CN103949481B - Take into account the flatness Discrete control method of Hot Rolling Strip stability and quality - Google Patents

Take into account the flatness Discrete control method of Hot Rolling Strip stability and quality Download PDF

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Publication number
CN103949481B
CN103949481B CN201410166103.5A CN201410166103A CN103949481B CN 103949481 B CN103949481 B CN 103949481B CN 201410166103 A CN201410166103 A CN 201410166103A CN 103949481 B CN103949481 B CN 103949481B
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flatness
strip
steel
length
band steel
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CN103949481A (en
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邵健
何安瑞
孙文权
姚驰寰
凌智
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University of Science and Technology Beijing USTB
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University of Science and Technology Beijing USTB
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Abstract

A kind of flatness Discrete control method taking into account Hot Rolling Strip stability and quality of the present invention.Comprise the following steps: <i>a</iGreatT.Gr eaT.GT) hot-strip total length is divided into four sections, every section adopts different smoothness objectives control strategies; <i>b</iGreatT.Gr eaT.GT) according to band steel trim width thickness rate, determine first paragraph length, first paragraph flatness adopts zero target control; <i>c</iGreatT.Gr eaT.GT) finish rolling outlet band steel position is as second segment when steel is stung to coiling machine in first paragraph end, and second segment adopts flatness non-zero to control; <i>d</iGreatT.Gr eaT.GT) using before second segment end to finish rolling during flying shear back-end crop finish rolling outlet band steel position as the 3rd section, the bending roller force at the 3rd section of locking second segment end, implement potential flatness non-zero to control, and roller feedback regulation amount when increasing flatness is bad; <i>e</iGreatT.Gr eaT.GT) using the 3rd section of end to tail part of band steel as the 4th section, the 4th section of flatness adopts zero target control.The flatness bad impact on rolling stability when can solve band steel threading and throw tail, after band steel can be prevented to be cooled to normal temperature, flatness is bad simultaneously.

Description

Take into account the flatness Discrete control method of Hot Rolling Strip stability and quality
technical field:
The present invention relates to a kind of hot-continuous-rolling strip steel Bar Rolling Process, specifically refer to the flatness Discrete control method taking into account Hot Rolling Strip stability and quality.
background technology:
Hot-continuous-rolling strip steel rolling schematic flow sheet as shown in Figure 1, slab is heated to after assigned temperature through heating furnace and comes out of the stove, after de-scaling before roughing, enter roughing mill carry out the reciprocal rolling of multi-pass, after being rolled down to certain thickness, through Coil Box (or stay-warm case) insulation, flying shear crop, high-pressure water descaling, send into multi-frame mm finishing mill unit to be rolled, enter section cooling runout table afterwards and cool, then enter downcoiler rolling.The rolling of hot-strip, particularly Thin Specs Hot Rolling Strip is the cutting edge technology of board rolling always, flatness not still its main quality control index, and flatness is bad easily causes thin gauge strip rolling unstable, serious then cause steel scrap, and then the direct motion that impact is produced.
Flatness control system is as a part for plat control system, at the utilization comparative maturity of hot-continuous-rolling strip steel, mainly be divided into flatness setting control system and flatness feedback control system, before finish rolling outlet not yet detects band steel flatness, bending roller force set by main employing setting control system ensures that band steel flatness reaches desired value, after flatness instrument detects band steel flatness, the deviation of foundation flatness detected value and desired value, real-time adjustment bending roller force size, make band steel total length flatness close to desired value, eliminate the deviation of desired value and measured value, be illustrated in figure 2 flatness feedback control system.Band is after steel enters into coiling machine, and coiling machine and milling train end frame set up tension force, and due to the impact of tension force, the visible shape wave of band steel disappears substantially, and now flatness feedback generally no longer participates in regulating, the frame locking of milling train end batch and to build before bending roller force size.
Above-mentioned flatness control technology mainly realizes in mm finishing mill unit, and object ensures that finish rolling rolls rear band steel shape wave well, but also through section cooling after being with steel to roll, batch, a series of process such as air cooling, due to impacts such as initial transverse temperature inequality, the cold edge inhomogeneous coolings of layer, easily causes bilateral wave after uncoiling, for this reason, compensating rolling rear target, namely in the operation of rolling, shutting out middle wave, by cooling, batching, after air cooling, reach the effect of uncoiling without wave, the method is also widely used at present.
