CN102756013A - Improving method and device for warping of cold-rolled strip steel - Google Patents

Abstract

The invention relates to an improving method for the warping of cold-rolled strip steel. A warping control device is arranged at an outlet of a temper mill. The improving method is characterized in that a roll A and a fixing roll B are respectively taken as an upper roll and a lower roll of the warping control device, wherein the height of the roll A can be adjusted in the vertical direction, the improving method comprises the following steps of: 1. collecting the equipment parameters of the temper mill, and determining the distance between the temper mill and a BQK device; 2. determining the equipment parameters of the BQK device, and mainly determining the diameter of the roll A; 3. collecting the characteristic parameters of flattening strip steel, wherein the characteristic parameters comprise Young modulus of strip steel to be flattened and the thickness and width of the strip steel; 4. measuring the warping height delta H of the flattening strip steel at the exit; 5. calculating the cutting depth d of the roll A of the BQK device according to iteration; and 6. adjusting the height of the roll A according to the calculated cutting depth d. According to the improving method, the control effects of two warping control technologies for straightening and adjusting rolling wrap angles are simultaneously realized, thereby eliminating the warping defect of the flattened strip steel at high efficiency.

Description

A kind of improvement method and device of cold-strip steel warpage

Technical field

The present invention relates to the metallurgy rolling field, concrete, the present invention relates to a kind of improvement method and device of cold-strip steel warpage.

Background technology

The strip steel plays important effect as one of most important product of steel and iron industry in the national economic development.It all has extremely widely in industry, agricultural, national defence and daily life uses.Along with developing rapidly of modern industry and science and technology, the users of industrial enterprise have proposed more and more stricter requirement to the quality of strip steel.

Warpage and plate shape are one of important indicators of weighing band steel shape.In recent years, along with the continuous development of plate shape theory and plate shape control technology is perfect, the plate shape level of band steel obtains considerable raising, can satisfy user's requirement basically.But the development of band steel warpage control technology is but very slow, and present stage, the warpage defective of cold-strip steel has become the cold rolling production of puzzlement and particularly rolled one of main Quality of back subsequent treatment production.

The warpage defective form of band steel comprises that C sticks up, L sticks up, turn round and stick up etc., and it produces reason is that inside exists certain inhomogeneous residual stress, after it reaches the critical instability condition of band steel, warpage will take place.The strip production development is to today, and the technology that is specifically designed to warpage control is not a lot, following three kinds of control technologys mainly occur:

● the The straightener control warpage

● stretching-bending straightener control warpage

● change planisher cornerite control warpage

In the means of above-mentioned three kinds of control band steel warpages, straightener is identical with the control principle of straightening machine, and the control effect is apparent in view, and still, shortcoming is to need a special process procedure and the relevant major-minor equipment of increasing, and invests bigger.The Baosteel patent No. 200520043022.2 once proposed a kind of anti-device that sticks up of continuous annealing unit; Through anti-ly sticking up the band steel warpage straightening mechanism that roller is realized approximate straightening function increasing by one apart from the position of idler roller close together, shown in Figure 1, its scheme aligning with independent on the principle is identical; Drop into less relatively; But because cornerite is less, and lack the recurvation link, it is limited therefore to control effect.

The cornerite of the change formation process that passes through theoretically, can directly change the relative deformation degree of band steel upper and lower surfaces.But because planisher cornerite adjustable range is less, so the effect of this means improvement band steel warpage is very limited.

Summary of the invention

For overcoming the problems referred to above; The objective of the invention is to: improvement method and device that a kind of cold-strip steel warpage is provided; According to the improvement method and the device of cold-strip steel warpage according to the invention, aligning is combined with the technical advantage that changes rolling cornerite, develop a kind of special device that is installed in milling train or planisher outlet; Realize aligning and adjusting the control effect of these two kinds of warpage control technologys of rolling cornerite simultaneously, thereby efficiently eliminate the warpage defective of smooth back band steel.The design's main feature is that effect is obvious near rolling outlet; Simultaneously, adjustment equipment is simple, and small investment is taken up an area of few.

