CN1236872C - Plate thickness controller for continuous roll mill - Google Patents

Abstract

To provide a plate thickness control system for a continuous rolling mill which improves accuracy on plate thickness control by formulating and regulating the influence which the correction amount of screw down position gives to the tensile force between rolling mills, and by making it easy to set up an output threshold value. This system comprises a measurement means to measure a plate speed variation Delta Vout <n> at the exit of a rolling mill 12, a measurement means to measure a plate speed variation Delta Vin <n+1> at the entrance of a rolling mill 13, a measurement means to measure a correction amount of screw down position Delta V Sn at the rolling mill 12 and the correction amount or screw down position Delta V Sn+1 at the rolling mill 13, a measured quantity calculation means 17 to calculate a measured quantity Pout ,n <(-)> , Pin ,n+1 <(+)> which affects accuracy on the plate width of the workpiece based on the plate speed variation Delta Vout <n> , Delta Vin <n+1> and the correction amount of screw down position Delta V Sn , Delta V Sn+1 , and a control output adjustment means 18 to adjust a plate control output during rolling the workpiece, using a measured quantity.

Description

The board thickness control apparatus of continuous-rolling

Technical field

The present invention relates to carry out the board thickness control apparatus of the continuous-rolling of plate rolling, particularly consider because the mass unbalance of control output can be regulated the board thickness control apparatus of the continuous-rolling of control output for the influence of the transverse precision of rolled material.

Background technology

Figure 6 shows that the square frame pie graph of the described continuous-rolling board thickness control apparatus in the past of the special fair 6-71616 communique of Japan Patent for example, be depicted as one of most representative thickness meter mode thickness of slab control and the control of monitor mode thickness of slab example in the thickness of slab control mode.

In Fig. 6, the rolling phenomenon in the milling train 2 that utilizes screwdown gear 1 control, by computing key element 3 and 8 expressions, thickness meter mode board thickness control apparatus and monitor mode board thickness control apparatus constitute feedback control system respectively.

Screwdown gear 1 is specified the depressing position S that the depressing position of milling train 2 is controlled usefulness _ADepressing position S _AUtilize following formula to calculate.

S _A＝exp(-τ ₁S)/[(TpS+1)S]

Here, in following formula, the time constant of the speed when Tp is the response of the approximate screwdown gear 1 of expression, τ ₁Dead time when being the response of approximate screwdown gear 1.

Milling train 2 is according to the depressing position S that is instructed from screwdown gear 1 _AAnd milling train constant M, determine rolling load F _A

Rolled material is according to the rolling load F of milling train 2 _AAnd the key element 3 of plastic coefficient Q+ Δ θ, be rolled into thickness of slab h+ Δ h.At this moment, to have the entrance side thickness deviation Δ H of rolled material and Yin Wendu as the interference of rolling phenomenon and plasticity changes delta Q of causing etc.

Device constitutes like this, and it utilizes control of thickness meter mode thickness of slab and the control of monitor mode thickness of slab etc., eliminates the error delta h of the outlet side thickness of slab h+ Δ h of the rolled material that produces because of these changes delta H and Δ Q.

The following describes according to continuous-rolling board thickness control apparatus in the past shown in Figure 6 and specifically move situation.

At first, in thickness meter mode board thickness control apparatus, switch 6 carries out temporary transient ON Action in the moment that rolled material has just begun after rolling.

Like this, base pressure upper/lower positions memory storage 4 is with base pressure upper/lower positions S _A0Memorize, the rolling payload memory device 5 of benchmark is with the rolling load F of benchmark _A0Memorize.

Then, calculate depressing position S _AWith base pressure upper/lower positions S _A0Difference delta S _A, calculate rolling load F _AWith the rolling load F of benchmark _A0Difference delta F _A

In addition, thickness meter mode board thickness control apparatus is according to each difference delta S _AAnd Δ F _A, milling train constant M, regulation rate α and gain G, calculate depressing position correction amount S ^*, export to screwdown gear 1.

Like this, screwdown gear 1 uses depressing position correction amount S ^*, as previously mentioned, control depressing position S _A, to eliminate the thickness deviation Δ h of rolled material.

On the other hand, the monitor mode board thickness control apparatus is taken into the thickness of slab error delta h that is measured by the thickness of slab detector 9 that is arranged on milling train 2 rears, utilizes 10 couples of error delta h of integrator to carry out integration.

In addition, the calculation element 11 in the monitor mode board thickness control apparatus calculates eliminates the depressing position correction amount S*M that thickness of slab error delta h uses, and feeds back to screwdown gear 1.

At this moment, depressing position correction amount S*M utilizes following formula to calculate.

ΔS*M＝(Mc+Qc)f(v)/Qc

Such monitor mode board thickness control apparatus is many guarantees the thickness of slab control combination use of mode with thickness meter mode or absolute thickness.

For example, in the described monitor mode board thickness control apparatus of above-mentioned communique,, in known monitor mode board thickness control apparatus, try every possible means to be provided with the deferred mount of thickness of slab data to prevent that many milling train phases mutual interference etc. from being purpose.

But, in above-mentioned control, also do not consider owing to considering the mass unbalance control output adjusting method that horizontal influence is carried out for rolled material.

Figure 7 shows that by the rolled material side view of the state in the general continuous-rolling process.

In Fig. 7, three milling train n-1, n and N+1 are provided with continuously with respect to rolling in the direction of arrows rolled material.

Here be depicted as difference delta S owing to depressing position among each milling train n-1, n and the n+1 _N-1, Δ S _nAnd Δ S _N+1Difference and cause the state of the tension variation between each milling train.

At above-mentioned device in the past when controlling thickness of slab like that, monitor mode board thickness control apparatus not only is at depressing position correction amount S* and Δ S*M, when deviation being arranged because of each milling train, it is big that tension force between might for example a certain milling train becomes suddenly, as shown in Figure 7, and the danger that has the horizontal control accuracy of product to worsen.

In this case, tension force becomes big between milling train n-1 and n, and tension force diminishes between milling train n and n+1, between milling train n-1 and n, rolled material is added unusual big tension force, thereby produces the thickness of slab l fraction.

In order to prevent the deterioration of such transverse precision, the method that adopts in the past installing is for example to set control output stage limit value with constant, makes not produce above needed control output.

In addition, a kind of method is also proposed, promptly between each milling train, be provided be called loop liftex (looper) tenslator as servicing unit, or be provided with and monitor the depressing position correction variable of depressing position correction (or be equivalent to) and consider that influence to tension force is to change the control device that rolling mill speed is used.

