JP2021016889A - Meandering control method of hot-rolled steel strip, meandering control device, and hot-rolling equipment - Google Patents

Meandering control method of hot-rolled steel strip, meandering control device, and hot-rolling equipment Download PDF

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JP2021016889A
JP2021016889A JP2019134682A JP2019134682A JP2021016889A JP 2021016889 A JP2021016889 A JP 2021016889A JP 2019134682 A JP2019134682 A JP 2019134682A JP 2019134682 A JP2019134682 A JP 2019134682A JP 2021016889 A JP2021016889 A JP 2021016889A
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rolling mill
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meandering
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JP7078020B2 (en
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英仁 山口
Hidehito Yamaguchi
英仁 山口
寛人 後藤
Hiroto Goto
寛人 後藤
龍裕 須江
Tatsuhiro Sue
龍裕 須江
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JFE Steel Corp
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Abstract

To provide a meandering control method of a hot-rolled steel strip, a meandering control device, and a hot-rolling facility that allow stable control of meandering behavior by properly setting a control target value, in controlling the meandering of a hot-rolled steel strip.SOLUTION: In a meandering control method of a hot-rolled steel strip, in a leveling control computing step (step S3), a target value of a roll gap difference between an operation side and a drive side in a control target rolling mill F7 is calculated such that: a meandering amount of a steel strip 10 becomes 0 mm, and a difference load of the rolling mill F7 becomes a difference load of the time when a tail end part 10a passes through a rolling mill F6, in a first control section A where the tail end part 10a of the steel strip 10 passes through the rolling mill F6 and then passes through a meandering amount measuring device 5; and a difference load of the rolling mill F7 becomes a difference load of the time when the tail end part 10a passes through the meandering amount measuring device 5, in a second control section B where the tail end part 10a passes through the meandering amount measuring device 5 and then passes through the rolling mill F7.SELECTED DRAWING: Figure 2

Description

本発明は、熱間圧延鋼帯の蛇行制御方法、蛇行制御装置及び熱間圧延設備に関する。 The present invention relates to a method for controlling meandering of hot-rolled steel strips, a meandering control device, and hot-rolling equipment.

一般に、熱間圧延鋼帯の製造ライン（ホットストリップミル）では、加熱されたスラブが粗圧延工程や仕上圧延工程などの製造工程を経て、所定の板幅及び板厚の鋼板が製造される。
仕上圧延工程では、図６に示すように、複数台（例えば７台）の圧延機Ｆ１〜Ｆ７からなる仕上圧延設備１で熱間圧延鋼帯（以下、単に鋼帯という）１０が同時に仕上圧延されるタンデム圧延を行い、所定の板厚の鋼板を製造する。 Generally, in a hot-rolled steel strip manufacturing line (hot strip mill), a heated slab undergoes a manufacturing process such as a rough rolling step and a finish rolling step to manufacture a steel plate having a predetermined plate width and thickness.
In the finish rolling process, as shown in FIG. 6, hot-rolled steel strips (hereinafter, simply referred to as steel strips) 10 are simultaneously finished rolled in a finish rolling facility 1 composed of a plurality of (for example, 7) rolling mills F1 to F7. The tandem rolling is performed to produce a steel plate having a predetermined thickness.

タンデム圧延では、図７に示すように、鋼帯１０の幅方向の板厚分布、鋼帯１０の幅方向の温度差、及び鋼帯１０の幅方向の曲がりによって、鋼帯１０が幅方向に移動する蛇行と呼ばれる現象が生じることがある。各圧延機Ｆ１〜Ｆ７の幅方向（鋼帯１０の幅方向と同じ方向）の中心ＣＬ１から鋼帯１０の幅方向の中心ＣＬ２までの距離を蛇行量δと呼ぶ。ここでは、鋼帯１０が、各圧延機Ｆ１〜Ｆ７の操作側に蛇行している場合を「＋」とし、各圧延機Ｆ１〜Ｆ７の駆動側に蛇行している場合を「−」とする。各圧延機Ｆ１〜Ｆ７の駆動側とは、搬送ロール（図示せず）のモータ（図示せず）に接続されている側を表し、各圧延機Ｆ１〜Ｆ７の操作側とは、駆動側と幅方向の反対側を表す。なお、図６及び図７における矢印は、圧延時における鋼帯１０の進行方向を示している。 In tandem rolling, as shown in FIG. 7, the steel strip 10 is bent in the width direction due to the thickness distribution in the width direction of the steel strip 10, the temperature difference in the width direction of the steel strip 10, and the bending in the width direction of the steel strip 10. A phenomenon called moving serpentine may occur. The distance from the center CL1 in the width direction of the rolling mills F1 to F7 (the same direction as the width direction of the steel strip 10) to the center CL2 in the width direction of the steel strip 10 is called the meandering amount δ. Here, the case where the steel strip 10 meanders to the operation side of each rolling mill F1 to F7 is defined as "+", and the case where the steel strip 10 meanders to the driving side of each rolling mill F1 to F7 is defined as "-". .. The drive side of each rolling mill F1 to F7 represents the side connected to the motor (not shown) of the transfer roll (not shown), and the operation side of each rolling mill F1 to F7 is the drive side. Represents the opposite side in the width direction. The arrows in FIGS. 6 and 7 indicate the traveling direction of the steel strip 10 during rolling.