For achieving the above object, technical scheme of the present invention is following:

A kind of improvement method of cold-strip steel warpage is characterized in that, warpage control device (BQK device) is set in the planisher exit, and said warpage control device comprises: be up-down rollers with the roller A and the stationary roll roller B that can regulate height in vertical direction respectively,

Step 1 is collected the device parameter of smooth unit, collects the distance between smooth unit and BQK device, and smooth unit and BQK device space are 30mm-3000mm from scope,

Step 2: collect the device parameter of BQK device, comprising:

Collect the diameter of A roller, the diameter D scope of roller A is following;

$0.1D_t\≤D\≤0.5\frac{\mathrm{\δE}}{{\mathrm{\δ}}_S}---\left(1\right)$

In the formula, δ---band steel minimum thickness;

σ _S---band steel yield limit,

D _t---the planisher work roll diameter,

E---Young's modulus,

The roll surface length L of roller A _ASatisfy following relational expression:

1.1B _max≤L _A≤1.6B _max (2)

In the formula, B _Max---band steel Breadth Maximum,

Step 3: collect the characterisitic parameter of smooth band steel, said characterisitic parameter comprises: the thickness and the width of the Young's modulus of smooth band steel, band steel; Above-mentioned parameter is mainly used in the calculating of step 5, and wherein Young's modulus E is used for calculating parameter K ₁, belt steel thickness and width all are that step 5 is calculated used indispensable parameter;

Step 4: the depth of camber Δ H:0-200mm that records smooth outlet band steel;

Step 5: according to formula

$\mathrm{\&Delta;H}=k_4\&CenterDot;{\sin }^2\left(\frac{b(K_1{\mathrm{<figure-callout\; id="2"\; label="d"\; filenames="HDA0000057728870000012.png,HDA0000057728870000042.png"\; state="\{\{state\}\}">d</figure-callout>}}^2+K_{2}d+C)}{2h}\right)\&times;\left(\frac{h}{K_1{\mathrm{<figure-callout\; id="2"\; label="d"\; filenames="HDA0000057728870000012.png,HDA0000057728870000042.png"\; state="\{\{state\}\}">d</figure-callout>}}^2+K_{2}d+C}\right)$

In the formula;

rolling cornerite changes the influence coefficient to warpage, value 0-1;

${\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="HDA0000057728870000012.png,HDA0000057728870000042.png"\; state="\{\{state\}\}">K</figure-callout>}}_2={\mathrm{<figure-callout\; id="1"\; label="k"\; filenames="HDA0000057728870000011.png,HDA0000057728870000023.png"\; state="\{\{state\}\}">k</figure-callout>}}_1\&times;a-\frac{k_{3}D}{E};$ $C=\frac{c_2}{E}-{\mathrm{<figure-callout\; id="1"\; label="c"\; filenames="HDA0000057728870000011.png,HDA0000057728870000023.png"\; state="\{\{state\}\}">c</figure-callout>}}_1,$

B---the width of band steel, m is from step 3;

E---the Young's modulus of band steel, MPa is from step 3;

D---the diameter of BQK device A roller, m;

D---the penetraction depth of BQK device A roller, m;

A---rolling cornerite adjustment coefficient, 1/m;

H---belt steel thickness, m is from step 3;

k ₂, k ₃, c ₂---regression coefficient, span is respectively 0-5 ,-50-50,0-500;

L---the BQK device is to the distance of planisher, m;

c ₁---constant term, interval are 0-1;

k ₄---influence coefficient, span-20-20.

Iterative computation goes out the penetraction depth of BQK device A roller;

Step 6: according to the penetraction depth d that step 5 calculates, the height of adjustment A roller.

In step 1, collect the device parameter of smooth unit, collect the distance between smooth unit and BQK device; Smooth unit and BQK device space are [300mm from scope; 1000mm], select according to for the BQK device as far as possible with planisher near, but to guarantee be not and the planisher normal running does not interfere with the planisher roller; BQK device and planisher distance can not be far away excessively simultaneously; According to the field adjustable experience, after BQK device and planisher distance was greater than 3000mm, the regulating action of then rolling cornerite being regulated was very little; In step 2: the range of choice of the diameter D of roller A need satisfy following relational expression could guarantee that plastic deformation takes place the band steel through roller A the time,

$0.1D_t\&le;D\&le;0.5\frac{\mathrm{\&delta;E}}{{\mathrm{\&sigma;}}_S}---\left(1\right)$

In step 3: collect the characterisitic parameter of smooth band steel, said characterisitic parameter comprises: the thickness and the width of the Young's modulus of smooth band steel, band steel.Above-mentioned parameter is mainly used in the calculating of step 5, and wherein Young's modulus E is used for calculating parameter K ₁, belt steel thickness and width all are that step 5 is calculated used indispensable parameter.

