CN102581038B - Steel strip tail deviation control method - Google Patents
Steel strip tail deviation control method Download PDFInfo
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- CN102581038B CN102581038B CN 201110007248 CN201110007248A CN102581038B CN 102581038 B CN102581038 B CN 102581038B CN 201110007248 CN201110007248 CN 201110007248 CN 201110007248 A CN201110007248 A CN 201110007248A CN 102581038 B CN102581038 B CN 102581038B
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Abstract
The invention discloses a steel strip tail deviation control method, which includes: locking the rolling force deviation of an Fx rolling mill and setting the same as the automatic leveling target for the next roll after steel blasting of an Fx-1 or Fx-2 rolling mill; judging whether the deviation of rolling force of two sides of the Fx rolling milling within the nth sampling cycle by an automatic leveling system of the Fx rolling mill varies or not, and determining that the steel strip deviates if the rolling force deviation varies; computing the leveling amount of the nth sampling cycle by the automatic leveling system for the Fx rolling mill and judging whether the leveling amount exceeds the maximum limit value of the Fx rolling mill or not; raising or pressing transmission side roll gap according to the maximum limit value of the Fx rolling mill if the leveling amount exceeds the maximum limit value; and raising or pressing the transmission side roll gap according to the leveling amount if the leveling amount does not exceed the maximum limit value.
Description
Technical field
The present invention relates to a kind of belt steel rolling control method, relate in particular to a kind of control with the method for steel tail deviation.
Background technology
The hot-strip afterbody is the technique change process of a complexity, and because of the limitation of present each operation technology, the rolled piece of absolute ideal is non-existent.Even also there is certain difference in some aspects in the identical band steel of kind and specification, these differences comprise: afterbody temperature contrast, afterbody difference in thickness, afterbody template difference etc.And with the time of steel afterbody by finishing mill very short, the time of leaving control system control for is very limited (only having for 0.4 second) the most in short-term again, so be difficult to the method that finds automatic control sideslip and roll brokenly.
Therefore, depend at present operating personnel's manual control with the steel tail deviation.Hand operated control method with the steel tail deviation is as shown in Figure 1 following: operating personnel estimate with the sideslip situation of steel afterbody in each frame, this frame roll gap leveling button of manual adjustments, when finding band steel 1 to the transmission side sideslip, regulating transmission side roll gap 2 presses down, lift on the active side roll gap 3, the band steel is moved to active side.On the contrary, when finding the band steel to the active side sideslip, regulate the active side roll gap and press down, lift on the transmission side roll gap, the band steel is moved to transmission side, reach control with the purpose of steel tail deviation with this.
Yet, there is following shortcoming with the hand operated control method of steel tail deviation:
1. rely on naked eyes to judge strip running deviation fully, may discover at the initial stage that sideslip occurs hardly, incured loss through delay Deal with Time;
2. because throwing steel speed is fast, very short by the time of milling train with the steel afterbody, rely on the reaction time of manually control not enough fully;
3. because belt plate shape and temperature often change, carry out in advance leveling meeting according to lastblock band steel and cause error in judgement.
Summary of the invention
The purpose of this invention is to provide a kind of control method with steel tail sideslip, the method is judged the direction of strip running deviation by rolling force deviation, thereby effectively control is with the sideslip problem of steel afterbody in milling train, and reduces rolling brokenly of causing therefrom, blemish and accident roller problem.
Mm finishing mill unit is comprised of 7 frames usually, and each frame is comprised of a pair of backing roll and a pair of working roll.The both sides of each frame are respectively arranged with pressure sensor and position sensor, can measure respectively roll-force size and the roll gap size of every pair of working roll transmission side and active side.Because strip running deviation or other factors can cause the roll-force generation deviation of frame both sides, utilize and just can judge sideslip direction and degree with steel to the analysis of rolling force deviation.
The inventor causes the reason of roll-force generation deviation to mainly contain by thinking:
1) impact of wedge shape: the rolled piece active side is thick, and the active side roll-force is large;
2) impact of rolled piece sideslip: the active side of the whole deflection of rolled piece rolling centerline: the active side roll-force is large;
3) impact of rolled piece both sides temperature: rolled piece active side temperature is low, and the active side roll-force is large;
4) the uneven impact of upper working rolls and lower working rolls: rolled piece active side roll gap is little, and the active side roll-force is large;
5) impact of gauge factor: because pressure-measuring head detects the deviation that causes, may cause that one-sided roll-force is large.
