CN107442578A - A kind of cold rolling superthin CVC board-shape control methods - Google Patents
A kind of cold rolling superthin CVC board-shape control methods Download PDFInfo
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- CN107442578A CN107442578A CN201610375125.1A CN201610375125A CN107442578A CN 107442578 A CN107442578 A CN 107442578A CN 201610375125 A CN201610375125 A CN 201610375125A CN 107442578 A CN107442578 A CN 107442578A
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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
- B21B37/30—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/40—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling foils which present special problems, e.g. because of thinness
-
- 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
- B21B37/44—Control of flatness or profile during rolling of strip, sheets or plates using heating, lubricating or water-spray cooling of the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/02—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring flatness or profile of strips
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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Abstract
The present invention relates to cold rolling field, specially a kind of cold rolling superthin CVC board-shape control methods.This method detailed process is as follows：Using the roller CVC milling train contact testing technique for shape of strip of single chassis 6, inlet of rolling mill, outlet are respectively furnished with two sets of plate profile instrument detecting systems；The plate shape roller configured is using the overall body of roll, the frame mode of segmentation pressure sensitive, every section of the plate shape roller only pressure sensor, one signal of the feedback that often rotates a circle；Pressure sensor detection strip each section of pressure in the direction of the width, pressure size with the power of output electric signal embody.The problems such as broken belt accident present in present invention solution prior art is frequent, and plate shape is difficult to control, and shape wave is larger.
Description
Technical field
The present invention relates to cold rolling field, specially a kind of cold rolling superthin CVC board-shape control methods.
Background technology
CVC is Continuously Variable Croun english abbreviation, so-called CVC milling trains just refer in order to
Meet the needs for adjusting tropical plate crown and template, working roll be processed into the CVC rollers with the S bodies of roll,
Upper working rolls and lower working rolls are mutually being inverted 180 degree, so as to which zero load roll gap shape is continuous when having work roll shifting
The milling train of varying ability.
Cold-rolled products are occupied an important position with its excellent product quality in national economy, with China GDP
News speed increase, application of the cold-rolled products in national economy is also more and more extensive, from articles for daily use to building,
The trace of the visible cold-rolled products everywhere such as machine components, automobile, household electrical appliances, with the ownership of market economy
To the quality requirement of cold-rolled products also more and more higher.Ultra-thin cold-reduced sheet (thickness 0.4-0.18mm) is produced as coating
The substrate of product and tin-plated product, there are wide market prospects and development space, and domestic cold rolling industry at present
The highly sophisticated products of focus development.The accurate control requirement of ultra-thin cold-reduced sheet plate shape is higher than in general cold-rolled products, its
Strip Shape Control is for being all Technology Difficulties problem both at home and abroad.The domestic control aspect in ultra-thin strip does not have also at present
Ripe technology application.In addition, the rolling of Thin Specs (0.18-0.5mm) strip, is always technological difficulties,
Because strip is relatively thin, broken belt accident is frequent, and plate shape is difficult to control, and shape wave is larger.
The content of the invention
It is an object of the invention to provide a kind of cold rolling superthin CVC board-shape control methods, solve in the prior art
The problems such as existing broken belt accident is frequent, and plate shape is difficult to control, and shape wave is larger.
The technical scheme is that：
A kind of cold rolling superthin CVC board-shape control methods, detailed process are as follows：Using the roller CVC milling trains of single chassis 6
Contact testing technique for shape of strip, inlet of rolling mill, outlet are respectively furnished with two sets of plate profile instrument detecting systems；The plate configured
Shape roller is using the overall body of roll, the frame mode of segmentation pressure sensitive, every section of the plate shape roller only pressure sensing
Device, one signal of the feedback that often rotates a circle；Pressure sensor detects strip each section of pressure in the direction of the width, pressure
Power size with the power of output electric signal embody.
Described cold rolling superthin CVC board-shape control methods, according to calculation formula by conversion pressure into inside strip
Stress intensity, finally show the actual conditions of plate shape in graph form at computer HMI interfaces.
Described cold rolling superthin CVC board-shape control methods, the roller CVC milling trains of single chassis 6 enter andante by plate profile instrument
Shape detection, the hydraulic bending roll of working roll and intermediate calender rolls, hydraulic pressing cylinder inclination control, intermediate calender rolls CVC axial directions
Mobile, working roll EDC axial movements, emulsion Local cooling collectively form milling train plate shape online feedback closed loop
Control system.