In step 4: as shown in Figure 9; Use band steel C to stick up measuring instrument or the mode through manual measurement; Obtain the depth of camber Δ H (the actual depth of camber of band steel receives many-sided factor affecting, and unfixing, scope is generally between 0-200mm) of smooth outlet band steel.

In step 5: according to formula

$\mathrm{\&Delta;H}=k_4\&CenterDot;{\sin }^2\left(\frac{b(K_1{\mathrm{<figure-callout\; id="2"\; label="d"\; filenames="HDA0000057728870000012.png,HDA0000057728870000042.png"\; state="\{\{state\}\}">d</figure-callout>}}^2+K_{2}d+C)}{2h}\right)\&times;\left(\frac{h}{K_1{\mathrm{<figure-callout\; id="2"\; label="d"\; filenames="HDA0000057728870000012.png,HDA0000057728870000042.png"\; state="\{\{state\}\}">d</figure-callout>}}^2+K_{2}d+C}\right)$

In the formula;

rolling cornerite changes the influence coefficient to warpage; Interval is [0,1];

${\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="HDA0000057728870000012.png,HDA0000057728870000042.png"\; state="\{\{state\}\}">K</figure-callout>}}_2={\mathrm{<figure-callout\; id="1"\; label="k"\; filenames="HDA0000057728870000011.png,HDA0000057728870000023.png"\; state="\{\{state\}\}">k</figure-callout>}}_1\&times;a-\frac{k_{3}D}{E};$ $C=\frac{c_2}{E}-{\mathrm{<figure-callout\; id="1"\; label="c"\; filenames="HDA0000057728870000011.png,HDA0000057728870000023.png"\; state="\{\{state\}\}">c</figure-callout>}}_1.$

B---the width of band steel, m is from step 3;

E---the Young's modulus of band steel, MPa is from step 3;

D---the diameter of BQK device A roller, m;

D---the penetraction depth of BQK device A roller, m;

A---rolling cornerite adjustment coefficient, 1/m;

H---belt steel thickness, m is from step 3;

k ₂, k ₃, c ₂---regression coefficient, span are respectively [0,5], [50,50], [0,1000];

L---the BQK device is to the distance of planisher, m;

c ₁---constant term, interval are [0,1];

k ₄---influence coefficient, span [20,20].

Each coefficient, parameter all are that the recurrence of finite element simulation result of calculation combines the field adjustable empirical data to confirm simultaneously in the formula.

When iterative computation went out the penetraction depth d of BQK device A roller, penetraction depth was also claimed insertion depth, when the A roller does not contact with the strip or just contacted with the strip and when not having interaction force, the side-looking of band steel is straight line between roller B and planisher.Definition A roller has just contacted with the strip and has been penetraction depth 0 point when not having interaction force; When roller A moves a distance, d d; The band steel bends between roller B and planisher (exist contact action power between roller A and band steel this moment) just claims that roller A cuts or insertion band steel thereby make, and corresponding dd is exactly the penetraction depth of roller A this moment, and is shown in figure 10; Blueness is the original state of roller A and band steel, and black is end-state.

In step 6: according to the penetraction depth d that step 5 calculates, the adjusting of the height of adjustment A roller is shown in figure 10, and the penetraction depth d that calculates according to step 5 increases or reduce the height dd that steel is with in the incision of A roller; Accomplishing the present invention to this regulates the improvement of cold-strip steel warpage.

Iterative computation is a kind of mathematic calculation of finding the solution implicit function.We will find the solution the penetraction depth d of BQK device A roller according to the band steel warpage of actual measurement in the step 5; But be difficult to obtain the function of penetraction depth d about band steel warpage; What obtain easily is the function of band steel warpage about penetraction depth d, therefore need find the solution through the method for iterative computation.

The method of iterative computation is a lot; Specific to the present invention, can adopt dichotomy to find the solution, solution procedure is; At first the formula according to step 5 calculates the corresponding band steel warpage regulation and control amount of maximum penetraction depth; If actual measurement warpage defective has surpassed this value, explain that then this warpage has surpassed the regulating power scope under present case, can't regulate.If this moment, warpage was in modification scope, then search for best penetraction depth d through alternative manner, concrete search procedure is following, when the penetraction depth that circulates for the k time is taken as d ^k, the eccentricity interval does Relatively according to d ^kThe relation of band steel warpage of calculating and actual measurement warpage is confirmed the penetraction depth interval of the k+1 time circulation time.If result of calculation is greater than actual conditions; Then interval is otherwise; Then interval be the penetraction depth value of

corresponding the k+1 time circulation time for

when the deviation of certain result of calculation and measured value less than measured value 1% the time, stop calculating.