From current looked into document, introduce the algorithm design of flatness control system and more by arranging flatness non-zero target and then improving the report of finished product shape wave, as the application of document 1(continuous hot-rolling mill flatness feedback control system, iron and steel, 2006, Vol.41, No.2) in refer to flatness feedback control system, total length adopts the non-zero-compensation of the flatness of single 0-8IU, ensures final shape wave; Patent 1(hot-rolled strip steel moderate sea profile shape controlling, 02133073.5) the final flatness of unrestrained target control in employing is proposed; Patent 2(diversified cross-connection control method for plate shape of hot rolling band steel, 200810079592.5) propose to adopt the desired value of micro-middle wave to ensure final flatness; Patent 3(medium thin slab continuous casting and rolling plate shape integrated control method, 03111285.4) the bending roller force feedback model based on flatness deviation is described.But the document as first-class numerous open report has been showed no implements Discrete control content to band steel total length flatness.
Adopt flatness non-zero target (as middle wave, micro-middle wave) to compensate roller repairing etc. be feasible on the impact of plate shape, but because the requirement of hot-strip to rolling stability is high, particularly ultra-thin gauge rolling, strip steel head enters milling train and instrument, and afterbody is when leaving milling train, have shape wave then can produce following problem:
1) if Thin Strip Steel enters before milling train shape wave, band steel is beated, the probability of nose or sideslip increases considerably, and easily causes and nips unsuccessfully, cause steel scrap.
2) Thin Strip Steel leaves milling train end frame, if there is middle wave, then head is easily acutely beated on laminar flow roller-way, and head upwarps, cause batching difficulty of nipping, also affect the measurement of instrument to head thickness, width, temperature simultaneously, disturb the normal setup algorithm of other models.
3) if with middle wave when band steel leaves milling train, be then with steel to be easy to sideslip, cause whipping and roll brokenly, the stability that impact is produced.
For this reason, although band steel total length all adopts plate shape compensation policy to some extent solve the impact of roller repairing on plate shape, the risk of rolling stability is brought.
summary of the invention:
Content of the present invention is a kind of flatness Discrete control method taking into account Hot Rolling Strip stability and quality, mainly through carrying out segmentation to hot-strip total length, different segmentations adopts different flatness control strategies, while ensureing strip shape quality, improve thin gauge strip rolling stability end to end, as shown in Figure 3.Its key step is as follows:
A () is divided into 4 sections band steel total length, respectively with head length computational methods, batch sting steel signal, finish rolling flying shear back-end crop signal determines segmentation key point position.
The determination of (b) band steel first paragraph length and flatness control strategy.As shown in Figure 4, if the control length of strip steel head is L 1, when strip steel head leaves finish rolling end frame, at 0-L 1strip length within the scope of, adopt straight mode to control shape wave, namely do not adopt any indemnifying measure, band steel smoothness objectives is zero, reduces shape wave to batching the impact of stinging steel and thickness, width, thermometric instrument and detecting.L 1length determine with band steel flakiness ratio relevant, first paragraph length L 1computing formula as follows:
if ( , then )
Wherein:
L 1: first paragraph strip length, m;
L b: head datum length, relevant with the sense cycle speed of flatness instrument.If instrument sense cycle is less than 100ms, then value can be 25-30m, if instrument sense cycle is greater than 100ms, then value can be 30-45m;
B: band steel finished width, mm;
H: band steel finished product thickness, mm;
L g: finish rolling end frame to the distance of coiling machine, m.
The determination of (c) band steel second segment length and flatness control strategy.Finish rolling outlet strip length is accumulative reaches L 1time, start to enter second segment length, when strip steel head enters coiling machine, coiling machine has steel signal to become ON from OFF, and now band steel in finish rolling exit is the end of second segment length, second segment length L 2computing formula as follows:
Wherein:
L 2: second segment strip length, m.
As shown in Figure 5, in this length, flatness nonzero value size is relevant with the ratio between finished product thickness H with hot-strip finished width B, if 500≤B/H, then flatness non-zero target gets 30IU; If 300≤B/H<500, then flatness non-zero target gets 20IU; If B/H<300, then flatness non-zero target gets 10IU.
