CN105268747B - Hot rolled strip convexity on-line closed loop control method - Google Patents
Hot rolled strip convexity on-line closed loop control method Download PDFInfo
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Abstract
The invention relates to a hot rolled strip convexity on-line closed loop control method. The method is characterized by comprising the following steps that (1) strip steel reaches an inlet of a finishing rolling unit, the required roll bending force set value of each rack of the finishing rolling unit is worked out through a finish rolling model according to temperature, thickness, width and materials of the strip steel and real-time roll shape of the rolls; (2) after each rack of the finishing rolling unit bites steel, the roll bending force of each rack is switched from balance force to the roll bending set value worked out through the finish rolling model; (3) during rolling of the finishing rolling unit, certain adjustment for the roll bending force is conducted according to change of the rolling force of each rack by means of the strip shape keeping function; and (4) the closed-loop control over strip steel convexity is added, during rolling of the finishing rolling unit, the adjustment value of the required roll bending force of each rack is worked out by means of a convexity-to-roll bending force conversion algorithm according to the deviation between the set value and a strip steel convexity feedback value real-timely detected by a finish rolling outlet profile gauge, the roll bending force of each rack of the finishing rolling unit is real-timely adjusted, and the closed-loop control over the strip steel convexity is achieved.
Description
Technical field
The present invention relates to a kind of closed loop control method, more particularly to a kind of hot rolled strip convexity line closed loop control method.
Background technology
With the demand in market, in order to realize profit, product is constantly to high-end expansion, control of product quality essence for hot rolling enterprise
Degree more and more higher, in addition to thickness, the width control system precision of former concern, also requires that non-to the Crown control precision of hot-rolled product
Chang Yange, especially for high-end products such as Automobile Plate, silicon steel, it will also in addition to requiring the overall control accuracy height of product
Ask on the premise of overall control accuracy height, the homogeneity of product is high, i.e. control accuracy fluctuation is the smaller the better.But, it is hot at present
The Crown control for rolling enterprise's strip is all by the roll shifting with roll shape with finish rolling model（Some milling trains are cross rollers）And roller is come
Control is realized, finish rolling model calculates finish rolling according to the supplied materials temperature of strip steel, thickness, width, material, the real-time roll shape of roll
Roll shifting amount needed for each frame（Or the angle of the crossing）And the setting value of bending roller force, so as to realize the Crown control to product.Thus deposit
In following two problems, one, control of the finish rolling model to convexity be delayed.When the head Crown control of this block steel is exceeded,
It can only adjust the bending roller force to optimize each frame of finish rolling and roll shifting position by the self study to next block of steel, convex so as to improve
Degree control accuracy, this process generally requires the continuous self study of several blocks of steel and can be only achieved preferable effect；2nd, finish rolling model pair
The control of convexity is not line closed loop control.For same steel, bending roller force setting of the model to each frame of finish rolling is once
Property, will not change in the operation of rolling, it is to keep function to realize by plate shape to the adjustment of bending roller force, i.e., according to rolling
Certain adjustment is done in the change of frame roll-force in journey to bending roller force, and it is not using the actually detected convexity for arriving of strip steel as ginseng
Examine, in practice it has proved that this plate shape keep function to the adjustment of bending roller force relative to strip steel Crown control poor effect, even if
The bending roller force of model specification makes the convexity precision of strip steel head very well, in the operation of rolling, due to strip length direction temperature, thickness
The change of the process conditions such as degree, will also result in afterbody convexity precision in strip steel very poor.So, develop a kind of hot rolled strip convexity and exist
Line closed loop control method, the Crown control precision to improving product is very necessary.
The content of the invention
The present invention is exactly for technical problem present in prior art, there is provided a kind of hot rolled strip convexity closed loop control
Method, when solving to roll this kind of product in current hot rolling enterprise, the not high problem of product Crown control precision.
