CN109226280A - The bilateral wave and middle wave board-shape control method of five rack cold continuous rolling high strength steel plate bands - Google Patents
The bilateral wave and middle wave board-shape control method of five rack cold continuous rolling high strength steel plate bands Download PDFInfo
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- 230000002146 bilateral effect Effects 0.000 title claims abstract description 96
- 238000000034 method Methods 0.000 title claims abstract description 60
- 238000005096 rolling process Methods 0.000 title claims abstract description 31
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 28
- 239000010959 steel Substances 0.000 title claims abstract description 28
- 238000005452 bending Methods 0.000 claims abstract description 54
- 238000013000 roll bending Methods 0.000 claims description 16
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- 238000009499 grossing Methods 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 9
- 238000009826 distribution Methods 0.000 claims description 8
- 210000000481 breast Anatomy 0.000 claims description 6
- 230000007547 defect Effects 0.000 description 12
- 238000003801 milling Methods 0.000 description 7
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- 229910000885 Dual-phase steel Inorganic materials 0.000 description 3
- 239000004744 fabric Substances 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
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- 238000001746 injection moulding Methods 0.000 description 1
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- 239000000843 powder Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
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Abstract
The present invention provides a kind of bilateral wave and middle wave board-shape control method of five rack cold continuous rolling high strength steel plate bands, is related to Continuous Cold Rolled Strip Strip Shape Control technical field.This method provides the precondition controlled using the method for the present invention bilateral wave and middle wave plate shape first, and last rack is then set as the i-th rack, calculates the bilateral wave of the (i-1)-th rack outlet or middle wave plate shape value；The bilateral wave of the i-th rack outlet or middle wave plate shape calculated value and measured value are compared again, computed repeatedly until it meets finished product strip shape quality requirement；The correction value of the bending roller force of the (i-1)-th rack working roll and intermediate calender rolls is calculated again, if the requirements are not met, the correction value of the bending roller force of the i-th -2 rack working roll and intermediate calender rolls is then calculated, until the bilateral wave of the i-th rack outlet or middle wave plate shape deviation reach the requirement of finished product strip shape quality.Control method provided by the invention improves the bilateral wave of forward frame or middle unrestrained Strip Shape Control precision, reduces last rack regulation pressure, improve product strip shape quality.
Description
Technical field
The present invention relates to five high Mill Stand for Continuous Cold Rolled Strip Strip Shape Control technical fields, more particularly to five rack cold continuous rolling of one kind are high
The bilateral wave and middle wave board-shape control method of strong steel plate strip.
Background technique
Cold-strip steel is widely used in the every field of national economy, with the raising of cold-strip steel quality, user couple
The requirement of strip shape quality is also gradually increased.Good strip shape quality to improve downstream process product quality and lumber recovery play to
Close important role.
Plate shape is the important indicator for measuring strip geometric accuracy, is intuitively sticking up for strip as thickness, width
Qu Chengdu, its essence is roll distribution of the rear strip internal residual stress on plate width direction.Common flatness defect is broadly divided into
Bian Lang, middle wave, 1/4 wave and superposition of wind wave and swell etc..
Application No. is 201510006441.7 patents to propose a kind of Cold-roller for preventing the broken side wave defect of paper-thin strip
Skill.This method is set by tension, the cooperation of roll-force, achievees the purpose that control the bilateral wave of strip in razor-thin.But in this method
The formulation of the technological parameters such as tension and roll-force is to be not suitable for high-strength automobile based on the common intensity grade material for being less than 600MPa
The production of Strip.
Application No. is 200510028316.2 patents to propose a kind of milling method for overcoming compound shape wave.This method is logical
It crosses Optimization Work roller roller shape and reaches wave in control, bilateral wave and other complex seas shape defects.But this method is based on working roll
Axially movable CVC milling train and propose, the HC milling train and UCM that cannot be moved axially for widely applied working roll
Milling train is simultaneously not suitable for.
The resistance of deformation of automobile high-strength steel is higher, generally in 600MPa~1200MPa.During the rolling process due to rolling
Power is larger, causes the flexible deformation of roller system to increase, and then increase the control difficulty of plate shape.At present cold mill complex it is bilateral wave and
Middle wave Strip Shape Control relies primarily on the feedback control of last rack, i.e., obtains exporting by the plate shape measurement roller of last rack outlet bilateral
Wave and middle wave plate shape value, then the executing agency of last rack is fed back to eliminate bilateral wave and middle wave plate shape deviation.Due to intermediate machine
Frame does not configure plate shape measurement roller, can only be according to incoming profile, it is assumed that goes out each rack access panel shape to determine Ban Xing executing agency
Setting value.When the intensity of cold rolling supplied materials is higher, it is assumed that value and actual value deviation are larger, cannot achieve accurately control panel
Shape causes last rack inlet plate shape poor, even if last frame plate shape executing agency reaches the limit values, can not also eliminate by front
Bilateral wave and middle wave flatness defect caused by rack.