But, also must utilize the tenslator of above-mentioned servicing unit, at first for the output stage limit value of board thickness control apparatus, must consider to set control output because of tension force between milling train increases baneful influence to transverse precision.

Continuous-rolling board thickness control apparatus in the past as mentioned above, because of increasing baneful influence to transverse precision, tension force between milling train sets control output on this basis, although require to consider owing to can not realize it, therefore the problem of result's existence is to obtain enough thickness of slab control accuracies.

Summary of the invention

The present invention proposes for addressing the above problem, and purpose is the influence formulism of depressing position correction to the tension force between milling train is set the output stage limit value by such can being convenient to, the continuous-rolling board thickness control apparatus of the thickness of slab control accuracy that is improved.

The board thickness control apparatus of continuous-rolling of the present invention is that the thickness of slab control output of many continuously arranged continuous-rollings of milling train is regulated, and the 1st plate speed variable quantity with the 1st plate speed variable quantity of measuring after rolled material has just been come out from the 1st milling train is measured means; Measure second plate speed variable quantity that described rolled material is about to enter the 2nd plate speed variable quantity before the 2nd milling train that is positioned at described the 1st milling train outlet side and measure means; Measure the 1st depressing position correction measurement means of the 1st depressing position correction of described the 1st milling train; Measure the 2nd depressing position correction measurement means of the 2nd depressing position correction of described the 2nd milling train; According to the described the 1st and the 2nd plate speed variable quantity and the described the 1st and second depressing position correction, the metric that calculates the metric that is used to detect the state that described rolled material transverse precision is exerted an influence calculates means; And utilize described metric, be rolled the control output regulating measure of in the process described thickness of slab control output being regulated in described rolled material.

In addition, the board thickness control apparatus of continuous-rolling of the present invention is that the thickness of slab control output of many continuously arranged continuous-rollings of milling train is regulated, and has the 1st outlet side thickness deviation measurement means of measurement at rolled material the 1st outlet side thickness deviation of the 1st milling train outlet side; Measurement is in the 2nd outlet side thickness deviation measurement means of described rolled material the 2nd outlet side thickness deviation of the 2nd milling train outlet side that is positioned at described the 1st milling train outlet side; Measure the 1st speed of rolls variable quantity of the 1st speed of rolls variable quantity of the millmotor of described the 1st milling train and measure means; The 2nd speed of rolls variable quantity of the 2nd speed of rolls variable quantity of measuring the millmotor of described the 2nd milling train is measured means, is measured the 1st depressing position correction measurement means of the 1st depressing position correction of described the 1st milling train; Measure the 2nd depressing position correction measurement means of the described the 2nd the 2nd depressing position correction that shuts out; The metric that calculates the metric that is used to detect the state that described rolled material transverse precision is exerted an influence according to the described the 1st and the 2nd outlet side thickness deviation and the described the 1st and the 2nd speed of rolls variable quantity and the described the 1st and the 2nd depressing position correction calculates means; And utilize the control that the described thickness of slab control output in the operation of rolling is regulated to described rolled material of described metric to export regulating measure.

In addition, the 2nd big metric of change when the metric calculating means of the board thickness control apparatus of continuous-rolling of the present invention become big the 1st variate-value and described the 2nd velocity variable continuously for positive state when calculating the 1st velocity variable continuously for negative state, control output regulating measure is regulated described thickness of slab control output the described the 1st and the additive value of the 2nd metric during greater than predefined constant to suppressing direction.

In addition, the board thickness control apparatus of a kind of continuous-rolling of the present invention, this device is regulated the thickness of slab control output of many continuously arranged continuous-rollings of milling train, has: measure the 1st outlet side thickness deviation measurement means at rolled material the 1st outlet side thickness deviation of the 1st milling train outlet side; Measurement is in the 2nd outlet side thickness deviation measurement means of described rolled material the 2nd outlet side thickness deviation of the 2nd milling train outlet side that is positioned at described the 1st milling train outlet side; Measure the 1st speed of rolls variable quantity of the 1st speed of rolls variable quantity of the millmotor of described the 1st milling train and measure means; The 2nd speed of rolls variable quantity of the 2nd speed of rolls variable quantity of measuring the millmotor of described the 2nd milling train is measured means, is measured the 1st depressing position correction measurement means of the 1st depressing position correction of described the 1st milling train; Measure the 2nd depressing position correction measurement means of the described the 2nd the 2nd depressing position correction that shuts out; For detecting the state that described rolled material transverse precision is exerted an influence, become the metric calculating means of big the 2nd metric when becoming big the 1st metric and described the 2nd speed of rolls variable quantity when calculating described the 1st speed of rolls variable quantity continuously for positive state continuously for negative state according to the described the 1st and the 2nd outlet side thickness deviation, the described the 1st and the 2nd speed of rolls variable quantity and the described the 1st and the 2nd depressing position correction; For obtain the frequency that is in the state that described rolled material transverse precision is exerted an influence according to the metric data collection of the relevant metric of a plurality of rolled materials, with reference to by the described the 1st and the data set that constitutes of the additive value of the 2nd metric, the frequency that calculates the frequency that exists greater than the addition value of predefined constant in described data centralization calculates means; And be in stated number when above at described frequency, regulate the gain-adjusted means of the gain of described thickness of slab control output to suppressing direction.

In addition, the frequency of the board thickness control apparatus of continuous-rolling of the present invention calculates means and tries to achieve described frequency according to the metric data collection of preceding once rolling rolled material, and the gain-adjusted means utilize described metric and described frequency to regulate the gain of described thickness of slab control output automatically.

In addition, the 2nd big metric of change when the metric calculating means of the board thickness control apparatus of continuous-rolling of the present invention become big the 1st metric and described the 2nd velocity variable continuously for positive state when calculating the 1st velocity variable continuously for negative state, frequency calculates means with reference to by the described the 1st and the data set that constitutes of the additive value of the 2nd metric, calculating is at the frequency of data centralization greater than the addition value existence of predefined constant, the gain-adjusted means are stated number when above at frequency, regulate the gain of thickness of slab control output to suppressing direction.

Description of drawings

Figure 1 shows that the tension model schematic illustration between the milling train that utilizes 1 control of the invention process form.

Figure 2 shows that the square frame pie graph of the invention process form 1.

Figure 3 shows that the square frame pie graph of the invention process form 2.

Figure 4 shows that the square frame pie graph of the invention process form 3.

Figure 5 shows that the square frame pie graph of the invention process form 4.

Figure 6 shows that the square frame pie graph of continuous-rolling board thickness control apparatus in the past.

Figure 7 shows that the overtension state schematic illustration between the milling train of utilization continuous-rolling board thickness control apparatus control in the past.