To achieve these goals, the technical solution used in the present invention is as follows, a kind of hot rolled strip convexity line closed loop control
Method processed, it is characterised in that methods described step is as follows, 1）Strip steel reaches mm finishing mill unit entrance, and finish rolling model is according to strip steel
The bending roller force setting value of temperature, thickness, width, material, the real-time roll shape of roll needed for calculate each frame of finish rolling；2）Finish rolling is each
Frame is stung after steel, and the bending roller force of each frame is switched to the roller setting value of finish rolling model calculating from equilibrant；3）In mm finishing mill unit
In the operation of rolling, plate shape keeps function to carry out certain adjustment to bending roller force according to the change of the roll-force of each frame；4）Increase band
The closed loop control of steel convexity, it is anti-according to the strip profile that finish rolling exports profile gauge real-time detection in the mm finishing mill unit operation of rolling
Feedback value and the deviation of setting value, by a kind of convexity the algorithm of bending roller force is changed, and calculates the adjustment of bending roller force needed for each frame
Value, to the bending roller force of each frame of mm finishing mill unit real-time adjustment is carried out, and realizes the closed loop control of strip profile.
Used as a modification of the present invention, the closed loop control concrete grammar of strip profile is as follows in the step 4,
4.1）The deviation of strip profile is calculated,
The convexity setting value that model is issued：Pref units um；
The belt steel thickness setting value that model is issued：Href units mm；
Convexity sets coefficient：Pref_k units pu；
Pref_k=Pref/1000/ Href；
Crown feedback value：Pfbk units um；
Crown feedback coefficient：Pfbk_k units pu；
Pfbk_k=Pfbk/1000/ Href；
Convexity deviation：Perr units pu；
Perr=Pref_k-Pfbk_k；
4.2）The coefficient of each frame bending roller force of convexity deviation conversion that model is issued is received,
The convexity deviation that model is issued changes the coefficient of each frame bending roller force：F1_P_B 、F2_P_B、F3_P_B、F4_P_
B, F5_P_B, F6_P_B, F7_P_B unit kn/pu；
This coefficient setting in the temperature of mm finishing mill unit entrance, thickness, width, material and each frame according to strip steel by model
Constant load is calculated；
4.3）Calculate unit bending roller force scalable coefficient；
Each frame allows maximum bending roller force：F1_Mx_B、F2_Mx_B、F3_Mx_B、F4_Mx_B、F5_Mx_B、F6_Mx_B、
F7_Mx_B units kn；
Each frame allows minimum bending roller force：F1_Min_B、F2_Min_B、F3_Min_B、F4_Min_B、F5_Min_B、F6_
Min_B, F7_Min_B unit kn；
Each frame roller value of feedback：F1_B_F, F2_B_F, F3_B_F, F4_B_F, F5_B_F, F6_B_F, F7_B_F are mono-
Position kn；
Each frame bending roller force scalable coefficient：F1_B_K、F2_B_K、F3_B_K、F4_B_K、F5_B_K、F6_B_K、F7_
B_K units pu；
F1_B_K=CLAMP ((Perr*F1_P_B),（F1_Mx_B-F1_B_F）、（F1_Min_B-F1_B_F））/
(Perr*F1_P_B)；
Annotation：CLAMP (A、B、C）Function means that A is input variable, and B is maximum, and C is minima, as C≤A
During≤B, function-output is A, and as A ＜ C, function-output is C, and as A ＞ B, function-output is B；
F2_B_K, F3_B_K, F4_B_K, F5_B_K, F6_B_K, F7_B_K are calculated in the same manner；
Unit bending roller force scalable coefficient：F_B_K units pu；
F_B_K=CLAMP (MIN (F1_B_K, F2_B_K, F3_B_K, F4_B_K, F5_B_K, F6_B_K, F7_B_K）、
1、0）；
Annotation：MIN（A、B、C、D.......）Function means the minima that output valve is A, B, C, D.......；
Calculate unit bending roller force scalable coefficient be in order to ensure strip profile closed loop control process in, the roller of each frame
Power is all adjustable, it is to avoid individual racks bending roller force occurs and reaches maximum or minima, and the phenomenon that can not be adjusted；
4.4）Setting convexity deviation changes the application factor of each frame bending roller force；
Convexity deviation changes application factor F1_P_B_K, F2_P_B_K, F3_P_B_K, F4_P_B_ of each frame bending roller force
K, F5_P_B_K, F6_P_B_K, F7_P_B_K unit pu；
Convexity deviation is changed the application factor of each frame bending roller force and is manually set by controllers, and its principle is：Before consideration