Described cold rolling superthin CVC board-shape control methods, calculate processing automatically according to raw material parameter milling train first
Passage, in the operation of rolling, in the case of the regulation of working roll, intermediate calender rolls bending roller force disclosure satisfy that Strip Shape Control,
CVC rollers are without play；When incoming profile change causes working roll, intermediate calender rolls bending roller force to reach its control maximum
During the 70-80% of ability, CVC rollers proceed by dynamic and adjusted, and change roll gap profile convexity, improve Mill
Shape control ability is avoided because being brought the negative effect to Strip Shape Control using big bending roller force again.
Described cold rolling superthin CVC board-shape control methods, are detected in the entrance and exit of milling train by plate shape roller
The strip profile and flatness arrived, glacing flatness curve is processed into through mathematical analysis, it represents strip profile and flatness desired value and reality
The difference of actual value, the difference is categorized as once through mathematical modeling, is secondary, the major defect of four times and the equation of higher degree,
It is respectively transmitted to corresponding Strip Shape Control executing agency.
Described cold rolling superthin CVC board-shape control methods, hydraulic pressing cylinder inclination control solve once linear and lacked
Fall into, work roll bending solves conic section defect, intermediate calender rolls play and middle roll bending solution biquadratic parabola lack
Fall into, remaining small, complicated, asymmetrical defect is solved by sub-sectional cooling system；High sublinear equation control
Mode makes the contact load between working roll, intermediate calender rolls, backing roll uniform and symmetrical, enables milling train Strip Shape Control
Power strengthens.
Advantages of the present invention and beneficial effect are：
1st, the present invention is re-defined, convexity will by the data collection and analysis of early stage to raw material standard
To ask at 30 μm -60 μm, wedge shape is less than 50 μm, and the raw material beyond this scope will have an impact to rolling rear plate shape,
As found to be closed in raw material inspection, contact tandem rolling carries out material returned processing, if deflection is less than 80% during rolling
Using 5 passes, former passage C1=0, C2=-9.5, last a time C1=5, C2=-1.9, C16=-7.5,
C1 curves are compensated in end product passage and reduce C2 values according to easily there is the unilateral unrestrained phenomenon of fore side
To reduce middle wave, make edge tighter using C16 values, reduce the possibility for producing side wave.
2nd, greatly improved using the ultra-thin milling train plate shape of the present invention, the moon degradation rate by original 2.11% be down to 1.52%
Left and right, indivedual month degradation rates are below 1%.
3rd, current this steel cold rolling superthin milling train product, plate shape is good, and by this tackling key problem, it is qualified to improve plate shape
Rate, cold rolling carbon products plate shape has been obtained good lifting, obtain the consistent favorable comment of downstream client, technology
It is on the leading domestic level.
4th, the present invention has obtained ultra-thin milling train product plate shape and raw material profile by substantial amounts of Data acquisition and issuance
Relation between rolling parameter, it is determined that the change pair of correlation degree and technological parameter between each technological parameter
The influence of product plate shape.Adjustment is simulated to rolling parameter by math equation, and by verification experimental verification,
It has been finally completed technique adjustment.So that ultra-thin milling train product plate shape qualification rate is substantially improved, galvanizing unit sideslip
Number is greatly reduced, and obtains the consistent affirmative of user.
5th, the plate shape of current Ultra-thin is increasingly stable, after predominantly product plate shape improves in terms of economic benefit,
The increase of Thin Specs contracted quantity and reduce direct economic benefit caused by degradation product.Indirect benefit is production board
Shape meets the economic benefit that the stable market share that customer requirement is brought, raising and the decline of objection rate etc. are brought.
Brief description of the drawings
Fig. 1 is glacing flatness index curve of the present invention.
Fig. 2 is the feedback control procedure schematic diagram of plate shape of the present invention.
Fig. 3 is the roller CVC+HS milling train plate shape control strategy figures of single chassis 6 of the present invention.
Embodiment
In the present invention, relational language is explained as follows：
Plate shape：The warpage degree for referring to sheet material intuitively is said, its essence is exactly to refer to the distribution of internal residual stress.Plate
Shape includes strip two aspect size index in length and breadth.Longitudinal direction is often referred to glacing flatness (shape wave), i.e., along strip length direction
On planarization.The section configuration of horizontal fingerboard, i.e., the thickness distribution on plate width direction, including strip crown,
Edge thinning etc..Wherein strip crown is that horizontal plate shape represents index.
