CN104148404A - Hot rolled strip flatness automatic control method - Google Patents
Hot rolled strip flatness automatic control method Download PDFInfo
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- CN104148404A CN104148404A CN201310178118.9A CN201310178118A CN104148404A CN 104148404 A CN104148404 A CN 104148404A CN 201310178118 A CN201310178118 A CN 201310178118A CN 104148404 A CN104148404 A CN 104148404A
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Abstract
The invention relates to a hot rolled strip flatness automatic control method. The hot rolled strip flatness automatic control method comprises the following two stages that at the first stage, strip steel is rolled by a finishing mill, and a strip flatness measuring instrument is used for measuring the flatness of the strip steel penetrating out of the finishing mill and comparing the measured flatness with a target value to obtain a deviation value; at the second stage, according to the deviation value obtained by the strip flatness measuring instrument, a feedback control system feeds back the deviation value to the finishing mill in real time, an automatic control system is used for adjusting the roll bending force of the finishing mill to make the flatness of the strip steel reach the target value, and the strip steel is discharged out of the finishing mill and enters a coiling machine to be coiled after being cooled, so that coiled steel is obtained. By means of the hot rolled strip flatness automatic control method, in hot rolled strip production, medium wave control is conducted on the flatness of the strip steel in the hot rolling process, the flatness of the strip steel is effectively improved, and the method is applicable to hot rolling production lines with problems related to the flatness of strip steel products home and abroad and has broad and popularization and application prospect.
Description
Technical field
The invention belongs to hot-strip production technical field, particularly, the present invention relates to a kind of hot-strip glacing flatness autocontrol method, described hot-strip glacing flatness autocontrol method is applicable to the control of glacing flatness in hot-strip production process, can finally improve the glacing flatness of hot-strip product, improve strip shape quality.
Background technology
One of important quality index of hot-strip product is glacing flatness.Glacing flatness is be consistent with the horizontal plane measurement index of degree of steel plate, i.e. the wave of hot-strip or wooden dipper song.Conventionally weigh by unevenness index, it refers to the maximum deviation distance between surface of steel plate and horizontal plane.Glacing flatness also can be with steepness or I unit representation.In fact, the basic reason that causes the glacing flatness problem of hot-strip is the uneven distribution with steel internal residual stress, along the inhomogeneous plastic deformation of strip width, length or thickness direction, phase transformation or Temperature Distribution etc.The wave of hot-strip or wooden dipper song just show in the time that hot-strip internal residual stress is larger.If hot-strip internal residual stress is not enough to cause hot-strip flexing, after steel rolling slitting, there will be wave or wooden dipper song, just can produce potential glacing flatness problem.No matter be the flatness defects of performance or potential flatness defects, the processing that all can have influence on downstream user is used.
In order effectively to control hot-strip glacing flatness, people have manufactured various plate shape control appliances and have developed various technologies, such as hydraulic bending roll, roll shifting, cross roller technology etc.The glacing flatness problem of modern hot-strip be also subject to rolling rear cooling, batch and the impact of all too many levels such as heat treatment, inhomogeneous temperature, stress intensity and phase transformation change, all can be to the mass formation considerable influence of Flatness of Hot Rolled Strip.The band steel that finish rolling glacing flatness is good, through supercooling, batch, after the operation such as annealing, may show flatness defects.Along with user improves constantly the quality requirement to Flatness of Hot Rolled Strip, roll rear cooling, batch and glacing flatness problem that the operation such as heat treatment is brought seems and becomes increasingly conspicuous, become the difficult point of many hot rolling mill production controls and the focus of concern.
Chinese patent CN101372018A discloses a kind of diversified cross-connection control method for plate shape of hot rolling band steel, is applicable to carry out the control of plate shape in hot-rolled strip production line, and object is to improve hot-strip glacing flatness, improves the quality of products.In the method, just comprise that adjusting rolling load and bending roller force dynamically controls, revise hot target flatness control value, employing slight center wave rolling.
