JP2010064103A - Control device of plate width of hot-rolling machine, and control method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve the width control of a finished plate with high accuracy by a simple computation in the hot rolling. <P>SOLUTION: A control device of the plate width of a hot-rolling machine includes: a plate width estimating means 102 for estimating the plate width of a workpiece 157 rolled by a finish rolling machine 155 by using a plate thickness estimation model 115 based on the plate thickness estimation model 115 for storing the width of a slab 156 and the relationship between the rolling process and the plate thickness of the workpiece 157, and the indicated value of the width of the slab 156 and rolling information on the slab 156 taken from the hot rolling machine 150; a plate thickness deviation accumulating means 104 for accumulating the deviation between the result of estimation of the plate thickness estimating means 102 and the measured plate thickness of the workpiece 157 after the rolling for the immediately rolled workpiece 157; an adapting means 105 for correcting the target value of the plate thickness of the rolled workpiece 157 to be rolled next based on the contents of the plate thickness deviation accumulating means 104; and a preset control means 101 for calculating and outputting the control command to an edger 151 by the computation using the target value of the plate thickness corrected by the adapting means 105. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to hot rolling, and relates to a sheet width control apparatus and a control method thereof suitable for matching the sheet width of a hot rolled sheet with a target value.

Conventionally, as a conventional method for controlling the sheet width of a hot rolling mill, for example, in Patent Document 1, rolling case data is stored for each operation factor, and the finishing width is highly accurate from data of operation factors similar to the material to be rolled. A method for predicting and controlling according to the prediction information is shown.
Patent Document 2 discloses a method in which a sheet width prediction equation correction term is defined as a function of the component element content of the rolled material, and this correction is used for sheet width control.

Furthermore, in patent document 3, the relationship between the rough rolling track record after vertical rolling and the strip width track record after horizontal rolling is learned using information before rolling, and the strip width after rolling of the already rolled material using the learning result. A method for improving the accuracy of the setup of the vertical rolling mill for the subsequent rolled material by repeatedly predicting the above is shown.
Japanese Patent Laid-Open No. 2007-50413 JP 2002-224723 A JP-A-9-225513

However, these methods have the following problems.
In Patent Document 1, similarity determination using a factor that can be detected as an operation factor can be performed, but similarity relating to a factor that cannot be detected cannot be determined inevitably. Here, variation in the width of the slab before rolling the sheet width affects the finished width, but this is due to the fact that there is no means to directly measure the width of the slab before rolling in the normal hot rolling line. As a result, there is a problem that the prediction accuracy of the finished width after sheet width rolling is lowered.

  In addition, in the control method described in Patent Document 2, although the elasto-plastic characteristics of the steel material rolled by using the information on the component elements can be considered in detail, various factors affecting the finishing width, especially the plate width No consideration was given to the effect of the slab width before rolling. Therefore, there is a problem that the finishing width accuracy is lowered due to the variation in the slab width.

  On the other hand, in order to apply the control method described in Patent Document 3, it is necessary to measure the plate width before and after vertical rolling, the plate width after horizontal rolling, and the plate thickness. For this reason, it is necessary to install a detector for measuring each of them, and there is a problem that the system becomes expensive. Even if these detectors are installed, rough rolling usually performs descaling to remove the scale on the surface of the rolled material. There is a problem that this control method cannot be applied. Furthermore, there is a problem that the setup calculation is complicated because it is necessary to repeatedly set the plate width of the slab after vertical rolling to predict the plate width after horizontal rolling.

  In view of the above circumstances, the present invention aims to provide a sheet width control device for a hot rolling mill and a method for controlling the sheet width of a material to be rolled with high accuracy by simple calculation in sheet width control in hot rolling. To do.

  In order to achieve the above object, the sheet width control device for a hot rolling mill according to the first aspect of the present invention is a plate that uses an edger for a slab of a material to be rolled that has been cast by a continuous casting machine and entered the roughing mill. A sheet width control device for a hot rolling mill that controls a width to be a predetermined width and then controls a sheet width of a material to be rolled after being rolled by a finish rolling mill to a target value. Sheet width prediction model that stores the relationship between the width and rolling process and the sheet width of the rolled material after rolling, and the sheet width prediction from the indicated value of the slab width and the rolling information about the slab taken from the hot rolling mill The sheet width estimating means for estimating the sheet width of the material to be rolled after being rolled by the finish rolling mill using the model, and the estimation result of the sheet width estimating means and the material to be rolled after the rolling for the most recently rolled material. Sheet width deviation accumulating means for accumulating the deviation of the measured sheet width of the rolled material, and the sheet width deviation An adaptive means for correcting the target value of the sheet width of the rolled material to be rolled next time based on the contents of the product means, and calculation to the edger by calculation using the target value of the plate width corrected by the adaptive means. Preset control means for calculating and outputting a control command.

  The sheet width control device for a hot rolling mill according to the second aspect of the present invention is such that the sheet width is set to a predetermined width by an edger with respect to a slab of a material to be rolled which is cast by a continuous casting machine and enters the rough rolling mill. It is a sheet width control device for a hot rolling mill that controls and then controls the sheet width of the material to be rolled after being rolled by a finish rolling mill to a target value. Sheet width prediction model that stores the relationship of the sheet width of the material to be rolled, and the sheet width prediction model based on the actual sheet width value of the rolled material after rolling and the rolling information about the material rolled from the hot rolling mill The slab width estimation means for estimating the width of the slab before rolling of the material to be rolled by calculating back, and the slab width deviation accumulation means for accumulating the deviation between the estimation result of the slab width estimation means and the indicated value of the slab width; The slab width indication value is corrected based on the contents of the slab width deviation accumulating means. Learning means, and preset control means for calculating and outputting a control command to the edger for setting the sheet width of the rolled material after rolling by calculation using the slab width corrected by the learning means; It has.

  The sheet width control device of the hot rolling mill according to the third aspect of the present invention is such that the sheet width is a predetermined width by the edger with respect to the slab of the material to be rolled which is cast by the continuous casting machine and enters the rough rolling mill. It is a sheet width control device for a hot rolling mill that controls and then controls the sheet width of the material to be rolled after being rolled by a finish rolling mill to a target value. From the sheet width prediction model that stores the relationship between the sheet widths of the material to be rolled, the rolling slab information indicated by the slab width indication value, and the rolling information taken from the hot rolling mill, the finish rolling mill uses the sheet width prediction model. About the sheet width estimation means for estimating the sheet width of the rolled material after being rolled, and for the rolled material that was rolled most recently, the estimation result of the sheet width estimating means and the measured sheet width of the rolled material after rolling Based on the plate width deviation accumulating means for accumulating the deviation and the contents of the plate width deviation accumulating means next time From the adaptation means for correcting the target value of the strip width of the rolled material after rolling, and the rolling information on the rolled material taken from the hot rolling mill, the measured value of the strip width of the rolled material after rolling, The slab width estimating means for estimating the width of the slab before rolling of the material to be rolled by calculating back the sheet width prediction model, and the slab width for accumulating the deviation between the estimation result of the slab width estimating means and the indicated value of the slab width A deviation accumulating means, a learning means for correcting the slab width indication value based on the contents of the slab width deviation accumulating means, and an arithmetic operation using a selected one of the output of the learning means and the output of the adapting means And preset control means for calculating and outputting a control command to the edger for setting the sheet width of the rolled material after rolling to a target value.

