CN102688897A - Control method of edge portion strip shape of cold rolling strip steel - Google Patents
Control method of edge portion strip shape of cold rolling strip steel Download PDFInfo
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Abstract
The invention relates to a rolling method of cold rolling strip steel, in particular to a control method of edge portion strip shape of thin strip steel rolled by a cold continuous rolling mill or a two-stand temper mill. In a strip shape feedback control system centered on a last stand and on the basis of fundamental strip shape control function of major control for conventional edge waves and center waves, the method identifies the state of the edge portion strip shape of the strip steel based on the difference between the actual measured strip shape of strip steel edge portion together with the adjacent areas at the exit of last stand and an objective strip shape, and adjusts the corresponding strip shape executive mechanisms of the last stand and the rest stands according to the state of the edge portion strip shape to realize effective control for the edge portion strip shape of the strip steel, such as small edge waves and small side waves, thereby further improving the quality of the strip steel after cold rolling or temper rolling.
Description
Technical field
The present invention relates to a kind of milling method of cold-strip steel, more particularly to cold continuous rolling or Two-stand Temper Mill rolls the control method of Thin Strip Steel Edge shape.
Background technology
During cold rolling or smooth Thin Strip Steel（Particularly thickness≤0.3mm paper-thin strip）, when strip one side or local deformation amount in both sides of the edge bigger than normal compared with edge close region, in the wide appearance wave height easy into narrower range of band steel edge and unrestrained unrestrained away from smaller local openings side, i.e., small side wave, also referred to as broken side wave etc.；When strip is unilateral or two side portion close region local deformation amounts are bigger than normal compared with edge, easily occur that wave is high into narrower range and wave is remained silent side wave away from smaller part steel edge portion close region is wide, i.e., it is small partially unrestrained.The unrestrained and small wave partially in small side is referred to as Edge shape herein, as shown in Figure 1.
With the wide side to large area of strip on conventional meaning is unrestrained, compared with middle wave, small side is unrestrained, small wave partially not only has notable difference in display form（Unrestrained height, wave are wide narrow to region away from small, waviness）, and be not easily controlled, it is one of difficult point during ultrathin cold-rolled belt plate shape is controlled.
In existing cold-strip steel Edge shape control technology, the Edge shape control method of FDAC electric corporation HC series cold-rolling mill shape control systems is representative.First, target flatness value is subtracted with the actual measurement plate shape value of last rack outlet steel edge portion plate profile instrument passage, obtains Edge shape deviation, circular is as shown in Figure 2.Secondly, steel edge portion plate shape state is judged according to Edge shape deviation：When Edge shape deviation is more than the given upper limit, it is believed that steel edge portion is local partially loose；When Edge shape deviation is less than given lower limit, it is believed that steel edge portion is locally tight slightly.Finally, according to the corresponding plate shape executing agency of steel edge portion plate shape status adjustment to eliminate Edge shape deviation：When steel edge portion is partially loose, the harmful contact area between axial float end frame working roll or intermediate calender rolls reduction roll, to reduce the deflection of last frame steel edge portion, at the same time, passes through remaining frame of play in addition to last frame（Hereinafter referred to as upstream stand）Harmful contact area between working roll or intermediate calender rolls increase roll, reduces upstream stand work roll bending power and intermediate calender rolls bending roller force, to increase the deflection of upstream stand steel edge portion；Otherwise, when steel edge portion is tight slightly, harmful contact area between axial float end frame working roll or intermediate calender rolls increase roll, to increase the deflection of last frame steel edge portion, at the same time, reduce the harmful contact area between roll, increase upstream stand work roll bending power and intermediate calender rolls bending roller force by play upstream stand working roll or intermediate calender rolls, to reduce the deflection of upstream stand steel edge portion.
The above method has following weak point：（1）The plate shape deviation that target flatness is worth to directly is subtracted with steel edge portion actual measurement plate shape value, steel edge portion plate shape state can not be accurately reflected, can not particularly reflect whether edge close region occurs small partially unrestrained.（2）Due to upstream stand strip, to run to the last rack outlet plate profile instrument time longer, correspondingly causes that flatness detection delay is longer, and roll axial float response speed is slower in addition, and Edge shape controlling cycle can only be long.This means the strip passed through in a controlling cycle is longer.Only target flatness value is subtracted with the instantaneous edge actual measurement plate shape value of a certain moment in current control period, it is impossible to intactly reflect the situation of change of steel edge portion plate shape along its length in same controlling cycle.（3）Although the response speed of work roll bending and middle roll bending is far faster than the response speed of roll axial float, both use identical controlling cycle, it is impossible to play the advantage of roller control response rapidity.