ここで、鋼帯１０の尾端部１０ａの蛇行が大きくなった場合、鋼帯１０を幅方向に拘束するためのガイドと接触して、鋼帯１０が折れ込み、その状態で圧延されることで絞りと呼ばれるトラブルが生じることがある。絞りが発生すると、鋼帯１０を圧延する各圧延機Ｆ１〜Ｆ７のワークロール１ａ（図６参照）に疵が入りロール交換が必要になる。ロール交換のために一時的に操業を停止する必要があり、絞りが頻繁に発生する場合には、大きなダウンタイムとなる。そのため、鋼帯１０の蛇行を低減し、絞りの発生を抑制することは熱間圧延鋼帯のタンデム圧延では重要な課題となっている。 Here, when the meandering of the tail end portion 10a of the steel strip 10 becomes large, the steel strip 10 comes into contact with a guide for restraining the steel strip 10 in the width direction, and the steel strip 10 is folded and rolled in that state. A trouble called squeezing may occur. When drawing occurs, the work rolls 1a (see FIG. 6) of the rolling mills F1 to F7 for rolling the steel strip 10 are flawed and the rolls need to be replaced. It is necessary to temporarily stop the operation to replace the roll, and if the throttle is frequently squeezed, the downtime will be large. Therefore, reducing the meandering of the steel strip 10 and suppressing the occurrence of drawing is an important issue in tandem rolling of the hot-rolled steel strip.

鋼帯の蛇行を防止する方法の一つとして、圧延機のレベリング量を変更する方法がある。レベリング量とは、圧延機の操作側と駆動側のロールギャップの開度差のことである。ここでは、操作側のロールギャップの開度が大きい場合を「＋」、駆動側のロールギャップの開度が大きい場合を「−」とする。
例えば、圧延中に圧延機のレベリング量を＋側に変更すると、操作側より駆動側の圧下量が相対的に大きくなるため、操作側よりも駆動側の鋼帯が長くなり、圧延機出側では鋼帯は操作側に蛇行する。逆に、圧延中に圧延機のレベリング量を−側に変更すると、駆動側より操作側の圧下量が相対的に大きくなるため、駆動側よりも操作側の鋼帯が長くなり、圧延機出側では鋼帯は駆動側に蛇行する。 One of the methods for preventing the meandering of the steel strip is to change the leveling amount of the rolling mill. The leveling amount is the difference in the opening degree of the roll gap between the operation side and the drive side of the rolling mill. Here, the case where the opening degree of the roll gap on the operation side is large is "+", and the case where the opening degree of the roll gap on the drive side is large is "-".
For example, if the leveling amount of the rolling mill is changed to the + side during rolling, the rolling reduction amount on the drive side is relatively larger than that on the operation side, so that the steel strip on the drive side is longer than that on the operation side, and the rolling mill exit side. Then the steel strip meanders to the operation side. On the contrary, if the leveling amount of the rolling mill is changed to the-side during rolling, the rolling reduction amount on the operation side is relatively larger than that on the drive side. On the side, the steel strip meanders to the drive side.

従来にあっては、このレベリング量を変更することにより鋼帯の蛇行を防止するものとして、例えば、特許文献１及び特許文献２に示すものが提案されている。
特許文献１に示す熱間仕上圧延における鋼板尾端蛇行制御方法は、タンデム圧延において、蛇行検出装置をスタンド間ほぼ中央に設置し、蛇行制御を行い、圧延材尾端が蛇行検出装置通過後は、差荷重方式にて蛇行制御を行うことにより高応答かつ安定した制御を達成すると共に、低温材でもセンサ方式蛇行制御を可能とするものである。 Conventionally, as a method for preventing meandering of a steel strip by changing the leveling amount, for example, those shown in Patent Document 1 and Patent Document 2 have been proposed.
The method for controlling meandering at the tail end of a steel plate in hot finish rolling shown in Patent Document 1 is that in tandem rolling, a meandering detection device is installed substantially in the center between stands to control meandering, and after the tail end of the rolled material passes through the meandering detection device. By performing meandering control by the differential load method, high response and stable control are achieved, and sensor method meandering control is possible even with low temperature materials.