  The sheet width control method of the sheet width control device for a hot rolling mill according to the fourth aspect of the present invention is such that the sheet width is cast by a continuous casting machine and the sheet width is reduced by an edger with respect to the slab of the material to be rolled that has entered the rough rolling mill. A sheet width control method for a sheet width control device of a hot rolling mill that controls the sheet width to be a predetermined value and then controls the sheet width of the material to be rolled after being rolled by a finish rolling mill to a predetermined value. Stores the relationship between the width of the slab and the rolling process and the sheet width of the rolled material after rolling. From the measured value of the rolled material after rolling and the rolling information about the rolled material taken from the hot rolling mill. Estimate the width of the slab before rolling by rolling back the relationship between the slab width and the rolling process and the sheet width of the rolled material after rolling, and the deviation between the estimated result and the indicated value of the slab width Is stored in the first table, and the slab width indication value and the slab taken from the hot rolling mill Rolling information was used to estimate the relationship between the slab width and the rolling process and the sheet width of the rolled material after rolling, and the sheet width of the rolled material after being rolled by a finish rolling mill. For the material, the deviation between the sheet width estimation result and the sheet width actual measurement value is calculated and accumulated in the second table, and the number of rolled sheets after the start of casting of the continuous casting machine or after the mold width change is taken in is calculated. When the value is below a certain value, the indication value of the width of the slab to be rolled next time is corrected according to the contents of the first table, and when the number of rolling is larger than the certain value, the next rolling is performed according to the contents of the second table. The sheet width target value of the material to be rolled is corrected, and a control command to the edger for controlling the sheet width of the rolled material after rolling to a predetermined value according to the correction result is calculated and output.

  According to the present invention, in the sheet width control in hot rolling, the sheet width of the material to be rolled can be controlled with high accuracy by simple calculation.

<< Overview of Sheet Width Control Device and Control Method for Hot Rolling Machine of the Present Invention >>
The sheet width control device and its control method for a hot rolling mill according to the present invention is a simple calculation that pays attention to variations in the slab width before rolling of a material to be rolled such as a steel sheet to be rolled back and forth in hot rolling. It is suitable for making the plate width of the rolled material after rolling coincide with the target value.
In particular, the present invention is particularly effective in a so-called mini mill in which a slab cast by a continuous casting machine is directly conveyed to a mill, which is suitable for a mini hot having a large correlation of variations in the sheet width of a rolled material after rolling.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
<< First Embodiment >>
FIG. 1 is a conceptual diagram showing a configuration of a control system S having a plate width control device 100 according to the first embodiment of the present invention.

<Configuration of Control System S Having Plate Width Control Device 100>
A control system S having a sheet width control device 100 according to the first embodiment receives a hot rolling mill 150 which is a hot rolling facility, and various signals from the hot rolling mill 150, and receives the control signal as a control target. A sheet width control device 100 that outputs to the edger 151 of the hot rolling mill 150 and controls the roll gap between the rolls 151r of the edger 151 is provided.

<Hot rolling mill 150>
First, the configuration of the hot rolling mill 150 that is the control target of the sheet width control apparatus 100 will be described.
The hot rolling mill 150 is a facility usually called a mini mill that performs a consistent casting and rolling process.

This hot rolling mill 150 includes a thin slab continuous caster 161 for cooling a molten material of a material to be rolled such as high-temperature iron supplied from a tundish 164, and a thin slab continuous caster 161 for forming a slab having a constant cross section. A torch cutter 162 for cutting the material to be rolled conveyed from the slab continuous casting machine 161 to a predetermined length, a tunnel furnace 163 for heating the material to be rolled cut by the torch cutter 162, and a material to be conveyed from the tunnel furnace 163. A slab 156 of rolled material is formed with a vertical roll of edger 151 and finished with a rough rolling mill 154 which is horizontally rolled by horizontal rolling mills R1 and R2 and a 5-stand tandem rolling mill F1 to F5. And a finish rolling mill 155 that performs rolling.
In the first embodiment, the material to be rolled is described as a steel plate 157.

<Thin slab caster 161>
The thin slab continuous casting machine 161 shown in FIG. 1 is used to cool the tundish 164 storing hot molten metal such as iron and the hot melt supplied from the tundish 164 into a slab 156. The mold 165 is a mold having dimensions corresponding to the thickness and width of the slab 156.

<Rough rolling mill 154>
The rough rolling mill 154 includes an edger 151 that forms a sheet width of the material to be rolled to a predetermined width, and a two-stand horizontal rolling machine R1 that rolls the material to be rolled conveyed from the edger 151 in the sheet thickness direction to form a predetermined thickness. , And R2.
The edger 151 represented by reference numeral E1 in FIG. 1 is provided on both sides of the slab 151 (the front and back directions on the paper surface in FIG. 1) conveyed with two vertical rolls 151r having a vertical rotation axis.
By adjusting the distance (roll gap) between the rolls 151r (the distance between a pair of rolls 151r provided in the front and back direction of the paper surface of FIG. 1), the slab 151 pressed by the two bowl-shaped rolls 151r is adjusted. The plate width is controlled.

<Finish rolling mill 155>
The finish rolling mill 155 is a 5-stand tandem rolling mill F1 to F5, and the rolling roll 159 of each of the tandem rolling mills F1 to F5 sequentially rolls the steel plate 157 of the material to be rolled conveyed from the rough rolling mill 154. Roll in direction to finish to desired thickness.

<Rolling process of hot rolling mill 150>
The rolling process in the hot rolling mill 150 is performed as follows.
As shown in FIG. 1, the hot melt of the material to be rolled stored in the tundish 164 is sent to the mold 165 by its own weight, and the hot melt is cooled and solidified from the outside in the mold 165, and is about 70 to 85 mm. A steel material having a thickness of 10 mm is produced. And this steel material is cut | disconnected by the torch cutter 162 about every 10m-30m in length, and becomes the slab 156 which is a to-be-rolled material before rolling.

