CN103464469B - A kind of edge drop amount control method of cold rolling non-orientation silicon steel - Google Patents

Abstract

The invention provides a kind of edge drop amount control method of cold rolling non-orientation silicon steel, with the full six-high cluster mill of cold rolling five frame for object, minimum as object function using non-orientation silicon steel lateral thickness difference, by affecting the introducing of efficiency function matrix, set up the prediction of a whole set of working roll for non-orientation silicon steel edge drop control, feedback and work roll bending compensating control method.The present invention makes full use of original control appliance, is easy to safeguard, and saving technique canalization of funds drops into; Effectively can reduce the impact on Strip Shape Control precision simultaneously, improve non-orientation silicon steel cross caliper control precision, lateral thickness difference is made to be reduced to less than 8 μm from 25 μm, thus improve lamination rate and the end product quality qualification rate of non-orientation silicon steel finished product, preset and feed back propose a new solution route for adapting to the Edge Drop Control of commercial Application.

Description

A kind of edge drop amount control method of cold rolling non-orientation silicon steel

Technical field

The invention belongs to steel rolling automation field, particularly relate to a kind of edge drop amount control method for cold rolling non-orientation silicon steel.

Background technology

Energy-efficient, outstanding soft magnetism functional material that consumption is large that cold rolled silicon steel is first developed as country, be the most important thing of China's steel and iron industry breed structure readjustment, be widely used in the fields such as electric power, electromechanics, post and telecommunications and military project.Electromagnetic performance and lateral thickness difference are the important quality index of cold rolling non-orientation silicon steel.Lateral thickness difference determines the lamination coefficient of silicon steel, therefore user is in order to improve motor and transformer efficiency, not only has strict demand to the electromagnetic performance of silicon steel, and also high to the requirement of lateral thickness difference, commonly require that lateral thickness difference is less than or equal to 10 μm, senior requirement is less than or equal to 5 μm.In order to the situation that limit falls can be reflected, usually adopt two kinds of define methods at present:

(1) edge drop amount: the difference amount of steel edge portion specified point thickness and datum mark.Specified point position is generally selected in the place apart from edge 15mm by we in this case, and the position of datum mark is selected in the place apart from edge 100mm, so edge drop amount=t ₁₀₀-t ₁₅;

(2) edge drop rate: steel edge portion specified point thickness t ₁₅with rolling thickness t _cpercentage, i.e. t ₁₅/ t _c× 100%.

Cold rolled silicon steel lateral thickness difference size depends on that the steel edge portion in incoming hot rolled slab convexity and cold-rolled process is thinning.Current incoming hot rolled slab strip crown can meet the demands substantially, and thus cold rolled silicon steel transverse thick extent depends on the edge thinning of cold-rolled process completely.In cold-rolled process, steel edge portion thinning phenomenon is caused by the lateral flow of the elastic flattening of operation roll of mill and steel edge portion regional metal.Thinning in order to reduce steel edge portion, usually adopt sendzimir mill at present, K-WRS or EDC roll is rolled.These technical requirement operation roll of mill diameters are very little, or require that operation roll of mill has horizontal looseness function, and do not possess the HC milling train of play ability, in order to meet lateral thickness difference requirement, only carry out trimming process in subsequent handling.And solve cold rolling non-orientation silicon steel edge thinning problem not only from working roll roller footpath or the one-sided consideration of roll shape curve design, also should comprise: the compensation of working roll roll shifting (WRS) default control, work roll bending and limit fall the aspects such as FEEDBACK CONTROL and carry out Comprehensive Control.For the control technology of above-mentioned three edge thinnings, due to the problem of Controlling model and control strategy, the control accuracy in this field is general not high both at home and abroad.

Summary of the invention

The invention provides and be a kind ofly suitable for omnipotent convex rolling mill with intermediate calender rolls and work roll shifting function and UCMW(UniversalCrownmillwithMiddleandWorkshiftingroll) the edge drop amount control method of milling train cold rolling non-orientation silicon steel, be intended to solve problem low with steel transverse gage uniformity control accuracy in silicon steel production process, thus improve non-orientation silicon steel lamination rate, realize the object improving cold rolled silicon steel end product quality qualification rate.

For this reason, the solution that the present invention takes is:

An edge drop amount control method for cold rolling non-orientation silicon steel, utilizes UCMW milling train, is selected by reference point location apart from the edge drop amount control method at edge 115mm place and step be:

1, WRS coiling temperature setup: the presetting calculating convexity situation of incoming hot rolled slab being used for WRS.