Chinese patent CN1485156A discloses unrestrained board-shape control method in a kind of hot-strip, during band steel head is adopted, unrestrained PCSU controls, it is PC setup control, to being with thereafter steel part to adopt wave in dynamic auto plate shape to control, be that dynamic ASC controls, determine unrestrained flatness control in band steel target, calculate fine-rolling strip steel convexity.According to institute's steel rolling kind, specification etc., concrete each coefficient of determining in various computing formula, each constant term and proportionality coefficient, carry out middle wave to finish rolling outlet strip profile and flatness and control, effectively eliminate the bilateral wave producing with steel after finish rolling in laminar cooling process, improved strip quality.
Although above-mentioned technology has proposed amendment glacing flatness desired value, and adopt the method for slight center wave rolling to roll rear inhomogeneous cooling to solve, be too fast the brought limit waveization problem of steel rolling limit portion temperature drop, but the concrete solution of unrestrained autocontrol method in still not proposing.
Summary of the invention
For addressing the above problem, control for wave in effectively implementing in hot-strip production process, the object of the invention is, a kind of hot-strip glacing flatness autocontrol method is provided, finally to improve the glacing flatness problem of hot-strip, improve the quality of belt plate shape.
The present invention is directed to the hot-rolled strip production line of the mm finishing mill unit with 7 tandem mills (F1-F7) composition, the plate profile instrument that detects hot-strip glacing flatness is arranged on to finishing mill outlet, after hot-strip threading, plate profile instrument can detect in real time the glacing flatness with steel and surveyed flatness value and the desired value setting are contrasted, draw deviate, dynamically control according to automatically regulating finishing mill bending roller force to change loading roll gap shape if deviate exceeds preset range, make it reach the target glacing flatness that meets final good belt plate shape.
The technical scheme of a kind of hot-strip glacing flatness autocontrol method of the present invention is as follows:
A kind of hot-strip glacing flatness autocontrol method, is characterized in that,
Described method comprises two stages:
First stage: plate profile instrument presets desired value, band steel shuts out from finishing mill, detects strip profile and flatness through plate profile instrument, and plate profile instrument, by detecting gained strip profile and flatness value and desired value contrast, draws deviate;
Second stage: according to the gained value that deviates, by feedback control system deviate Real-time Feedback to finishing mill, automatically regulate finishing mill bending roller force by automatic control system, make strip profile and flatness reach target flatness value.
According to hot-strip glacing flatness autocontrol method of the present invention, it is characterized in that,
In the described first stage, plate profile instrument needs two glacing flatness desired values, i.e. λ 1=0, λ 2=λ *, λ=30～70I-unit.
The glacing flatness autocontrol method of above-mentioned hot-strip, is characterized in that,
In described second stage, bending roller force adjustment amount is determined by following formula:
Δλ=λ
0-λ
a
Wherein
Build a front λ
0=λ
2, i.e. above-mentioned λ *, λ *=30～70,
A λ after building
0=λ
1, value is 0,
λ
0for target flatness value, unit is I-unit,
λ
afor actual measurement flatness value, unit is I-unit,
△ λ is deviate, and unit is I-unit,
K
pfor ratio, value is 0.001～0.5,
K
ifor storage gain, value is 0.001～0.5 conventionally,
△ FB bending roller force adjustment amount.
According to above-mentioned hot-strip glacing flatness autocontrol method, it is characterized in that, in order to consider the impact of tension force on glacing flatness, set flatness control desired value, the glacing flatness of building a front hot-strip is wave value in, and after building, the glacing flatness of hot-strip is 0, as shown in Figure 2.
The glacing flatness autocontrol method of above-mentioned hot-strip, is characterized in that, it is 600mm～2100mm that described hot-strip is produced strip width.
The glacing flatness autocontrol method of above-mentioned hot-strip, is characterized in that, the described thickness of producing with steel with steel is 2mm～20mm.