The content of the invention
It is an object of the invention to provide a kind of cold-strip steel Edge shape control method, the control method is in the plate shape feedback control system attached most importance to last frame, effective control to the unrestrained and small wave partially in for example small side of steel edge portion plate shape etc., can further improve the strip shape quality of cold rolling or smooth rear strip.
To achieve these goals, the present invention is adopted the following technical scheme that：
A kind of cold-strip steel Edge shape control method, in the plate shape feedback control system attached most importance to last frame, on the basis of the basic Strip Shape Control function of major control normal edge wave and middle wave, the difference for surveying plate shape and target flatness based on last rack outlet steel edge portion and close region identifies steel edge portion plate shape state, according to the last frame of Edge shape status adjustment and remaining each corresponding plate shape executing agency of frame, the control of unrestrained to for example small side of steel edge portion plate shape and small wave partially is realized；Its step is：
（1）Determine the steel edge portion Strip Shape Control cycle
Edge shape controlling cycle is comprehensively determined according to the maximum execution time and the detection sampling period of plate profile instrument that strip is run to required for the maximum duration needed at last rack outlet plate profile instrument, roll axial float perform single step displacement from first frame roll gapT ES_control ；
（2）Judge current control periodkWhether the moment reachesIf do not reached, wait；If reached, start to perform current control period；
（3）Each mill stand control model parameter, including gain coefficient, influence coefficient and weight coefficient, actual measurement plate shape and target flatness value are read respectively；
（4）Weighted filtering is carried out along along strip length direction to actual measurement plate shape
In a controlling cycle, in each Measurement channel position of plate profile instrumentxPlace（Strip is wide to place normalization coordinate）Have along along strip length directionnIndividual actual measurement plate shape valuee meas （x,i）,i=1,2 ...,n；WhereinnIt is equal toT ES_control WithT S_meas Ratio rounds modulus, i.e.,
To actual measurement plate shape valuee meas （x,i）Filtering is weighted, i.e.,
（5）Determine steel edge portion plate shape deviation
Steel edge portion plate shape deviation is calculated as follows：
（6）Recognize steel edge portion plate shape state
The strip both sides Edge shape deviation D obtained according to calculatinge ES_ds 、De ES_ws , by method identified below, steel edge portion plate shape state is judged：
When
When, strip transmission side Edge shape is partially loose, and transmission side is likely to occur small side wave；
When
When, strip fore side Edge shape is partially loose, and fore side is likely to occur small side wave；
When
When, strip transmission side Edge shape is tight slightly, and transmission side is likely to occur small partially unrestrained；
WhenWhen, strip fore side Edge shape is tight slightly, and fore side is likely to occur small partially unrestrained.
Wherein：De ES_upp --- steel edge portion plate shape deviation allowable upper limit value, De ES_upp > 0
De ES_low --- steel edge portion plate shape deviation allows lower limit, De ES_low < 0 ；
（7）Determine the feedback control compensation value of plate shape executing agency
According to strip both sides Edge shape state, the feedback control compensation value for determining each frame working roll roll shifting, intermediate roll shifting, work roll bending and middle roll bending respective plate shape executing agency is calculated respectively；
（8）Limit check, output feedback ontrol offset；Current control period terminates；
（9）Take current periodkFork +T ES_control , go to step（2）, repeat step（2）To step（8）.
The present invention is in the plate shape feedback control system attached most importance to last frame, on the basis of the basic Strip Shape Control function mainly for normal edge wave and middle wave etc., the difference for surveying plate shape and target flatness based on last rack outlet steel edge portion and close region identifies steel edge portion plate shape state, according to the last frame of Edge shape status adjustment and the corresponding plate shape executing agency of upstream stand, effective control to the unrestrained and small wave partially in for example small side of steel edge portion plate shape etc. is realized, the strip shape quality of cold rolling or smooth rear strip can be further improved.
Brief description of the drawings
Fig. 1 is Edge shape schematic diagram, wherein：The unilateral small side waves of a, the bilateral small side waves of b, c is unilateral small partially unrestrained, and d is bilateral small partially unrestrained；
Fig. 2 is that existing plate shape deviation calculates schematic diagram；
Fig. 3 is roll roll shifting mode Edge shape control flow chart of the invention；
Fig. 4 is roll roller mode Edge shape control flow chart of the invention；
Fig. 5 is Two-stand Temper Mill steel edge portion Strip Shape Control principle schematic.