In the accompanying drawing, 1 is screwdown gear, and 9,20,21 is the thickness of slab detector, 12,13 is milling train, and 14 is load transducer, and 15,16 is plate speed detector, 17 is the metric calculation element, and 18 are control output regulating measure, and 19,23,26,27 is Operations Analysis, 22 is the velocity variations device for calculating, 24 is the data accumulating device, and 25 is the gain-adjusted means, and 25A is the automatic gain regulating measure, 33,34 is millmotor, P _{Out, n}(-), P _{In, n+1} ⁽⁺⁾Be metric, P _{Out, n}(-), P _{In, n+1} ⁽⁺⁾Be addition value, Δ h is thickness deviation (a thickness of slab error), Δ S _n ^*, Δ S _N+1 ^*Be depressing position correction, P _Out, ⁿBe outlet side plate speed variable quantity, P _In ^N+1Be inlet side plate speed variable quantity.

The specific embodiment

Example 1

Describe the invention process form 1 with reference to the accompanying drawings in detail.

The control principle of the invention process form 1 at first is described with reference to Fig. 1.

Figure 1 shows that the continuous-rolling side view that utilizes the invention process form 1 control, the tension force σ modeling with between the milling train 13 of the milling train 12 of shelf number n and shelf number n+1 schematically illustrates.The situation of regulating rolled material tension force σ between milling train 12 and 13 is described below typically.

In Fig. 1, pressing direction (reference arrow) is the direction of advance of rolled material, because the difference delta S that depresses load generation depressing position of each milling train 12 and 13 _n, and Δ S _N+1

In addition, sliding rate fn before the outlet side of milling train 12 shows, sliding rate b after the entrance side of milling train 13 shows _N+1

Tension force σ between each milling train 12 and 13 can think and the fast V of the outlet side plate of milling train 12 _Out ⁿInlet side plate speed V with milling train 13 _Out ^N+1The integrated value of difference be directly proportional, with following formula (1) expression.

[formula 1]

$\mathrm{\&sigma;}=\frac{E}{L}\&Integral;(V_{\mathrm{in}}^{n+1}-V_{\mathrm{out}}^n)\mathrm{dt}\&CenterDot;\&CenterDot;\&CenterDot;\left(1\right)$

Here, in formula (1), E is a Young's modulus, and L is the distance between each milling train.

In addition, in formula (1), upper right subscript n and n+1 are the shelf numbers of milling train 12 and 13.

Here, at depressing position correction amount S owing to milling train 12 _nBe continuously positive state thereby entrance side velocity variable Δ V _In ⁿWhen being continuously positive state, be metric P as becoming big metric function _{In, n+1} ⁽⁺⁾Represent with following formula (2).

[formula 2]

$P_{\mathrm{in},n}^{(+)}\&equiv;\underset{t=t_o-K\&CenterDot;\mathrm{\&Delta;t}}{\overset{t_o}{\mathrm{\&Sigma;}}}[\mathrm{\&Delta;}{S}_n\left(t\right)\&CenterDot;\mathrm{\&Delta;}{V}_{\mathrm{in}}^n\left(t\right)\&CenterDot;1\{\mathrm{\&Delta;}{S}_n\left(t\right)\left\}\right]\&CenterDot;\&CenterDot;\&CenterDot;\left(2\right)$

Here, in formula (2), function 1{X} defines with following formula (3).

[formula 3]

$1\left\{x\right\}\&equiv;\left\{\begin{array}{cc}1& x\&GreaterEqual;0\\ 0& x<0\end{array}\right.\&CenterDot;\&CenterDot;\&CenterDot;\left(3\right)$

In addition, in formula (2), to is a present moment, and Δ t is the sampling period, and K is suitable integer.

Equally, at depressing position correction amount S owing to milling train 12 _nBe continuously negative state thereby outlet side velocity variable Δ V _Out ⁿWhen being continuously negative state, be metric P as becoming big metric function _{Out, n} ^(-)Represent with following formula (4).

[formula 4]

$P_{\mathrm{out},n}^{(-)}\&equiv;\underset{t=t_o-K\&CenterDot;\mathrm{\&Delta;t}}{\overset{t_o}{\mathrm{\&Sigma;}}}[\mathrm{\&Delta;}{S}_n\left(t\right)\&CenterDot;\mathrm{\&Delta;}{V}_{\mathrm{out}}^n\left(t\right)\&CenterDot;1\{-\mathrm{\&Delta;}{S}_n\left(t\right)\left\}\right]\&CenterDot;\&CenterDot;\&CenterDot;\left(4\right)$

Here, the big condition of the tension force σ of rolled material change can be used following formula (5) expression between milling train 12 and milling train 13.

[formula 5]

$P_{\mathrm{out},n}^{(-)}+P_{\mathrm{in},n+1}^{(+)}>c_n\&CenterDot;\&CenterDot;\&CenterDot;\left(5\right)$

Here, in formula (5), Cn (＞0) is suitable positive constant.

Thereby, on the basis of setting Cn, when formula (5) is set up, satisfy following formula (6) as long as make.

[formula 6]

$\mathrm{\&Delta;}{S}_n^{*}=0\&CenterDot;\&CenterDot;\&CenterDot;\left(6\right)$

Even make and satisfy formula (6), then surpass the depressing position correction that needs, just can prevent from tension force is exerted an influence by output.

According to formula (7)～(22), obtain the outlet side plate speed variation delta V of milling train 12 respectively below _Out ⁿWith depressing position correction amount S _nRelational expression and the inlet side plate of milling train 12 speed variation delta V _In ^N+1With depressing position correction amount V _N+1Relational expression.

At first, the outlet side plate of milling train 12 speed V _Out ⁿCan utilize speed of rolls V _Rol ⁿAnd preceding sliding rate f _nRepresent with following formula (7).

[formula 7]

$V_{\mathrm{out}}^n=V_{\mathrm{rol}}^n(1+f_n)\&CenterDot;\&CenterDot;\&CenterDot;\left(7\right)$

In addition, the inlet side plate of milling train 13 speed V _In ^N+1Can utilize speed of rolls V _Rol ^N+1And back sliding rate b _N+1Represent with following formula (8).

[formula 8]

$V_{\mathrm{in}}^{n+1}=V_{\mathrm{rol}}^{n+1}(1-b_{n+1})\&CenterDot;\&CenterDot;\&CenterDot;\left(8\right)$

Here, if to the fast variation delta V of the outlet side plate of milling train 12 _Out ⁿPut then available following formula (9) expression in order.

