JP2000326005A - Method for controlling width in hot rolling mill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control method for making improvement in accuracy of width in a hot tandem rolling line. SOLUTION: This method is the control method of width in the hot tandem rolling mill and provided with a tension detecting step S11 for detecting the tension between upstream stands and feedforward dynamic correction steps S12, S13, where on the basis of the output from the tension detecting step 11, a value to be corrected is calculated, and on the basis of the value to be corrected, the tension in a downstream device is dynamically corrected by a feedforward system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strip width control method for improving strip width and thickness accuracy of a strip in a hot tandem rolling line.

[0002]

2. Description of the Related Art Conventionally, in a hot finishing mill, various strip width control methods have been developed and adopted in order to realize a highly accurate strip width. By the hot finish rolling mill, before the strip reaches the rolling mill, the set-up values of the rolling position, roll speed, etc. of each stand finishing rolling mill are calculated in advance by the finish set-up control, and the strip is set in advance before setting the strip. Engage the stand sequentially.

When the strip is engaged in each stand, the set value is a predicted calculation value, and therefore, there is a possibility that an error may occur from the actual result when the strip is engaged. Is unstable, and a fluctuation in tension causes a fluctuation in plate width.

[0004] Regarding the width control of the strip,
For example, as shown in Japanese Patent Application Laid-Open No. 9-122722, the width drop amount of the leading end and the tail end of the material to be rolled, which is generated at the time of rough rolling, is equal to the width reduction amount of the steady finish rolling portion. The sheet width is controlled so as to set the target steady part sheet width on the rough rolling mill exit side, the target steady part sheet width on the finishing rolling mill exit side, and the stand-to-stand tension of the finishing mill.

Further, as disclosed in Japanese Patent Publication No. 63-80909, a width gauge is arranged before and after a predetermined rolling stand of a tandem rolling system, and a tension change of a rolled material in front of and behind the rolling stand. By detecting the width change of the rolled material on the entrance and exit sides of the rolling stand by the width meter, to derive a correlation between the front and rear tension changes and the width change, based on the subsequent correlation based on the correlation. By controlling the width of the subsequent rolled material by changing the tension applied to the rolled material, a more accurate width control is performed.

[0006]

As described above, the conventional sheet width control is merely a means for improving the width accuracy of the succeeding material, and is not controlled by any means for the currently rolled material. The rolling material currently being rolled is rolled with low precision because it is not yet rolled, and in this method, until the rolling is performed stably, the width accuracy of the rolled material is considerably poor and is produced It will be.

[0007] Further, since an uncontrolled state occurs between stands at the foremost portion of the strip in the hot tandem rolling line, a change in the sheet width due to a change in tension immediately after the leading end portion is caught in the rolling mill is taken into consideration. Therefore, securing the width accuracy of the leading edge was an issue.

[0008] The cause of the fluctuation in tension that occurs when the leading end portion of the strip bites is considered as follows.

An error occurs in the advance rate calculated by the setup predictive control for the hot finishing mill,
An error occurs in the roll speed balance between stands.

[0010] The conventional tension control method using the looper between stands is performed after the looper has risen, so that tension control before the looper rises immediately after the leading end portion is bitten cannot be performed.

[0011] The present invention is embodied in order to solve the above-described problems, and has as its object to provide a control method capable of improving the sheet width accuracy in a hot tandem rolling line.

[0012]

According to the present invention, there is provided a strip width control method for a hot rolling mill, comprising: a tension detecting step for detecting a tension between upstream stands; And a feed-forward dynamic correction step of calculating a correction value based on the output of the tension detection step and dynamically correcting the tension in a downstream device in a feed-forward manner based on the correction value.

The downstream device is a looper control device, and the feedforward dynamic correction step includes:
Based on the correction value, the looper controller corrects the tension.

The downstream device is a roll speed control device, and the feedforward dynamic correction step causes the roll speed control device to correct the tension based on the correction value.

In the tension detecting step, the tension between at least two upstream stands is detected, the downstream device is a looper control device, and the feedforward dynamic correction step is a correction value based on the tension between the two stands. Is calculated, and the looper controller corrects the tension based on the correction value.

The tension detecting step detects a tension between at least two upstream stands, the downstream device is a roll speed control device, and the feedforward dynamic correcting step corrects the tension based on the tension between the two stands. The value is calculated, and the roll speed control device corrects the tension based on the correction value.

According to another aspect of the present invention, there is provided a strip width control method for a hot tandem rolling mill, comprising: a tension detecting step for detecting a tension between downstream stands; Calculate the correction value based on the output of the detection step,
And a feedback dynamic correction step of causing the upstream device to dynamically correct the tension in a feedback manner based on the correction value.

The upstream device is a looper control device, and the feedback dynamic correction step causes the looper control device to correct the tension based on the correction value.

The upstream device is a roll speed control device, and the feedback dynamic correction step includes:
The tension is corrected by the roll speed control device based on the correction value.

In the tension detecting step, the tension between at least two upstream stands is detected, the upstream device is a looper control device, and the feedback dynamic correction step calculates a correction value based on the tension between the two stands. Calculate,
Based on the correction value, the looper controller corrects the tension.

The tension detecting step detects a tension between at least two upstream stands, the upstream device is a roll speed control device, and the feedback dynamic correcting step includes a correction value based on the tension between the two stands. Is calculated, and the roll speed control device corrects the tension based on the correction value.

According to another aspect of the present invention, there is provided a strip width controlling method for a hot tandem rolling mill, comprising: a strip width detecting step of detecting a strip width between upstream stands. , Calculate the correction value based on the output of the width detection step,
A feed-forward dynamic correction step of dynamically correcting tension in a feed-forward manner in a downstream device based on the correction value.

Also, the downstream device is a looper control device, and the feedforward dynamic correction step includes:
Based on the correction value, the looper controller corrects the tension.

The downstream device is a roll speed control device, and the feedforward dynamic correction step causes the roll speed control device to correct the tension based on the correction value.

Further, a strip width control method for a hot rolling mill according to another invention is a strip width control method for a hot tandem rolling mill, wherein the strip width for detecting the strip width and the strip thickness between the upstream stands is provided. A sheet thickness detection step, a feedforward dynamic correction step of calculating a correction value based on the output of the sheet width / plate thickness detection step, and dynamically correcting the tension in a downstream device in a feedforward manner based on the correction value. It has.

The sheet width / thickness detecting step detects the sheet width / thickness between at least two upstream stands, the downstream device is a looper control device, and the feed forward dynamic correction step comprises two stand positions. A correction value is calculated on the basis of the sheet width and the sheet thickness therebetween, and the looper controller corrects the tension based on the correction value.

The sheet width / sheet thickness detecting step detects a sheet width / sheet thickness between at least two upstream stands, the downstream device is a roll speed control device, and the feed forward dynamic correction step is Board width between stands
A correction value is calculated based on the sheet thickness, and the roll speed control device corrects the tension based on the correction value.

According to another aspect of the present invention, there is provided a strip width control method for a hot tandem rolling mill, comprising: a strip width detecting step for detecting a strip width between upstream stands. , Calculate the correction value based on the output of the width detection step,
And a feedback dynamic correction step of causing the upstream device to dynamically correct the tension in a feedback manner based on the correction value.

The upstream device is a looper control device, and the feedback dynamic correction step causes the looper control device to correct the tension based on the correction value.

The upstream device is a roll speed control device, and the feedback dynamic correction step includes:
The tension is corrected by the roll speed control device based on the correction value.

A strip width control method for a hot rolling mill according to another invention is a strip width control method for a hot tandem rolling mill, wherein a strip width for detecting a strip width and a strip thickness between upstream stands is provided. A thickness correction step, and a feedback dynamic correction step of calculating a correction value based on the output of the width / thickness detection step and dynamically correcting the tension in an upstream device based on the correction value in a feedback manner. ing.

The sheet width / thickness detecting step detects the sheet width / thickness between at least two upstream stands, the upstream device is a looper control device, and the feedback dynamic correction step is a step between the two stands. A correction value is calculated based on the sheet width and the sheet thickness, and the tension is corrected by the looper controller based on the correction values.

The sheet width / thickness detecting step detects the sheet width / thickness between at least two upstream stands. The upstream apparatus is a roll speed control apparatus. A correction value is calculated based on the sheet width and the sheet thickness therebetween, and the tension is corrected by the roll speed control device based on the correction value.

[0034] Further, a strip width control method for a hot rolling mill according to another invention is a strip width control method for a hot tandem rolling mill, wherein a tension detecting step of detecting a tension between stands,
A correction value is calculated based on the output of the tension detection step, and a feedback dynamic correction step in which the upstream device dynamically corrects the tension in a feedback manner based on the correction value, and a correction value is calculated based on the output of the tension detection step. And a feedforward dynamic correction step of dynamically correcting the tension in a feedforward manner in a downstream device based on the correction value.

The upstream device is a first looper control device, and the feedback dynamic correction step causes the first looper control device to correct the tension based on the correction value, and the downstream device sets the second looper control device to the second looper control device. The feed forward dynamic correction step causes the second looper control device to correct the tension based on the correction value.

The upstream device is a roll speed control device, and the feedback dynamic correction step includes:
Based on the correction value, let the roll speed controller correct the tension,
The downstream device is a looper control device, and the feedforward dynamic correction step causes the looper control device to correct the tension based on the correction value.

The upstream device is a looper control device, the feedback dynamic correction step causes the looper control device to correct the tension based on the correction value, and the downstream device is a roll speed control device, The forward dynamic correction step causes the roll speed controller to correct the tension based on the correction value.

Also, the upstream device is a first roll speed control device, and the feedback dynamic correction step causes the first roll speed control device to correct the tension based on the correction value, and the downstream device performs The second roll speed control device, wherein the feedforward dynamic correction step causes the second roll speed control device to correct the tension based on the correction value.

Further, a strip width control method for a hot rolling mill according to another invention is a strip width control method for a hot tandem rolling mill, wherein a strip width detecting step of detecting a strip width between stands,
A correction value is calculated based on the output of the sheet width detection step, and a feedback dynamic correction step in which an upstream device dynamically corrects the tension in a feedback manner based on the correction value, and a correction value based on the output of the sheet width detection step. And a feed-forward dynamic correction step of dynamically correcting the tension in a downstream device in a feed-forward manner based on the correction value.

The upstream device is a first looper control device, and the feedback dynamic correction step causes the first looper control device to correct the tension based on the correction value, and the downstream device sets the second looper control device to the second looper control device. The feed forward dynamic correction step causes the second looper control device to correct the tension based on the correction value.

The upstream device is a roll speed control device, and the feedback dynamic correction step includes:
Based on the correction value, let the roll speed controller correct the tension,
The downstream device is a looper control device, and the feedforward dynamic correction step causes the looper control device to correct the tension based on the correction value.

The upstream device is a looper control device, and the feedback dynamic correction step causes the looper control device to correct the tension based on the correction value. The downstream device is a roll speed control device. The forward dynamic correction step causes the roll speed controller to correct the tension based on the correction value.

Also, the upstream device is a first roll speed control device, and the feedback dynamic correction step causes the first roll speed control device to correct the tension based on the correction value, and the downstream device performs: The second roll speed control device, wherein the feedforward dynamic correction step causes the second roll speed control device to correct the tension based on the correction value.

Further, a setup control function having an advanced rate learning function using a stand-up looper rise result at the time of strip biting at each rolling stand is further provided.

Further, when the stand is engaged with the strip, a speed correction amount relating to the speed balance between the stand and the next stand is calculated from a plate speed error measured by a plate speed meter installed on the exit side of the stand. A control function for dynamically correcting only the roll speed is further provided.

Further, a function for dynamically controlling the tension until the looper between stands rises when the strip of the next stand is engaged with the strip is further provided.

Also, the tension until the looper between stands rises dynamically when the strip of the next stand bites is dynamically controlled, and after the looper between stands rises, a learning function using the actual tension detected by the looper between stands is maintained. I do.

Further, when the strip is engaged with the strip, a speed correction amount in consideration of the speed ratio with the upstream stand is calculated from a plate speed error measured by a plate speed meter installed on the exit side of the stand, and the upstream stand is calculated. A control function for dynamically correcting all roll speeds is further provided.

[0049]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a control block diagram showing a strip width control method for a hot rolling mill according to an embodiment of the present invention. In the hot tandem rolling line, a deviation between the set value and the tension between the upstream stands causes a width deviation. In order to correct this plate width deviation, in FIG. 1, a corrected value of the tension between the stands in at least one stand at the downstream is obtained from the data regarding the following equation which is set in the computer in advance by the tension controller. The looper control device 2 dynamically controls the feedforward system so as to obtain a value based on the calculated value.

First, the tension between stands is detected from the tensiometer 1 (step S11). The following equation shows that the product sheet width at the final exit side of the rolling mill is calculated from the target by the tension deviation Δσf from the set tension generated at the upstream stand and the tension deviation Δσb from the set tension between at least one downstream stand. The deviation of the sheet width ΔW is shown. (Step S12)

[0051]

(Equation 1)

In order to eliminate the deviation of the sheet width due to Δσf, the target sheet width can be secured by changing the set tension by Δσb ^* from the set tension according to the following equation.

[0053]

(Equation 2)

Where ΔW: plate width variation due to tension dW / dσf: plate width variation coefficient due to tension between the stands Δσf: tension variation from set tension between the stands dW / dσb: tension between certain stands downstream Δσb: Tension variation from set tension between certain stands downstream Δσb ^* : Tension deviation target value from set tension between certain stands downstream

Therefore, based on Δσf collected at a fixed cycle or a fixed length cycle at the upstream, when this point reaches between the target stands to be controlled, at least one of the stands at one downstream stand is set so as to have Δσb ^*. Is dynamically controlled by a looper controller between the stands in a feed-forward manner (step S13).

According to the present invention, in a hot tandem rolling line, a sheet width deviation caused by a deviation between a set value and a tension between upstream stands is reduced by at least a tension between one stand or more downstream in a looper device. Thus, the target width can be secured dynamically by the feedforward method to improve the width accuracy of the rolled material from the front end to the tail end.

Embodiment 2 FIG. 2 is a control block diagram showing a strip width control method for a hot rolling mill according to another embodiment of the present invention. In the hot tandem rolling line, a deviation between the set value and the tension between the upstream stands causes a width deviation. In order to correct this plate width deviation, in FIG. 2, a corrected value of the tension between the stands in at least one stand at the downstream is obtained from the data relating to the following equation which is set in the computer in advance by the tension controller. The roll speed is dynamically controlled by a roll speed controller so as to be a value based on the calculated value.

First, the tension between stands is detected from the tensiometer 1 (step S21). The following equation shows that the product sheet width at the final exit side of the rolling mill is calculated from the target by the tension deviation Δσf from the set tension generated at the upstream stand and the tension deviation Δσb from the set tension between at least one downstream stand. The deviation of the sheet width ΔW is shown (step S22).

[0059]

(Equation 3)

The target plate width can be secured by changing the tension from the set tension by Δσb ^{* according} to the following equation in order to eliminate the plate width deviation due to Δσf.

[0061]

(Equation 4)

Therefore, based on Δσf collected at a fixed period or a fixed length period at the upstream, when this point reaches between the target stands to be controlled, at least one of the stands at the downstream stand is set so as to have Δσb ^*. Is dynamically controlled in a feed-forward manner by the roll speed control device 3 of the stand (step S23).

In the first embodiment, the control is performed using a looper. In this method, the control amount is limited, and the control may not be possible if the tension fluctuation increases.

However, according to the present invention, in the hot tandem rolling line, the sheet width deviation caused by the deviation between the set value and the tension between the upstream stands is reduced by at least the roll speed of one stand or more downstream. The feed-forward method is used to dynamically control the system, so even if the tension fluctuation is large, it will not be impossible to control, and the target plate width will be secured to ensure the accuracy of the plate width from the leading end to the tail end of the material to be rolled. Can be improved.

Embodiment 3 FIG. 3 is a control block diagram showing a sheet width control method for a hot rolling mill according to another embodiment of the present invention. In the hot tandem rolling line, the tension between the upstream stands deviates from the set value,
A thickness deviation occurs. In order to correct the sheet width / sheet thickness deviation, in FIG. 3, at least the correction value of the tension between the stands in the two stands on the downstream side is calculated based on the following data set in the computer by the tension control device in advance. The looper controller 2 dynamically determines the value based on the calculated value and the calculated value by a feedforward method.

First, the tension between stands is detected from the tensiometer 1 (step S31). The following equation is based on the tension deviation Δσf from the set tension generated at the upstream stand and the tension deviations Δσb1 and Δσb2 from the set tension at least between the two downstream stands. The sheet thickness indicates a sheet width deviation ΔW and a sheet thickness deviation Δh that deviate from the target (step S32).

[0067]

(Equation 5)

In order to eliminate the sheet width deviation and the sheet thickness deviation due to Δσf, the target sheet width and the target sheet thickness can be simultaneously secured by changing the set tension by Δσb1 ^* and Δσb2 ^{* according} to the following equation.

