CN102430585B - Method for correcting plate detection errors caused by horizontal temperature difference of cold-rolling strip steel - Google Patents

Abstract

A method for correcting plate detection errors caused by horizontal temperature difference of cold-rolling strip steel, comprising the steps of: receiving any five temperature value signals Ti (i=1-5) at different parts of the strip steel in the width direction measured actually online by an infrared thermometer and the coordinate signals Xi (i=1-5); receiving Ti (i=1-5) and Xi (i=1-5) and approaching the distribution curve of horizontal temperature of the strip steel by first order, second order, third order and fourth order Legendre orthogonal polynomials as primary functions to calculate the fitting coefficients a of each order of online temperature distribution curve of the strip steel; reading the coordinate value of plate characteristic point Y={y k}, (k=1, 2, Lambda, n) corresponding to the base target curve of the rolled strip steel; receiving a and Y, correcting a plate measuring signal and outputting a horizontal temperature different compensation C={ck}, (k=1, 2, Lambda, n); and finishing the correcting and compensating function.

Description

The modification method of plate detection errors caused by horizontal temperature difference of cold-rolling strip steel

Technical field

The present invention relates to the production of cold-strip steel, refer to particularly a kind of modification method of plate detection errors caused by horizontal temperature difference of cold-rolling strip steel.

Background technology

It is the important technology guarantee of producing high-quality cold-rolled steel strip products that plate shape closed loop feedback is controlled.At present, domestic and international advanced rolling mill production line exports the on-line measurement of Shape signal mostly at milling train exit configuration contact plate profile instrument, and the Shape signal that then will measure in real time sends plat control system to the completion system closed loop control function.Can find out, the precision of Shape signal just is directly connected to the quality that plate shape is controlled effect.

In the cold rolled strip steel production process, due to operation roll of mill from between steel, having frictional force and skewness, different with the horizontal different parts heat transfer conditions of steel, milling train cooling fluid sectional ejecting cooling system control accuracy is lower and have than the extensive existence of the reasons such as large time delay the temperature additional stress that causes outlet to produce with there is transverse temperature difference in steel.In actual production, if do not consider to be with the compensation of steel transverse temperature difference, after detecting the good cooling samming of band steel online, will there will be flatness defect clearly.

Initial band steel transverse temperature difference compensation method thinks that belt steel temperature is with the steel center line symmetrical relatively, can utilize second order or quadravalence multinomial to simulate the belt steel temperature Transverse functions.But according to the actual fact, the cold rolling mill outlet is normally irregular with the temperature cross direction profiles of steel, and therefore this band steel transverse temperature difference compensation method unreasonable, have larger defect.In order to solve this technical barrier, the researcher in cold-strip steel field started to adopt the function that is comprised of to the quadravalence multinomial single order to approach the distribution of band steel transverse temperature in recent years, the plate shape that causes of compensating band steel transverse temperature difference is detected error to a certain extent, but this method has two weakness: 1) when calculating each order fitting coefficient, need to measure than the temperature value of the horizontal different parts of multi-group steel, amount of calculation is larger, be unfavorable for compensation method in line computation and application; 2) the transverse temperature difference compensated curve of deriving with steel transverse temperature distribution function by its match does not usually meet the horizontal internal stress of band steel from phase balance condition.The final use of considering temperature difference compensation curve in plat control system is and the superimposed acquisition flatness object curve of plate shape elementary object curve, from the rolling mill practice flatness object curve, need to meet the horizontal internal stress of band steel from phase balance condition, if, because the temperature difference compensation curve does not meet and from phase balance condition, causes the horizontal internal stress of band steel of flatness object curve to be damaged from phase balance condition with the horizontal internal stress of steel, will control harmful to cold-rolled strip steel shape.