Embodiment
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings.
Referring to Fig. 3, Fig. 4, a kind of cold-strip steel Edge shape control method, its step is：
（1）Determine the steel edge portion Strip Shape Control cycle
In order to ensure the stability of Edge shape controlling unit, according to strip from the first frame in upstream（That is 1# frames）Roll gap runs to the maximum duration needed at last rack outlet plate profile instrument i.e. flatness detection maximum delay timeT M_delay , the maximum execution time required for the execution single step displacement of roll axial floatT R_shift , and plate profile instrument the detection sampling periodT S_meas , it is comprehensive by the following method to determine roll shifting mode Edge shape controlling cycle for roll axial float mode controls steel edge portion plate shapeT ES_control =
, i.e., should take
It is more than or equal toT M_delay 、T R_shift 、T S_meas Maximum among three：
（1）
For roll roller mode controls steel edge portion plate shape, because the execution response time of roll roller is very short, generally much smaller thanT M_delay WithT S_meas , it is comprehensive by the following method to determine roller mode Edge shape controlling cycleT ES_control =
, that is, take
It is more than or equal toT M_delay 、T S_meas Maximum among the two：
For having the milling train of roll roller and roll axial float simultaneously, it is contemplated that the execution response speed of roll roller is general far faster than roll axial float, according to formula（1）With（2）, Ke Yiqu
, i.e., when carrying out belt plate shape control, take roll roller mode Edge shape controlling cycle to be less than roll shifting mode Edge shape controlling cycle, the advantage that roll roller is performed into fast response time gives full play of.
（2）Judge current control periodkWhether the moment reachesIf do not reached, wait；If reached, start to perform current control period；
（3）Each mill stand control model parameter, including gain coefficient, influence coefficient and weight coefficient, actual measurement plate shape and target flatness value are read respectively；
（4）Weighted filtering is carried out along along strip length direction to actual measurement plate shape
Usually, Edge shape controlling cycleT ES_control It is far longer than the sampling period of actual measurement plate shapeT S_meas , i.e., in a controlling cycle, in each Measurement channel position of plate profile instrumentxPlace（Strip is wide to place normalization coordinate）Have along along strip length directionnIndividual actual measurement plate shape valuee meas （x,i）,i=1,2 ...,n.WhereinnIt is equal toT ES_control WithT S_meas Ratio rounds modulus, i.e.,
In formula： T ES_control ——Edge shape controlling cycle,
T S_meas --- the detection sampling period of plate profile instrument,
In order to intactly reflect the changing rule of steel edge portion plate shape along its length in same controlling cycle, to actual measurement plate shape valuee meas （x,i）Filtering is weighted, i.e.,
In formulaa（i）--- filtration combined weighted coefficient, it can typically takea（i）=i
x --- strip is wide to place normalization coordinate value,
。
（5）Determine steel edge portion plate shape deviation
According to the mechanism of production of Edge shape defect, in order to reflect steel edge portion plate shape state exactly, while in order to realize the decoupling between basic Strip Shape Control and Edge shape control, considering steel edge portionx e ,-x e Place and edge close regionx q ,-x q The actual measurement plate shape value at placee meas （±x e ）、e meas （±x q ）With target flatness valuee ref （±x e ）、e ref （±x q ）, the method for being calculated as follows determines steel edge portion plate shape deviation：
D in formulae ES_ds --- transmission side Edge shape deviation
De ES_ws --- fore side Edge shape deviation
+x e --- transmission side steel edge portion is wide to place normalization coordinate value, can typically takex e =1.0~
+x q --- transmission side steel edge portion close region is wide to place normalization coordinate value, can typically takex q =
~
-x e --- fore side steel edge portion is wide to place normalization coordinate value
-x q --- fore side steel edge portion close region is wide to place normalization coordinate value
e meas (+x e ) --- transmission side portion actual measurement plate shape value after filtering
e meas (-x e ) --- operation side portion actual measurement plate shape value after filtering
e meas (+x q ) --- transmission side portion close region actual measurement plate shape value after filtering
e meas (-x q ) --- operation side portion close region actual measurement plate shape value after filtering
e ref (+x e ) --- transmission side portion target flatness value
e ref (-x e ) --- operation side portion target flatness value
e ref (+x q ) --- transmission side portion close region target flatness value
e ref (-x q ) --- operation side portion close region target flatness value.
