CN1253261C - Hot-rolled strip steel moderate sea profile shape controlling method - Google Patents
Hot-rolled strip steel moderate sea profile shape controlling method Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 90
- 239000010959 steel Substances 0.000 title claims abstract description 90
- 238000000034 method Methods 0.000 title claims abstract description 55
- 238000005096 rolling process Methods 0.000 claims abstract description 62
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- 230000002146 bilateral effect Effects 0.000 abstract description 7
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- 238000005098 hot rolling Methods 0.000 abstract description 4
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Abstract
The present invention provides a moderate wave plate shape controlling method of hot rolling strip steel. The head part of strip steel is controlled in a moderate wave PCSU controlling mode, namely a PC setting controlling mode; the rear part of the strip steel is controlled in a dynamic automatic moderate wave plate shape controlling mode, namely a dynamic ASC controlling mode; the control quantity of the flatness of the moderate target wave of the strip steel is determined; the convexity of the strip steel which is finely rolled, the equivalent heat convexity of a roller and the elongation rate difference and the flatness of the strip steel are calculated; each coefficient, each constant term and each proportional coefficient in various calculation formulas is specifically determined according to the kinds, the sizes, etc. of rolling steel, and the flatness of the outlet strip steel which is finely rolled is controlled in a moderate wave controlling mode; the bilateral waves generated in the laminar flow cooling process of the strip steel which is finely rolled are effectively eliminated, the quality of the strip steel is improved, and the plate shape blocking quantity is obviously reduced. The method of the present invention is effective, simple and practical, and is suitable for the production lines of various kinds of hot rolling strip steel.
Description
Technical field
The invention belongs to the hot-strip field, unrestrained profile shape controlling method in particularly a kind of hot-strip is applicable to the plate shape control of various hot rolling band factory.
Background technology
The plate shape control of hot-strip plays an important role to the hot-strip quality, has succeeded in developing many Hot Strip shape control technologys at present, mainly contains following several method:
1, the technology controlling and process method comprises the plan rolling, tension force control method, roll temperature adjustment method and asymmetrical rolling method etc.
2, equipment control method, mainly contain initial roll forming method (comprising working roll and support roller), the hydraulic bending roll method, ladder support roller method, roll crown is adjusted method, and roll moves method, on-line grinding roll method, roll intersection control method etc., because modern hot-strip technology itself, it is very complicated that the control of plate shape seems, on modern hot strip rolling mill, the main at present multi-parameter integrated control method of finishing mill that adopts generally includes initial roll forming, hydraulic bending roll, comprehensive plate shape technology, for example WRB+WRS such as string roller technology or roll tandem rolling, PC+WRS (PCS), HC+WRB (UC) etc.However, Hot Strip shape control technology still has the following disadvantages at present: 1, and the multi-parameter integrated control technology of plate shape is not perfect, remains further to be optimized; 2, multiple operation, especially laminar flow did not cool off the appreciable impact that plate shape is produced before and after present plate shape many reference amounts control technology was considered it, i.e. laminar flow cooling can facilitate it to produce bilateral wave to the band steel that has good glacing flatness after the finish rolling.This is because the Volume Changes that will produce phase transformation, temperature drop after the finish rolling of hot rolling band and produce therefrom in the laminar flow cooling procedure, it is uneven that this variation changes along the strip width direction, finally can cause along strip width direction residual stress, show as strip edge portion on the macroscopic view and produce shape wave, be called the limit wave.Theoretical research and actual plate shape testing result have proved that all hot-strip is cooled off meeting produces bilateral wave, does not still have solution at present.
Summary of the invention
The purpose of this invention is to provide a kind of band steel toe portion is adopted in unrestrained PCSU set control, its rear section is adopted unrestrained profile shape controlling method in the hot-strip of wave control among the dynamic ASC, to solve the bilateral unrestrained defective that hot-strip causes because of cooling.