In sum, the desirable compensation method for plate detection errors caused by horizontal temperature difference of cold-rolling strip steel need to possess following three technical conditions simultaneously: 1) milling train outlet band steel transverse temperature is distributed and has approximation capability preferably; 2) on-line calculation is little, and is convenient and swift, meets the real-time specification requirement of plat control system to online calculation procedure; 3) the gained compensated curve should meet the horizontal internal stress of band steel from phase balance condition.Because traditional band steel transverse temperature difference compensation method can not meet above three technical conditions simultaneously, can not fast and effeciently eliminate the plate shape that causes with the steel transverse temperature difference and detect error, therefore existing cold-rolled strip steel shape measuring system usually can not be for plat control system provides the not high accuracy Shape signal of tape steel transverse temperature difference impact, and this also becomes a technical barrier that hinders the raising of cold-rolled strip steel shape quality.Therefore, work out the modification method that a kind of plate shape that can the effective compensation transverse temperature difference causes detects error and have very high value.

Summary of the invention

Technical problem to be solved by this invention just is to provide a kind of modification method of plate detection errors caused by horizontal temperature difference of cold-rolling strip steel, can realize using less amount of calculation simulate the milling train outlet with the distribution of steel transverse temperature and obtain to meet with the cold-strip steel transverse temperature difference compensated curve of the horizontal internal stress of steel from phase balance condition, the plate shape detection error that the cold-strip steel transverse temperature difference causes is carried out to effective compensation.

For solving the problems of the technologies described above, the modification method of a kind of plate detection errors caused by horizontal temperature difference of cold-rolling strip steel provided by the invention comprises:

The online temperature acquisition step of band steel: the temperature value signal T of any five different parts on the strip width direction that the reception infrared radiation thermometer is surveyed out online _i(i=1,2,3,4,5) and position coordinates signal X thereof _i(i=1,2,3,4,5);

The online temperature distribution history fitting coefficient of band steel calculation procedure: receive temperature value signal T _i(i=1,2,3,4,5) and position coordinates signal X thereof _i(i=1,2,3,4,5), approach band steel transverse temperature distribution curve take single order, second order, three rank and quadravalence Legendre orthogonal polynomial as basic function, and with the calculating of each order fitting coefficient of the online temperature distribution history of steel a:

$a=\left(\begin{array}{c}{a}_0\\ a_1\\ a_2\\ a_3\\ a_4\end{array}\right)={\left[\begin{array}{ccccc}1& P_1\left(X_1\right)& P_2\left(X_1\right)& P_3\left(X_1\right)& P_4\left(X_1\right)\\ 1& P_1\left(X_2\right)& P_2\left(X_2\right)& P_3\left(X_2\right)& P_4\left(X_2\right)\\ 1& P_1\left(X_3\right)& P_2\left(X_3\right)& P_3\left(X_3\right)& P_4\left(X_3\right)\\ 1& P_1\left(X_4\right)& P_2\left(X_4\right)& P_3\left(X_4\right)& P_4\left(X_4\right)\\ 1& P_1\left(X_5\right)& P_2\left(X_5\right)& P_3\left(X_5\right)& P_4\left(X_5\right)\end{array}\right]}^{-1}\×\left(\begin{array}{c}{T}_1\\ T_2\\ T_3\\ T_4\\ T_5\end{array}\right)$

With plate shape characteristic point coordinate figure read step corresponding to this aim curve of base steel: read and be stored in plate shape and control roll in Computer Database with plate shape characteristic point coordinate figure Y={y corresponding to this aim curve of base steel _k, (k=1,2, Λ, n), wherein n is plate shape characteristic point number;

With the steel transverse temperature difference, cause the correction step of plate shape measurement error: each order fitting coefficient of the online temperature distribution history of receiving belt steel a and with plate shape characteristic point coordinate figure Y corresponding to this aim curve of base steel, the mechanism model that causes the plate shape measurement error according to transverse temperature difference is revised the plate shape measurement signal, output transverse temperature difference compensation rate C={c _k, (k=1,2, Λ, n);

Correction result performing step: receive transverse temperature difference compensation rate C, transverse temperature difference compensation rate C, according to plate shape characteristic point coordinate figure Y corresponding to this aim curve of base steel, being embedded into one by one in the design of cold-strip steel elementary object plate shape curve, is completed to the correction-compensation function to plate detection errors caused by horizontal temperature difference of cold-rolling strip steel.

