JP2003305509A - Sheet width controller of material to be rolled in continuous hot rolling and method for controlling sheet width - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To scarcely allow an uncontroable area to appear in a material to be rolled. <P>SOLUTION: A pre-stage gauge controller 32 controls tension adjusting instruments TC to adjust each tension between respective stands on the side which is more upstream than the middle position, for bringing the gauge of the steel plate M measured with a width gauge 11 in the middle position of a row of rolling stands nearer a target value. A post-stage gauge controller 3 controls tension adjusting instruments TC to adjust each tension between respective stands on the side which is more downstream side than the middle position, for bringing the gauge of the steel plate M measured with a width gauge 12 at the outlet side of the row of the rolling stands nearer a target value. A pre-stage target gauge modifier 4 outputs the modified amount of the target value of the gauge to be imparted to the pre-stage gauge controller 2 by using a low frequency component of deviation between the gauge of the steel plate M and a target value thereof irrespective of the tension between the respective stands on the side which is more downstream than the middle position. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a strip width control device and strip width control method for a material to be rolled in hot continuous rolling.

[0002]

2. Description of the Related Art When performing hot continuous rolling using a continuous rolling mill having a rolling stand row composed of a plurality of rolling stands, the material to be rolled between rolling stands is controlled in order to control the strip width of the material to be rolled. Techniques for adjusting the tension of the are known. For example, in Japanese Unexamined Patent Publication No. 9-24404, the strip width of a material to be rolled is measured at an intermediate position and an exit position of a rolling stand row, and the strip width measured at the intermediate position and a target set at the intermediate position. Based on the deviation from the value (intermediate strip width deviation), the tension between the rolling stands on the upstream side (preceding stage) of the intermediate position was adjusted so that this deviation became zero, and it was measured at the exit side position. Based on the deviation between the strip width and the target value set at the delivery side position (delivery side strip width deviation), adjust the tension between the rolling stands on the downstream side (post stage) of the intermediate position so that this deviation becomes zero. At the same time, when the tension in the subsequent stage reaches the upper limit value, the moving average value of the output side plate width deviation (the average value calculated by gradually shifting the calculation range so as to partially overlap) is added to the intermediate plate width deviation. Such a technique is disclosed. According to the technique of this publication, the tension is adjusted at two positions, that is, the intermediate position and the delivery side position, so that the strip width control amount can be made large, and the tension adjustment capability of the rolling stand at the rear stage can be insufficient. Can be supplemented with.

[0003]

However, in the technique of the above publication, since the moving average value of the exit side plate width deviation is added to the intermediate plate width deviation after the tension in the latter stage reaches the upper limit value, the latter stage It becomes impossible to control substantially the strip width of the rolled material. Moreover, even for the material to be rolled, which is located at a position close to the intermediate position of the former stage at that time, the plate width cannot be substantially controlled in the latter stage because it reaches the intermediate position without sufficient plate width control. It may happen.

Further, it is known that the strip width of the material to be rolled is proportional to the power of the tension, and as shown in FIG. 14, the strip width variation width (influence coefficient) when the tension variation width is constant. It increases dramatically as the tension level increases. Therefore, in the technique of the above publication, when the plate width is controlled based on a constant control gain adjusted with the tension lower limit value being set as a set tension, when the tension level increases, the amplitude of the plate width variation may become too large. is there. In other words, as in the technique of the above publication, when the intermediate plate width deviation that is the basis for adjusting the tension between the rolling stands of the preceding stage is corrected after the tension reaches the upper limit value, in some cases, the rolling stand of any of the succeeding stages is corrected. The inter-tension also has a high value, and as a result, the amplitude of the plate width fluctuation in the subsequent stage may be increased. In order to avoid this, when the amplitude is controlled based on the control gain adjusted near the tension upper limit value, the response of the control system deteriorates significantly when the tension level decreases. On the other hand, if the width of the upper and lower limit values of the tension in the latter stage is made smaller, the above-mentioned problem is alleviated, but the plate width correcting ability in the latter stage is reduced.

Therefore, an object of the present invention is to provide a strip width control device and strip width control method in which there is almost no region where the material to be rolled becomes substantially uncontrollable.

Another object of the present invention is to provide a plate width control device and a plate width control method in which the amplitude of the plate width fluctuation is relatively small and the plate width correction capability does not decrease.

[0007]

In order to achieve the above object, in the strip width control device according to the first aspect, the strip width of the material to be rolled at the intermediate position of the rolling stand row consisting of a plurality of rolling stands is a target value. So as to come closer to the pre-stage strip width control means for adjusting the tension between the rolling stands on the upstream side of the intermediate position, and the strip width of the material to be rolled at the final rolling stand exit side position of the rolling stand row. So as to approach the target value, the subsequent plate width control means for adjusting the tension between rolling stands on the downstream side of the intermediate position, and the value of the tension between rolling stands on the downstream side of the intermediate position. Regardless of the above, based on the deviation between the strip width of the material to be rolled at the exit side position of the final rolling stand and its target value, the pre-stage for correcting the strip width target value given to the pre-stage strip width control means. And a target width correction means.

According to a twelfth aspect of the present invention, in the strip width control method, the strip width of the material to be rolled at the intermediate position of the rolling stand row consisting of a plurality of rolling stands approaches the target value so that the strip width is upstream of the intermediate position. Pre-stage plate width control means for adjusting the tension between each rolling stand, and so that the plate width of the material to be rolled at the final rolling stand exit side position of the rolling stand row approaches the target value, downstream from the intermediate position. In the plate width control method of the material to be rolled in the hot continuous rolling in which the plate width of the material to be rolled is controlled by the latter-stage plate width control means for adjusting the tension between the rolling stands on the side, rather than the intermediate position. Regardless of the value of the tension between each rolling stand on the downstream side, based on the deviation between the strip width of the material to be rolled at the final rolling stand exit side position and its target value, it is given to the preceding strip width control means. Correct the target value of board width It is intended.

According to claims 1 and 12, the target value of the plate width given to the preceding plate width control means is based on the outlet plate width deviation regardless of the value of the tension between the rolling stands on the downstream side of the intermediate position. The tension between the post-rolling stands almost never reaches the upper limit value or the lower limit value.
Therefore, an uncontrolled region hardly occurs in the rolled material, and a rolled material having a good strip width can be obtained over substantially the entire length of the strip.

In the strip width control device according to a second aspect of the present invention, the preceding stage target width correction means is based on a low frequency component of a deviation between the strip width of the material to be rolled at the final rolling stand exit side position and its target value. The target value of the plate width given to the preceding plate width control means is corrected. Further, the strip width control method according to claim 13 provides the preceding strip width control means based on a low frequency component of a deviation between the strip width of the material to be rolled at the final rolling stand exit side position and its target value. It is characterized in that the target value of the board width to be corrected is corrected.

According to claims 2 and 13, by feeding back the low frequency component of the outlet side plate width deviation to the preceding stage plate width control means, it is possible to perform more stable plate width control ignoring high frequency components such as noise. Become.