（6）Recognize steel edge portion plate shape state
The strip both sides Edge shape deviation D obtained according to calculatinge ES_ds 、De ES_ws , by method identified below, steel edge portion plate shape state is judged：
When
When, strip transmission side Edge shape is partially loose, and transmission side is likely to occur small side wave；
When
When, strip fore side Edge shape is partially loose, and fore side is likely to occur small side wave；
When
When, strip transmission side Edge shape is tight slightly, and transmission side is likely to occur small partially unrestrained；
When
When, strip fore side Edge shape is tight slightly, and fore side is likely to occur small partially unrestrained.
Wherein, De ES_upp --- steel edge portion plate shape deviation allowable upper limit value, De ES_upp > 0
De ES_upp --- steel edge portion plate shape deviation allows lower limit, De ES_upp < 0 。
（7）Determine the feedback control compensation value of plate shape executing agency
According to strip both sides Edge shape state, respectively by following control strategy and computation model, the feedback control compensation value for determining corresponding plate shape executing agency is calculated.
（7.1）Working roll axial float compensation value calculation
For the milling train with working roll long stroke axial float function, such as HCW, HCMW, UCMW milling train, working roll axial float compensation value calculation method is as follows.
For last frame, when strip transmission side Edge shape is partially loose or tight slightly, then top working roll axial float offset is calculated as follows：
Otherwise
For last frame, when strip fore side Edge shape is partially loose or tight slightly, then bottom working roll axial float offset is calculated as follows：
Otherwise
In formula--- last frame top working roll axial float feedback control compensation value
For each frame of upstream, when strip transmission side Edge shape is partially loose or tight slightly, then top working roll axial float offset is calculated as follows：
Otherwise
For each frame of upstream, when strip fore side Edge shape is partially loose or tight slightly, then bottom working roll axial float offset is calculated as follows：
Otherwise
In formulaj--- represent upstream thejFrame,j=1,2 ...
（7.2）Intermediate calender rolls axial float compensation value calculation
For no working roll long stroke axial float function, the only milling train with intermediate calender rolls long stroke axial float function, such as HCM, UCM milling train, intermediate calender rolls axial float compensation value calculation method is as follows.
For last frame, when strip transmission side Edge shape is partially loose or tight slightly, then upper intermediate calender rolls axial float offset is calculated as follows：
Otherwise
For last frame, when strip fore side Edge shape is partially loose or tight slightly, then intermediate calender rolls axial float offset is descended to be calculated as follows：
Otherwise
In formula--- intermediate calender rolls axial float feedback control compensation value in last frame
--- last frame intermediate calender rolls axial float feedback control gain
For each frame of upstream, when strip transmission side Edge shape is partially loose or tight slightly, then upper intermediate calender rolls axial float offset is calculated as follows：
Otherwise
For each frame of upstream, when strip fore side Edge shape is partially loose or tight slightly, then intermediate calender rolls axial float offset is descended to be calculated as follows：
Otherwise
In formulaj--- represent upstream thejFrame,j=1,2 ...
--- thejIntermediate calender rolls axial float feedback control compensation value in frame
--- thejIntermediate calender rolls axial float feedback control compensation value under frame
（7.3）Work roll bending force compensating value is calculated
There is the milling train of the symmetrical roller function of working roll for each frame of upstream, when strip transmission side and simultaneously partially loose or simultaneously tight slightly fore side Edge shape, then the offset of work roll bending power is calculated as follows respectively：
Otherwise
In formulaj--- represent upstream thejFrame,j=1,2 ...
--- thejFrame work roll bending feedback control gain
There is the milling train of the asymmetric roller function of working roll for each frame of upstream, when strip transmission side Edge shape is partially loose or tight slightly, then the offset of transmission side work roll bending power is calculated as follows respectively：
Otherwise
In formulaj--- represent upstream thejFrame,j=1,2 ...
There is the milling train of the asymmetric roller function of working roll for each frame of upstream, when strip fore side Edge shape is partially loose or tight slightly, then the offset of fore side work roll bending power is calculated as follows respectively：
Otherwise
In formulaj--- represent upstream thejFrame,j=1,2 ...
--- thejGantry operation side work roll bending feedback control compensation value.
（7.4）Intermediate calender rolls corner flowt value is calculated
There is the milling train of the symmetrical roller function of intermediate calender rolls for each frame of upstream, when strip transmission side and simultaneously partially loose or simultaneously tight slightly fore side Edge shape, then the offset of intermediate calender rolls bending roller force is calculated as follows respectively：
Otherwise
In formulaj--- represent upstream thejFrame,j=1,2 ...
--- thejRoll bending influences coefficient to steel edge portion plate shape in the middle of frame.