In the online temperature acquisition step of described band steel of technique scheme, on selected strip width direction, five different thermometrics positions laterally are uniformly distributed.

In the online temperature distribution history fitting coefficient of the described band steel calculation procedure of technique scheme, the basic function P about temperature survey point coordinates X that single order, second order, three rank and quadravalence Legendre orthogonal polynomial are determined _j(X) (j=1,2,3,4) are:

$P_1\left(X\right)=\frac{2X}{B}$

$P_2\left(X\right)=\frac{3}{2}{\left(\frac{2X}{B}\right)}^2-\frac{1}{2}$

$P_3\left(X\right)=\frac{5}{2}{\left(\frac{2X}{B}\right)}^3-\frac{3}{2}\left(\frac{2X}{B}\right)$

$P_4\left(X\right)=\frac{1}{8}(35{\left(\frac{2X}{B}\right)}^4-30{\left(\frac{2X}{B}\right)}^2+3)$

Wherein with the width of steel, X is for take the temperature survey point coordinates on as the origin of coordinates, close milling train transmission side direction as the reference axis of positive direction with steel transverse center point for roll for B.

Technique scheme described causes that with the steel transverse temperature difference in the correction step of plate shape measurement error, transverse temperature difference causes that the mechanism model of plate shape measurement error is:

$c=-{\mathrm{\α}}_t\×\frac{E}{1-v^2}\×(a_1{P}_1\left(y\right)+a_2{P}_2\left(y\right)+a_3{P}_3\left(y\right)+a_4{P}_4\left(y\right))$

Wherein, y is the coordinate figure of any one plate shape characteristic point, α _tFor the linear expansion coefficient of roll with steel, E is the elasticity modulus of materials of roll with steel, and v is the material Poisson's ratio of roll with steel.

The described correction result performing step of technique scheme according to the size order with plate shape characteristic point coordinate figure Y corresponding to this aim curve of base steel just transverse temperature difference compensation rate C be added to successively on plate shape basic standard curve, complete the correction-compensation function to plate detection errors caused by horizontal temperature difference of cold-rolling strip steel.

Compared with prior art, beneficial effect of the present invention is: utilize the single order meet the Orthogonal Decomposition condition to the quadravalence Legnedre polynomial for basic function with effectively the approaching of steel transverse temperature distribution function, resulting compensated curve meets the horizontal internal stress of band steel automatically from phase balance condition; Fitting coefficient only needs to measure the temperature value of five different parts of strip width direction in line computation, so amount of calculation is little, meets the real-time specification requirement of plat control system to online supercomputing program; The transverse temperature difference compensated curve is directly embedded in the middle of the flatness object curve setting, has conveniently completed the correction-compensation function that transverse temperature difference is caused to the plate shape measurement temperature difference.

The accompanying drawing explanation

Fig. 1 is the structured flowchart of realizing a kind of update the system of the present invention;

Fig. 2 is the process chart of one embodiment of the invention;

Fig. 3 is the band steel transverse temperature scatter chart of certain match constantly in Fig. 2 method;

Fig. 4 is the band steel transverse temperature difference compensated curve figure that Fig. 2 method obtains.