The bilateral wave of traditional cold continuous rolling and middle unrestrained board-shape control method, according to incoming hot rolled slab plate shape, to the plate of 1~4 rack
Shape carries out it is assumed that when the high strip of milling train production intensity rank, these assumption values and each rack actual value deviation are larger.In this way
As soon as reducing the bilateral unrestrained and middle unrestrained flatness defect ability of regulation and control of intermediate stand, increases last rack and eliminate flatness defect
Pressure.
Summary of the invention
It is high the technical problem to be solved by the present invention is in view of the above shortcomings of the prior art, provide five rack cold continuous rolling of one kind
The control method of the bilateral wave and middle wave flatness defect of strong steel plate strip, realizes the bilateral wave and middle wave plate shape to automobile high-strength steel
Defects controlling.
In order to solve the above technical problems, the technical solution used in the present invention is: a kind of five rack cold continuous rolling high strength steel plates
The control method of the bilateral wave and middle wave flatness defect of band, comprising the following steps:
A kind of bilateral wave and middle wave board-shape control method of five racks cold continuous rolling high strength steel plate band, comprising the following steps:
Step 1 judges whether the bending roller force of last rack working roll and intermediate calender rolls meets or exceeds the 90% of limiting value simultaneously,
And whether bilateral wave or middle wave plate shape deviation exceed finished product strip shape quality claimed range and otherwise execute if so, thening follow the steps 2
Step 5；
Last rack is set as the i-th rack by step 2, the bilateral wave in outlet surveyed according to the i-th rack or middle wave plate shape value with
The measured value of bending roller force is based on influence function method, calculates the bilateral wave of the i-th rack outlet or middle wave plate shape value；
Step 2.1 assumes that the bilateral unrestrained or middle wave plate shape value in the outlet of the (i-1)-th rack is flatnessi-1；
Step 2.2 calculates the bilateral wave of the i-th rack outlet according to the measured value of the i-th rack bending roller force by influence function method
Or middle wave plate shape value flatnessi, method particularly includes:
Step 2.2.1, according to the bilateral wave in the outlet of the (i-1)-th rack or middle wave plate shape value flatnessi-1Calculate the (i-1)-th machine
The Outlet Section distribution p rofile of framei-1, shown in following formula
Wherein, profilei-1It is distributed for the Outlet Section of the (i-1)-th rack, HjFor the (i-1)-th rack entrance jth dot thickness, Hc
For the center thickness of the (i-1)-th rack entrance,For the average thickness of the (i-1)-th rack entrance,For being averaged for the (i-1)-th rack outlet
Thickness；
Step 2.2.2, P is distributed using the roll-force that Blanc moral-Ford-Hill's equation calculates the i-th rack；
Step 2.2.3, it is distributed by the bending roller force and roll-force of surveying the i-th rack, calculates the roll gap pressure point of the i-th rack
Cloth, shown in following two formula:
QWI=P+FW/Lw_cy×Δx (2)
QIB=QWI+FI/Li_cy×Δx (3)
Wherein, QWIFor the roll gap pressure of the i-th rack working roll and intermediate calender rolls, QIBFor the i-th rack intermediate calender rolls and support roller
Roll gap pressure, FWFor the bending roller force of the i-th rack working roll, FIFor the bending roller force of the i-th rack intermediate calender rolls, Lw_cy is the i-th rack work
Make the hydraulic cylinder center of roller away from Li_cy is the hydraulic cylinder center of the i-th rack intermediate calender rolls away from Δ x is the unit of the i-th breast roller
Width；
Step 2.2.4, using influence function method, the i-th breast roller flexible deformation is calculated, so that it is determined that after the i-th rack is rolled
The distribution of section, shown in formula specific as follows:
YW=GW(QWI-P)-GFWFW (4)
YI=GI(QIB-QWI)-GFIFI (5)
YB=GBQIB (6)
YWI=YWI0+YI-YW-MI-MW (7)
YIB=YIB0+YB-YI-MB-MI (8)
YWS=GWSP (9)
profilei=H0+(YWS-YWS0)+(MW-YW) (10)
