upstream stand change width are on the impact of afer bay strip width in time.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of cold rolling of strip steel process Automatic control method of width, it is by setting up each rack outlet strip width forecasting model, variable quantity between input cold-rolling mill entrance incoming hot rolled slab band steel actual measurement width and setting width, the roll-force of each frame, tension force, bending roller force, roll mandrel is to the variable quantity between roll shifting amount measured value and setting value, forecast each rack outlet width deformation amount, be zero for target to make each rack outlet width variation, the compensation rate determining each frame plate shape governor motion is calculated by model, and then reach raising cold rolling of strip steel stability of the production process and lumber recovery, reduce the object of production cost.
Technical scheme of the present invention is: provide a kind of cold rolling of strip steel process Automatic control method of width, be included in cold-rolled process and automatically detecting strip width, it is characterized in that:
A, with the roll-force of cold mill complex entrance incoming hot rolled slab band steel variable quantity, each frame, tension force, bending roller force, roll mandrel to roll shifting amount variable quantity for independent variable, with each rack outlet strip width variable quantity for function, set up each rack outlet strip width forecasting model;
B, at tandem mills entrance configure band steel Width detecting instrument, detect in real time the width measured value of position on cold mill complex entrance incoming hot rolled slab strip length direction;
C, calculate difference between incoming hot rolled slab width measured value and setting value, and it is assigned to each frame according to a certain percentage, obtain the incoming band steel width variation needing each frame to eliminate;
D, extension position tracking is carried out to cold mill complex entrance incoming hot rolled slab band steel, when incoming hot rolled slab a certain position band steel enters a certain frame, by this position incoming band steel variable quantity, and this machine frame rolling mill rolling technological parameter variable quantity, namely roll-force, tension force, bending roller force, roll mandrel are to the variable quantity between roll shifting amount measured value and setting value, input this rack outlet strip width forecasting model, obtain the exit width variable quantity predicted value of this frame;
E, by changing in real time m machine frame rolling mill profile regulation mechanism offset, this rack outlet strip width variable quantity predicted value is made to be 0, to make this rack outlet width variation be zero for target, calculate and determine this frame plate shape governor motion bending roller force, the roll mandrel real-Time Compensation amount to roll shifting amount;
F, by implementing above-mentioned real-Time Compensation amount to each frame plate shape executing agency, eliminating in time incoming hot rolled slab width fluctuations and the impact of each frame rolling technological parameter change on last rack outlet strip width, improving cold-strip steel width control system precision further;
G, by carrying out feedforward control to each rack outlet width, to reduce the incidence of the abnormal conditions such as section, sideslip, improve the stability of cold continuous rolling production process.
Concrete, in described step A, each rack outlet strip width forecasting model adopts following expression formula:
Δ W m = Δ W 0 + Σ i = 1 m ( K WiPi Δ P i + K WiT 0 i Δ T 0 i + K WiT 1 i Δ T 1 i ) + Σ i = 1 m ( K WiFwi Δ F wi + K WiFmi Δ F mi + K WiIMRi Δ IMR i )
In above-mentioned expression formula,
ΔW 0=W 0_act-W 0_set
ΔP i=P i_act-P i_set
ΔT 0i=T 0i_act-T 0i_set
ΔT 1i=T 1i_act-T 1i_set
ΔF wi=F wi_act-F wi_set
ΔF mi=F mi_act-F mi_set
ΔIMR i=IMR i_act-IMR i_set
Wherein, Δ P i, Δ T 0i, Δ T 1i, Δ F wi, Δ F mi, Δ IMR i-be respectively the i-th machine frame rolling mill draught pressure variable quantity, entrance tension variation amount, outlet tension variation amount, work roll bending power variable quantity, intermediate calender rolls bending roller force variable quantity, intermediate roll shifting amount variable quantity;
Δ W 0-incoming hot rolled slab width variation;
Δ W m-the m machine frame rolling mill outlet strip width variable quantity predicted value Δ W m;
W 0_act-incoming hot rolled slab width measured value;
P i_act, T 0i_act, T 1i_act, F wi_act, F mi_act, IMR i_act-be the i-th machine frame rolling mill roll-force measured value, entrance tension force measured value, outlet tension force measured value, work roll bending power measured value, intermediate calender rolls bending roller force measured value, intermediate roll shifting amount measured value respectively;
P i_set, T 0i_set, T 1i_set, F wi_set, F mi_set, IMR i_set-be the i-th machine frame rolling mill rolling force setup value, entrance tension force setting value, outlet tension force setting value, work roll bending power setting value, intermediate calender rolls bending roller force setting value, intermediate roll shifting amount setting value respectively;
K wiPi, K wiT0i, K wiT1i, K wiFwi, K wiFmi, K wiIMRi-be that the i-th machine frame rolling mill roll-force, entrance tension force, outlet tension force, work roll bending power, intermediate calender rolls bending roller force, intermediate roll shifting amount are to the influence coefficient of the i-th machine frame rolling mill outlet strip width respectively.