The slab 156 is heated and heated by the tunnel furnace 163, and then rolled in the width direction by a pair of rolls 151r rotating around a vertical axis (up and down direction in FIG. 1) of the edger 151 in a roughing mill 154. After being rolled in the thickness direction by the horizontal rolling mills R1 and R2, the steel sheet 157 having a thickness of about 2 mm to 10 mm is formed in the finishing roll 155 by the rolling rolls 159 of the tandem rolling mills F1 to F5. .
Here, a plate width meter 158 is provided on the exit side of the finish rolling mill 155, and the plate width of the material to be rolled such as the steel plate 157 is measured.
Although omitted in FIG. 1, the steel plate 157 is then cooled by a runout table (not shown) and wound as a hot-rolled steel plate by a downcoiler (not shown).

<Plate width controller 100>
Next, the configuration of the sheet width control device 100 that controls the roll gap between the rolls 151r of the edger 151 of the hot rolling mill 150 will be described.
The board width control apparatus 100 shown in FIG. 1 is implemented using, for example, a programmable logic controller (PLC).
Prior to rolling by the hot rolling mill 150, the plate width control device 100 takes in the target plate width of the steel plate 157 to be rolled from a PDI (Primary Data Input) table 190 (see FIG. 2) and realizes this. A roll gap command value between the rolls 151r of the edger 151 is calculated, and a control command is output from the preset control means 101 to the edger 151.

In the edger 151, the distance between the rolls 151r is controlled to the roll gap according to the roll gap command value from the plate width control device 100, and processing is performed.
FIG. 2 is a diagram illustrating a configuration example of the PDI table 190.
As shown in FIG. 2, the PDI table 190 stores data of each item such as a steel type 190a and a slab width 190b corresponding to the steel plate number 190o.
FIG. 2 shows that steel plate number HX0012352 has a steel type 190a: SS400, a slab width 190b: 1220 mm, a target plate width 190c: 1200 mm, and the like.

The order 190i after the charge start or after the width change shown in FIG. 2 indicates how many steel plates 157 the HX0012352 is after the thin slab continuous casting machine 151 starts the charge (casting) or changes the cast width. Yes.
Note that “after width change” is after the width setting value of the thin slab continuous caster 161 or the like is changed in order to make the rolled steel plate 157 have a desired width.
The sheet width control apparatus 100 shown in FIG. 1 estimates the sheet width of the rolled steel sheet 157 from the rolling state such as the roll gap of the edger 151, the transition of the sheet thickness in the roughing mill 154, and the finishing mill 155. The prediction model 115 is provided, and the contents thereof are expressed by the following expressions (1) to (6).

  The sheet width control device 100 captures actual data such as the rolling results of the roughing mill 154 and the finishing mill 155 and the thickness of the slab 156 before being rolled by the roughing mill 154 from the hot rolling mill 150 to be controlled. The sheet width estimating means 102 for estimating the sheet width of the rolled steel sheet 157 using the sheet width prediction model 115, the output of the sheet width estimating means 102 and the corresponding steel sheet actually measured by the sheet width meter 157 after rolling A plate width deviation calculating unit 103 that calculates a deviation from the actual measured value of the plate width of 157 (see FIG. 1), and a plate width deviation value calculated by the plate width deviation calculating unit 103 for the most recently rolled steel plate 157 are stored. Using the sheet width deviation accumulating means 104 and the value of the sheet width deviation accumulated in the sheet width deviation accumulating means 104, the sheet width target value is corrected so that the rolled material (steel plate 157) after rolling has a desired sheet width. And an adaptive means 105 for calculating an adaptive control amount for this purpose.

  Further, the sheet width control device 100 shown in FIG. 1 includes a rolled material measured by a sheet width meter 158, a rolling material (rolling material after rolling) 154, a roughing mill 154, a finish rolling mill 155, and a rolled material ( Steel plate 157) is taken in, and the back calculation result obtained by calculating back the sheet width prediction model 115 by the slab width reverse calculation means 106 for back calculating the width of the slab 156 before rolling in the rough rolling mill 154, and The slab width deviation calculating means 107 for calculating the slab width deviation from the slab width 190b instructed from the PDI table 190, and the slab width deviation for storing the slab width deviation value calculated by the slab width deviation calculating means 107 over a long period of time. Accumulating means 108 and learning means 109 for calculating a learning control amount for correcting the slab width used for the preset calculation by the preset control means 101 using the value of the slab width deviation accumulated in the slab width deviation accumulating means 108 And.

Further, it is determined from the PDI table 190 that the slab 156 is the slab 156 after the start of charging (casting) or the thin slab continuous caster 161 changes the width setting value, and the adaptation unit 105 and the learning unit Switching means 110 for outputting information for switching output to 109 to the preset control means 101 is provided.
The plate width control apparatus 100 shown in FIG. 1 calculates a roll gap command value between the rolls 151r of the edger 151 using these configurations, and outputs a control command from the preset control means 101 to the edger 151.

Hereinafter, the configuration of each unit will be described in detail.
<Plate width estimation means 102>
Next, the plate width estimating means 102 for estimating the plate width of the rolled steel plate 157 will be described with reference to FIG. FIG. 3 is a flowchart showing the processing of the plate width estimating means 102.
In S31 of FIG. 3, the width reduction amount ΔW1 after rolling by the edger 151 (see FIG. 1) of E1 is calculated with respect to the width B0 of the slab 156 before rolling by the rough rolling mill 154. The width shrinkage amount ΔW1 is
ΔW1 = B0−Se (1)
However, Se: expressed by the roll gap of the edger 151.

In S32 and S33 in FIG. 3, the amount of spread in the horizontal rolling mill R1 in the rough rolling mill 154 is calculated. That is, in S32 of FIG. 3, the width spread amount ΔW2 (rectangle amount ΔW2) of the material to be rolled by horizontal rolling is calculated, and in S33 of FIG. A width spread amount (dogbone width spread amount, that is, a dog bone recovery amount ΔW3) due to recovery of the pressed end portion raised in the plate thickness direction in the plate width direction is calculated.
The amount of spread of the steel plate 157 of the material to be rolled in the horizontal rolling mill R1 is represented by the sum of these.
The rectangle amount ΔW2 in S32 of FIG. 3 is calculated by the following equation (2), and the dogbone recovery amount ΔW3 in S33 of FIG. 3 is calculated by the following equation (3).