[formula 9]

$\mathrm{\&Delta;}{V}_{\mathrm{out}}^n=(V_{\mathrm{rol}}^n+\mathrm{\&Delta;}{V}_{\mathrm{rol}}^n)(1+f_n+\mathrm{\&Delta;}{f}_n)-V_{\mathrm{rol}}^n(1+f_n)=(V_{\mathrm{rol}}^n+\mathrm{\&Delta;}{V}_{\mathrm{rol}}^n)\mathrm{\&Delta;}{f}_n+\mathrm{\&Delta;}{V}_{\mathrm{rol}}^n(1+f_n)\&CenterDot;\&CenterDot;\&CenterDot;\left(9\right)$

In addition, if to the fast variation delta V of the inlet side plate of milling train 13 _In ^N+1Put (10 expressions of then available following formula in order.

[formula 10]

$\mathrm{\&Delta;}{V}_{\mathrm{in}}^{n+1}=(V_{\mathrm{rol}}^{n+1}+\mathrm{\&Delta;}{V}_{\mathrm{rol}}^{n+1})(1-b_{n+1}-\mathrm{\&Delta;}{b}_{n+1})-V_{\mathrm{rol}}^{n+1}(1-b_{n+1})=-(V_{\mathrm{rol}}^{n+1}+\mathrm{\&Delta;}{V}_{\mathrm{rol}}^{n+1})\mathrm{\&Delta;}{b}_{n+1}+\mathrm{\&Delta;}{V}_{\mathrm{rol}}^{n+1}(1-b_{n+1})\&CenterDot;\&CenterDot;\&CenterDot;\left(10\right)$

Below with the depressing position correction amount S of milling train 12 _nTo preceding sliding rate deviation delta f _nInfluence and the depressing position correction amount S of milling train 13 _N+1To back sliding rate deviation delta b _N+1Influence formulism.

Promptly, derive following formula (11) at first according to the mass flow conservation principle.

[formula 11]

(1+f)h＝(1+b)H …(11)

In addition, derive following formula (12) according to formula (11).

[formula 12]

Δf·h+(1+f)·Δh＝Δb·H+(1+b)·ΔH

…(12)

Thereby following formula (13) is set up.

[formula 13]

$\mathrm{\&Delta;b}=(1+b)(-\frac{\mathrm{\&Delta;H}}{H}+\frac{\mathrm{\&Delta;h}}{h}+\frac{\mathrm{\&Delta;<figure-callout\; id="1"\; label="f"\; filenames="C0210307600211.png,C0210307600241.png"\; state="\{\{state\}\}">f</figure-callout>}}{1+f})$

$=\frac{h}{H}(1+f)(-\frac{\mathrm{\&Delta;H}}{H}+\frac{\mathrm{\&Delta;h}}{h}+\frac{\mathrm{\&Delta;<figure-callout\; id="1"\; label="f"\; filenames="C0210307600211.png,C0210307600241.png"\; state="\{\{state\}\}">f</figure-callout>}}{1+f})\&CenterDot;\&CenterDot;\&CenterDot;\left(13\right)$

Here, in formula (11)～(13), H is the entrance side thickness of slab of the 1st milling train 12, and h is the outlet side thickness of slab of the 1st milling train 12, and f is the preceding sliding rate of the 1st milling train 12, and b is the back sliding rate of the 1st milling train 12.

In addition, the approximate relational expression of preceding sliding rate can be used following formula (14) expression.

[formula 14]

$f=\frac{1}{C}\frac{H-h}{H}\&CenterDot;\&CenterDot;\&CenterDot;\left(14\right)$

Derive following formula (15) according to formula (14).

[formula 15]

$\mathrm{\&Delta;f}=\frac{1}{C}\frac{h}{H}[\frac{\mathrm{\&Delta;H}}{H}-\frac{\mathrm{\&Delta;h}}{h}]\&CenterDot;\&CenterDot;\&CenterDot;\left(15\right)$

Here, in formula (15), C is a constant.

In addition, according to the relational expression of rolling therory, following formula (16) is set up.

[formula 16]

$\mathrm{\&Delta;h}=\frac{A}{M}\mathrm{\&Delta;H}+(1-\frac{A}{M})\mathrm{\&Delta;S}\&CenterDot;\&CenterDot;\&CenterDot;\left(16\right)$

Here, in formula (16), A represents with following formula (17).

[formula 17]

$A=\frac{\mathrm{MQ}}{M+Q}$ $\&CenterDot;\&CenterDot;\&CenterDot;\left(17\right)$

Here, in formula (17), M is a milling train constant calculations formula, and Q is the plastic coefficient calculating formula.

With formula (17) formula (16) is changed, then derived following formula (18).

[formula 18]

$\mathrm{\&Delta;H}=\frac{M}{A}\{\mathrm{\&Delta;h}-(1-\frac{A}{M})\mathrm{\&Delta;S}\}\&CenterDot;\&CenterDot;\&CenterDot;\left(18\right)$

According to following formula (7)～(8), if use depressing position correction amount S _nAnd thickness deviation Δ h _nSliding rate deviation delta f before the expression _n, then can use following formula (19) expression.

[formula 19]

$\mathrm{\&Delta;}{f}_n=\frac{1}{C}\frac{h_n}{H_n}\left[\frac{M_n}{A_n}\frac{1}{H_n}\right\{\mathrm{\&Delta;}{h}_n-(1-\frac{A_n}{M_n})\mathrm{\&Delta;}{S}_n\}-\frac{\mathrm{\&Delta;}{h}_n}{h_n}]\&CenterDot;\&CenterDot;\&CenterDot;\left(19\right)$

Here, in formula (19), the subscript n of bottom right is the shelf number of milling train 12.

In addition, the back sliding rate deviation delta b of milling train 13 _N+1Identical with described formula (13), can use depressing position correction amount S _N+1And thickness deviation Δ h _N+1Be expressed as following formula (20).

[formula 20]

$\mathrm{\&Delta;}{b}_{n+1}=\frac{h_{n+1}}{H_{n+1}}(1+f_{n+1})[-\frac{M_{n+1}}{A_{n+1}}\frac{1}{H_{n+1}}\{\mathrm{\&Delta;}{h}_{n+1}-(1-\frac{A_{n+1}}{M_{n+1}})\mathrm{\&Delta;}{S}_{n+1}\}+\frac{\mathrm{\&Delta;}{h}_{n+1}}{h_{n+1}}+\frac{\mathrm{\&Delta;}{f}_{n+1}}{1+f_{n+1}}]\&CenterDot;\&CenterDot;\&CenterDot;\left(20\right)$

In addition, the preceding sliding rate deviation delta f of milling train 13 _N+1Identical with described (15), can use following formula (21) expression.