In the strip width control device according to a third aspect of the present invention, the preceding stage target width correction means is proportional to the deviation between the strip width of the material to be rolled at the final rolling stand exit side position and its target value or its low frequency component. It is characterized in that an integral control amount is calculated and the target value of the plate width given to the preceding stage plate width control means is corrected by using the proportional integral control amount as a correction amount. The strip width control method according to claim 14, wherein a proportional integral control amount is calculated from a deviation between the strip width of the material to be rolled at the final rolling stand exit side position and its target value or a low frequency component thereof, and the proportional integral control is performed. The target value of the plate width given to the preceding plate width control means is corrected by using the amount as a correction amount.

According to the third and fourteenth aspects, by performing the proportional-plus-integral control based on the output side plate width deviation or the low frequency component thereof, it is possible to perform the plate width control with high accuracy without control deviation.

In the strip width control device according to a fourth aspect of the present invention, the preceding stage target width correcting means is based on a deviation between the strip width of the material to be rolled at the final rolling stand exit side position and its target value or its low frequency component. Then, the target value of the plate width given to the preceding plate width control means is corrected by one shot. The strip width control method according to claim 15 is applied to the preceding strip width control means based on a deviation between a strip width of the material to be rolled at the final rolling stand exit side position and a target value thereof or a low frequency component thereof. The feature is that the target value of the plate width is corrected by one shot.

According to the present invention, the target value of the plate width given to the preceding plate width control means is corrected by one shot based on the output side plate width deviation or the low frequency component thereof, so that the plate width can be quickly set. It can approach the value. In the present specification, the one-shot correction means that the target value of the plate width is corrected not once but with a relatively large width within a short time (for example, instantaneously) only once. To do.

According to a fifth aspect of the present invention, in the strip width control device, the strip width of the material to be rolled at the intermediate position of the rolling stand row composed of a plurality of rolling stands approaches the target value so that the strip width is higher than the intermediate position. Pre-stage plate width control means for adjusting the tension between each rolling stand, so that the plate width of the material to be rolled at the final rolling stand exit side position of the rolling stand row approaches the target value,
A rear plate width control means for adjusting the tension between rolling stands on the downstream side of the intermediate position, and regardless of the value of the tension between rolling stands on the downstream side of the intermediate position,
Based on the deviation between the tension between rolling stands on the downstream side of the intermediate position and the target value thereof, a pre-stage target width correction means for correcting the target value of the strip width given to the pre-stage strip width control means. Is equipped with.

According to the strip width control method of the sixteenth aspect, the strip width on the upstream side of the intermediate position is set so that the strip width of the material to be rolled at the intermediate position of the rolling stand row consisting of a plurality of rolling stands approaches the target value. Pre-stage plate width control means for adjusting the tension between each rolling stand, and so that the plate width of the material to be rolled at the final rolling stand exit side position of the rolling stand row approaches the target value, downstream from the intermediate position. In the plate width control method of the material to be rolled in the hot continuous rolling in which the plate width of the material to be rolled is controlled by the latter-stage plate width control means for adjusting the tension between the rolling stands on the side, rather than the intermediate position. Regardless of the value of the tension between rolling stands on the downstream side, based on the deviation between the tension between rolling stands on the downstream side of the intermediate position and its target value, the plate given to the preceding plate width control means. Fixed width target Is shall.

According to claims 5 and 16, the target value of the strip width given to the preceding strip width control means is on the downstream side of the intermediate position regardless of the value of the tension between rolling stands on the downstream side of the intermediate position. Since it is corrected on the basis of the deviation between the tension between each rolling stand and its target value (post-stage tension deviation), there is almost no uncontrolled area in the material to be rolled, and the material with a good strip width over the entire strip length is generated. The rolled material can be obtained, and the post-plate width control means can perform appropriate control in the vicinity of the set tension, so that the amplitude of the plate width fluctuation at the final rolling stand exit side position can be reduced. Moreover, since it is not necessary to reduce the width of the upper and lower limit values of the tension in the latter stage, the plate width correction ability in the latter stage does not decrease.

In the strip width control device according to a sixth aspect of the present invention, the front-stage target width correction means is based on a low-frequency component of the deviation between the tension between each rolling stand on the downstream side of the intermediate position and its target value. The target value of the plate width given to the preceding plate width control means is corrected. The strip width control method according to claim 17, wherein the strip width provided to the preceding strip width control means is based on a low-frequency component of a deviation between the tension between rolling stands on the downstream side of the intermediate position and its target value. It is characterized by correcting the target value of.

According to claims 6 and 17, by feeding back the low-frequency component of the rear-stage tension deviation to the front-stage plate width control means, it is possible to perform more stable plate width control ignoring high-frequency components such as noise. .

According to a seventh aspect of the present invention, in the strip width control device, the front stage target width correction means is proportionally integrated from the deviation between the tension between each rolling stand on the downstream side of the intermediate position and its target value or its low frequency component. It is characterized in that the control amount is calculated and the target value of the plate width given to the preceding stage plate width control means is corrected by using the proportional-plus-integral control amount as a correction amount. The strip width control method according to claim 18, wherein a proportional-integral control amount is calculated from a deviation between the tension between rolling stands on the downstream side of the intermediate position and a target value thereof or a low-frequency component thereof, and the proportional-integral control amount is calculated. Is used as a correction amount to correct the target value of the plate width given to the preceding plate width control means.

According to the seventh and the eighteenth aspects, by performing the proportional-plus-integral control based on the latter-stage tension deviation or the low-frequency component thereof, it is possible to perform the plate width control with high accuracy without a control deviation.

According to the strip width control device of claim 8, the strip width of the material to be rolled at the intermediate position of the rolling stand row composed of a plurality of rolling stands approaches the target value at the upstream side of the intermediate position. Pre-stage plate width control means for adjusting the tension between each rolling stand, so that the plate width of the material to be rolled at the final rolling stand exit side position of the rolling stand row approaches the target value,
A rear plate width control means for adjusting the tension between rolling stands on the downstream side of the intermediate position, and regardless of the value of the tension between rolling stands on the downstream side of the intermediate position,
Deviation between the strip width of the material to be rolled at the final rolling stand exit side position and its target value, and, based on the deviation between the rolling stand tensions at the downstream side of the intermediate position and its target value, Front stage target width correction means for correcting the target value of the strip width given to the front stage strip width control means.

According to a strip width control method of a nineteenth aspect, the strip width on the upstream side of the intermediate position is set so that the strip width of the material to be rolled at the intermediate position of the rolling stand row consisting of a plurality of rolling stands approaches the target value. Pre-stage plate width control means for adjusting the tension between each rolling stand, and so that the plate width of the material to be rolled at the final rolling stand exit side position of the rolling stand row approaches the target value, downstream from the intermediate position. In the plate width control method of the material to be rolled in the hot continuous rolling in which the plate width of the material to be rolled is controlled by the latter-stage plate width control means for adjusting the tension between the rolling stands on the side, rather than the intermediate position. Regardless of the value of the tension between each rolling stand on the downstream side, the deviation between the plate width of the material to be rolled at the final rolling stand exit side position and its target value, and each on the downstream side of the intermediate position Tension between rolling stands and its eyes Based on the deviation between the value is for correcting the target value of plate width to be applied to said front plate width control means.