Concrete, in described step C, by incoming hot rolled slab width variation Δ W 0according to certain ratio, be assigned to each frame, shared by each frame and eliminate the impact of incoming hot rolled slab change width on outlet strip width, it distributes according to carrying out according to following expression formula:
α m Δ W 0 + Σ i = 1 m ( K WiPi Δ P i + K WiT 0 i Δ T 0 i + K WiT 1 i Δ T 1 i ) + Σ i = 1 m ( K WiFwi Δ F wi + K WiFmi Δ F mi + K WiIMRi Δ IMR i ) + ( K WmFwm δ F wm + K WmFmm δ F mm + K WmIMRm δ IMR m ) = 0 Σ j = 1 n α j = 1.0 0 ≤ α j ≤ 1.0 , j = 1,2 , . . . , n
In above-mentioned expression formula,
δ F wm, δ F mm, δ IMR m-be respectively m machine frame rolling mill profile regulation institution staff roll bending power, intermediate calender rolls bending roller force, intermediate roll shifting amount offset;
α j, α mbe respectively incoming hot rolled slab width variation Δ W 0jth frame, m frame allocation proportion coefficient, n is tandem mills frame sum;
K wmFwm, K wmFmm, K wmIMRm-be that m machine frame rolling mill m work roll bending power, intermediate calender rolls bending roller force, intermediate roll shifting amount are to the influence coefficient of m machine frame rolling mill outlet strip width respectively.
Concrete, in described E step, according to the response speed of each profile regulation mechanism of milling train, difference outlet strip width being affected to efficiency, give each profile regulation mechanism offset preferred number separately, then certain frame plate shape governor motion bending roller force, roll mandrel are undertaken to the real-Time Compensation amount of roll shifting amount by following expression formula:
W ′ m = α m ΔW 0 + Σ i = 1 m ( K WiPi ΔP i + K WiT 0 i Δ T 0 i + K WiT 1 i ΔT 1 i ) + Σ i = 1 m ( K WiFwi Δ F wi + K WiFmi Δ F mi + K WiIMRi Δ IMR i ) δF wm = - β Fwm W ′ m / K WmFwm δF mm = - β Fmm W ′ m / K WmFmm δIMR m = - β IMRm W ′ m / K WmIMRm β Fwm + β Fmm + β IMRm = 1.0 0 ≤ β Fwm ≤ 1.0,0 ≤ β Fmm ≤ 1.0,0 ≤ β IMRm ≤ 1.0
In above-mentioned expression formula,
W' m-by m mill stand control eliminate strip width variable quantity;
β fwm, β fmm, β iMRm-be respectively m frame plate shape governor motion work roll bending power, intermediate calender rolls bending roller force, intermediate roll shifting amount offset preferred number.
Autocontrol method described in the technical program, is calculating m machine frame rolling mill outlet strip width variable quantity predicted value Δ W ibasis on, by changing m machine frame rolling mill profile regulation mechanism offset in real time, this rack outlet strip width variable quantity predicted value is made to be 0, namely can eliminate incoming hot rolled slab width fluctuations and the impact of each frame rolling technological parameter change on last rack outlet strip width in time, improve the stability of cold continuous rolling production process.