Wherein, P is the i-th rack roll-force；YW、YI、YBRespectively the i-th rack working roll, intermediate calender rolls, support roller elasticity
Bending；GW、GI、GBRespectively the i-th rack working roll, intermediate calender rolls, support roller elastic bending influence function, GFW、GFIRespectively
The influence function of i-th rack work roll bending power, intermediate calender rolls bending roller force；YWI、YIBRespectively the i-th rack working roll and intermediate calender rolls,
The compatible deformation of intermediate calender rolls and support roller；YWI0、YIB0Respectively the i-th rack working roll and intermediate calender rolls, intermediate calender rolls and support roller roller
Face center flattening amount；MW、MI、MBRespectively the i-th rack working roll, intermediate calender rolls, support roller convexity vector；YWSFor the i-th rack
Working roll caused by roll-force flattens；YWS0For working roll flattening amount caused by roll-force at the i-th frame plate center；GWSFor the i-th machine
Frame flattens influence function；profileiRear Latitudinal section is rolled for the i-th rack；H0Roll rear strip center thickness for the i-th rack one
Half；
Step 2.2.5, rear Latitudinal section profile is rolled using calculated i-th racki, calculate the i-th rack and roll rear strip
Bilateral wave or middle wave plate shape value flatnessi, shown in following formula:
Wherein, EsFor flexible strip modulus, νsFor strip Poisson's ratio；
Step 3, by the bilateral wave of the i-th rack outlet or middle wave plate shape calculated value flatnessiWith the bilateral wave of the i-th rack outlet
Or middle wave plate shape measured value flatnessi *Comparison corrects the (i-1)-th machine using exponential smoothing if error is more than setting value ε
The bilateral wave in the outlet that frame is assumed or middle wave plate shape value, re-execute the steps 2.2, recalculate flatnessi, until the i-th rack
Export bilateral wave or middle wave plate shape value flatnessiUntil meeting convergence precision, the bilateral wave in outlet of the (i-1)-th rack at this time is exported
Or middle wave plate shape value；
The bilateral wave in outlet assumed using the (i-1)-th rack of exponential smoothing iterated revision or middle wave plate shape value are as follows
Shown in formula:
Wherein,For the iterative value of the (i-1)-th rack n-th；It is the (i-1)-th rack (n-1)th time
Iterative value；λ is smoothing constant；For the calculated value of the (i-1)-th rack n-th；
Step 4, by the bilateral wave of calculated (i-1)-th rack outlet of step 3 or middle wave plate shape value and the (i-1)-th rack outlet mesh
Target shape compares, and calculates the (i-1)-th revised correction amount of rack bending roller force, reduces the bilateral unrestrained or middle wave plate shape of the (i-1)-th rack
Deviation improves the strip shape quality of i-1 rack, method particularly includes:
When calculating the (i-1)-th rack bending roller force correction amount, following objective function is defined:
Wherein, Δ εkFor the plate shape error in the (i-1)-th rack kth plate shape measurement section；K is the (i-1)-th frame plate shape measuring section,
K=1 ..., N, N be plate shape measurement division unit number；gwbRegulate and control coefficient for the (i-1)-th rack work roll bending；gibFor the (i-1)-th machine
Roll bending regulates and controls coefficient among frame；mwbFor the correction amount of the (i-1)-th rack work roll bending；mibFor roll bending among the (i-1)-th rack
Correction amount；Local derviation is asked to formula (13), is minimized objective function f (m), eliminates plate shape error, shown in following formula:
And then it finds out when objective function f (m) is minimized, the correction amount m of the (i-1)-th rack bending roller forcet；
If the revised correction value of bending roller force of step 5, the (i-1)-th rack working roll and intermediate calender rolls over-limit condition simultaneously
90%, and bilateral wave or middle wave plate shape deviation are still not up to the requirement of finished product strip shape quality, then re-execute the steps 2-4,
The i-th -2 revised correction value of rack roller is calculated, until the bilateral wave of the i-th rack outlet plate shape or middle unrestrained deviation reach production board
The requirement of form quality amount；
Step 6 terminates.