[0069]

(Equation 6)

Here, ΔW: plate width variation due to tension Δh: plate thickness variation due to tension dW / dσf: plate width variation coefficient due to tension between the stands Δσf: tension variation from set tension between the stands dW / dσb1: Strip width variation coefficient due to tension between certain stands downstream dW / dσb2: Strip width variation coefficient due to tension between certain stands downstream dh / dσb1: Strip thickness variation coefficient due to tension between certain stands downstream dh / dσb2: Downstream Thickness variation coefficient due to tension between certain stands Δσb1: Tension variation from set tension between certain stands downstream Δσb2: Tension variation from set tension between certain stands downstream Δσb1 ^* : From set tension between certain stands downstream Tension deviation target value Δσb2 ^* : Target value of tension deviation from set tension between stands

Accordingly, based on Δσf collected at a fixed period or a fixed period at the upstream, when this point reaches between the target stands to be controlled, Δσb1 ^* , Δσb1
The tension between at least the two stands in the downstream stands is dynamically controlled by the looper control device 2 between the stands in a feed-forward manner so as to be b2 ^* (steps S33 and S34).

In the first and second embodiments, the control is performed to eliminate only the width deviation caused by the tension fluctuation generated in the upstream stand. However, according to the present invention, in the hot tandem rolling line,
The width deviation and thickness deviation caused by the deviation between the set value and the tension between the upstream stands are dynamically controlled by the looper device at least in the downstream between the two stands by the feeder system by the feeder system. At the same time, the target plate width and the target plate thickness can be secured, and both the plate width and the plate thickness accuracy from the leading end to the tail end of the material to be rolled can be improved.

Embodiment 4 FIG. 4 is a control block diagram showing a sheet width control method for a hot rolling mill according to another embodiment of the present invention. In the hot tandem rolling line, the tension between the upstream stands deviates from the set value,
A thickness deviation occurs. In order to correct the sheet width / thickness deviation, in FIG. 4, at least a correction value of the tension between the stands in the two stands at the downstream is determined by the data relating to the following equation which is set in the computer in advance by the tension control device. The roll speed is controlled by the roll speed controller 3 in a feed-forward manner so as to obtain a value based on the calculated value.

First, the tension between stands is detected from the tensiometer 1 (step S41). The following equation is based on the tension deviation Δσf from the set tension generated at the upstream stand and the tension deviations Δσb1 and Δσb2 from the set tension at least between the two downstream stands. The sheet thickness indicates a sheet width deviation ΔW and a sheet thickness deviation Δh that are out of the target (step S42).

[0075]

(Equation 7)

In order to eliminate the sheet width deviation and the sheet thickness deviation caused by Δσf, the target sheet width and the target sheet thickness can be secured at the same time by changing from the set tension by Δσb1 ^* and Δσb2 ^{* according} to the following equations.

[0077]

(Equation 8)

Therefore, based on Δσf collected at a fixed period or a fixed period at the upstream, when this point reaches between the target stands to be controlled, Δσb1 ^* , Δσb1
At least the tension between the stands in the two downstream stands is dynamically controlled by the roll speed control device 3 between the stands in a feed-forward manner so as to be b2 ^* (steps S43 and S44).

However, in roll speed control, FIG.
As shown in (2), when the following two stands are changed, if the following formula is not satisfied, the tension between the stands increases, and the strip is cut or a loop is generated, which causes trouble in rolling.

For each stand, from the principle of constant mass flow, the relationship between the outlet plate thickness and the outlet plate speed can be expressed by the following equation.

[0081]

(Equation 9)

Here, h _i : thickness of each stand exit side V _i : speed of each stand f _i : each stand advance rate h _L : final stand exit side thickness V _L : last stand speed f _L : last stand advance rate

By keeping this mass flow balance constant, the rolling between the stands is stabilized.

Therefore, the speed correction by Δσb1 ^* is ΔV1,
If the speed correction by σb2 ^* is ΔV2, the final speed set value at the most downstream stand is

[0085]

(Equation 10)

The speed is determined by the speed setting device.

In the first and second embodiments, the control for eliminating only the width deviation due to the tension fluctuation generated in the upstream stand is used. In the third embodiment, the control using the looper is used. In some cases, when the fluctuation of the tension becomes large, the control becomes impossible.

According to the present invention, in the hot tandem rolling line, the sheet width deviation and the sheet thickness deviation caused by the deviation between the set values and the tension between the upstream stands are reduced by at least two stand or more downstream tensions. Is controlled dynamically by the feed-forward method using the roll speed, so that even if the tension variation is large, the control cannot be disabled, and the speed setting device takes into account the effect of the roll speed between the two stands and rolls the strip. Is calculated so that the sheet width does not become unstable, and control is performed by the roll speed control device. Both can be improved.

Embodiment 5 FIG. 5 is a control block diagram showing a sheet width control method for a hot rolling mill according to another embodiment of the present invention. In a hot tandem rolling line, a deviation between a set value and a tension between downstream stands causes a deviation in a sheet width. In order to correct this plate width deviation, in FIG. 5, a corrected value of the tension between the stands in at least one stand at the upstream is obtained from the data regarding the following equation which is set in the computer in advance by the tension controller. The looper control device 2 dynamically controls the feedback system so that the value is based on the calculated value.

First, the tension between stands is detected from the tensiometer 1 (step S51). The following equation shows that the product width on the final exit side of the rolling mill is determined from the target by the tension deviation Δσb from the set tension generated at the downstream stand and the tension deviation Δσf from the set tension between at least one upstream stand. The deviation of the sheet width ΔW is shown (step S52).

[0091]

[Equation 11]

The target plate width can be secured by changing the set tension by Δσf ^* from the set tension according to the following equation in order to eliminate the plate width deviation due to Δσb.

[0093]

(Equation 12)

Here, ΔW: plate width variation due to tension dW / dσf: plate width variation coefficient due to tension between the stands Δσf: tension variation from the set tension between the stands dW / dσb: tension between certain stands downstream Δσb: Tension variation from set tension between certain stands downstream Δσf ^* : Tension deviation target value from set tension between certain stands upstream

The above-mentioned method is the same as the feed forward (calculation of the tension based on the influence coefficient), but is controlled by the following known formula of feedback. This method is
It enables stable and responsive control.

[0096]

(Equation 13)

Here, GI: integral gain GP: proportional gain Therefore, based on Δσb collected at a fixed cycle or a fixed length cycle at the stand, the tension between the stands in at least one stand at the upstream is set so as to be Δσf ^*. Then, the looper control device 2 between the stands dynamically controls in a feedback manner (step S53).

In the first to fourth embodiments, since the control is based on the feedforward method, each coefficient used for obtaining the control amount includes an error, and the accuracy cannot be sufficiently maintained due to the error. There is. According to the present invention, in the hot tandem rolling line, the sheet width deviation caused by the deviation between the set value and the tension between the downstream stands,
Because the tension at least between one stand at the upstream is dynamically controlled by a looper device using a feedback system, the target plate width is secured and the plate width accuracy from the leading end to the tail end of the material to be rolled is further improved. Can be improved.

Embodiment 6 FIG. FIG. 6 is a control block diagram showing a strip width control method for a hot rolling mill according to another embodiment of the present invention. In the hot tandem rolling line, a deviation between the set value and the tension between the downstream stands causes a deviation in the sheet width. In order to correct this plate width deviation, in FIG. 6, a correction value of the tension between the stands in at least one stand at the upstream is obtained from the data relating to the following equation which is set in the computer in advance by the tension controller. The roll speed is dynamically controlled by the roll speed controller 3 in a feedback manner so as to be a value based on the calculated value.

First, the tension between stands is detected from the tensiometer 1 (step S61). The following equation shows that the product width on the final exit side of the rolling mill is determined from the target by the tension deviation Δσb from the set tension generated at the downstream stand and the tension deviation Δσf from the set tension between at least one upstream stand. The deviation of the sheet width ΔW is shown (step S62).

[0101]

[Equation 14]

In order to eliminate the plate width deviation due to Δσb, the target plate width can be secured by changing the set tension by Δσf ^* from the set tension according to the following equation.

[0103]

(Equation 15)

Here, GI: integral gain GP: proportional gain Accordingly, based on Δσb collected at a fixed cycle or a fixed length cycle at the corresponding stand, at least the tension between the stands in one of the stands on the upstream side is set so as to be Δσf ^*. Then, the roll speed control device 3 of the stand dynamically controls in a feedback manner (step S63).

In the first to fourth embodiments, since the control is based on the feedforward method, each coefficient used for obtaining the control amount contains an error, and the accuracy cannot be sufficiently maintained due to the error. There is. In the fifth embodiment, the control is performed using a looper. In this method, the control amount is limited, and the control may not be possible if the tension fluctuation increases.

However, according to the present invention, in the hot tandem rolling line, the sheet width deviation caused by the deviation between the set value and the tension between the downstream stands is reduced by at least the roll speed of one stand or more upstream. Since the dynamic control is performed, the control is not impossible even if the tension fluctuation is large, and the target plate width can be secured and the plate width accuracy from the front end to the tail end of the material to be rolled can be improved.

Embodiment 7 FIG. FIG. 7 is a control block diagram showing a sheet width control method for a hot rolling mill according to another embodiment of the present invention. In the hot tandem rolling line, the tension between the downstream stands deviates from the set value,
A thickness deviation occurs. In order to correct this sheet width / sheet thickness deviation, in FIG. 7, at least the correction value of the tension between the stands in the two stands at the upstream is determined by the data relating to the following equation set in the computer by the tension controller in advance. The looper control device 2 dynamically determines the value based on the calculated value by a feedback method.

First, the tension between stands is detected from the tensiometer 1 (step S71). The following equation shows a width deviation ΔW and a thickness deviation Δh in which the product width and the product thickness at the final exit side of the rolling mill due to the tension deviation Δσb from the set tension generated at the downstream stand deviate from the target (step). S72).

[0109]

(Equation 16)

At least the tension deviations Δσf1 ^* and Δσf2 ^* from the set tension between the two stands on the upstream side,
It is necessary to correct ΔW and Δh.

[0111]

[Equation 17]

Here, ΔW: sheet width variation due to tension Δh: sheet thickness variation due to tension dW / dσb: sheet width variation coefficient due to tension between the stands dh / dσb: sheet thickness variation coefficient due to tension between the stands Δσb: GwI1: Integral gain for plate width deviation in upstream stand 1 GwI2: Integral gain for plate width deviation in upstream stand 2 GwP1: Proportional gain for plate width deviation in upstream stand 1 GwP2: Upstream stand GhI1: Integral gain for width deviation in upstream stand 1 GhI2: Integral gain for width deviation in upstream stand 2 GhP1: Proportional gain for width deviation in upstream stand 1 GhP2: In upstream stand 2 Proportional gain for sheet width deviation Δσf1 ^* : Some gain upstream Tension deviation target value from set tension between stand 1 Δσf2 ^* : Target tension deviation value from set tension between certain stands 2 upstream

Therefore, based on Δσb collected at a fixed cycle or a fixed length cycle at the stand, σf
The tension between at least two stands on the upstream side is dynamically controlled by the looper control device 2 between the stands in a feedback manner so that 1 ^* and Δσf2 ^* are obtained (steps S73 and S74).

In the first to fourth embodiments, since the control is based on the feedforward method, each coefficient used for obtaining the control amount contains an error, and the accuracy cannot be sufficiently maintained due to the error. There is. Further, in the fifth and sixth embodiments, the control is performed to eliminate only the width deviation due to the tension fluctuation generated in the downstream stand.

According to the present invention, in the hot tandem rolling line, the sheet width deviation and the sheet thickness deviation caused by the deviation between the set value and the tension between the downstream stands are reduced by at least the distance between the upstream two stands or more. The tension is dynamically controlled by a looper device in a feedback manner, and at the same time, the target sheet width and the target sheet thickness are secured, so that both the sheet width and the sheet width accuracy from the front end to the tail end of the material to be rolled can be improved.

Embodiment 8 FIG. FIG. 8 is a control block diagram showing a sheet width control method for a hot rolling mill according to another embodiment of the present invention. In the hot tandem rolling line, the tension between the downstream stands deviates from the set value,
A thickness deviation occurs. In order to correct the sheet width / sheet thickness deviation, in FIG. 8, at least the correction value of the tension between the stands in the two stands at the upstream is determined by the data relating to the following equation which is set in the computer in advance by the tension control device. The roll speed is controlled by the roll speed controller 3 in a feedback manner so as to obtain a value based on the calculated value.

First, the tension between stands is detected from the tensiometer 1 (step S81). The following equation shows a width deviation ΔW and a thickness deviation Δh in which the product width and the product thickness at the final exit side of the rolling mill due to the tension deviation Δσb from the set tension generated at the downstream stand deviate from the target (step). S82).

[0118]

(Equation 18)

At least the tension deviations Δσf1 ^* and Δσf2 ^* from the set tension between the two stands on the upstream side,
It is necessary to correct ΔW and Δh.

[0120]

[Equation 19]

Here, ΔW: plate width variation due to tension Δh: plate thickness variation due to tension dW / dσb: plate width variation coefficient due to tension between the stands dh / dσb: plate thickness variation coefficient due to tension between the stands Δσb: GwI1: Integral gain for width deviation in upstream stand 1 GwI2: Integral gain for width deviation in upstream stand 2 GwP1: Proportional gain for width deviation in upstream stand 1 GwP2: Upstream stand GhI1: Integral gain for width deviation in upstream stand 1 GhI2: Integral gain for width deviation in upstream stand 2 GhP1: Proportional gain for width deviation in upstream stand 1 GhP2: In upstream stand 2 Proportional gain Δσf1 ^* for plate width deviation: a certain stand upstream Tension deviation target value from set tension between 1 Δσf2 ^* : target tension deviation from set tension between certain stands 2 upstream

Therefore, based on Δσb collected at a fixed cycle or a fixed length cycle at the stand, Δσf
At least the tension between the stands in the two upstream stands is dynamically controlled by the roll speed control device 3 between the stands in a feedback manner so as to be 1 ^* , Δσf2 ^* (steps S83, S84).

However, in roll speed control, FIG.
As shown in (2), when the following two stands are changed, if the following formula is not satisfied, the tension between the stands increases, and the strip is cut or a loop is generated, which causes trouble in rolling.

For each stand, the relationship between the outlet plate thickness and the outlet plate speed can be expressed by the following equation based on the principle of constant mass flow.

[0125]

(Equation 20)

However, h _i : thickness of each stand exit side V _i : speed of each stand f _i : advance rate of each stand h _L : final stand exit side thickness V _L : speed of the last stand f _L : advance rate of the last stand

By keeping this mass flow balance constant, the rolling between the stands is stabilized.

Therefore, the speed correction by Δσb1 ^* is ΔV1,
If the speed correction by σb2 ^* is ΔV2, the final speed set value at the most downstream stand is

[0129]

(Equation 21)

Is determined by the speed setting device.

In the first to fourth embodiments, since the control is of the feedforward system, each coefficient used for obtaining the control amount contains an error, and the accuracy cannot be sufficiently maintained due to the error. There is. Further, in the fifth and sixth embodiments, the control is performed to eliminate only the width deviation due to the tension fluctuation generated in the downstream stand. In the seventh embodiment, the control is performed using a looper. In this method, the control amount is limited, and the control may not be possible if the tension variation becomes large.

According to the present invention, in the hot tandem rolling line, the sheet width deviation and the sheet thickness deviation due to the deviation between the set value and the tension between the downstream stands are reduced by at least two or more stand tensions upstream. Is controlled dynamically by the feedback method using the roll speed. Therefore, even if the tension fluctuation is large, the control cannot be performed. In addition, the speed setting device takes into account the effect of the roll speed between the two stands to perform strip rolling. The calculation is performed so that it does not become unstable, and control is performed by the roll speed control device.At the same time, the target sheet width and the target sheet thickness are secured, and the sheet width and sheet width accuracy from the leading end to the tail end of the material to be rolled are both determined. Can be improved.

Embodiment 9 FIG. FIG. 9 is a control block diagram showing a sheet width control method for a hot rolling mill according to another embodiment of the present invention. In the hot tandem rolling line, a deviation between the set value and the tension between the upstream stands causes a width deviation. In order to measure and compensate for this width deviation with the intermediate width meter 4 installed between the upstream stands, FIG.
, A correction value of the tension between the stands in at least one stand at the downstream is obtained from data on the following equation which is set in the computer in advance by the tension control device, and the looper control device is set to a value based on the calculated value. 2, the dynamic control is performed by the feed forward method.

First, the board width between stands is detected from the board width meter 4 (step S91). The following equation shows that the product width on the final exit side of the rolling mill deviates from the target by the width deviation ΔWf generated at the upstream stand and the tension deviation Δσb from the set tension between at least one stand downstream. The deviation ΔW is shown (step S92).

[0135]

(Equation 22)

In order to eliminate the plate width deviation due to ΔWf, the target plate width can be secured by changing the set tension by Δσb ^* from the set tension according to the following equation.

[0137]

(Equation 23)

Here, ΔW: Variation of plate width due to tension ΔWf: Actual value of plate width variation measured between upstream stands dW / dσb: Coefficient of variation of plate width due to tension between certain stands downstream Δσb: A certain stand downstream Δ ^* b ^* : target tension deviation from the set tension between certain stands downstream

Therefore, based on Δσb collected at a fixed cycle or a fixed length cycle at this stand, when this point reaches between the target stands to be controlled, Δσb ^*
The tension between the stands in at least one downstream stand is dynamically controlled by the looper control device 2 between the stands in a feed-forward manner (step S93).

