CN103949481A - Flatness subsection control method considering both rolling stability and quality of hot rolling band steel - Google Patents
Flatness subsection control method considering both rolling stability and quality of hot rolling band steel Download PDFInfo
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Abstract
The invention belongs to a flatness subsection control method considering both rolling stability and quality of hot rolling band steel. The method comprises the steps of a, dividing the whole length of the band steel into four sections, and adopting a different flatness target control strategy for each section; b, determining the length of a first section according to the width thickness ratio of a band steel finished product, and adopting zero target control on the flatness of the first section; c, taking the finish rolling outlet steel band position when the tail of the first section is rubbed with a recoiling machine as a second section, and adopting non-zero flatness control on the second section; d, taking the finish rolling outlet band steel position when the tail of the second section is cut in a flying mode before finish rolling as a third section, locking the roll bending force at the tail of the second section at the third section, executing the potential non-zero flatness control and feeding back the roll bending regulation amount during the inferior flatness increment; e, taking a part from the tail of the third section to the tail of the steel band as a fourth section and adopting the zero-target control for the flatness of the fourth section. The influence to the rolling stability due to the inferior flatness when the steel band is penetrated and subjected to tail polishing is solved, and the inferior flatness generated after the steel band is cooled to the normal temperature can be prevented.
Description
technical field:
The present invention relates to a kind of hot-continuous-rolling strip steel Bar Rolling Process, specifically refer to take into account the flatness segmentation control method of Hot Rolling Strip stability and quality.
background technology:
Hot-continuous-rolling strip steel rolling schematic flow sheet as shown in Figure 1, slab is come out of the stove after heating furnace is heated to assigned temperature, after de-scaling before roughing, enter roughing mill and carry out the reciprocal rolling of multi-pass, be rolled down to after 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 and be rolled, enter afterwards the cooling runout table of laminar flow and carry out coolingly, then enter downcoiler rolling.The rolling of hot-strip, the cutting edge technology that particularly thin size hot-rolled belt steel rolling is board rolling always, flatness is its main quality control index still not, and flatness is bad easily causes thin gauge strip rolling unstable, seriously cause steel scrap, and then the direct motion of impact production.
Flatness control system is as a part for plat control system, at the utilization of hot-continuous-rolling strip steel comparative maturity, mainly be divided into flatness setting control system and flatness feedback control system, before finish rolling outlet not yet detects band steel flatness, the bending roller force that main employing setting control system sets guarantees that band steel flatness reaches desired value, when flatness instrument detects after band steel flatness, deviation according to flatness detected value and desired value, regulate in real time bending roller force size, make to be with 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 steel enters into after coiling machine, and coiling machine and milling train end frame is 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 bending roller force size before the frame locking of milling train end is batched and built.
Above-mentioned flatness control technology mainly realizes in mm finishing mill unit, and object is that to guarantee that rear band steel shape wave is rolled in finish rolling good, but that band steel also passes through laminar flow after rolling is cooling, batch, a series of processes such as air cooling due to impacts such as initial transverse temperature is uneven, the cold limit of layer portion inhomogeneous coolings, easily cause bilateral wave after uncoiling, for this reason, to rolling rear target, compensate, in the operation of rolling, shut out middle wave, by cooling, batch, after air cooling, reach uncoiling without unrestrained effect, the method is also widely used at present.
From current looked into document, introduce the algorithm design of flatness control system and more by flatness non-zero target being set 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 mentioned flatness feedback control system, total length adopts the non-zero-compensation of the flatness of single 0-8IU, guarantees final shape wave; Patent 1(hot-rolled strip steel moderate sea profile shape controlling, 02133073.5) propose to adopt in the final flatness of unrestrained target control; 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 guarantee final flatness; Patent 3(medium thin slab continuous casting and rolling plate shape integrated control method, 03111285.4) introduced the bending roller force feedback model based on flatness deviation.But as the document of first-class numerous open reports has been showed no band steel total length flatness enforcement segmentation Control the content.
Adopt flatness non-zero target (as middle wave, micro-middle wave) to roll rear cooling grade be feasible on the impact of plate shape in compensation, but due to hot-strip to rolling stability require high, ultra-thin gauge rolling particularly, band steel head enters milling train and instrument, and afterbody is while leaving milling train, has shape wave can produce following problem:
1) if Thin Strip Steel enters, have shape wave before milling train, with steel beat, the probability of nose or sideslip increases considerably, and easily causes and nips unsuccessfully, causes steel scrap.