Section frame is the good key of afterbody plate shape in strip profile control and holding, therefore the coefficient of front end frame sets larger, rear end
The setting of frame coefficient is less, and its size must be between 0~1；The principle of so setting is：Before the Crown control of strip steel is mainly
Terminal frame, rear end frame is mainly used for controlling glacing flatness；And during belt steel rolling, particularly thin gauge strip, rolling
To afer bay, the thickness of strip steel is very thin, if the change of afer bay bending roller force is easily caused greatly belt plate shape mutation very much,
Cause steel scrap；
4.5）Calculate the bending roller force of each frame convexity deviation conversion；
The bending roller force of each frame convexity deviation conversion：F1_err、F2_err、F3_err、F4_err、F5_err、F6_err、
F7_err units kn；
F1_err=Perr*F1_P_B*F_B_K*F1_P_B_K；
F2_err, F3_err, F4_err, F5_err, F6_err, F7_err are calculated in the same manner；
4.6）Calculate each frame convexity closed loop bending roller force adjustment amount；
Each frame convexity closed loop bending roller force adjustment amount：F1_P_Cor、F2_P_Cor、F3_P_Cor、F4_P_Cor、F5_P_
Cor, F6_P_Cor, F7_P_Cor unit kn；
F1_P_Cor=F1_P_Cor+F1_err, annotation：Convexity closed loop bending roller force adjustment amount sum equation；
Strip profile closed loop control is：After strip steel exports profile gauge time delay 4 seconds by mm finishing mill unit, time delay is because for 4 seconds
Strip steel head easily rises floats unstable, and convexity detection is inaccurate, it is to avoid the regulation of mistake, the convexity that profile gauge detects strip steel is anti-
Feedback, calculates the bending roller force of the deviation and each frame convexity deviation conversion of strip profile, and in the operation of rolling afterwards, often
Every 2 seconds, periodically profile gauge of reading detected the crown feedback of strip steel, periodically calculated the deviation of strip profile
And the bending roller force of each frame convexity deviation conversion, so, the bending roller force of each frame convexity deviation conversion is to calculate one every 2 seconds
Secondary, each frame convexity closed loop bending roller force adjustment amount was accumulated once every 2 seconds, until each frame throws steel, the convexity of correspondence frame
Closed loop control terminates, and each frame convexity closed loop bending roller force adjustment amount is zeroed out；
F2_P_Cor, F3_P_Cor, F4_P_Cor, F5_P_Cor, F6_P_Cor, F7_P_Cor are calculated in the same manner.
Relative to prior art, advantages of the present invention is as follows, and the present invention develops a kind of strip profile closed loop control method,
In the mm finishing mill unit operation of rolling, according to the strip profile value of feedback of profile gauge detection, in real time, periodically calculate and set with convexity
The deviation of definite value, and the corresponding roller changed required for convexity deviation of each frame of finish rolling is calculated by a kind of specific algorithm
Power adjusted value, is constantly changing each frame bending roller force, so as to realize the closed loop control of strip profile；This invention technology with it is original
Technology is compared, and is changed strip profile and is unable to closed loop control, the defect of Crown control low precision, especially when production phosphorus content
Low, strip steel is organized in finish rolling leading portion frame and is put into ferrite area, and as middle base temperature is reduced, roll-force progressively subtracts on the contrary
It is little, and be to reduce bending roller force using former SM functions, the convexity that can make product reduces.By the theoretical application of Crown control and convex
Degree Closed loop Control is implemented, and the bending roller force for adjusting each frame come closed loop according to the deviation of strip profile is realized, so as to significantly
The Crown control precision of strip steel is improve, low-carbon (LC) and ultra-low-carbon steel, such as Automobile Plate, silicon steel high-end product matter can be especially met
Amount demand, the profit for enterprise provides technical guarantee.