Strip flatness：Strip glacing flatness just refers to the distribution of internal residual stress, the deformation process of board rolling
In, good profile should all have homogeneous Longitudinal extending along each fillet part of plate width.And work as along strip transverse direction
During drafts skewness, extension inequality will occur accordingly for each fillet of plate width, because strip is one
Overall, check and balance influence between each fillet.This will produce the internal stress of interaction between each fillet.When
When this internal stress is sufficiently large, the warpage (shape wave) of strip will be caused.Common are side it is unrestrained, it is middle wave, four points
One of wave etc..
Glacing flatness (with respect to extension difference E)：As shown in figure 1, relative extension difference E can use in transverse direction it is most long with most
Relative length difference expression between short taeniae, E=Δs L/L；In formula：L is most short taeniae length, mm；Δ L is
The most long and length difference of most short taeniae in transverse direction.
The international system of units (SI) with respect to extension difference E is I units, and an I unit is 10 equivalent to length difference-5, put down
Straight degree index can represent with the ratio between the waveform height of strip warpage waveform and waveform length, i.e. angularity
λ=R/L；It is also possible that calculate：Δ L/L=(π R/2L)2；In formula：R：Waveform height, mm；L：Ripple
Shape length, mm.
Strip crown Ch：Thickness and a certain difference for representing thickness at point of edge at center are defined as on plate cross section,
Including absolute convexity, relative convexity and ratio convexity.Wherein, absolute convexity ChEqual to strip cross section intermediate point
Thickness hcSubtract edge thickness he, edge thickness heTypically take apart from edge 50mm positions strip both sides average value
Thickness.With respect to convexity CREqual to absolute convexity ChAccount for intermediate point thickness hcPercentage；Ratio convexity CPEqual to exhausted
To convexity ChThe ratio between with rolled piece average thickness h.I.e.：Absolute convexity Ch=hc-he；With respect to convexity CR=hc-he/hc
* 100%；Ratio convexity CP=Ch/h。Ch、hc、he、CR、CPUnit, it is mm.
In specific implementation process, flatness defect and Producing reason are found：
Flatness defect Producing reason：Essence is the skewness of band internal residual stress, its performance directly perceived
For strip wave type, wooden dipper song etc., the stress form on its strip cross section of different plate shapes is different, this stress
Form can accurately reflect the actual conditions of plate shape, and flatness defect is as follows：
Arranged on strip：(1) side wave, (2) transmission side wave are operated；Arranged in strip：(1) bilateral wave,
(2) middle wave；Arranged under strip：(1) complex seas, (2) rib wave.
Good profile condition and the factor for influenceing strip crown：
Good plate shape will be by the physical property of rolled piece in itself (such as：Resistance of deformation) and rolling condition is (such as：
Power, lubrication) etc. several factors influence.Good profile to be obtained, it is necessary to assure strip transversely has uniformly
Extension.Phase " matching " between supplied materials cross-sectional geometry and the geometry for carrying roll gap is ensuring that, makes band
Dimension scale is constant everywhere with rolling rear section before the rolling of steel, and ratio convexity difference is zero.
The strip crown index and glacing flatness index of strip are close ties and interactional, the control of strip flatness
Finally sum up in the point that in the control of mill roll-gap shape (strip crown).
The factor of influence strip crown is a lot, and key factor has：
(1) roll elastic bending deflection caused by rolling loads；
(2) roller surface flattening deformation caused by rolling loads；
(3) the thermal expansion of rollers deformation of the operation of rolling；
(4) roll wear of the operation of rolling.
The ultra-thin CVC milling trains plate shape control process of the present invention is as follows：
The roller CVC milling trains of single chassis 6 are respectively matched somebody with somebody using contact testing technique for shape of strip, inlet of rolling mill, outlet
There are two sets of plate profile instrument detecting systems.The plate shape roller configured is using the overall body of roll, the structure side of segmentation pressure sensitive
Formula, every section of the plate shape roller only pressure sensor, one signal of the feedback that often rotates a circle.Pressure sensor
Detect strip each section of pressure in the direction of the width, pressure size with the power of output electric signal embody.Then,
According to calculation formula by conversion pressure into strip internal stress size, finally at computer HMI interfaces with curve
Form shows the actual conditions of plate shape.