In the first to eighth embodiments, the input value for obtaining the control amount is the tension deviation, not the actual actual deviation at the stand, but is calculated by multiplying this tension deviation by each coefficient. . The deviation obtained in this way includes an error, and the error may prevent the accuracy from being sufficiently maintained.

According to the present invention, with respect to rolling by a hot tandem rolling mill, at least the downstream is used to eliminate this deviation by using the actual width deviation measured by an intermediate width meter installed between the upstream stands. By dynamically controlling the tension between one stand and the other in a feedforward manner by a looper control device, it is possible to provide a more accurate sheet width control and improve the sheet width quality of a product.

Embodiment 10 FIG. FIG. 10 is a control block diagram showing a strip width control method for a hot rolling mill according to another embodiment of the present invention. In the hot tandem rolling line, a deviation between the set value and the tension between the upstream stands causes a width deviation. In order to measure and compensate for this plate width deviation with the intermediate plate width meter 4 installed between the upstream stands,
In FIG. 10, a correction value of the tension between the stands in at least one stand at the downstream is obtained from data on the following equation which is set in the computer in advance by the tension control device, and the roll is adjusted to a value based on the calculated value. The speed control device 3 performs dynamic control in a feedforward manner.

First, the board width between stands is detected from the board width meter 4 (step S101). The following equation shows the plate width deviation ΔWf generated at the upstream stand and at least 1
The product width on the final exit side of the rolling mill indicates the width deviation ΔW that deviates from the target by the tension deviation Δσb from the set tension between the stands (step S102).

[0144]

(Equation 24)

In order to eliminate the plate width deviation due to ΔWf, the target plate width can be secured by changing the set tension by Δσb ^* from the set tension according to the following equation.

[0146]

(Equation 25)

Here, ΔW: Variation of plate width due to tension ΔWf: Actual value of plate width variation measured between upstream stands dW / dσb: Coefficient of plate width variation due to tension between certain stands downstream Δσb: Between certain stands downstream Variation from the set tension at the point Δσb ^* : target value of the tension deviation from the set tension between certain stands downstream

Therefore, based on ΔWf collected at a fixed cycle or a fixed length cycle at this stand, when this point reaches between the target stands to be controlled, Δσb ^*
Is controlled dynamically by the roll speed control device 3 between the stands in at least one downstream stand (step S10).
3).

In the first to eighth embodiments, the input value for obtaining the control amount is the tension deviation, and is not the actual actual width deviation of the stand, but is calculated by multiplying this tension deviation by each coefficient. ing. The deviation obtained in this way includes an error, and the error may prevent the accuracy from being sufficiently maintained. Also, the ninth embodiment is a control using a looper, and in this method, the control amount is limited,
If the fluctuation of the tension becomes large, the control may become impossible.

According to the present invention, with respect to the rolling by the hot tandem rolling mill, at least the downstream side is used in order to eliminate this deviation by using the actual width deviation measured by the intermediate width meter installed between the upstream stands. By dynamically controlling the roll speed of one or more stands by the feedforward method, control becomes impossible even if the tension fluctuation is large, so that the above-mentioned drawback can be solved and the width accuracy can be further improved.

Embodiment 11 FIG. FIG. 11 is a control block diagram showing a strip width control method for a hot rolling mill according to another embodiment of the present invention. In the hot tandem rolling line, a deviation between a set value and a tension between the upstream stands causes a deviation in a sheet width and a sheet thickness. Intermediate width gauge / intermediate thickness gauge 5 installed between upstream stands based on the deviation of the width / thickness
In FIG. 11, a correction value of the tension between the stands in at least two downstream stands is obtained from the data regarding the following equation, which is set in the calculator in advance by the tension control device in FIG. Is dynamically controlled by the looper control device 2 in a feed-forward manner so as to obtain a value based on.

First, the stand width / thickness is detected from the width / thickness gauge 5 (step S111). The following equation is based on the sheet width deviation ΔWf and the sheet thickness deviation Δhf actually measured by the intermediate sheet width gauge and the intermediate sheet thickness gauge, which are caused by the tension deviation generated in the upstream stand, and at least the set tension between the two stands downstream. By the tension deviations Δσb1 and Δσb2 of
The product sheet width / product sheet thickness at the final exit side of the rolling mill indicates a sheet width deviation ΔW and a sheet thickness deviation Δh that are out of target (step S1).
12).

[0153]

(Equation 26)

In order to eliminate the sheet width deviation and the sheet thickness deviation caused by the tension deviation generated in the upstream stand, Δσb
By changing the set tension from 1 ^* and Δσb2 ^* from the set tension, the target plate width and the target plate thickness can be simultaneously secured.

[0155]

[Equation 27]

Here, ΔW: sheet width fluctuation due to tension Δh: sheet thickness fluctuation due to tension ΔWf: actual sheet width fluctuation measured between upstream stands Δhf: actual sheet thickness fluctuation measured between upstream stands dW / dσb1: Sheet width variation coefficient due to tension between certain stands downstream dW / dσb2: Sheet width variation coefficient due to tension between certain stands downstream dh / dσb1: Sheet thickness variation coefficient due to tension between certain stands downstream dh / dσb2: Thickness variation coefficient due to tension between certain stands in the downstream Δσb1: Tension variation from set tension between certain stands downstream Δσb2: Tension variation from set tension between certain stands downstream Δσb1 ^* : Setting between certain stands downstream tension deviation target value from the tension Δσb2 ^*: a stand in the downstream Tension deviation target value from the set tension in

Therefore, based on ΔWf and Δhf collected at a fixed cycle or a fixed length cycle at this stand, when this point reaches between the target stands to be controlled, at least the downstream is set to Δσb1 ^* and Δσb2 ^*. 2
The tension between the stands in the stands is dynamically controlled by the looper control device 2 between the stands in a feed-forward manner (steps S113 and S11).
4).

In the first to eighth embodiments, the input value for obtaining the control amount is the tension deviation, not the actual actual deviation at the stand, but is calculated by multiplying this tension deviation by each coefficient. . The deviation obtained in this way includes an error, and the error may prevent the accuracy from being sufficiently maintained. In the ninth and tenth embodiments, control is performed to eliminate only a width deviation due to a fluctuation in tension generated in the upstream stand.

According to the present invention, with respect to the rolling by the hot tandem rolling mill, at least in order to eliminate the deviation in the width and thickness measured by the intermediate width gauge and the intermediate thickness gauge installed between the upstream stands, The width and thickness accuracy can be simultaneously improved by dynamically correcting the tension between two or more stands downstream using a looper in a feedforward manner.

Embodiment 12 FIG. FIG. 12 is a control block diagram showing a sheet width control method for a hot rolling mill according to another embodiment of the present invention. In the hot tandem rolling line, a deviation between a set value and a tension between the upstream stands causes a deviation in a sheet width and a sheet thickness. Intermediate width gauge / intermediate thickness gauge 5 installed between upstream stands based on the deviation of the width / thickness
In FIG. 12, a correction value of the tension between the stands in at least two downstream stands is obtained from the data relating to the following equation, which is set in the calculator in advance by the tension control device in FIG. Is dynamically controlled by the roll speed device 3 in a feed-forward manner so as to be a value based on.

First, the stand width / thickness is detected from the width / thickness gauge 5 (step S121). The following equation is based on the sheet width deviation ΔWf and the sheet thickness deviation Δhf actually measured by the intermediate sheet width gauge and the intermediate sheet thickness gauge, which are caused by the tension deviation generated in the upstream stand, and at least the set tension between the two stands downstream. By the tension deviations Δσb1 and Δσb2 of
The product sheet width / product sheet thickness at the final exit side of the rolling mill indicates a sheet width deviation ΔW and a sheet thickness deviation Δh that are out of target (step S1).
22).

[0162]

[Equation 28]

In order to eliminate the sheet width deviation and the sheet thickness deviation caused by the tension deviation generated in the upstream stand, Δσb
By changing the set tension from 1 ^* and Δσb2 ^* from the set tension, the target plate width and the target plate thickness can be simultaneously secured.

[0164]

(Equation 29)

Here, ΔW: sheet width fluctuation due to tension Δh: sheet thickness fluctuation due to tension ΔWf: actual sheet width fluctuation measured between upstream stands Δhf: actual sheet thickness fluctuation measured between upstream stands dW / dσb1: Sheet width variation coefficient due to tension between certain stands downstream dW / dσb2: Sheet width variation coefficient due to tension between certain stands downstream dh / dσb1: Sheet thickness variation coefficient due to tension between certain stands downstream dh / dσb2: Thickness variation coefficient due to tension between certain stands in the downstream Δσb1: Tension variation from set tension between certain stands downstream Δσb2: Tension variation from set tension between certain stands downstream Δσb1 ^* : Setting between certain stands downstream tension deviation target value from the tension Δσb2 ^*: a stand in the downstream Tension deviation target value from the set tension in

Therefore, when this point reaches between the target stands to be controlled, based on ΔWf and Δhf collected at a fixed cycle or a fixed length cycle at the stand,
The tension between the stands in at least two downstream stands is dynamically controlled by a roll speed control device between the stands in a feed-forward manner so that Δσb1 ^* and Δσb2 ^* are satisfied (steps S123 and S12).
4).

However, in roll speed control, FIG.
As shown in 2, when changing two downstream stands,
If the following formula is not satisfied, the tension between the stands increases, and the strip is cut or a loop occurs, which causes trouble in rolling.

With respect to each stand, the relationship between the outlet plate thickness and the outlet plate speed can be expressed by the following equation based on the principle of constant mass flow.

[0169]

[Equation 30]

Here, h _i : Thickness of each stand exit side V _i : Speed of each stand f _i : Advance rate of each stand h _L : Final stand Thickness of exit side V _L : Final stand speed f _L : Final stand advance rate

By keeping this mass flow balance constant, the rolling between the stands is stabilized. Therefore, Δ
If the speed correction by σb1 ^* is ΔV1 and the speed correction by σb2 ^* is ΔV2, the final speed set value at the most downstream stand is:

[0172]

(Equation 31)

The speed is determined by the speed setting device.

In the first to eighth embodiments, the input value for obtaining the control amount is the tension deviation, not the actual deviation result at the stand, but is calculated by multiplying this tension deviation by each coefficient. . The deviation obtained in this way includes an error, and the error may prevent the accuracy from being sufficiently maintained. In the ninth and tenth embodiments, control is performed to eliminate only a width deviation due to a fluctuation in tension generated in the upstream stand. Further, according to the eleventh embodiment, the board width
This is a control using a looper to simultaneously improve the accuracy of the plate thickness. In this method, the control amount is limited, and if the tension fluctuation becomes large, the control may be impossible.

According to the present invention, with respect to rolling by a hot tandem rolling mill, at least the width and thickness deviations measured by the intermediate width gauge and intermediate thickness gauge installed between the upstream stands are eliminated. By dynamically controlling the roll speed of two or more stands downstream in a feed-forward manner, even if the tension fluctuation is large, control becomes impossible, and
The speed setting device calculates the rolling of the strip in consideration of the effect of the rolling speed between the two stands so that the rolling of the strip does not become unstable, and the control is carried out by the rolling speed control device. The thickness accuracy can be further improved.

Embodiment 13 FIG. FIG. 13 is a control block diagram showing a sheet width control method for a hot rolling mill according to another embodiment of the present invention. In the hot tandem rolling line, when the tension deviates from the set value, a sheet width deviation occurs. In order to measure and compensate for this plate width deviation by the intermediate plate width meter 4 installed between the downstream stands, in FIG. A correction value of the tension between the stands in one stand is obtained by the looper control device 2 so as to be a value based on the calculated value.
Control dynamically.

First, the board width between stands is detected from the board width meter 4 (step S131). The following equation shows the plate width deviation ΔWf generated at the downstream stand and at least 1
The product width on the final exit side of the rolling mill indicates the width deviation ΔW that deviates from the target by the tension deviation Δσb from the set tension between the stands (step S132).

[0178]

(Equation 32)

In order to eliminate the plate width deviation due to ΔWb, the target plate width can be secured by changing from the set tension by Δσf ^{* according} to the following equation.

[0180]

[Equation 33]

Here, GI: integral gain GP: proportional gain ΔW: sheet width variation due to tension ΔWb: actual sheet width variation measured between downstream stands dW / dσf: sheet width due to tension between certain upstream stands Variation coefficient Δσf: Tension variation from set tension between certain stands upstream Δσf ^* : Target value of tension deviation from set tension between certain stands upstream

Therefore, at least the tension between the stands in one of the stands on the upstream side is set so as to be Δσf ^* based on ΔWb collected at a fixed cycle or a fixed length cycle at the stand.
The looper control device 2 between the stands dynamically controls in a feedback manner (step S13).
3).

In the first to eighth embodiments, the input value for obtaining the control amount is the tension deviation, not the actual deviation result at the stand, but is calculated by multiplying this tension deviation by each coefficient. . The deviation obtained in this way includes an error, and the error may prevent the accuracy from being sufficiently maintained. Further, since the ninth to twelfth embodiments are based on the feedforward control, each coefficient used for obtaining the control amount includes an error, and there is a possibility that the accuracy cannot be sufficiently maintained due to the error. is there.

According to the present invention, in regard to rolling by a hot tandem rolling mill, in order to eliminate a sheet width deviation measured by an intermediate sheet width meter installed between downstream stands, at least one sheet upstream of at least one stand. By controlling the tension dynamically with a looper and feedback system,
It provides high-precision control and can improve plate width accuracy.

Embodiment 14 FIG. FIG. 14 is a control block diagram showing a sheet width control method for a hot rolling mill according to another embodiment of the present invention. In the hot tandem rolling line, when the tension deviates from the set value, a sheet width deviation occurs. In order to measure and compensate for this plate width deviation by the intermediate plate width meter 4 installed between the downstream stands, in FIG. Then, the correction value of the tension between stands in one stand is obtained, and the roll speed control device 3 dynamically controls the tension based on the calculated value by a feedback method.

First, the board width between stands is detected from the board width meter 4 (step S141). The following equation shows the plate width deviation ΔWf generated at the downstream stand and at least 1
The product width on the final exit side of the rolling mill indicates the width deviation ΔW that deviates from the target by the tension deviation Δσb from the set tension between the stands (step S142).

[0187]

(Equation 34)

In order to eliminate the deviation of the plate width due to ΔWb, the target plate width can be secured by changing from the set tension by Δσf ^{* according} to the following equation.

[0189]

(Equation 35)

Here, GI: integral gain GP: proportional gain ΔW: sheet width fluctuation due to tension ΔWb: actual measured sheet width fluctuation between downstream stands dW / dσf: sheet width due to tension between certain stands upstream Variation coefficient Δσf: Tension variation from set tension between certain stands upstream Δσf ^* : Target value of tension deviation from set tension between certain stands upstream

Therefore, at least the tension between the stands in one of the stands on the upstream side is set so as to be Δσf ^* based on ΔWb collected at a fixed period or a fixed length period at the stand.
The roll speed between the stands is controlled dynamically by a feedback method (step S14).
3).

In the first to eighth embodiments, the input value for obtaining the control amount is the tension deviation, not the actual deviation actual at the stand, but is calculated by multiplying this tension deviation by each coefficient. . The deviation obtained in this way includes an error, and the error may prevent the accuracy from being sufficiently maintained. Further, since the ninth to twelfth embodiments are based on the feedforward control, each coefficient used for obtaining the control amount includes an error, and there is a possibility that the accuracy cannot be sufficiently maintained due to the error. is there. Furthermore, in the thirteenth embodiment, the control using a looper is used to improve the accuracy of the plate width. In this method, the control amount is limited, and the control may not be possible if the tension fluctuation becomes large.

According to the present invention, in regard to rolling by a hot tandem rolling mill, in order to eliminate a sheet width deviation measured by an intermediate sheet width gauge installed between downstream stands, at least one roll or more of a roll speed is provided upstream. Is dynamically controlled by a feedback method, the control is not disabled even if the tension fluctuation is large, and the plate width accuracy can be improved by high-precision control.

Embodiment 15 FIG. FIG. 15 is a control block diagram showing a sheet width control method for a hot rolling mill according to another embodiment of the present invention. In the tandem rolling line, when the tension deviates from the set value, a deviation in the width and thickness of the plate occurs. In order to measure and compensate for this sheet width / sheet thickness deviation with the intermediate sheet width gauge / intermediate sheet thickness gauge 5 installed between the downstream stands, in FIG. A correction value of the tension between the stands in at least two stands on the upstream side is obtained from the data on the expression (2), and the looper controller 2 dynamically controls the correction value to be a value based on the calculated value.

First, the stand width / thickness is detected from the intermediate width / intermediate thickness gauge 5 (step S151). The following equation shows a width deviation ΔW and a thickness deviation Δh in which the product width and the product thickness at the final exit side of the rolling mill due to the tension deviation Δσb from the set tension generated at the downstream stand deviate from the target (step). S152).

[0196]

[Equation 36]

At least the tension deviations Δσf1 ^* and Δσf2 ^* from the set tension between the two stands on the upstream
It is necessary to correct ΔW and Δh.