また、特許文献２に示す被圧延材の蛇行制御方法は、圧延スタンドＦ５を被圧延材の尾端が通過すると、第１の制御ゲインよりも低い第２の制御ゲインでフィードバック制御を行って「センサ方式蛇行制御」を実施する。また、圧延スタンドＦ６を被圧延材の尾端が通過すると、第１の制御ゲインでフィードバック制御を行って「センサ方式蛇行制御」を実施すると共に、第３の制御ゲインよりも低い第４の制御ゲインでフィードバック制御を行って「差荷重方式蛇行制御」を実施する。更に、蛇行量検出センサを被圧延材の尾端が通過すると、「センサ方式蛇行制御」を終了すると共に、第３の制御ゲインでフィードバック制御を行って「差荷重方式蛇行制御」を実施する。また、圧延スタンドＦ７を被圧延材の尾端が通過すると、「差荷重方式蛇行制御」を終了するものである。 Further, in the meandering control method of the material to be rolled shown in Patent Document 2, when the tail end of the material to be rolled passes through the rolling stand F5, feedback control is performed with a second control gain lower than the first control gain. "Sensor method meander control" is implemented. Further, when the tail end of the material to be rolled passes through the rolling stand F6, feedback control is performed with the first control gain to perform "sensor type meandering control", and a fourth control lower than the third control gain is performed. Feedback control is performed by the gain, and "difference load method meandering control" is performed. Further, when the tail end of the material to be rolled passes through the meandering amount detection sensor, the "sensor type meandering control" is terminated, and the feedback control is performed with the third control gain to perform the "differential load type meandering control". Further, when the tail end of the material to be rolled passes through the rolling stand F7, the "differential load method meandering control" is terminated.

特開平７−１４４２１１号公報JP-A-7-144211 特開２０１３−２１２５２３号公報Japanese Unexamined Patent Publication No. 2013-212523

しかしながら、これら従来の特許文献１に示す熱間仕上圧延における鋼板尾端蛇行制御方法及び特許文献２に示す被圧延材の蛇行制御方法にあっては、以下の問題点があった。
即ち、特許文献１に示す熱間仕上圧延における鋼板尾端蛇行制御方法の場合、圧延材尾端が蛇行検出装置通過前は蛇行検出装置により蛇行を検出し、蛇行制御に最適な制御量を算出して蛇行を制御するが、この制御における制御量の目標値が定かではない。また、圧延材尾端が蛇行検出装置通過後はロードセルによって検出される差荷重を基にしてロールチョックの最適な圧下量を算出するが、この制御における圧下量の目標値が定かではない。 However, the conventional method for controlling meandering of the tail end of a steel sheet in hot finish rolling shown in Patent Document 1 and the method for controlling meandering of a material to be rolled shown in Patent Document 2 have the following problems.
That is, in the case of the steel plate tail end meander control method in hot finish rolling shown in Patent Document 1, meandering is detected by the meandering detection device before the rolled material tail end passes through the meandering detection device, and the optimum control amount for meandering control is calculated. The meandering is controlled, but the target value of the control amount in this control is uncertain. Further, after the tail end of the rolled material passes through the meandering detection device, the optimum reduction amount of the roll chock is calculated based on the differential load detected by the load cell, but the target value of the reduction amount in this control is not clear.

また、特許文献２に示す被圧延材の蛇行制御方法の場合にあっても、「センサ方式蛇行制御」の実施及び「差荷重方式蛇行制御」の実施に際し、その制御量の目標値が定かではない。
熱間圧延鋼帯の蛇行の制御において、蛇行挙動を安定して制御し、可能な限り蛇行量をゼロに近づけて通板させるためには制御目標値を適切に設定する必要がある。 Further, even in the case of the meandering control method of the material to be rolled shown in Patent Document 2, when the "sensor method meandering control" and the "differential load method meandering control" are carried out, the target value of the control amount is not clear. Absent.
In the control of meandering of hot-rolled steel strips, it is necessary to appropriately set the control target value in order to stably control the meandering behavior and to make the meandering amount as close to zero as possible.

従って、本発明はこの従来の問題点を解決するためになされたものであり、その目的は、熱間圧延鋼帯の蛇行の制御において、制御目標値を適切に設定することによって、蛇行挙動を安定して制御し、可能な限り蛇行量を０ｍｍに近づけて通板させることができる、熱間圧延鋼帯の蛇行制御方法、蛇行制御装置及び熱間圧延設備を提供することにある。 Therefore, the present invention has been made to solve this conventional problem, and an object of the present invention is to control meandering behavior of a hot-rolled steel strip by appropriately setting a control target value. It is an object of the present invention to provide a meandering control method, a meandering control device, and a hot rolling facility for a hot-rolled steel strip, which can be stably controlled and the meandering amount can be passed as close to 0 mm as possible.