As shown in Fig. 2 the roller CVC milling trains of single chassis 6 carry out flatness detection, working roll and centre by plate profile instrument
Hydraulic bending roll, hydraulic pressing cylinder inclination control, intermediate calender rolls CVC axial movements (string roller), the working roll EDC of roller
Axial movement (string roller), emulsion Local cooling etc. together constitute milling train plate shape online feedback closed-loop control system.
Processing passage is calculated according to raw material parameter milling train automatically first, in the operation of rolling, such as working roll, middle roll bending
In the case of the regulation of roller power disclosure satisfy that Strip Shape Control, CVC rollers are without play.When incoming profile change causes
When working roll, intermediate calender rolls bending roller force reach the 70-80% that it controls maximum capacity, CVC rollers proceed by dynamic
Adjustment, change roll gap profile convexity, improve milling train plate shape control ability and avoid bringing because using big bending roller force again
Negative effect to Strip Shape Control.
In the strip profile and flatness that the entrance and exit of milling train is detected by plate shape roller, it is processed into through mathematical analysis flat
Straight line of writing music, it represents the difference of strip profile and flatness desired value and actual value, and the difference is categorized as through mathematical modeling
Once, secondary, four times and the equation of higher degree major defect, is respectively transmitted to corresponding Strip Shape Control executing agency.
General hydraulic pressing cylinder inclination control (solving once linear defect), work roll bending (solve conic section
Defect), intermediate calender rolls play and middle roll bending (solving biquadratic parabola defect), it is remaining it is small, complicated,
Asymmetrical defect is solved by sub-sectional cooling system.High sublinear equation control mode make working roll, intermediate calender rolls,
Contact load between backing roll is uniform and symmetrical, milling train plate shape control ability is greatly enhanced.
As shown in figure 3, work roll bending, middle roll bending and CVC regulations can efficiently control it is secondary and four
Secondary convexity (C2 and C4)：Strip steel at entry C2 and C4 numerical value is predicted, can be with according to plate shape good condition
Calculate the corresponding convex value of outlet strip.Then computer system consider roll neck, roll thermal crown change etc. it is a variety of because
The regulation for calculating work roll bending, middle roll bending, CVC shifting amounts under the premise of element according to preset model is set
Value.With CVC plays, secondary convexity changes in the range of 0.00-0.80mm.
In the present invention, roll-force, tension force, moment of torsion and coefficient of friction, the reaction force relation of roller：
Spindle drive and roller transmission are connected all there is moment of torsion, moment of torsion is exactly that longitudinal force is transformed into cross force.
Into after roll gap, after yield point, band is in flow regime, retrospective deformation is produced, in yield strength scope
Interior, deformation tendency is increasing.The moment of torsion of roller is transformed into frictional force, and frictional force is done along rolling direction transmission
A work(part be transformed into heat, with rolling direction, deflection is increasing, and the time is fewer and fewer, speed
It is more and more faster.And heat some be emulsified liquid band and walk.
In the present invention, the change of strip width (is opened to roll-force, power of motor, strip temperature, advancing slip influence
On the premise of power is constant)：
On the premise of deflection is certain, width increase, roll-force increase.
On the premise of deflection is certain, width increase, power increase.
On the premise of deflection is certain, width increases, and temperature is constant.
On the premise of deflection is certain, width increase is advancing slip constant.
On the premise of width is certain, reduction ratio increase, roll-force increase.
On the premise of width is certain, reduction ratio increase, power increase.
On the premise of width is certain, reduction ratio increase, temperature increase.
On the premise of width is certain, reduction ratio increase, advancing slip increase.
In strip and the contact start of working roll, the resistance of deformation moment of working roll increases, as roll-force increases,
The deflection increase of strip, the resistance of deformation of working roll also begins to increase, until contact of the strip with working roll
Neutral point region, the resistance of deformation of working roll increase to maximum, when the thickness of later strip tends towards stability constant,
The resistance of deformation of working roll starts to reduce, until for zero.The contact arc of reduction ratio increase, working roll and strip increases
Add, and deflection is big, and the resistance of deformation of neutral point regional work roller also accordingly increases.
In the present invention, the thickness change of strip steel at entry is to roll-force, motor power, strip temperature, advancing slip shadow
Ring (on the premise of constant tension)：
In strip steel at entry≤0.43mm, thickness increase, roll-force is reduced.