The determination of (d) band steel the 3rd segment length and flatness control strategy.From second segment strip length end, when being ON to tail part of band steel flying shear shear signal, now Dai Gang position in finish rolling exit is designated as the 3rd segment length end, the 3rd segment length L 3computing formula as follows:
Wherein:
L 3: the 3rd section strip steel length, m;
V s: last rack outlet strip speed, m/s;
T: time, s;
T 1: coiling machine is nipped the moment, s;
T 2: flying shear back-end crop moment before finish rolling, s.
As shown in Figure 6, in this length, now finish rolling end frame locks the roller force value at the second section strip steel end, implements the non-zero control mode that flatness is potential.If but shape wave is excessive, coiling tension is not enough to flattening strap steel, and flatness instrument detects that visible non-zero flatness deviation appears in the 3rd section strip steel, then the 3rd section strip steel flatness feedback function roller regulated quantity is 3.0 times of the corresponding regulated quantity of second segment.
The determination of (e) band steel the 4th segment length and flatness control strategy.Band steel the 4th section is defined as, the 4th segment length L from the 3rd section of end to tail part of band steel 4computing formula as follows:
Wherein:
L 4: the 4th section strip steel length, m;
T 3: last frame throws the steel moment, s.
As shown in Figure 7, in this length, bending roller force controls by band steel flatness zero target, recalculates bending roller force size according to the payload in this moment and roll state, ensure the stability of throwing steel, what minimizing caused because of middle wave rolling rolls brokenly or whipping.
accompanying drawing illustrates:
Fig. 1 Hot Rolling Strip schematic flow sheet
Fig. 2 hot rolling flatness feedback function block
Fig. 3 hot-strip flatness Discrete control schematic diagram
Fig. 4 hot-strip first paragraph length L 1schematic diagram
Fig. 5 hot-strip second segment length L 2schematic diagram
Fig. 6 hot-strip the 3rd segment length L 3schematic diagram
Fig. 7 hot-strip the 4th segment length L 4schematic diagram
detailed description of the invention:
The detailed description of the invention of flatness Discrete control method is now described for certain iron and steel enterprise 1780mm continuous hot-rolling mill.This continuous hot-rolling mill mm finishing mill unit is 7 frames, and rolling steel grade is Q235B, final finished rolling thickness H=3.75mm, rolling width B=1260mm, and finish rolling end frame is to the distance L of coiling machine g=95m.
(a) band steel first paragraph length L 1 and flatness control strategy
Strip steel head length L 1flatness controls to adopt straight method, by setting each frame bending roller force size, makes the desired value of flatness be 0IU, according to the response characteristic of flatness instrument, gets L b=30m, then L 1length computation as follows:
m
This computational length is less than finish rolling end frame to coiling machine distance L ghalf, so determine that strip steel head length is 42m.
Before strip steel head length arrives flatness instrument, the size of each frame bending roller force adopts the bending roller force setup algorithm value of process control computer.Each frame bending roller force setup algorithm step is as follows:
1) obtain the finishing stand setup result of band steel, the thickness as each frame distributes, draught pressure size, belt steel temperature value etc.
2) according to equal proportion convexity principle between finish rolling end rack outlet target flatness and frame, outlet and the entrance convexity size of each frame of finish rolling is determined.
3) according to the temperature computation roller heat convex degree learning size of working roll and support roller.
4) the wearing and tearing roll forming of evaluation work roller and support roller.
5) according to working roll and support roller wearing and tearing roll forming, thermal forming, the characteristic value of respective comprehensive roll forming is tried to achieve.
6) according to above data, the roller force value of each frame is solved.
If the elasticity ignored after being with steel to roll is recovered, carrying roll gap shape is the profile of outlet band steel, and the carrying Gap crown computation model of each frame can be expressed as:
In above formula, C hand C hbe respectively the entry and exit convexity of band steel in certain frame; h outand H inbe respectively each frame band steel entry and exit thickness; η is convexity coefficient of heredity, and each frame value is different; C mfor mechanical convexity, refer to the load Gap crown not considering that supplied materials convexity utilizes mechanical model to calculate when affecting.C mcalculating adopt inearized model, in model, the influence coefficient of each variable is by Finite Element Method off-line calculation, and then obtain through Multiple Non Linear Regression, the expression formula of bending roller force model is as follows:
In formula, k pfor roll-force influence coefficient; P is rolling force setup value; k ffor bending roller force influence coefficient; B ffor bending roller force setting value; k wCfor roll forming influence coefficient in the middle part of working roll; C wCfor roll forming characteristic value in the middle part of working roll; k wEfor working roll edge roll forming influence coefficient; C wEfor working roll edge roll forming characteristic value; k bCfor roll forming influence coefficient in the middle part of support roller; C bCfor roll forming characteristic value in the middle part of support roller; k bEfor support roller edge roll forming influence coefficient; C bEfor support roller edge roll forming characteristic value; k cWRfor working roll ground conth influence coefficient; C cWRfor working roll ground conth characteristic value; C constfor constant term, between its value with frame convexity allocation strategy and self study relevant.