Further, parameter j, after setting up each rack outlet strip width forecasting model, is put 1 by the autocontrol method described in the technical program, then reads j place, Width detecting instrument current length position incoming band steel width measured value W 0(j); Parameter i is put 1, judges whether j position band steel arrives the i-th machine frame rolling mill entrance, as no, then return and survey again, in this way, then i frame rolling technological parameter and each profile regulation mechanism measured value before reading; According to described j place, rack outlet strip width forecasting model computational length position supplied materials width variation, the i-th frame rolling technological parameter variable quantity and Ban Xing executing agency variable quantity; Calculate the i-th frame plate shape executing agency compensation rate again; Export the i-th frame plate shape executing agency compensation rate; By implementing above-mentioned real-Time Compensation amount to each frame plate shape executing agency, eliminating incoming hot rolled slab width fluctuations and the impact of each frame rolling technological parameter change on last rack outlet strip width in time, improving cold-strip steel width control system precision further.
Autocontrol method described in the technical program is applicable to each cold rolled sheet multi-frame tandem mills and single stand cold mill unit, is conducive to improving strip width control accuracy and rolling process stability.
Compared with the prior art, advantage of the present invention is:
1. adopt the autocontrol method described in the technical program, incoming hot rolled slab width fluctuations and the impact of each frame rolling technological parameter change on last rack outlet strip width can be eliminated in time, cold-strip steel width control system precision can be improved further;
2. by carrying out feedforward control to each rack outlet width, the incidence of the abnormal conditions such as section, sideslip can be reduced, improving the stability of cold continuous rolling production process.
Accompanying drawing explanation
Fig. 1 is width automatic control function block diagram of the present invention;
Fig. 2 is glacing flatness feedforward control general flow chart of the present invention;
Fig. 3 is the 5th rack outlet strip width separate-blas estimation curve when not dropping into Automatic control method of width;
Fig. 4 is the 5th rack outlet strip width separate-blas estimation curve when dropping into Automatic control method of width.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention will be further described.
In Fig. 1, the technical program is at tandem mills entrance configure band steel Width detecting instrument, the width measured value of position on real-time detection cold mill complex entrance incoming hot rolled slab strip length direction, calculate the difference between incoming hot rolled slab width measured value and setting value, and it is assigned to each frame according to a certain percentage, obtain the incoming band steel width variation needing each frame to eliminate.
In Fig. 2, parameter j, after setting up each rack outlet strip width forecasting model, is put 1 by the technical program, then reads j place, Width detecting instrument current length position incoming band steel width measured value W 0(j); Parameter i is put 1, judges whether j position band steel arrives the i-th machine frame rolling mill entrance, as no, then return and survey again, in this way, then i frame rolling technological parameter and each profile regulation mechanism measured value before reading; According to described j place, rack outlet strip width forecasting model computational length position supplied materials width variation, the i-th frame rolling technological parameter variable quantity and Ban Xing executing agency variable quantity; Calculate the i-th frame plate shape executing agency compensation rate again; Export the i-th frame plate shape executing agency compensation rate; By implementing above-mentioned real-Time Compensation amount to each frame plate shape executing agency, eliminating incoming hot rolled slab width fluctuations and the impact of each frame rolling technological parameter change on last rack outlet strip width in time, improving cold-strip steel width control system precision further.
Technical scheme of the present invention provides a kind of tandem mills strip width autocontrol method, it is by setting up each rack outlet strip width forecasting model, variable quantity between input cold-rolling mill entrance incoming hot rolled slab band steel actual measurement width and setting width, the roll-force of each frame, tension force, bending roller force, roll mandrel are to the variable quantity between roll shifting amount measured value and setting value, forecast each rack outlet width deformation amount, to make each rack outlet width variation be zero for target, calculated the compensation rate determining each frame plate shape governor motion by model.
To achieve these goals, present invention employs following technical scheme:
(1) based on cold rolling of strip steel rolling therory and production practices, with the roll-force of cold mill complex entrance incoming hot rolled slab band steel variable quantity, each frame, tension force, bending roller force, roll mandrel to roll shifting amount variable quantity for independent variable, with each rack outlet strip width variable quantity for function, set up each rack outlet strip width forecasting model.
(2) at tandem mills entrance configure band steel Width detecting instrument, as shown in Figure 1, the width measured value of position on real-time detection cold mill complex entrance incoming hot rolled slab strip length direction, calculate the difference between incoming hot rolled slab width measured value and setting value, and it is assigned to each frame according to a certain percentage, obtain the incoming band steel width variation needing each frame to eliminate.