The glacing flatness autocontrol method of above-mentioned hot-strip, is characterized in that, describedly produces coiling temperature scope with steel at 100 DEG C～850 DEG C with steel.
By hot-strip method for controlling planeness of the present invention, in hot-strip is produced, implement the micro-middle wave of course of hot rolling strip profile and flatness and controlled, can roll rear operation limit waveization tendency by effective compensation, carry out Data Comparison by building Zhang Qianhou, improved strip profile and flatness problem.For example certain equipment of Hot Strip Mill adopts after this technology, and the following process that causes because strip profile and flatness is bad surface is wiped to scratch from 7.9% and is reduced to below 1.5%, and lumber recovery is brought up to more than 95.0% from 79.8%.For the hot rolling line that has strip profile and flatness problem both at home and abroad, method is suitable for, and popularizing application prospect is wide.
Brief description of the drawings
Fig. 1 is Hot Line schematic diagram.
Fig. 2 is flatness control schematic diagram.
Fig. 3 is flatness control one example.
In figure, 1-heating furnace, 2-roughing mill, 3-finishing mill, 4-plate shape machine, 5-laminar flow is cooling, 6-coiling machine.
Detailed description of the invention
The method for controlling planeness of hot-strip of the present invention, comprises two stages: the first stage: band steel shuts out from finishing mill 2, detects and passes the glacing flatness after finishing mill 3 and contrast with desired value with steel through plate profile instrument 4, draws deviate;
Second stage: according to the deviate of plate profile instrument 4, by feedback control system deviate Real-time Feedback to finishing mill 3, automatically regulated the bending roller force of finishing mill 3 by automatic control system, make strip profile and flatness reach desired value, be with subsequently steel to shut out and enter coiling machine 6 after cold flow cooling 5 from finishing mill and batch, obtain coil.
Embodiment 1
To the hot-strip product of certain steel grade specification, micro-middle wave value 50I-unit is set, adopt said method, working control is as Fig. 3.
Adopt the micro-middle unrestrained autocontrol method of the technical program to produce, as shown in table 1 is hot-strip glacing flatness and cooling rear strip profile and flatness.
Table 1 strip profile and flatness changes
Embodiment 2
To the size hot-rolled belt steel product of certain steel grade, micro-middle wave value 70I-unit is set, adopt the micro-middle unrestrained autocontrol method of the technical program to produce, table 2 is depicted as hot-strip glacing flatness and cooled strip profile and flatness.
Table 2 strip profile and flatness changes
Embodiment 3
To the size hot-rolled belt steel product of certain steel grade, micro-middle wave value 30I-unit is set, adopt the micro-middle unrestrained autocontrol method of the technical program to produce, table 3 is depicted as hot-strip glacing flatness and cooled strip profile and flatness.
Table 3 strip profile and flatness changes
Claims (6)
1. a hot-strip method for controlling planeness, is characterized in that,
Described method comprises two stages:
First stage: plate profile instrument presets desired value, band steel shuts out from finishing mill, detects strip profile and flatness through plate profile instrument, and plate profile instrument, by detecting gained strip profile and flatness value and desired value contrast, draws deviate;
Second stage: according to drawn deviate, by feedback control system deviate Real-time Feedback to finishing mill, regulate finishing mill bending roller force by automatic control system, make strip profile and flatness reach desired value.
2. according to the glacing flatness autocontrol method of hot-strip claimed in claim 1, it is characterized in that, in the described first stage, plate profile instrument needs two glacing flatness desired values, i.e. λ 1=0, λ 2=λ *, λ *=30～70I-unit.
3. according to the glacing flatness autocontrol method of hot-strip claimed in claim 1, it is characterized in that, in described second stage, bending roller force adjustment amount is determined by following formula:
Δλ=λ
0-λ
a
Wherein
Build a front λ
0=λ
2, i.e. above-mentioned λ *,
A λ after building
0=λ
1, value is 0,
λ
0for target glacing flatness, unit is I-unit,
λ
afor actual measurement glacing flatness, unit is I-unit,
△ λ is deviate, and unit is I-unit,
K
pfor ratio, value is 0.001～0.5,
K
ifor storage gain, value is 0.001～0.5 conventionally,
△ FB is bending roller force adjustment amount.