Adopt as above formula, the bending roller force setting value of each frame can be obtained, as shown in table 1 below.
The size of each frame bending roller force adopts above-mentioned bending roller force setting value, can obtain good flatness, guarantee threading stability before strip steel head length arrives flatness instrument.When flatscope detects signal, then start flatness closed loop feedback and control, according to actual measurement flatness size, bending roller force is adjusted.
Table 1 first paragraph roller setup algorithm pilot process value
F1 F2 F3 F4 F5 F7 F7
H in (mm) 35.02 21.24 13.52 9.29 6.85 5.33 4.36
h out (mm) 21.24 13.52 9.29 6.85 5.33 4.36 3.75
η(-) 0.11 0.15 0.21 0.28 0.37 0.41 0.44
C H (μm) 369 224 143 98 72 56 46
C h (μm) 224 143 98 72 56 46 40
C m(μm) 224.02 143.07 97.93 71.9 55.99 46.13 40.34
P (kN) 22400 22070 17200 15000 11350 10480 9030
k p(μm/kN) 0.0046 0.0041 0.0041 0.0041 0.0059 0.006 0.0058
B f(kN) 652.38 611.44 659.11 695.72 510.37 487.74 657.61
k f(μm/kN) -0.0786 -0.0542 -0.0482 -0.0575 -0.1126 -0.1141 -0.1093
C WC(μm) 65 46 41 12 14 11 9
k WC(-) -0.106 -0.115 -0.115 -0.131 -0.137 -0.133 -0.137
C WE (μm) 168 156 128 85 39 26 12
k WE(-) -0.102 -0.093 -0.091 -0.092 -0.118 -0.12 -0.116
C BC (μm) 0 0 -1 -1 -2 -2 -2
k BC(-) 0.008 0.005 0.003 0.004 0.008 0.008 0.008
C BE (μm) -1 -2 -11 -18 -23 -24 -27
k BE(-) -0.146 -0.103 -0.069 -0.082 -0.123 -0.125 -0.117
C CWR (μm) -271 -235 -187 -112 -100 -100 -125
k CWR(-) -0.447 -0.249 -0.278 -0.302 -0.366 -0.368 -0.361
C const(μm) 75 46.8 22.8 24.5 13.6 3.7 14.2
In flatness control system, use Digital PID Controller, Digital PID Algorithm form is:
In above-mentioned formula:
: the calculated value of a last frame kth control cycle end moment bending roller force correction, kN.When last frame is not empty out-of-date, i=7, otherwise i=6.
E (k): the deviate of a kth control cycle flatness, IU.Flat (k) is this cycle flatness measured value, Flat aimfor smoothness objectives value, then e (k)=Flat aim-Flat (k).
E (k-1): the deviate of (k-1) individual control cycle flatness, IU.It calculates same e (k);
K: control cycle sequence number, k=1,2,
K p: proportionality coefficient, its value is from process control computer;
K i: integral coefficient, its value is from process control computer;
K d: differential coefficient, its value is from process control computer;
K f: bending roller force to flatness influence coefficient, unit IU/kN, its value is from process control computer;
Such as, for this section the 7th sense cycle, actual measurement Flat (7)=15IU, smoothness objectives Flat aim=0, COEFFICIENT K p=0.8, K i=0.1, K d=0.3, K f=0.5517, the integration item in a upper cycle =-173, the flatness deviation e (6)=-18 in a upper cycle, can obtain:
The flatness deviation in this cycle:
Integration item:
Differential term:
Bending roller force correction:
End frame bending roller force size is adjusted to:
Wherein, B ffor last frame bending roller force setting value.
(b) band steel second segment length L 2 flatness control strategy
Band steel second segment length L 2flatness controls to adopt micro-middle unrestrained control method, and because target thickness is 3.0mm, the desired value of setting flatness is 10IU.The pid control algorithm same first stage of flatness feedback.