[0198]

(37)

Here, ΔW: plate width variation due to tension Δh: plate thickness variation due to tension dW / dσb: plate width variation coefficient due to tension between the stands dh / dσb: plate thickness variation coefficient due to tension between the stands Δσb: GwI1: Integral gain for plate width deviation in upstream stand 1 GwI2: Integral gain for plate width deviation in upstream stand 2 GwP1: Proportional gain for plate width deviation in upstream stand 1 GwP2: Upstream stand GhI1: Integral gain for thickness deviation in upstream stand 1 GhI2: Integral gain for thickness deviation in upstream stand 2 GhP1: Proportional gain for thickness deviation in upstream stand 1 GhP2: In upstream stand 2 Thickness deviation proportional gain Δσf1 ^* : A certain upstream Tension deviation target value from set tension between stand 1 Δσf2 ^* : Target tension deviation value from set tension between certain stands 2 upstream

Therefore, based on ΔWb and Δhb collected at a fixed cycle or a fixed length cycle at the stand, Δσf1 ^* , Δσf
At least the tension between the stands in the two upstream stands is dynamically controlled by a looper control device between the stands by a feedback method so that 2 ^* is obtained (steps S153 and S154).

In the first to eighth embodiments, the input value for obtaining the control amount is the tension deviation, not the actual deviation actual at the stand, but is calculated by multiplying this tension deviation by each coefficient. . The deviation obtained in this way includes an error, and the error may prevent the accuracy from being sufficiently maintained. Further, since the ninth to twelfth embodiments are based on the feedforward control, each coefficient used for obtaining the control amount includes an error, and there is a possibility that the accuracy cannot be sufficiently maintained due to the error. is there. Further, the thirteenth and fourteenth embodiments are controls for eliminating only a width deviation due to a change in tension.

According to the present invention, with respect to the rolling by the hot tandem rolling mill, at least the upstream is used to eliminate the deviation of the sheet width and the sheet thickness measured by the intermediate sheet width gauge and the intermediate sheet thickness gauge installed between the downstream stands. By dynamically controlling the tension between the two stands or more by a looper in a feedback manner, the above-mentioned drawbacks can be solved and, at the same time, the plate width and plate thickness accuracy can be further improved.

Embodiment 16 FIG. FIG. 16 is a control block diagram showing a strip width control method for a hot rolling mill according to another embodiment of the present invention. In the hot tandem rolling line, the deviation of the tension from the set value causes the deviation of the plate width and the plate thickness. In order to measure and compensate for this sheet width / sheet thickness deviation with the intermediate sheet width gauge / intermediate sheet thickness gauge 5 installed between the downstream stands, in FIG. According to the data on the formula
A correction value of the tension between the stands in at least two upstream stands is obtained, and the roll speed control device 3 dynamically controls the tension based on the calculated value in a feedback manner.

First, the stand plate width / plate thickness is detected from the intermediate plate width gauge / intermediate plate thickness gauge 5 (step S161). The following equation shows a width deviation ΔW and a thickness deviation Δh in which the product width and the product thickness at the final exit side of the rolling mill due to the tension deviation Δσb from the set tension generated at the downstream stand deviate from the target (step). S162).

[0205]

(38)

At least the tension deviations Δσf1 ^* and Δσf2 ^* from the set tension between the two stands on the upstream
It is necessary to correct ΔW and Δh.

[0207]

[Equation 39]

Here, ΔW: plate width variation due to tension Δh: plate thickness variation due to tension dW / dσb: plate width variation coefficient due to tension between the stands dh / dσb: plate thickness variation coefficient due to tension between the stands Δσb: GwI1: Integral gain for plate width deviation in upstream stand 1 GwI2: Integral gain for plate width deviation in upstream stand 2 GwP1: Proportional gain for plate width deviation in upstream stand 1 GwP2: Upstream stand GhI1: Integral gain for thickness deviation in upstream stand 1 GhI2: Integral gain for thickness deviation in upstream stand 2 GhP1: Proportional gain for thickness deviation in upstream stand 1 GhP2: In upstream stand 2 Thickness deviation proportional gain Δσf1 ^* : A certain upstream Tension deviation target value from set tension between stand 1 Δσf2 ^* : Target tension deviation value from set tension between certain stands 2 upstream

Therefore, based on ΔWb and Δhb collected at a fixed cycle or a fixed length cycle by the stand, Δσf1 ^* , Δσb
At least the tension between the stands in the two upstream stands is dynamically controlled in a feedback manner by the roll speed control device between the stands so that f2 ^* is satisfied (steps S163 and S164).

However, in roll speed control, FIG.
As shown at 66, when the two downstream stands are changed, if the following formula is not satisfied, the tension between the stands increases, and the strip is cut or a loop occurs, which causes trouble in rolling.

For each stand, from the principle of constant mass flow, the relationship between the outlet plate thickness and the outlet plate speed can be expressed by the following equation.

[0212]

(Equation 40)

Here, h _i : thickness of each stand exit side V _i : speed of each stand f _i : advance rate of each stand h _L : final stand exit side thickness V _L : speed of the last stand f _L : advance rate of the last stand

By keeping this mass flow balance constant, rolling between the stands is stabilized.

Therefore, the speed correction by Δσb1 ^* is ΔV1,
If the speed correction by σb2 ^* is ΔV2, the final speed set value at the most downstream stand is

[0216]

[Equation 41]

Are determined by the speed setting device.

In the first to eighth embodiments, the input value for obtaining the control amount is the tension deviation, not the actual deviation result at the relevant stand, but is calculated by multiplying this tension deviation by each coefficient. . The deviation obtained in this way includes an error, and the error may prevent the accuracy from being sufficiently maintained. Further, since the ninth to twelfth embodiments are based on the feedforward control, each coefficient used for obtaining the control amount includes an error, and there is a possibility that the accuracy cannot be sufficiently maintained due to the error. is there. Further, the thirteenth and fourteenth embodiments are controls for eliminating only the width deviation due to the tension fluctuation, and the fifteenth embodiment is a control using a looper. In this method, the control amount is limited, and the tension fluctuation is large. If so, control may be impossible.

According to the present invention, in regard to rolling by a hot tandem rolling mill, at least the width and thickness deviations measured by an intermediate width gauge and an intermediate thickness gauge installed between downstream stands must be eliminated. By dynamically controlling the roll speeds of two or more stands upstream using a feedback method, control becomes impossible even if the tension fluctuation is large, and the speed setting device takes into account the effect of the roll speed between the two stands and strips. The calculation is performed so that the rolling of the steel sheet does not become unstable, and control is performed by the roll speed control device. At the same time, the accuracy of the sheet width and thickness can be sufficiently improved without being restricted by the control amount.

Embodiment 17 FIG. FIG. 17 is a diagram showing a state during rolling showing a sheet width control method for a hot rolling mill according to another embodiment of the present invention. The advanced rate setting value is calculated by, for example, the following formula, and this is not corrected from the actual result.

[0221]

(Equation 42)

Where f: the calculated advance rate of the relevant stand R ': the flat roll radius of the relevant stand h ₀ : the plate thickness on the exit side of the relevant stand Φ _n : the neutral angle of the relevant stand

[0223] For this setting type, since the correction of the forward slip performance not been set, on the expression, adding Df _i terms as follows. This enables correction from the actual results. The following fN is used in the next strip to reflect the learning value.

[0224]

[Equation 43]

Next, a method of calculating the performance correction term will be described. This correction term is detected from the actual looper angle value.
(See FIG. 17.) First, the actual length of the strip between stands is calculated. The length of the strip calculated here is assumed to be the actual length: L _i ^Act and the set length: L _i ^Set . The specific method is as follows.

[0226]

[Equation 44]

Where, q _i ^Act : actual looper angle value q _i ^Set : looper angle set value DA _i : length between looper shaft and upstream stand DB _i : length between looper shaft and downstream stand DL _i : looper arm length HPL _i: looper height RPL _i: looper roll radius L _i ^Act: looper contact upstream strip length actual value (between looper and stand) L _i ^Set: looper contact downstream strip length actual value (between looper and stand) i: looper Equipment number

[0228] Here, the error amount by subtracting the set value strip length from actual strip length: detecting a DL _i.

[0229]

[Equation 45]

Using the detected length, a correction amount of the advance rate is calculated from the time required to move between the lengths and the calculated roll speed.

[0231]

[Equation 46]

Here, T _i : the transport time of the strip length between the stands and the stand, V _i ^Set : the set value of the roll rotation speed Df _i : Forward slip correction amount calculation value (relative amount) Df _i, is applied to the following rolled strip setup control as described above.

According to the present invention, since the learning correction can be performed based on the achievement of the advanced ratio, the advanced ratio of the setup control is set with high accuracy. As a result, the speed balance between the stands is maintained, and the fluctuation of the tension at the front end portion is suppressed, so that the accuracy of the width of the leading end portion can be improved.

Embodiment 18 FIG. FIG. 18 shows a speedometer 6 showing a method of controlling a sheet width of a hot rolling mill according to another embodiment of the present invention.
FIG. 9 is a diagram relating to the modification of the biting stand and the next stand using the. Regarding each stand, the relationship between the outlet plate thickness and the outlet plate speed can be expressed by the following equation based on the principle of constant mass flow.

[0235]

[Equation 47]

Where h _i : thickness of each stand exit side V _i : speed of each stand f _i : each stand advance rate h _L : final stand exit side thickness V _L : last stand speed f _L : last stand advance rate

By keeping this mass flow balance constant, the rolling between the stands is stabilized.

In actual rolling, when the leading end portion of the strip successively bites into each stand, errors occur in the actual plate speed and the calculated plate speed due to various conditions. Due to the plate speed error, the mass flow balance may be lost, thereby causing a change in tension.

[0239] This plate speed error causes a speed imbalance when the leading end of the strip bites into the next stand, so that when the stand-side plate speed can be detected at the stand, the next stand is set in advance. Perform speed correction. The speed of the next stand to be corrected is specifically as follows.

[0240]

[Equation 48]

Where h _i : biting stand exit side plate thickness setting value h _{i + 1} : next stand exit side plate thickness setting value V _Si : biting stand exit side plate speed actual value V _{i + 1} ^NEW : next stand correction speed f _{i + 1} : Next stand advance rate

This series of speed correction control is dynamically performed as shown in FIG. 18 when the leading end of the strip successively bites into each stand.

According to the present invention, by correcting the speed of the next stand with respect to the biting stand, the speed imbalance factor generated at the biting stand is reflected in advance on the speed of the next stand, so that the speed of the next stand is changed. Ensure balance. As a result, tension fluctuation between stands can be reduced, and plate width accuracy can be improved.

Embodiment 19 FIG. FIG. 19 shows a control flow showing a method of controlling a sheet width of a hot rolling mill according to another embodiment of the present invention. The specific operation is as follows.

After the tip end portion of the strip has been engaged with the stand, the tension control of the stand is dynamically performed until the next stand is engaged and the looper between stands rises.

The current (: Iq), the voltage (: φ), the mill rotation speed (: N), and the rolling load (: F) are detected from the time when the tip of the strip is bitten by the stand. From these performance data, the motor torque is calculated, and the rolling torque is calculated.

[0247]

[Equation 49]

Here, G _f : the rolling torque of the corresponding stand GR: the corresponding stand GM _f : the motor torque of the corresponding stand (GM _f = Iq ·
φ ・ K) Iq: Current of the stand φ: Voltage of the stand K: Mill constant of the stand GD: Stand

[0249]

[Equation 50]

Then, the rolling load torque is calculated, and finally the exit side tension of the stand is dynamically controlled from the rolling load torque and the rolling torque obtained as described above.

[0251]

(Equation 51)

[0252] However, T _f: the stand delivery side tension calculated value G _f: the stand rolling torque T _b: the stand entry side tension a · F _f: the stand rolling load torque a: the stand torque arm coefficient b: the Stand entry side tension calculation coefficient c: Applicable stand exit side tension calculation coefficient

Note that a used here is obtained by calculation, and is obtained by the following equation.

[0254]

(Equation 52)

Where, Δa: applicable stand Torque arm calculation coefficient F _t : applicable stand

The output side tension (: T _f ) calculated here is dynamically controlled so as to become the set target tension (: T _f ^* ).

According to the present invention, the strip is bitten into both the stand and the next stand, and the tension applied to the tip end of the strip until the looper between stands rises is dynamically controlled. Can reduce plate width fluctuation,
Plate width accuracy can be improved.

Embodiment 20 FIG. FIG. 20 shows a control flow showing a method of controlling a sheet width of a hot rolling mill according to another embodiment of the present invention. The control method up to the rise of the looper between stands at the leading end of the strip is shown.
By adopting a learning coefficient for the output side tension that is dynamically corrected at the stand, dynamic control can be performed so as to reach the set target tension, and the tension fluctuation when shifting to loop control between stands is suppressed. I can do it.
The dynamic control method of the outlet tension is the same as that of the fifth embodiment, and the description is omitted.

The specific method of reflecting the learning coefficient is as follows.

[0260]

(Equation 53)

Here, T _f : calculated value of the tension on the exit side of the corresponding stand C _t : learning coefficient of the tension on the relevant stand T _f ^* : set value of the tension on the exit side of the relevant stand

The learning coefficient employed here is obtained by performing smoothing using the detectable actual tension and the set tension value after the start of the looper control between stands at the leading end for each strip. It can be obtained from the equation.

[0263]

(Equation 54)

However, C _t ^NEW : the corresponding value of the stand-side exit side tension learning coefficient update value C _t ^NOW : the corresponding stand-side exit side tension learning coefficient current value α: the corresponding stand learning coefficient smoothing coefficient T _f : the corresponding stand current downstream correction tension

According to the present invention, the dynamic control amount is used to dynamically control the tension applied to the strip end portion from the time when the strip end portion is engaged with the stand to the time when the strip end is engaged with the next stand and the looper between stands rises. By using a learning coefficient, the precision of the tension at the tip end of the strip with respect to the tension set value can be improved, the amount of tension fluctuation from the transition to the looper control between stands can be reduced, and the plate width precision can be improved.

Embodiment 21 FIG. FIG. 21 is a control block diagram showing a sheet width control method for a hot rolling mill according to another embodiment of the present invention. Regarding each stand, the relationship between the outlet plate thickness and the outlet plate speed can be expressed by the following equation based on the principle of constant mass flow.

[0267]

[Equation 55]

Here, h _i : thickness of each stand exit side V _i : speed of each stand f _i : advance rate of each stand h _L : final stand exit side thickness V _L : speed of the last stand f _L : advance rate of the last stand

By keeping this mass flow balance constant, rolling between the stands is stabilized.

In the actual rolling, errors occur in the actual plate speed and the calculated plate speed due to various conditions when the tip of the strip bites into each stand sequentially. Due to the plate speed error, the mass flow balance may be lost, thereby causing a change in tension.

In consideration of these conditions, the following correction control is performed to ensure the mass flow balance.

[0272] strip tip portion, if the plate speed actual detected when biting to a stand and a V _Si, by the following equation from the relationship between the mass flow balance from the plate speed actual and the stand speed setting , Speed correction value can be obtained.

[0273]

[Equation 56]

This V _i ^NEW is the corrected speed calculation value for the stand. Further, it is necessary to correct the speed of all the stands upstream from the stand where the speed has been corrected in order to secure the mass flow balance. Specifically, it is as follows.

[0275]

[Equation 57]

However, V ^NEW : Finishing stand modified speed V ^PRE : Finishing stand initial speed

This series of speed correction control is dynamically performed when the leading end of the strip successively bites into each stand.

According to the present invention, by correcting the speed of all the stands upstream from the biting stand, the speed balance of each stand can be maintained, and stable rolling can be performed. As a result, tension fluctuation between stands can be reduced, and plate width accuracy can be improved.

Embodiment 22 FIG. FIG. 22 is a control block diagram showing a sheet width control method for a hot rolling mill according to another embodiment of the present invention. In the hot tandem rolling line, the tension between the stands deviates from the set value to generate a plate width deviation. In order to correct this plate width deviation, in FIG. 22, a correction value of the tension between the stands in at least one of the stands at the upstream and downstream is obtained from the data relating to the following equation which is set in the computer in advance by the tension control device. The upstream and downstream looper control devices dynamically control the upstream and the downstream in a feedback manner and the downstream in a feedforward manner so as to obtain a value based on the calculated value.

In the following equation, the product sheet width on the final exit side of the rolling mill deviates from the target by the tension deviation Δσm generated at the intermediate stand and the tension deviation Δσf from the set tension between at least one stand upstream. The plate width deviation ΔW is shown.

[0281]

[Equation 58]

Similarly, the following equation shows that the product sheet width on the final exit side of the rolling mill is obtained by the tension deviation Δσm generated at the intermediate stand and the tension deviation Δσb from the set tension between at least one stand downstream. The deviation of the sheet width ΔW from the target is shown (step S221).

[0283]

[Equation 59]

The target plate width can be secured by changing the set tension by Δσf ^* from the set tension according to the following equation in order to eliminate the plate width deviation due to Δσm.

[0285]

[Equation 60]

Here, GI: integral gain GP: proportional gain

Similarly, in order to eliminate the plate width deviation due to Δσm, the target plate width can be secured by changing from the set tension by Δσb ^{* according} to the following equation.