There is the milling train of the asymmetric roller function of intermediate calender rolls for each frame of upstream, when strip transmission side Edge shape is partially loose or tight slightly, then the offset of transmission side intermediate calender rolls bending roller force is calculated as follows respectively：
Otherwise
In formulaj--- represent upstream thejFrame,j=1,2 ...
There is the milling train of the asymmetric roller function of intermediate calender rolls for each frame of upstream, when strip fore side Edge shape is partially loose or tight slightly, then the offset of fore side intermediate calender rolls bending roller force is calculated as follows respectively：
Otherwise
In formulaj--- represent upstream thejFrame,j=1,2 ...
（8）Limit check, output feedback ontrol offset；Current control period terminates；
（9）Take current periodkFork +T ES_control , go to step（2）, repeat step（2）To step（8）.
Control the control method and flow of steel edge portion plate shape as shown in Figure 3 by roll axial float mode；Control the control method and flow of steel edge portion plate shape as shown in Figure 4 by roll roller mode.
Embodiment
By taking the roller UCM planishers of Stand Mill six as an example, to the present invention steel edge portion board-shape control method implementation process carry out remark additionally it is as follows.
As shown in figure 5, equipment composition relevant with the present invention in the roller UCM planishers of Stand Mill six includes：
1）1st frame planisher has upper and lower working roll, upper and lower intermediate calender rolls, upper and lower support roller, for controlling plate shape executing agencies such as the axial long stroke roll shifting of the roller declination of this rack outlet belt plate shape, the symmetrical roller of working roll, the symmetrical roller of intermediate calender rolls and intermediate calender rolls etc..
2）2nd frame planisher has upper and lower working roll, upper and lower intermediate calender rolls, upper and lower support roller, for controlling plate shape executing agencies such as the axial long stroke roll shifting of the roller declination of this rack outlet belt plate shape, the symmetrical roller of working roll, the symmetrical roller of intermediate calender rolls and intermediate calender rolls etc..
3）Plate profile instrument for detecting the 2nd rack outlet belt plate shape etc..
In the present embodiment, the 1st frame and the 2nd intermediate roll shifting only carry out coiling temperature setup, be not involved in basic Strip Shape Control and the Edge shape control of closed-loop dynamic adjustment, steel edge portion plate shape is controlled by the 1st frame work roll bending and middle roll bending here.
As shown in figure 5, the Two-stand Temper Mill Strip Shape Control function is made up of Edge shape control function and basic Strip Shape Control function two parts.Wherein, mainly the flatness defect such as unilateral unrestrained, bilateral wave and middle wave to large area wide to strip on conventional meaning is controlled basic Strip Shape Control function, i.e.,：According to the symmetrical components of difference between actual measurement plate shape value and target flatness value, the 2nd frame work roll bending power, intermediate calender rolls bending roller force setting value are adjusted in real time；According to the asymmetry part of difference between actual measurement plate shape value and target flatness value, the 2nd frame roller declination setting value is adjusted in real time, so as to reach the purpose for eliminating plate shape deviation.Edge shape control function is mainly controlled to edge flatness defects such as unrestrained, the small waves partially in small side of steel edge portion and its close region.
With reference to Fig. 4, emphasis is described as follows to the implementation process of edge Strip Shape Control function：
1）Determine Edge shape controlling cycle
The present embodiment controls steel edge portion plate shape by the 1st breast roller roller mode.If the maximum time that strip is run at plate profile instrument from the 1st frame roll gapT M_delay =2.4s, the measurement of plate profile instrument uses the cycleT S_meas =0.3s, then Edge shape control controlling cycle
It should be greater than or equal to 2.4s, take here
=3.0s.
2）Judge current control periodkWhether the moment reachesIf do not reached, wait；If reached, start to perform current control period.
3）The 1st frame and the 2nd mill stand control model parameter, including gain coefficient, influence coefficient and weight coefficient are read respectively, survey plate shape and target flatness value etc..