上記課題を解決するために、本発明の一態様に係る熱間圧延鋼帯の蛇行制御方法は、操作側及び駆動側の圧延荷重を検出する荷重検出器と、操作側及び駆動側の圧下量を調整するレベリング装置とをそれぞれが有する複数の圧延機を備えた仕上圧延設備で圧延される熱間圧延鋼帯の蛇行を制御する熱間圧延鋼帯の蛇行制御方法であって、隣り合う圧延機間に設置された蛇行量測定装置により、走行する熱間圧延鋼帯の蛇行量を測定する蛇行量測定ステップと、レベリング制御演算装置により、前記蛇行量測定装置が設置されている位置の下流側直近にある制御対象の圧延機に設けられた荷重検出器により検出された操作側及び駆動側の圧延荷重から操作側及び駆動側の差荷重を求める差荷重算出ステップと、レベリング制御演算装置により、走行する前記熱間圧延鋼帯の尾端部が制御開始箇所としての前記熱間圧延鋼帯の搬送ライン上の所定箇所を抜けてから前記蛇行量測定装置を抜けるまでの第１制御区間において、前記蛇行量測定装置によって測定された前記熱間圧延鋼帯の蛇行量と、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重とに基づいて、前記制御対象の圧延機における操作側及び駆動側のロールギャップの開度差であるロール開度差を演算し、前記熱間圧延鋼帯の尾端部が前記蛇行量測定装置を抜けてから前記制御対象の圧延機を抜けるまでの第２制御区間において、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重に基づいて、前記制御対象の圧延機における操作側及び駆動側のロール開度差を演算するレベリング制御演算ステップとを含み、前記レベリング制御演算ステップによって演算される前記制御対象の圧延機における操作側及び駆動側のロール開度差の目標値を、前記第１制御区間において、前記蛇行量測定装置によって測定される前記熱間圧延鋼帯の蛇行量が０ｍｍとなり、かつ、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められる操作側及び駆動側の差荷重が、前記尾端部が前記第１制御区間の制御開始箇所を抜けたときの、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重となるような前記制御対象の圧延機の操作側及び駆動側のロール開度差とし、前記第２制御区間において、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められる操作側及び駆動側の差荷重が、前記尾端部が前記第２制御区間の制御開始箇所を抜けたときの、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重となるような前記制御対象の圧延機の操作側及び駆動側のロール開度差とすることを要旨とする。 In order to solve the above problems, the method for controlling the meandering of a hot-rolled steel strip according to one aspect of the present invention includes a load detector that detects rolling loads on the operation side and the drive side, and a reduction amount on the operation side and the drive side. A method for controlling the meandering of hot-rolled steel strips, which controls the meandering of hot-rolled steel strips rolled by a finishing rolling facility equipped with a plurality of rolling mills, each of which has a leveling device for adjusting, and adjacent rolling. A meandering amount measuring step for measuring the meandering amount of a hot-rolled steel strip running by a meandering amount measuring device installed between machines, and a leveling control calculation device downstream of the position where the meandering amount measuring device is installed. The difference load calculation step for obtaining the difference load between the operation side and the drive side from the rolling load on the operation side and the drive side detected by the load detector provided in the rolling mill to be controlled near the side, and the leveling control calculation device. In the first control section from when the tail end of the traveling hot-rolled steel strip passes through a predetermined location on the transport line of the hot-rolled steel strip as a control start location to when it passes through the meandering amount measuring device. , Obtained from the meandering amount of the hot-rolled steel strip measured by the meandering amount measuring device and the rolling load on the operation side and the driving side detected by the load detector provided in the rolling mill to be controlled. The roll opening difference, which is the difference in opening of the roll gap between the operating side and the driving side in the rolling mill to be controlled, is calculated based on the difference load between the operating side and the driving side, and the hot rolled steel strip is formed. In the second control section from when the tail end portion passes through the meandering amount measuring device to when it passes through the rolling mill to be controlled, the operation side and the operation side detected by the load detector provided in the rolling mill to be controlled The leveling control calculation step of calculating the roll opening difference between the operation side and the drive side in the rolling mill to be controlled based on the difference load between the operation side and the drive side obtained from the rolling load on the drive side is included. The target value of the roll opening difference between the operation side and the drive side in the rolling mill to be controlled, which is calculated by the leveling control calculation step, is the hot rolling measured by the meandering amount measuring device in the first control section. The meandering amount of the steel strip is 0 mm, and the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector provided in the rolling mill to be controlled is It was obtained from the rolling loads on the operation side and the driving side detected by the load detector provided in the rolling mill to be controlled when the tail end portion passed through the control start portion of the first control section. operation The roll opening difference between the operating side and the driving side of the rolling mill to be controlled so as to be a difference load between the side and the driving side, and the load detection provided in the rolling mill to be controlled in the second control section. The control target when the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the device passes through the control start portion of the second control section. The operating side and the driving side of the rolling mill to be controlled so that the difference load between the operating side and the driving side obtained from the rolling load on the operating side and the driving side detected by the load detector provided on the rolling mill is obtained. The gist is to make the difference in roll opening.