According to unrestrained profile shape controlling method in the hot-strip of the present invention, described promptly PC sets control to being with unrestrained PCSU control in the employing of steel toe portion, partly adopts unrestrained control in the dynamic auto plate shape to being with steel thereafter, i.e. dynamically ASC control,
Unrestrained PCSU setting control flow is in described:
1) assign rolling scaduled instruction by the three-level computer of computer control system,
2) by steel grade and the specification of second computer, determine unrestrained flatness controlled quentity controlled variable in the finished strip target according to defined in rolling scaduled,
3) calculate each frame roll-force of gained finish rolling, rolling temperature, mill speed and belt steel thickness, width data by plate shape setting model PCSU according to finish rolling setting model FSU, calculate each frame roll wear convexity of finish rolling and hot convexity,
4) the roll angle of the crossing of each frame of calculating finish rolling is PC angle and bending roller force,
5) detect the actual flatness of finish rolling outlet band steel toe portion that obtains by finishing mill outlet Straightness Meter, and compare with target flatness value,
6) comparative result is if both unanimities are then controlled end, if it is inconsistent, then revise 7 upper and lower limit of F7 flatness of finish rolling, start the PCSU model once more and carry out plate shape setting calculating, repetition 3)～5) the above-mentioned step is carried out this process repeatedly, wave value in reaching desired band steel toe portion, unrestrained control flow is among the described dynamic ASC:
Steel grade and specification in the rolling scaduled instruction of assigning according to three-level computer, determine in the band steel target unrestrained flatness and start simultaneously following a), b) flow process:
A) gather unrestrained flatness actual value in the finishing mill outlet band steel, and with above-mentioned target in unrestrained flatness relatively, if both unanimities, show and realize good plate shape control, otherwise just bending roller force and the roll-force actual value by 7 F7 of feedback ASC model adjustment finish rolling realizes the control of plate shape, make it to reach desired value
B) after described PCSU setting model control band steel toe portion flattening degree, be about to actual roll-force and the bending roller force locking of steel at finishing mill F5, F6, F7 frame, then roll-force and bending roller force value and the lock value of actual measurement are made comparisons, if both unanimities, show and realize that plate shape is well controlled, otherwise just adjust the roll-force and the bending roller force of F5, F6, F7 frame by preceding ASC model, consistent to realize desired value.
According to unrestrained profile shape controlling method in the hot-strip of the present invention, described in unrestrained plate shape setting model PCSU by strip profile computing formula, roll equivalence convexity computing formula, band steel percentage elongation calculates formula and the flatness computing formula is formed.
According to unrestrained profile shape controlling method in the hot-strip of the present invention, the strip profile computing formula of described plate shape setting model PCSU is
C (i)=aPi-bFi-cC
θ-d (kCr+C
w+ C
T+ C
L)+ec (i-1)+Cc i.e. i frame strip profile C (i) equals: this frame roll-force Pi that multiply by a coefficient a deducts this frame bending roller force Fi that multiply by a coefficient b, deducts the roll equivalence convexity C that multiply by coefficient c again
θ, deduct again all kinds of roll crown that multiply by coefficient d each and, promptly multiply by the initial convexity Cr of roll of coefficient k, roll wear convexity C
W, roller heat convex degree learning C
T, roll study convexity C
LSum is added the strip profile C (i-1) of a last rolling mill that multiply by coefficient e, adds a strip profile constant C
C, roll equivalence convexity C
θComputing formula be:
C
θ＝{L
2·tan
2(πθ)/180}/(2D
W)
θ is the roll angle of the crossing in the formula
L is a working roll length,
D
WBe work roll diameter.
According to unrestrained profile shape controlling method in the hot-strip of the present invention, described in unrestrained plate shape setting model PCSU by the computing formula that the band steel extends rate variance be:
ε (i)=s{C (i)/h (i)-uC (i-1)/h (i-1) }+v ε (i-1)+C ε promptly the band steel exports percentage elongation ε (i) of i frame equal, the ratio that this frame band steel goes out convexity C (i) and this frame band steel exports thickness h (i) deducts the difference that last band steel exports convexity C (i-1) be multiplied by a coefficient u and the ratio of last band steel exports thickness h (i-1) and is multiplied by a coefficient s, and the band steel of adding last frame extends rate variance ε (i-1) and takes advantage of a coefficient v to add an extension rate variance constant C ε.