Description of the drawings
Fig. 1 is Crown control flow chart of the present invention.
Specific embodiment
In order to deepen the understanding of the present invention and understanding, below in conjunction with the accompanying drawings the invention will be further described and introduces.
Embodiment 1：Referring to Fig. 1, a kind of hot rolled strip convexity line closed loop control method, to produce thickness Href=
2.5mm, as a example by the strip steel of convexity setting value Pref=20um：
1st, strip steel reaches mm finishing mill unit entrance, temperature, thickness, width, material, the reality of roll of finish rolling model foundation strip steel
When bending roller force setting value of the roll shape needed for calculate each frame of finish rolling.The roller setting value of F1~7 frame：850kn、670kn、
950kn、540kn、、640kn、、720kn、、814kn；
2nd, each frame of finish rolling is stung after steel, and the bending roller force of each frame is switched to the roller setting of finish rolling model calculating from equilibrant
Value；
The bending roller force of F1~7 frame is switched to roller setting value, the roller force feedback of each frame from stable equilibrium power 800kn
It is worth for setting value：F1_B_F=850kn, F2_B_F=670kn, F3_B_F=950kn, F4_B_F=540kn, F5_B_F=
640kn, F6_B_F=720kn, F7_B_F=814kn
3rd, in the mm finishing mill unit operation of rolling, plate shape keeps function to be carried out to bending roller force according to the change of the roll-force of each frame
Certain adjustment；
In the mm finishing mill unit operation of rolling, in the case where plate shape keeps function, the bending roller force of each frame is with frame roll-force
Change and change, roll-force increase, bending roller force increase, roll-force reduces bending roller force and reduces, i.e.,：Plate shape keeps function to bending roller force
Adjustment amount be with roll-force increase and increase, with roll-force reduce and reduce, it is not with strip profile value of feedback and target
The change of error of value and change, and bending roller force control strip profile theory be：Crown feedback value is less than desired value, needs to increase
Big bending roller force, crown feedback value is more than desired value, needs to reduce bending roller force, so, plate shape keeps adjustment of the function to bending roller force
Amount is present and the theoretical contrary situation of Crown control, here it is plate shape keeps the defect that function exists to Crown control.
4th, strip profile closed loop control：
4.1st, strip profile deviation is calculated：
Convexity sets FACTOR P ref_k=Pref/1000/ Href=20/1000/2.5=0.008
The strip profile value of feedback for detecting for the first time is：Pfbk=30um
Crown feedback FACTOR P fbk_k=Pfbk/1000/ Href=30/1000/2.5=0.012
Convexity deviation Perr=Pref_k-Pfbk_k=0.008-0.012=-0.004
4.2nd, the coefficient of each frame bending roller force of convexity deviation conversion that model is issued is received
Receive what model drew according to strip steel in the carry calculation of the temperature of finish rolling entrance, thickness, material and each frame
Convexity deviation changes the coefficient of each frame bending roller force（This coefficient is calculated by model, and the data of every piece of steel calculating are all different, herein
It is not explained in detail）：
F1_P_B=316821, F2_P_B=272216, F3_P_B=228111
F4_P_B=184563, F5_P_B=144704, F6_P_B=131925, F7_P_B=91849
4.3rd, unit bending roller force scalable coefficient is calculated
Each frame allows maximum bending roller force：F1_Mx_B=F2_Mx_B=F3_Mx_B=F4_Mx_B=F5_Mx_B=F6_
Mx_B=F7_Mx_B=2140kn
Each frame allows minimum bending roller force：F1_Min_B=F2_Min_B=F3_Min_B=F4_Min_B=F5_Min_
B, F6_Min_B=F7_Min_B=200kn
Each frame roller value of feedback：
F1_B_F=850kn, F2_B_F=670kn, F3_B_F=950kn