According to claims 8 and 19, regardless of the value of the tension between the rolling stands on the downstream side of the intermediate position, the target value of the strip width given to the preceding strip width control means is Since it is corrected based on the latter stage tension deviation,
There is almost no uncontrolled region in the rolled material, so that it is possible to obtain a rolled material with a better strip width over the entire length of the strip, and it is possible to perform appropriate control near the set tension in the post strip width control means. Therefore, it is possible to reduce the amplitude of the strip width fluctuation at the exit side position of the final rolling stand, and prevent the strip width correction ability from being deteriorated in the subsequent stage.

According to a ninth aspect of the present invention, in the strip width control device, the front stage target width correction means has a low frequency component of a deviation between the strip width of the material to be rolled at the final rolling stand exit side position and its target value, and
Based on the low frequency component of the deviation between the tension between rolling stands on the downstream side of the intermediate position and its target value, the target value of the strip width given to the preceding strip width control means is corrected. There is. The strip width control method according to claim 20, wherein a low-frequency component of a deviation between the strip width of the material to be rolled at the final rolling stand exit side position and its target value, and each rolling on the downstream side of the intermediate position. It is characterized in that the target value of the plate width given to the preceding plate width control means is corrected based on the low frequency component of the deviation between the stand tension and its target value.

According to claims 9 and 20, by feeding back the low-frequency components of the outlet-side strip width deviation and the rear-stage tension deviation to the front-stage strip width control means, more stable strip width control in which high-frequency components such as noise are ignored. Will be able to.

In the strip width control device according to the tenth aspect of the present invention, the front stage target width correction means is a deviation between the strip width of the material to be rolled at the final rolling stand exit side position and its target value or its low frequency component, and , The proportional-integral control amount is calculated from the deviation between the tension between rolling stands on the downstream side of the intermediate position and its target value or its low-frequency component, and the preceding-stage strip width control is performed with the proportional-integral control amount as a correction amount. It is characterized in that the target value of the plate width given to the means is corrected. 22. The strip width control method according to claim 21, wherein the deviation between the strip width of the material to be rolled and the target value thereof at the final rolling stand exit side position or a low frequency component thereof, and each of the downstream side of the intermediate position. A proportional integral control amount is calculated from the deviation between the tension between rolling stands and its target value or its low frequency component, and the target value of the strip width given to the preceding strip width control means is corrected with the proportional integral control amount as a correction amount. It is characterized by doing.

According to the tenth and twenty-first aspects, by performing proportional-plus-integral control based on the outlet side plate width deviation or its low frequency component and the rear stage tension deviation or its low frequency component, there is no control deviation and highly accurate plate width control. Will be able to.

In the strip width control device according to the eleventh aspect of the present invention, the front stage target width correcting means is a deviation between the strip width of the material to be rolled at the exit side position of the final rolling stand and its target value or its low frequency component, and , The one-shot correction of the target value of the strip width given to the preceding strip width control means on the basis of the difference between the tension between the rolling stands on the downstream side of the intermediate position and its target value or its low frequency component It is characterized by that. The strip width control method according to claim 22, wherein the deviation between the strip width of the material to be rolled at the final rolling stand exit side position and its target value, or its low-frequency component, and each at the downstream side of the intermediate position. It is characterized in that the target value of the strip width given to the preceding strip width control means is corrected by one shot based on the deviation between the tension between rolling stands and its target value or its low frequency component.

According to the eleventh and twenty-second aspects, the target value of the plate width given to the front plate width control means is one-shot corrected based on the output plate width deviation or its low frequency component and the rear plate tension deviation or its low frequency component. Therefore, the plate width can be quickly brought close to the target value.

[0032]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic view of a strip width control apparatus for executing a strip width control method according to a first embodiment of the present invention and a hot continuous rolling mill controlled by the strip width control apparatus. A steel plate M, which is a material to be rolled whose plate width is controlled by the plate width control device 1, is conveyed from the left to the right in the drawing and has a rolling stand row including seven rolling stands F1 to F7. Rolled by 20. Rolling stands F1 to F
Each of 7 is driven by a motor (not shown). Six rolling stands F except the final rolling stand F7
1 to F6 are each provided with a tension adjuster TC including a looper or the like for adjusting the tension applied to the steel sheet M between each rolling stand and the rolling stands adjacent thereto. Between the rolling stand F3 and the rolling stand F4 (intermediate position), and the exit side of the rolling stand F7 (outgoing position).
Includes a width measuring device (width meter) 1 for measuring the width of the steel plate M.
1 and 12 are arranged.

The plate width control device 1 includes two width gauges 11, 1
In addition to 2, the front plate width controller 2, the rear plate width controller 3,
It includes a preceding target width corrector 4, two subtractors 6 and 7, and one adder 8. The front plate width controller 2 subtracts the value (intermediate plate width deviation) obtained by subtracting the plate width at the intermediate position measured by the width meter 11 from the target value of the plate width at the intermediate position (F3 target width). Are supplied from the rolling mills F1, F2, F3 at the upstream stage upstream of the intermediate position.
The three tension adjusters TC according to (1) are controlled at a constant control cycle so that the plate width at the intermediate position measured by the width gauge 11 approaches the F3 target width.

The rear plate width controller 3 subtracts the plate width at the outlet position measured by the width meter 12 from the target value of the plate width at the outlet position (F7 target width) (outlet plate width deviation). ) Is supplied from the subtractor 6 to control the three tension adjusters TC related to the rolling stands F4, F5, F6 in the subsequent stage located downstream of the intermediate position in every constant control cycle, and the width meter 12 The board width at the exit position measured in step S1 should be close to the target width F7.

As will be described in detail later, the former stage target width corrector 4 does not depend on the value of the tension between rolling stands on the downstream side of the intermediate position (the tension between rolling stands reaches the upper limit value or the lower limit value). Even if not), the correction amount of the F3 initial target width is derived based on the output side plate width deviation supplied from the subtractor 6. The correction amount of the F3 initial target width derived by the preceding target width modifier 4 is added to the F3 initial target width in the adder 8. Then, a value (intermediate plate width deviation) obtained by subtracting the plate width at the intermediate position measured by the width meter 11 from the F3 target value corrected by the addition in the adder 8 is the front plate width controller 2
Is supplied to.

In the present embodiment, the front plate width controller 2, the three tension adjusters TC controlled by the front plate width controller 2, the subtractor 7 and the width meter 11 constitute front plate width control means. Further, the rear plate width controller 3, the three tension adjusters TC controlled by the latter, the subtractor 6, and the width meter 12 constitute a rear plate width control means. Further, the width meter 12, the subtractor 6, the pre-stage target width correction device 4, and the adder 8 constitute a pre-stage target width correction means.

FIG. 2 is a block diagram showing the internal structure of the preceding target width corrector 4. The former target width corrector 4 includes a low-pass filter 14 and a proportional-plus-integral controller 15. The low-pass filter 14 removes high-frequency components having a frequency higher than the cut-off frequency from the output-side plate width deviation supplied to the front-stage target width corrector 4 and extracts only low-frequency components having a frequency lower than the cut-off frequency. It By using the low-pass filter 14, high-frequency components are removed from the exit side plate width deviation, so that the control system becomes unstable due to the time (dead time) required to convey the steel plate M from the intermediate position to the exit side position. Can be suppressed.