Elastic flattening amount after roll is stressed , then the mathematic interpolation formula of tapered portion roll flattening amount and body of roll part roll flattening amount is:

,

In formula, pV _i for roll flattening amount difference; δ _eW+10for body of roll part flattening amount; δ _eW for tapered portion flattening amount; eWfor edge thinning flex point is apart from the distance value of steel edge portion.

By the profile gauge that cold continuous rolling entrance is arranged, to 32 convexity scannings of hot-strip cross section, obtain the convexity situation data of supplied materials, these convexity data carry out presetting calculating by the play position of primary computer to Taper roll and monolateral tapering roller jointly with the steel grade information and specification being with steel:

In formula, , be respectively ithe shifting amount of the upper and lower work roll crown correction of thickness position; , for iframe convexity correction factor, original state , ; , for upper and lower working roll play position manual correction amount; , for upper and lower working roll is for every side amount of falling of reference position; ifor the position, control point of correspondence; for unit rolling force setup value.

2, FEEDBACK CONTROL falls in limit: the finished product limit of outlet is fallen situation feedback and realize closed-loop control.

During the normal rolling of coil of strip, by the Bian Jiangyi being positioned at milling train outlet, steel roll rim thickness is measured, for effectively evaluating the effect of edge drop control, chosen distance edge nindividual, and n>=5, as the impact point evaluated, respectively fore side OS and transmission side DS is evaluated:

In formula, , for the thinning deviation of band steel OS, DS side portion; , for band steel OS, DS side portion Reducing thickness; for edge thinning desired value;

With as the method judged, wherein , judge the limiting value of edge thinning; judge edge nthe edge thinning amount of position.

By the overall merit to edge 5, situation falls in the current limit of basic grasp, controls to provide working roll play more accurately, and adopting affects efficiency function and carry out computing, ignore the impact of other factors, fixing tapering then play distance and Reducing thickness is linear approximate relationship.

Wherein, represent working roll play distance; Distance definition between adjacent play position is ; represent the thinning test point of steel edge portion; represent that play distance reaches the jindividual point causes iindividual test point the change of edge thinning amount;

If the jplay position, place changes unit u, can be obtained place's edge thinning amount :

If u=1,

Affecting efficiency function matrix is the weights determining that unit adjustment amount in WRS position affects each edge thinning.

The weights that each WRS adjustment amount affects each test point edge thinning, are calculated as follows:

In formula, be iindividual measurement point edge thinning value; be jindividual working roll play positional value;

for affecting efficiency function matrix irow, the jthe element of row;

Namely wherein the 1st subscript represents the shelf number of application

The edge thinning amount quadratic form error function defining each measurement point according to principle of optimality is a multi-variable function, is assumed to be , adopt more classical least square method to carry out computing:

In formula, nfor the thinning measurement point quantity of steel edge portion; mfor working roll play number of positions; be jindividual measurement point edge thinning measured value; for overlapping coefficient value; be iindividual edge drop feedback correction value;

Then WRS adjustment amount is:

In formula, , be respectively OS and DS edge drop amount feedback modifiers matrix; for overlapping coefficient matrix; mfor affecting efficiency function matrix; , be respectively OS and DS edge drop setting value and actual value deviation matrix.

3, WRS Bending compensation controls: the compensatory control giving work roll bending according to WR play change in location;

Because 1-3 frame working roll play position constantly changes along with the requirement of FEEDBACK CONTROL, the effect change that each frame must be caused to perform for Strip Shape Control roller, therefore requires that roller possesses the function carrying out auto-compensation, to ensure the effect of roller.Compensation method is as follows:

In formula, for iframe work roll bending compensation rate; for iframe working roll location variation; , for upper working rolls and lower working rolls play position actual value; for roller influence function; for working roll roll shifting feed forward factors.

By the closed-loop control of above-mentioned steps (1) ~ (3), realize the overall process of Edge Drop Control.

Beneficial effect of the present invention is:

The present invention with the full six-high cluster mill of cold rolling five frame for object, minimum as object function using non-orientation silicon steel lateral thickness difference, establish the prediction of a whole set of working roll for non-orientation silicon steel edge drop control, feedback and work roll bending compensating control method, compared with the prior art, there is following characteristics:

1, the Edge Drop Control proposing new adaptation commercial Application is preset and feedback;

2, introducing by affecting efficiency function matrix, improving cross caliper control precision;

3, by increasing the compensatory control of work roll bending, reduce Strip Shape Control Accuracy.