Above-mentioned these rolling deviation sources can be divided into two classes:
First kind deviation: the deviation that rolled piece roll location of living in itself is brought.Because rolled piece is in the operation of rolling, can not stablize motionlessly fully at theoretical rolling center, but rolling in an inclined to one side side, the reason of its initiation has multiple, as because impact of guide plate centering etc.Cause the deviation of both sides roll-force for the first kind, if carry out manual leveling, if the active side roll-force is large, then think the inclined to one side active side of rolled piece, thereby need to press down processing to the active side roll gap, lift processing on the transmission side roll gap is carried out.
The Equations of The Second Kind deviation: because a side of roll has been subject to the deviation that larger roll-force causes, but not inclined to one side this side of rolled piece.The reason of its initiation comprises: the impact of the impact of wedge shape, rolled piece both sides temperature, the uneven impact of roll up-down rollers roll gap etc.Cause the deviation of both sides roll-force for Equations of The Second Kind, if carry out manual leveling, if the active side roll-force is large, think that then rolled piece is little at the active side roll gap, or active side (temperature is low) material is hard, if roll-force is carried out leveling, then need active side carried out to lift processing, the roll gap of transmission side is pressed down processing.
Can find out from top analysis, because the adjusting direction of above-mentioned two kinds of deviations is antipodal, so if will control strip running deviation, it is leading to need to determine that any deviation accounts for, thereby judges accordingly control, and ignores another kind of deviation.The inventor thinks that by analysis for monoblock band steel, first kind deviation is the particularity factor, and the Equations of The Second Kind deviation is the universality factor.Therefore, first kind deviation is available deviation, should carry out accordingly automatic leveling control, and the second deviation can be ignored, and the reasons are as follows:
1) for the impact of wedge shape: because the leveling of roughing is to adopt the total length leveling, not leveling when rolling is so can think that wedge shape is being relatively uniform along whole intermediate blank direction;
2) for the impact of both sides temperature: when heating, according to layout and the direction of burner, and contact with the external world when rolling, can think relatively that the variation of both sides temperature and slab length do not have much relations.Although slightly high at the middle part board briquette, the both sides with the middle part have a little difference end to end, it is basically identical changing on the broad ways;
3) the uneven impact of the roll gap of roll up-down rollers: if do not carry out leveling, the leveling of rolling both sides is to keep stable in the operation of rolling, so it is consistent to regard band steel total length as.In addition, the inventor adopts manually to press down to test and carries out both sides roll-force mutation analysis under as-rolled condition, finds the both sides roll-force when pressing down about 200um, and roll-force changes in 5 tons, frame F3, and 4,5 respectively press down 100um causes the roll-force situation of change.Therefore can find out that its roll-force changes in 5 tons, even less than systematic instrument fluctuating error.
Controlling party ratio juris of the present invention is exactly: the upstream frame is thrown the moment of steel, and the both sides roll-force of downstream frame is carried out the value locking, thinks that at this time all deviations all are to be caused by the Equations of The Second Kind deviation.If after the value locking, deviation occurs in roll-force both sides again, then think this moment institute influential all be that " rolling force deviation that the " center " position causes namely is with steel that sideslip has occured when locking because the band steel leaves.
The present invention provides a kind of control method with the steel tail deviation according to the foregoing invention purpose, its by on lift or depress the operation roll of mill transmission side roll gap band steel tail deviation is controlled, specifically comprise the following steps:
(1) works as F
X-1Or F
X-2After milling train is thrown steel, locking F this moment
xThe rolling force deviation Δ F of milling train
(DS-OS) LockOn, with it as the self-leveling target of follow-up roll;
ΔF
(DS-OS)LockOn＝F
DS-F
OS
In the formula: Δ F
(DS-OS) LockOnBe locking F constantly
xThe rolling force deviation of milling train both sides;
F
DSBe F
xThe roll-force of milling train transmission side;
F
OSBe F
xMilling train active side roll-force;
Above-mentioned locking is to select F constantly
X-1Milling train is thrown behind the steel or F
X-2Milling train can be selected according to the reaction time of milling train after throwing steel.