[0288]

[Equation 61]

Here, ΔW: plate width variation due to tension dW / dσf: plate width variation coefficient due to tension between upstream stands Δσf: tension variation from set tension between upstream stands dW / dσm: plate due to tension between intermediate stands Width variation coefficient Δσm: Tension variation from set tension between intermediate stands dW / dσb: Strip width variation coefficient due to tension between certain stands downstream Δσb: Tension variation from set tension between certain stands downstream Δσb ^* : Downstream Tension deviation target value from set tension between certain stands Δσf ^* : Target tension deviation value from set tension between certain stands upstream

Therefore, the tension between the stands in at least one stand upstream and downstream is adjusted so that Δσb ^* and Δσf ^* are obtained by a looper control device between the stands on both the upstream and downstream sides in a feedback manner to the upstream. The downstream is dynamically controlled by a feedforward method (steps S222 and S223).

The same strip is rolled from the upstream to the downstream. If a tension deviation occurs at the intermediate stand at a certain point, the point at which the upstream looper is to be rolled has already been rolled to a point where the sheet width variation has occurred. The tension is controlled by a feedback method so that the point does not become like the point at which is generated. Since a tension deviation has occurred at this point, the looper on the downstream side controls the tension in a feed-forward manner when this point reaches its own stand. In addition, the point to be rolled from now on is already controlled upstream before reaching the intermediate stand in a feedback manner,
If the tension still fluctuates in the intermediate stand, the value is controlled again by the feedforward dynamic control from this value. In this way, by applying the control twice to one point, the defect of the plate width accuracy due to the control of only one of the feedback method or the feedforward method of the first to sixteenth embodiments is eliminated. Will improve.

According to the present invention, in the hot tandem rolling line, the sheet width deviation caused by the deviation between the set value and the tension between the intermediate stands is reduced by at least one of the upstream and downstream widths.
The tension between the stands or higher is dynamically controlled by a looper device in a feedback system for the upstream and a feedforward system for the downstream. In the first to sixteenth embodiments, only one control is performed at one point of the strip. The accuracy failure caused by not being applied to the same point is controlled twice by the same point, and by applying the control of the two systems, the target plate width is secured and from the front end to the tail end of the material to be rolled. Can improve the width accuracy.

Embodiment 23 FIG. FIG. 23 is a control block diagram showing a strip width control method for a hot rolling mill according to another embodiment of the present invention. In the hot tandem rolling line, the tension between the stands deviates from the set value to generate a plate width deviation. In order to correct this plate width deviation, in FIG. 23, a corrected value of the tension between the stands in at least one stand at the upstream and downstream is obtained from the data regarding the following equation set in advance by the computer by the tension control device. , The upstream is a roll speed device, the downstream is a looper control device so that it becomes a value based on the calculated value,
The upstream system is dynamically controlled by a feedback system, and the downstream system is dynamically controlled by a feedforward system.

The following equation shows that the product sheet width on the final exit side of the rolling mill deviates from the target by the tension deviation Δσm generated at the intermediate stand and the tension deviation Δσf from the set tension between at least one stand upstream. The plate width deviation ΔW is shown.

[0295]

(Equation 62)

Similarly, the following equation shows that the product sheet width on the final exit side of the rolling mill is expressed by the tension deviation Δσm generated at the intermediate stand and the tension deviation Δσb from the set tension between at least one stand downstream. The width deviation ΔW deviating from the target is shown (step S231).

[0297]

[Equation 63]

The target plate width can be secured by changing the tension from the set tension by Δσf ^{* according} to the following equation in order to eliminate the plate width deviation due to Δσm.

[0299]

[Equation 64]

Here, GI: integral gain GP: proportional gain

Similarly, in order to eliminate the plate width deviation due to Δσm, the target plate width can be secured by changing from the set tension by Δσb ^{* according} to the following equation.

[0302]

[Equation 65]

Here, ΔW: plate width variation due to tension dW / dσf: plate width variation coefficient due to tension between upstream stands Δσf: tension variation from set tension between upstream stands dW / dσm: plate due to tension between intermediate stands Width variation coefficient Δσm: Tension variation from set tension between intermediate stands dW / dσb: Strip width variation coefficient due to tension between certain stands downstream Δσb: Tension variation from set tension between certain stands downstream Δσb ^* : Downstream Tension deviation target value from set tension between certain stands Δσf ^* : Target tension deviation value from set tension between certain stands upstream

Therefore, the tension between the stands in at least one of the upstream and downstream stands is adjusted so that Δσb ^* and Δσf ^* are obtained. The upstream is provided by a roll speed control device, the downstream is provided by a looper control device, and the upstream is provided by a feedback system. Then, the downstream is dynamically controlled by a feedforward method (steps S232 and S233).

The same strip is rolled from upstream to downstream. When a tension deviation occurs at the intermediate stand at a certain point, the roll speed control device between the upstream stands determines the point at which the strip is to be rolled. The tension is controlled by a feedback method so that the point does not become a point where the sheet width variation has already occurred due to the rolling. Because a tension deviation occurred at this point,
When this point reaches its own stand, the looper control device between the stands on the downstream side controls the tension in a feedforward manner. Further, the point to be rolled from now on is already controlled upstream before reaching the intermediate stand by the feedback method, but if there is still a tension fluctuation in the intermediate stand, the feedforward is calculated from this value. With the dynamic control of the method,
It is controlled again using the looper control device. In this way, by applying the control twice to one point, the defect of the plate width accuracy due to the control of only one of the feedback method or the feedforward method of the first to sixteenth embodiments is eliminated. Will improve.

In the twenty-second embodiment, when controlling the upstream tension, a looper is used, so that the control amount is restricted, and if the fluctuation of the tension becomes large, the control may be impossible.

According to the present invention, in the hot tandem rolling line, the sheet width deviation caused by the deviation between the set value and the tension between the intermediate stands is reduced by at least one of upstream and downstream.
The tension above the stand is dynamically controlled upstream by a roll speed device and downstream by a looper control device using a feedback system for the upstream and a feedforward system for the downstream. Control is not impossible by the feedback method, and the control is performed twice for the same point. By applying the control of the two methods, the target sheet width is secured and the sheet width accuracy from the leading end to the tail end of the material to be rolled. Can be improved.

Embodiment 24 FIG. FIG. 24 is a control block diagram showing a strip width control method for a hot rolling mill according to another embodiment of the present invention. In the hot tandem rolling line, the tension between the stands deviates from the set value to generate a plate width deviation. In order to correct this plate width deviation, in FIG. 24, a corrected value of the tension between the stands in at least one stand in the upstream and downstream is obtained from the data concerning the following equation which is set in the computer in advance by the tension control device. , The downstream is a roll speed device and the upstream is a looper control device so that it becomes a value based on the calculated value,
The upstream system is dynamically controlled by a feedback system, and the downstream system is dynamically controlled by a feedforward system.

In the following equation, the product width on the final exit side of the rolling mill deviates from the target by the tension deviation Δσm generated at the intermediate stand and the tension deviation Δσf from the set tension between at least one stand upstream. The plate width deviation ΔW is shown.

[0310]

[Equation 66]

Similarly, the following equation shows that the product sheet width on the final exit side of the rolling mill is obtained by the tension deviation Δσm generated at the intermediate stand and the tension deviation Δσb from the set tension between at least one downstream stand. The deviation of the sheet width ΔW from the target is shown (step S241).

[0312]

[Equation 67]

The target plate width can be secured by changing the set tension by Δσf ^* from the set tension according to the following equation in order to eliminate the plate width deviation due to Δσm.

[0314]

[Equation 68]

Here, GI: integral gain GP: proportional gain

Similarly, in order to eliminate the plate width deviation due to Δσm, the target plate width can be secured by changing from the set tension by Δσb ^{* according} to the following equation.

[0317]

[Equation 69]

Here, ΔW: plate width variation due to tension dW / dσf: plate width variation coefficient due to tension between upstream stands Δσf: tension variation from set tension between upstream stands dW / dσm: plate due to tension between intermediate stands Width variation coefficient Δσm: Tension variation from set tension between intermediate stands dW / dσb: Strip width variation coefficient due to tension between certain stands downstream Δσb: Tension variation from set tension between certain stands downstream Δσb ^* : Downstream Tension deviation target value from set tension between certain stands Δσf ^* : Target tension deviation value from set tension between certain stands upstream

Accordingly, the tension between the stands in at least one of the stands upstream and downstream is adjusted so that Δσb ^* and Δσf ^* are obtained. For the downstream, dynamic control is performed by a feedforward method (steps S242 and S243).

The same strip is rolled from upstream to downstream. When a tension deviation occurs at the intermediate stand at a certain point, the point to be rolled from now on is determined by the looper control device between the upstream stands. The tension is controlled by a feedback method so as not to be a point where the sheet width is changed due to rolling. Since a tension deviation occurred at this point, the roll speed control device between the stands on the downstream side controls the tension by a feedforward method when this point reaches the stand. In addition, the point to be rolled from now on is already controlled upstream before reaching the intermediate stand in a feedback manner,
If the tension still fluctuates in the intermediate stand, the value is controlled again by the feedforward dynamic control from this value. In this way, by applying the control twice to one point, the defect of the plate width accuracy due to the control of only one of the feedback method or the feedforward method of the first to sixteenth embodiments is eliminated. Will improve.

In the twenty-second embodiment, when controlling the downstream tension, a looper is used, so that the control amount is restricted, and if the fluctuation of the tension becomes large, the control may be impossible. According to the present invention, in a hot tandem rolling line,
The plate width deviation caused by the deviation of the tension between the intermediate stands and the set value occurs. The tension between at least one stand on the upstream and downstream sides is reduced by a roll speed device on the downstream side, and the looper control device on the upstream side. In the feedback system, the feed-forward system is used to dynamically control the downstream, so that even if the tension fluctuation is large, it cannot be controlled by the downstream feed-forward system. It is possible to improve the width accuracy from the end to the tail end.

Embodiment 25 FIG. FIG. 25 is a control block diagram showing a sheet width control method for a hot rolling mill according to another embodiment of the present invention. In the hot tandem rolling line, the tension between the stands deviates from the set value to generate a plate width deviation. In order to correct this plate width deviation, in FIG. 25, a correction value of the tension between the stands in at least one of the stands at the upstream and downstream is obtained from the data relating to the following equation set in advance by the computer by the tension control device. The upstream and downstream roll speed controllers dynamically control the upstream and the downstream in a feedback manner and the downstream in a feedforward manner so as to obtain a value based on the calculated value.

The following equation shows that the product sheet width on the final exit side of the rolling mill deviates from the target by the tension deviation Δσm generated at the intermediate stand and the tension deviation Δσf from the set tension between at least one stand upstream. The plate width deviation ΔW is shown.

[0324]

[Equation 70]

Similarly, the following equation shows that the product sheet width at the final exit side of the rolling mill is obtained by the tension deviation Δσm generated at the intermediate stand and the tension deviation Δσb from the set tension between at least one downstream stand. The deviation of the sheet width ΔW from the target is shown (step S251).

[0326]

[Equation 71]

In order to eliminate the deviation of the sheet width due to Δσm, the target sheet width can be secured by changing from the set tension by Δσf ^{* according} to the following equation.

[0328]

[Equation 72]

Here, GI: integral gain GP: proportional gain

Similarly, in order to eliminate the plate width deviation due to Δσm, the target plate width can be secured by changing the set tension by Δσb ^* from the set tension according to the following equation.

[0331]

[Equation 73]

Here, ΔW: plate width variation due to tension dW / dσf: plate width variation coefficient due to tension between upstream stands Δσf: tension variation from set tension between upstream stands dW / dσm: plate due to tension between intermediate stands Width variation coefficient Δσm: Tension variation from set tension between intermediate stands dW / dσb: Strip width variation coefficient due to tension between certain stands downstream Δσb: Tension variation from set tension between certain stands downstream Δσb ^* : Downstream Tension deviation target value from set tension between certain stands Δσf ^* : Target tension deviation value from set tension between certain stands upstream

Therefore, the tension between the stands in at least one of the upstream and downstream stands is adjusted so that Δσb ^* and Δσf ^* are obtained. Then, the downstream is dynamically controlled by the feedforward method (steps S252 and S253).

However, in roll speed control, FIG.
As shown in FIG. 5, when the two stands of the upstream and the downstream are changed, if the following formula is not satisfied, the tension between the stands becomes large, and the strip is cut or a loop occurs to cause trouble in rolling. .

For each stand, the relationship between the outlet plate thickness and the outlet plate speed can be expressed by the following equation based on the principle of constant mass flow.

[0336]

[Equation 74]

Here, h _i : thickness of each stand exit side V _i : speed of each stand f _i : advance rate of each stand h _L : final stand exit side thickness V _L : speed of last stand f _L : advance rate of last stand

By keeping the mass flow balance constant, the rolling between the stands is stabilized.

The speed correction amounts between the upstream and downstream stands satisfying the above-mentioned tension are denoted by ΔVf and ΔVb, respectively. The speed correction values at the stand upstream from the upstream stand f and downstream from the downstream stand b are: If the above-described principle of the constant mass flow is not satisfied, even if the width deviation is eliminated by correcting the tension on the upstream side and the downstream side, it is impossible to control by interaction.

Therefore, the upstream and downstream speed correction values Vi
-1 * and Vi + 1 * are calculated by the upstream speed setting device and the downstream speed setting device, and must satisfy the following equations.

[0341]

[Equation 75]

[0342]

[Equation 76]

The same strip is rolled from upstream to downstream. When a tension deviation occurs at an intermediate stand at a certain point, the roll speed control device between the upstream stands determines the point at which the strip is to be rolled. The tension is controlled by a feedback method so that the point does not become a point where the sheet width variation has already occurred due to the rolling. Because a tension deviation occurred at this point,
When this point reaches its own stand, the roll speed control device between the stands on the downstream side controls the tension in a feed-forward manner. Further, the point to be rolled from now on is already controlled upstream before reaching the intermediate stand by the feedback method, but if there is still a tension fluctuation in the intermediate stand, the feedforward is calculated from this value. It is controlled again by the dynamic control of the system. In this way, by applying the control twice to one point, the defect of the plate width accuracy due to the control of only one of the feedback method or the feedforward method of the first to sixteenth embodiments is eliminated. Will improve.

[0344] Embodiments 22 to 24 are control using a looper. In this method, the control amount is limited, and control may not be possible if the tension fluctuation becomes large. According to the present invention, in the hot tandem rolling line, the tension between the intermediate stands and the sheet width deviation due to the occurrence of deviation from the set value, the tension between at least one of the upstream and downstream stands is increased by the roll speed device. Dynamic control ensures that the upstream feedback system and the downstream feedforward system do not become uncontrollable, and achieves stable control of strip rolling with a speed setting device in consideration of the effects of upstream and downstream speed corrections. And two for the same point
By applying the control of two times and the control of two systems, the target plate width can be secured and the plate width accuracy from the front end to the tail end of the material to be rolled can be improved.

Embodiment 26 FIG. FIG. 26 is a control block diagram showing a sheet width control method for a hot rolling mill according to another embodiment of the present invention. In the hot tandem rolling line, the tension between the stands deviates from the set value to generate a plate width deviation. In order to correct the plate width deviation measured by the intermediate plate width meter installed on this intermediate stand, in FIG. 26, at least the upstream and downstream A corrected value of the tension between the stands in one stand is obtained, and the control is dynamically performed by the upstream and downstream looper control devices so as to be a value based on the calculated value.

The following equation shows that the product sheet width at the final exit side of the rolling mill is different from the target by the sheet width deviation ΔWm generated at the intermediate stand and the tension deviation Δσf from the set tension between at least one stand upstream. The deviation ΔW of the strip width is shown.

[0347]

[Equation 77]

Similarly, the following equation shows that the product sheet width at the final exit side of the rolling mill is obtained by the sheet width deviation ΔWm generated at the intermediate stand and the tension deviation Δσb from the set tension between at least one stand downstream. , The width deviation ΔW deviating from the target (step S261).

[0349]

[Equation 78]

In order to eliminate the plate width deviation ΔWm, the tension is controlled by changing from the set tension by Δσf ^{* according} to the following equation.
The target plate width can be secured.

[0351]

[Expression 79]

Similarly, in order to eliminate the plate width deviation ΔWm, the target plate width can be secured by changing the set tension by Δσf ^* from the set tension according to the following equation.

[0353]

[Equation 80]

Here, GI: integral gain GP: proportional gain

Here, ΔW: Sheet width fluctuation due to tension ΔWm: Actual sheet width fluctuation value measured by an intermediate sheet width meter dW / dσf: Sheet width fluctuation coefficient due to tension between upstream stands Δσf: Set tension between upstream stands DW / dσb: Coefficient of plate width variation due to tension between certain stands downstream Δσb: Tension variation from set tension between certain stands downstream Δσb ^* : Tension deviation target from set tension between certain stands downstream Value Δσf ^* : Target tension deviation value from the set tension between certain stands on the upstream side

Therefore, the tension between the stands in at least one of the stands upstream and downstream is adjusted so that Δσb ^* and Δσf ^* are obtained by a looper control device between the stands in both the upstream and downstream sides, and the upstream side is controlled in a feedback manner with respect to the upstream. The downstream is dynamically controlled by a feedforward method (steps S262 and S263).