The device that improves according to a kind of cold-strip steel warpage of the present invention is characterized in that, said smooth unit and BQK device space are 300-1000mm from scope.

The device that improves according to a kind of cold-strip steel warpage of the present invention is characterized in that, said planisher work roll diameter is 300-400mm.

The device that improves according to a kind of cold-strip steel warpage of the present invention is characterized in that, the diameter of said BQK device A roller is 40-100mm.

The device that improves according to a kind of cold-strip steel warpage of the present invention is characterized in that, said BQK device is 300-1000mm to the distance L of planisher.

The device that improves according to a kind of cold-strip steel warpage of the present invention is characterized in that, said c ₁The constant term interval is 0-1.

The device that improves according to a kind of cold-strip steel warpage of the present invention is characterized in that, said k ₄Influence coefficient span-20-20.

Core of the present invention is the warpage control device that a cover is installed in the planisher outlet, called after BQK device.It is made up of two rollers, and is as depicted in figs. 1 and 2.Its central roll A can regulate height in vertical direction, and roller B is a stationary roll.Specific requirement is following:

(1) the aligning condition is satisfied with distance relation in the roller of roller A and roller B footpath.

(2) the rolling cornerite between the roller A adjustment of height in vertical direction should be able to change planisher working roll and band steel.

(3) according to the difference of the planisher kind of drive, roller A is different with the arrangement of roller B, and when planisher adopted the independent transmission of lower roll, roller A was arranged in band steel downside, and roller B is arranged in band steel upside, and the pivot of roller B is apart from height of rolling line H _BGuarantee to be the radius of roller B, promptly roller B influence of rolled line height not is shown in Figure 2; When adopting the independent transmission of top roll, roller A is arranged in band steel upside, and roller B is arranged in band steel downside, and the pivot of roller B is apart from height of rolling line H _BGuarantee to be the radius of roller B, promptly roller B influence of rolled line height not is shown in Figure 3; When planisher adopts up and down separate transmission, then there is not specific (special) requirements.

The range of choice of the diameter D of roller A need satisfy following relational expression could guarantee that plastic deformation takes place the band steel through roller A the time,

$0.1D_t\&le;D\&le;0.5\frac{\mathrm{\&delta;E}}{{\mathrm{\&delta;}}_S}---\left(1\right)$

In the formula, δ---band steel minimum thickness;

σ _S---band steel yield limit,

D _t---the planisher work roll diameter.

The roll surface length L of roller A _ANeed satisfy following relational expression,

1.1B _max≤L _A≤1.6B _max (2)

In the formula, B _Max---band steel Breadth Maximum,

The operation principle of warpage control device BQK device of the present invention:

Of the goal of the invention part; This device purpose is that aligning is combined with the technical advantage that changes rolling cornerite; Realize simultaneously to the adjustment of rolling cornerite and to being with the aligning of steel warpage defective through a covering device; On the one hand from changing upper and lower surfaces rolling (smooth) state---one of main root (also being the main means of control warpage) that warpage produces is started with, and realizes the control to warpage; Through aligning, further improve the warpage situation of band steel on the other hand to rolling back band steel.

(a) the rolling cornerite of adjustment is to the improvement of warpage

In plate strip rolling process; Because all there is difference to a certain degree in the lubricating status planisher up-down rollers kind of drive, upper working rolls and lower working rolls diameter, band steel upper and lower surfaces; Cause being with steel upper and lower surfaces as-rolled condition different; The band steel exists extension to a certain degree inhomogeneous along thickness direction after rolling thereby cause, and will produce the warpage defective when extending difference when acquiring a certain degree.For the influence that extension distributes to thickness direction of band steel upper and lower surfaces as-rolled condition is described, carried out the finite element simulation simulation.