Therefore, it is thinning that the inventive method can reduce steel edge portion, and then improve the lamination rate of non-orientation silicon steel finished product, makes lateral thickness difference be reduced to less than 8 μm from 25 μm, achieves the object improving cold rolled silicon steel end product quality qualification rate.The present invention makes full use of original control appliance, is easy to safeguard, and can drop into by saving technique canalization of funds.

Accompanying drawing explanation

Fig. 1 is that definition position figure falls in strip edge;

Fig. 2 is edge drop amount control strategy figure;

Fig. 3 is monolateral tapering roller parameter and schematic diagram;

Fig. 4 is transmission side edge drop amount control effects figure;

Fig. 5 is fore side edge drop amount control effects figure.

Detailed description of the invention

As shown in Figure 1, existing specified point position is selected at distance edge 15mm place, and the position of datum mark is selected at distance edge 115mm place.For the electrical sheet of the UCMW mill milling 0.5mm thickness of certain cold-reduced silicon steel mill 1500mm, strip width 1250mm, known edge drop value eH=125 μm, while the distance of falling starting point distance steel edge portion is 40mm.Monolateral tapering roller taper design as shown in Figure 3, the difference of tapered portion roll flattening amount and body of roll part roll flattening amount pV=0-20 μm, can calculate the tapering of Taper roller according to formula:

According to strip width SW=1250mm, distance TSP=[1500-1250+2 (EW+10)]/2=175mm of tapering original position from roll edge can be determined.

For effectively evaluating the effect of edge drop control, chosen distance edge 5,10,15,25,30 5 points, as the impact point evaluated, are evaluated fore side OS and transmission side DS respectively.Arranging 1-3 frame is edge thinning process, possesses working roll roll shifting function.

1, default control realizes:

Cold continuous rolling entrance arranges profile gauge, if entrance profile gauge adopts simple scan formula, then cannot obtain the actual (real) thickness of strip section.Adopt cross section directly to measure formula, to 32 convexity scannings of hot-strip cross section, obtain the convexity situation data of supplied materials.These convexity data and steel grade information and the specification of being with steel, jointly carry out presetting calculating by the play position of TDC controller to Taper roll of SIEMENS:

Wherein pV=20 μm, , be set to 0.85 and 1.20 respectively, manually be set to 5mm, for inlet of rolling mill profile gauge actual detection limit depreciation; be set to 1MN.

2, edge drop FEEDBACK CONTROL realizes:

By the overall merit to edge five points, employing affects efficiency function and carries out the computing of working roll roll shifting correction value:

Wherein, for edge drop correction matrix ( represent the marginal dimension that fore side and transmission side must be revised); be icorrection falls in frame edge; for edge drop deviation matrix; for distance band steel edge xthe edge drop deviation of position.

Edge drop correction gain operation and bound are checked,

In formula, for edge drop feedback modifiers moment matrix ( : fore side/transmission side); be ithe edge drop feedback modifiers amount of individual frame; for feedback adjustment gain; for the gain of feedback mill speed.

3, WR Bending compensation control realization

The compensatory control of work roll bending is given according to WR play change in location,

Wherein, for iframe work roll bending compensation rate; for i frame working roll location variation; , for upper working rolls and lower working rolls play position actual value; for roller influence function, initial value is 0.05; for roll shifting feed forward factors, initial value is 1.0e-8.

Within the scope of steel edge portion 0-100mm, the edge drop control effect of transmission side and fore side is shown in Fig. 4, Fig. 5.Conclusion is as follows:

(1) on same milling train, the input of Edge Drop Control especially produces larger impact by edge thickness in the scope of 0-15mm.From above-mentioned data, while the amplitude of falling is greatly about 50%.

(2) as UCMW milling train, effectively can change the thickness distribution situation within the scope of edge 0-100mm, performance useful effect is fallen for elimination cold-rolled products limit.

(3) by producing actual research, find that the edge thickness distribution of convexity on cold rolling finished product of incoming hot rolled slab has larger impact.