2) Thin Strip Steel leaves milling train end frame, if there is middle wave, head is easily acutely beated on laminar flow roller-way, and head upwarps, cause batching the difficulty of nipping, also affect the measurement of instrument to head thickness, width, temperature simultaneously, disturb the normal setting of other models to calculate.
3) if band steel while leaving milling train with middle wave, be with steel to be easy to sideslip, cause whipping and roll brokenly, the stability that impact is produced.
For this reason, although all adopt plate shape compensation policy to solve to a certain extent with steel total length, roll the rear cooling impact on plate shape, brought the risk of rolling stability.
summary of the invention:
Content of the present invention is a kind of flatness segmentation control method of taking into account Hot Rolling Strip stability and quality, mainly by hot-strip total length is carried out to segmentation, different segmentations adopts different flatness control strategies, when guaranteeing strip shape quality, improve thin gauge strip rolling stability end to end, as shown in Figure 3.Its key step is as follows:
(
a) band steel total length is divided into 4 sections, respectively by head length computational methods, batch sting steel signal, finish rolling flying shear back-end crop signal is determined segmentation key point position.
(
b) determining with steel first paragraph length and flatness control strategy.The control length of establishing with steel head as shown in Figure 4, is
l 1, when band steel head leaves finish rolling end frame, at 0-
l 1band steel length range in, adopt straight mode to control shape wave, do not adopt any indemnifying measure, band steel smoothness objectives is zero, reduces shape wave and stings on batching the impact that steel and thickness, width, thermometric instrument detect.
l 1length determine relevant with the flakiness ratio with steel, first paragraph length
l 1computing formula as follows:
if (
,
)
Wherein:
l 1: the first section strip steel length, m;
l b: head datum length, relevant with the sense cycle speed of flatness instrument.If instrument sense cycle is less than 100ms, value can be 25-30m, if instrument sense cycle is greater than 100ms, value can be 30-45m;
b: band steel finished width, mm;
h: band steel finished product thickness, mm;
l g: finish rolling end frame is to the distance of coiling machine, m.
(
c) determining with steel second segment length and flatness control strategy.Finish rolling outlet band steel length accumulative total reaches
l 1time, start to enter second segment length, when band 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: the second section strip steel length, m.
As shown in Figure 5, in this length, flatness nonzero value size and hot-strip finished width
bwith finished product thickness
hbetween ratio relevant, if 500≤
b/
h, flatness non-zero target is got 30IU; If 300≤
b/
h<500, flatness non-zero target is got 20IU; If
b/
h<300, flatness non-zero target is got 10IU.
(
d) determining with steel the 3rd segment length and flatness control strategy.Since the second section strip steel length end, while being ON to band steel afterbody 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 frame outlet strip speed, m/s;
T: time, s;
T
1: coiling machine is nipped constantly, s;
T
2: the 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 bending roller force value at the second section strip steel end, implements the potential non-zero control mode of flatness.But if shape wave is excessive, coiling tension is not enough to flattening strap steel, and flatness instrument detects the 3rd section strip steel and occurs visible non-zero flatness deviation, and the 3rd section strip steel flatness feedback function roller regulated quantity is 3.0 times of the corresponding regulated quantity of second segment.
(
e) determining with steel the 4th segment length and flatness control strategy.From the 3rd section of end to band steel afterbody, be defined as the 4th section of band steel, the 4th segment length
l 4computing formula as follows:
Wherein:
l 4: the 4th section strip steel length, m;
T
3: last frame is thrown steel constantly, s.
As shown in Figure 7, in this length, bending roller force is controlled by band steel flatness zero target, according to this payload and roll state constantly, recalculates bending roller force size, guarantee to throw the stability of steel, reduce rolling brokenly or whipping of causing because of middle wave rolling.
accompanying drawing explanation:
Fig. 1 Hot Rolling Strip schematic flow sheet
Fig. 2 hot rolling flatness feedback function block
Schematic diagram is controlled in the segmentation of Fig. 3 hot-strip flatness
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
the specific embodiment:
The 1780mm of Xian Yimou iron and steel enterprise continuous hot-rolling mill is the specific embodiment of example explanation flatness segmentation control method.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, finish rolling end frame is to the distance of coiling machine
l g=95m.