(3) extension position tracking is carried out to cold mill complex entrance incoming hot rolled slab band steel, when incoming hot rolled slab a certain position band steel enters a certain frame, by this position incoming band steel variable quantity, and this machine frame rolling mill rolling technological parameter variable quantity, i.e. roll-force, tension force, bending roller force, roll mandrel is to the variable quantity between roll shifting amount measured value and setting value, input this rack outlet strip width forecasting model, obtain this rack outlet width variation predicted value, with make this rack outlet width variation be zero for target calculate determine this frame plate shape governor motion bending roller force, roll mandrel is to the real-Time Compensation amount of roll shifting amount.
By implementing said method, on the one hand, incoming hot rolled slab width fluctuations and the impact of each frame rolling technological parameter change on last rack outlet strip width can be eliminated in time, cold-strip steel width control system precision can be improved further; On the other hand, feedforward control is carried out to each rack outlet width, the incidence of the abnormal conditions such as section, sideslip can be reduced, improve the stability of cold continuous rolling production process.
Below introduce the concrete Implementation Technology of the present invention and implementation step:
From cold rolled sheet rolling deformation theory, milling train outlet strip width W is the function of rolling technological parameter, entrance supplied materials condition and milling equipment parameter etc.Here emphasis considers the i-th machine frame rolling mill rolling technological parameter draught pressure P i, entrance tension force T 0i, outlet tension force T 1i, the i-th machine frame rolling mill profile regulation institution staff roll bending power F wi, intermediate calender rolls bending roller force F miwith intermediate roll shifting amount IMR i, incoming hot rolled slab width W 0strip width W is exported Deng with m machine frame rolling mill mbetween relation, set up milling train outlet strip width forecasting model as shown in (1) formula:
Δ W m = Δ W 0 + Σ i = 1 m ( K WiPi Δ P i + K WiT 0 i Δ T 0 i + K WiT 1 i Δ T 1 i ) + Σ i = 1 m ( K WiFwi Δ F wi + K WiFmi Δ F mi + K WiIMRi Δ IMR i ) - - - ( 1 )
In formula (1),
W m-the m machine frame rolling mill outlet strip width;
P i, T 0i, T 1i-be respectively the i-th machine frame rolling mill rolling technological parameter draught pressure, entrance tension force, outlet tension force; I-th machine frame rolling mill work roll bending power F wi, intermediate calender rolls bending roller force F miwith intermediate roll shifting amount IMR i;
W 0-incoming hot rolled slab strip width;
K wiPi, K wiT0i, K wiT1i, K wiFwi, K wiFmi, K wiIMRi-be that the i-th machine frame rolling mill roll-force, entrance tension force, outlet tension force, work roll bending power, intermediate calender rolls bending roller force, intermediate roll shifting amount are to the influence coefficient of the i-th machine frame rolling mill outlet strip width respectively;
A i-be other impact outlet strip width constant except Ban Xing executing agency, different along with the difference of the band thickness of steel, mechanical performance and mill data etc., band steel can be divided into groups by steel grade, specification, be solved by theoretical model or experimental technique acquisition.
Due in the operation of rolling of a coil of strip, the thickness of incoming hot rolled slab band steel, mechanical strength and mill data such as dimension of roller, original roll forming etc. remain unchanged substantially, can ignore a in formula (1) ion the impact of exit width.On the basis of formula (1), the i-th machine frame rolling mill rolling technological parameter draught pressure variation delta P can be obtained i, entrance tension variation amount Δ T 0i, outlet tension variation amount Δ T 1i, the i-th machine frame rolling mill profile regulation institution staff roll bending power variation delta F wi, intermediate calender rolls bending roller force variation delta F miwith intermediate roll shifting amount variation delta IMR i, incoming hot rolled slab width variation Δ W 0strip width variable quantity predicted value Δ W is exported Deng with m machine frame rolling mill mbetween the forecasting model of relation as shown in (2) formula:
Δ W m = Δ W 0 + Σ i = 1 m ( K WiPi Δ P i + K WiT 0 i Δ T 0 i + K WiT 1 i Δ T 1 i ) + Σ i = 1 m ( K WiFwi Δ F wi + K WiFmi Δ F mi + K WiIMRi Δ IMR i ) - - - ( 2 )
In formula (2),
ΔW 0=W 0_act-W 0_set
ΔP i=P i_act-P i_set
ΔT 0i=T 0i_act-T 0i_set
ΔT 1i=T 1i_act-T 1i_set
ΔF wi=F wi_act-F wi_set
ΔF mi=F mi_act-F mi_set
ΔIMR i=IMR i_act-IMR i_set
Wherein,
Δ P i, Δ T 0i, Δ T 1i, Δ F wi, Δ F mi, Δ IMR i-be respectively the i-th machine frame rolling mill draught pressure variable quantity, entrance tension variation amount, outlet tension variation amount, work roll bending power variable quantity, intermediate calender rolls bending roller force variable quantity, intermediate roll shifting amount variable quantity;
Δ W 0-incoming hot rolled slab width variation;
Δ W m-the m machine frame rolling mill outlet strip width variable quantity predicted value Δ W m;
W 0_act-incoming hot rolled slab width measured value;
P i_act, T 0i_act, T 1i_act, F wi_act, F mi_act, IMR i_act-be the i-th machine frame rolling mill roll-force measured value, entrance tension force measured value, outlet tension force measured value, work roll bending power measured value, intermediate calender rolls bending roller force measured value, intermediate roll shifting amount measured value respectively;
P i_set, T 0i_set, T 1i_set, F wi_set, F mi_set, IMR i_set-be the i-th machine frame rolling mill rolling force setup value, entrance tension force setting value, outlet tension force setting value, work roll bending power setting value, intermediate calender rolls bending roller force setting value, intermediate roll shifting amount setting value respectively;
K wiPi, K wiT0i, K wiT1i, K wiFwi, K wiFmi, K wiIMRi-be that the i-th machine frame rolling mill roll-force, entrance tension force, outlet tension force, work roll bending power, intermediate calender rolls bending roller force, intermediate roll shifting amount are to the influence coefficient of the i-th machine frame rolling mill outlet strip width respectively.
M machine frame rolling mill outlet strip width variable quantity predicted value Δ W is calculated utilizing formula (2) ibasis on, by changing m machine frame rolling mill profile regulation mechanism offset in real time, this rack outlet strip width variable quantity predicted value is made to be 0, namely can eliminate incoming hot rolled slab width fluctuations and the impact of each frame rolling technological parameter change on last rack outlet strip width in time, improve the stability of cold continuous rolling production process.
Based on this basic controlling thinking, the basis of formula (2) is set up strip width automatic control model as shown in (3) formula:
ΔW 0 + Σ i = 1 m ( K WiPi ΔP i + K WiT 0 i ΔT 0 i + K WiT 1 i ΔT 1 i ) + Σ i = 1 m ( K WiFwi ΔF wi + K WiFmi ΔF mi + K WiIMRi ΔIMR i ) + ( K WiFwi δF wi + K WiFmi δF mi + K WiIMRi δIMR i ) = 0 - - - ( 3 )
In formula (3),
δ F wm, δ F mm, δ IMR m-be respectively m machine frame rolling mill profile regulation institution staff roll bending power, intermediate calender rolls bending roller force, intermediate roll shifting amount offset;
All the other symbol physical significances are identical with formula (2).
When incoming hot rolled slab change width is larger, if eliminate it to the impact exporting strip width by some frames completely, then likely can cause this rack outlet plate shape acute variation, not utilize and keep the operation of rolling to stablize.Based on this, by incoming hot rolled slab width variation Δ W 0according to certain ratio, be assigned to each frame, shared by each frame and eliminate the impact of incoming hot rolled slab change width on outlet strip width, set up strip width automatic control model as shown in (4) formula:
α m Δ W 0 + Σ i = 1 m ( K WiPi Δ P i + K WiT 0 i Δ T 0 i + K WiT 1 i Δ T 1 i ) + Σ i = 1 m ( K WiFwi Δ F wi + K WiFmi Δ F mi + K WiIMRi Δ IMR i ) + ( K WmFwm δ F wm + K WmFmm δ F mm + K WmIMRm δ IMR m ) = 0 Σ j = 1 n α j = 1.0 0 ≤ α j ≤ 1.0 , j = 1,2 , . . . , n - - - ( 4 )
In formula (4),
α j, α mbe respectively incoming hot rolled slab width variation Δ W 0jth frame, m frame allocation proportion coefficient, n is tandem mills frame sum;
K wmFwm, K wmFmm, K wmIMRm-be that m machine frame rolling mill m work roll bending power, intermediate calender rolls bending roller force, intermediate roll shifting amount are to the influence coefficient of m machine frame rolling mill outlet strip width respectively;
All the other symbol physical significances are identical with formula (3).