Fig. 4 is that the planisher cornerite of finite element simulation simulation changes the influence that band steel upper and lower surfaces is extended.The variation that therefrom can find out rolling cornerite is linear approximate relationship with band steel upper and lower surfaces extension difference.For the lower roll transmission planisher of being simulated in the emulation, under normal circumstances, band steel lower surface elongation is big; Be easy to generate that upwards C sticks up or L sticks up, therefore, when changing rolling cornerite through this device roller A; It is poor to change the extension of band steel upper and lower surfaces effectively, thereby plays the effect of control warpage.

Can be similar to according to the result of calculation of Fig. 4 and to think that rolling cornerite is linear to the influence that upper and lower surfaces extends rate variance (overstrain).And can obtain following formula

Δε ₁＝k ₁×a×d-c ₁

$a=\frac{180}{\mathrm{\&pi;L}}---\left(1\right)$

In the formula, Δ ε---upper and lower surfaces extends rate variance change amount;

k ₁---rolling cornerite changes the influence coefficient to warpage, and interval is [0,1];

A---rolling cornerite adjustment coefficient, 1/m;

The penetraction depth of the device A roller of d---BQK device, m;

L---the BQK device is to the distance of planisher, m;

c ₁---constant term, interval are [0,1];

Therefore, the present invention can realize the adjustment to rolling cornerite through the penetraction depth d of adjustment roller A, thereby the extensional of band steel upper and lower surfaces is poor in the controlled rolling district.When roller A presses, increase the cornerite of band steel to top working roll, thereby increase band steel upper surface distortion, reduce distortion with the steel lower surface, therefore can improve the inner residual stress of band steel, play the purpose of improving warpage.

(b) the aligning process is to the improvement of warpage

The present invention utilizes two rollers of outlet side to form similar straightening device, makes the band steel under the effect of smooth tension force (outlet tension force), realize the stretch bending distortion.When adjustment roller A height, the band steel owing to the bending stress and the tensile stress effect that are superposeed, produces plastic elongation in this stretch bending deformation process.Because therefore the residual stress that the band steel before the access to plant exists will be able to reduce through BQK device residual stress even eliminate fully, thereby play the effect that improves or eliminate warpage.

When adopting the planisher of single roller transmission, will produce corresponding warpage (C sticks up, L sticks up, turn round stick up etc.) to driven roll one side, therefore can on roller A, grinding go out a roll forming, further improve warpage control effect.

Shown in Figure 5 is after initial warpage defective forms, the variation of the upper and lower surfaces stress of band steel.Because added temperature field is about belt steel thickness direction symmetry.The upper surface of band steel is owing to shorten compression chord; The lower surface of band steel receives tension owing to spread.

Fig. 5 is a residual stress distribution situation of using the upper and lower surfaces of front and back band steel through the BQK device.Behind aligning, the upper and lower surfaces stress of band steel is comparatively close, thereby shows that band steel warpage defective is eliminated significantly.

In order to confirm that quantitatively roller A penetraction depth changes the improvement effect to band steel warpage.A large amount of operating modes of having used FEM model simulation calculation in the preceding text.On this basis, the method for utilization regression analysis is created as mathematical formulae easy to use.

Fig. 6 is the relation of certain ideal format band steel between BQK device aligning process central roll A penetraction depth and upper and lower surfaces residual stress difference; Therefrom can find out; Both there has been best penetraction depth value in band steel upper and lower surfaces residual stress poor (band steel warpage) along with the increase of penetraction depth reduces earlier afterwards to increase.

Adopt the method for regression analysis just can obtain the mathematic(al) representation that concerns between roller A penetraction depth and upper and lower surfaces residual stress,

Δσ＝k ₂Dd ²-k ₃Dd+c ₂ (3)

In the formula, Δ σ---the upper and lower surfaces residual stress is poor;

D---the diameter of BQK device A roller, m;

D---the penetraction depth of BQK device A roller, m;

k ₂, k ₃, c ₂---regression coefficient, span are respectively [0,10], [50,50], [0,500].

Then the mathematical notation formula of upper and lower surfaces overstrain difference Δ ε is following,

${\mathrm{\&Delta;\&epsiv;}}_2\&ap;\frac{\mathrm{\&Delta;\&sigma;}}{E}=\frac{{\mathrm{<figure-callout\; id="2"\; label="k"\; filenames="HDA0000057728870000012.png,HDA0000057728870000042.png"\; state="\{\{state\}\}">k</figure-callout>}}_2{\mathrm{Dd}}^2-{\mathrm{<figure-callout\; id="3"\; label="k"\; filenames="HDA0000057728870000012.png,HDA0000057728870000021.png"\; state="\{\{state\}\}">k</figure-callout>}}_3\mathrm{Dd}+c_2}{E}---\left(4\right)$

In the formula, E---band steel bomb property modulus.