The specific embodiment

Below in conjunction with accompanying drawing, specific embodiments of the invention are described in further detail:

Fig. 1 discloses the update the system of the modification method of realizing plate detection errors caused by horizontal temperature difference of cold-rolling strip steel of the present invention, and it comprises:

Band steel online temperature collect module, be used to receiving the temperature value signal T of any five different parts on the strip width direction that infrared radiation thermometer surveys out online _i(i=1,2,3,4,5) and position coordinates signal X thereof _i(i=1,2,3,4,5);

The online temperature distribution history fitting coefficient of band steel computing module, be connected with above-mentioned signal output part with the online temperature collect module of steel, be used to receiving temperature value signal T _i(i=1,2,3,4,5) and position coordinates signal X thereof _i(i=1,2,3,4,5), approach band steel transverse temperature distribution curve take single order, second order, three rank and quadravalence Legendre orthogonal polynomial as basic function, and with the calculating of each order fitting coefficient of the online temperature distribution history of steel a:

$a=\left(\begin{array}{c}{a}_0\\ a_1\\ a_2\\ a_3\\ a_4\end{array}\right)={\left[\begin{array}{ccccc}1& P_1\left(X_1\right)& P_2\left(X_1\right)& P_3\left(X_1\right)& P_4\left(X_1\right)\\ 1& P_1\left(X_2\right)& P_2\left(X_2\right)& P_3\left(X_2\right)& P_4\left(X_2\right)\\ 1& P_1\left(X_3\right)& P_2\left(X_3\right)& P_3\left(X_3\right)& P_4\left(X_3\right)\\ 1& P_1\left(X_4\right)& P_2\left(X_4\right)& P_3\left(X_4\right)& P_4\left(X_4\right)\\ 1& P_1\left(X_5\right)& P_2\left(X_5\right)& P_3\left(X_5\right)& P_4\left(X_5\right)\end{array}\right]}^{-1}\×\left(\begin{array}{c}{T}_1\\ T_2\\ T_3\\ T_4\\ T_5\end{array}\right)$

Wherein, the definite basic function P about temperature survey point coordinates X of single order, second order, three rank and quadravalence Legendre orthogonal polynomial _j(X) (j=1,2,3,4) are:

$P_1\left(X\right)=\frac{2X}{B}$

$P_2\left(X\right)=\frac{3}{2}{\left(\frac{2X}{B}\right)}^2-\frac{1}{2}$

$P_3\left(X\right)=\frac{5}{2}{\left(\frac{2X}{B}\right)}^3-\frac{3}{2}\left(\frac{2X}{B}\right)$

$P_4\left(X\right)=\frac{1}{8}(35{\left(\frac{2X}{B}\right)}^4-30{\left(\frac{2X}{B}\right)}^2+3)$

In formula, with the width of steel, X is for take the temperature survey point coordinates on as the origin of coordinates, close milling train transmission side direction as the reference axis of positive direction with steel transverse center point for roll for B.

With plate shape characteristic point coordinate figure read module corresponding to this aim curve of base steel, be used to reading, be stored in plate shape and control roll in Computer Database with plate shape characteristic point coordinate figure Y={y corresponding to this aim curve of base steel _k, (k=1,2, Λ, n), wherein n is plate shape characteristic point number;

With the steel transverse temperature difference, cause the correcting module of plate shape measurement error, with above-mentioned, with the online temperature distribution history fitting coefficient of steel computing module, with the output with plate shape characteristic point coordinate figure read module corresponding to this aim curve of base steel, be connected, for each order fitting coefficient of the online temperature distribution history of receiving belt steel a with plate shape characteristic point coordinate figure Y corresponding to this aim curve of base steel, the mechanism model that causes the plate shape measurement error according to transverse temperature difference is revised the plate shape measurement signal, output transverse temperature difference compensation rate C={c _k, (k=1,2, Λ, n), wherein, transverse temperature difference causes that the mechanism model of plate shape measurement error is:

$c=-{\mathrm{\α}}_t\×\frac{E}{1-v^2}\×(a_1{P}_1\left(y\right)+a_2{P}_2\left(y\right)+a_3{P}_3\left(y\right)+a_4{P}_4\left(y\right))$

In formula, y is the coordinate figure of any one plate shape characteristic point, α _tFor the linear expansion coefficient of roll with steel, E is the elasticity modulus of materials of roll with steel, and v is the material Poisson's ratio of roll with steel;

Correction result is realized module, for receiving transverse temperature difference compensation rate C, transverse temperature difference compensation rate C, according to plate shape characteristic point coordinate figure Y corresponding to this aim curve of base steel, being embedded into one by one in the design of cold-strip steel elementary object plate shape curve, is completed to the correction-compensation function to plate detection errors caused by horizontal temperature difference of cold-rolling strip steel.