ΔB_E＝Ｂ0−Ｓe
ただし B₀：スラブ幅
Ｂ：水平圧延機R1入側板幅（=Ｓe）
R_E：エッジャ151のロール径
Se：エッジャ151のロールギャップ
R：水平圧延機R1のワークロール半径
H：水平圧延機R1入側板厚
h：水平圧延機R1出側板厚

ΔB _E = B0−Se
B ₀ : Slab width
B: Horizontal rolling mill R1 entry side plate width (= Se)
R _E : Edger 151 roll diameter
Se: Edger 151 roll gap
R: Work roll radius of horizontal rolling mill R1
H: Thickness of horizontal rolling mill R1 entry side
h: Horizontal rolling mill R1 outlet thickness

ただし Ｂ：水平圧延機Ｒ２入側板幅
R：水平圧延機Ｒ２のワークロール半径
H：水平圧延機Ｒ２入側板厚
h：水平圧延機Ｒ２出側板厚 In S34 of FIG. 3, the width spread amount ΔW4 of the steel plate 157 of the material to be rolled in the horizontal rolling mill R2 shown in FIG. 1 is calculated by the following equation (4).

B: Horizontal rolling mill R2 entry side width
R: Work roll radius of horizontal rolling mill R2
H: Thickness of horizontal rolling mill R2 entry side
h: Horizontal rolling mill R2 outlet thickness

そして、Ｓ３６において、最終的な仕上げ後の鋼板157等の被圧延材の板幅Ｗcを、次の(６)式で推定する。Ｂ₀は、ＰＤＩテーブル190から取り込んだスラブ幅190dである。
Ｗc＝Ｂ0−ΔＷ1＋ΔＷ2＋ΔＷ3＋ΔＷ4−ΔＷ5 …(６)
以上が、板幅推定手段102の処理であり、(１)式〜(６)式を板幅予測モデル115(図１参照)と称する。
なお、(２)式〜(５)式は、公知の実験式である。 In S35 of FIG. 3, the width shrinkage amount ΔW5 between the edges which are both side edges of the steel plate 157 of the material to be rolled in the tandem rolling mills F1 to F5 of the finish rolling mill 155 is calculated by the following equation (5). .

In S36, the plate width Wc of the rolled material such as the steel plate 157 after final finishing is estimated by the following equation (6). B ₀ is the slab width 190d taken from the PDI table 190.
Wc = B0−ΔW1 + ΔW2 + ΔW3 + ΔW4−ΔW5 (6)
The above is the processing of the plate width estimation means 102, and the equations (1) to (6) are referred to as a plate width prediction model 115 (see FIG. 1).
Equations (2) to (5) are known empirical equations.

<Plate width deviation calculating means 103>
In the sheet width deviation calculating means 103 shown in FIG. 1, the actual rolled material measured by the sheet width meter 158 corresponding to the predicted value Wc of the rolled steel sheet 157 and the predicted value Wc of the rolled material after rolling. The deviation ΔWact of the plate width Wa of the steel plate 157 is calculated.

<Plate width deviation accumulating means 104>
FIG. 4 is a configuration diagram showing the configuration of the plate width deviation accumulating means 104.
The sheet width deviation accumulating means 104 shown in FIG. 4 is linked to information for specifying the latest rolled steel sheet 157, and the sheet width deviation ΔWact and the sheet width at the time of sheet width setup calculation. An amount (adaptive value) ΔWadap obtained by correcting the target value is stored.

  For example, in FIG. 4, in the coil (steel plate 157) of the material that was rolled last time, the plate width deviation was obtained as a result of the setup calculation with a correction (adaptive value ΔWadap) of −11 mm applied to the plate width target value. ΔWact is +3 mm. In addition, in the coil (steel plate 157) of the material to be rolled that was rolled two times in advance, the plate width deviation ΔWact was −1 mm as a result of the set-up calculation with a correction of −10 mm (adaptive value ΔWadap) applied to the target plate width value. It is shown that.

<Slab width reverse calculation means 106>
Next, from the rolling results of the rough rolling mill 154 and finish rolling mill 155 shown in FIG. 1 and the sheet width value of the rolled steel sheet 157 measured by the sheet width meter 158, the width of the slab 156 before rolling is calculated. The slab width reverse calculation means 106 for performing reverse calculation will be described.
FIG. 5 is a flowchart showing the processing of the slab width reverse calculation means 106.
In S51 of FIG. 5, from the sheet width Wa of the rolled steel sheet 157 measured by the sheet width meter 158 (see FIG. 1), the tandem rolling mill F1 input side of the finish rolling mill 155 (see FIG. 1). The plate width Wfin of the material to be rolled is calculated backward.

The plate width Wfin of the steel plate 157 to be rolled on the entry side of the tandem rolling mill F1 can be obtained by adding ΔW5 in the formula (5) to the plate width Wa of the steel plate 157 to be rolled after rolling.
Subsequently, in S52 of FIG. 5, the plate width Wr2 of the steel plate 157 of the material to be rolled on the entry side of the horizontal rolling mill R2 (see FIG. 1) is calculated backward. The plate width Wr2 at the entry side of the horizontal rolling mill R2 can be obtained by subtracting ΔW4 (see equation (4)) from the plate width Wfin at the entry side of the rolling mill F1.
In S53 of FIG. 5, the slab width B0 is calculated backward.
First, as shown in the following equation (7), from the sheet width Wr2 of the material to be rolled on the entry side of the horizontal rolling mill R2 (see FIG. 1), the gap Se of the roll 151r of the edger 151 and the equation (2) By subtracting the indicated horizontal rolling width spread amount (rectangle amount) ΔW2, a dog bone width spread amount (dogbone recovery amount) ΔW3 is obtained.

ΔW3 = Wr2-Se-ΔW2 (7)
By substituting ΔW3 into the equation (3) and solving for B0, the slab width B0 can be calculated backward.
Equation (3) cannot be solved algebraically with respect to B0, but numerical values are obtained by sequentially substituting values that can be taken as slab widths into the slab width B0 on the right side, and obtaining B0 that is closest to ΔW3 into which the calculation results are substituted. Easy to solve.
B0 obtained here is not a value directly corresponding to the discrepancy between the actual slab width and the slab width 190b specified in the PDI table 190, but includes the prediction error included in the equations (2) to (5). It goes without saying that the variation is a value that is aggregated to the mismatch between the slab width B0 and the indicated value (190b) of the PDI table 190.