The experiment conducted by the present inventor found that the cutoff frequency at this time is preferably a value of 1/3 to 1/5 of the dead time from the rolling stand F3 to the rolling stand F7. ing. Rolling stand F3
The dead time from the rolling stand F7 to the rolling stand F7 can be calculated from the distance from the rolling stand F3 to the rolling stand F7, and the roll speed and the advance rate between them.

The proportional-plus-integral controller 15 calculates the proportional-plus-integral control amount based on the low-frequency component of the output side plate width deviation output from the low-pass filter 14, and modifies the calculated proportional-plus-integral control amount to the F3 initial target width. Output as a quantity. By using the proportional-plus-integral controller 15, it is possible to perform highly accurate strip width control without control deviation.

[0041]

[Equation 1]

The above expression (1) is an expression representing the calculation performed by the preceding target width corrector 4 and the adder 8. Formula (1)
, B3aim is the F3 target width, B03aim is the F3 initial target width, B7aim is the F7 target width, B7 is the strip width at the exit side of the rolling stand F7, LPF (*) is a low-pass filter, Kp is a proportional gain, and Ki is an integral gain. , S mean Laplace integral operators, respectively.

Incidentally, as shown by the broken line in FIG.
The front-stage target width corrector 4 may output the supplied outlet-side plate width deviation as it is, output it after passing only the low-pass filter 14, or output it after passing only the proportional-plus-integral controller 15. You may.

FIG. 3 shows a hot continuous rolling apparatus 20 shown in FIG.
When the strip width of the steel sheet M rolled by is controlled by the strip width control device 1, the strip width at the intermediate position (F3
It is a graph which shows the simulation result of the board width (F7 width) in the width side) and the exit side position. In addition, FIG. 4 is a graph showing a state of tension change in the subsequent rolling stand at that time. On the other hand, FIG. 5 shows a hot continuous rolling apparatus 20 shown in FIG.
10 shows simulation results of the plate width (F3 width) at the intermediate position and the plate width (F7 width) at the exit position when the target value of the plate width (F3 target width) of the steel plate M rolled by is not changed. It is a graph. Further, FIG. 6 is a graph showing a state of tension change in the subsequent rolling stand at that time.

In FIG. 3, the curve 31 is the F3 target width, the curve 32 is the F7 target width, the curve 33 is the F3 width, and the curve 34 is F.
Each of the seven widths is shown over time. A curved line 35 drawn by a broken line shows a time change of the F7 width when a similar simulation is performed based on the technique described in Japanese Patent Laid-Open No. 9-24404. Also, FIG.
In, the curve 41 shows the time change of the tension between the post-rolling stands. A curved line 42 drawn by a broken line shows a temporal change in tension between the post-rolling stands in the post-rolling stand when a similar simulation is performed based on the technique described in JP-A-9-24404. .

In FIG. 5, the curve 51 is the F3 target width, the curve 52 is the F7 target width, the curve 53 is the F3 width, and the curve 54 is F.
Each of the seven widths is shown over time. Further, in FIG. 6, a curve 61 shows the time change of the tension between the post-rolling stands.

Comparing the curve 41 of FIG. 4 with the curve 61 of FIG. 6, it can be seen that the tension is not saturated in the curve 41, but the tension is saturated in the latter half of the curve 61. That is, when the strip width control device 1 of the present embodiment is used, the F3 target value given to the preceding strip width controller 2 is output regardless of the value of the tension between rolling stands on the downstream side of the intermediate position. Since the tension between the post-rolling stands reaches the upper limit value or the lower limit value almost completely because it is corrected based on the side plate width deviation, there is almost no uncontrolled region in the rolled material, and the entire plate length It can be understood that it becomes possible to obtain a material to be rolled having a good strip width.

Further, by comparing FIG. 3 and FIG. 5, it is understood that according to the present embodiment, the plate width at the exit side position can be quickly brought close to the F7 target width.
This is because the high-frequency component of the output side plate width deviation is removed by the low-pass filter 14, so that more stable plate width control can be performed while ignoring high-frequency components such as noise. Furthermore, it is understood from these drawings that according to the present embodiment, the plate width at the exit side position can be accurately brought close to the F7 target width. This is because the proportional-plus-integral control amount calculated by the proportional-plus-integral controller 15 is used as the correction amount of the F3 target value.

Next, a second embodiment of the present invention will be described. FIG. 7: is a schematic diagram of the strip width control apparatus and the hot continuous rolling mill controlled by this which implement the strip width control method by the 2nd Embodiment of this invention. A steel plate M, which is a material to be rolled whose plate width is controlled by the plate width control device 71, is conveyed from the left to the right in the drawing and has a rolling stand row including seven rolling stands F1 to F7. Rolled by 20. Rolling stands F1 to F
Each of 7 is driven by a motor (not shown). Six rolling stands F except the final rolling stand F7
1 to F6 are each provided with a tension adjuster TC including a looper or the like for adjusting the tension applied to the steel sheet M between each rolling stand and the rolling stands adjacent thereto. Between the rolling stand F3 and the rolling stand F4 (intermediate position), and the exit side of the rolling stand F7 (outgoing position).
Includes a width measuring device (width meter) 1 for measuring the width of the steel plate M.
1 and 12 are arranged. Further, between the rolling stand F4 and the rolling stand F5, between the rolling stand F5 and the rolling stand F6, and between the rolling stand F6 and the rolling stand F7, the tension of the steel sheet M (σ4, σ5, σ6) Tension measuring devices (or tension estimators) 77, 78, 79 for measuring or estimating are respectively arranged.

The board width control device 71 includes two width gauges 11,
12 and 3 tension measuring devices (or tension estimators) 7
In addition to 7, 78, 79, the front plate width controller 2, the rear plate width controller 3, the front target width modifier 74, the three subtractors 6, 7, 75, and the one adder 8 are provided. include. The front plate width controller 2 subtracts the value (intermediate plate width deviation) obtained by subtracting the plate width at the intermediate position measured by the width meter 11 from the target value of the plate width at the intermediate position (F3 target width). Is supplied from the intermediate position, the three tension adjusters TC of the upstream rolling stands F1, F2, F3 located upstream of the intermediate position are controlled at a constant control cycle, and the intermediate width measured by the width gauge 11 is measured. The plate width at the position should be close to the F3 target width.

The post-stage plate width controller 3 subtracts the plate width at the outlet side position measured by the width gauge 12 from the target value of the plate width at the outlet side position (F7 target width) (outlet side plate width deviation). ) Is supplied from the subtractor 6 to control the three tension adjusters TC related to the rolling stands F4, F5, F6 in the subsequent stage located downstream of the intermediate position in every constant control cycle, and the width meter 12 The board width at the exit position measured in step S1 should be close to the target width F7.