なお、ここでいう「蛇行量測定装置によって測定される熱間圧延鋼帯の蛇行量が０ｍｍ」とは、熱間圧延機の付帯設備に応じた幅方向のオフセット量を考慮してその蛇行量が０±２０ｍｍ以内であればよいことを意味する。これは、次の本発明の別の態様に係る熱間圧延鋼帯の蛇行制御方法、本発明の別の態様に係る熱間圧延鋼帯の蛇行制御装置、及び本発明の別の態様に係る熱間圧延設備においても同様である。 In addition, "the meandering amount of the hot-rolled steel strip measured by the meandering amount measuring device is 0 mm" here means the meandering amount in consideration of the offset amount in the width direction according to the incidental equipment of the hot rolling mill. Means that it may be within 0 ± 20 mm. This relates to a method for controlling the meandering of a hot-rolled steel strip according to another aspect of the present invention, a meandering control device for a hot-rolled steel strip according to another aspect of the present invention, and another aspect of the present invention. The same applies to hot rolling equipment.

本発明の別の態様に係る熱間圧延鋼帯の蛇行制御方法は、操作側及び駆動側の圧延荷重を検出する荷重検出器と、操作側及び駆動側の圧下量を調整するレベリング装置とをそれぞれが有する複数の圧延機を備えた仕上圧延設備で圧延される熱間圧延鋼帯の蛇行を制御する熱間圧延鋼帯の蛇行制御方法であって、隣り合う圧延機間に設置された蛇行量測定装置により、走行する熱間圧延鋼帯の蛇行量を測定する蛇行量測定ステップと、レベリング制御演算装置により、前記蛇行量測定装置が設置されている位置の下流側直近にある制御対象の圧延機に設けられた荷重検出器により検出された操作側及び駆動側の圧延荷重から操作側及び駆動側の差荷重を求める差荷重算出ステップと、レベリング制御演算装置により、走行する前記熱間圧延鋼帯の尾端部が制御開始箇所としての前記熱間圧延鋼帯の搬送ライン上の所定箇所を抜けてから前記蛇行量測定装置を抜けるまでの第１制御区間を複数に分割した各制御区間において、前記蛇行量測定装置によって測定された前記熱間圧延鋼帯の蛇行量と、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重とに基づいて、前記制御対象の圧延機における操作側及び駆動側のロールギャップの開度差であるロール開度差を演算し、前記熱間圧延鋼帯の尾端部が前記蛇行量測定装置を抜けてから前記制御対象の圧延機を抜けるまでの第２制御区間において、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重に基づいて、前記制御対象の圧延機における操作側及び駆動側のロール開度差を演算するレベリング制御演算ステップとを含み、前記レベリング制御演算ステップによって演算される前記制御対象の圧延機における操作側及び駆動側のロール開度差の目標値を、前記各制御区間において、前記蛇行量測定装置によって測定される前記熱間圧延鋼帯の蛇行量が０ｍｍとなり、かつ、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められる操作側及び駆動側の差荷重が、前記尾端部が前記各制御区間の制御開始箇所を抜けたときの、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重となるような前記制御対象の圧延機の操作側及び駆動側のロール開度差とし、前記第２制御区間において、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められる操作側及び駆動側の差荷重が、前記尾端部が前記第２制御区間の制御開始箇所を抜けたときの、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重となるような前記制御対象の圧延機の操作側及び駆動側のロール開度差とすることを要旨とする。 A method for controlling meandering of a hot-rolled steel strip according to another aspect of the present invention includes a load detector that detects rolling loads on the operating side and the driving side, and a leveling device that adjusts the rolling amount on the operating side and the driving side. This is a method for controlling the meandering of hot-rolled steel strips, which controls the meandering of hot-rolled steel strips rolled by a finishing rolling facility equipped with a plurality of rolling mills, which is provided between adjacent rolling mills. A meandering amount measuring step for measuring the meandering amount of a hot-rolled steel strip running by a quantity measuring device, and a control target located immediately downstream of the position where the meandering amount measuring device is installed by a leveling control calculation device. The hot rolling traveling by the difference load calculation step of obtaining the difference load between the operation side and the drive side from the rolling load on the operation side and the drive side detected by the load detector provided in the rolling mill and the leveling control calculation device. Each control section is divided into a plurality of first control sections from when the tail end of the steel strip passes through a predetermined position on the transport line of the hot-rolled steel strip as a control start point to when it passes through the meandering amount measuring device. In, it is obtained from the meandering amount of the hot-rolled steel strip measured by the meandering amount measuring device and the rolling load on the operation side and the driving side detected by the load detector provided in the rolling mill to be controlled. Based on the difference load between the operating side and the driving side, the roll opening difference, which is the opening difference between the rolling gaps on the operating side and the driving side in the rolling mill to be controlled, is calculated, and the hot-rolled steel strip is calculated. The operation side detected by the load detector provided in the rolling mill to be controlled in the second control section from when the tail end portion of the rolling mill passes through the rolling mill to be controlled. And a leveling control calculation step for calculating the roll opening difference between the operation side and the drive side in the rolling mill to be controlled based on the difference load between the operation side and the drive side obtained from the rolling load on the drive side. The target value of the roll opening difference between the operation side and the drive side in the rolling mill to be controlled, which is calculated by the leveling control calculation step, is measured by the meandering amount measuring device in each control section. The meandering amount of the steel strip is 0 mm, and the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector provided in the rolling mill to be controlled is The operation obtained from the rolling load on the operation side and the driving side detected by the load detector provided in the rolling mill to be controlled when the tail end portion passes through the control start portion of each control section. ~ side And the roll opening difference between the operation side and the drive side of the rolling mill to be controlled so as to be a difference load on the drive side, and the load detector provided on the rolling mill to be controlled in the second control section. When the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the above means that the tail end portion passes through the control start portion of the second control section, the rolling of the control target The operating side and the driving side of the rolling mill to be controlled so that the difference load between the operating side and the driving side obtained from the rolling load on the operating side and the driving side detected by the load detector provided on the machine is obtained. The gist is that the roll opening difference is used.