<Slab width deviation accumulation means 108>
FIG. 6 is a configuration diagram showing the configuration of the slab width deviation accumulating means 108.
As shown in FIG. 6, the slab width deviation accumulating means 108 includes a slab width deviation corresponding to the rolled steel plate 157 for each target plate width 108a of the rolled steel plate 157 (the obtained slab width). 108c is a newest number 108b from the latest steel plate 157 of the material to be rolled, and is stored for a long period of time.
For example, as shown in FIG. 6, regarding the steel plate 157 having a target plate width of 900 mm, the previous rolling record shows that the slab width deviation is -6 mm, and the previous rolling record shows -3 mm.

<Switching means 110>
Next, the switching means 110 that outputs information for switching the output of the adaptation means 105 and the output of the learning means 109 to the preset control means 101 shown in FIG. 1 will be described.
The switching means 110 is the result of the adaptation means 105 (see FIG. 1) when the preset control means 101 of the sheet width control device 100 calculates the gap between the rolls 151r of the edger 151 that performs rolling in the sheet width direction of the slab 156. And the learning unit 109 (see FIG. 1) are selected to use one of the results.

FIG. 7 is a flowchart showing the processing executed by the switching unit 110.
First, in S71 of FIG. 7, the number of steel plates 157 to be rolled is taken from 190i of the PDI table 190 after starting charging (casting) or after changing the width of the mold 165 (see FIG. 1). The width of the mold 165 corresponds to the casting width of the thin slab continuous caster 161, and the width of the slab 156 is determined thereby.
Here, after the start of charging (casting) or after changing the width of the mold 165 (see FIG. 1), the width setting of the material to be rolled may be changed during charging, that is, during casting.

In S72 of FIG. 7, the correlation determination of the width of the slab 156 to be rolled next time is performed based on this value. That is, it is determined whether or not the width of the slab 156 to be rolled next time has a large correlation with the width of the slab 156 rolled most recently (for example, the previous time and several times before).
The magnitude of the correlation corresponds to the similarity of the width of the slab 156, that is, the temporal proximity, and is determined by whether or not the number of the steel plates 157 of the material to be rolled taken in S71 in FIG. 7 is smaller than a certain value.
Specifically, when the number of steel plates 157 to be rolled is small after the start of charging or after changing the width of the mold 165, it is determined that the correlation is small, and when it is not small, the correlation is large.

  For example, in the case of the first one after the start of casting, since a correlation cannot be expected with the sheet width deviation between the steel sheet 157 of the material to be rolled last time, the prediction error included in the expressions (2) to (5) Etc. should be compensated according to long-term trends. That is, when the number of steel plates 157 to be rolled is the first one after the start of charging or after the width of the mold 165 is changed, the previous rolling is performed before the rolling performed at the previous charge or the width of the mold 165 is changed. It is rolling, and data correlation cannot be expected. Therefore, it should be compensated according to the result of how much error it had from the data stored for a long time.

Therefore, in S73 of FIG. 7, the learning means 109 shown in FIG. 1 is activated. The learning means 109 refers to the slab width deviation 108c with respect to the corresponding target plate width 108a stored in the slab width deviation accumulating means 108 (see FIG. 6), and calculates the weighted average by processing according to the following equation (8). Then, the learning result Wt is calculated.
Wt = Σ (ωiΔSi) / Σωi (8)
Where ωi: Weighted value
ΔSi: Slab width deviation

  ω i is a weight value for each slab width deviation ΔSi, and may be all 1 or the weight value of the steel sheet 157 of the material rolled the most recently is increased, and the learning result Wt is emphasized with respect to the latest slab width deviation ΔSi. It is also possible to calculate. On the other hand, if the determination result is not the first, that is, the second or more, the slab 156 is cast with the same mold 165 width as the previously rolled steel plate 157, so that the next rolled steel plate 157 to be rolled next time. A large correlation can be expected with the plate width deviation between the two.

Therefore, in S74 of FIG. 7, the adaptation means 105 (see FIG. 1) is activated.
The adaptation means 105 calculates the adaptation result Wa by referring to the plate width deviation ΔWact of the sheet width deviation accumulation means 104 (see FIG. 4) calculated for the steel sheet 157 of the material to be rolled that has been rolled most recently.
The sheet width deviation accumulating means 104 may be referred to only the sheet width deviation of the rolled steel plate 157 rolled last time, or for the purpose of making the adaptation result a stable value, the latest several rolled steel plates. 157 plate width deviation ΔWact may be referred to. In the former case, the following equation (9) is used. In the latter case, the weighted average is calculated by the processing according to the following equation (10), and the adaptation result Wa is calculated.
In the setup calculation, since the plate width target value has already been corrected at the time of plate width setup calculation, the effect is offset by subtracting the adaptive value ΔWadap.

Wa = ΔCpre− (Wadap) pre (9)
However, ΔCpre: Sheet width deviation in the previous rolled steel sheet 157
(Wadap) pre: Adaptive value ΔWadap previously applied to the setup calculation of rolled steel sheet 157
Wa = Σ {ωi (ΔCi− (Wadap) i)} / Σωi (10)
Where ωi: Weighted value
ΔCi: Plate width deviation
(Wadap) i: Adaptive value

In S75 of FIG. 7, the fetch result is output to the preset control means 101.
In the present embodiment, whether to use the learning means 109 or the adaptation means 105 in S72 of FIG. 7 is determined according to the number of rollings after the start of charging (casting) or after changing the width of the mold 165. Either the number of rolling after the start of charging (casting) or the number of rolling after changing the width of the mold 165 may be used.
Normally, the number of rollings used in the determination of S72 in FIG. 7 is set to 1, and the learning means 109 is used for the first slab after the start of casting or after changing the mold width, and for the other cases. The output of the adaptation means 105 is used.

<Preset control means 101>
Next, the processing of the preset control means 101 for outputting the roll gap command value between the rolls 157r to the edger 151 shown in FIG. 1 will be described.
FIG. 8 is a flowchart showing the processing of the preset control means 101.
In S81 of FIG. 8, the output of the switching means 110 (see FIG. 1) is received, and the setup of the steel plate 157 of the material to be rolled next time is either a learning preset to be compensated by the learning means 109 or the adaptation means 105 It is determined whether it is an adaptive preset to which compensation is applied.

If it is determined in S81 of FIG. 8 that the learning preset is obtained, a value obtained by multiplying the learning result Wt (see equation (8)) by a predetermined gain α in accordance with the following equation (11) in S82 of FIG. Ws_cont is obtained by adding to the slab width (190b) Ws stored in 190 (see FIG. 2), and the following setup calculation is performed.
The gain α normally takes a value of 0 to 1, and a larger value can be set as the reliability of the learning result Wt is higher. When the reliability of the learning result Wt is extremely low, it is set to zero.
Ws_cont = Ws + α · Wt (11)

On the other hand, if it is determined in S81 in FIG. 8 that the preset is an adaptation preset, in S83, a value obtained by multiplying the adaptation result Wa (see the formula (9)) by a predetermined adaptive gain β according to the following formula (12) is set to PDI. Wc_cont is obtained by adding to the target plate width (190c) Wc_target stored in the table 190 (see FIG. 2), and the following setup calculation is performed.
As with the gain α, the adaptive gain β usually takes a value of 0 to 1 and is between the error coils (rolled steel plate 157) detected in the latest coil (rolled steel plate 157) ( A larger value can be set as ΔCi− (Wadap) i) (see equation (9)) has a larger correlation.