In strip steel at entry >=0.43mm, thickness increase, roll-force increase.
On the premise of deflection is certain, thickness increase, power increase.
On the premise of deflection is certain, thickness increase, temperature is basically unchanged.
On the premise of deflection is certain, thickness increase, advancing slip trend reduces.
On the premise of thickness is certain, reduction ratio increase, roll-force increase.
On the premise of thickness is certain, reduction ratio increase, power increase.
On the premise of thickness is certain, reduction ratio increase, temperature increase.
On the premise of thickness is certain, reduction ratio increase, advancing slip corresponding increase.
In strip and the contact start of working roll, the resistance of deformation moment of working roll increases, and band is thinner, contact
Arc is shorter, and contact area is smaller, and as belt steel thickness increases, the contact arc of strip and working roll gradually increases,
With the deflection increase of strip, the resistance of deformation of working roll also begins to increase, until strip and working roll
Neutral point region is contacted, the resistance of deformation of working roll increases to maximum, tended towards stability not in the thickness of later strip
During change, the resistance of deformation of working roll starts to reduce, until for zero.Reduction ratio increase, working roll and strip connect
Arc increase is touched, and deflection is big, and the resistance of deformation of neutral point regional work roller also accordingly significantly increases.
In the present invention, the firmness change of strip (is opened to roll-force, motor power, strip temperature, advancing slip influence
On the premise of power is constant)：
On the premise of deflection is certain, hardness increase, roll-force increase.
On the premise of deflection is certain, hardness increase, power increase.
On the premise of deflection is certain, hardness increase, temperature increase.
On the premise of deflection is certain, hardness increase, advancing slip increase.
On the premise of hardness is certain, reduction ratio increase, roll-force increase.
On the premise of hardness is certain, reduction ratio increase, power increase.
On the premise of hardness is certain, reduction ratio increase, temperature increase.
On the premise of hardness is certain, reduction ratio increase, advancing slip increase.
In strip and the contact start of working roll, the resistance of deformation moment of working roll increases, as strip hardness increases
Greatly, the contact arc of strip and working roll gradually increases, and is reduced with the gap values between rollers of working roll, the deformation of working roll
Drag also begins to increase, until contact neutral point region of the strip with working roll, the resistance of deformation of working roll increases
Maximum is added to, when the thickness of later strip tends towards stability constant, the resistance of deformation of working roll starts to reduce, directly
To for zero.The contact arc increase of reduction ratio increase, working roll and strip, and deflection is big, neutral point region
The resistance of deformation of working roll also accordingly significantly increases.
In the present invention, the change of work roll diameter is to roll-force, motor power, strip temperature, advancing slip influence
(on the premise of constant tension)：
On the premise of deflection is certain, work roll diameter increase, roll-force increase.
On the premise of deflection is certain, work roll diameter increase, power increase.
On the premise of deflection is certain, work roll diameter increase, temperature is basically unchanged.
The contact arc of work roll diameter increase, strip and working roll gradually increases, temperature rise, but contact arc
Greatly, the heat taken away is also more, so temperature is basically unchanged.
On the premise of deflection is certain, work roll diameter increase, advancing slip increase.
On the premise of work roll diameter is certain, reduction ratio increase, roll-force increase.
On the premise of work roll diameter is certain, reduction ratio increase, power increase.
On the premise of work roll diameter is certain, reduction ratio increase, temperature increase.
On the premise of work roll diameter is certain, reduction ratio increase, advancing slip increase.
In strip and the contact start of working roll, the resistance of deformation moment of working roll increases, with strip working roll
Diameter increases, and the contact arc of strip and working roll gradually increases, and is reduced with the gap values between rollers of working roll, working roll
Resistance of deformation also begin to increase, until contact neutral point region of the strip with working roll, the deformation of working roll
Drag increases to maximum, and when the thickness of later strip tends towards stability constant, the resistance of deformation of working roll starts to subtract
It is few, until for zero.The contact arc increase of reduction ratio increase, working roll and strip, and deflection is big, it is neutral
The resistance of deformation of point regional work roller also accordingly significantly increases.
In the present invention, the change of mill speed (is opened to roll-force, motor power, strip temperature, advancing slip influence
On the premise of power is constant)：
On the premise of deflection is certain, mill speed increase, roll-force is reduced.