Based on modification method of the present invention, can be used for four rollers, six roller single chassis or multi-frame tandem mills.Below take a single chassis six-high cluster mill as example, but the product of six-high cluster mill rolling comprises common plate, high-strength steel, part stainless steel and silicon steel etc.The present embodiment rolling be middle high grade silicon steel, basic mechanical design feature index and the device parameter of this unit are:

Raw material coil of strip: high grade non-oriented silicon steel (35W270～400 and 50W270～400);

Raw thickness: 1.8～2.5mm;

Raw material width: 850～1280mm;

Outgoing gauge: 0.3mm～1.0mm;

Important technological parameters: mill speed: Max 900m/min, draught pressure: Max 18000KN, coiling tension: Max220KN, main motor current: 5500KW;

Elasticity modulus of materials with steel: 2.06 * 10 ⁵

Material Poisson's ratio with steel: 0.3;

Linear expansion coefficient with steel: when temperature is 20～300 ℃, 12.1 * 10 ^-6～13.5 * 10 ^-6Between, and raise and be increase trend with temperature;

Outlet belt steel surface temperature: 230 ℃ of Max, select the PT10AF1 model of the small portable infrared radiation thermometer Portix B series that German Kai Le company manufactures with the online temperature measuring instrument of steel, temperature-measuring range is-30～400 ℃.

As shown in Figure 2, the specific works process of utilizing the present embodiment method to carry out error correction is:

1) receive the temperature value signal T of five different parts on the strip width direction that infrared radiation thermometer surveys out online _i(i=1,2,3,4,5) and position coordinates signal X thereof _i(i=1,2,3,4,5).Five different parts point for measuring temperature positions choosing in the present embodiment are respectively: the band steel laterally near the marginal position of fore side, band steel laterally near fore side 1/4 width position, band steel transverse center point position, band steel laterally near the marginal position of transmission side 1/4 width position, the laterally close transmission side of band steel.Take band steel transverse center point as the origin of coordinates, near the transmission side direction, be positive direction, in conjunction with rolling strip width (this example strip width 1250mm), the coordinate of above-mentioned five different parts is respectively: X ₁=-625mm, X ₂=-312.5mm, X ₃=0mm, X ₄=312.5mm, X ₅=625mm, certain thermometric constantly by infrared radiation thermometer measure temperature value be: T ₁=126 ℃, T ₂=129 ℃, T ₃=135 ℃, T ₄=132 ℃, T ₅=128 ℃;

2) receive said temperature value signal T _i(i=1,2,3,4,5) and position coordinates signal X thereof _i(i=1,2,3,4,5), approach band steel transverse temperature distribution curve take single order, second order, three rank and quadravalence Legendre orthogonal polynomial as basic function, and with the calculating of each order fitting coefficient of the online temperature distribution history of steel a:

$a=\left(\begin{array}{c}{a}_0\\ a_1\\ a_2\\ a_3\\ a_4\end{array}\right)={\left[\begin{array}{ccccc}1& P_1\left(X_1\right)& P_2\left(X_1\right)& P_3\left(X_1\right)& P_4\left(X_1\right)\\ 1& P_1\left(X_2\right)& P_2\left(X_2\right)& P_3\left(X_2\right)& P_4\left(X_2\right)\\ 1& P_1\left(X_3\right)& P_2\left(X_3\right)& P_3\left(X_3\right)& P_4\left(X_3\right)\\ 1& P_1\left(X_4\right)& P_2\left(X_4\right)& P_3\left(X_4\right)& P_4\left(X_4\right)\\ 1& P_1\left(X_5\right)& P_2\left(X_5\right)& P_3\left(X_5\right)& P_4\left(X_5\right)\end{array}\right]}^{-1}\×\left(\begin{array}{c}{T}_1\\ T_2\\ T_3\\ T_4\\ T_5\end{array}\right)$