また、本発明の別の態様に係る熱間圧延鋼帯の蛇行制御装置は、操作側及び駆動側の圧延荷重を検出する荷重検出器と、操作側及び駆動側の圧下量を調整するレベリング装置とをそれぞれが有する複数の圧延機を備えた仕上圧延設備で圧延される熱間圧延鋼帯の蛇行を制御する熱間圧延鋼帯の蛇行制御装置であって、隣り合う圧延機間に設置された、走行する熱間圧延鋼帯の蛇行量を測定する蛇行量測定装置と、走行する前記熱間圧延鋼帯の尾端部が制御開始箇所としての前記熱間圧延鋼帯の搬送ライン上の所定箇所を抜けてから前記蛇行量測定装置を抜けるまでの第１制御区間において、前記蛇行量測定装置によって測定された前記熱間圧延鋼帯の蛇行量と、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重とに基づいて、前記制御対象の圧延機における操作側及び駆動側のロールギャップの開度差であるロール開度差を演算し、前記熱間圧延鋼帯の尾端部が前記蛇行量測定装置を抜けてから前記制御対象の圧延機を抜けるまでの第２制御区間において、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重に基づいて、前記制御対象の圧延機における操作側及び駆動側のロール開度差を演算するレベリング制御演算装置とを備え、該レベリング制御演算装置によって演算される前記制御対象の圧延機における操作側及び駆動側のロール開度差の目標値を、前記第１制御区間において、前記蛇行量測定装置によって測定される前記熱間圧延鋼帯の蛇行量が０ｍｍとなり、かつ、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められる操作側及び駆動側の差荷重が、前記尾端部が前記第１制御区間の制御開始箇所を抜けたときの、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重となるような前記制御対象の圧延機の操作側及び駆動側のロール開度差とし、前記第２制御区間において、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められる操作側及び駆動側の差荷重が、前記尾端部が前記第２制御区間の制御開始箇所を抜けたときの、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重となるような前記制御対象の圧延機の操作側及び駆動側のロール開度差とすることを要旨とする。 Further, the meandering control device for hot-rolled steel strips according to another aspect of the present invention includes a load detector that detects rolling loads on the operation side and the drive side, and a leveling device that adjusts the reduction amount on the operation side and the drive side. It is a meandering control device for hot-rolled steel strips that controls the meandering of hot-rolled steel strips that are rolled by a finishing rolling facility equipped with a plurality of rolling mills, each of which is installed between adjacent rolling mills. In addition, a meandering amount measuring device for measuring the meandering amount of the traveling hot-rolled steel strip and the tail end of the traveling hot-rolled steel strip on the transport line of the hot-rolled steel strip as a control start point. In the first control section from passing through the predetermined portion to passing through the meandering amount measuring device, the meandering amount of the hot-rolled steel strip measured by the meandering amount measuring device and the meandering amount of the hot-rolled steel strip and the rolling mill to be controlled are provided. Based on the difference load on the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector, the roll gap on the operation side and the drive side in the rolling mill to be controlled is The roll opening difference, which is the opening difference, is calculated, and in the second control section from when the tail end portion of the hot-rolled steel strip passes through the meandering amount measuring device to when it passes through the rolling mill to be controlled. Based on the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector provided on the rolling mill to be controlled, the operation side in the rolling mill to be controlled. And a leveling control calculation device for calculating the roll opening difference on the drive side, and the target value of the roll opening difference between the operation side and the drive side in the rolling mill to be controlled calculated by the leveling control calculation device. In the first control section, the meandering amount of the hot-rolled steel strip measured by the meandering amount measuring device is 0 mm, and the operation detected by the load detector provided in the rolling mill to be controlled. The difference load on the operation side and the drive side obtained from the rolling load on the side and the drive side is provided on the rolling mill to be controlled when the tail end portion passes through the control start portion of the first control section. The roll opening difference between the operation side and the drive side of the rolling mill to be controlled is set so that the difference load between the operation side and the drive side is obtained from the rolling load on the operation side and the drive side detected by the load detector. In the second control section, the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector provided on the rolling mill to be controlled is the tail end. Before when the unit passes through the control start point of the second control section Operation of the rolling mill to be controlled so that the difference load between the operating side and the driving side is obtained from the rolling load on the operating side and the driving side detected by the load detector provided on the rolling mill to be controlled. The gist is that the roll opening difference between the side and the drive side is used.