On the premise of deflection is certain, mill speed increase, power increase.
On the premise of deflection is certain, mill speed increase, temperature is reduced.
On the premise of deflection is certain, mill speed increase, advancing slip reduction.
On the premise of mill speed is certain, reduction ratio increase, roll-force increase.
On the premise of mill speed is certain, reduction ratio increase, power increase.
On the premise of mill speed is certain, reduction ratio increase, temperature increase.
On the premise of mill speed is certain, reduction ratio increase, advancing slip increase.
In strip and the contact start of working roll, the resistance of deformation moment of working roll increases, with belt steel rolling speed
The contact arc of degree increase, strip and working roll is basically unchanged, and is reduced with the gap values between rollers of working roll, working roll
Resistance of deformation also begins to increase, until contact neutral point region of the strip with working roll, the deformation of working roll resist
Power increases to maximum, and when the thickness of later strip tends towards stability constant, the resistance of deformation of working roll starts to reduce,
Until for zero.The contact arc increase of reduction ratio increase, working roll and strip, and deflection is big, neutral point area
The resistance of deformation of domain working roll also accordingly significantly increases.
In the present invention, entrance tension variation is to roll-force, motor power, strip temperature, advancing slip influence：
On the premise of deflection is certain, entrance tension force increase, roll-force is reduced.
On the premise of deflection is certain, the increase of entrance tension force, power increase.
On the premise of deflection is certain, entrance tension force increase, temperature is somewhat reduced.
On the premise of deflection is certain, the increase of entrance tension force, advancing slip reduction.
On the premise of entrance tension force is certain, reduction ratio increase, roll-force increase.
On the premise of entrance tension force is certain, reduction ratio increase, power increase.
On the premise of entrance tension force is certain, reduction ratio increase, temperature increase.
On the premise of entrance tension force is certain, reduction ratio increase, advancing slip increase.
In strip and the contact start of working roll, the resistance of deformation moment of working roll increases, with strip entrance
Power increases, and the contact arc of strip and working roll is basically unchanged, and is reduced with the gap values between rollers of working roll, working roll
Resistance of deformation also begins to increase, until contact neutral point region of the strip with working roll, the deformation of working roll resist
Power increases to maximum, and when the thickness of later strip tends towards stability constant, the resistance of deformation of working roll starts to reduce,
Until for zero.The contact arc increase of reduction ratio increase, working roll and strip, and deflection is big, neutral point area
The resistance of deformation of domain working roll also accordingly significantly increases.
In the present invention, outlet tension variation is to roll-force, motor power, strip temperature, advancing slip influence：
On the premise of deflection is certain, outlet tension force increase, roll-force is reduced.
On the premise of deflection is certain, outlet tension force increase, power is reduced.
On the premise of deflection is certain, outlet tension force increase, temperature is basically unchanged.
On the premise of deflection is certain, outlet tension force increase, advancing slip increase.
On the premise of outlet tension force is certain, reduction ratio increase, roll-force increase.
On the premise of outlet tension force is certain, reduction ratio increase, power increase.
On the premise of outlet tension force is certain, reduction ratio increase, temperature increase.
On the premise of outlet tension force is certain, reduction ratio increase, advancing slip increase.
In strip and the contact start of working roll, the resistance of deformation moment of working roll increases, with strip outlet
Power increases, and the contact arc of strip and working roll is basically unchanged, and is reduced with the gap values between rollers of working roll, working roll
Resistance of deformation also begins to increase, until contact neutral point region of the strip with working roll, the deformation of working roll resist
Power increases to maximum, and when the thickness of later strip tends towards stability constant, the resistance of deformation of working roll starts to reduce,
Until for zero.The contact arc increase of reduction ratio increase, working roll and strip, and deflection is big, neutral point area
The resistance of deformation of domain working roll also accordingly significantly increases.
In the present invention, the common change of inlet/outlet tension force is to roll-force, motor power, strip temperature, advancing slip
Influence：
On the premise of deflection is certain, inlet/outlet tension force increase, roll-force is reduced.
On the premise of deflection is certain, inlet/outlet tension force increase, power is reduced.
On the premise of deflection is certain, inlet/outlet tension force increase, temperature is somewhat reduced.
On the premise of deflection is certain, the increase of inlet/outlet tension force, advancing slip relative reduction.
On the premise of inlet/outlet tension force is certain, reduction ratio increase, roll-force increase.