4）Weighted filtering is carried out along along strip length direction to actual measurement plate shape
Illustrate in an Edge shape controlling cycle, in each Measurement channel position of plate profile instrumentxPlace（Strip is wide to place normalization coordinate）There are 10 actual measurement plate shape values along along strip length directione meas （x,i）,i=1,2 ..., 10.To actual measurement plate shape valuee meas （x,i）Filtering is weighted, i.e.,
In formulaa（i）--- filtration combined weighted coefficient, take herea（i）=i
x --- strip is wide to place normalization coordinate value,
。
5）Determine steel edge portion plate shape deviation
Here steel edge portion position is takenx e =1.0, edge close region positionx q =
, then calculate and obtain steel edge portion plate shape deviation：
D in formulae ES_ds --- transmission side Edge shape deviation
De ES_ws --- fore side Edge shape deviation
e meas (1.0) --- transmission side portion actual measurement plate shape value after filtering
e meas (- 1.0) --- operation side portion actual measurement plate shape value after filtering
e meas (
) --- transmission side portion close region actual measurement plate shape value after filtering
e meas (-
) --- operation side portion close region actual measurement plate shape value after filtering
e ref (1.0) --- transmission side portion target flatness value
e ref (- 1.0) --- operation side portion target flatness value
e ref (
) --- transmission side portion close region target flatness value
e ref (-
) --- operation side portion close region target flatness value.
6）Recognize steel edge portion plate shape state
The strip both sides Edge shape deviation D obtained according to calculatinge ES_ds 、De ES_ws , by method identified below, steel edge portion plate shape state is judged：
WhenWhen, strip transmission side Edge shape is partially loose, and transmission side is likely to occur small side wave；
When
When, strip fore side Edge shape is partially loose, and fore side is likely to occur small side wave；
When
When, strip transmission side Edge shape is tight slightly, and transmission side is likely to occur small partially unrestrained；
When
When, strip fore side Edge shape is tight slightly, and fore side is likely to occur small partially unrestrained；
Wherein, De ES_upp --- steel edge portion plate shape deviation allowable upper limit value, D is taken heree ES_upp =6 I-unit
De ES_upp --- steel edge portion plate shape deviation allows lower limit, and D is taken heree ES_upp =-4 I-unit.
7）Determine the feedback control compensation value of the 1st frame bending roller force
7.1）1st frame work roll bending force compensating value is calculated
Because the 1st frame has the symmetrical roller function of working roll, when strip transmission side and fore side Edge shape are simultaneously partially loose or simultaneously tight slightly, then calculate obtain work roll bending power offset it is as follows：
Otherwise
In formula
--- the 1st frame work roll bending feedback control compensation value
7.2）Intermediate calender rolls corner flowt value is calculated
Because the 1st frame has the symmetrical roller function of intermediate calender rolls, when strip transmission side and simultaneously partially loose or simultaneously tight slightly fore side Edge shape, then the offset of intermediate calender rolls bending roller force is calculated as follows respectively：
Otherwise
In formula
--- roll bending feedback control compensation value in the middle of the 1st frame
8）After limit check, the 1st frame work roll bending and middle roll bending feedback control compensation value are exported respectively
、
.Current control period terminates.
9）Take current periodkFork +
, go to step 2）, repeat step 2）To step 8）.
The cold-strip steel Edge shape control method of the present invention is effective control to the unrestrained and small wave partially in for example small side of steel edge portion plate shape etc. in the plate shape feedback control system attached most importance to last frame, further to improve the strip shape quality of cold rolling or smooth rear strip.
Technical scheme applied to certain high speed paper-thin strip Two-stand Temper Mill plat control system in, practice have shown that, can improve obviously it is smooth after steel edge portion strip shape quality.
Presently preferred embodiments of the present invention is these are only, is not intended to limit the scope of the present invention, therefore, any modifications, equivalent substitutions and improvements made within the spirit and principles of the invention etc. should be included within the scope of the present invention.