Wc_cont = Wc_target + β · Wa (12)
In S84 of FIG. 8, from the sheet thickness control means 180 (see FIG. 1), the rolling schedule (the horizontal rolling mills R1 and R2 and the tandem rolling mills F1 to F5 shown in FIG. Setting value of how many mm to roll), and the tension value of the steel plate 157 of the material to be rolled measured by a tension meter (not shown) between the stands of the tandem rolling mills F1 to F5.

In S85 of FIG. 8, a finish entry side plate width estimated value (shown in FIG. 1) is calculated from the target plate width Wc_cont using the plate width prediction model 115 (see FIG. 1) expressed by the above equations (1) to (6). (Estimated side plate width of finish rolling mill 155) is calculated.
The estimated value of the finish entry side plate width is obtained by adding ΔW5 in the equation (5) to the target plate width Wc_cont.

In S86 of FIG. 8, an exit side plate width estimated value We1b of the edger 151 (see FIG. 1) is calculated.
The estimated exit side width We1b of the edger 151 is the rectangle amount ΔW2 in the horizontal rolling mill R1 of the above formula (2) from the estimated finish side width of the strip obtained in S85, and the horizontal rolling mill R1 of the formula (3). It can be obtained by reducing the dog-bone recovery amount ΔW3 and the width spread amount ΔW4 in the horizontal rolling mill R2 of the equation (4).

The above processing is schematically shown in FIG. FIG. 9 is a schematic diagram showing the processing contents of S84 to S86 of the preset control means 101.
From the target plate width Wc_cont, a finish entry side plate width estimated value entering the tandem rolling mill F1 is calculated, and further, an E1 (edger 151) exit side plate width estimated value is calculated.
Next, in S87 of FIG. 8, an estimated exit side plate width We1f of the edger 151 obtained by applying an adjustable maximum width reduction amount to the width of the slab 156 is calculated.

In S88 of FIG. 8, it is determined whether or not the width can be built from the magnitude relationship between the two E1 (edger 151) exit side plate width estimated values We1b and We1f.
For example, when the steel plate 157 with a plate width of 910 mm after finish rolling is desired, when the target plate width is only 900 mm, the width cannot be created.
As shown in FIG. 9, the width can be created when We1b ≧ We1f, and when We1b <We1f, the target plate width cannot be obtained even with the maximum width reduction amount.
If it is determined in S88 of FIG. 8 that the width can be created, the roll gap of the edger 151 (distance between the rolls 151r) and the load applied to the edger 151 are calculated in S89 of FIG. Output.

  On the other hand, if it is determined in S88 in FIG. 8 that the width cannot be formed, in S810 in FIG. 8, the sheet thickness control means 180 (see FIG. 1) includes a rolling schedule (horizontal rolling machines R1, R2 shown in FIG. 1). The tandem rolling mills F1 to F5 are instructed to recalculate the setting of how many mm to what mm the steel plate 157 to be rolled is rolled.

In the first embodiment, the case where there is one thin slab continuous caster 161 has been described as an example, but a plurality of casting equipment (strands) (a plurality of thin slab continuous casters in the direction of the paper surface and the front and back surfaces in FIG. 1). 161 may be provided), and the slab 156 may be cast in parallel. In this case, a plate width deviation accumulating means 104 (see FIG. 1) is provided for each strand, and the adapting means 105 judges which strand the slab 156 is cast from, and the plate width deviation accumulating means corresponding to the strand. It is necessary to perform calculations using the data stored in 104. Even in such a case, the present invention can be similarly applied by the above-described configuration.
In the first embodiment, an example in which both the adaptation unit 105 and the learning unit 109 are provided and used by switching is shown. However, either one may be used at all times.

<< Second Embodiment >>
Next, the control system 2S of the second embodiment will be described.
FIG. 10 is a conceptual diagram showing a configuration of a control system 2S provided with an adaptive gain calculating means 1001 in the plate width control apparatus 100 according to the second embodiment of the present invention.
In the second embodiment, the plate width control device 100 of the first embodiment is provided with an adaptive gain calculating means 1001 for calculating an adaptive gain β (see equation (12)).

Since other configurations are the same as those in the first embodiment, the same components are denoted by the same reference numerals, and detailed description thereof is omitted.
The adaptive gain calculation means 1001 in the sheet width control apparatus 100 of the second embodiment is the sheet width deviation ΔWact of the steel sheet 157 rolled immediately before the sheet width deviation accumulation means 104 (see FIG. 4), for example, the previous time or several times before. The adaptive value ΔWadap is taken in and the adaptive gain β in the equation (12) is automatically optimized according to the magnitude of the correlation. A method for calculating the adaptive gain β will be described later.

<Adaptive gain calculation means 1001>
Next, the processing of the adaptive gain calculation unit 1001 of the plate width control apparatus 100 will be described.
FIG. 11 is a flowchart showing the processing executed by the adaptive gain calculation means 1001 of the second embodiment.
In S111 of FIG. 11, the adaptive gain calculating means 1001 takes in the contents of the plate width deviation accumulating means 104 (see FIG. 4) and generates the adaptive error sequence table shown in FIG. FIG. 12 is a diagram illustrating an adaptive error sequence table according to the second embodiment.

The first adaptive error sequence shown in FIG. 12 is a value obtained by subtracting the adaptive value ΔWadap from the plate width deviation ΔWact of the plate width deviation accumulating means 104 shown in FIG. 4, and the second adaptive error sequence shown in FIG. This is a value obtained by shifting the value of the first adaptive error series by one steel plate 157.
For example, in the sheet width deviation accumulating means 104 shown in FIG. 4, since the sheet width deviation is +3 m and the adaptive value is −11 mm in the previous rolling coil (the previously rolled steel plate 157), the correspondence of the first adaptive error series The value obtained is 14 mm. Similarly, it can be calculated as 9 mm and 17 mm. On the other hand, the second adaptive error sequence can be calculated as 9 mm, 17 mm,... By shifting the first error sequence.
Here, the correlation between the sheet width prediction errors related to the steel sheet 157 of the material to be rolled adjacently, that is, subsequently rolled, is expressed by a cross-correlation between the first adaptive error series and the second adaptive error series.