The beneficial effects of adopting the technical scheme are that a kind of five racks cold continuous rolling provided by the invention is high-strength
The bilateral wave and middle wave board-shape control method of steel plate strip, according to the bilateral wave of the actual measurement of last rack plate shape roller with middle wave plate shape value and respectively
The actual value of rack bending roller force, by computational accuracy, high and fireballing influence function method calculates the bilateral wave of forward frame entrance
It is higher compared to assumption value precision with middle wave plate shape, the bilateral wave of forward frame or middle wave plate shape powder injection molding precision are improved, is reduced
Last rack regulates and controls pressure, improves product strip shape quality.
Detailed description of the invention
Fig. 1 is a kind of bilateral wave and middle wave plate shape control of five racks cold continuous rolling high strength steel plate band provided in an embodiment of the present invention
The flow chart of method processed；
Fig. 2 is the bilateral wave of the i-th rack outlet provided in an embodiment of the present invention or middle wave plate shape flatnessiCalculation process
Figure；
Fig. 3 is the bilateral wave of the (i-1)-th rack outlet provided in an embodiment of the present invention or middle wave plate shape flatnessi-1Iteration is repaired
Positive flow chart；
Fig. 4 does not use the bilateral of five rack cold continuous rolling high strength steel plate bands of the invention for what first embodiment of the invention provided
The plate shape situation schematic diagram of production board band before wave and middle wave Strip Shape Control；
Fig. 5 is the bilateral wave using five rack cold continuous rolling high strength steel plate bands of the invention that first embodiment of the invention provides
With the plate shape situation schematic diagram of production board band after middle unrestrained board-shape control method；
Fig. 6 does not use the bilateral of five rack cold continuous rolling high strength steel plate bands of the invention for what second embodiment of the invention provided
The plate shape situation schematic diagram of production board band before wave and middle wave Strip Shape Control；
Fig. 7 is the bilateral wave using five rack cold continuous rolling high strength steel plate bands of the invention that second embodiment of the invention provides
With the plate shape situation schematic diagram of production board band after middle unrestrained board-shape control method；
Fig. 8 does not use the bilateral of five rack cold continuous rolling high strength steel plate bands of the invention for what third embodiment of the invention provided
The plate shape situation schematic diagram of production board band before wave and middle wave Strip Shape Control；
Fig. 9 is the bilateral wave using five rack cold continuous rolling high strength steel plate bands of the invention that third embodiment of the invention provides
With the plate shape situation schematic diagram of production board band after middle unrestrained board-shape control method.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Implement below
Example is not intended to limit the scope of the invention for illustrating the present invention.
The embodiment of the present invention uses the cold company of five racks of the invention by taking certain six roll five-machine frame tandem mills of 1740mm as an example
The bilateral wave and middle wave board-shape control method for rolling high strength steel plate band controls the bilateral wave of the milling train or middle wave plate shape.
In the present embodiment, the basic parameter of the milling train are as follows: work roll diameter: 430~480mm；Intermediate roller diameter: 510~
580mm；Support roller diameter: 1315~1465mm；Roller declination: -1mm~+1mm；Work roll bending power: -2400KN~
2400KN；Intermediate calender rolls bending roller force: -2700KN~2700KN；Middle roll shift: -125mm~+125mm.
A kind of bilateral wave and middle wave board-shape control method of five racks cold continuous rolling high strength steel plate band, as shown in Figure 1, include with
Lower step:
Step 1 judges whether the bending roller force of last rack working roll and intermediate calender rolls meets or exceeds the 90% of limiting value simultaneously,
And whether bilateral wave or middle wave plate shape deviation exceed finished product strip shape quality claimed range and otherwise execute if so, thening follow the steps 2
Step 5；
Last rack is set as the i-th rack by step 2, the bilateral wave in outlet surveyed according to the i-th rack or middle wave plate shape value with
The measured value of bending roller force is based on influence function method, calculates the bilateral wave of the i-th rack outlet or middle wave plate shape value；
Step 2.1 assumes that the bilateral unrestrained or middle wave plate shape value in the outlet of the (i-1)-th rack is flatnessi-1；
Step 2.2 calculates the bilateral wave of the i-th rack outlet according to the measured value of the i-th rack bending roller force by influence function method
Or middle wave plate shape value flatnessi, as shown in Fig. 2, method particularly includes:
Step 2.2.1, according to the bilateral wave in the outlet of the (i-1)-th rack or middle wave plate shape value flatnessi-1Calculate the (i-1)-th machine
The Outlet Section distribution p rofile of framei-1, shown in following formula
Wherein, profilei-1It is distributed for the Outlet Section of the (i-1)-th rack, HjFor the (i-1)-th rack entrance jth dot thickness, Hc
For the center thickness of the (i-1)-th rack entrance,For the average thickness of the (i-1)-th rack entrance,For being averaged for the (i-1)-th rack outlet