(
a) band steel first paragraph length
l
1
and flatness control strategy
Band steel head length
l 1flatness is controlled the straight method that adopts, and by setting each frame bending roller force size, the desired value that makes flatness is 0IU, according to the response characteristic of flatness instrument, gets
l b=30m,
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 band steel head length is 42m.
In band steel head length, arrive before flatness instrument, the size of each frame bending roller force adopts the bending roller force of process control computer to set calculated value.It is as follows that each frame bending roller force is set calculation procedure:
1) obtain the finishing stand setup result with steel, as the thickness of each frame distributes, draught pressure size, belt steel temperature value etc.
2), according to equal proportion convexity principle between finish rolling end frame export goal plate shape and frame, determine outlet and the entrance convexity size of each frame of finish rolling.
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, try to achieve the characteristic value of comprehensive roll forming separately.
6), according to above data, solve the bending roller force value of each frame.
If the elasticity of ignoring after rolling with steel is recovered, carrying roll gap shape is outlet with the profile of steel, and the carrying Gap crown computation model of each frame can be expressed as:
In above formula,
c hwith
c hbe respectively with steel in the entry and exit of certain frame convexity;
h outwith
h inbe respectively each frame band steel entry and exit thickness;
ηfor convexity coefficient of heredity, each frame value is different;
c mfor mechanical convexity, refer to not consider the load Gap crown that utilizes mechanical model to calculate when supplied materials convexity affects.
c mcalculating adopt inearized model, in model, the influence coefficient of each variable, by Finite Element Method off-line calculation, then obtains through Multiple Non Linear Regression, the expression formula of bending roller force model is as follows:
In formula,
k pfor roll-force influence coefficient;
pfor rolling force setup value;
k ffor bending roller force influence coefficient;
b ffor bending roller force setting value;
k wCfor working roll middle part roll forming influence coefficient;
c wCfor working roll middle part roll forming characteristic value;
k wEfor working roll edge roll forming influence coefficient;
c wEfor working roll edge roll forming characteristic value;
k bCfor support roller middle part roll forming influence coefficient;
c bCfor support roller middle part roll forming characteristic value;
k bEfor support roller limit portion roll forming influence coefficient;
c bEfor support roller limit portion 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 and frame, convexity allocation strategy and self study are relevant.
Adopt as above formula, can obtain the bending roller force setting value of each frame, as shown in table 1 below.
The size of each frame bending roller force adopts above-mentioned bending roller force setting value, can before band steel head length arrives flatness instrument, obtain good flatness, guarantees threading stability.When flatscope detects signal, start flatness closed loop feedback and control, according to actual measurement flatness size, bending roller force is adjusted.
Table 1 first paragraph roller is set and is calculated 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 cons?t(μm) | 75 | 46.8 | 22.8 | 24.5 | 13.6 | 3.7 | 14.2 |
In flatness control system, use be Digital PID Controller, Digital PID Algorithm form is:
In above-mentioned formula:
: last frame
kindividual control cycle end is the calculated value of bending roller force correction constantly, kN.When last frame not empty out-of-date, i=7, otherwise i=6.
e(
k): the
kthe deviate of individual control cycle flatness, IU.
flat(
k) be this cycle flatness measured value,
flat aimfor smoothness objectives value,
e(
k)=
flat aim-
flat(
k).
E (
k-1): the (
k-1) deviate of individual control cycle flatness, IU.It calculates same
e(
k);
k: control cycle sequence number, k=1,2,
k p: proportionality coefficient, it is worth from process control computer;
k i: integral coefficient, it is worth from process control computer;
k d: differential coefficient, it is worth from process control computer;
k f: bending roller force is to flatness influence coefficient, the IU/kN of unit, and it is worth from process control computer;
For example, for the 7th sense cycle of this section, 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 in a upper cycle
e(6)=-18, can obtain:
The flatness deviation in this cycle:
Integration item:
Differential term:
Bending roller force correction:
End frame bending roller force size is adjusted into:
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 is controlled and is adopted micro-middle unrestrained control method, and because target thickness is 3.0mm, the desired value of setting flatness is 10IU.The same first stage of pid control algorithm of flatness feedback.