On the premise of inlet/outlet tension force is certain, reduction ratio increase, power increase.
On the premise of inlet/outlet tension force is certain, reduction ratio increase, temperature increase.
On the premise of inlet/outlet tension force is certain, reduction ratio increase, advancing slip increase.
Tension force is bigger, and roll-force is smaller.Big tension force is beneficial to depressing, and inlet/outlet tension force is certain, maintaining roller
Son is stable
In strip and the contact start of working roll, the resistance of deformation moment of working roll increases, with strip inlet/outlet
Tension force increases, and the contact arc of strip and working roll is basically unchanged, and is reduced with the gap values between rollers of working roll, working roll
Resistance of deformation also begin to increase, until contact neutral point region of the strip with working roll, the deformation of working roll
Drag increases to maximum, and when the thickness of later strip tends towards stability constant, the resistance of deformation of working roll starts to subtract
It is few, until for zero.The contact arc increase of reduction ratio increase, working roll and strip, and deflection is big, it is neutral
The resistance of deformation of point regional work roller also accordingly significantly increases.
In the present invention, frictional force is to roll-force, motor power, strip temperature, advancing slip influence：
On the premise of deflection is certain, frictional force increase, roll-force increase.
On the premise of deflection is certain, frictional force increase, power increase.
On the premise of deflection is certain, frictional force increase, temperature increase.
On the premise of deflection is certain, frictional force increase, advancing slip increase.
On the premise of frictional force is certain, reduction ratio increase, roll-force increase.
On the premise of frictional force is certain, reduction ratio increase, power increase.
On the premise of frictional force is certain, reduction ratio increase, temperature increase.
On the premise of frictional force is certain, reduction ratio increase, advancing slip increase.
In strip and the contact start of working roll, the resistance of deformation moment of working roll increases, with strip frictional force
The contact arc of increase, strip and working roll somewhat increases, and is reduced with the gap values between rollers of working roll, the change of working roll
Shape drag also begins to increase, until contact neutral point region of the strip with working roll, the resistance of deformation of working roll
Increase to maximum, when the thickness of later strip tends towards stability constant, the resistance of deformation of working roll starts to reduce,
Until for zero.The contact arc increase of reduction ratio increase, working roll and strip, and deflection is big, neutral point area
The resistance of deformation of domain working roll also accordingly significantly increases.
In the present invention, reduction ratio is to roll-force, motor power, strip temperature, advancing slip influence：
On the premise of deflection is certain, reduction ratio increase, roll-force increase.
On the premise of deflection is certain, reduction ratio increase, power increase.
On the premise of deflection is certain, reduction ratio increase, temperature increase.
On the premise of deflection is certain, reduction ratio increase, advancing slip increase.
On the premise of reduction ratio is certain, reduction ratio increase, roll-force increase.
On the premise of reduction ratio is certain, reduction ratio increase, power increase.
On the premise of reduction ratio is certain, reduction ratio increase, temperature increase.
On the premise of reduction ratio is certain, reduction ratio increase, advancing slip increase.
In strip and the contact start of working roll, the resistance of deformation moment of working roll increases, with strip frictional force
The contact arc increase of increase, strip and working roll, is reduced, the deformation of working roll resists with the gap values between rollers of working roll
Power also begins to increase, until contact neutral point region of the strip with working roll, the resistance of deformation increase of working roll
To maximum, when the thickness of later strip tends towards stability constant, the resistance of deformation of working roll starts to reduce, until
It is zero.The contact arc increase of reduction ratio increase, working roll and strip, and deflection is big, neutral point region work
The resistance of deformation for making roller also accordingly significantly increases.
The technical indicator of Strip Shape Control of the present invention is as follows：
The measurement of the actual shape wave of the present invention, takes 10 pieces of models, is placed on and checks on platform, carries out unrestrained high and long wave
Measurement, average gradient rate 0.92%, the average high 4.2mm of wave, meet the technical requirements.
Embodiment result shows that the application of CVC control technologies of the present invention strengthens milling train plate shape control ability,
There is good adaptability to the product of different cultivars, specification, can be to roll dressing and roll in the operation of rolling
Roll thermal crown compensates, and milling train product has good glacing flatness and surface quality, and due to using unification
CVC curves, roll is set to be reduced for roller quantity, so as to reduce production cost, with ultra-thin milling train CVC skills
Abundant and maturation, the product plate shape of art have obtained steady raising.