Meet the δ F of formula (4) wm, δ F mm, δ IMR minfinite multiple combination is had to separate.According to the response speed of each profile regulation mechanism of milling train, difference outlet strip width being affected to efficiency, give each profile regulation mechanism offset preferred number separately, on the basis of formula (4), further foundation strip width automatic control model as the formula (5), thus namely can determine each profile regulation mechanism offset according to formula (5) calculating:
W ′ m = α m ΔW 0 + Σ i = 1 m ( K WiPi ΔP i + K WiT 0 i Δ T 0 i + K WiT 1 i ΔT 1 i ) + Σ i = 1 m ( K WiFwi Δ F wi + K WiFmi Δ F mi + K WiIMRi Δ IMR i ) δF wm = - β Fwm W ′ m / K WmFwm δF mm = - β Fmm W ′ m / K WmFmm δIMR m = - β IMRm W ′ m / K WmIMRm β Fwm + β Fmm + β IMRm = 1.0 0 ≤ β Fwm ≤ 1.0,0 ≤ β Fmm ≤ 1.0,0 ≤ β IMRm ≤ 1.0 - - - ( 5 )
In formula (5),
W' m-by m mill stand control eliminate strip width variable quantity;
β fwm, β fmm, β iMRm-be respectively m frame plate shape governor motion work roll bending power, intermediate calender rolls bending roller force, intermediate roll shifting amount offset preferred number;
All the other symbol physical significances are identical with formula (4).
Be all six-high cluster mill for each frame above, establish strip width automatic control model.For other type rolling mill, similar strip width automatic control model can be set up after the same method.
The effect of above-mentioned cold-strip steel Automatic control method of width is described below by concrete result of implementation:
The inventive method has been applied to certain 1420mm five frame six roller tandem mills, has installed a set of strip width detector at this unit the 1st machine frame rolling mill entrance.
For steel grade uncoated tinplate base, inlet thickness 2.5mm, width 1050mm, exit thickness 0.24mm.For this coiled strip steel, when not dropping into Automatic control method of width, the 5th rack outlet strip width separate-blas estimation curve as shown in Figure 3, strip width control accuracy ± about 2.0mm.
After dropping into Automatic control method of width of the present invention, the 5th rack outlet strip width separate-blas estimation curve as shown in Figure 4, and strip width control accuracy reaches ± about 1.0mm.
Comparison diagram 3, Fig. 4 can find out, after dropping into Automatic control method of width of the present invention, width control system precision significantly improves, and can meet production requirement completely.
Because the present invention is by setting up each rack outlet strip width forecasting model, variable quantity between input cold-rolling mill entrance incoming hot rolled slab band steel actual measurement width and setting width, the roll-force of each frame, tension force, bending roller force, roll mandrel is to the variable quantity between roll shifting amount measured value and setting value, forecast each rack outlet width deformation amount, be zero for target to make each rack outlet width variation, the compensation rate determining each frame plate shape governor motion is calculated by model, and then reach raising cold rolling of strip steel stability of the production process and lumber recovery, reduce the object of production cost.It can be eliminated incoming hot rolled slab width fluctuations and the impact of each frame rolling technological parameter change on last rack outlet strip width in time, can improve cold-strip steel width control system precision further on the one hand; On the other hand, feedforward control is carried out to each rack outlet width, the incidence of the abnormal conditions such as section, sideslip can be reduced, improve the stability of cold continuous rolling production process.
The present invention can be widely used in the width automation field of each cold rolled sheet multi-frame tandem mills and single stand cold mill unit cold-rolled process.