Claims (8)
1. a kind of cold-strip steel Edge shape control method, in the plate shape feedback control system attached most importance to last frame, on the basis of the basic Strip Shape Control function of major control normal edge wave and middle wave, it is characterized in that：The difference for surveying plate shape and target flatness based on last rack outlet steel edge portion and close region identifies steel edge portion plate shape state, according to the last frame of Edge shape status adjustment and remaining each corresponding plate shape executing agency of frame, the control of unrestrained to for example small side of steel edge portion plate shape and small wave partially is realized；Follow these steps to carry out：
（1）Determine the steel edge portion Strip Shape Control cycle
Edge shape controlling cycle is comprehensively determined according to the maximum execution time and the detection sampling period of plate profile instrument that strip is run to required for the maximum duration needed at last rack outlet plate profile instrument, roll axial float perform single step displacement from first frame roll gapT ES_control ；
（2）Judge current control periodkWhether the moment reachesIf do not reached, wait；If reached, start to perform current control period；
（3）Each mill stand control model parameter, including gain coefficient, influence coefficient and weight coefficient, actual measurement plate shape and target flatness value are read respectively；
（4）Weighted filtering is carried out along along strip length direction to actual measurement plate shape
In a controlling cycle, in each Measurement channel position of plate profile instrumentxPlace（Strip is wide to place normalization coordinate）Have along along strip length directionnIndividual actual measurement plate shape valuee meas （x,i）,i=1,2 ...,n；WhereinnIt is equal toT ES_control WithT S_meas Ratio rounds modulus, i.e.,
In formula： T ES_control ——Edge shape controlling cycle,
T S_meas --- the detection sampling period of plate profile instrument,
To actual measurement plate shape valuee meas （x,i）Filtering is weighted, i.e.,
In formula：a（i）--- filtration combined weighted coefficient, it can typically takea（i）=i
x --- strip is wide to place normalization coordinate value,；
（5）Determine steel edge portion plate shape deviation
Steel edge portion plate shape deviation is calculated as follows：
D in formulae ES_ds --- transmission side Edge shape deviation
De ES_ws --- fore side Edge shape deviation
+x e --- transmission side steel edge portion is wide to place normalization coordinate value, can typically takex e =1.0~
+x q --- transmission side steel edge portion close region is wide to place normalization coordinate value, can typically takex q =
~
-x e --- fore side steel edge portion is wide to place normalization coordinate value
-x q --- fore side steel edge portion close region is wide to place normalization coordinate value
e meas (+x e ) --- transmission side portion actual measurement plate shape value after filtering
e meas (-x e ) --- operation side portion actual measurement plate shape value after filtering
e meas (+x q ) --- transmission side portion close region actual measurement plate shape value after filtering
e meas (-x q ) --- operation side portion close region actual measurement plate shape value after filtering
e ref (+x e ) --- transmission side portion target flatness value
e ref (-x e ) --- operation side portion target flatness value
e ref (+x q ) --- transmission side portion close region target flatness value
e ref (-x q ) --- operation side portion close region target flatness value；
（6）Recognize steel edge portion plate shape state
The strip both sides Edge shape deviation D obtained according to calculatinge ES_ds 、De ES_ws , by method identified below, steel edge portion plate shape state is judged：
When
When, strip transmission side Edge shape is partially loose, and transmission side is likely to occur small side wave；
When
When, strip fore side Edge shape is partially loose, and fore side is likely to occur small side wave；
WhenWhen, strip transmission side Edge shape is tight slightly, and transmission side is likely to occur small partially unrestrained；
When
When, strip fore side Edge shape is tight slightly, and fore side is likely to occur small partially unrestrained；
Wherein, De ES_upp --- steel edge portion plate shape deviation allowable upper limit value, De ES_upp > 0
De ES_low --- steel edge portion plate shape deviation allows lower limit, De ES_low < 0 ；
（7）Determine the feedback control compensation value of plate shape executing agency
According to strip both sides Edge shape state, distribution calculates the feedback control compensation value for determining each frame working roll roll shifting, intermediate roll shifting, work roll bending and middle roll bending respective plate shape executing agency；
（8）Limit check, output feedback ontrol offset；Current control period terminates；
（9）Take current periodkFork +T ES_control , go to step（2）, repeat step（2）To step（8）.
2. cold-strip steel Edge shape control method according to claim 1, it is characterized in that：The step（1）The determination steel edge portion Strip Shape Control cycleT ES_control , for roll axial float mode controls steel edge portion plate shape, roll shifting mode Edge shape controlling cycle is determined by the following methodT ES_control =
, that is, take
It is more than or equal toT M_delay 、T R_shift 、T S_meas Maximum among three：
For roll roller mode controls steel edge portion plate shape, the controlling cycle of roller mode Edge shape control is determined by the following methodT ES_control =
, that is, take
It is more than or equal toT M_delay 、T S_meas Maximum among the two：
In formula：
--- roll shifting mode Edge shape controlling cycle,
T M_delay --- strip runs to the maximum duration needed at last rack outlet plate profile instrument, i.e. flatness detection maximum delay time from the first frame roll gap in upstream,
T R_shift --- roll axial float performs the maximum execution time required for single step displacement,
T S_meas --- the detection sampling period of plate profile instrument.