According to unrestrained profile shape controlling method in the hot-strip of the present invention, described in the computing formula of band steel flatness of unrestrained plate shape setting model PCSU be:
λ＝{200·sign(ε)·|ε|
-0.5λ}/π
λ is a band steel flatness in the formula.
According to unrestrained profile shape controlling method in the hot-strip of the present invention, the feedback ASC model formation among the described dynamic ASC in the wave control is:
ΔPB＝(KP
lay·ΔLmd+KI
lay∑ΔLmd)·/Prmf
lay
Δ Lmd-Lmd
Pri-Lmd
ActBe that mill roll bending power adjustment amount Δ PB equals target flatness Lmd
PrI and actual flatness Lmd
ActDifference DELTA Lmd take advantage of a proportionality constant KP
Lay, add that flatness difference DELTA Lmd sum takes advantage of a coefficient of colligation KI
Lay, again by the influence coefficient Prnf of bending roller force to flatness
LayRemove.
According to unrestrained profile shape controlling method in the hot-strip of the present invention, unrestrained plate shape control feedforward ASC model formation is among the described dynamic ASC:
/PB＝(A
lay·/ΔF-B
lay·ΔFB)·KRF
lay/a
cnt
/F＝F
act-F0
Δ FB=(Pb
Act-PBO) a
CntThe difference DELTA PB that is bending roller force equals to survey rolling force F
ActMultiply by plate shape control coefrficient A with poor/Δ F of locking rolling force F O
Lay, deduct actual measurement bending roller force PB
ActMultiply by bending roller force to roll-force conversion coefficient a with the difference of locking bending roller force PBO
CntThe Δ FB of gained is multiplied by another plate shape control coefrficient B
Lay, this difference is multiplied by a gain coefficient KRF
LayAgain divided by the conversion coefficient a of bending roller force to roll-force
CntResulting merchant.
Adopt above-mentioned in after the unrestrained controlled rolling technology, band steel production board shape quality improvement, effect is remarkable.
Description of drawings
Fig. 1 is good finished strip plate shape control procedure block diagram,
Fig. 2 is that wave is set control flow chart in the plate shape.
Fig. 3 be plate shape dynamically in unrestrained control flow chart.
The specific embodiment
Below in conjunction with description of drawings the specific embodiment of the present invention.
As shown in Figure 1, heating by slab that------the laminar flow cooling---is batched---in the hot-rolled strip production line of finished product in roughing-finish rolling, unrestrained plate shape controlling unit in mm finishing mill unit partly increases, its objective is by adopting PCSU to set control band steel toe portion, the dynamically middle wave control of ASC is adopted in its rear section, overcome because of the laminar flow cooling produces temperature drop, is out of shape the bilateral wave of band steel that the formed residual stress ownership causes mutually, make finished strip have good plate shape.As shown in Figure 2, the middle unrestrained PCSU setting control flow of unrestrained profile shape controlling method is in the hot-strip of the present invention: unrestrained PCSU control during band steel toe portion is adopted, and promptly PC sets and controls,
Unrestrained PCSU setting control flow is in described:
1) assign rolling scaduled instruction by the three-level computer of computer control system,
2) by steel grade and the specification of second computer, determine unrestrained flatness controlled quentity controlled variable in the finished strip target according to defined in rolling scaduled,
3) calculate each frame roll-force of gained finish rolling, rolling temperature mill speed and belt steel thickness, width data by plate shape setting model PCSU according to finish rolling setting model FSU, calculate each frame roll wear degree of finish rolling and hot convexity,
4) the roll angle of the crossing of each frame of calculating finish rolling is PC angle and bending roller force,
5) detect the actual flatness of finish rolling outlet band steel toe portion that obtains by finishing mill outlet Straightness Meter, and compare with target flatness value,
6) comparative result both if unanimity then control end, as if inconsistent, then revise the upper and lower limit of flatness of 7 F7 of finish rolling, start the PCSU model once more and carry out plate shape setting calculating, repeat above-mentioned 3)～5) carry out this process repeatedly, wave value in reaching desired band steel toe portion.
Set control by middle unrestrained PCSU, make the actual flatness of the head of hot-strip reach consistent, to keep good head plate shape with the target flatness.