Such as, for this section the 4th sense cycle, actual measurement Flat (7)=3IU, smoothness objectives Flat aim=10, COEFFICIENT K p=0.8, K i=0.1, K d=0.3, K f=0.5517, the integration item in a upper cycle =19, the flatness deviation e (3)=9 in a upper cycle, can obtain:
The flatness deviation in this cycle:
Integration item:
Differential term:
Bending roller force correction:
End frame bending roller force size is adjusted to:
(c) band steel the 3rd segment length L 3 flatness control strategy
After band steel enters coiling machine, due to the foundation of tension force, visible shape wave disappears, now keep the bending roller force of second segment length, if in the 3rd section of operation of rolling, still have visible shape wave, then continue to carry out closed-loop control according to the method for second stage, but now, adjustment factor is enlarged into original 3.0 times, namely adopts following bending roller force account form:
Such as, for this section the 9th sense cycle, actual measurement Flat (9)=17IU, smoothness objectives Flat aim=10, COEFFICIENT K p=0.8, K i=0.1, K d=0.3, K f=0.5517, the integration item in a upper cycle =-7, the flatness deviation e (8)=-2 in a upper cycle, and the bending roller force size lock value B at second segment end f_LOCK=680kN, can obtain:
The flatness deviation in this cycle:
Integration item:
Differential term:
Bending roller force correction:
End frame bending roller force size is adjusted to:
(d) band steel the 4th segment length L 4flatness control strategy
After flying shear back-end crop completes, according to the bending roller force computational methods of first paragraph, recalculate and now ensure the bending roller force size that plate shape is straight, and carry out setting and issue.But when calculating, because tail temperature and head have difference, roll-force P no longer continues to use head setting value, and takes the roll-force measured value mean value of afterbody; Because thermal expansion of rollers and wearing and tearing cause the change of comprehensive roll forming, roll forming parameter C wC(in the middle part of working roll roll forming characteristic value), C wE(working roll edge roll forming characteristic value), C bC(in the middle part of support roller roll forming characteristic value), C bE(support roller edge roll forming characteristic value) takes the updated value of corresponding computing module.Continue the formula adopting the first stage, the bending roller force setting value of the 4th section of each frame can be obtained, as shown in table 2 below:
Table 2 the 4th section of roller setup algorithm pilot process value
F1 F2 F3 F4 F5 F7 F7
H in (mm) 35.02 21.24 13.52 9.29 6.85 5.33 4.36
h out (mm) 21.24 13.52 9.29 6.85 5.33 4.36 3.75
η(-) 0.11 0.15 0.21 0.28 0.37 0.41 0.44
C H (μm) 369 224 143 98 72 56 46
C h (μm) 224 143 98 72 56 46 40
C m(μm) 224.02 143.07 97.93 71.9 55.99 46.13 40.34
P (kN) 20100 21950 15200 13100 9550 10480 7840
k p(μm/kN) 0.0046 0.0041 0.0041 0.0041 0.0059 0.006 0.0058
B f(kN) 509.73 590.04 475.66 547.93 409.09 482.14 588.58
k f(μm/kN) -0.0786 -0.0542 -0.0482 -0.0575 -0.1126 -0.1141 -0.1093
C WC(μm) 70 51 45 16 18 14 12
k WC(-) -0.106 -0.115 -0.115 -0.131 -0.137 -0.133 -0.137
C WE (μm) 169 157 130 87 41 28 14
k WE(-) -0.102 -0.093 -0.091 -0.092 -0.118 -0.12 -0.116
C BC (μm) 0 0 -1 -1 -2 -2 -2
k BC(-) 0.008 0.005 0.003 0.004 0.008 0.008 0.008
C BE (μm) -1 -2 -11 -18 -23 -24 -27
k BE(-) -0.146 -0.103 -0.069 -0.082 -0.123 -0.125 -0.117
C CWR (μm) -271 -235 -187 -112 -100 -100 -125
k CWR(-) -0.447 -0.249 -0.278 -0.302 -0.366 -0.368 -0.361
C cons(μm) 75 46.8 22.8 24.5 13.6 3.7 14.2
The size of each frame bending roller force adopts above-mentioned bending roller force setting value, can obtain good flatness in tail part of band steel, ensures the stability of throwing steel, reduces and roll brokenly or whipping risk.