As will be described later in detail, the former stage target width corrector 74 irrespective of the value of the tension between the rolling stands on the downstream side of the intermediate position (the tension between the rolling stands reaches the upper limit value or the lower limit value). Deviations between the tensions σ4, σ5, σ6 measured by each tension measuring device (or tension estimator) 77, 78, 79 in the subsequent stage and the target value of the tension at each position in the subsequent stage (post tension The deviation amount is supplied from the subtractor 75 to derive the correction amount of the F3 initial target width. The correction amount of the F3 initial target width derived by the preceding stage target width modifier 74 is added to the F3 initial target width in the adder 8. Then, a value (intermediate plate width deviation) obtained by subtracting the plate width at the intermediate position measured by the width meter 11 from the F3 target value corrected by the addition by the adder 8 is supplied to the preceding plate width controller 2. It

In the present embodiment, the front plate width controller 2, the three tension adjusters TC controlled by the front plate width controller 2, the subtractor 7 and the width meter 11 constitute the front plate width control means. Further, the rear plate width controller 3, the three tension adjusters TC controlled by the latter, the subtractor 6, and the width meter 12 constitute a rear plate width control means. Furthermore, three tension measuring devices 77, 78, 79, a subtracter 75, and a preceding target width correction device 74
And the adder 8 constitute the preceding stage target width correction means.

As shown in FIG. 8, the former stage target width corrector 74
Includes a weighting adder 83 and a low-pass filter 84.
And a proportional-plus-integral controller 85. The weighting adder 83 adds the post-stage tension deviation calculated by the subtractor 75 while considering the weighting for each place. The weighting performed by the weighting adder 83 preferably takes into consideration the ratio (influence coefficient) of the plate width fluctuation at the exit position with respect to the tension fluctuation. Thereby, more accurate control is expected.

The low-pass filter 84 removes high-frequency components having a frequency higher than the cut-off frequency from the output side plate width deviation supplied to the preceding target width corrector 74, and only low-frequency components having a frequency lower than the cut-off frequency are removed. To be extracted. By using the low-pass filter 84, high-frequency components are removed from the exit side plate width deviation, so the time required to convey the steel sheet M from the intermediate position to the exit side position (dead time).
Therefore, the control system can be prevented from becoming unstable.

The proportional-plus-integral controller 85 calculates the proportional-plus-integral control amount based on the low-frequency component of the output side plate width deviation output from the low-pass filter 84, and corrects the calculated proportional-plus-integral control amount to the F3 initial target width. Output as a quantity. By using the proportional-plus-integral controller 85, it is possible to perform plate width control with high accuracy and without control deviation.

[0057]

[Equation 2]

The above formula (2) is a formula representing the calculation in the subtractor 75, the preceding target width corrector 74 and the adder 8. In equation (2), ∂W7 / ∂σi is the ratio of the strip width variation at the exit position to the tension variation between the i-th (i is an integer from 4 to 6) rolling stand and the i + 1-th rolling stand. , Gi is an adjustment coefficient, σiaim is a target tension value between the i-th rolling stand and the (i + 1) th rolling stand, and σiaim is a tension between the i-th rolling stand and the (i + 1) th rolling stand. Each means.

As shown by the broken line in FIG.
The front-stage target width corrector 74 may output the supplied outlet side plate width deviation as it is, output it after passing only the weighter 83, or output it after passing only the low-pass filter 84. Or output after passing through the weighter 83 and the low-pass filter 84,
It may be output after passing only the proportional-plus-integral controller 85.

FIG. 9 shows a hot continuous rolling apparatus 20 shown in FIG.
When the plate width of the steel plate M rolled by the plate width control device 71 is controlled by the plate width controller 71, the plate width (F
It is a graph which shows the simulation result of board width (F7 width) in the exit side position. Further, FIG. 10 is a graph showing a state of tension change in the subsequent rolling stand at that time.

In FIG. 9, the curve 91 is the F3 target width, the curve 92 is the F7 target width, the curve 93 is the F3 width, and the curve 94 is F.
Each of the seven widths is shown over time. Further, in FIG. 10, a curve 101 shows the time change of the tension between the post-rolling stands.

By comparing the curve 94 of FIG. 9, the curve 35 of FIG. 3 and the curve 54 of FIG. 5, it can be seen that the steel plate M can be reliably set to the target width in the present embodiment. As described above, according to the present embodiment, an uncontrolled region hardly occurs in the steel plate M, and a steel plate having a good plate width can be obtained over the entire plate length.

Comparing the curve 101 in FIG. 10, the curve 41 in FIG. 4, and the curve 61 in FIG. 6 shows that not only the tension is not saturated but also the tension can be almost set in this embodiment. . That is, when the strip width control device 71 of the present embodiment is used, the deviation between the rolling stand tension at the subsequent stage and its target value is irrespective of the value of the tension between rolling stands on the downstream side of the intermediate position. Since the target value of the plate width given to the preceding plate width controller 2 is corrected based on this, appropriate control can be performed in the vicinity of the set tension, and the amplitude of the plate width fluctuation at the exit side position is reduced. be able to.
Moreover, since it is not necessary to reduce the width of the upper and lower limit values of the tension in the latter stage, the plate width correction ability in the latter stage does not decrease.

Further, by comparing FIG. 9, FIG. 5, and FIG. 3, it is understood that according to the present embodiment, the plate width at the exit side position can be quickly brought close to the F7 target width. . This is because the high-frequency component of the output side plate width deviation is removed by the low-pass filter 84, so that more stable plate width control can be performed while ignoring high-frequency components such as noise. Furthermore, it is understood from these drawings that according to the present embodiment, the plate width at the exit side position can be accurately brought close to the F7 target width. This is because the proportional-plus-integral control amount calculated by the proportional-plus-integral controller 85 is used as the correction amount of the F3 target value.

Next, a third embodiment of the present invention will be described. FIG. 11: is a schematic diagram of the strip width control apparatus with which the strip width control method by the 3rd Embodiment of this invention is implemented, and the hot continuous rolling mill controlled by this. A steel plate M, which is a material to be rolled whose plate width is controlled by the plate width control device 111, is conveyed from the left to the right in the drawing, and has a rolling stand row including seven rolling stands F1 to F7. Rolled by 20. Rolling stand F1
Each of F7 to F7 is driven by a motor (not shown). Each of the six rolling stands F1 to F6 except the final rolling stand F7 is provided with a tension adjuster TC including a looper for adjusting the tension applied to the steel sheet M between each rolling stand and its adjacent rolling stands. Has been done. Between the rolling stand F3 and the rolling stand F4 (intermediate position) and on the exit side (exit position) of the rolling stand F7, width measuring devices (width gauges) 11 and 12 for measuring the width of the steel sheet M are provided. Are arranged. Further, between the rolling stand F4 and the rolling stand F5, between the rolling stand F5 and the rolling stand F6, and between the rolling stand F6 and the rolling stand F7, the tension (σ4, σ5, σ) of the steel sheet M is provided.
Tension measuring devices (or tension estimators) 77, 78, 79 for measuring or estimating 6) are arranged, respectively.

The width control device 111 includes two width gauges 1
1, 12 and 3 tension measuring devices (or tension estimators)
In addition to 77, 78, 79, the front plate width controller 2, the rear plate width controller 3, the front target width modifier 114, the three subtractors 6, 7, 115 and one adder 8 are provided. include. The front plate width controller 2 subtracts the value (intermediate plate width deviation) obtained by subtracting the plate width at the intermediate position measured by the width meter 11 from the target value of the plate width at the intermediate position (F3 target width). Is supplied from the intermediate position, the three tension adjusters TC of the upstream rolling stands F1, F2, F3 located upstream of the intermediate position are controlled at a constant control cycle, and the intermediate width measured by the width gauge 11 is measured. The plate width at the position should be close to the F3 target width.