Thickness；
Step 2.2.2, P is distributed using the roll-force that Blanc moral-Ford-Hill's equation calculates the i-th rack；
Step 2.2.3, it is distributed by the bending roller force and roll-force of surveying the i-th rack, calculates the roll gap pressure point of the i-th rack
Cloth, shown in following two formula:
QWI=P+FW/Lw_cy×Δx (2)
QIB=QWI+FI/Li_cy×Δx (3)
Wherein, QWIFor the roll gap pressure of the i-th rack working roll and intermediate calender rolls, QIBFor the i-th rack intermediate calender rolls and support roller
Roll gap pressure, FWFor the bending roller force of the i-th rack working roll, FIFor the bending roller force of the i-th rack intermediate calender rolls, Lw_cy is the i-th rack work
Make the hydraulic cylinder center of roller away from Li_cy is the hydraulic cylinder center of the i-th rack intermediate calender rolls away from Δ x is the unit of the i-th breast roller
Width；
Step 2.2.4, using influence function method, the i-th breast roller flexible deformation is calculated, so that it is determined that after the i-th rack is rolled
The distribution of section, shown in formula specific as follows:
YW=GW(QWI-P)-GFWFW (4)
YI=GI(QIB-QWI)-GFIFI (5)
YB=GBQIB (6)
YWI=YWI0+YI-YW-MI-MW (7)
YIB=YIB0+YB-YI-MB-MI (8)
YWS=GWsP (9)
profilei=H0+(YWS-YWS0)+(MW-YW) (10)
Wherein, P is the i-th rack roll-force；YW、YI、YBRespectively the i-th rack working roll, intermediate calender rolls, support roller elasticity
Bending；GW、GI、GBRespectively the i-th rack working roll, intermediate calender rolls, support roller elastic bending influence function, GFW、GFIRespectively
The influence function of i-th rack work roll bending power, intermediate calender rolls bending roller force；YWI、YIBRespectively the i-th rack working roll and intermediate calender rolls,
The compatible deformation of intermediate calender rolls and support roller；YWI0、YIB0Respectively the i-th rack working roll and intermediate calender rolls, intermediate calender rolls and support roller roller
Face center flattening amount；MW、MI、MBRespectively the i-th rack working roll, intermediate calender rolls, support roller convexity vector；YWSFor the i-th rack
Working roll caused by roll-force flattens；YWS0For working roll flattening amount caused by roll-force at the i-th frame plate center；GWSFor the i-th machine
Frame flattens influence function；profileiRear Latitudinal section is rolled for the i-th rack；H0Roll rear strip center thickness for the i-th rack one
Half；
Step 2.2.5, rear Latitudinal section profile is rolled using calculated i-th racki, calculate the i-th rack and roll rear strip
Bilateral wave or middle wave plate shape value flatnessi, shown in following formula:
Wherein, EsFor flexible strip modulus, vsFor strip Poisson's ratio；
Step 3, by the bilateral wave of the i-th rack outlet or middle wave plate shape calculated value flatnessiWith the bilateral wave of the i-th rack outlet
Or middle wave plate shape measured value flatnessi *Comparison corrects the (i-1)-th machine using exponential smoothing if error is more than setting value ε
The bilateral wave in the outlet that frame is assumed or middle wave plate shape value, re-execute the steps 2.2, recalculate flatnessi, until the i-th rack
Export bilateral wave or middle wave plate shape value flatnessiUntil meeting convergence precision requirement, the outlet for exporting the (i-1)-th rack at this time is double
Side wave or middle wave plate shape value；
The bilateral wave in outlet assumed using the (i-1)-th rack of exponential smoothing iterated revision or middle wave plate shape value, such as Fig. 3
It is shown, shown in following formula:
Wherein,For the iterative value of the (i-1)-th rack n-th；It is the (i-1)-th rack (n-1)th time
Iterative value；λ is smoothing constant；For the calculated value of the (i-1)-th rack n-th；
Step 4, by the bilateral wave of calculated (i-1)-th rack outlet of step 3 or middle wave plate shape value and the (i-1)-th rack outlet mesh
Target shape compares, and calculates the (i-1)-th revised correction amount of rack bending roller force, reduces the bilateral unrestrained or middle wave plate shape of the (i-1)-th rack
Deviation improves the strip shape quality of i-1 rack, method particularly includes:
When calculating the (i-1)-th rack bending roller force correction amount, following objective function is defined:
Wherein, Δ εkFor the plate shape error in the (i-1)-th rack kth plate shape measurement section；K is the (i-1)-th frame plate shape measuring section,
K=1 ..., N, N be plate shape measurement division unit number；gwbRegulate and control coefficient for the (i-1)-th rack work roll bending；gibFor the (i-1)-th machine
Roll bending regulates and controls coefficient among frame；mwbFor the correction amount of the (i-1)-th rack work roll bending；mibFor roll bending among the (i-1)-th rack
Correction amount；
Local derviation is asked to formula (13), is minimized objective function f (m), eliminates plate shape error, shown in following formula:
And then it finds out when objective function f (m) is minimized, the correction amount m of the (i-1)-th rack bending roller forcet；
If the revised correction value of bending roller force of step 5, the (i-1)-th rack working roll and intermediate calender rolls over-limit condition simultaneously
90%, and bilateral wave or middle wave plate shape deviation are still not up to the requirement of finished product strip shape quality, then re-execute the steps 2-4,
The i-th -2 revised correction value of rack roller is calculated, until the bilateral wave of the i-th rack outlet plate shape or middle unrestrained deviation reach production board
The requirement of form quality amount；
Step 6 terminates.