For example, for the 4th sense cycle of this section, 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 in a upper cycle
e(3)=9, can obtain:
The flatness deviation in this cycle:
Integration item:
Differential term:
Bending roller force correction:
End frame bending roller force size is adjusted into:
(c) band steel the 3rd segment length
l
3
flatness control strategy
Band steel enters after coiling machine, foundation due to tension force, visible shape wave disappears, the bending roller force that now keeps second segment length, if in the 3rd section of operation of rolling, still have visible shape wave, 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, adopts following bending roller force account form:
For example, for the 9th sense cycle of this section, 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 in a upper cycle
e(8)=-2, and the bending roller force at second segment end size lock value
b 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 into:
(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 guarantee the straight bending roller force of plate shape size, and set and issue.But when calculating, because afterbody temperature and head have difference, roll-force
pno longer continue to use head setting value, and take the roll-force measured value mean value of afterbody; Because thermal expansion of rollers causes the variation of comprehensive roll forming, roll forming parameter with wearing and tearing
c wC(working roll middle part roll forming characteristic value),
c wE(working roll edge roll forming characteristic value)
, C bC(support roller middle part roll forming characteristic value)
, C bE(support roller limit portion roll forming characteristic value) takes the renewal value of corresponding computing module.Continue to adopt the formula of first stage, can obtain the bending roller force setting value of the 4th section of each frame, as shown in table 2 below:
The 4th section of roller of table 2 set and calculated 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 at band steel afterbody, guarantees to throw the stability of steel, reduces and rolls brokenly or whipping risk.
(e) implementation result
From rolling stability and strip shape quality two aspects, investigate, evaluate the implementation result of control method of the present invention.Quality objection based on Market Feedback, filter out strip shape quality objection data wherein, after control method of the present invention is implemented, the strip shape quality objection tonnage of continuous 6 months every months compares with the mean value of implementing first 6 months, that is: decline=[(implement front 6 monthly average value-enforcement afterwards every month quality objection)]/implement front 6 monthly average value * 100% of quality objection, after control method of the present invention is implemented, strip shape quality objection interior decline average half a year is 16.50%.Use the same method, statistics because beating with steel, the steel scrap rate that causes of the plate shape problem such as nose, sideslip or whipping, in half a year, decline average is 34.83%.Illustrate that the method for the invention can, when guaranteeing strip shape quality, improve thin gauge strip rolling stability end to end.
Claims (6)
1. a flatness segmentation control method of taking into account Hot Rolling Strip stability and quality, is characterized in that: described method comprises following steps:
a) hot-strip total length is divided into four sections, every section adopts different flatnesses to control target;
b) according to the flakiness ratio with 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 be take flatness zero target as according to calculating, hot-strip has gone out after the frame of finish rolling end, if actual measurement flatness and zero target have deviation, by flatness feedback function, regulate last frame bending roller force, guarantee that the first section strip steel reaches the flatness null value setting;
c) while stinging steel using first paragraph end to coiling machine finish rolling outlet band steel position as second segment length, second segment adopts flatness non-zero control mode, by flatness feedback function, control to adjust last frame bending roller force, guarantee that the second section strip steel reaches the flatness nonzero value setting;
d) using second segment end to finish rolling before 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 bending roller force value at the second section strip steel end, implement potential flatness non-zero control mode, and strengthen the 3rd section strip steel flatness flatness feedback function end frame roller regulated quantity when 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 were calculated each frame bending roller force at that time.
2. a kind of flatness segmentation control method of taking into account Hot Rolling Strip stability and quality according to claim 1, is characterized in that: step
b) in, the length of first paragraph is determined as follows:
if (
,
)
Wherein:
l 1: the first section strip steel length, m;
l b: head datum length, relevant with the sense cycle speed of flatness instrument;
If instrument sense cycle is less than 100ms, value can be 25-30m, if instrument sense cycle is greater than 100ms, value can be 30-45m;
b: band steel finished width, mm;
h: band steel finished product thickness, mm;
l g: finish rolling end frame is to the distance of coiling machine, m.
3. a kind of flatness segmentation control method of taking into account Hot Rolling Strip stability and quality according to claim 1, is characterized in that: step
c) in, the length of second segment is determined as follows:
Wherein:
l 2: the second section strip steel length, m.
4. a kind of flatness segmentation control method of taking into account Hot Rolling Strip stability and quality according to claim 1, is characterized in that: step
d) in, the length of the 3rd section is determined as follows:
Wherein:
l 3: the 3rd section strip steel length, m;
V
s: last frame outlet strip speed, m/s;
T: time, s;
T
1: coiling machine is nipped constantly, s;
T
2: the flying shear back-end crop moment before finish rolling, s.
5. a kind of flatness segmentation control method of taking into account Hot Rolling Strip stability and quality according to claim 1, is characterized in that: step
e) in, the length of the 4th section is determined as follows:
Wherein:
l 4: the 4th section strip steel length, m;
T
3: last frame is thrown steel constantly, s.