The post-stage strip width controller 3 subtracts the strip width at the strip side position measured by the width meter 12 from the strip width target value at the strip side position (F7 target width) (strip side strip width deviation). ) Is supplied from the subtractor 6 to control the three tension adjusters TC related to the rolling stands F4, F5, F6 in the subsequent stage located downstream of the intermediate position in every constant control cycle, and the width meter 12 The board width at the exit position measured in step S1 should be close to the target width F7.

As will be described later in detail, the former stage target width corrector 114 is configured so that the tension between rolling stands reaches the upper limit value or the lower limit value regardless of the value of the tension between rolling stands on the downstream side of the intermediate position. Deviations between the tensions σ4, σ5, σ6 measured by each tension measuring device (or tension estimator) 77, 78, 79 in the subsequent stage and the target value of the tension at each position in the subsequent stage (post tension Deviation) is supplied from the subtractor 115 and the output side plate width deviation is supplied from the subtractor 6,
The correction amount of the F3 initial target width is derived. The correction amount of the F3 initial target width derived by the former target width corrector 114 is
It is added to the F3 initial target width in the adder 8. Then, a value (intermediate plate width deviation) obtained by subtracting the plate width at the intermediate position measured by the width meter 11 from the F3 target value corrected by the addition by the adder 8 is supplied to the preceding plate width controller 2. It

In the present embodiment, the front plate width controller 2, the three tension adjusters TC controlled by the front plate width controller 2, the subtractor 7 and the width meter 11 constitute the front plate width control means. Further, the rear plate width controller 3, the three tension adjusters TC controlled by the latter, the subtractor 6, and the width meter 12 constitute a rear plate width control means. Furthermore, three tension measuring devices (or tension estimators) 77, 78, 79 and a subtractor 11
5, the pre-stage target width correction unit 114 and the adder 8 constitute a pre-stage target width correction unit.

The front-end target width corrector 114 includes a weighting adder, a low-pass filter, and a proportional-plus-integral controller, as in the front-end target width corrector 74 according to the second embodiment described with reference to FIG. include. The weighting adder adds the post-stage tension deviation calculated by the subtractor 115 in consideration of the weighting for each place, and further adds it to the exit side plate width deviation supplied from the subtractor 6. The weighting performed by the weighting adder preferably takes into consideration the ratio (influence coefficient) of the plate width variation to the tension variation. Thereby, more accurate control is expected.

The low-pass filter removes high-frequency components from the output-side plate width deviation supplied to the preceding target width corrector 114 and extracts only low-frequency components. By using the low-pass filter, the high-frequency component is removed from the exit side plate width deviation, so that the control system becomes unstable due to the time (dead time) required to convey the steel sheet M from the intermediate position to the exit side position. Can be suppressed.

The proportional-plus-integral controller calculates the proportional-plus-integral control amount based on the low-frequency component of the output side plate width deviation output from the low-pass filter, and uses the calculated proportional-plus-integral control amount as the correction amount of the F3 initial target width. Output. By using the proportional-plus-integral controller, it is possible to perform plate width control with high accuracy and without control deviation.

[0073]

[Equation 3]

The above expression (3) is an expression representing the calculation in the subtractor 115, the preceding target width modifier 114 and the adder 8.

In this embodiment, the preceding target width corrector 114 has a one-shot control function in addition to the control function based on the above equation (3). In the one-shot control function, the F3 target width is corrected by one shot based on the output side plate width deviation or its low frequency component. This one-shot correction is usually performed before the control based on the equation (3) is executed. By performing the one-shot correction in this way, the plate width at the exit side position can be quickly brought close to the target value.

FIG. 12 shows that the width of the steel sheet M rolled by the hot continuous rolling apparatus 20 shown in FIG.
12 is a graph showing simulation results of the plate width (F3 width) at the intermediate position and the plate width (F7 width) at the exit position when controlled by 11. In addition, FIG.
It is a graph which drew the appearance of the tension change in the latter stage rolling stand at that time.

In FIG. 12, the curve 121 is the F3 target width, the curve 122 is the F7 target width, the curve 1123 is the F3 width,
Curves 124 show the changes over time in the F7 width.
In addition, in FIG. 13, a curve 131 shows the time change of the tension between the post-rolling stands.

In the example of FIG. 12, the F3 target value is corrected by one shot. The correction amount of the F3 target value when performing the one-shot correction is determined by the front stage target width correction unit 114 based on the output side plate width deviation or the low frequency component thereof.

When the curve 124 of FIG. 12, the curve 35 of FIG. 3 and the curve 54 of FIG. 5 are compared, in the present embodiment, the steel plate M
It can be seen that the target width can be reliably achieved.
As described above, according to the present embodiment, an uncontrolled region hardly occurs in the steel plate M, and a steel plate having a better plate width over the entire plate length can be obtained, and

By comparing the curve 131 of FIG. 13, the curve 41 of FIG. 4 and the curve 61 of FIG. 6, it can be seen that in the present embodiment, not only the tension is not saturated, but also the tension can be almost set. . That is, when the strip width control device 111 of the present embodiment is used, the deviation between the tension between rolling stands in the subsequent stage and its target value is irrespective of the value of the tension between rolling stands on the downstream side of the intermediate position. Since the target value of the plate width given to the preceding plate width controller 2 is corrected based on this, appropriate control can be performed in the vicinity of the set tension, and the amplitude of the plate width fluctuation at the exit side position is reduced. be able to. Moreover, since it is not necessary to reduce the width of the upper and lower limit values of the tension in the latter stage, the plate width correction ability in the latter stage does not decrease.

Further, by comparing FIG. 12, FIG. 5 and FIG. 3, it can be seen that according to the present embodiment, the plate width at the exit side position can be quickly brought close to the F7 target width. . This is because the high-frequency component of the output side plate width deviation is removed by the low-pass filter, so that more stable plate width control can be performed while ignoring the high-frequency component such as noise. Furthermore, it is understood from these drawings that according to the present embodiment, the plate width at the exit side position can be accurately brought close to the F7 target width. This is because the proportional-plus-integral control amount calculated by the proportional-plus-integral controller is used as the correction amount of the F3 target value.

Further, in the example shown in FIG. 12, the plate width approaches the target value more quickly by correcting the F3 target value by one shot.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-mentioned embodiments, and various design changes are possible within the scope of the claims. Is. For example, in the above-described embodiment, the intermediate position is between the rolling stand F3 and the rolling stand F4, but the intermediate position may be another place. Further, the number of rolling stands is not limited to seven, and can be any number.

Further, it is not always necessary to use a low-pass filter or a proportional-plus-integral controller as the former target width corrector. Instead of the low-pass filter, a sampling circuit with a longer sampling period may be used in the former target width modifier. In addition, in the first embodiment, one-shot correction may be performed. On the contrary, in the third embodiment, the one-shot correction does not necessarily have to be performed. Furthermore, it is not necessary to perform only one-shot correction and then correct the preceding target width.