[0357] The same strip is rolled from upstream to downstream. When a sheet width deviation occurs at an intermediate stand at a certain point, the point to be rolled from now on is determined by a looper control device between the upstream stands. The tension is controlled by a feedback method so as not to be a point where the rolling has already occurred and a width variation has occurred. Since a plate width deviation has occurred at this point, the looper control device between the stands on the downstream side controls the tension by a feedforward method when this point reaches its own stand. In addition, the point to be rolled from now on is already controlled upstream before reaching the intermediate stand in a feedback manner. It is controlled again by the forward dynamic control.

Since control is performed only by one of the feedback method and the feedforward method in the first to sixteenth embodiments, control is performed only once for one point, and there is a possibility that the sheet width accuracy is defective. There is. Further, in the above-mentioned Embodiments 22 to 25, the input value for obtaining the control amount is the tension deviation, not the actual deviation actual at the stand, but is calculated by multiplying this tension deviation by each coefficient. The deviation obtained in this way includes an error, and the error may prevent the accuracy from being sufficiently maintained.

However, according to the present invention, in the hot tandem rolling line, the width deviation due to the deviation between the set value and the tension between the intermediate stands is measured by the intermediate width meter, and the actual width deviation is measured. In order to compensate for this deviation, the tension between at least one stand upstream and downstream is dynamically controlled twice by a looper device for one point in a feedback system upstream and a feed forward system downstream. Two times for one point and
By applying the two types of control, it is possible to secure the target plate width and improve the plate width accuracy from the front end to the tail end of the material to be rolled.

Twenty-seventh Embodiment FIG. 27 is a control block diagram showing a sheet width control method for a hot rolling mill according to another embodiment of the present invention. In the hot tandem rolling line, the tension between the stands deviates from the set value to generate a plate width deviation. In order to correct the width deviation measured by the intermediate width meter installed on this intermediate stand, in FIG. 27, at least upstream and downstream at A correction value of the tension between the stands in one stand is obtained, and the upstream is dynamically controlled by a roll speed device and the downstream is controlled by a looper control device so as to be a value based on the calculated value.

The following equation shows that the product sheet width on the final exit side of the rolling mill is different from the target by the sheet width deviation ΔWm generated at the intermediate stand and the tension deviation Δσf from the set tension between at least one stand upstream. The deviation ΔW of the strip width is shown.

[0362]

[Equation 81]

Similarly, the following equation shows that the product sheet width at the final exit side of the rolling mill is obtained from the sheet width deviation ΔWm generated at the intermediate stand and the tension deviation Δσb from the set tension between at least one stand downstream. , The width deviation ΔW deviating from the target (step S271).

[0364]

(Equation 82)

In order to eliminate the plate width deviation ΔWm, the tension is changed from the set tension by Δσf ^{* in accordance} with the following equation, and is controlled.
The target plate width can be secured.

[0366]

[Equation 83]

Here, GI: integral gain GP: proportional gain

Similarly, in order to eliminate the plate width deviation ΔWm, the target plate width can be secured by changing from the set tension by Δσb ^{* according} to the following equation.

[0369]

[Equation 84]

Here, ΔW: Sheet width fluctuation due to tension ΔWm: Actual sheet width fluctuation measured by an intermediate sheet width meter dW / dσf: Sheet width fluctuation coefficient due to tension between upstream stands Δσf: Set tension between upstream stands DW / dσb: Coefficient of plate width variation due to tension between certain stands downstream Δσb: Tension variation from set tension between certain stands downstream Δσb ^* : Tension deviation target from set tension between certain stands downstream Value Δσf ^* : Target tension deviation value from the set tension between certain stands on the upstream side

Therefore, the tension between the stands in at least one of the stands upstream and downstream is adjusted so that Δσb ^* and Δσf ^* are obtained. The upstream is controlled by the roll speed control device, the downstream is controlled by the looper control device, and the upstream is controlled by the feedback system. Then, the downstream is dynamically controlled by the feedforward method (steps S272 and S273).

[0372] The same strip is rolled from upstream to downstream. When a width deviation at the intermediate stand occurs at a certain point, the roll speed control device between the upstream stands determines the point at which the strip is to be rolled. The tension is controlled by a feedback system so that the point does not become a point where the sheet width variation has already occurred due to rolling.
Since a plate width deviation has occurred at this point, the looper control device between the stands on the downstream side controls the tension by a feedforward method when this point reaches its own stand. In addition, the point to be rolled from now on is already controlled upstream before reaching the intermediate stand in a feedback manner,
Still, if there is a fluctuation in the plate width at the intermediate stand, it is controlled again by the feedforward dynamic control from this value.

Since control is performed by only one of the feedback system and the feedforward system in the first to sixteenth embodiments, control is performed only once for one point, and there is a possibility that the sheet width accuracy is defective. There is. Further, in the above-mentioned Embodiments 22 to 25, the input value for obtaining the control amount is the tension deviation, not the actual deviation actual at the stand, but is calculated by multiplying this tension deviation by each coefficient. The deviation obtained in this way includes an error, and the error may prevent the accuracy from being sufficiently maintained. Further, in the twenty-sixth embodiment, when controlling the tension in the upstream, the control amount is restricted due to the use of the looper, and the control may not be possible if the tension variation becomes large.

According to the present invention, in the hot tandem rolling line, the width difference between the intermediate stand and the set value due to the occurrence of the deviation from the set value is measured by the intermediate width meter, and the actual width deviation is used. In order to compensate for this deviation, the tension between at least one stand upstream and downstream is dynamically controlled by a roll speed device on the upstream side and a looper control device on the downstream side. Can function satisfactorily without being constrained, and it is possible to secure the target plate width and improve the plate width accuracy from the front end to the tail end of the material to be rolled.

Embodiment 28 FIG. FIG. 28 is a control block diagram showing a sheet width control method for a hot rolling mill according to another embodiment of the present invention. In the hot tandem rolling line, the tension between the stands deviates from the set value to generate a plate width deviation. In order to correct the plate width deviation measured by the intermediate plate width meter installed on the intermediate stand, in FIG. 28, at least upstream and downstream at least data on the following equations set in the computer by the tension control device in advance. A corrected value of the tension between stands in one stand is obtained, and the downstream is dynamically controlled by a roll speed device and the upstream is controlled by a looper control device so as to be a value based on the calculated value.

The following equation gives the product width on the final exit side of the rolling mill from the target by the width deviation ΔWm generated at the intermediate stand and the tension deviation Δσf from the set tension between at least one stand upstream. The deviation ΔW of the strip width is shown.

[0377]

[Equation 85]

Similarly, the following equation shows that the product sheet width at the final exit side of the rolling mill is obtained from the sheet width deviation ΔWm generated at the intermediate stand and the tension deviation Δσb from the set tension between at least one stand downstream. , The width deviation ΔW deviating from the target (step S281).

[0379]

[Equation 86]

In order to eliminate the plate width deviation ΔWm, the tension is controlled by changing from the set tension by Δσf ^{* according} to the following equation.
The target plate width can be secured.

[0381]

[Equation 87]

Here, GI: integral gain GP: proportional gain

Similarly, in order to eliminate the plate width deviation ΔWm, the target plate width can be secured by changing the set tension by Δσb ^* from the set tension according to the following equation.

[0384]

[Equation 88]

Here, ΔW: Sheet width fluctuation due to tension ΔWm: Actual sheet width fluctuation value measured by an intermediate sheet width meter dW / dσf: Sheet width fluctuation coefficient due to tension between upstream stands Δσf: Set tension between upstream stands DW / dσb: Coefficient of plate width variation due to tension between certain stands downstream Δσb: Tension variation from set tension between certain stands downstream Δσb ^* : Tension deviation target from set tension between certain stands downstream Value Δσf ^* : Target tension deviation value from the set tension between certain stands on the upstream side

Therefore, the tension between the stands in at least one of the stands upstream and downstream is adjusted so that Δσb ^* and Δσf ^* are obtained, the downstream is controlled by a roll speed control device, the upstream is controlled by a looper control device, and the upstream is controlled by a feedback system. Then, the downstream is dynamically controlled by a feedforward method (steps S282 and S283).

The same strip is rolled from the upstream to the downstream. First, when a sheet width deviation occurs at the intermediate stand at a certain point, the point to be rolled from now on is determined by the looper control device between the upstream stands. The tension is controlled by a feedback method so as not to be a point where the rolling has already occurred and a width variation has occurred. Since the plate width deviation occurred at this point, the roll speed control device between the stands on the downstream side controls the tension by the feedforward method when this point reaches the stand. In addition, the point to be rolled from now on is already controlled upstream before reaching the intermediate stand in a feedback manner,
Still, if there is a fluctuation in the plate width at the intermediate stand, it is controlled again by the feedforward dynamic control from this value.

Since control is performed by only one of the feedback method and the feedforward method in the first to sixteenth embodiments, control is performed only once for one point, and there is a possibility that the sheet width accuracy is defective. There is. Further, in the above-mentioned Embodiments 22 to 25, the input value for obtaining the control amount is the tension deviation, not the actual deviation actual at the stand, but is calculated by multiplying this tension deviation by each coefficient. The deviation obtained in this way includes an error, and the error may prevent the accuracy from being sufficiently maintained. Further, in the twenty-sixth embodiment, when controlling the downstream tension, a looper is used, so that the control amount is limited, and when the fluctuation of the tension becomes large, the control may be impossible.

According to the present invention, in the hot tandem rolling line, the width difference between the set value and the tension between the intermediate stands is measured by the intermediate width meter, and the actual width deviation is used. In order to compensate for this deviation, the tension between at least one of the upstream and downstream stands is dynamically controlled by a roll speed device on the downstream side and a looper control device on the upstream side. The control can function satisfactorily without restriction,
By applying the control of two times and the control of two systems, the target plate width can be secured and the plate width accuracy from the front end to the tail end of the material to be rolled can be improved.

Embodiment 29 FIG. FIG. 29 is a control block diagram showing a sheet width control method for a hot rolling mill according to another embodiment of the present invention. In the hot tandem rolling line, the tension between the stands deviates from the set value to generate a plate width deviation. In order to correct the width deviation measured by the intermediate width meter installed on the intermediate stand, in FIG. 29, at least upstream and downstream at A correction value of the tension between stands in one stand is obtained, and the upstream and downstream are dynamically controlled by a roll speed control device so as to be a value based on the calculated value.

The following equation shows that the product sheet width at the final exit side of the rolling mill is different from the target by the sheet width deviation ΔWm generated at the intermediate stand and the tension deviation Δσf from the set tension between at least one stand upstream. The deviation ΔW of the strip width is shown.

[0392]

[Equation 89]

Similarly, the following equation shows that the product sheet width at the final exit side of the rolling mill is obtained by the sheet width deviation ΔWm generated at the intermediate stand and the tension deviation Δσb from the set tension between at least one stand downstream. , The width deviation ΔW deviating from the target (step S291).

[0394]

[Equation 90]

In order to eliminate the plate width deviation ΔWm, the tension is changed from the set tension by Δσf ^{* according} to the following equation, and is controlled.
The target plate width can be secured.

[0396]

[Equation 91]

Here, GI: integral gain GP: proportional gain

Similarly, in order to eliminate the plate width deviation ΔWm, the target plate width can be secured by changing the set tension by Δσb ^* from the set tension according to the following equation.

[0399]

(Equation 92)

Here, ΔW: Sheet width fluctuation due to tension ΔWm: Actual sheet width fluctuation value measured by an intermediate sheet width meter dW / dσf: Sheet width fluctuation coefficient due to tension between upstream stands Δσf: Set tension between upstream stands DW / dσb: Coefficient of plate width variation due to tension between certain stands downstream Δσb: Tension variation from set tension between certain stands downstream Δσb ^* : Tension deviation target from set tension between certain stands downstream Value Δσf ^* : Target tension deviation value from the set tension between certain stands on the upstream side

Therefore, the tension between the stands in at least one of the stands upstream and downstream is adjusted so that Δσb ^* and Δσf ^* are obtained by the roll speed control device between the stands in both the upstream and downstream directions. Then, the downstream is dynamically controlled by the feedforward method (steps S292 and S293).

However, in roll speed control, FIG.
As shown in FIG. 8, when the two stands on the upstream and downstream sides are changed, if the following formula is not satisfied, the tension between the stands increases, and the strip is cut or a loop occurs, which causes trouble in rolling. .

Regarding each stand, the relationship between the outlet plate thickness and the outlet plate speed can be expressed by the following equation based on the principle of constant mass flow.

[0404]

[Equation 93]

Here, h _i : thickness of each stand exit side V _i : speed of each stand f _i : advance rate of each stand h _L : final stand exit side thickness V _L : final stand speed f _L : last stand advance rate

[0406] By keeping this mass flow balance constant, rolling between the stands is stabilized. The speed correction amounts between the upstream and downstream stands satisfying the above-mentioned tension are denoted by ΔVf and ΔVb, respectively. The speed correction values at the upstream side between the upstream stands f and the stand downstream from the downstream stand b are the above-mentioned mass flow constant. If each of the principles is not satisfied, even if the width deviation is eliminated by correcting the tension on the upstream side and the downstream side, it is impossible to control by interaction.

Therefore, the upstream and downstream speed correction values Vi
-1 * and Vi + 1 * are calculated by the upstream speed setting device and the downstream speed setting device, and must satisfy the following equations.

[0408]

[Equation 94]

[0409]

[Equation 95]

[0410] The same strip is rolled from upstream to downstream. When a width deviation at the intermediate stand occurs at a certain point, the roll speed control device between the upstream stands determines the point at which the strip is to be rolled. The tension is controlled by a feedback system so that the point does not become a point where the sheet width variation has already occurred due to rolling.
Since a plate width deviation has occurred at this point, the looper control device between the stands on the downstream side controls the tension by a feedforward method when this point reaches its own stand. In addition, the point to be rolled from now on is already controlled upstream before reaching the intermediate stand in a feedback manner,
Still, if there is a fluctuation in the plate width at the intermediate stand, it is controlled again by the feedforward dynamic control from this value.

Since the control is performed only by one of the feedback system and the feedforward system in the first to sixteenth embodiments, the control is performed only once for one point, and there is a possibility that the sheet width accuracy is defective. There is. In the above-described embodiments 22 to 25, the input value for obtaining the control amount is the tension deviation, not the actual deviation result at the stand, but is calculated by multiplying this tension deviation by each coefficient. The deviation obtained in this way includes an error, and the error may prevent the accuracy from being sufficiently maintained. Furthermore, in the twenty-sixth and twenty-eighth embodiments, when controlling the upstream and downstream tensions, the control amount is limited due to the use of the looper, and the control may not be possible if the tension variation becomes large.

[0412] According to the present invention, in the hot tandem rolling line, the plate width deviation caused by the deviation between the set value and the tension between the intermediate stands is measured by the intermediate plate width meter, and the actual width deviation is used. In order to compensate for this deviation, the tension between at least one of the upstream and downstream stands is dynamically controlled by a roll speed device, so that the tension cannot be controlled by the upstream feedback system and the downstream feedforward system. In consideration of the influence of downstream speed correction, the speed setting device realizes a control that stabilizes strip rolling, and performs two control operations for the same point,
By applying the control of the method, it is possible to secure the target plate width and improve the plate width accuracy from the front end to the tail end of the material to be rolled.

[0413]

The strip width control method for a hot rolling mill according to the present invention is a strip width control method for a hot tandem rolling mill, comprising: a tension detecting step for detecting a tension between upstream stands;
A feedforward dynamic correction step of calculating a correction value based on the output of the tension detection step, and dynamically correcting the tension in a downstream device in a feedforward manner based on the correction value. For this reason, the tension between the upstream stands and the correction value due to the deviation from the set value are dynamically controlled downstream by the feedforward method to secure the target sheet width and to secure the target sheet width from the front end to the tail end. Width accuracy can be improved.

[0414] The downstream device is a looper control device, and the feedforward dynamic correction step includes:
Based on the correction value, the looper controller corrects the tension. Therefore, in the hot tandem rolling line, the width difference due to the deviation between the set value and the tension between the upstream stands is reduced, and the tension between at least one stand downstream is dynamically reduced by a looper device in a feed-forward manner. , The target sheet width can be secured, and the sheet width accuracy from the leading end to the tail end of the material to be rolled can be improved.

[0415] The downstream device is a roll speed control device, and the feedforward dynamic correction step causes the roll speed control device to correct the tension based on the correction value. Therefore, in the hot tandem rolling line, the sheet width deviation caused by the deviation between the set value and the tension between the upstream stands is dynamically reduced by a feedforward method using at least one or more roll speeds at the downstream side. Since the control is performed, even if the tension fluctuation is large, the control is not disabled, and the target plate width can be secured, and the plate width accuracy from the front end to the tail end of the material to be rolled can be reliably improved.

In the tension detecting step, the tension between at least two stands upstream is detected, the downstream device is a looper control device, and the feed forward dynamic correction step is a correction value based on the tension between the two stands. Is calculated, and the looper controller corrects the tension based on the correction value. Therefore, in the hot tandem rolling line, the tension between the upstream stands and the sheet width deviation and the sheet thickness deviation due to the deviation between the set values and the tension between at least two downstream stands or more are fed by a looper device. In the forward method, the target width and thickness are controlled dynamically by simultaneously controlling the width and thickness accuracy from the front end to the tail end of the material to be rolled.