As shown in Figure 3, according to the dynamic control flow of middle unrestrained ASC in the unrestrained profile shape controlling method in the hot-strip of the present invention be: steel grade and specification in the rolling scaduled instruction of assigning according to three-level computer, determine in the band steel target unrestrained flatness and start simultaneously following a), b) flow process:
A) gather unrestrained flatness actual value in the finishing mill outlet band steel, and with above-mentioned target in unrestrained flatness relatively, if both unanimities, show and realize good plate shape control, otherwise just bending roller force and the roll-force actual value by 7 F7 of feedback ASC model adjustment finish rolling realizes the control of plate shape, make it to reach desired value
B) after described PCSU setting model control band steel toe portion flattening degree, be about to actual roll-force and the bending roller force locking of steel at finishing mill F5, F6, F7 frame, then roll-force and bending roller force value and the lock value of actual measurement are made comparisons, if both unanimities, show and realize that plate shape is well controlled, otherwise just adjust the roll-force and the bending roller force of F5, F6, F7 frame by preceding ASC model, consistent to realize with desired value.
By this control flow, make the actual band steel flatness of the later remainder of hot-strip head reach consistent, thereby make the entire belt steel obtain good plate shape with the target flatness.
Unrestrained profile shape controlling method in the hot-strip of the present invention is tested on 1780 production lines, use the SPHC steel grade of the most frequent production, during specification 2.75 * 1250mm hot-strip, each coefficient in the relevant Mathematical Modeling and the concrete span of every constant are as follows:
1, strip profile computing formula C (i)=aPi-bFi-cC
θ-d (kCr+C
W+ C
T+ C
LCoefficient value among)+ec (i-1)+Cc is respectively a=0.01～0.05, b=0.04～0.10, c=0.1～0.5, d=0.05～0.3, k=0.2～0.7, e=0.1～0.8, strip profile constant C
C=0.005～0.02.
2, the band steel extends the rate variance computing formula: ε (i)=s{C (i)/h (i)-uiC (i-1)/h (i-1) }+coefficient value among v ε (i-1)+C ε is s=0.1～0.6, u=0.2～0.7, and rate variance constant C ε=0.01～0.1 is extended in v=0.1～0.9.
3, feedback ASC model formation Δ PB=(KP
LayΔ Lmd+KI
Lay∑ Δ Lmd)/Prmf
LayIn proportionality coefficient KP
Lay=0.1～0.9, coefficient of colligation KI
Ray=0.1～0.9, influence coefficient Prmf
Lay=Lmd/PB.
The actual count data show, do not adopting before the method for the present invention, when its finish rolling exit plate shape measured value is 5I, its production board shape measured value is 19I, after illustrating that the band steel is through the laminar flow cooling, plate deformation turns to 14I, therefore, in unrestrained controlled quentity controlled variable be 14I, can adopt following two kinds of methods to realize wave control in the finish rolling:
1, with the flatness of 7 F7 of the control finish rolling of the plate shape among the finish rolling plate shape setting control model PCSU, bound is adjusted to (10 ,-50) by (20 ,-20), sets control with the middle wave of realizing the band steel toe 14I of portion,
2, adjust among the finish rolling plate shape dynamic control model FSU that unrestrained flatness changes 14I into by OI in the template target, with middle unrestrained dynamic sheet shape control with the steel remainder.Adopt after the above-mentioned control process, band steel finished product strip shape quality significantly improves, and is as follows to the band steel production board graphic data comparing result of using each 992 blocks of identical steel grade of the inventive method front and back and specification:
Before the application: the bilateral unrestrained 98I of flatness, 920, account for 92%,
After the application, the bilateral unrestrained 24.6I of glacing flatness, accounts for 95.3% by 953.
The contrast of finished strip blockade amount,
Before the application, average blocking rate 2.385%;
After the application, average blocking rate 0.914%.
Experiment showed, of the present invention in unrestrained board-shape control method be effectively, also be very simple and practical, be applicable to all kinds of hot-rolled strip production lines.