[0085]

As described above, according to claims 1 and 12, an uncontrolled region hardly occurs in the rolled material, and a rolled material having a good strip width over substantially the entire length of the strip can be obtained. You can

According to the fifth and the sixth aspects, the uncontrolled region hardly occurs in the rolled material, the rolled material having a good strip width can be obtained over the entire length of the strip, and the rolled strip width control means sets it. Since the appropriate control can be performed in the vicinity of the tension, it is possible to reduce the amplitude of the strip width variation at the final rolling stand exit side position. Moreover, since it is not necessary to reduce the width of the upper and lower limit values of the tension in the latter stage, the plate width correction ability in the latter stage does not decrease.

According to the eighth and the nineteenth aspects, an uncontrolled region hardly occurs in the material to be rolled, a rolled material having a better strip width can be obtained over the entire length of the strip, and the post strip width control means can be used. Since appropriate control can be performed in the vicinity of the set tension, the amplitude of the strip width variation at the final rolling stand exit side position can be reduced, and the strip width correction capability at the subsequent stage can be prevented from lowering.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a strip width control device for executing a strip width control method according to a first embodiment of the present invention and a hot continuous rolling mill controlled by the strip width control device.

FIG. 2 is a block diagram showing an internal structure of a preceding target width corrector included in the plate width control device shown in FIG.

FIG. 3 is a graph showing simulation results of a plate width (F3 width) at an intermediate position and a plate width (F7 width) at an exit position according to the first embodiment of the present invention.

FIG. 4 is a graph illustrating a state of tension change in a post-rolling stand when the same simulation as in FIG. 3 is performed.

FIG. 5 is a graph showing a simulation result of a plate width (F3 width) at an intermediate position and a plate width (F7 width) at an exit position according to a conventional technique.

FIG. 6 is a graph illustrating a state of tension change in a post-rolling stand when the same simulation as in FIG. 5 is performed.

FIG. 7 is a schematic diagram of a strip width control device for executing a strip width control method according to a second embodiment of the present invention and a hot continuous rolling mill controlled by the strip width control device.

8 is a block diagram showing an internal structure of a preceding target width corrector included in the plate width control device shown in FIG.

FIG. 9 is a graph showing simulation results of a plate width (F3 width) at an intermediate position and a plate width (F7 width) at an exit position according to the second embodiment of the present invention.

FIG. 10 is a graph showing a state of tension change in a post-rolling stand when the same simulation as in FIG. 9 is performed.

FIG. 11 is a schematic diagram of a strip width control device for implementing a strip width control method according to a third embodiment of the present invention and a hot continuous rolling mill controlled by the strip width control device.

FIG. 12 is a graph showing a simulation result of a plate width (F3 width) at an intermediate position and a plate width (F7 width) at an output side position according to the third embodiment of the present invention.

FIG. 13 is a graph illustrating a state of tension change in a post-rolling stand when the same simulation as in FIG. 12 is performed.

FIG. 14 is a graph showing the relationship between the strip width and the tension of the rolled material.

[Explanation of symbols]

1 Board width control device 2 Front plate width controller 3 Rear plate width controller 4 Pre-stage target width corrector 6,7 Subtractor 8 adder 11, 12 width gauge 14 Low-pass filter 15 Proportional Integral Controller 20 Hot continuous rolling equipment

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kazuhiko Higashi             1 Kanazawa Town, Kakogawa City, Hyogo Prefecture             To Steel Works, Kakogawa Works (72) Inventor Mitsuo Okamoto             1 Kanazawa Town, Kakogawa City, Hyogo Prefecture             To Steel Works, Kakogawa Works (72) Inventor Tomoya Dobashi             1 Kanazawa Town, Kakogawa City, Hyogo Prefecture             To Steel Works, Kakogawa Works F-term (reference) 4E024 AA08 BB03 EE01                 5H004 GA08 GB03 HA06 HA10 HB06                       HB10 JA12 JA23 JB21 KA46                       KA61 KA65 KA69 KB02 KB04                       KC22 LA02 LB05 MA12

Claims (22)