F4_B_F=540kn, F5_B_F=640kn, F6_B_F=720kn, F7_B_F=814kn
Each frame bending roller force scalable coefficient：
F1_B_K=CLAMP ((Perr*F1_P_B),（F1_Mx_B-F1_B_F）、（F1_Min_B-F1_B_F））/
(Perr*F1_P_B)
=CLAMP ((- 0.004*316821),（2140-850）、（200-850））/(-0.004*316821)
=CLAMP (- 1267.284,1290, -650）/(-1267.284)
=（-650）/(-1267.284)
=0.5129
Calculate in the same manner：
F2_B_K=0.4316、F3_B_K=0.8219、F4_B_K=0.4605
F5_B_K=0.7601, F6_B_K=0.9854, F7_B_K=1.6712
Unit bending roller force scalable coefficient：
F_B_K=CLAMP (MIN (F1_B_K, F2_B_K, F3_B_K, F4_B_K, F5_B_K, F6_B_K, F7_B_K）、
1、0）
=CLAMP (MIN (0.5129,0.4316,0.8219,0.4605,0.7601,0.9854,1.6712）、
1、0）
=CLAMP (0.4316,1,0）
=0.4316
4.4th, the application factor that convexity deviation changes each frame bending roller force is set
Convexity deviation changes the application factor of each frame bending roller force：
F1_P_B_K=0.85, F2_P_B_K=0.65, F3_P_B_K=0.55
F4_P_B_K=0.45, F5_P_B_K=0.35, F6_P_B_K=0.3, F7_P_B_K=0.25
4.5, calculate convexity deviation conversion each frame bending roller force：
Each frame bending roller force of convexity deviation conversion：
F1_err=Perr*F1_P_B*F_B_K*F1_P_B_K
=-0.004*316821*0.4316*0.85
=-464.9kN
Calculate in the same manner：
F2_err=-305.4kN, F3_err=-216.5kN, F4_err=-143.3kN
F5_err=-87.4kN, F6_err=-68.3kN, F7_err=-39.6kN
4.6, calculate each frame convexity closed loop bending roller force adjustment amount
Because this is to calculate each frame convexity closed loop bending roller force adjustment amount for the first time, thus F1_P_Cor, F2_P_Cor,
The initial value of F3_P_Cor, F4_P_Cor, F5_P_Cor, F6_P_Cor, F7_P_Cor is 0
F1_P_Cor=F1_P_Cor+F1_err
=0+-305.4
=-305.4kN
Calculate in the same manner：
F2_P_Cor=-305.4kN, F3_P_Cor=-216.5kN, F4_P_Cor=-143.3kN
F5_P_Cor=-87.4kN, F6_P_Cor=-68.3kN, F7_P_Cor=-39.6kN
The result of calculation of each frame bending roller force adjustment amount calculated according to above-mentioned convexity closed loop control draws：It is convex when strip steel
Degree is fed back to 30um, and during more than convexity desired value 20um, the bending roller force regulated quantity of F1 ~ 7 frame is all negative value；
In the same manner：According to bending roller force regulated quantity computing formula：Perr*F1_P_B*F_B_K*F1_P_B_K, when strip profile it is anti-
When feedback is less than convexity desired value, convexity deviation Perr be changed on the occasion of, and, convexity deviation that model is issued changes each frame bending roller force
Coefficient F1_P_B, unit bending roller force scalable coefficient F_B_K, convexity deviation change the application factor F1_ of each frame bending roller force
P_B_K all perseverances be on the occasion of, so, the bending roller force regulated quantity of F1 ~ 7 frame be also on the occasion of.
So, the adjustment amount of each frame bending roller force that convexity closed loop control is calculated meets what bending roller force was controlled strip profile
It is theoretical：Crown feedback value is less than desired value, needs to increase bending roller force, and crown feedback value is more than desired value, needs to reduce bending roller force.
And be according to convexity deviation be adjustment target.
It is separated by 2 seconds later, the strip profile value of feedback that convexity closed loop control is detected according to profile gauge at that time, more than repetition 1
~5 calculation procedure, calculates each frame bending roller force of convexity deviation conversion at that time, and is calculated according to the totalization formula of step 6
Each frame convexity closed loop bending roller force adjustment amount, until each frame throws steel, the convexity closed loop control of correspondence frame terminates, and to each machine
Frame convexity closed loop bending roller force adjustment amount is zeroed out, and waits and being recalculated during next piece of belt steel rolling.