(c) the comprehensive improvement of warpage

Comprehensively improve effect for the warpage of confirming rolling cornerite of adjustment and aligning, at first set up the relation of the penetraction depth of overstrain difference variation delta ε and BQK device A roller,

$\mathrm{\&Delta;\&epsiv;}={\mathrm{<figure-callout\; id="1"\; label="k"\; filenames="HDA0000057728870000011.png,HDA0000057728870000023.png"\; state="\{\{state\}\}">k</figure-callout>}}_1\&times;a\&times;d+\frac{{\mathrm{<figure-callout\; id="2"\; label="k"\; filenames="HDA0000057728870000012.png,HDA0000057728870000042.png"\; state="\{\{state\}\}">k</figure-callout>}}_2{\mathrm{Dd}}^2-{\mathrm{<figure-callout\; id="3"\; label="k"\; filenames="HDA0000057728870000012.png,HDA0000057728870000021.png"\; state="\{\{state\}\}">k</figure-callout>}}_3\mathrm{Dd}+c_2}{E}-c_1---\left(5\right)$

In addition, can also set up overstrain difference variation delta ε and the relational expression of being with steel C to stick up height change H according to geometrical relationship,

$\mathrm{\&Delta;H}=k_4\&CenterDot;{\sin }^2\left(\frac{\mathrm{b\&Delta;\&epsiv;}}{2h}\right)\frac{h}{\mathrm{\&Delta;\&epsiv;}}---\left(6\right)$

In the formula, h---belt steel thickness, m;

k ₄---influence coefficient, span [20,20].

Simultaneous formula (5), (6) just can confirm that the penetraction depth d of BQK device A roller and band steel C stick up the relational expression of highly improving Δ H,

$\mathrm{\&Delta;H}=k_4\&CenterDot;{\sin }^2\left(\frac{b(K_1{\mathrm{<figure-callout\; id="2"\; label="d"\; filenames="HDA0000057728870000012.png,HDA0000057728870000042.png"\; state="\{\{state\}\}">d</figure-callout>}}^2+K_{2}d+C)}{2h}\right)\&times;\left(\frac{h}{K_1{\mathrm{<figure-callout\; id="2"\; label="d"\; filenames="HDA0000057728870000012.png,HDA0000057728870000042.png"\; state="\{\{state\}\}">d</figure-callout>}}^2+K_{2}d+C}\right)---\left(7\right)$

In the formula, ${\mathrm{<figure-callout\; id="1"\; label="K"\; filenames="HDA0000057728870000011.png,HDA0000057728870000023.png"\; state="\{\{state\}\}">K</figure-callout>}}_1=\frac{k_{2}D}{E};$ ${\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="HDA0000057728870000012.png,HDA0000057728870000042.png"\; state="\{\{state\}\}">K</figure-callout>}}_2={\mathrm{<figure-callout\; id="1"\; label="k"\; filenames="HDA0000057728870000011.png,HDA0000057728870000023.png"\; state="\{\{state\}\}">k</figure-callout>}}_1\&times;a-\frac{k_{3}D}{E};$ $C=\frac{c_2}{E}-{\mathrm{<figure-callout\; id="1"\; label="c"\; filenames="HDA0000057728870000011.png,HDA0000057728870000023.png"\; state="\{\{state\}\}">c</figure-callout>}}_1.$

At last, in order to give full play to the effect of this device, the spy provides following control method (dependence diagram is as shown in Figure 7), but comprises following execution in step:

Step 1 is collected the device parameter of smooth unit, mainly confirms the distance between smooth unit and BQK device;

Step 2: confirm the device parameter of BQK device, mainly confirm the roller footpath of A roller;

Step 3: collect the characterisitic parameter of smooth band steel, comprising: smooth band steel Young's modulus, the band steel thickness and width;

Step 4: the depth of camber Δ H that measures smooth outlet band steel;

Step 5: go out the penetraction depth d of BQK device A roller according to formula iterative computation;

Step 6: according to the height of the penetraction depth d adjustment A roller that calculates.

Improvement method according to cold-strip steel warpage of the present invention; It is characterized in that when planisher adopted the independent transmission of lower roll, said warpage control device roller A was arranged in band steel downside; Roller B is arranged in band steel upside, and the pivot of roller B guarantees to be the radius of roller B apart from height of rolling line HB.