Wherein, P _j(X _i) (j=1,2,3,4; I=1,2,3,4,5) be respectively by single order, second order, three rank and quadravalence Legendre orthogonal polynomial determine about i temperature survey point coordinates X _iBasic function, its form is as follows:

$P_1\left(X_i\right)=\frac{2X_i}{B};$

$P_2\left(X_i\right)=\frac{3}{2}{\left(\frac{2X_i}{B}\right)}^2-\frac{1}{2};$

$P_3\left(X_i\right)=\frac{5}{2}{\left(\frac{2X_i}{B}\right)}^3-\frac{3}{2}\left(\frac{2X_i}{B}\right);,$

$P_4\left(X_i\right)=\frac{1}{8}(35{\left(\frac{2X_i}{B}\right)}^4-30{\left(\frac{2X_i}{B}\right)}^2+3)$

In formula, B represents rolling strip width.This process is output as the online temperature distribution history single order of band steel to quadravalence fitting coefficient a _j(j=1,2,3,4).Fig. 3 has illustrated the band steel transverse temperature scatter chart after the thermometric moment five temperature values and match, and as seen from the figure, this method can be carried out good approach to asymmetric Temperature Distribution;

3) read and be stored in the interior roll of plate shape control Computer Database with plate shape characteristic point coordinate figure Y={y corresponding to this aim curve of base steel _k, (k=1,2, Λ, n), wherein n is plate shape characteristic point number.This aim curve of band base steel is according to the determined band steel expectation of rolling mill practice requirement exit plate shape, existing plat control system is all to be determined several plate shape characteristic points according to rolling strip width and plate profile instrument measured zone width magnitude relationship, with the expectation exit plate shape at these plate shape characteristic point places, is worth to characterize this aim curve of band base steel.After setting, these plate shape characteristic point coordinate figures and be stored in plate shape and control in Computer Database;

4) each order fitting coefficient of the online temperature distribution history of receiving belt steel a _j(j=1,2,3,4) and with plate shape characteristic point coordinate figure Y corresponding to this aim curve of base steel, cause that according to transverse temperature difference the mechanism model of plate shape measurement error is revised the plate shape measurement signal, output transverse temperature difference compensation rate C={c _k, (k=1,2, Λ, n).Wherein the compensation rate computing formula at k plate shape characteristic point place is:

$c_k=-{\mathrm{\α}}_t\×\frac{E}{1-v^2}\×(a_1{P}_1\left(y_k\right)+a_2{P}_2\left(y_k\right)+a_3{P}_3\left(y_k\right)+a_4{P}_4\left(y_k\right)),$

In formula, y _kBe the coordinate figure of k plate shape characteristic point, α _tFor the linear expansion coefficient of roll with steel, E is the elasticity modulus of materials of roll with steel, and v is the material Poisson's ratio of roll with steel.Fig. 4 has provided the band steel transverse temperature difference compensated curve figure that calculates according to above-mentioned, can find out qualitatively, and band steel transverse temperature difference compensated curve meets the horizontal internal stress of band steel from phase balance condition.

5) receive transverse temperature difference compensation rate C, transverse temperature difference compensation rate C, according to plate shape characteristic point coordinate figure Y corresponding to this aim curve of base steel, being embedded into one by one in the design of cold-strip steel elementary object plate shape curve, being completed transverse temperature difference is caused to plate shape is detected the correction-compensation of error.