It should be noted that above-described embodiment, not for limiting protection scope of the present invention, in above-mentioned technical proposal
On the basis of done equivalents or replacement each fall within the scope that the claims in the present invention are protected.
Claims (1)
1. a kind of hot rolled strip convexity line closed loop control method, it is characterised in that methods described step is as follows, 1）Strip steel is reached
Mm finishing mill unit entrance, the temperature of finish rolling model foundation strip steel, thickness, width, material, the real-time roll shape of roll are each to calculate finish rolling
Bending roller force setting value needed for frame；2）The each frame of finish rolling is stung after steel, and the bending roller force of each frame is switched to finish rolling mould from equilibrant
The roller setting value that type is calculated；3）In the mm finishing mill unit operation of rolling, plate shape keeps function to be changed according to the roll-force of each frame
Certain adjustment is carried out to bending roller force；4）Increase the closed loop control of strip profile, in the mm finishing mill unit operation of rolling, according to finish rolling
The strip profile value of feedback of outlet profile gauge real-time detection and the deviation of setting value, by a kind of convexity the calculation of bending roller force is changed
Method, calculates the adjusted value of bending roller force needed for each frame, and to the bending roller force of each frame of mm finishing mill unit real-time adjustment is carried out, and realizes band
The closed loop control of steel convexity；The step 4) in strip profile closed loop control concrete grammar it is as follows,
4.1）The deviation of strip profile is calculated,
The convexity setting value that model is issued：Pref units um；
The belt steel thickness setting value that model is issued：Href units mm；
Convexity sets coefficient：Pref_k units pu；
Pref_k=Pref/1000/ Href；
Crown feedback value：Pfbk units um；
Crown feedback coefficient：Pfbk_k units pu；
Pfbk_k=Pfbk/1000/ Href；
Convexity deviation：Perr units pu；
Perr=Pref_k-Pfbk_k；
4.2）The coefficient of each frame bending roller force of convexity deviation conversion that model is issued is received,
The convexity deviation that model is issued changes the coefficient of each frame bending roller force：F1_P_B 、F2_P_B、F3_P_B、F4_P_B、F5_
P_B, F6_P_B, F7_P_B unit kn/pu；
Setting of this coefficient by model according to strip steel in the temperature of mm finishing mill unit entrance, thickness, width, material and each frame is born
Lotus calculates；
4.3）Calculate unit bending roller force scalable coefficient；
Each frame allows maximum bending roller force：F1_Mx_B、F2_Mx_B、F3_Mx_B、F4_Mx_B、F5_Mx_B、F6_Mx_B、F7_
Mx_B units kn；
Each frame allows minimum bending roller force：F1_Min_B、F2_Min_B、F3_Min_B、F4_Min_B、F5_Min_B、F6_Min_
B, F7_Min_B unit kn；
Each frame roller value of feedback：F1_B_F, F2_B_F, F3_B_F, F4_B_F, F5_B_F, F6_B_F, F7_B_F unit kn；
Each frame bending roller force scalable coefficient：F1_B_K、F2_B_K、F3_B_K、F4_B_K、F5_B_K、F6_B_K、F7_B_K
Unit pu；
F1_B_K=CLAMP ((Perr*F1_P_B),（F1_Mx_B-F1_B_F）、（F1_Min_B-F1_B_F））/(Perr*
F1_P_B)；
Annotation：CLAMP (A、B、C）Function means that A is input variable, and B is maximum, and C is minima, as C≤A≤B
When, function-output is A, and as A ＜ C, function-output is C, and as A ＞ B, function-output is B；
F2_B_K, F3_B_K, F4_B_K, F5_B_K, F6_B_K, F7_B_K are calculated in the same manner；
Unit bending roller force scalable coefficient：F_B_K units pu；
F_B_K=CLAMP (MIN (F1_B_K, F2_B_K, F3_B_K, F4_B_K, F5_B_K, F6_B_K, F7_B_K）、1、
0）；
Annotation：MIN（A、B、C、D.......）Function means the minima that output valve is A, B, C, D.......；