[formula 21]

$\mathrm{\&Delta;}{f}_{n+1}=\frac{1}{C}\frac{h_{n+1}}{H_{n+1}}\left[\frac{M_{n+1}}{A_{n+1}}\frac{1}{H_{n+1}}\right\{\mathrm{\&Delta;}{h}_{n+1}-(1-\frac{A_{n+1}}{M_{n+1}})\mathrm{\&Delta;}{S}_{n+1}\}-\frac{\mathrm{\&Delta;}{h}_{n+1}}{h_{n+1}}]\&CenterDot;\&CenterDot;\&CenterDot;\left(21\right)$

The preceding sliding rate f of milling train 13 is arranged again _N+1Identical with described formula (14), can use following formula (22) expression.

[formula 22]

$f_{n+1}=\frac{1}{C}\frac{H_{n+1}-h_{n+1}}{H_{n+1}}\&CenterDot;\&CenterDot;\&CenterDot;\left(22\right)$

According to following formula (7)～(22), the outlet side plate of milling train 12 speed variation delta V _Out ⁿCan be by Δ S _n, Δ h _nAnd Δ V _Rol ⁿTry to achieve the inlet side plate speed variation delta V of milling train 13 _In ^N+1Can be by Δ S _N+1, Δ h _N+1And Δ V _Rol ^N+1Try to achieve.

Figure 2 shows that the square frame pie graph of the invention process form 1.Depressing position correction amount S is adopted in expression _n ^*The Operations Analysis 19 (in the frame of broken lines) of regulating measure (will in aftermentioned).

In Fig. 2, each milling train 12 and 13 is provided with the screwdown gear 1 identical with described (with reference to Fig. 6), measures and depress the load transducer 14 of load, the board thickness control apparatus 31 and 32 with thickness meter mode board thickness control apparatus and two functions of monitor mode board thickness control apparatus.

Board thickness control apparatus 31 and 32 is according to from the thickness of slab error delta h of thickness of slab detector 9 and from the load of depressing of load transducer 14, to the screwdown gear 1 output depressing position correction amount S of milling train 12 and 13 _n ^*And Δ S _N+1 ^*

Speed detector 15 is measured the plate speed after rolled material has just been come out from milling train 12, and speed detector 16 is measured the plate speed before rolled material just will enter milling train 13.

Utilize the outlet side plate speed variation delta V of the milling train 12 of speed detector 15 detections _Out ⁿAnd utilize the inlet side plate speed variation delta V of the milling train 13 that speed detector 16 detects _In ^N+1Import the metric calculation element 17 in the Operations Analysis 19 respectively.

The screwdown gear 1 of milling train 12 comprises the depressing position correction amount S that measures milling train 12 _nDepressing position correction measurement means, the screwdown gear 1 of milling train 13 comprises the depressing position correction amount S that measures milling train 13 _N+1Depressing position correction measurement means.

Each depressing position correction amount S _nAnd Δ S _N+1 Metric calculation element 17 in the input Operations Analysis 19.

The Operations Analysis 19 that constitutes major part of the present invention has metric calculation element 17 and control output regulating measure 18.

Here only illustrate milling train 12 is regulated depressing position correction amount S _n ^*Operations Analysis 19, be provided with equally certainly milling train 13 regulated depressing position correction amount S _N+1 ^*The Operations Analysis of same structure.

Metric calculation element 17 is according to each plate speed variation delta V _Out ⁿAnd Δ V _In ^N+1With each depressing position correction amount S _nAnd Δ S _N+1, calculate the metric P that is used for detecting to the influential state of rolled material transverse precision _{Out, n} ^(-)+ P _{In, n+1} ⁽⁺⁾

In a single day control output regulating measure 18 is taken into from the depressing position correction amount S of 31 pairs of milling trains of board thickness control apparatus, 12 outputs _n ^*, then by adopting the metric P of addition _{Out, n} ^(-)+ P _{In, n+1} ⁽⁺⁾, just consider influence to transverse precision, in the rolled material operation of rolling, regulate depressing position correction amount S _n ^*

Each metric P of metric calculation element 17 calculating as described below _{Out, n} ^(-)And P _{In, n+1} ⁽⁺⁾

At first, utilize the depressing position correction amount S that obtains from the screwdown gear 1 of milling train 12 sides _nReach the plate speed deviation that obtains by speed detector 15 and promptly export side plate speed variation delta V _Out ⁿ, identical with described 4 (formulas), calculate P by following formula (23) _{Out, n} ^(-)

[formula 23]

$P_{\mathrm{out},n}^{(-)}\&equiv;\underset{t=t_o-K\&CenterDot;\mathrm{\&Delta;t}}{\overset{t_o}{\mathrm{\&Sigma;}}}[\mathrm{\&Delta;}{S}_n\left(t\right)\&CenterDot;\mathrm{\&Delta;}{V}_{\mathrm{out}}^n\left(t\right)\&CenterDot;1\{-\mathrm{\&Delta;}{S}_n\left(t\right)\left\}\right]\&CenterDot;\&CenterDot;\&CenterDot;\left(23\right)$

In addition, utilize the depressing position correction amount S that obtains from the screwdown gear 1 of milling train 13 sides _N+1And the plate speed deviation that obtains by the speed detector 16 side plate speed variable quantity that promptly enters the mouth, Δ V _In ^N+1, identical with formula (2), by following formula (24) computing metric P _{In, n+1} ⁽⁺⁾

[formula 24]

$P_{\mathrm{in},n+1}^{(+)}\&equiv;\underset{t=t_o-K\&CenterDot;\mathrm{\&Delta;t}}{\overset{t_o}{\mathrm{\&Sigma;}}}[\mathrm{\&Delta;}{S}_{n+1}\left(t\right)\&CenterDot;\mathrm{\&Delta;}{V}_{\mathrm{in}}^{n+1}\left(t\right)\&CenterDot;1\{\mathrm{\&Delta;}{S}_{n+1}\left(t\right)\left\}\right]\&CenterDot;\&CenterDot;\&CenterDot;\left(24\right)$

More predetermined constant C n and the metric P of control output regulating measure 18 _{Out, n} ^(-)+ P _{In, n+1} ⁽¹⁾, judge whether to satisfy following formula (25).

[formula 25]

$P_{n,\mathrm{out}}^{(-)}+P_{n+1,\mathrm{in}}^{(+)}>c_n\&CenterDot;\&CenterDot;\&CenterDot;\left(25\right)$

If satisfy formula (25), then set depressing position Δ S again _n ^*, make and satisfy following formula (26).