(2) after the time-delay through one period reaction time, F
xThe milling train automatic horizontal control system is judged F
xWhether milling train at the rolling force deviation of n its both sides of sampling period variation has occured:
ΔF
(DS-OS)(n)＝ΔF
(DS-OS)LockOn-ΔF
(DS-OS)ist(n)
In the formula: Δ F
(DS-OS) ist(n) be at n sampling period F
xThe rolling force deviation of milling train both sides;
If Δ F
(DS-OS)(n) be 0, F is described
xMilling train does not change at the rolling force deviation of n its both sides of sampling period, does not then enter next step; If Δ F
(DS-OS)(n) be not 0, F is described
xVariation has occured in the rolling force deviation of milling train n its both sides of sampling period, that is to say that sideslip has occured band steel afterbody, then enters next step and carries out leveling; In the above-mentioned reaction time, operating personnel can judge that those skilled in that art should know the relevant empirical value of this and milling train self operating mode according to the working condition of milling train, and generally this numerical value is 1～60ms.
(3) F
xThe milling train automatic horizontal control system calculates the leveling amount Δ S (n) in n sampling period:
ΔS(n)＝M*Kc*Kh*Kw*Kft*ΔF
(DS-OS)(n)
In the formula: M is the stiffness coefficient of milling train; Kc is the conversion coefficient of roll-force and roll gap; Kh is the thickness correction factor, Kh=Kh
x/ h, Kh
xF
xThe experience thickness coefficient of milling train, h are the finished frame target thickness; Kw is the width correction coefficient, Kw=Kw
x/ w, Kw
xF
xThe experience spread factor of milling train, w are the finished frame target width; Kft is temperature correction coefficient, Kft=(1160-Kft
x)/ft, Kft
xF
xThe experience finishing temperature coefficient of milling train, ft is the target finishing temperature; Above-mentioned and F
xThe empirical coefficient that milling train is relevant all determines that by the milling train self attributes those skilled in that art should know these empirical values according to the self attributes of milling train.
(4) F
xThe milling train automatic horizontal control system judges whether the leveling amount Δ S (n) in n sampling period has exceeded F
xThe maximum limit amplitude of milling train: if then carry out step (5b); If not, then carry out step (5a); F
xThe maximum limit amplitude of milling train is the fixed attribute of frame, and those skilled in that art should know each property parameters of its operated milling train.
If (5a) the leveling amount Δ S (n) in n sampling period be on the occasion of, then lift Δ S (n) on the transmission side roll gap; If it is negative value, then the transmission side roll gap presses down Δ S (n), then carries out step (6);
If (5b) the leveling amount Δ S (n) in n sampling period be on the occasion of, then lift F on the transmission side roll gap
xThe maximum limit amplitude of milling train; If it is negative value, then the transmission side roll gap presses down F
xThen the maximum limit amplitude of milling train carries out step (6);
(6) F
xMilling train is thrown steel, and control finishes.
Preferably, the described sampling period is 1～50ms, can require according to the difference to control accuracy to choose.
The present invention is by adopting technique scheme, so that control has replaced Artificial Control automatically, and the control effect is very good, because the accident roller that causes with the steel tail deviation declines to a great extent.
Description of drawings
Come the control method with the steel tail deviation of the present invention is described further below in conjunction with the drawings and specific embodiments.
Fig. 1 is existing hand operated control method schematic diagram with the steel tail deviation.
Fig. 2 is the control method schematic diagram with the steel tail deviation of the present invention.