Claims (7)

1. a cold rolling of strip steel process Automatic control method of width, is included in cold-rolled process and is automatically detecting strip width, it is characterized in that:
A, with the roll-force of cold mill complex entrance incoming hot rolled slab band steel variable quantity, each frame, tension force, bending roller force, roll mandrel to roll shifting amount variable quantity for independent variable, with each rack outlet strip width variable quantity for function, set up each rack outlet strip width forecasting model;
B, at tandem mills entrance configure band steel Width detecting instrument, detect in real time the width measured value of position on cold mill complex entrance incoming hot rolled slab strip length direction;
C, calculate difference between incoming hot rolled slab width measured value and setting value, and it is assigned to each frame according to a certain percentage, obtain the incoming band steel width variation needing each frame to eliminate;
D, extension position tracking is carried out to cold mill complex entrance incoming hot rolled slab band steel, when incoming hot rolled slab a certain position band steel enters a certain frame, by this position incoming band steel variable quantity, and this machine frame rolling mill rolling technological parameter variable quantity, namely roll-force, tension force, bending roller force, roll mandrel are to the variable quantity between roll shifting amount measured value and setting value, input this rack outlet strip width forecasting model, obtain the exit width variable quantity predicted value of this frame;
E, by changing in real time m machine frame rolling mill profile regulation mechanism offset, this rack outlet strip width variable quantity predicted value is made to be 0, to make this rack outlet width variation be zero for target, calculate and determine this frame plate shape governor motion bending roller force, the roll mandrel real-Time Compensation amount to roll shifting amount;
F, by implementing above-mentioned real-Time Compensation amount to each frame plate shape executing agency, eliminating in time incoming hot rolled slab width fluctuations and the impact of each frame rolling technological parameter change on last rack outlet strip width, improving cold-strip steel width control system precision further;
G, by carrying out feedforward control to each rack outlet width, to reduce the incidence of the abnormal conditions such as section, sideslip, improve the stability of cold continuous rolling production process.
2. according to cold rolling of strip steel process Automatic control method of width according to claim 1, it is characterized in that in described step A, each rack outlet strip width forecasting model adopts following expression formula:
Δ W m = Δ W 0 + Σ i = 1 m ( K WiPi Δ P i + K WiT 0 i Δ T 0 i + K WiT 1 i Δ T 1 i ) + Σ i = 1 m ( K WiFwi Δ F wi + K WiFmi Δ F mi + K WiIMRi Δ IMR i )
In above-mentioned expression formula,
ΔW 0=W 0_act-W 0_set
ΔP i=P i_act-P i_set
ΔT 0i=T 0i_act-T 0i_set
ΔT 1i=T 1i_act-T 1i_set
ΔF wi=F wi_act-F wi_set
ΔF mi=F mi_act-F mi_set
ΔIMR i=IMR i_act-IMR i_set
Wherein, Δ P i, Δ T 0i, Δ T 1i, Δ F wi, Δ F mi, Δ IMR i-be respectively the i-th machine frame rolling mill draught pressure variable quantity, entrance tension variation amount, outlet tension variation amount, work roll bending power variable quantity, intermediate calender rolls bending roller force variable quantity, intermediate roll shifting amount variable quantity;
Δ W 0-incoming hot rolled slab width variation;
Δ W m-the m machine frame rolling mill outlet strip width variable quantity predicted value Δ W m;
W 0_act-incoming hot rolled slab width measured value;
P i_act, T 0i_act, T 1i_act, F wi_act, F mi_act, IMR i_act-be the i-th machine frame rolling mill roll-force measured value, entrance tension force measured value, outlet tension force measured value, work roll bending power measured value, intermediate calender rolls bending roller force measured value, intermediate roll shifting amount measured value respectively;
P i_set, T 0i_set, T 1i_set, F wi_set, F mi_set, IMR i_set-be the i-th machine frame rolling mill rolling force setup value, entrance tension force setting value, outlet tension force setting value, work roll bending power setting value, intermediate calender rolls bending roller force setting value, intermediate roll shifting amount setting value respectively;
K wiPi, K wiT0i, K wiT1i, K wiFwi, K wiFmi, K wiIMRi-be that the i-th machine frame rolling mill roll-force, entrance tension force, outlet tension force, work roll bending power, intermediate calender rolls bending roller force, intermediate roll shifting amount are to the influence coefficient of the i-th machine frame rolling mill outlet strip width respectively.