Embodiment one:
Prepare with a thickness of 2.75mm, width is the QP980 Dual Phase Steel Sheet for Automobiles band of 1250mm, by five passage cold continuous rollings
Afterwards, it is rolled into the strip with a thickness of 0.7mm, using the bilateral wave and middle wave plate of five rack cold continuous rolling high strength steel plate bands of the invention
Before and after shape control method is controlled, the parameter of each rack bending roller force is as shown in table 1:
1 the method for the present invention of table each rack roller force parameter before and after coming into operation
As can be seen from Table 1, before the method for the present invention comes into operation, the bending roller force of the 5th rack has been approached limiting value, and front is several
The bending roller force of a rack also has a margin.Fig. 4 is the plate shape situation of production board band before the method for the present invention comes into operation, as can be seen from the figure
Strip shape quality is poor, shows apparent bilateral unrestrained defect in strip two sides.After the method for the present invention comes into operation, as shown in figure 5, each machine
Frame bending roller force actual value tends to be balanced, and finished product strip shape quality is clearly better.
Embodiment two:
Prepare with a thickness of 3.5mm, width is the DP980 Dual Phase Steel Sheet for Automobiles band of 1160mm, by five passage cold continuous rollings
Afterwards, it is rolled into the strip with a thickness of 1.2mm, using the bilateral wave and middle wave plate of five rack cold continuous rolling high strength steel plate bands of the invention
Before and after shape control method is controlled, the parameter of each rack bending roller force is as shown in table 2:
2 the method for the present invention of table each rack roller force parameter before and after coming into operation
As can be seen from Table 2, before the method for the present invention comes into operation, the bending roller force of the 5th rack has been approached limiting value, and front is several
The bending roller force of a rack also has a margin.Fig. 6 is the plate shape situation of production board band before the method for the present invention comes into operation, as can be seen from the figure
Strip shape quality is poor, shows apparent bilateral unrestrained defect in strip two sides.After the method for the present invention comes into operation, as shown in fig. 7, each machine
Frame bending roller force actual value tends to be balanced, and finished product strip shape quality is clearly better.
Embodiment three:
Prepare with a thickness of 3.5mm, width is the DP780 Dual Phase Steel Sheet for Automobiles band of 1200mm, by five passage cold continuous rollings
Afterwards, it is rolled into the strip with a thickness of 0.9mm, using the bilateral wave and middle wave plate of five rack cold continuous rolling high strength steel plate bands of the invention
Before and after shape control method is controlled, the parameter of each frame plate shape bending roller force is as shown in table 3:
3 the method for the present invention of table each rack roller force parameter before and after coming into operation
As can be seen from Table 3, before the method for the present invention comes into operation, the bending roller force of the 5th rack has been approached limiting value, and front is several
The bending roller force of a rack also has a margin.Fig. 8 is the plate shape situation of production board band before the method for the present invention comes into operation, as can be seen from the figure
Strip shape quality is poor, shows apparent bilateral unrestrained defect in strip two sides.After the method for the present invention comes into operation, as shown in figure 9, each machine
Frame bending roller force actual value tends to be balanced, and finished product strip shape quality is clearly better.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, it does not separate the essence of the corresponding technical solution, and the claims in the present invention are limited
Fixed range.