Thus, roller B influence of rolled line height not.

Improvement method according to cold-strip steel warpage of the present invention; It is characterized in that when planisher adopted the independent transmission of top roll, said warpage control device roller A was arranged in band steel upside; Roller B is arranged in band steel downside, and the pivot of roller B guarantees to be the radius of roller B apart from height of rolling line HB.

Thus, roller B influence of rolled line height not.

The present invention provides a kind of device that improves of cold-strip steel warpage, it is characterized in that, in the planisher exit warpage control device is set, and said warpage control device comprises: be up-down rollers with the roller A and the stationary roll roller B that can regulate height in vertical direction respectively.

The range of choice of the diameter D of roller A need satisfy following relational expression could guarantee that plastic deformation takes place the band steel through roller A the time,

$0.1D_t\&le;D\&le;0.5\frac{\mathrm{\&delta;E}}{{\mathrm{\&delta;}}_S}---\left(1\right)$

In the formula, δ---band steel minimum thickness;

σ _S---band steel yield limit,

D _t---the planisher work roll diameter.

The roll surface length L of roller A _ANeed satisfy following relational expression,

1.1B _max≤L _A≤1.6B _max (2)

In the formula, B _Max---band steel Breadth Maximum.

According to the improvement method of the bright cold-strip steel warpage of protection and improve device, the former product tin plate C of institute sticks up heavier, and the actual measurement warp value is generally in 35～60mm scope.Ideal format model amount of warpage is less than 20mm after implementing this scheme.

Description of drawings

Fig. 1 is a kind of anti-device that sticks up of continuous annealing unit.

Warpage control device when Fig. 2 is planisher lower roll transmission of the present invention.

Warpage control device when Fig. 3 is planisher top roll transmission of the present invention.

Fig. 4 is rolling cornerite and the graph of a relation of being with the distortion of steel upper and lower surfaces.

Fig. 5 shows residual stress on the thickness direction of use front and back.

Fig. 6 shows between BQK device roller A penetraction depth and upper and lower surfaces residual stress difference and concerns.

Fig. 7 is a control chart.

Fig. 8 is warpage effect comparison figure before and after implementing.

Fig. 9 is a control chart.

Figure 10 is a roller A penetraction depth sketch map.

Among the figure, 1 sticks up roller for anti-, and 2 be the warpage control device, and 3 be rolling cornerite, and 4 is planisher, and 5 is roller A initial position, and dd is a roller A penetraction depth, Fig. 2, and lower roll transmission in 10, among Fig. 3, the top roll transmission, 6 represent roller A, 7 represent roller B.

The specific embodiment

Below, with reference to accompanying drawing, specify the present invention.

Embodiment 1

This patent invention connects to move back at Baosteel 1220 have been carried out on the planisher implementing to use.It is the up-down rollers separate transmission that planisher moves back in 1220 companies, and therefore the layout to the BQK device does not have specific (special) requirements, therefore adopts mode shown in Figure 2 to arrange.Roller A diameter is 80mm.

Be that 1000mm, thickness are that the band steel of 0.5mm is an example with the width, the control method of roller A is described.Suppose to detect behind this specification belt steel flating to exist and highly stick up for the C of 100mm; Then can instead ask the penetraction depth of confirming roller A to be about 75mm according to formula (7); A regulates according to this penetraction depth pair roller, and the C that just can eliminate the band steel sticks up, and the control block diagram is as shown in Figure 9.

According to the present invention, it is as shown in the table, employing should technology after, 1220 connect move back the smooth back of smooth unit band steel warpage be improved significantly.

Table 2 ideal format model C sticks up quality inspection and judges

The present invention has less investment, instant effect, simple, the outstanding effect characteristics of Operation and Maintenance.Can be further connect to other move back smooth unit, hot tinning (zinc) line is applicable, and to improve each unit warpage control ability, solves its a product quality difficult problem of puzzlement, have important use and be worth and wide application prospect.