また、本発明の別の態様に係る熱間圧延鋼帯の蛇行制御装置は、操作側及び駆動側の圧延荷重を検出する荷重検出器と、操作側及び駆動側の圧下量を調整するレベリング装置とをそれぞれが有する複数の圧延機を備えた仕上圧延設備で圧延される熱間圧延鋼帯の蛇行を制御する熱間圧延鋼帯の蛇行制御装置であって、隣り合う圧延機間に設置された、走行する熱間圧延鋼帯の蛇行量を測定する蛇行量測定装置と、走行する前記熱間圧延鋼帯の尾端部が制御開始箇所としての前記熱間圧延鋼帯の搬送ライン上の所定箇所を抜けてから前記蛇行量測定装置を抜けるまでの第１制御区間を複数に分割した各制御区間において、前記蛇行量測定装置によって測定された前記熱間圧延鋼帯の蛇行量と、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重とに基づいて、前記制御対象の圧延機における操作側及び駆動側のロールギャップの開度差であるロール開度差を演算し、前記熱間圧延鋼帯の尾端部が前記蛇行量測定装置を抜けてから前記制御対象の圧延機を抜けるまでの第２制御区間において、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重に基づいて、前記制御対象の圧延機における操作側及び駆動側のロール開度差を演算するレベリング制御演算とを備え、該レベリング制御演算装置によって演算される前記制御対象の圧延機における操作側及び駆動側のロール開度差の目標値を、前記各制御区間において、前記蛇行量測定装置によって測定される前記熱間圧延鋼帯の蛇行量が０ｍｍとなり、かつ、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められる操作側及び駆動側の差荷重が、前記尾端部が前記各制御区間の制御開始箇所を抜けたときの、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重となるような前記制御対象の圧延機の操作側及び駆動側のロール開度差とし、前記第２制御区間において、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められる操作側及び駆動側の差荷重が、前記尾端部が前記第２制御区間の制御開始箇所を抜けたときの、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重となるような前記制御対象の圧延機の操作側及び駆動側のロール開度差とすることを要旨とする。 Further, the meandering control device for hot-rolled steel strips according to another aspect of the present invention includes a load detector that detects rolling loads on the operation side and the drive side, and a leveling device that adjusts the reduction amount on the operation side and the drive side. It is a meandering control device for hot-rolled steel strips that controls the meandering of hot-rolled steel strips that are rolled by a finishing rolling facility equipped with a plurality of rolling mills, each of which is installed between adjacent rolling mills. In addition, a meandering amount measuring device for measuring the meandering amount of the traveling hot-rolled steel strip and the tail end of the traveling hot-rolled steel strip on the transport line of the hot-rolled steel strip as a control start point. In each control section in which the first control section from passing through the predetermined portion to passing through the meandering amount measuring device is divided into a plurality of parts, the meandering amount of the hot-rolled steel strip measured by the meandering amount measuring device and the meandering amount of the hot-rolled steel strip Operation in the control target rolling mill based on the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector provided in the rolling mill to be controlled. The roll opening difference, which is the opening difference between the roll gaps on the side and the drive side, is calculated, and the tail end portion of the hot-rolled steel strip passes through the meandering amount measuring device until it passes through the rolling mill to be controlled. In the second control section of the above, based on the difference load on the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector provided in the rolling mill to be controlled. It is provided with a leveling control calculation for calculating the roll opening difference between the operation side and the drive side of the rolling mill to be controlled, and the roll opening of the operation side and the drive side of the rolling mill to be controlled is calculated by the leveling control calculation device. The target value of the degree difference is such that the meandering amount of the hot-rolled steel strip measured by the meandering amount measuring device is 0 mm in each of the control sections, and the load detection provided in the rolling mill to be controlled. Rolling of the controlled object when the difference load on the operating side and the driving side obtained from the rolling load on the operating side and the driving side detected by the vessel passes through the control start point of each control section. On the operating side and the driving side of the rolling mill to be controlled so that the difference load between the operating side and the driving side obtained from the rolling load on the operating side and the driving side detected by the load detector provided on the machine is obtained. The difference in roll opening degree is defined as the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector provided in the rolling mill to be controlled in the second control section. However, the tail end is the control start location of the second control section. The control is such that the difference load between the operation side and the drive side is obtained from the rolling load on the operation side and the drive side detected by the load detector provided in the rolling mill to be controlled. The gist is that the roll opening difference between the operation side and the drive side of the target rolling mill is used.