3. cold-strip steel Edge shape control method according to claim 1, it is characterized in that：For the milling train with working roll long stroke axial float function, the step（7）Plate shape executing agency working roll axial float compensation value calculation it is as follows：
For last frame, when strip transmission side Edge shape is partially loose or tight slightly, then top working roll axial float offset is calculated as follows：
Otherwise
For last frame, when strip fore side Edge shape is partially loose or tight slightly, then bottom working roll axial float offset is calculated as follows：
Otherwise
In formula --- last frame top working roll axial float feedback control compensation value
--- last frame bottom working roll axial float feedback control compensation value
For each frame of remaining in addition to last frame, when strip transmission side Edge shape is partially loose or tight slightly, then top working roll axial float offset is calculated as follows：
Otherwise
For each frame of remaining in addition to last frame, when strip fore side Edge shape is partially loose or tight slightly, then bottom working roll axial float offset is calculated as follows：
Otherwise
In formulaj --- represent upstream thejFrame,j=1,2 ...
--- thejFrame top working roll axial float feedback control compensation value
--- thejFrame working roll axial float influences coefficient to steel edge portion plate shape.
4. cold-strip steel Edge shape control method according to claim 1, it is characterized in that：For no working roll long stroke axial float function, the only milling train with intermediate calender rolls long stroke axial float function, the step（7）Plate shape executing agency intermediate calender rolls axial float compensation value calculation it is as follows：
For last frame, when strip transmission side Edge shape is partially loose or tight slightly, then upper intermediate calender rolls axial float offset is calculated as follows：
Otherwise
For last frame, when strip fore side Edge shape is partially loose or tight slightly, then intermediate calender rolls axial float offset is descended to be calculated as follows：
Otherwise
In formula
--- intermediate calender rolls axial float feedback control compensation value in last frame
--- last frame intermediate calender rolls axial float influences coefficient to steel edge portion plate shape
For each frame of remaining in addition to last frame, when strip transmission side Edge shape is partially loose or tight slightly, then upper intermediate calender rolls axial float offset is calculated as follows：
Otherwise
For each frame of remaining in addition to last frame, when strip fore side Edge shape is partially loose or tight slightly, then intermediate calender rolls axial float offset is descended to be calculated as follows：
Otherwise
In formulaj --- represent upstream thejFrame,j=1,2 ...
--- thejFrame intermediate calender rolls axial float influences coefficient to steel edge portion plate shape.
5. cold-strip steel Edge shape control method according to claim 1, it is characterized in that：For the milling train with the symmetrical roller function of working roll, the step（7）Plate shape executing agency work roll bending force compensating value be calculated as follows：
For each frame of remaining in addition to last frame, when strip transmission side and simultaneously partially loose or simultaneously tight slightly fore side Edge shape, then the offset of work roll bending power is calculated as follows respectively：
Otherwise
In formulaj --- represent upstream thejFrame,j=1,2 ...
6. cold-strip steel Edge shape control method according to claim 1, it is characterized in that：For the milling train with the asymmetric roller function of working roll, the step（7）Plate shape executing agency work roll bending force compensating value be calculated as follows：
For each frame of remaining in addition to last frame, when strip transmission side Edge shape is partially loose or tight slightly, then the offset of transmission side work roll bending power is calculated as follows respectively：
Otherwise
In formulaj --- represent upstream thejFrame,j=1,2 ...
For each frame of remaining in addition to last frame, when strip fore side Edge shape is partially loose or tight slightly, then the offset of fore side work roll bending power is calculated as follows respectively：
Otherwise
In formulaj --- represent upstream thejFrame,j=1,2 ...
7. cold-strip steel Edge shape control method according to claim 1, it is characterized in that：For the milling train with the symmetrical roller function of intermediate calender rolls, the step（7）Plate shape executing agency intermediate calender rolls corner flowt value be calculated as follows：
For each frame of remaining in addition to last frame, when strip transmission side and simultaneously partially loose or simultaneously tight slightly fore side Edge shape, then the offset of intermediate calender rolls bending roller force is calculated as follows respectively：
Otherwise
In formulaj --- represent upstream thejFrame,j=1,2 ...
8. cold-strip steel Edge shape control method according to claim 1, it is characterized in that：For the milling train with the asymmetric roller function of intermediate calender rolls, the step（7）Plate shape executing agency intermediate calender rolls corner flowt value be calculated as follows：
For each frame of remaining in addition to last frame, when strip transmission side Edge shape is partially loose or tight slightly, then the offset of transmission side intermediate calender rolls bending roller force is calculated as follows respectively：
Otherwise
In formulaj --- represent upstream thejFrame,j=1,2 ...
For each frame of remaining in addition to last frame, when strip fore side Edge shape is partially loose or tight slightly, then the offset of fore side intermediate calender rolls bending roller force is calculated as follows respectively：
Otherwise
In formulaj --- represent upstream thejFrame,j=1,2 ...
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