Claims (4)
1. a kind of bilateral wave and middle wave board-shape control method of five rack cold continuous rolling high strength steel plate bands, it is characterised in that: including with
Lower step:
Step 1 judges whether the bending roller force of last rack working roll and intermediate calender rolls meets or exceeds the 90% of limiting value simultaneously, and double
Whether side wave or middle wave plate shape deviation exceed finished product strip shape quality claimed range, if so, 2 are thened follow the steps, it is no to then follow the steps
5；
Last rack is set as the i-th rack by step 2, the bilateral wave in outlet or middle wave plate shape value and roller surveyed according to the i-th rack
The measured value of power is based on influence function method, calculates the bilateral wave of the i-th rack outlet or middle wave plate shape value；
Step 3, by the bilateral wave of the i-th rack outlet or middle wave plate shape calculated value flatnessiWith the i-th rack outlet it is bilateral wave or in
Wave plate shape measured value flatnessi *It is false to correct the (i-1)-th rack using exponential smoothing if error is more than setting value ε for comparison
If the bilateral wave in outlet or middle wave plate shape value, re-execute the steps 2.2, recalculate flatnessi, until the i-th rack outlet
Bilateral wave or middle wave plate shape value flatnessiUntil meeting convergence precision requirement, the bilateral wave in outlet of the (i-1)-th rack at this time is exported
Or middle wave plate shape value；
Step 4, by the bilateral wave of calculated (i-1)-th rack outlet of step 3 or middle wave plate shape value and the (i-1)-th rack outlet Target Board
Shape compares, and calculates the (i-1)-th revised correction amount of rack bending roller force, reduces the bilateral unrestrained or middle wave plate shape deviation of the (i-1)-th rack,
Improve the strip shape quality of i-1 rack；
If the revised correction value of bending roller force of step 5, the (i-1)-th rack working roll and intermediate calender rolls over-limit condition simultaneously
90%, and bilateral wave or middle wave plate shape deviation are still not up to the requirement of finished product strip shape quality, then re-execute the steps 2-4, count
The i-th -2 revised correction value of rack roller is calculated, until the bilateral wave of the i-th rack outlet plate shape or middle unrestrained deviation reach production board shape
The requirement of quality；
Step 6 terminates.
2. the bilateral wave and middle wave board-shape control method of five racks cold continuous rolling high strength steel plate band according to claim 1,
It is characterized in that: the step 2 method particularly includes:
Step 2.1 assumes that the bilateral unrestrained or middle wave plate shape value in the outlet of the (i-1)-th rack is flatnessi-1；
Step 2.2, by influence function method, according to the measured value of the i-th rack bending roller force, calculate the bilateral wave of the i-th rack outlet or in
Wave plate shape value flatnessi, method particularly includes:
Step 2.2.1, according to the bilateral wave in the outlet of the (i-1)-th rack or middle wave plate shape value flatnessi-1Calculate the (i-1)-th rack
Outlet Section distribution p rofilei-1, shown in following formula
Wherein, profilei-1It is distributed for the Outlet Section of the (i-1)-th rack, HjFor the (i-1)-th rack entrance jth dot thickness, HcIt is
The center thickness of i-1 rack entrance,For the average thickness of the (i-1)-th rack entrance,For the average thickness of the (i-1)-th rack outlet
Degree；
Step 2.2.2, P is distributed using the roll-force that Blanc moral-Ford-Hill's equation calculates the i-th rack；
Step 2.2.3, it is distributed by the bending roller force and roll-force of surveying the i-th rack, calculates the roll force distribution of the i-th rack,
Shown in following two formula:
QWI=P+FW/Lw_cy×Δx (2)
QIB=QWI+FI/Li_cy×Δx (3)
Wherein, QWIFor the roll gap pressure of the i-th rack working roll and intermediate calender rolls, QIBBetween the i-th rack intermediate calender rolls and the roller of support roller
Pressure, FWFor the bending roller force of the i-th rack working roll, FIFor the bending roller force of the i-th rack intermediate calender rolls, Lw_cy is the i-th rack working roll
Hydraulic cylinder center away from the hydraulic cylinder center that, Li_cy is the i-th rack intermediate calender rolls away from Δ x is the unit width of the i-th breast roller；
Step 2.2.4, using influence function method, the i-th breast roller flexible deformation is calculated, so that it is determined that the i-th rack rolls rear section