In general, when the correlation is large, the same prediction error as that obtained in the previous rolling is expected for the next rolling, so the adaptive gain β can be increased, and the plate width prediction error is actively compensated. it can. Conversely, when the correlation is small, the adaptive gain β cannot be increased. The adaptive gain calculation means 1001 sets the adaptive gain β by paying attention to this point.
In S112 of FIG. 11, the adaptive gain calculation means 1001 calculates the correlation of the plate width deviations of the most recently rolled coil (rolled steel plate 157).
That is, the cross-correlation Conv between the first adaptive error sequence and the second adaptive error sequence in the adaptive error sequence table shown in FIG. 12 is calculated by the following equation (13).

Conv = Cov (x, y) / (σx · σy) (13)
Where Cov (x, y): Covariance of the first adaptive error sequence and the second adaptive error sequence
σx: Variance of the first adaptive error sequence
σy: variance of second adaptive error sequence Here, when the cross-correlation Conv is large, the adaptive gain β can be increased.
In S113 of FIG. 11, the adaptive gain β is determined based on the obtained cross-correlation value.

The adaptive gain β may be calculated by, for example, equation (14).
β = K · Conv (14)
However, K: constant Note that, as described above, the adaptive gain β takes a value of 0 to 1, and a larger value is set as the correlation increases, and K plays a role of adjustment.
With the above calculation, the adaptive gain β can be automatically set to an appropriate value online by paying attention to the correlation of the adaptive error series of the sheet width prediction model 115 in the latest rolling.

<< Summary >>
As shown in FIGS. 1 and 10, the plate width of the steel plate 157 to be rolled is controlled by an edger 151 provided in the roughing mill 154. In general, the width of the slab 156 cast by the continuous casting machine (thin slab continuous casting machine 151) is determined by the width of the mold 165 of the casting machine, and there is little variation in the plate width between the continuously cast slabs 156.
Therefore, when the slab 156 cast like a mini mill is directly conveyed to the mill, there is a correlation between the plate widths of the continuously rolled slab 156. On the other hand, this correlation is lost when the width of the mold 165 is changed.

  In the present invention, paying attention to this point, in order to realize highly accurate sheet width control of the material to be rolled, the sheet width value detected by the sheet width meter 158 and the like in the material to be rolled such as the rolled steel sheet 157 and the rolling The slab width deviation calculating means 107 for calculating the deviation from the indicated value of the slab 156 width by calculating back the slab 156 width which is the material to be rolled before rolling from the actual results, and the slab width deviation accumulating means for accumulating the calculated slab width deviation. 108, a sheet width estimating means 102 for estimating the sheet width of the rolled steel sheet 157 from the slab 156 width and the rolling results, a sheet width deviation accumulating means 104 for accumulating the deviation between the estimated value and the actually obtained sheet width, and the slab The learning means 109 for learning the tendency of the slab 156 width deviation from the contents of the width deviation accumulating means 108, outputting the learning result, the plate width estimation error from the contents of the board width deviation accumulating means 104, and the adaptation for outputting the prediction result Means 105, the width of the slab 156 to be rolled and the width of the slab 156 rolled most recently. Focusing on the relationship, preset control that performs the plate width prediction calculation selectively using the output of the learning means and the output of the adaptation means, and calculates the set value of the edger 151 that is the operation end of the plate width control according to the prediction result Means 101 are provided.

<Effect>
According to the present invention, in the sheet width control in the hot rolling, the sheet width of the material to be rolled such as the steel sheet 157 can be controlled with high accuracy by simple calculation focusing on the correlation between the slab 156 widths rolled back and forth. Can do.

  It can be widely applied to sheet width control of hot rolling mills.

It is a conceptual diagram which shows the structure of the control system which has the board width control apparatus of 1st Embodiment of this invention. It is a figure which shows the structural example of the PDI table of 1st Embodiment. It is a flowchart which shows the process of the board width estimation means of 1st Embodiment. It is a block diagram which shows the structure of the board width deviation accumulation | storage means of 1st Embodiment. It is a flowchart which shows the process of the slab width reverse calculation means of 1st Embodiment. It is a block diagram which shows the structure of the slab width deviation accumulation | storage means of 1st Embodiment. It is a flowchart which shows the process which the switching means of 1st Embodiment performs. It is a flowchart which shows the process of the preset control means of 1st Embodiment. It is a schematic diagram which shows the processing content of S84-S86 of the preset control means of 1st Embodiment. It is a conceptual diagram which shows the structure of the control system provided with the adaptive gain calculation means in the board width control apparatus which concerns on 2nd Embodiment of this invention. It is a flowchart which shows the process which the adaptive gain calculation means of 2nd Embodiment performs. It is a figure which shows the adaptive error series table of 2nd Embodiment.

Explanation of symbols

100 Plate Width Control Device 101 Preset Control Unit 102 Plate Width Estimation Unit 104 Plate Width Deviation Accumulation Unit (Second Table)
105 Adaptation means 106 Slab width reverse calculation means 108 Slab width deviation accumulation means (first table)
109 Learning means 110 Switching means 115 Sheet width prediction model 150 Hot rolling mill 151 Edger 154 Rough rolling mill 155 Finish rolling mill 156 Slab (rolled material)
157 Steel plate (rolled material)
161 Thin slab continuous casting machine (continuous casting machine)
180 Plate thickness control means 190 PDI table 1001 Adaptive gain calculation means β Adaptive gain ΔWact deviation

Claims (10)