[0417] The tension detecting step detects the tension between at least two stands upstream, the downstream device is a roll speed control device, and the feedforward dynamic correction step corrects based on the tension between the two stands. The value is calculated, and the roll speed control device corrects the tension based on the correction value. Therefore, in a hot tandem rolling line, the sheet width deviation and the sheet thickness deviation caused by the deviation between the set value and the tension between the upstream stands, and the tension of at least two stands downstream are fed forward by the roll speed. , So that even if the tension fluctuation is large, the control is not impossible, and the speed setting device does not make the strip rolling unstable in consideration of the effect of the roll speed between the two stands. After the calculation, the control is performed by the roll speed control device, and at the same time, the target sheet width and the target sheet thickness can be secured to improve both the sheet width and the sheet thickness accuracy from the front end to the tail end of the material to be rolled.

[0418] Also, a strip width control method for a hot rolling mill according to another invention is a strip width control method for a hot tandem rolling mill, comprising: a tension detecting step for detecting a tension between downstream stands; Calculate the correction value based on the output of the detection step,
And a feedback dynamic correction step of causing the upstream device to dynamically correct the tension in a feedback manner based on the correction value. Therefore, the tension between the downstream stands is set value and the correction value due to the occurrence of the deviation is dynamically controlled upstream by a feedback method to secure the target plate width and to extend from the front end to the tail end of the material to be rolled. Can improve the width accuracy.

[0419] The upstream device is a looper control device, and the feedback dynamic correction step causes the looper control device to correct the tension based on the correction value. Therefore, in a hot tandem rolling line, a width difference caused by a deviation between a set value and a tension between downstream stands is reduced by a looper device at least in an upstream direction by a looper device by a feedback system using a feedback system. , The target sheet width can be secured and the sheet width accuracy from the front end to the tail end of the material to be rolled can be further improved.

[0420] The upstream device is a roll speed control device, and the feedback dynamic correction step includes:
The tension is corrected by the roll speed control device based on the correction value. Therefore, in the hot tandem rolling line, the sheet width deviation due to the deviation between the set value and the tension between the downstream stands is dynamically controlled at least at the roll speed of at least one stand upstream. Even if the fluctuation is large, control is not impossible, and the target sheet width can be secured to improve the sheet width accuracy from the front end to the tail end of the material to be rolled.

The tension detecting step detects the tension between at least two upstream stands, the upstream device is a looper control device, and the feedback dynamic correction step calculates a correction value based on the tension between the two stands. Calculate,
Based on the correction value, the looper controller corrects the tension. In the hot tandem rolling line, the tension between the downstream stands and the sheet width deviation and the thickness deviation due to the deviation of the set value are obtained. By controlling dynamically, the target sheet width and the target sheet thickness can be secured at the same time, and both the sheet width and the sheet width accuracy from the leading end to the tail end of the material to be rolled can be improved.

In the tension detecting step, the tension between at least two upstream stands is detected, the upstream device is a roll speed control device, and the feedback dynamic correction step is a correction value based on the tension between the two stands. Is calculated, and the roll speed control device corrects the tension based on the correction value. Therefore, in the hot tandem rolling line, the sheet width deviation and the sheet thickness deviation due to the deviation between the set value and the tension between the downstream stands are converted into a feedback system using the roll speed at least the tension of two stands or more upstream. And dynamic control, so that even if the tension fluctuation is large, it will not be impossible to control, and the speed setting device will calculate so as not to make the strip rolling unstable considering the effect of the roll speed between the two stands. Then, the control is performed by the roll speed control device, and at the same time, the target sheet width and the target sheet thickness are secured, and the sheet width and the sheet width accuracy from the leading end to the tail end of the material to be rolled can be both improved.

[0423] A strip width control method for a hot rolling mill according to another invention is a strip width control method for a hot tandem rolling mill, comprising: a strip width detecting step of detecting a strip width between upstream stands. , Calculate the correction value based on the output of the width detection step,
A feed-forward dynamic correction step of dynamically correcting tension in a feed-forward manner in a downstream device based on the correction value. Therefore, the correction value due to the deviation of the sheet width between the upstream stands and the set value is dynamically controlled downstream by the feedforward method to secure the target sheet width and tail from the leading end of the material to be rolled. The width accuracy at the edges can be improved.

[0424] The downstream device is a looper control device, and the feedforward dynamic correction step includes:
Based on the correction value, the looper controller corrects the tension. Therefore, in relation to rolling by a hot tandem rolling mill, in order to eliminate this deviation by using the actual width deviation measured by an intermediate width gauge installed between upstream stands, at least one downstream stand or more. By controlling the tension dynamically by a looper control device in a feed-forward manner, it is possible to provide more accurate sheet width control and improve the sheet width quality of a product.

The downstream device is a roll speed control device, and the feed forward dynamic correction step causes the roll speed control device to correct the tension based on the correction value. Therefore, regarding rolling by a hot tandem rolling mill, in order to eliminate this deviation by using the actual width deviation measured by the intermediate width meter installed between the upstream stands, at least the roll speed of at least one stand downstream is used. By performing dynamic control by the feed-forward method, control is not impossible even if the tension fluctuation is large, so that the above-mentioned drawbacks can be solved and the plate width accuracy can be further improved.

Further, a strip width control method for a hot rolling mill according to another invention is a strip width control method for a hot tandem rolling mill, wherein the strip width for detecting the strip width and the strip thickness between upstream stands is provided. A sheet thickness detection step, a feedforward dynamic correction step of calculating a correction value based on the output of the sheet width / plate thickness detection step, and dynamically correcting the tension in a downstream device in a feedforward manner based on the correction value. It has. Therefore, the width and thickness between the upstream stands are set values and the correction value caused by the deviation is dynamically controlled downstream by a feed-forward method to secure the target width and secure the target material width. It is possible to improve the width accuracy from the tip to the tail end.

[0427] The plate width / thickness detecting step detects the plate width / thickness between at least two stands upstream, the downstream device is a looper control device, and the feed forward dynamic correction step includes two stand positions. A correction value is calculated on the basis of the sheet width and the sheet thickness therebetween, and the looper controller corrects the tension based on the correction value. Therefore, in relation to rolling by a hot tandem rolling mill, in order to eliminate sheet width and sheet thickness deviations measured by an intermediate sheet width gauge and an intermediate sheet thickness gauge installed between upstream stands, at least between two stands downstream. The width and thickness accuracy can be improved at the same time by dynamically correcting the tension of the sheet by a feeder method using a looper.

In the sheet width / thickness detecting step, the sheet width / thickness between at least two stands on the upstream is detected, the downstream device is a roll speed control device, and the feed forward dynamic correction step is Board width between stands
A correction value is calculated based on the sheet thickness, and the roll speed control device corrects the tension based on the correction value. Therefore, in relation to rolling by a hot tandem rolling mill, at least two or more stands of rolls are provided at least downstream in order to eliminate sheet width and sheet thickness deviations measured by an intermediate sheet width gauge and an intermediate sheet thickness gauge installed between upstream stands. By dynamically controlling the speed in a feed-forward manner, even if the tension fluctuation is large, control becomes impossible, and the speed setting device becomes unstable in strip rolling in consideration of the effect of the roll speed between the two stands. Calculate so that it does not become, control is implemented by the roll speed control device,
The above disadvantages can be solved, and at the same time, the plate width and plate thickness accuracy can be further improved.

Further, a strip width control method for a hot rolling mill according to another invention is a strip width control method for a hot tandem rolling mill, comprising: a strip width detecting step for detecting a strip width between upstream stands. , Calculate the correction value based on the output of the width detection step,
And a feedback dynamic correction step of causing the upstream device to dynamically correct the tension in a feedback manner based on the correction value. Therefore, the correction value due to the deviation of the sheet width between the downstream stand and the set value is dynamically controlled upstream by a feedback method to secure the target sheet width and to secure the target sheet width from the front end to the tail end of the material to be rolled. Width accuracy can be improved.

The upstream device is a looper control device, and the feedback dynamic correction step causes the looper control device to correct the tension based on the correction value. Therefore, regarding the rolling by the hot tandem rolling mill, in order to eliminate the plate width deviation measured by the intermediate plate width meter installed between the downstream stands, at least the tension between at least one stand on the upstream side is fed back by a looper. By performing dynamic control, high-precision control can be provided, and plate width accuracy can be improved.

The upstream device is a roll speed control device, and the feedback dynamic correction step includes:
The tension is corrected by the roll speed control device based on the correction value. Therefore, regarding rolling by a hot tandem rolling mill,
In order to eliminate the plate width deviation measured by the intermediate plate width meter installed between the downstream stands, at least the roll speed of at least one stand at the upstream is dynamically controlled by a feedback method so that even if the tension fluctuation is large, It is not impossible to control, and the width accuracy can be improved by high-precision control.

[0432] A strip width control method for a hot rolling mill according to another invention is a strip width control method for a hot tandem rolling mill, wherein the strip width for detecting the strip width and the strip thickness between the upstream stands is provided. A thickness correction step, and a feedback dynamic correction step of calculating a correction value based on the output of the width / thickness detection step and dynamically correcting the tension in an upstream device based on the correction value in a feedback manner. ing. Therefore, the width and thickness between the downstream stands are set values and the correction value due to the deviation is dynamically controlled upstream by a feedback method to secure the target width and to secure the tip of the material to be rolled. It is possible to improve the width accuracy from the end to the tail end.

[0433] The plate width / thickness detecting step detects the plate width / thickness between at least two upstream stands. The upstream device is a looper control device. A correction value is calculated based on the sheet width and the sheet thickness, and the tension is corrected by the looper controller based on the correction values. Therefore, regarding the rolling by the hot tandem rolling mill, in order to eliminate the sheet width and sheet thickness deviation measured by the intermediate sheet width gauge and the intermediate sheet thickness gauge installed between the downstream stands, at least two or more stands upstream. By controlling the tension dynamically by a looper in a feedback manner, the above-mentioned drawbacks can be solved, and at the same time, the plate width and plate thickness accuracy can be further improved.

The sheet width / thickness detecting step detects the sheet width / thickness between at least two upstream stands, the upstream device is a roll speed control device, and the feedback dynamic correction step is two stand. A correction value is calculated based on the sheet width and the sheet thickness therebetween, and the tension is corrected by the roll speed control device based on the correction value. Therefore, in relation to rolling by a hot tandem rolling mill, at least two or more stands of rolls are provided at the upstream in order to eliminate sheet width and sheet thickness deviations measured by an intermediate sheet width gauge and an intermediate sheet thickness gauge installed between downstream stands. By dynamically controlling the speed by the feedback method, even if the tension fluctuation is large, it will not be impossible to control,
The speed setting device calculates the strip rolling so as not to become unstable in consideration of the effect of the roll speed between the two stands, and the control is performed by the roll speed control device. The width and thickness accuracy can be improved.

[0435] A strip width controlling method for a hot rolling mill according to another invention is a strip width controlling method for a hot tandem rolling mill, wherein a tension detecting step for detecting a tension between stands,
A correction value is calculated based on the output of the tension detection step, and a feedback dynamic correction step in which the upstream device dynamically corrects the tension in a feedback manner based on the correction value, and a correction value is calculated based on the output of the tension detection step. And a feedforward dynamic correction step of dynamically correcting the tension in a feedforward manner in a downstream device based on the correction value. for that reason,
The correction value due to the deviation of the tension between the intermediate stands from the set value is controlled by the feedback system for the upstream and the feedforward system for the downstream, and the accuracy defect is controlled by 2 for the same point. By applying the control of two times and the control of two systems, the target plate width can be secured and the plate width accuracy from the front end to the tail end of the material to be rolled can be improved.

The upstream device is a first looper control device. In the feedback dynamic correction step, the first looper control device corrects the tension based on the correction value, and the downstream device controls the second looper control device. The feed forward dynamic correction step causes the second looper control device to correct the tension based on the correction value. Therefore, in the hot tandem rolling line, the tension between the intermediate stands and the sheet width deviation caused by the deviation from the set value, the tension between at least one stand upstream and downstream, and the feedback method for the upstream. On the downstream side, the target width is secured by dynamically controlling the feed-forward method with a looper device and controlling the poor accuracy by controlling the same point twice and using two methods. Thus, the width accuracy of the rolled material from the front end to the tail end can be improved.

[0437] The upstream device is a roll speed control device, and the feedback dynamic correction step includes:
Based on the correction value, let the roll speed controller correct the tension,
The downstream device is a looper control device, and the feedforward dynamic correction step causes the looper control device to correct the tension based on the correction value. Therefore, in the hot tandem rolling line, the tension between the intermediate stands and the sheet width deviation due to the occurrence of deviation from the set value, the tension between at least one stand upstream and downstream, the roll speed device upstream, the downstream The looper control device dynamically controls the upstream by the feedback system and the downstream by the feedforward system. Even if the tension fluctuation is large, the feedback system at the upstream does not disable the control. By applying the control of two times and the control of two systems, the target plate width can be secured and the plate width accuracy from the front end to the tail end of the material to be rolled can be improved.

[0438] The upstream device is a looper control device, and the feedback dynamic correction step causes the looper control device to correct the tension based on the correction value. The downstream device is a roll speed control device. The forward dynamic correction step causes the roll speed controller to correct the tension based on the correction value. Therefore, in the hot tandem rolling line, the tension between the intermediate stands and the sheet width deviation due to the deviation from the set value, the tension between at least one stand upstream and downstream, the roll speed device downstream, the upstream The looper controller dynamically controls the upstream with the feedback system and the downstream with the feedforward system. And the width accuracy from the front end to the tail end of the material to be rolled can be improved.

The upstream device is a first roll speed control device, and the feedback dynamic correction step causes the first roll speed control device to correct the tension based on the correction value, and the downstream device performs The second roll speed control device, wherein the feedforward dynamic correction step causes the second roll speed control device to correct the tension based on the correction value. Therefore, in the hot tandem rolling line, the sheet width deviation caused by the deviation between the set value and the tension between the intermediate stands is dynamically controlled by the roll speed device at least the tension between at least one stand upstream and downstream. As a result, control cannot be disabled by the upstream feedback system and the downstream feedforward system, and the control of the strip rolling is stabilized by the speed setting device in consideration of the influence of the upstream and downstream speed correction. However, by applying the control of two methods to the same point twice, it is possible to secure the target sheet width and improve the sheet width accuracy from the leading end to the tail end of the material to be rolled.

[0440] Further, a strip width control method for a hot rolling mill according to another invention is a strip width control method for a hot tandem rolling mill, comprising: a strip width detecting step of detecting a strip width between stands;
A correction value is calculated based on the output of the sheet width detection step, and a feedback dynamic correction step in which an upstream device dynamically corrects the tension in a feedback manner based on the correction value, and a correction value based on the output of the sheet width detection step. And a feed-forward dynamic correction step of dynamically correcting the tension in a downstream device in a feed-forward manner based on the correction value. for that reason,
The correction value due to the deviation of the plate width between the intermediate stands and the set value is controlled by the feedback method for the upstream and the feedforward method for the downstream, and the accuracy defect is controlled for the same point. By applying the control of two times and the control of two systems, the target plate width can be secured and the plate width accuracy from the leading end to the tail end of the material to be rolled can be improved.

The upstream device is a first looper control device. In the feedback dynamic correction step, the first looper control device corrects the tension based on the correction value, and the downstream device controls the second looper control device. The feed forward dynamic correction step causes the second looper control device to correct the tension based on the correction value. Therefore, in the hot tandem rolling line, the tension between the intermediate stands is set value and the width deviation due to the occurrence of deviation is measured with the intermediate width meter, and the actual width deviation is used to compensate for this deviation. By using a looper device to dynamically control the tension between at least one stand upstream and downstream by a looper device twice dynamically for one point in a feedback system upstream and a feed forward system downstream, and controlling the same point twice. By applying the two types of control,
The target plate width can be secured to improve the plate width accuracy from the leading end to the tail end of the material to be rolled.

The upstream device is a roll speed control device, and the feedback dynamic correction step includes:
Based on the correction value, let the roll speed controller correct the tension,
The downstream device is a looper control device, and the feedforward dynamic correction step causes the looper control device to correct the tension based on the correction value. Therefore, in the hot tandem rolling line, the tension between the intermediate stands is measured with the intermediate width meter due to the deviation between the set value and the set value, and the actual width deviation is used to compensate for this deviation. To
The upstream and downstream tensions between at least one stand are dynamically controlled by a roll speed device on the upstream side and a looper control device on the downstream side, so that even if the plate width fluctuation is large, the upstream feedback control can function satisfactorily without restriction. In addition, it is possible to secure the target plate width and improve the plate width accuracy from the front end to the tail end of the material to be rolled.

The upstream device is a looper control device. The feedback dynamic correction step causes the looper control device to correct the tension based on the correction value. The downstream device is a roll speed control device. The forward dynamic correction step causes the roll speed controller to correct the tension based on the correction value. Therefore, in the hot tandem rolling line, the tension between the intermediate stands is measured with the intermediate width meter due to the deviation between the set value and the set value, and the actual width deviation is used to compensate for this deviation. To
The tension between at least one stand upstream and downstream is dynamically controlled by a roll speed device on the downstream side and a looper control device on the upstream side. Even if the sheet width fluctuation is large, the downstream feed forward control is fully functioning without any restriction. It is possible to secure the target sheet width and improve the sheet width accuracy from the leading end to the tail end of the material to be rolled by applying the control of two methods to the same point twice.