Claims (6)
1. a kind of cold rolling superthin CVC board-shape control methods, it is characterised in that detailed process is as follows：
Using the roller CVC milling train contact testing technique for shape of strip of single chassis 6, inlet of rolling mill, outlet are respectively furnished with two
Cover plate profile instrument detecting system；The plate shape roller configured uses the overall body of roll, is segmented the frame mode of pressure sensitive,
Every section of the plate shape roller only pressure sensor, one signal of the feedback that often rotates a circle；Pressure sensor detects
Strip each section of pressure in the direction of the width, pressure size with the power of output electric signal embody.
2. according to the cold rolling superthin CVC board-shape control methods described in claim 1, it is characterised in that according to
Calculation formula by conversion pressure into strip internal stress size, finally interface at computer HMI in graph form
Show the actual conditions of plate shape.
3. according to the cold rolling superthin CVC board-shape control methods described in claim 1, it is characterised in that unit
The roller CVC milling trains of frame 6 are carried out hydraulic bending roll, the hydraulic pressure pressure of flatness detection, working roll and intermediate calender rolls by plate profile instrument
Lower cylinder inclination control, intermediate calender rolls CVC axial movements, working roll EDC axial movements, emulsion Local cooling
Collectively form milling train plate shape online feedback closed-loop control system.
4. according to the cold rolling superthin CVC board-shape control methods described in claim 1, it is characterised in that first
Processing passage calculated according to raw material parameter milling train automatically, in the operation of rolling, working roll, intermediate calender rolls bending roller force
In the case of regulation disclosure satisfy that Strip Shape Control, CVC rollers are without play；When incoming profile change cause working roll,
When intermediate calender rolls bending roller force reaches the 70-80% that it controls maximum capacity, CVC rollers proceed by dynamic and adjusted, and change
Become roll gap profile convexity, improve milling train plate shape control ability and avoid bringing to plate shape control because using big bending roller force again
The negative effect of system.
5. according to the cold rolling superthin CVC board-shape control methods described in claim 1, it is characterised in that rolling
The strip profile and flatness that the entrance and exit of machine is detected by plate shape roller, glacing flatness curve is processed into through mathematical analysis,
It represents the difference of strip profile and flatness desired value and actual value, the difference is categorized as once through mathematical modeling, is secondary,
Four times and the major defect of the equation of higher degree, it is respectively transmitted to corresponding Strip Shape Control executing agency.
6. according to the cold rolling superthin CVC board-shape control methods described in claim 1, it is characterised in that hydraulic pressure
Pressure cylinder inclination control solves once linear defect, work roll bending solves conic section defect, intermediate calender rolls play
Solves biquadratic parabola defect with middle roll bending, remaining small, complicated, asymmetrical defect is cold by being segmented
But system solves；High sublinear equation control mode makes the contact load between working roll, intermediate calender rolls, backing roll
It is uniform and symmetrical, strengthen milling train plate shape control ability.
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| CN112246879A (en) * | 2020-08-17 | 2021-01-22 | 唐山钢铁集团有限责任公司 | Method for improving wedge-shaped dynamic control precision of hot-rolled strip steel by using feedback data |
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| CN112246879A (en) * | 2020-08-17 | 2021-01-22 | 唐山钢铁集团有限责任公司 | Method for improving wedge-shaped dynamic control precision of hot-rolled strip steel by using feedback data |
| CN112453053B (en) * | 2020-09-28 | 2023-07-11 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Strip steel lifting eliminating method for finishing machine in production of thin-specification and extremely-thin-specification strip steel |
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| CN113522987B (en) * | 2021-06-25 | 2022-04-08 | 广东含元工业技术有限公司 | Cold rolling mill with convexity control device and control method |
| CN113522987A (en) * | 2021-06-25 | 2021-10-22 | 广东含元工业技术有限公司 | Cold rolling mill with convexity control device and control method |
| CN114632820A (en) * | 2022-03-04 | 2022-06-17 | 南京工程学院 | Working roll shape design method for cold rolling and ultrathin aluminum foil cold rolling shape control method |
| CN114632820B (en) * | 2022-03-04 | 2023-11-10 | 南京工程学院 | Work roll shape design method for cold rolling and ultrathin aluminum foil cold-rolled sheet shape control method |
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Application publication date: 20171208 |