Claims (12)
1, unrestrained board-shape control method in a kind of hot-strip is characterized in that promptly PC sets control to being with unrestrained PCSU control in the employing of steel toe portion, partly adopts unrestrained control in the dynamic auto plate shape to being with steel thereafter, i.e. dynamically ASC control,
Unrestrained PCSU setting control flow is in described:
1) assign rolling scaduled instruction by the three-level computer of computer control system,
2) by steel grade and the specification of second computer control, determine unrestrained flatness controlled quentity controlled variable in the finished strip target according to defined in the rolling scaduled instruction,
3) calculate each frame roll-force of gained finish rolling, rolling temperature, mill speed and belt steel thickness, width data by plate shape setting model PCSU according to finish rolling setting model FSU, calculate each frame roll wear convexity of finish rolling and hot convexity,
4) the roll angle of the crossing of each frame of calculating finish rolling is PC angle and bending roller force,
5) detect the actual flatness of finish rolling outlet band steel toe portion that obtains by finishing mill outlet Straightness Meter, and compare with target flatness value,
6) comparative result as if inconsistent, is then revised the upper and lower limit of flatness of 7 F7 of finish rolling if both unanimities are then controlled end, start the PCSU model once more and carry out plate shape setting calculating, repeat above-mentioned 3)～5) step, carry out this process repeatedly, wave value in reaching desired band steel toe portion;
Unrestrained control flow is among the described dynamic ASC:
Steel grade and specification in the rolling scaduled instruction of assigning according to three-level computer, determine in the band steel target unrestrained flatness and start simultaneously following a), b) flow process:
A) gather finishing mill outlet band steel flatness actual value, and with above-mentioned target in unrestrained flatness relatively, if both unanimities, show and realize good plate shape control, otherwise just the bending roller force actual value by 7 F7 of feedback ASC model adjustment finish rolling realizes the control of plate shape, makes it to reach desired value
B) after described PCSU setting model control band steel toe portion flattening degree, be about to actual roll-force and the bending roller force locking of steel at finishing mill F5, F6, F7 frame, then roll-force and bending roller force value and the lock value of actual measurement are made comparisons, if both unanimities, show and realize that plate shape is well controlled, otherwise just adjust the roll-force and the bending roller force of F5, F6, F7 frame by feedforward ASC model, consistent to realize with desired value.
2, unrestrained profile shape controlling method in the hot-strip according to claim 1, it is characterized in that described in unrestrained plate shape setting model PCSU by strip profile computing formula, roll equivalence convexity computing formula, band steel percentage elongation calculates formula and the flatness computing formula is formed.
3, unrestrained profile shape controlling method in the hot-strip according to claim 2 is characterized in that the strip profile computing formula of described plate shape setting model PCSU is
C (i)=aPi-bFi-cC
0-d (kCr+C
w+ C
T+ C
L)+eC (i-1)+Cc i.e. i frame strip profile C (i) equals: this frame roll-force Pi that multiply by a coefficient a deducts this frame bending roller force Fi that multiply by a coefficient b, deducts the roll equivalence convexity C that multiply by coefficient c again
0, deduct again all kinds of roll crown that multiply by coefficient d each and, promptly multiply by the initial convexity Cr of roll of coefficient k, roll wear convexity C
W, roller heat convex degree learning C
T, roll study convexity C
LSum is added the strip profile C (i-1) of a last rolling mill that multiply by coefficient e, adds a strip profile constant C
C, roll equivalence convexity C
θComputing formula be:
C
0＝{L
2·tan
2(πθ)/180}/(2D
w)
θ is the roll angle of the crossing in the formula,
L is a working roll length,
D
wBe work roll diameter.
4, unrestrained profile shape controlling method in the hot-strip according to claim 2, it is characterized in that described in the band steel of the unrestrained plate shape setting model PCSU computing formula of extending rate variance be:
ε (i)=s{C (i)/h (i)-uC (i-1)/h (i-1) }+v ε (i-1)+C ε promptly the band steel exports percentage elongation ε (i) of the i frame ratio that equals this frame band steel exports convexity C (i) and this frame band steel exports thickness h (i) deduct last band steel exports convexity C (i-1) and be multiplied by a coefficient u and last and be with the difference of the ratio of steel exports thickness h (i-1) to be multiplied by a coefficient s, the band steel of adding last frame extends rate variance ε (i-1) and takes advantage of a coefficient v, adds one and extends rate variance constant C ε.