Also, the upstream device is a first roll speed control device, and the feedback dynamic correction step causes the first roll speed control device to correct the tension based on the correction value, and the downstream device performs The second roll speed control device, wherein the feedforward dynamic correction step causes the second roll speed control device to correct the tension based on the correction value. Therefore, in the hot tandem rolling line, the tension between the intermediate stands is measured with the intermediate width meter due to the deviation between the set value and the set value, and the actual width deviation is used to compensate for this deviation. In addition, the tension between at least one stand upstream and downstream is dynamically controlled by a roll speed device so that the upstream feedback system and the downstream feedforward system do not become uncontrollable. In consideration of this, the speed setting device realizes a control that stabilizes the rolling of the strip, and the control is performed twice for the same point and the control of the two systems is applied to secure the target strip width and perform rolling. It is possible to improve the width accuracy of the material from the front end to the tail end of the material.

[0445] Further, a setup control function having an advanced rate learning function using a stand-up looper rise result at the time of strip biting at each rolling stand is further provided. Therefore, since the learning correction can be performed based on the achievement of the advanced rate, the advanced rate setting of the setup control is performed with high accuracy. As a result, the speed balance between the stands is maintained, and the fluctuation of the tension at the front end portion is suppressed, so that the accuracy of the width of the leading end portion can be improved.

Also, when the stand is engaged with the strip, the speed correction amount relating to the speed balance between the stand and the next stand is calculated from the plate speed error measured by the plate speed meter installed on the exit side of the stand. A control function for dynamically correcting only the roll speed is further provided. Therefore, by correcting the speed of the next stand with respect to the biting stand, the speed imbalance factor generated in the biting stand is reflected in advance on the speed of the next stand, thereby ensuring the speed balance. As a result, tension fluctuation between stands can be reduced, and plate width accuracy can be improved.

[0447] Further, a function for dynamically controlling the tension until the looper between stands rises when the strip of the next stand is engaged with the strip is further provided. Therefore, by stripping the strip into both the stand and the next stand and dynamically controlling the tension on the strip tip until the looper between stands rises, the variation in the width of the strip due to the variation in the tension of the strip tip can be reduced. And the width accuracy can be improved.

Also, the tension until the looper between stands rises when the strip of the next stand is engaged is dynamically controlled, and after the looper between stands rises, a learning function using the actual tension detected by the looper between stands is maintained. I do. Therefore, when the strip tip bites into the corresponding stand, and then the next stand is bitten, the tension on the strip tip portion until the looper between stands rises is dynamically controlled, by using a learning coefficient for this dynamic control amount. In addition, the accuracy of the tension at the leading end portion of the strip with respect to the set tension value is improved, the amount of fluctuation in the tension from the transition to the looper control between stands can be reduced, and the plate width accuracy can be improved.

[0449] Further, when the stand is engaged with the strip, a speed correction amount in consideration of the speed ratio with the upstream stand is calculated from the plate speed error measured by the plate speed meter installed on the exit side of the stand, and the upstream stand is adjusted. A control function for dynamically correcting all roll speeds is further provided.
Therefore, by performing speed correction on all the stands upstream from the biting stand, the speed balance of each stand is maintained, and stable rolling can be performed. As a result, tension fluctuation between stands can be reduced,
Plate width accuracy can be improved.

[Brief description of the drawings]

FIG. 1 is a control block diagram illustrating a sheet width control method for a hot rolling mill according to an embodiment of the present invention.

FIG. 2 is a control block diagram showing a sheet width control method for a hot rolling mill according to another embodiment of the present invention.

FIG. 3 is a control block diagram showing a sheet width control method for a hot rolling mill according to another embodiment of the present invention.

FIG. 4 is a control block diagram showing a sheet width control method for a hot rolling mill according to another embodiment of the present invention.

FIG. 5 is a control block diagram showing a strip width control method for a hot rolling mill according to another embodiment of the present invention.

FIG. 6 is a control block diagram showing a strip width control method for a hot rolling mill according to another embodiment of the present invention.

FIG. 7 is a control block diagram showing a sheet width control method for a hot rolling mill according to another embodiment of the present invention.

FIG. 8 is a control block diagram showing a sheet width control method for a hot rolling mill according to another embodiment of the present invention.

FIG. 9 is a control block diagram showing a sheet width control method for a hot rolling mill according to another embodiment of the present invention.

FIG. 10 is a control block diagram showing a sheet width control method for a hot rolling mill according to another embodiment of the present invention.

FIG. 11 is a control block diagram showing a sheet width control method for a hot rolling mill according to another embodiment of the present invention.

FIG. 12 is a control block diagram illustrating a sheet width control method for a hot rolling mill according to another embodiment of the present invention.

FIG. 13 is a control block diagram showing a sheet width control method for a hot rolling mill according to another embodiment of the present invention.

FIG. 14 is a control block diagram illustrating a sheet width control method for a hot rolling mill according to another embodiment of the present invention.

FIG. 15 is a control block diagram showing a strip width control method for a hot rolling mill according to another embodiment of the present invention.

FIG. 16 is a control block diagram showing a sheet width control method for a hot rolling mill according to another embodiment of the present invention.

FIG. 17 is a diagram showing a state during rolling showing a sheet width control method for a hot rolling mill according to another embodiment of the present invention.

FIG. 18 is a view relating to a modification of a biting stand and a next stand using a speedometer 6 showing a sheet width control method of a hot rolling mill according to another embodiment of the present invention.

FIG. 19 is a view showing a control flow showing a sheet width control method of a hot rolling mill according to another embodiment of the present invention.

FIG. 20 is a diagram showing a control flow showing a sheet width control method for a hot rolling mill according to another embodiment of the present invention.

FIG. 21 is a control block diagram illustrating a sheet width control method for a hot rolling mill according to another embodiment of the present invention.

FIG. 22 is a control block diagram illustrating a sheet width control method for a hot rolling mill according to another embodiment of the present invention.

FIG. 23 is a control block diagram showing a sheet width control method for a hot rolling mill according to another embodiment of the present invention.

FIG. 24 is a control block diagram showing a strip width control method for a hot rolling mill according to another embodiment of the present invention.

FIG. 25 is a control block diagram showing a sheet width control method for a hot rolling mill according to another embodiment of the present invention.

FIG. 26 is a control block diagram showing a sheet width control method for a hot rolling mill according to another embodiment of the present invention.

FIG. 27 is a control block diagram showing a sheet width control method for a hot rolling mill according to another embodiment of the present invention.

FIG. 28 is a control block diagram showing a sheet width control method for a hot rolling mill according to another embodiment of the present invention.

FIG. 29 is a control block diagram showing a strip width control method for a hot rolling mill according to another embodiment of the present invention.

[Explanation of symbols]

S11, S51 Tension detection step, S12, S13
Feed forward dynamic correction step, S5
2, S53 Feedback dynamic correction step, S91 Sheet width detection step, S111 Sheet width / sheet thickness detection step.

Claims (37)

[Claims] 1. A method for controlling a width of a hot tandem rolling mill, comprising the steps of: detecting a tension between upstream stands; calculating a correction value based on an output of the tension detection step; A feedforward dynamic correction step of dynamically correcting tension in a downstream apparatus based on the value in a feedforward manner. 2. The apparatus of claim 2, wherein the downstream device is a looper control device, and wherein the feedforward dynamic correction step comprises:
3. The method according to claim 1, wherein the tension is corrected by the looper control device based on the correction value. 3. The apparatus of claim 1, wherein the downstream device is a roll speed control device, and wherein the feedforward dynamic correction step comprises:
2. The method according to claim 1, wherein the roll speed controller corrects the tension based on the correction value. 4. The tension detection step detects a tension between at least two upstream stands, the downstream device is a looper control device, and the feedforward dynamic correction step includes:
2. The width control of a hot rolling mill according to claim 1, wherein the correction value is calculated based on the tension between the two stands, and the looper control device corrects the tension based on the correction value. Method. 5. The tension detection step detects a tension between at least two upstream stands, the downstream device is a roll speed control device, and the feedforward dynamic correction step includes:
2. The strip width of a hot rolling mill according to claim 1, wherein the correction value is calculated based on the tension between the two stands, and the roll speed control device corrects the tension based on the correction value. Control method. 6. A method for controlling a width of a hot tandem rolling mill, comprising: a tension detecting step of detecting a tension between downstream stands; and a correction value calculated based on an output of the tension detecting step. A feedback dynamic correction step of dynamically correcting the tension in a feedback manner in an upstream apparatus based on the value. 7. The apparatus according to claim 6, wherein the upstream device is a looper control device, and wherein the feedback dynamic correction step causes the looper control device to correct the tension based on the correction value. A method for controlling the width of a hot rolling mill. 8. The apparatus according to claim 6, wherein the upstream device is a roll speed control device, and wherein the feedback dynamic correction step causes the roll speed control device to correct the tension based on the correction value. A method for controlling a sheet width of a hot rolling mill according to the above. 9. The tension detecting step detects a tension between at least two upstream stands, the upstream device is a looper control device, and the feedback dynamic correction step is based on the tension between the two stands. 7. The method according to claim 6, wherein the correction value is calculated, and the tension is corrected by the looper control device based on the correction value. 10. The tension detecting step detects a tension between at least two upstream stands, the upstream device is a roll speed control device, and the feedback dynamic correcting step detects a tension between the two stands. 7. The method according to claim 6, wherein the correction value is calculated based on the correction value, and the roll speed control device corrects the tension based on the correction value. 11. A method for controlling a sheet width of a hot tandem rolling mill, comprising: a sheet width detecting step for detecting a sheet width between upstream stands; and a correction value calculated based on an output of the sheet width detecting step. And a feedforward dynamic correction step of dynamically correcting tension in a downstream device based on the correction value in a feedforward manner. 12. The apparatus of claim 12, wherein the downstream device is a looper control device, and wherein the feedforward dynamic correction step comprises:
The method according to claim 11, wherein the tension is corrected by the looper control device based on the correction value. 13. The downstream device is a roll speed controller, wherein the feedforward dynamic correction step comprises:
The method according to claim 11, wherein the tension is corrected by the roll speed control device based on the correction value. 14. A sheet width control method for a hot tandem rolling mill, comprising: a sheet width / sheet thickness detecting step for detecting a sheet width / sheet thickness between upstream stands; and a sheet width / sheet thickness detecting step. A feed-forward dynamic correction step of calculating a correction value based on the output and dynamically correcting tension in a downstream device in a feed-forward manner based on the correction value. Width control method. 15. The sheet width / thickness detecting step detects the sheet width / thickness between at least two upstream stands, the downstream device is a looper control device, and the feedforward dynamic correcting step includes: ,
15. The hot rolling mill according to claim 14, wherein the correction value is calculated based on a sheet width and a sheet thickness between the two stands, and the looper control device corrects the tension based on the correction value. Sheet width control method. 16. The sheet width / thickness detecting step detects a sheet width / thickness between at least two upstream stands, the downstream device is a roll speed control device, and the feed forward dynamic correcting step. Is
15. The hot rolling according to claim 14, wherein the correction value is calculated based on the sheet width and the sheet thickness between the two stands, and the tension is corrected by the roll speed control device based on the correction value. Machine width control method. 17. A method for controlling a sheet width of a hot tandem rolling mill, comprising: a sheet width detecting step for detecting a sheet width between upstream stands; and a correction value calculated based on an output of the sheet width detecting step. And a feedback dynamic correction step of dynamically correcting the tension in an upstream apparatus based on the correction value in a feedback manner. 18. The apparatus according to claim 17, wherein the upstream device is a looper control device, and wherein the feedback dynamic correction step causes the looper control device to correct the tension based on the correction value. A method for controlling the width of a hot rolling mill. 19. The apparatus according to claim 17, wherein the upstream device is a roll speed control device, and wherein the feedback dynamic correction step causes the roll speed control device to correct the tension based on the correction value. A method for controlling a sheet width of a hot rolling mill according to the above. 20. A sheet width control method for a hot tandem rolling mill, comprising: a sheet width / sheet thickness detecting step of detecting a sheet width / sheet thickness between upstream stands; and a sheet width / sheet thickness detecting step. A feedback dynamic correction step of calculating a correction value based on the output and dynamically correcting the tension in an upstream apparatus based on the correction value in a feedback manner. Method. 21. The sheet width / thickness detecting step detects a sheet width / thickness between at least two upstream stands, the upstream device is a looper control device, and the feedback dynamic correcting step includes: Calculate the correction value based on the plate width and plate thickness between the two stands,
21. The method according to claim 20, wherein the tension is corrected by the looper controller based on the correction value. 22. The sheet width / thickness detecting step detects a sheet width / thickness between at least two upstream stands, the upstream device is a roll speed control device, and the feedback dynamic correcting step is Calculating the correction value based on the plate width and plate thickness between the two stands,
21. The method according to claim 20, wherein the tension is corrected by the roll speed control device based on the correction value. 23. A method of controlling a width of a hot tandem rolling mill, comprising: a tension detecting step for detecting a tension between stands; a correction value based on an output of the tension detecting step; A feedback dynamic correction step for dynamically correcting the tension in the upstream device based on the feedback method, a correction value is calculated based on the output of the tension detection step, and the downstream device is fed-forward based on the correction value. A feed-forward dynamic correction step of dynamically correcting the tension. 24. The upstream looper control device, wherein the feedback dynamic correction step causes the first looper control device to correct the tension based on the correction value; The apparatus is a second looper controller, wherein the feedforward dynamic correction step comprises:
24. The method according to claim 23, wherein the second looper control device corrects the tension based on the correction value. 25. The upstream device is a roll speed control device, wherein the feedback dynamic correction step causes the roll speed control device to correct the tension based on the correction value, and the downstream device includes a looper. A control device, wherein the feedforward dynamic correction step comprises:
24. The method according to claim 23, wherein the tension is corrected by the looper control device based on the correction value. 26. The apparatus according to claim 26, wherein the upstream device is a looper control device, wherein the feedback dynamic correction step causes the looper control device to correct the tension based on the correction value; The feedforward dynamic modification step comprises:
24. The method according to claim 23, wherein the tension is corrected by the roll speed control device based on the correction value. 27. The apparatus according to claim 27, wherein the upstream device is a first roll speed control device, and wherein the feedback dynamic correction step causes the first roll speed control device to correct the tension based on the correction value; The downstream device is a second roll speed control device, wherein the feedforward dynamic correction step comprises:
24. The method according to claim 23, wherein the second roll speed control device corrects the tension based on the correction value. 28. A sheet width control method for a hot tandem rolling mill, comprising: a sheet width detecting step of detecting a sheet width between stands; and a correction value calculated based on an output of the sheet width detecting step. A feedback dynamic correction step of dynamically correcting the tension in a feedback manner to an upstream device based on the correction value, and a correction value is calculated based on the output of the plate width detection step, and a downstream device is calculated based on the correction value. A feed-forward dynamic correction step of dynamically correcting tension by a feed-forward method. 29. The upstream device is a first looper control device, wherein the feedback dynamic correction step causes the first looper control device to correct the tension based on the correction value; The apparatus is a second looper controller, wherein the feedforward dynamic correction step comprises:
29. The method according to claim 28, wherein the second looper controller corrects the tension based on the correction value. 30. The upstream device is a roll speed control device, wherein the feedback dynamic correction step causes the roll speed control device to correct the tension based on the correction value, and the downstream device includes a looper. A control device, wherein the feedforward dynamic correction step comprises:
29. The method according to claim 28, wherein the tension is corrected by the looper control device based on the correction value. 31. The upstream device is a looper control device, the feedback dynamic correction step causes the looper control device to correct the tension based on the correction value, and the downstream device controls a roll speed control. The feedforward dynamic modification step comprises:
The method according to claim 28, wherein the tension is corrected by the roll speed control device based on the correction value. 32. The upstream device is a first roll speed control device, wherein the feedback dynamic correction step causes the first roll speed control device to correct the tension based on the correction value; The downstream device is a second roll speed control device, wherein the feedforward dynamic correction step comprises:
29. The method according to claim 28, wherein the second roll speed control device corrects the tension based on the correction value. 33. The apparatus according to claim 1, further comprising a set-up control function having an advanced rate learning function using a stand-up looper rise result at the time of strip biting at each rolling stand. The method for controlling the width of a hot rolling mill. 34. When the strip is bitten by the stand,
A control function for calculating a speed correction amount relating to a speed balance between the stand and the next stand from a plate speed error measured by a plate speed meter installed on the exit side of the stand, and dynamically correcting the roll speed of only the next stand. The method according to any one of claims 1 to 33, further comprising: 35. The hot rolling mill according to claim 1, further comprising a function of dynamically controlling the tension until the looper between stands rises when the strip of the next stand bites in the strip. Sheet width control method. 36. Dynamic control of the tension until the looper between stands rises when the strip of the next stand bites, and after the looper between stands rises,
36. A learning function using a tension result detected by the looper between stands is held.
The method for controlling a sheet width of a hot rolling mill according to any one of the above items. 37. When the stand is engaged with the strip,
A control function for calculating the speed correction amount in consideration of the speed ratio with the upstream stand from the plate speed error measured by the plate speed meter installed on the exit side of the stand, and dynamically correcting the roll speed of all the upstream stands. 35. The method according to claim 1, further comprising:
The method for controlling a sheet width of a hot rolling mill according to any one of the above items.