[formula 26]

$S_n^{*}=0\&CenterDot;\&CenterDot;\&CenterDot;\left(26\right)$

Like this, can in the operation of rolling of rolled material, detect the state that the depressing position correction exerts an influence to transverse precision, and regulate, do not make the control output that surpasses the board thickness control apparatus 31 more than needing screwdown gear 1 input.

Example 2

In above-mentioned example 1, in order to calculate oral-lateral plate speed V _Out ⁿAnd inlet side plate speed V _In ^N+1, adopted speed detector 15 and 16, but also can be according to other detection information calculations outlet side plate speed V _Out ⁿAnd inlet side plate speed V _In ^N+1

The invention process form 2 of speed detector 15 and 16 is omitted in explanation with reference to the accompanying drawings.

Figure 3 shows that the square frame pie graph of the invention process form 2, for the additional prosign of the part identical with described (with reference to Fig. 2), and omission is described in detail.

In Fig. 3, the outlet side in each milling train 12 and 13 is provided with the thickness of slab detector 20 and 21 of measuring the rolled material thickness of slab.Utilize thickness of slab detector 20 and the 21 thickness deviation Δ h that detect _nAnd Δ h _N+1Input to the velocity variations device for calculating 22 in the Operations Analysis 23.

Equally, each milling train 12 and 13 millmotor 33 and 34 speed of rolls V _Rol ⁿAnd V _Rol ^N+1With speed of rolls variation delta V _Rol ⁿAnd Δ V _Rol ^N+1Input to the velocity variations device for calculating 22 in the Operations Analysis 23.

Operations Analysis 23 also has the oral-lateral of calculating plate speed variation delta V except described metric calculation element 17 and control output regulating measure 18 _Out ⁿAnd inlet side plate speed variation delta V _In ^N+1With velocity variations device for calculating 22, make it in the operation of rolling, consider influence to transverse precision, regulate the depressing position correction amount S of board thickness control apparatus 31 outputs _n ^*

Velocity variations device for calculating 22 is operating speed detector 15 and 16 (with reference to Fig. 2) not, calculates the outlet side plate speed variation delta V of milling train 12 _Out ⁿAnd the inlet side plate of milling train 13 speed variation delta V _In ^N+1

Be that velocity variations device for calculating 22 adopts the thickness deviation Δ h that is obtained by each thickness of slab detector 20 and 21 (or replace its computational methods) _nAnd Δ h _N+1, the speed of rolls variation delta V that records by each millmotor 33 and 34 _Rol ⁿAnd Δ V _Rol ^N+1, and depressing position correction amount S _nAnd Δ S _N+1, calculate oral-lateral plate speed variation delta V _Out ⁿAnd inlet side plate speed variation delta _Vin ^N+1

In order to calculate oral-lateral plate speed variation delta V _Out ⁿ, adopt described formula (9) and formula (19), in order to calculate inlet side plate speed variation delta V _In ^N+1, adopt described formula (10), formula (20), formula (21) and formula (22).

Like this, speed detector 15 and 16 can be set,, calculate speed correction (variable quantity) with low cost according to the information that becomes more readily available.

In addition, according to the speed correction of calculating, can be with described identical, the depressing position correction is to the state of the influence of transverse precision in the detection operation of rolling, regulate, do not make the control output that surpasses the board thickness control apparatus 31 more than needing screwdown gear 1 input.

Example 3

In above-mentioned example 1, be computing metric P _{Out, n} ^(-)+ P _{In, n+1} ⁽⁺⁾As the relevant data of present rolled material, but also can preserve a plurality of rolled material data, calculate metric according to statistical disposition.

The invention process form 3 according to a plurality of rolled material data computation metrics is described with reference to the accompanying drawings.

Figure 4 shows that the square frame pie graph of the invention process form 3, for the additional prosign of the part identical with described (with reference to Fig. 3), and omission is described in detail.

In Fig. 4, Operations Analysis 26 is except described metric calculation element 17 and velocity variations device for calculating 22, the gain-adjusted means 25 of exporting regulating measure 18 are controlled in the data storage device 24 and the replacement that also have the metric data of a plurality of rolled materials of storage, make it in the operation of rolling, consider influence, regulate the depressing position correction amount S of board thickness control apparatus 31 outputs transverse precision _n ^*

Gain-adjusted means 25 comprise the frequency of trying to achieve the rated condition frequency and calculate means (not shown), adopt metric P _{Out, n} ^(-)+ P _{In, n+1} ⁽⁺⁾And frequency, the control output gain of adjusting board thickness control apparatus 31 in the rolled material operation of rolling.

Frequency in the gain-adjusted means 25 calculate the metric data collection { P of means according to a plurality of metrics relevant with rolled material _{Out, n} ^(-)+ P _{In, n+1} ⁽⁺⁾, try to achieve the frequency that is in the state that the rolled material transverse precision is exerted an influence.

It is metric P that data storage device 24 is preserved a plurality of rolled material data _{Out, n} ^(-)And P _{In, n+1} ⁽⁺⁾As data set { P _{Out, n} ^(-)+ P _{In, n+1} ⁽⁺⁾.

Data set { P in the gain-adjusted means 25 comparable data storage devices 24 _{Out, n} ^(-)+ P _{In, n+1} ⁽⁺⁾, whether judge wherein has the data that satisfy following formula (27).

[formula 27]

$P_{\mathrm{out},n}^{(-)}+P_{\mathrm{in},n+1}^{(+)}>c_n\&CenterDot;\&CenterDot;\&CenterDot;\left(27\right)$

More for a long time, set the output gain of board thickness control apparatus 31 less in the data that satisfy formula (27), by such adjusting control output (depressing position correction amount S _n ^*).

Like this, can detect depressing position correction amount S _n ^*To the state that transverse precision exerts an influence, regulate the gain of board thickness control apparatus 31, make not generate the control output that surpasses more than needing from board thickness control apparatus 31.

Example 4

In above-mentioned example 3, be in gain-adjusted means 24, only to judge to satisfy the more situation of data of formula (27), but also can constitute like this, make gain-adjusted means 24 that learning functionality is set, in the data that satisfy formula (27) more after a little while, automatically must be bigger with gain setting.

Illustrate that with reference to the accompanying drawings gain-adjusted means 24 are provided with the invention process form 4 of learning functionality.

Figure 5 shows that the square frame pie graph of the invention process form 4, for the additional prosign of the part identical with described (with reference to Fig. 4), and omission is described in detail.

In Fig. 5, Operations Analysis 27 has automatic gain regulating measure 25A and replaces described gain-adjusted means 25.