5, unrestrained profile shape controlling method in the hot-strip according to claim 2, it is characterized in that described in the computing formula of band steel flatness of unrestrained plate shape setting model PCSU be:
λ＝{200·sign(ε)·|ε|
-0.5λ}/π
λ is a band steel flatness in the formula.
6, unrestrained profile shape controlling method in the hot-strip according to claim 1 is characterized in that the feedback ASC model formation in the wave control is among the described dynamic ASC:
It is mill roll bending power adjustment amount
Equal target flatness Lmd
PriWith actual flatness Lmd
ActDifference
Take advantage of a proportionality constant KP
Lay, add the flatness difference
Sum C
1Take advantage of a coefficient of colligation KI
Lay, again by the influence coefficient Prmf of bending roller force to flatness
LayRemove.
7, unrestrained profile shape controlling method in the hot-strip according to claim 1 is characterized in that unrestrained plate shape control feedforward ASC model formation is among the described dynamic ASC:
It is the difference of bending roller force
Equal to survey rolling force F
ActPoor with locking rolling force F O
Multiply by plate shape control coefrficient A
Lay, deduct actual measurement bending roller force PB
ActMultiply by bending roller force to roll-force conversion coefficient a with the difference of locking bending roller force PBO
CntGained
Be multiplied by another plate shape control coefrficient B
Lay, this difference is multiplied by a gain coefficient KRF
LayAgain divided by the conversion coefficient a of bending roller force to roll-force
CntResulting merchant.
8, unrestrained profile shape controlling method in the hot-strip according to claim 3 is characterized in that specification 2.75 * 1250mm is with steel for the rolling SPHC steel of 1780 hot-rolled strip production lines, described strip profile computing formula C (i)=aPi-bFi-cC
θ-d (kCr+C
w+ C
T+ C
L)+eC (i-1)+C
CIn coefficient value be respectively a=0.01～0.05, b=0.04～0.10, c=0.1 ~ 0.5, d=0.05～0.3, k=0.2～0.7, e=0.1～0.8, strip profile constant C
C=0.005～0.02.
9, unrestrained profile shape controlling method in the hot-strip according to claim 4 is characterized in that specification 2.75 * 1250mm is with steel for the rolling SPHC steel of 1780 hot-rolled strip production lines, and the band steel extends the rate variance computing formula:
ε (i)=s{C (i)/h (i)-uC (i-1)/h (i-1) }+coefficient value among v ε (i-1)+C ε is s=0.1～0.6, u=0.2～0.7, and rate variance constant C ε=0.01～0.1 is extended in v=0.1～0.9.
10, unrestrained profile shape controlling method in the hot-strip according to claim 6 is characterized in that specification 2.75 * 1250mm is with steel for the rolling SPHC steel of 1780 hot-rolled strip production lines, described feedback ASC model formation:
Middle proportionality coefficient KP
Lay=0.1～0.9, coefficient of colligation KI
Lay=0.1～0.9, influence coefficient Prmf
Lay=Lmd/PB.
11, unrestrained profile shape controlling method in the hot-strip according to claim 7 is characterized in that specification 2.75 * 1250mm is with steel for the rolling SPHC steel of 1780 hot-rolled strip production lines, described feedforward ASC model formation
In plate shape control coefrficient value A
Lay=0.1～0.8, B
Lay=0.06～0.5, gain coefficient KRF
Lay=0.4～0.8, bending roller force is to roll-force conversion coefficient a
Cnt=0.5～0.9.
12, unrestrained profile shape controlling method in the hot-strip according to claim 1, it is characterized in that, for the rolling SPHC steel of 1780 hot-rolled strip production lines, during specification 2.75 * 1250mm band steel, the upper and lower limit of flatness of 7 F7 of finish rolling among the plate shape setting control model PCSU is adjusted into (10 ,-50), unrestrained flatness in the target in the finish rolling plate shape control model is set at 14I.
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2002
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