6. a kind of flatness segmentation control method of taking into account Hot Rolling Strip stability and quality according to claim 1, is characterized in that: step
d) in, after batching and setting up tension force, visible flatness defect disappears conventionally, and flatness instrument detected value is zero, and now finish rolling end frame locks the bending roller force value at the second section strip steel end, implements the potential non-zero control mode of flatness;
But if 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, and the 3rd section strip steel flatness feedback function roller regulated quantity is 3.0 times of the corresponding regulated quantity of second segment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410166103.5A CN103949481B (en) | 2014-04-23 | 2014-04-23 | Take into account the flatness Discrete control method of Hot Rolling Strip stability and quality |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410166103.5A CN103949481B (en) | 2014-04-23 | 2014-04-23 | Take into account the flatness Discrete control method of Hot Rolling Strip stability and quality |
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| CN103949481A true CN103949481A (en) | 2014-07-30 |
| CN103949481B CN103949481B (en) | 2016-01-13 |
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| CN106457325A (en) * | 2014-09-25 | 2017-02-22 | 东芝三菱电机产业***株式会社 | Flatness control device |
| CN110958918A (en) * | 2017-07-21 | 2020-04-03 | 诺维尔里斯公司 | System and method for controlling flatness of metal substrate by low-pressure rolling |
| CN111085549A (en) * | 2019-12-27 | 2020-05-01 | 山东钢铁集团日照有限公司 | Method for automatically and sectionally discharging strip steel plate shape on line |
| CN112387786A (en) * | 2020-11-04 | 2021-02-23 | 河钢股份有限公司承德分公司 | Flying shear shearing method and device and flying shear equipment |
| CN112732700A (en) * | 2021-01-25 | 2021-04-30 | 中冶赛迪重庆信息技术有限公司 | Steel rolling production data slicing method, system, medium and electronic terminal |
| CN114472542A (en) * | 2022-01-19 | 2022-05-13 | 湖南华菱涟钢特种新材料有限公司 | Method, device and equipment for controlling plate shape in production process of hot-rolled strip steel |
| CN115569997A (en) * | 2022-09-26 | 2023-01-06 | 北京科技大学 | Finish rolling strip steel tail section control method based on machine vision |
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| CN104281088A (en) * | 2014-05-27 | 2015-01-14 | 南京钢铁股份有限公司 | Second-level system progress control method and device of hot rolled strip rolling mill |
| CN106457325A (en) * | 2014-09-25 | 2017-02-22 | 东芝三菱电机产业***株式会社 | Flatness control device |
| CN106457325B (en) * | 2014-09-25 | 2018-06-29 | 东芝三菱电机产业***株式会社 | Flatness control device |
| US11426777B2 (en) | 2017-07-21 | 2022-08-30 | Noveliss Inc. | Systems and methods for controlling surface texturing of a metal substrate with low pressure rolling |
| CN110958918A (en) * | 2017-07-21 | 2020-04-03 | 诺维尔里斯公司 | System and method for controlling flatness of metal substrate by low-pressure rolling |
| US11213870B2 (en) | 2017-07-21 | 2022-01-04 | Novelis Inc. | Micro-textured surfaces via low pressure rolling |
| US11638941B2 (en) | 2017-07-21 | 2023-05-02 | Novelis Inc. | Systems and methods for controlling flatness of a metal substrate with low pressure rolling |
| CN111085549A (en) * | 2019-12-27 | 2020-05-01 | 山东钢铁集团日照有限公司 | Method for automatically and sectionally discharging strip steel plate shape on line |
| CN111085549B (en) * | 2019-12-27 | 2021-05-18 | 山东钢铁集团日照有限公司 | Method for automatically and sectionally discharging strip steel plate shape on line |
| CN112387786A (en) * | 2020-11-04 | 2021-02-23 | 河钢股份有限公司承德分公司 | Flying shear shearing method and device and flying shear equipment |
| CN112732700A (en) * | 2021-01-25 | 2021-04-30 | 中冶赛迪重庆信息技术有限公司 | Steel rolling production data slicing method, system, medium and electronic terminal |
| CN114472542A (en) * | 2022-01-19 | 2022-05-13 | 湖南华菱涟钢特种新材料有限公司 | Method, device and equipment for controlling plate shape in production process of hot-rolled strip steel |
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