The material to be rolled after being controlled by an edger with respect to the slab of the material to be rolled, which has been cast by a continuous casting machine and entered the roughing mill, and then rolled by a finish rolling mill A sheet width control device for a hot rolling mill that controls the sheet width to be a target value,
A sheet width prediction model that stores the relationship between the width and rolling process of the slab and the sheet width of the rolled material after rolling;
From the indicated value of the width of the slab and the rolling information about the slab taken from the hot rolling mill, the sheet width of the material to be rolled after being rolled by a finish mill using the sheet width prediction model is estimated. Plate width estimation means to perform,
About the rolled material that has been rolled most recently, a plate width deviation accumulating unit that accumulates a deviation between an estimation result of the plate width estimating unit and a measured sheet width of the rolled material after rolling,
Adaptive means for correcting the target value of the sheet width of the material to be rolled after the next rolling based on the content of the sheet width deviation accumulation means;
Sheet width control for a hot rolling mill, comprising preset control means for calculating and outputting a control command to the edger by calculation using the target value of the sheet width corrected by the adaptation means apparatus. The material to be rolled after being controlled by an edger with respect to the slab of the material to be rolled, which has been cast by a continuous casting machine and entered the roughing mill, and then rolled by a finish rolling mill A sheet width control device for a hot rolling mill that controls the sheet width to be a target value,
A sheet width prediction model that stores the relationship between the width and rolling process of the slab and the sheet width of the rolled material after rolling;
From the actual measured value of the width of the rolled material after rolling and the rolling information about the rolled material taken in from the hot rolling mill, the sheet width prediction model is calculated backward to calculate the width of the slab before rolling the rolled material. Slab width estimating means for estimating the width;
Slab width deviation accumulating means for accumulating a deviation between an estimation result of the slab width estimating means and an indication value of the slab width;
Learning means for correcting an indication value of the width of the slab based on the content of the slab width deviation accumulating means;
Preset control means for calculating and outputting a control command to the edger for setting the sheet width of the rolled material after rolling by a calculation using the width of the slab corrected by the learning means. A sheet width control device for a hot rolling mill characterized by the above. The material to be rolled after being controlled by an edger with respect to the slab of the material to be rolled, which has been cast by a continuous casting machine and entered the roughing mill, and then rolled by a finish rolling mill A sheet width control device for a hot rolling mill that controls the sheet width to be a target value,
A sheet width prediction model that stores the relationship between the width and rolling process of the slab and the sheet width of the rolled material after rolling;
From the indication value of the width of the slab and the rolling information about the slab taken from the hot rolling mill, the sheet width of the material to be rolled after being rolled by the finish rolling mill using the sheet width prediction model A plate width estimating means for estimating;
About the rolled material that has been rolled most recently, a plate width deviation accumulating unit that accumulates a deviation between an estimation result of the plate width estimating unit and a measured sheet width of the rolled material after rolling,
Adaptive means for correcting the target value of the sheet width of the material to be rolled after the next rolling based on the content of the sheet width deviation accumulation means;
The width of the slab before rolling of the material to be rolled by back-calculating the sheet width prediction model from the actual measured value of the width of the material to be rolled after rolling and the rolling information about the material to be rolled taken from the hot rolling mill. Slab width estimation means for estimating
Slab width deviation accumulating means for accumulating a deviation between an estimation result of the slab width estimating means and an indication value of the slab width;
Learning means for correcting an indication value of the width of the slab based on the content of the slab width deviation accumulating means;
Calculate and output a control command to the edger for setting the sheet width of the material to be rolled after the rolling to a target value by calculation using either the output of the learning means or the output of the adaptation means. A sheet width control device for a hot rolling mill, comprising: preset control means for performing Switching means for switching the output of the learning means and the output of the adaptation means to output to the preset control means;
The switching means takes in the number of rolls after the start of casting of the continuous casting machine, selects the output of the learning means when the number of rolling is less than a certain value, and selects the output of the adaptation means otherwise. The sheet width control device for a hot rolling mill according to claim 3, wherein the sheet width is output to the preset means. Switching means for switching the output of the learning means and the output of the adaptation means to output to the preset control means;
The switching means takes in the number of rollings after the start of casting after the continuous casting machine has changed the mold width, selects the output of the learning means when the number of rollings is below a certain value, otherwise The sheet width control device for a hot rolling mill according to claim 3, wherein the output of the adaptation means is selected and output to the preset means. Switching means for switching the output of the learning means and the output of the adaptation means to output to the preset control means;
The switching means takes in the number of rollings after the start of casting of the continuous casting machine or after changing the mold width, and selects the output of the learning means when the number of rollings is less than a certain value, otherwise The sheet width control device for a hot rolling mill according to claim 3, wherein the output of the adaptation means is selected and output to the preset means. Switching means for switching the output of the learning means and the output of the adaptation means to output to the preset control means;
The switching means determines the similarity with the width of the slab that has been most recently rolled to the width of the slab to be rolled next time, and when the similarity is a predetermined value or less, selects the output of the learning means, In other cases, the sheet width control device for a hot rolling mill according to claim 3, wherein the output of the adaptation means is selected and output to the preset means. Adaptation means for calculating a correction amount of the sheet width target value of the material to be rolled next time using a value obtained by multiplying the sheet width deviation extracted from the sheet width deviation accumulation means by an adaptive gain, and an output of the adaptation means A hot rolling mill comprising preset control means for calculating and outputting a control command to the edger for realizing a target width value of the rolled material after rolling using the target width corrected using Board width control device,
From the contents of the sheet width deviation accumulating means, an adaptive gain calculating means for obtaining the magnitude of the correlation of the sheet width deviation in the rolled material rolled back and forth, and determining the adaptive gain based on the magnitude of the correlation; The sheet width control device for a hot rolling mill according to any one of claims 1 or 3 to 7, further comprising: The adaptive gain calculating means calculates a large adaptive gain when the correlation of the sheet width deviation in the rolled material rolled back and forth is large, and calculates the plate width deviation in the rolled material rolled back and forth. The apparatus for controlling the plate width of a hot rolling mill according to claim 8, wherein the adaptive gain is calculated when the correlation is small. The material to be rolled after being controlled by an edger with respect to the slab of the material to be rolled, which has been cast by a continuous casting machine and entered the roughing mill, and then rolled by a finish rolling mill A sheet width control method of a sheet width control device of a hot rolling mill for controlling the sheet width to be a predetermined value,
Stores the relationship between the width of the slab and the rolling process and the width of the rolled material after rolling,
From the measured value of the width of the rolled material after rolling and the rolling information about the rolled material taken from the hot rolling mill, the relationship between the width of the slab and the rolling process and the width of the rolled material after rolling To calculate the width of the slab before rolling of the material to be rolled,
The deviation between this estimation result and the indicated value of the slab width is accumulated in the first table,
Using the indicated value of the width of the slab and the rolling information about the slab taken from the hot rolling mill, the relationship between the width of the slab and the rolling process and the sheet width of the rolled material after rolling, and rolling in the finish rolling mill Estimated the width of the rolled material after being
For the material to be rolled most recently, the deviation between the sheet width estimation result and the sheet width actual measurement value is calculated and accumulated in the second table,
Take the number of rolling after the start of casting of the continuous casting machine or after changing the mold width,
When the number of rolling is below a certain value, correct the indication value of the width of the slab to be rolled next time according to the contents of the first table,
When the rolling number is larger than a certain value, the sheet width target value of the material to be rolled next time according to the contents of the second table is corrected,
According to the correction result, a control command to the edger for controlling the sheet width of the rolled material after rolling to a predetermined value is calculated and output. Board width control method.

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