Above embodiment is only be used to illustrating calculating thought of the present invention and characteristics; its purpose is to make those skilled in the art can understand content of the present invention and implement according to this; protection scope of the present invention is not limited to above-described embodiment; for example: five positions measuring temperature value are not limited to being uniformly distributed in preferred embodiment, get arbitrarily five different coordinates and all can wait.So the disclosed principle of all foundations, equivalent variations or the modification that mentality of designing is done, all within protection scope of the present invention.

Claims (4)

1. the modification method of a plate detection errors caused by horizontal temperature difference of cold-rolling strip steel, is characterized in that, it comprises the steps:

The online temperature acquisition step of band steel: the temperature value signal T of any five different parts on the strip width direction that the reception infrared radiation thermometer is surveyed out online _i(i=1,2,3,4,5) and position coordinates signal X thereof _i(i=1,2,3,4,5);

The online temperature distribution history fitting coefficient of band steel calculation procedure: receive temperature value signal T _i(i=1,2,3,4,5) and position coordinates signal X thereof _i(i=1,2,3,4,5), approach band steel transverse temperature distribution curve take single order, second order, three rank and quadravalence Legendre orthogonal polynomial as basic function, and with the calculating of each order fitting coefficient of the online temperature distribution history of steel a:

The basic function P about temperature survey point coordinates X that described single order, second order, three rank and quadravalence Legendre orthogonal polynomial are determined _j(X) (j=1,2,3,4) are:

Wherein with the width of steel, X is for take the temperature survey point coordinates on as the origin of coordinates, close milling train transmission side direction as the reference axis of positive direction with steel transverse center point for roll for B,

With plate shape characteristic point coordinate figure read step corresponding to this aim curve of base steel: read and be stored in plate shape and control roll in Computer Database with plate shape characteristic point coordinate figure Y={y corresponding to this aim curve of base steel _k, (k=1,2 ..., n), wherein n is plate shape characteristic point number;

With the steel transverse temperature difference, cause the correction step of plate shape measurement error: each order fitting coefficient of the online temperature distribution history of receiving belt steel a and with plate shape characteristic point coordinate figure Y corresponding to this aim curve of base steel, the mechanism model that causes the plate shape measurement error according to transverse temperature difference is revised the plate shape measurement signal, output transverse temperature difference compensation rate C={c _k, (k=1,2 ..., n);

The correction result performing step, receive transverse temperature difference compensation rate C: transverse temperature difference compensation rate C, according to plate shape characteristic point coordinate figure Y corresponding to this aim curve of base steel, being embedded into one by one in the design of cold-strip steel elementary object plate shape curve, is completed to the correction-compensation function to plate detection errors caused by horizontal temperature difference of cold-rolling strip steel.

2. the modification method of plate detection errors caused by horizontal temperature difference of cold-rolling strip steel according to claim 1, it is characterized in that: in the online temperature acquisition step of described band steel, on selected strip width direction, five different thermometrics positions laterally are uniformly distributed.

3. the modification method of plate detection errors caused by horizontal temperature difference of cold-rolling strip steel according to claim 1 is characterized in that: in the described correction step that causes the plate shape measurement error with the steel transverse temperature difference, transverse temperature difference causes that the mechanism model of plate shape measurement error is:

Wherein, y is the coordinate figure of any one plate shape characteristic point, α _tFor the linear expansion coefficient of roll with steel, E is the elasticity modulus of materials of roll with steel, and ν is the material Poisson's ratio of roll with steel, a ₁, a ₂, a ₃And a ₄Be respectively single order, second order, three rank and quadravalence fitting coefficient with the online temperature distribution history of steel.

4. the modification method of plate detection errors caused by horizontal temperature difference of cold-rolling strip steel according to claim 1, it is characterized in that: described correction result performing step according to the size order with plate shape characteristic point coordinate figure Y corresponding to this aim curve of base steel just transverse temperature difference compensation rate C be added to successively on plate shape basic standard curve, complete the correction-compensation function to plate detection errors caused by horizontal temperature difference of cold-rolling strip steel.

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