Distribution, shown in formula specific as follows:
YW=GW(QWI-P)-GFWFW (4)
YI=GI(QIB-QWI)-GFIFI (5)
YB=GBQIB (6)
YWI=YWI0+YI-YW-MI-MW (7)
YIB=YIB0+YB-YI-MB-MI (8)
YWS=GWSP (9)
profilei=H0+(YWS-YWS0)+(MW-YW) (10)
Wherein, P is the i-th rack roll-force；YW、YI、YBThe respectively elastic bending of the i-th rack working roll, intermediate calender rolls, support roller；
GW、GI、GBRespectively the i-th rack working roll, intermediate calender rolls, support roller elastic bending influence function, GFW、GFIRespectively the i-th machine
The influence function of frame work roll bending power, intermediate calender rolls bending roller force；YWI、YIBRespectively the i-th rack working roll and intermediate calender rolls, centre
The compatible deformation of roller and support roller；YWI0、YIB0The face of respectively the i-th rack working roll and intermediate calender rolls, intermediate calender rolls and support roller roller
Center flattening amount；MW、MI、MBRespectively the i-th rack working roll, intermediate calender rolls, support roller convexity vector；YWSFor the rolling of the i-th rack
Working roll caused by power flattens；YWS0For working roll flattening amount caused by roll-force at the i-th frame plate center；GWSFor the i-th rack pressure
Flat influence function；profileiRear Latitudinal section is rolled for the i-th rack；H0The half of rear strip center thickness is rolled for the i-th rack；
Step 2.2.5, rear Latitudinal section profile is rolled using calculated i-th racki, it is bilateral that the i-th rack of calculating rolls rear strip
Unrestrained or middle wave plate shape value flatnessi, shown in following formula:
Wherein, EsFor flexible strip modulus, νsFor strip Poisson's ratio.
3. the bilateral wave and middle wave board-shape control method of five racks cold continuous rolling high strength steel plate band according to claim 2,
It is characterized in that: the bilateral wave in the outlet assumed described in step 3 using the (i-1)-th rack of exponential smoothing iterated revision or middle wave plate shape
Value, shown in following formula:
Wherein,For the iterative value of the (i-1)-th rack n-th；For (n-1)th iteration of the (i-1)-th rack
Value；λ is smoothing constant；For the calculated value of the (i-1)-th rack n-th.
4. the bilateral wave and middle wave board-shape control method of five racks cold continuous rolling high strength steel plate band according to claim 3,
It is characterized in that: the step 4 method particularly includes:
When calculating the (i-1)-th rack bending roller force correction amount, following objective function is defined:
Wherein, Δ εkFor the plate shape error in the (i-1)-th rack kth plate shape measurement section；K is the (i-1)-th frame plate shape measuring section, k=
1 ..., N, N are plate shape measurement division unit number；gwbRegulate and control coefficient for the (i-1)-th rack work roll bending；gibFor in the (i-1)-th rack
Between roll bending regulate and control coefficient；mwbFor the correction amount of the (i-1)-th rack work roll bending；mibFor repairing for the (i-1)-th rack centre roll bending
Positive quantity；Local derviation is asked to formula (13), is minimized objective function f (m), eliminates plate shape error, shown in following formula:
T=wb or ib (14)
And then it finds out when objective function f (m) is minimized, the correction amount m of the (i-1)-th rack bending roller forcet。
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| CN112474819A (en) * | 2020-11-05 | 2021-03-12 | 通用电气（武汉）自动化有限公司 | Method and device for controlling shape of product |
| CN113020281A (en) * | 2021-03-10 | 2021-06-25 | 北京科技大学设计研究院有限公司 | Method for improving tail middle waves of hot-rolled strip steel |
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| CN113020255B (en) * | 2021-03-16 | 2022-09-06 | 攀钢集团西昌钢钒有限公司 | Method for flattening and rolling sheet strip steel |
| CN113239494A (en) * | 2021-05-31 | 2021-08-10 | 东北大学 | Method for designing multi-section type working roll profile of HC cold rolling mill |
| CN113239494B (en) * | 2021-05-31 | 2023-10-17 | 东北大学 | Design method of multistage working roll shape of HC cold rolling mill |
| CN113553702A (en) * | 2021-07-07 | 2021-10-26 | 南京工程学院 | Roll shape design method for effectively controlling high-order wave shape in cold continuous rolling process of high-strength steel |
| CN113553702B (en) * | 2021-07-07 | 2023-07-21 | 南京工程学院 | Roll shape design method for effectively controlling high-order wave shape in high-strength steel cold continuous rolling process |
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