In this case, frequency in the automatic gain regulating measure 25A calculates means, try to achieve frequency according to preceding once rolling rolled material metric data collection, automatic gain regulating measure 25A availability value and frequency are regulated the control output gain of board thickness control apparatus 31 automatically.

Data set { the P of automatic gain regulating measure 25A once rolling rolled material metric before reading from data storage device 24 _{Out, n} ^(-)+ P _{In, n+1} ⁽⁺⁾, the data that satisfy above-mentioned formula (27) in this data centralization with described identical, are set the output gain of board thickness control apparatus 31 less more for a long time.

In addition at data set { P _{Out, n} ^(-)+ P _{In, n+1} ⁽⁺⁾In satisfy formula (27) data more after a little while, automatic gain regulating measure 25A sets the output gain of board thickness control apparatus 31 bigger.

Like this, can realize a kind of control output (depressing position correction amount S of automatic adjusting board thickness control apparatus 31 _n ^*) learning functionality.

Promptly can detect depressing position correction amount S according to previous rolled material data _n ^*To the state that transverse precision exerts an influence, regulate the gain of board thickness control apparatus 31 automatically, make board thickness control apparatus 31 not generate and surpass and need above control export.

As mentioned above, according to the present invention, it is the board thickness control apparatus that the thickness of slab control output of many continuously arranged continuous-rollings of milling train is regulated, the 1st plate speed variable quantity with the 1st plate speed variable quantity of measuring after rolled material has just been come out from the 1st milling train is measured means, measure the 2nd plate speed variable quantity that described rolled material is about to enter the 2nd plate speed variable quantity before the 2nd milling train that is positioned at described the 1st milling train outlet side and measure means, measure the 1st depressing position correction measurement means of the 1st depressing position correction of described the 1st milling train, measure the 2nd depressing position correction measurement means of the 2nd depressing position correction of described the 2nd milling train, according to the described the 1st and the 2nd plate speed variable quantity and the described the 1st and the 2nd depressing position correction, the metric that calculating is used to detect the metric of the state that described rolled material transverse precision is exerted an influence calculates means, and utilize described metric, be rolled the control output regulating measure of in the process described thickness of slab control output being regulated in described rolled material, since with the depressing position correction to tension force between the milling train influence formulism after regulate, therefore the effect that has is, set output stage limit value, the continuous-rolling board thickness control apparatus of the thickness of slab control accuracy that can be improved easily.

In addition, according to the present invention, it is the board thickness control apparatus that the thickness of slab control output of many continuously arranged continuous-rollings of milling train is regulated, have the 1st outlet side thickness deviation measurement means of measurement at rolled material the 1st outlet side thickness deviation of the 1st milling train outlet side, measurement is in the 2nd outlet side thickness deviation measurement means of described rolled material the 2nd outlet side thickness deviation of the 2nd milling train outlet side that is positioned at described the 1st milling train outlet side, measure the 1st speed of rolls variable quantity of the 1st speed of rolls variable quantity of the millmotor of described the 1st milling train and measure means, measure the 2nd speed of rolls variable quantity of the 2nd speed of rolls variable quantity of the millmotor of described the 2nd milling train and measure means, measure the 1st depressing position correction measurement means of the 1st depressing position correction of described the 1st milling train, measure the 2nd depressing position correction measurement means of the 2nd depressing position correction of described the 2nd milling train, according to the described the 1st and the 2nd outlet side thickness deviation, the the described the 1st and the 2nd speed of rolls variable quantity and the described the 1st and the 2nd depressing position correction, the metric that calculating is used to detect the metric of the state that described rolled material transverse precision is exerted an influence calculates means, and utilize the control that the described thickness of slab control output in the operation of rolling is regulated to described rolled material of described metric to export regulating measure, since with the depressing position correction to tension force between the milling train influence formulism after regulate, therefore the effect that has is, according to easy metrical information, set output stage limit value, the continuous-rolling board thickness control apparatus of the thickness of slab control accuracy that can be improved easily.

In addition, according to the present invention, because the 2nd big metric of change when metric calculating means become big the 1st metric and described the 2nd velocity variable continuously for positive state when calculating the 1st velocity variable continuously for negative state, control output regulating measure is the described the 1st and the additive value of the 2nd metric during greater than predefined constant, regulate described thickness of slab control output to suppressing direction, therefore the effect that has is, set output stage limit value, the continuous-rolling board thickness control apparatus of the thickness of slab control accuracy that can be improved easily.

In addition, according to the present invention, it is the board thickness control apparatus that the thickness of slab control output of many continuously arranged continuous-rollings of milling train is regulated, have the 1st outlet side thickness deviation measurement means of measurement at rolled material the 1st outlet side thickness deviation of the 1st milling train outlet side, measurement is in the 2nd outlet side thickness deviation measurement means of described rolled material the 2nd outlet side thickness deviation of the 2nd milling train outlet side that is positioned at described the 1st milling train outlet side, measure the 1st speed of rolls variable quantity of the 1st speed of rolls variable quantity of the millmotor of described the 1st milling train and measure means, measure the 2nd speed of rolls variable quantity of the 2nd speed of rolls variable quantity of the millmotor of described the 2nd milling train and measure means, measure the 1st depressing position correction measurement means of the 1st depressing position correction of described the 1st milling train, measure the 2nd depressing position correction measurement means of the 2nd depressing position correction of described the 2nd milling train, according to the described the 1st and the 2nd outlet side thickness deviation, the the described the 1st and the 2nd speed of rolls variable quantity and the described the 1st and the 2nd depressing position correction, the metric that calculating is used to detect the metric of the state that described rolled material transverse precision is exerted an influence calculates means, the frequency of obtaining the frequency that is in the state that described rolled material transverse precision is exerted an influence according to the metric data collection of a plurality of metrics relevant with rolled material calculates means, and the gain-adjusted means of utilizing described metric and described frequency that the gain of the described thickness of slab control output of described rolled material in the operation of rolling is regulated, since with the depressing position correction to the tension force between the milling train influence formulism after regulate, therefore the effect that has is, set output stage limit value, the continuous-rolling board thickness control apparatus of can be improved thickness of slab control accuracy and reliability easily.

In addition, according to the present invention, try to achieve described frequency because frequency calculates means according to the metric data collection of preceding once rolling rolled material, the gain-adjusted means utilize described metric and described frequency to regulate the gain of described thickness of slab control output automatically.With the depressing position correction to the tension force between the milling train influence formulism after regulate, therefore the effect that has is, set the output stage limit value easily, can be improved thickness of slab control accuracy and reliability, raising simultaneously be controlled continuous-rolling board thickness control apparatus automatically.