The specific embodiment
In the present embodiment, take the employed 2050 hot rolling line mm finishing mill unit of inventor as example, the frame that manufactures a finished product target thickness h=2.5mm, finished frame target width w=1173mm, the band steel that the target finishing temperature is ft=860 ℃, mill modulus are 1.67um/t.According to as shown in Figure 2 flow process to F
7Frame is regulated:
(1) beginning;
(2) F
6Milling train is thrown steel, and pressure sensor records F this moment
7The rolling force deviation of operation roll of mill both sides is 0t, is locked so to be Δ F
(DS-OS) LockOn
(3) judge whether delay time reaches 30ms, after delay time reaches the 30ms of setting, F
7Milling train automatic horizontal control system input control;
(4) F that gets according to the pressure sensor Real-time Measuring
7The roll-force value of operation roll of mill both sides is learnt F
7Milling train is within the 1st sampling period, and the rolling force deviation of its both sides is 20t, so than Δ F
(DS-OS) LockOn, rolling force deviation has changed-20t;
(5) F
7The milling train automatic horizontal control system calculates the leveling amount Δ S (n) in this sampling period according to the empirical coefficient of 2050 hot rolling lines shown in following formula and the table 1:
ΔS(n)＝M*Kc*Kh*Kw*Kft*ΔF
(DS-OS)(n)
The milling train empirical coefficient of table 1.2050 hot rolling line
| Frame | F 1 | F 2 | F 3 | F 4 | F 5 | F 6 | F 7 |
| Kc | 0.3-1.3 | 1.5-2.5 | 2-3 | 2.5-3.5 | 2.5-3.5 | 2-3 | 2-3 |
| Khx | 1.3-2.3 | 1.3-2.3 | 1.5-2.5 | 1.8-2.8 | 2.3-3.3 | 2.7-3.7 | 3.1-4.1 |
| Kwx | 500-1500 | 500-1500 | 500-1500 | 550-1650 | 600-1800 | 650-1950 | 700-2100 |
| Kftx | 150-450 | 150-450 | 150-450 | 150-450 | 150-450 | 150-450 | 150-450 |
In table 2. present embodiment according to the selected value of table 1
| Frame | F1 | F2 | F3 | F4 | F5 | F6 | F7 |
| Kc | 0.8 | 2 | 2.5 | 3 | 3 | 2.5 | 2.5 |
| Khx | 1.8 | 1.8 | 2 | 2.3 | 2.8 | 3.2 | 3.6 |
| Kwx | 1000 | 1000 | 1000 | 1100 | 1200 | 1300 | 1400 |
| Kftx | 300 | 300 | 300 | 300 | 300 | 300 | 300 |
ΔS＝M*Kc*Kh*Kw*Kft*ΔF
(DS-OS)
＝1.67×2.5×(3.6/2.5)×(1400/1173)×((1160-300)/860)×(-20)
＝-144um
For 2050 hot rolling lines, milling train F
1-F
5The permission regulated quantity be ± 300-900um; Milling train F
6Allow regulated quantity to be ± 200-600um; Milling train F
7Allow regulated quantity to be ± 250-750um.According to above-mentioned value range, select milling train F in the present embodiment
7Maximum amplitude limit amount be ± 500um.
(6) F
7The milling train automatic horizontal control system judges whether leveling amount Δ S (1) has exceeded F
7The maximum limit amplitude of milling train :-144um does not exceed F
7Maximum amplitude limit amount be ± 500um.
(7) carry out leveling according to leveling amount Δ S (1), will press down on the transmission side roll gap-144um.
(8) F
7Milling train is thrown steel, and control finishes.
Be noted that above enumerate only for specific embodiments of the invention, obviously the invention is not restricted to above embodiment, many similar variations are arranged thereupon.If those skilled in the art all should belong to protection scope of the present invention from all distortion that content disclosed by the invention directly derives or associates.
Claims (2)
1. the control method with the steel tail deviation is characterized in that, comprises the following steps:
(1) works as F
X-1Or F
X-2After milling train is thrown steel, locking F this moment
xThe rolling force deviation of milling train, with it as the self-leveling control target of follow-up roll;
ΔF
(DS-OS)LockOn＝F
DS-F
OS
In the formula: Δ F
(DS-OS) LockOnBe locking F constantly
xThe rolling force deviation of milling train both sides;
F
DSBe F
xThe roll-force of milling train transmission side;
F
OSBe F
xMilling train active side roll-force;
(2) after the time-delay through one period reaction time, F
xThe milling train automatic horizontal control system is judged F
xWhether milling train at the rolling force deviation of n its both sides of sampling period variation has occured:
ΔF
(DS-OS)(n)＝ΔF
(DS-OS)LockOn-ΔF
(DS-OS)ist(n)
In the formula: Δ F
(DS-OS) ist(n) be at n sampling period F
xThe rolling force deviation of milling train both sides;
If Δ F
(DS-OS)(n) be 0, then do not enter next step; If Δ F
(DS-OS)(n) be not 0, then enter next step;
(3) F
xThe milling train automatic horizontal control system calculates the leveling amount Δ S (n) in n sampling period, and the computing formula of the leveling amount Δ S (n) in n sampling period is:
ΔS(n)＝M*Kc*Kh*Kw*Kft*ΔF
(DS-OS)(n)，
In the formula: M is the stiffness coefficient of milling train; Kc is the conversion coefficient of roll-force and roll gap; Kh is the thickness correction factor, Kh=Kh
x/ h, Kh
xF
xThe experience thickness coefficient of milling train, h are the finished frame target thickness; Kw is the width correction coefficient, Kw=Kw
x/ w, Kw
xF
xThe experience spread factor of milling train, w are the finished frame target width; Kft is temperature correction coefficient, Kft=(1160-Kft
x)/ft, Kft
xF
xThe experience finishing temperature coefficient of milling train, ft is the target finishing temperature;
(4) F
xThe milling train automatic horizontal control system judges whether the leveling amount Δ S (n) in n sampling period has exceeded F
xThe maximum limit amplitude of milling train: if then carry out step (5b); If not, then carry out step (5a);
If (5a) the leveling amount Δ S (n) in n sampling period be on the occasion of, then lift Δ S (n) on the transmission side roll gap; If it is negative value, then the transmission side roll gap presses down Δ S (n), then carries out step (6);
If (5b) the leveling amount Δ S (n) in n sampling period be on the occasion of, then lift F on the transmission side roll gap
xThe maximum limit amplitude of milling train; If it is negative value, then the transmission side roll gap presses down F
xThen the maximum limit amplitude of milling train carries out step (6);
(6) F
xMilling train is thrown steel, and control finishes.