Calculate unit bending roller force scalable coefficient be in order to ensure strip profile closed loop control process in, the bending roller force of each frame is all
It is adjustable, it is to avoid individual racks bending roller force occur and reach maximum or minima, and the phenomenon that can not be adjusted；
4.4）Setting convexity deviation changes the application factor of each frame bending roller force；
Convexity deviation changes application factor F1_P_B_K, F2_P_B_K, F3_P_B_K, F4_P_B_K, F5_ of each frame bending roller force
P_B_K, F6_P_B_K, F7_P_B_K unit pu；
Convexity deviation is changed the application factor of each frame bending roller force and is manually set by controllers, and its principle is：Consider leading portion machine
Frame is the good key of afterbody plate shape in strip profile control and holding, therefore the coefficient of front end frame sets larger, rear end frame
Coefficient setting is less, and its size must be between 0~1；The principle of so setting is：The Crown control of strip steel is mainly FEP
Frame, rear end frame is mainly used for controlling glacing flatness；And during belt steel rolling, particularly thin gauge strip, after being rolled down to
Frame, the thickness of strip steel is very thin, if the change of afer bay bending roller force is easily caused greatly belt plate shape mutation very much, causes
Steel scrap；
4.5）Calculate the bending roller force of each frame convexity deviation conversion；
The bending roller force of each frame convexity deviation conversion：F1_err、F2_err、F3_err、F4_err、F5_err、F6_err、F7_
Err units kn；
F1_err=Perr*F1_P_B*F_B_K*F1_P_B_K；
F2_err, F3_err, F4_err, F5_err, F6_err, F7_err are calculated in the same manner；
4.6）Calculate each frame convexity closed loop bending roller force adjustment amount；
Each frame convexity closed loop bending roller force adjustment amount：F1_P_Cor、F2_P_Cor、F3_P_Cor、F4_P_Cor、F5_P_Cor、
F6_P_Cor, F7_P_Cor unit kn；
F1_P_Cor=F1_P_Cor+F1_err, annotation：Convexity closed loop bending roller force adjustment amount sum equation；
Strip profile closed loop control is：After strip steel exports profile gauge time delay 4 seconds by mm finishing mill unit, profile gauge detects strip steel
Crown feedback, calculates the bending roller force of the deviation and each frame convexity deviation conversion of strip profile, and rolling afterwards
Cheng Zhong, every 2 seconds, periodically profile gauge of reading detected the crown feedback of strip steel, periodically calculated strip profile
Deviation and the conversion of each frame convexity deviation bending roller force, so, the bending roller force of each frame convexity deviation conversion is every 2 seconds
Calculate once, each frame convexity closed loop bending roller force adjustment amount was accumulated once every 2 seconds, until each frame throws steel, correspondence frame
Convexity closed loop control terminate, and each frame convexity closed loop bending roller force adjustment amount is zeroed out；
F2_P_Cor, F3_P_Cor, F4_P_Cor, F5_P_Cor, F6_P_Cor, F7_P_Cor are calculated in the same manner.
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| CN111229838B (en) * | 2018-11-28 | 2021-07-09 | 上海梅山钢铁股份有限公司 | Method for solving wave shape between frames through proportional convexity change coefficient |
| CN112007957B (en) * | 2019-05-30 | 2022-06-14 | 上海梅山钢铁股份有限公司 | Self-learning control method for comprehensive convexity compensation of hot-rolled finishing roll system |
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| CN110624959B (en) * | 2019-09-30 | 2021-04-27 | 攀钢集团西昌钢钒有限公司 | Leveling method for improving side bending defect of hot-rolled high-strength strip steel |
| CN111250551B (en) * | 2020-01-15 | 2022-03-18 | 首钢京唐钢铁联合有限责任公司 | Method and system for controlling bending force of finishing machine |
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