(4) have the UCMW milling train of Edge Drop Control means, effectively can be improved the THICKNESS CONTROL effect of steel edge portion by the utilization of tapering roller, reduce the generation that limit falls, the trimming amount reducing later process improves lumber recovery.

Claims (1)

1. an edge drop amount control method for cold rolling non-orientation silicon steel, is characterized in that, utilizes UCMW milling train, is selected by reference point location apart from the edge drop amount control method at edge 115mm place and step be:

(1), WRS coiling temperature setup: the presetting calculating convexity situation of incoming hot rolled slab being used for WRS;

Elastic flattening amount δ=F (P) after roll is stressed, then the mathematic interpolation formula of tapered portion roll flattening amount and body of roll part roll flattening amount is:

PV _i＝δ _EW+10-δ _i＝F(P _EW+10)-F(P _i),0<i<EW+10

In formula, PV _ifor roll flattening amount difference; δ _eW+10for body of roll part flattening amount; δ _eWfor tapered portion flattening amount; EW is the distance value of edge thinning flex point apart from steel edge portion;

By the profile gauge that cold continuous rolling entrance is arranged, to 32 convexity scannings of hot-strip cross section, obtain the convexity situation data of supplied materials, these convexity data carry out presetting calculating by the play position of primary computer to Taper roll and monolateral tapering roller jointly with the steel grade information and specification being with steel:

$\mathrm{\&Delta;}{\mathrm{WRSt},i}^{\mathrm{cr}}=\frac{{\mathrm{\&alpha;}}_i\&times;\mathrm{\&Delta;}{\mathrm{Et}}_{i-j}}{{\tan \mathrm{\&theta;}}_i}+({\mathrm{\&beta;}}_i\&times;\mathrm{\&Delta;P})+i\&times;{\mathrm{PV}}_i+\mathrm{\&Delta;WRSt},i$

$\mathrm{\&Delta;}{\mathrm{WRSb},i}^{\mathrm{cr}}=\frac{{\mathrm{\&alpha;}}_i\&times;\mathrm{\&Delta;}{\mathrm{Eb}}_{i-j}}{{\tan \mathrm{\&theta;}}_i}+({\mathrm{\&beta;}}_i\&times;\mathrm{\&Delta;P})+i\&times;{\mathrm{PV}}_i+\mathrm{\&Delta;WRSb},i$

In formula, Δ WRSt, i ^cr, Δ WRSb, i ^crbe respectively the shifting amount of the upper and lower work roll crown correction of i thickness position; α _i, β _ifor i frame convexity correction factor, original state α _i=1, β _i=0; Δ WRSt, i, Δ WRSb, i are upper and lower working roll play position manual correction amount; Δ Et _i-j, Δ Eb _i-jfor upper and lower working roll is for every side amount of falling of reference position; I is corresponding position, control point; Δ P is unit rolling force setup value;

(2), FEEDBACK CONTROL falls in limit: the finished product limit of outlet is fallen situation feedback and realize closed-loop control;

During the normal rolling of coil of strip, steel roll rim thickness is measured, for effectively evaluating the effect of edge drop control by the Bian Jiangyi being positioned at milling train outlet, chosen distance edge n point, and n >=5, as the impact point evaluated, respectively fore side OS and transmission side DS is evaluated:

$\mathrm{\&Delta;}{E}_n^{\mathrm{os}}=E_n^{\mathrm{aim}}-E_n^{\mathrm{os}}$

$\mathrm{\&Delta;}{E}_n^{\mathrm{ds}}=E_n^{\mathrm{aim}}-E_n^{\mathrm{ds}}$

In formula, for the thinning deviation of band steel OS, DS side portion; for band steel OS, DS side portion Reducing thickness; for edge thinning desired value;

With as the method judged, wherein judge the limiting value of edge thinning; Δ E _njudge the edge thinning amount of edge n position;

By the overall merit to edge 5, obtain current limit and fall situation, and adopt and affect efficiency function and carry out computing, calculate corresponding working roll play position, under fixing tapering condition, play distance and Reducing thickness are linear approximate relationship;

Wherein, WRS ₁, WRS ₂... WRS _nrepresent working roll play distance; Distance definition between adjacent play position is WRS _a; E ₁, E ₂... E _nrepresent the thinning test point of steel edge portion; m _ijrepresent that play distance reaches a jth point and causes i-th test point E _ithe change of edge thinning amount;

If it is u that play position, jth place changes unit, E can be obtained _iplace edge thinning amount m _ij:

$\frac{{\mathrm{WRS}}_a}{u}=\frac{{\mathrm{WRS}}_a-|E_i-{\mathrm{WRS}}_j|}{m_{\mathrm{ij}}}$

If u=1,

$m_{\mathrm{ij}}=\frac{{\mathrm{WRS}}_a-|E_i-{\mathrm{WRS}}_j|}{{\mathrm{WRS}}_a}$

Affecting efficiency function matrix is the weights determining that unit adjustment amount in WRS position affects each edge thinning;

The weights that each WRS adjustment amount affects each test point edge thinning, are calculated as follows:

$M=\mathrm{Max}(0,m_{\mathrm{ij}})=\mathrm{Max}(0,\frac{{\mathrm{WRS}}_a-|E_i-{\mathrm{WRS}}_j|}{{\mathrm{WRS}}_a})$

In formula, E _ibe i-th measurement point edge thinning value; WRS _jfor a jth working roll play positional value; m _ijin order to affect, efficiency function matrix i-th arranges, the element of jth row;

Namely $M=\left(\begin{array}{ccc}{m}_{\mathrm{1,5}}& m_{\mathrm{2,5}}& m_{\mathrm{3,5}}\\ m_{\mathrm{1,10}}& m_{\mathrm{2,10}}& m_{\mathrm{3,10}}\\ m_{\mathrm{1,15}}& m_{\mathrm{2,15}}& m_{\mathrm{3,15}}\\ m_{\mathrm{1,25}}& m_{\mathrm{2,25}}& m_{\mathrm{3,25}}\\ m_{\mathrm{1,30}}& m_{\mathrm{2,30}}& m_{\mathrm{3,30}}\end{array}\right)$ Wherein the 1st subscript represents the shelf number of application

The edge thinning amount quadratic form error function defining each measurement point according to principle of optimality is a multi-variable function, is assumed to be Δ W _sδ _i, i ∈ 1 ... m, adopts least square method to carry out computing:

$J=\underset{j=1}{\overset{n}{\mathrm{\&Sigma;}}}{[\left({\mathrm{mes}}_j\right)-\underset{i=1}{\overset{m}{\mathrm{\&Sigma;}}}{w}_{\mathrm{ij}}\mathrm{\&Delta;}{W}_s{\mathrm{\&delta;}}_i{m}_{\mathrm{ij}}]}^2\&RightArrow;\min$

In formula, n is the thinning measurement point quantity of steel edge portion; M is working roll play number of positions; mes _jfor a jth measurement point edge thinning measured value; w _ijfor overlapping coefficient value; Δ W _sδ _ibe i-th edge drop feedback correction value;

Then WRS adjustment amount is: Δ W _sδ ^oS=((WM) ^twM) ^-1(WM) ^tw Δ E ^oS

ΔW _Sδ ^DS＝((WM) ^TWM) ^-1(WM) ^TWΔE ^DS

In formula, Δ W _sδ ^oS, Δ W _sδ ^dSbe respectively OS and DS edge drop amount feedback modifiers matrix; W is overlapping coefficient matrix; M is for affect efficiency function matrix; Δ E ^oS, Δ E ^dSbe respectively OS and DS edge drop setting value and actual value deviation matrix;

(3), WRS Bending compensation controls: the compensatory control giving work roll bending according to WR play change in location;

Compensation method is as follows:

$\mathrm{\&Delta;}{\mathrm{Wb}}_i^{\mathrm{ref}}={\mathrm{Mb}}_i\&CenterDot;\mathrm{\&Delta;}{\mathrm{WRS}}_i^{\mathrm{act}}/{\mathrm{Ms}}_i$

$\mathrm{\&Delta;}{\mathrm{WRS}}_i^{\mathrm{act}}={({\mathrm{WRS}}_i^{\mathrm{act}}+{\mathrm{WRS}}_i^{\mathrm{act}})}_n/2-{({\mathrm{WRS}}_i^{\mathrm{act}}+{\mathrm{WRS}}_i^{\mathrm{act}})}_{n-1}/2$

In formula, for i frame work roll bending compensation rate; for i frame working roll location variation; for upper working rolls and lower working rolls play position actual value; Mb _ifor roller influence function; Ms _ifor working roll roll shifting feed forward factors;

By the closed-loop control of above-mentioned steps (1) ~ (3), realize the overall process of Edge Drop Control.