2. the control method with the steel tail deviation as claimed in claim 1 is characterized in that, the described sampling period is 1～50ms.
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|---|---|---|---|
| CN 201110007248 CN102581038B (en) | 2011-01-14 | 2011-01-14 | Steel strip tail deviation control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110007248 CN102581038B (en) | 2011-01-14 | 2011-01-14 | Steel strip tail deviation control method |
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| CN102581038B true CN102581038B (en) | 2013-10-30 |
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| CN103920721B (en) * | 2013-01-11 | 2016-02-24 | 宝山钢铁股份有限公司 | Control the method for strip steel head stability in course of hot rolling |
| CN104174658B (en) * | 2014-08-04 | 2016-03-09 | 山西太钢不锈钢股份有限公司 | A kind of preventing is with steel material tail to run the method for material |
| CN104307892B (en) * | 2014-11-06 | 2016-04-13 | 广西柳州银海铝业股份有限公司 | The method of band head correction in tandem rolling crossing process |
| CN104384203B (en) * | 2014-11-16 | 2016-07-06 | 新余钢铁集团有限公司 | Prevention thickness is not more than the milling method of 4mm hot-strip sideslip |
| CN106345819B (en) * | 2015-07-16 | 2017-10-31 | 宝山钢铁股份有限公司 | A kind of control method of hot continuous rolling fine-rolling strip steel afterbody rolling stability |
| CN106975665B (en) * | 2016-01-19 | 2019-09-20 | 宝山钢铁股份有限公司 | A kind of milling equipment precision online test method |
| CN107824618B (en) * | 2016-09-15 | 2019-03-26 | 上海梅山钢铁股份有限公司 | Tail part of band steel automatic deviation correction control method |
| CN110834033B (en) * | 2018-08-17 | 2020-12-08 | 上海梅山钢铁股份有限公司 | Automatic deviation rectifying control method for hot continuous rolling finishing mill group strip steel |
| CN110328245B (en) * | 2019-07-02 | 2021-03-26 | 北京首钢股份有限公司 | Method and device for controlling tail flicking of strip steel |
| CN111530940B (en) * | 2020-05-09 | 2021-05-25 | 河钢股份有限公司承德分公司 | Steel rolling drift automatic adjusting method based on bounce theory |
| CN111922094B (en) * | 2020-07-09 | 2022-06-14 | 首钢京唐钢铁联合有限责任公司 | Control method for automatically setting horizontal value of head of strip steel and finishing mill system |
| CN113042538B (en) * | 2021-03-03 | 2023-02-17 | 首钢京唐钢铁联合有限责任公司 | Control method and device for rolling deviation of hot rolled strip steel |
| CN114367544B (en) * | 2021-12-03 | 2023-01-20 | 北京科技大学 | Hot continuous rolling steady-state deviation rectifying control model |
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| CN101091966A (en) * | 2006-06-19 | 2007-12-26 | 鞍钢股份有限公司 | Doubling deviation rectified control system for strip steel at entry of rolling mill in continuous rolling mill train |
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| JPS62114714A (en) * | 1985-11-14 | 1987-05-26 | Kawasaki Steel Corp | Lap preventive method for rolling plate in hot continuous rolling |
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| CN101091966A (en) * | 2006-06-19 | 2007-12-26 | 鞍钢股份有限公司 | Doubling deviation rectified control system for strip steel at entry of rolling mill in continuous rolling mill train |
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