Claims (9)

1. the improvement method of a cold-strip steel warpage; It is characterized in that; In the planisher exit warpage control device is set, said warpage control device BQK comprises: be up-down rollers with the roller A and the stationary roll roller B that can regulate height in vertical direction respectively, comprise the steps:

Step 1 is collected the device parameter of smooth unit, collects the distance between smooth unit and BQK device, and smooth unit and BQK device space are 30mm-3000mm from scope,

Step 2: collect the device parameter of BQK device, comprising:

Collect the diameter of A roller, the diameter D scope of roller A is following;

$0.1D_t\&le;D\&le;0.5\frac{\mathrm{\&delta;E}}{{\mathrm{\&delta;}}_S}---\left(1\right)$

In the formula, δ---band steel minimum thickness;

σ _S---band steel yield limit,

D _t---the planisher work roll diameter,

E---Young's modulus,

The roll surface length L of roller A _ASatisfy following relational expression:

1.1B _max≤L _A≤1.6B _max (2)

In the formula, B _Max---band steel Breadth Maximum,

Step 3: collect the characterisitic parameter of smooth band steel, said characterisitic parameter comprises: the thickness and the width of the Young's modulus of smooth band steel, band steel; Wherein Young's modulus E is used for calculating parameter K ₁

Step 4: the depth of camber Δ H:0-200mm that records smooth outlet band steel;

Step 5: according to formula

$\mathrm{\&Delta;H}=k_4\&CenterDot;{\sin }^2\left(\frac{b(K_1{d}^2+K_{2}d+C)}{2h}\right)\&times;\left(\frac{h}{K_1{d}^2+K_{2}d+C}\right)$

In the formula;

rolling cornerite changes the influence coefficient to warpage, value 0-1;

$K_2=k_1\&times;a-\frac{k_{3}D}{E};$ $C=\frac{c_2}{E}-c_1,$

B---the width of band steel, m;

E---the Young's modulus of band steel, MPa;

D---the diameter of BQK device A roller, m;

D---the penetraction depth of BQK device A roller, m;

A---rolling cornerite adjustment coefficient, 1/m;

H---belt steel thickness, m;

k ₂, k ₃, c ₂---regression coefficient, span is respectively 0-10 ,-50-50,0-500;

L---the BQK device is to the distance of planisher, m;

c ₁---constant term, interval are 0-1;

k ₄---influence coefficient, span-20-20.

Iterative computation goes out the penetraction depth d of BQK device A roller;

Step 6: according to the penetraction depth d that step 5 calculates, the height of adjustment A roller.

2. a kind of cold-strip steel warpage as claimed in claim 1 improve device, it is characterized in that said smooth unit and BQK device space are 300-1000mm from scope.

3. a kind of cold-strip steel warpage as claimed in claim 1 improve device, it is characterized in that said planisher work roll diameter is 300-400mm.

4. a kind of cold-strip steel warpage as claimed in claim 1 improve device, it is characterized in that the diameter of said BQK device A roller is 40-100mm.

The described a kind of cold-strip steel warpage of claim 1 improve device, it is characterized in that said BQK device is 300-1000mm to the distance L of planisher.

6. a kind of cold-strip steel warpage as claimed in claim 1 improve device, it is characterized in that said k ₄Influence coefficient span-20-20.

7. the improvement method of cold-strip steel warpage as claimed in claim 1; It is characterized in that when planisher adopted the independent transmission of lower roll, said warpage control device roller A was arranged in band steel downside; Roller B is arranged in band steel upside, and the pivot of roller B guarantees to be the radius of roller B apart from height of rolling line HB.

8. the improvement method of cold-strip steel warpage as claimed in claim 1; It is characterized in that when planisher adopted the independent transmission of top roll, said warpage control device roller A was arranged in band steel upside; Roller B is arranged in band steel downside, and the pivot of roller B guarantees to be the radius of roller B apart from height of rolling line HB.

9. the control device of a cold-strip steel warpage; Said warpage control device is arranged on the planisher exit; It is characterized in that; Said warpage control device is a up-down rollers with the roller A and the stationary roll roller B that can regulate height in vertical direction respectively, and the range of choice of the diameter D of roller A need satisfy following relational expression could guarantee that plastic deformation takes place the band steel through roller A the time

$0.1D_t\&le;D\&le;0.5\frac{\mathrm{\&delta;E}}{{\mathrm{\&delta;}}_S}---\left(1\right)$

In the formula, δ---band steel minimum thickness;

σ _S---band steel yield limit,

D _t---the planisher work roll diameter,

The roll surface length L of roller A _ANeed satisfy following relational expression,

1.1B _max≤LA≤1.6B _max (2)

In the formula, B _Max---band steel Breadth Maximum.

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