(e) implementation result
Investigate from rolling stability and strip shape quality two aspect, evaluate the implementation result of control method of the present invention.Based on the quality objection of Market Feedback, filter out strip shape quality objection data wherein, after control method of the present invention being implemented, the strip shape quality objection tonnage of continuous 6 months every months compares with the mean value implemented first 6 months, that is: quality objection decline=[(implementing front 6 monthly average value-enforcements quality objection rear every month)]/implement front 6 monthly average value × 100%, after control method of the present invention is implemented, in strip shape quality objection half a year, decline average is 16.50%.Use the same method, add up the steel scrap rate because band steel is beated, the plate shape problem such as nose, sideslip or whipping causes, in half a year, decline average is 34.83%.Illustrate that the method for the invention while guarantee strip shape quality, can improve thin gauge strip rolling stability end to end.

Claims (5)

1. take into account a flatness Discrete control method for Hot Rolling Strip stability and quality, it is characterized in that: described method comprises following steps:
A) hot-strip total length is divided into four sections, every section adopts different flatness control objectives;
B) according to the flakiness ratio of band steel finished product, determine the length of the first section strip steel, band steel is before entering each frame of finish rolling, the bending roller force of each frame with flatness zero target for according to calculating, after hot-strip has gone out finish rolling end frame, if actual measurement flatness and zero target have deviation, by flatness feedback function point analysis end frame bending roller force, ensure the flatness null value that the first section strip steel reaches set; Wherein, the length of first paragraph is determined as follows:
if ( , then )
Wherein:
L 1: first paragraph strip length, m;
L b: head datum length, relevant with the sense cycle speed of flatness instrument;
If instrument sense cycle is less than 100ms, then value can be 25-30m, if instrument sense cycle is greater than 100ms, then value can be 30-45m;
B: band steel finished width, mm;
H: band steel finished product thickness, mm;
L g: finish rolling end frame to the distance of coiling machine, m;
When c) steel being stung to coiling machine in first paragraph end, finish rolling outlet band steel position is as second segment length, second segment adopts flatness non-zero control mode, control to adjust last frame bending roller force by flatness feedback function, ensure the flatness nonzero value that the second section strip steel reaches set;
D) using before second segment end to finish rolling during flying shear back-end crop finish rolling outlet band steel position as the 3rd segment length, in the 3rd section strip steel operation of rolling, end frame locks the roller force value at the second section strip steel end, implement potential flatness non-zero control mode, and flatness feedback function end frame roller regulated quantity when increasing the 3rd section strip steel flatness is bad;
E) using the 3rd section of end to band steel total length afterbody as the 4th segment length, the 4th section strip steel flatness adopts zero target control mode, according to flatness zero target and roll and load condition calculated each frame bending roller force at that time.
2. a kind of flatness Discrete control method taking into account Hot Rolling Strip stability and quality according to claim 1, it is characterized in that: in step c), the length of second segment is determined as follows:
Wherein:
L 2: second segment strip length, m.
3. a kind of flatness Discrete control method taking into account Hot Rolling Strip stability and quality according to claim 1, it is characterized in that: in step d), the length of the 3rd section is determined as follows:
Wherein:
L 3: the 3rd section strip steel length, m;
V s: last rack outlet strip speed, m/s;
T: time, s;
T 1: coiling machine is nipped the moment, s;
T 2: flying shear back-end crop moment before finish rolling, s.
4. a kind of flatness Discrete control method taking into account Hot Rolling Strip stability and quality according to claim 1, it is characterized in that: in step e), the length of the 4th section is determined as follows:
Wherein:
L 4: the 4th section strip steel length, m;
T 3: last frame throws the steel moment, s.
5. a kind of flatness Discrete control method taking into account Hot Rolling Strip stability and quality according to claim 1; it is characterized in that: in step d); batch after setting up tension force; visible flatness defect disappears usually; flatness instrument detected value is zero; now finish rolling end frame locks the roller force value at the second section strip steel end, implements the non-zero control mode that flatness is potential;
If but shape wave is excessive, coiling tension is not enough to flattening strap steel, and visible non-zero flatness deviation appears in the 3rd section strip steel, then the 3rd section strip steel flatness feedback function roller regulated quantity is 3.0 times of the corresponding regulated quantity of second segment.
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