4. according to hot-strip glacing flatness autocontrol method claimed in claim 1, it is characterized in that, the width that described hot-strip is produced with steel is 600mm～2100mm.
5. according to the glacing flatness autocontrol method of hot-strip claimed in claim 1, it is characterized in that, the described thickness of producing with steel with steel is 2mm～20mm.
6. according to the glacing flatness autocontrol method of hot-strip claimed in claim 1, it is characterized in that, describedly produce coiling temperature scope with steel at 100 DEG C～850 DEG C with steel.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104772341A (en) * | 2015-04-28 | 2015-07-15 | 武汉科技大学 | Optimal setting method for bending roller of hot-continuous-rolling finishing mill set |
| CN106607459A (en) * | 2015-10-27 | 2017-05-03 | 宝山钢铁股份有限公司 | Wedge control system and method for hot rolled strip steel |
| CN107442578A (en) * | 2016-05-31 | 2017-12-08 | 本钢板材股份有限公司 | A kind of cold rolling superthin CVC board-shape control methods |
| CN108817101A (en) * | 2018-04-23 | 2018-11-16 | 河钢股份有限公司承德分公司 | A kind of slight center wave rolling method based on the curved roll shifting model optimization of Siemens |
| CN110653269A (en) * | 2018-06-29 | 2020-01-07 | 上海梅山钢铁股份有限公司 | On-line closed-loop control method for hot continuous rolling strip flatness |
| CN111215455A (en) * | 2018-11-26 | 2020-06-02 | 宝山钢铁股份有限公司 | Device and method for controlling flat plate shape of hot-rolled thin strip steel |
| CN112828053A (en) * | 2021-01-04 | 2021-05-25 | 宝钢湛江钢铁有限公司 | Method for detecting full-length plate shape of cooled strip steel |
| 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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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104772341A (en) * | 2015-04-28 | 2015-07-15 | 武汉科技大学 | Optimal setting method for bending roller of hot-continuous-rolling finishing mill set |
| CN106607459A (en) * | 2015-10-27 | 2017-05-03 | 宝山钢铁股份有限公司 | Wedge control system and method for hot rolled strip steel |
| CN107442578A (en) * | 2016-05-31 | 2017-12-08 | 本钢板材股份有限公司 | A kind of cold rolling superthin CVC board-shape control methods |
| CN108817101A (en) * | 2018-04-23 | 2018-11-16 | 河钢股份有限公司承德分公司 | A kind of slight center wave rolling method based on the curved roll shifting model optimization of Siemens |
| CN108817101B (en) * | 2018-04-23 | 2020-08-28 | 河钢股份有限公司承德分公司 | micro-Zhonglang rolling method based on Siemens bending and roll shifting model optimization |
| CN110653269A (en) * | 2018-06-29 | 2020-01-07 | 上海梅山钢铁股份有限公司 | On-line closed-loop control method for hot continuous rolling strip flatness |
| CN110653269B (en) * | 2018-06-29 | 2021-04-06 | 上海梅山钢铁股份有限公司 | On-line closed-loop control method for hot continuous rolling strip flatness |
| CN111215455A (en) * | 2018-11-26 | 2020-06-02 | 宝山钢铁股份有限公司 | Device and method for controlling flat plate shape of hot-rolled thin strip steel |
| CN112828053A (en) * | 2021-01-04 | 2021-05-25 | 宝钢湛江钢铁有限公司 | Method for detecting full-length plate shape of cooled strip steel |
| 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 |
| CN114472542B (en) * | 2022-01-19 | 2024-07-09 | 湖南华菱涟钢特种新材料有限公司 | Plate shape control method, device and equipment in hot rolled strip steel production process |
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Application publication date: 20141119 |