In addition, according to the present invention, because calculating, metric calculating means become the 1st big metric when described the 1st velocity variable is the state of bearing continuously, and described the 2nd velocity variable the 2nd big metric of change when continuously be positive state, frequency calculates means with reference to by the described the 1st and the data set that constitutes of the additive value of the 2nd metric, calculating is at the frequency of described data centralization greater than the addition value existence of predefined constant, the gain-adjusted means are in stated number when above at frequency, regulate the gain of described thickness of slab control output to suppressing direction, therefore the effect that has is, set easily the output stage limit value, the thickness of slab control accuracy that can be improved roll board thickness control apparatus continuously.

Claims (7)

1. the board thickness control apparatus of a continuous-rolling, this device is regulated the thickness of slab control output of many continuously arranged continuous-rollings of milling train, it is characterized in that having:

Measure the 1st plate speed variable quantity of the 1st plate speed variable quantity after rolled material has just been come out from the 1st milling train and measure means;

Measure the 2nd plate speed variable quantity that described rolled material is about to enter the 2nd plate speed variable quantity before the 2nd milling train that is positioned at described the 1st milling train outlet side and measure means;

Measure the 1st depressing position correction measurement means of the 1st depressing position correction of described the 1st milling train;

Measure the 2nd depressing position correction measurement means of the 2nd depressing position correction of described the 2nd milling train;

According to the described the 1st and the 2nd plate speed variable quantity and the described the 1st and the 2nd depressing position correction, the metric that calculates the metric that is used to detect the state that described rolled material transverse precision is exerted an influence calculates means;

And utilize described metric, be rolled the control output regulating measure of in the process described thickness of slab control output being regulated in described rolled material.

2. the board thickness control apparatus of continuous-rolling as claimed in claim 1 is characterized in that,

The 2nd big metric of change when described metric calculating means become big the 1st variate-value and described the 2nd plate speed variable quantity continuously for positive state when calculating described the 1st plate speed variable quantity continuously for negative state,

Described control output regulating measure is regulated described thickness of slab control output the described the 1st and the additive value of the 2nd metric during greater than predefined constant to suppressing direction.

3. the board thickness control apparatus of a continuous-rolling, this device is regulated the thickness of slab control output of many continuously arranged continuous-rollings of milling train, it is characterized in that having:

Measurement is in the 1st outlet side thickness deviation measurement means of rolled material the 1st outlet side thickness deviation of the 1st milling train outlet side;

Measurement is in the 2nd outlet side thickness deviation measurement means of described rolled material the 2nd outlet side thickness deviation of the 2nd milling train outlet side that is positioned at described the 1st milling train outlet side;

Measure the 1st speed of rolls variable quantity of the 1st speed of rolls variable quantity of the millmotor of described the 1st milling train and measure means;

The 2nd speed of rolls variable quantity of the 2nd speed of rolls variable quantity of measuring the millmotor of described the 2nd milling train measure means,

Measure the 1st depressing position correction measurement means of the 1st depressing position correction of described the 1st milling train;

Measure the 2nd depressing position correction measurement means of the 2nd depressing position correction of described the 2nd milling train;

According to the described the 1st and the 2nd outlet side thickness deviation, the described the 1st and the 2nd speed of rolls variable quantity and the described the 1st and the 2nd depressing position correction, the metric that calculates the metric be used to detect the state that described rolled material transverse precision is exerted an influence calculates means;

And utilize the control that the described thickness of slab control output in the operation of rolling is regulated to described rolled material of described metric to export regulating measure.

4. the board thickness control apparatus of continuous-rolling as claimed in claim 3 is characterized in that,

The 2nd big metric of change when described metric calculating means become big the 1st variate-value and described the 2nd speed of rolls variable quantity continuously for positive state when calculating described the 1st speed of rolls variable quantity continuously for negative state,

Described control output regulating measure is regulated described thickness of slab control output the described the 1st and the additive value of the 2nd metric during greater than predefined constant to suppressing direction.

5. the board thickness control apparatus of a continuous-rolling, this device is regulated the thickness of slab control output of many continuously arranged continuous-rollings of milling train, it is characterized in that having:

Measurement is in the 1st outlet side thickness deviation measurement means of rolled material the 1st outlet side thickness deviation of the 1st milling train outlet side;

Measurement is in the 2nd outlet side thickness deviation measurement means of described rolled material the 2nd outlet side thickness deviation of the 2nd milling train outlet side that is positioned at described the 1st milling train outlet side;

Measure the 1st speed of rolls variable quantity of the 1st speed of rolls variable quantity of the millmotor of described the 1st milling train and measure means;

The 2nd speed of rolls variable quantity of the 2nd speed of rolls variable quantity of measuring the millmotor of described the 2nd milling train measure means,

Measure the 1st depressing position correction measurement means of the 1st depressing position correction of described the 1st milling train;

Measure the 2nd depressing position correction measurement means of the described the 2nd the 2nd depressing position correction that shuts out;

For detecting the state that described rolled material transverse precision is exerted an influence, become the metric calculating means of big the 2nd metric when becoming big the 1st metric and described the 2nd speed of rolls variable quantity when calculating described the 1st speed of rolls variable quantity continuously for positive state continuously for negative state according to the described the 1st and the 2nd outlet side thickness deviation, the described the 1st and the 2nd speed of rolls variable quantity and the described the 1st and the 2nd depressing position correction;

For obtain the frequency that is in the state that described rolled material transverse precision is exerted an influence according to the metric data collection of the relevant metric of a plurality of rolled materials, with reference to by the described the 1st and the data set that constitutes of the additive value of the 2nd metric, the frequency that calculates the frequency that exists greater than the addition value of predefined constant in described data centralization calculates means;

And be in stated number when above at described frequency, regulate the gain-adjusted means of the gain of described thickness of slab control output to suppressing direction.

6. the board thickness control apparatus of continuous-rolling as claimed in claim 5 is characterized in that

Described frequency calculates means and tries to achieve described frequency according to the metric data collection of preceding once rolling rolled material,

Described gain-adjusted means utilize described metric and described frequency to regulate the gain of described thickness of slab control output automatically.

7. the board thickness control apparatus of continuous-rolling as claimed in claim 6 is characterized in that,

The 2nd big metric of change when described metric calculating means become big the 1st metric and described the 2nd speed of rolls variable quantity continuously for positive state when calculating described the 1st speed of rolls variable quantity continuously for negative state,

Described frequency calculates means with reference to by the described the 1st and the data set that constitutes of the additive value of the 2nd metric, calculates the frequency that exists greater than the addition value of predefined constant in described data centralization,

Described gain-adjusted means are in stated number when above at frequency, regulate the gain of described thickness of slab control output to suppressing direction.

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