3. according to cold rolling of strip steel process Automatic control method of width according to claim 1, it is characterized in that in described step C, by incoming hot rolled slab width variation Δ W 0according to certain ratio, be assigned to each frame, shared by each frame and eliminate the impact of incoming hot rolled slab change width on outlet strip width, it distributes according to carrying out according to following expression formula:
α m Δ W 0 + Σ i = 1 m ( K WiPi Δ P i + K WiT 0 i Δ T 0 i + K WiT 1 i Δ T 1 i ) + Σ i = 1 m ( K WiFwi Δ F wi + K WiFmi Δ F mi + K WiIMRi Δ IMR i ) + ( K WmFwm δ F wm + K WmFmm δ F mm + K WmIMRm δ IMR m ) = 0 Σ j = 1 n α j = 1.0 0 ≤ α j ≤ 1.0 , j = 1,2 , . . . , n
In above-mentioned expression formula,
δ F wm, δ F mm, δ IMR m-be respectively m machine frame rolling mill profile regulation institution staff roll bending power, intermediate calender rolls bending roller force, intermediate roll shifting amount offset;
α j, α mbe respectively incoming hot rolled slab width variation Δ W 0jth frame, m frame allocation proportion coefficient, n is tandem mills frame sum;
K wmFwm, K wmFmm, K wmIMRm-be that m machine frame rolling mill m work roll bending power, intermediate calender rolls bending roller force, intermediate roll shifting amount are to the influence coefficient of m machine frame rolling mill outlet strip width respectively.
4. according to cold rolling of strip steel process Automatic control method of width according to claim 1, it is characterized in that in described E step, according to the response speed of each profile regulation mechanism of milling train, difference outlet strip width being affected to efficiency, give each profile regulation mechanism offset preferred number separately, then certain frame plate shape governor motion bending roller force, roll mandrel are undertaken to the real-Time Compensation amount of roll shifting amount by following expression formula:
W ′ m = α m ΔW 0 + Σ i = 1 m ( K WiPi ΔP i + K WiT 0 i Δ T 0 i + K WiT 1 i ΔT 1 i ) + Σ i = 1 m ( K WiFwi Δ F wi + K WiFmi Δ F mi + K WiIMRi Δ IMR i ) δF wm = - β Fwm W ′ m / K WmFwm δF mm = - β Fmm W ′ m / K WmFmm δIMR m = - β IMRm W ′ m / K WmIMRm β Fwm + β Fmm + β IMRm = 1.0 0 ≤ β Fwm ≤ 1.0,0 ≤ β Fmm ≤ 1.0,0 ≤ β IMRm ≤ 1.0
In above-mentioned expression formula,
W' m-by m mill stand control eliminate strip width variable quantity;
β fwm, β fmm, β iMRm-be respectively m frame plate shape governor motion work roll bending power, intermediate calender rolls bending roller force, intermediate roll shifting amount offset preferred number.
5., according to cold rolling of strip steel process Automatic control method of width according to claim 1, it is characterized in that described autocontrol method is calculating m machine frame rolling mill outlet strip width variable quantity predicted value Δ W ibasis on, by changing m machine frame rolling mill profile regulation mechanism offset in real time, this rack outlet strip width variable quantity predicted value is made to be 0, namely can eliminate incoming hot rolled slab width fluctuations and the impact of each frame rolling technological parameter change on last rack outlet strip width in time, improve the stability of cold continuous rolling production process.
6. according to cold rolling of strip steel process Automatic control method of width according to claim 1, it is characterized in that described autocontrol method is after setting up each rack outlet strip width forecasting model, parameter j is put 1, then reads j place, Width detecting instrument current length position incoming band steel width measured value W 0(j); Parameter i is put 1, judges whether j position band steel arrives the i-th machine frame rolling mill entrance, as no, then return and survey again, in this way, then i frame rolling technological parameter and each profile regulation mechanism measured value before reading; According to described j place, rack outlet strip width forecasting model computational length position supplied materials width variation, the i-th frame rolling technological parameter variable quantity and Ban Xing executing agency variable quantity; Calculate the i-th frame plate shape executing agency compensation rate again; Export the i-th frame plate shape executing agency compensation rate; By implementing above-mentioned real-Time Compensation amount to each frame plate shape executing agency, eliminating incoming hot rolled slab width fluctuations and the impact of each frame rolling technological parameter change on last rack outlet strip width in time, improving cold-strip steel width control system precision further.
7. according to cold rolling of strip steel process Automatic control method of width according to claim 1, it is characterized in that described autocontrol method is applicable to each cold rolled sheet multi-frame tandem mills and single stand cold mill unit, be conducive to improving strip width control accuracy and rolling process stability.
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