[Claims] 1. The tension between the rolling stands on the upstream side of the intermediate position is adjusted so that the strip width of the material to be rolled at the intermediate position of the rolling stand row composed of a plurality of rolling stands approaches a target value. Pre-stage strip width control means for, so that the strip width between the rolling stands on the downstream side of the intermediate position, so that the strip width of the material to be rolled at the final rolling stand exit side position of the rolling stand row approaches the target value And the latter stage plate width control means for adjusting, regardless of the value of the tension between each rolling stand on the downstream side of the intermediate position, the strip width of the material to be rolled at the final rolling stand exit side position and its target A material to be rolled in hot continuous rolling, characterized in that it comprises pre-stage target width correction means for correcting the target value of the strip width given to the pre-stage strip width control means based on the deviation from the value. Board width control device. 2. The front-stage strip width control means is based on a low-frequency component of the deviation between the strip width of the material to be rolled at the final rolling stand exit side position and its target value. The plate width control device for a material to be rolled in hot continuous rolling according to claim 1, wherein a given target value of the plate width is corrected. 3. The preceding stage target width correction means calculates a proportional integral control amount from a deviation between a strip width of the material to be rolled at the exit side position of the final rolling stand and its target value or a low frequency component thereof, The plate width control device for a material to be rolled in hot continuous rolling according to claim 1, wherein a target value of the plate width given to the preceding plate width control means is corrected with the proportional-plus-integral control amount as a correction amount. 4. The pre-stage strip width control means is based on a deviation between a strip width of the material to be rolled at the exit side position of the final rolling stand and its target value or a low frequency component thereof. The plate width control device for a material to be rolled in hot continuous rolling according to any one of claims 1 to 3, wherein the target value of the plate width given to (1) is corrected by one shot. 5. The tension between the rolling stands on the upstream side of the intermediate position is adjusted so that the strip width of the material to be rolled at the intermediate position of the rolling stand row consisting of a plurality of rolling stands approaches a target value. Pre-stage strip width control means for, so that the strip width between the rolling stands on the downstream side of the intermediate position, so that the strip width of the material to be rolled at the final rolling stand exit side position of the rolling stand row approaches the target value And the subsequent plate width control means for adjusting the value of the tension between rolling stands on the downstream side of the intermediate position, regardless of the value of the tension between rolling stands on the downstream side of the intermediate position and its target value. Of the material to be rolled in hot continuous rolling, characterized in that it comprises a pre-stage target width correction means for correcting the target value of the strip width given to the pre-stage strip width control means. Board width control device. 6. The pre-stage target width correction means gives the pre-stage plate width control means based on a low-frequency component of a deviation between the tension between rolling stands on the downstream side of the intermediate position and its target value. The plate width control device for a material to be rolled in hot continuous rolling according to claim 5, wherein a target value of the plate width to be adjusted is corrected. 7. The preceding stage target width correction means calculates a proportional integral control amount from a deviation between tensions between rolling stands downstream of the intermediate position and its target value or a low frequency component thereof, and calculates the proportional The plate width control device for a material to be rolled in hot continuous rolling according to claim 5, wherein a target value of the plate width given to the preceding plate width control means is corrected by using the integral control amount as a correction amount. 8. The tension between the rolling stands on the upstream side of the intermediate position is adjusted so that the strip width of the material to be rolled at the intermediate position of the rolling stand row consisting of a plurality of rolling stands approaches a target value. Pre-stage strip width control means for, so that the strip width between the rolling stands on the downstream side of the intermediate position, so that the strip width of the material to be rolled at the final rolling stand exit side position of the rolling stand row approaches the target value And the latter stage plate width control means for adjusting, regardless of the value of the tension between each rolling stand on the downstream side of the intermediate position, the strip width of the material to be rolled at the final rolling stand exit side position and its target To correct the target value of the strip width given to the preceding strip width control means, based on the deviation from the value and the deviation between the tension between rolling stands on the downstream side of the intermediate position and the target value thereof. Equipped with the preceding target width correction means Sheet width control device for the material to be rolled in the continuous hot rolling, characterized in that there. 9. The low-frequency component of the deviation between the strip width of the material to be rolled and its target value at the final rolling stand exit side position, and the downstream side of the intermediate position. 9. The heat according to claim 8, wherein the target value of the strip width given to the preceding strip width control means is corrected based on the low frequency component of the deviation between each rolling stand tension and the target value thereof. Width control device for rolled material in hot rolling. 10. The deviation of the strip width of the material to be rolled at the exit side position of the final rolling stand and its target value or its low-frequency component, and the downstream side of the intermediate position Of the tension between the rolling stands and the target value and the proportional integral control amount is calculated from the low frequency component thereof, and the target of the strip width given to the preceding strip width control means as the correction amount. The plate width control device for a material to be rolled in hot continuous rolling according to claim 8, wherein the value is corrected. 11. The front-stage target width correction means includes a deviation between a strip width of a material to be rolled and a target value at the final rolling stand exit side position or a low-frequency component thereof, and a downstream side of the intermediate position. 9. The one-shot correction of the target value of the strip width given to the preceding strip width control means based on the deviation between the tension between each rolling stand and its target value or its low frequency component in FIG. 10. A strip width control device for a material to be rolled in hot continuous rolling according to any one of 10 to 10. 12. The tension between the rolling stands on the upstream side of the intermediate position is adjusted so that the strip width of the material to be rolled at the intermediate position of the rolling stand row consisting of a plurality of rolling stands approaches a target value. Pre-stage plate width control means for, and the tension between each rolling stand on the downstream side of the intermediate position so that the plate width of the material to be rolled at the final rolling stand exit side position of the rolling stand row approaches the target value. In the plate width control method of the material to be rolled in hot continuous rolling in which the plate width of the material to be rolled is controlled by the subsequent plate width control means for adjusting, between the rolling stands on the downstream side of the intermediate position. Regardless of the value of the tension, the target value of the plate width given to the preceding plate width control means is corrected based on the deviation between the plate width of the material to be rolled at the final rolling stand exit side position and its target value. Hot ream characterized by Sheet width control method of the material to be rolled in the rolling. 13. The target value of the strip width given to the preceding strip width control means is based on a low frequency component of the deviation between the strip width of the material to be rolled at the final rolling stand exit side position and its target value. The method for controlling the strip width of a material to be rolled in hot continuous rolling according to claim 12, which is modified. 14. A proportional-plus-integral control amount is calculated from the deviation between the strip width of the material to be rolled at the exit side position of the final rolling stand and its target value or its low-frequency component, and the proportional-plus-integral control amount is used as a correction amount. The plate width control method for a material to be rolled in hot continuous rolling according to claim 12, wherein a target value of the plate width given to the preceding plate width control means is corrected. 15. A target value of the plate width given to the preceding plate width control means based on a deviation between the plate width of the material to be rolled at the final rolling stand exit side position and its target value or its low frequency component. The method for controlling the strip width of a material to be rolled in hot continuous rolling according to any one of claims 12 to 14, characterized in that 16. The tension between the rolling stands on the upstream side of the intermediate position is adjusted so that the strip width of the material to be rolled at the intermediate position of the rolling stand row composed of a plurality of rolling stands approaches a target value. Pre-stage plate width control means for, and the tension between each rolling stand on the downstream side of the intermediate position so that the plate width of the material to be rolled at the final rolling stand exit side position of the rolling stand row approaches the target value. In the plate width control method of the material to be rolled in hot continuous rolling in which the plate width of the material to be rolled is controlled by the subsequent plate width control means for adjusting, between the rolling stands on the downstream side of the intermediate position. Regardless of the value of the tension, the target value of the strip width given to the preceding strip width control means is corrected based on the deviation between the tension between rolling stands on the downstream side of the intermediate position and its target value. Characterized by Sheet width control method of the material to be rolled in the continued rolling. 17. The target value of the strip width given to the preceding strip width control means is corrected based on the low frequency component of the deviation between the tension between rolling stands and its target value on the downstream side of the intermediate position. The method for controlling the strip width of a material to be rolled in hot continuous rolling according to claim 16, wherein 18. A proportional-plus-integral control amount is calculated from a deviation between the tension between rolling stands on the downstream side of the intermediate position and its target value or a low-frequency component thereof, and the proportional-plus-integral control amount is used as a correction amount. The plate width control method for a material to be rolled in hot continuous rolling according to claim 16, wherein a target value of the plate width given to the preceding plate width control means is corrected. 19. The tension between the rolling stands on the upstream side of the intermediate position is adjusted so that the strip width of the material to be rolled at the intermediate position of the rolling stand row composed of a plurality of rolling stands approaches a target value. Pre-stage plate width control means for, and the tension between each rolling stand on the downstream side of the intermediate position so that the plate width of the material to be rolled at the final rolling stand exit side position of the rolling stand row approaches the target value. In the plate width control method of the material to be rolled in hot continuous rolling in which the plate width of the material to be rolled is controlled by the subsequent plate width control means for adjusting, between the rolling stands on the downstream side of the intermediate position. Regardless of the value of tension, the deviation between the strip width of the material to be rolled at the final rolling stand exit side position and its target value, and the tension between each rolling stand at the downstream side of the intermediate position and its target value Based on the deviation from Sheet width control method of the material to be rolled in the continuous hot rolling, which comprises correcting the target value of plate width to be given to the serial front plate width control means. 20. A low-frequency component of the deviation between the strip width of the material to be rolled at the final rolling stand exit side position and its target value, and the tension between each rolling stand downstream of the intermediate position and its The target value of the strip width given to the preceding stage strip width control means is corrected based on the low frequency component of the deviation from the target value. Board width control method. 21. A deviation between a strip width of a material to be rolled at a position on the delivery side of the final rolling stand and its target value or a low frequency component thereof, and a tension between rolling stands on the downstream side of the intermediate position. A deviation from the target value or a proportional-integral control amount is calculated from the low-frequency component thereof, and the target value of the plate width given to the preceding plate width control means is corrected with the proportional-integral control amount as a correction amount. The strip width control method for a material to be rolled in hot continuous rolling according to claim 19. 22. A deviation between a strip width of a material to be rolled at a position on the delivery side of the final rolling stand and its target value or a low frequency component thereof, and a tension between rolling stands on the downstream side of the intermediate position. 20. The one-shot correction of the target value of the plate width given to the preceding stage plate width control means is performed based on the deviation from the target value or the low frequency component thereof.
22. A strip width control method for a material to be rolled in hot continuous rolling according to claim 21.