更に、本発明の別の態様に係る熱間圧延設備は、前述の熱間圧延鋼帯の蛇行制御装置を有することを要旨とする。 Further, it is a gist that the hot rolling equipment according to another aspect of the present invention has the above-mentioned meandering control device for hot rolled steel strips.

本発明に係る熱間圧延鋼帯の蛇行制御方法、蛇行制御装置及び熱間圧延設備によれば、熱間圧延鋼帯の蛇行の制御において、制御目標値を適切に設定することによって、蛇行挙動を安定して制御し、可能な限り蛇行量を０ｍｍに近づけて通板させることができる、熱間圧延鋼帯の蛇行制御方法、蛇行制御装置及び熱間圧延設備を提供できる。 According to the meandering control method, the meandering control device, and the hot rolling equipment of the hot-rolled steel strip according to the present invention, the meandering behavior is performed by appropriately setting the control target value in the meandering control of the hot-rolled steel strip. It is possible to provide a meandering control method, a meandering control device, and a hot rolling facility for a hot-rolled steel strip, which can stably control the meandering amount and allow the sheet to pass through as close to 0 mm as possible.

本発明の第１実施形態に係る蛇行制御装置を備えた仕上圧延設備の概略構成図である。It is a schematic block diagram of the finishing rolling equipment provided with the meandering control device which concerns on 1st Embodiment of this invention. 本発明の第１実施形態に係る蛇行制御装置による処理の流れを示すフローチャートである。It is a flowchart which shows the flow of processing by the meandering control apparatus which concerns on 1st Embodiment of this invention. 本発明の第２実施形態に係る蛇行制御装置を備えた仕上圧延設備の概略構成図である。It is a schematic block diagram of the finishing rolling equipment provided with the meandering control device which concerns on 2nd Embodiment of this invention. 本発明の第２実施形態に係る蛇行制御装置による処理の流れを示すフローチャートである。It is a flowchart which shows the flow of processing by the meandering control apparatus which concerns on 2nd Embodiment of this invention. 実施例１及び比較例１に係る蛇行制御装置で蛇行制御を行った場合の圧延機Ｆ７での蛇行量の時間変化を示すグラフである。It is a graph which shows the time change of the meandering amount in the rolling mill F7 when the meandering control is performed by the meandering control device which concerns on Example 1 and Comparative Example 1. 一般的な仕上圧延設備の概略構成図である。It is a schematic block diagram of a general finishing rolling equipment. 鋼帯の蛇行現象を説明するための模式図である。It is a schematic diagram for demonstrating the meandering phenomenon of a steel strip.

以下、本発明の実施の形態を図面を参照して説明する。以下に示す実施形態は、本発明の技術的思想を具体化するための装置や方法を例示するものであって、本発明の技術的思想は、構成部品の材質、形状、構造、配置等を下記の実施形態に特定するものではない。また、図面は模式的なものである。そのため、厚みと平面寸法との関係、比率等は現実のものとは異なることに留意すべきであり、図面相互間においても互いの寸法の関係や比率が異なる部分が含まれている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments shown below exemplify devices and methods for embodying the technical idea of the present invention, and the technical idea of the present invention describes the material, shape, structure, arrangement, etc. of the components. It is not specified in the following embodiments. The drawings are schematic. Therefore, it should be noted that the relationship, ratio, etc. between the thickness and the plane dimension are different from the actual ones, and the drawings include parts in which the relationship and ratio of the dimensions are different from each other.

（第１実施形態）
図１には、本発明の第１実施形態に係る蛇行制御装置を備えた仕上圧延設備の概略構成が示されている。
熱間圧延鋼帯の熱間圧延設備では、加熱炉（図示せず）で加熱されたスラブが粗圧延工程、仕上圧延工程及び冷却工程を経て、所定の板幅及び板厚の鋼板が製造され、巻き取られる。つまり、熱間圧延設備は、加熱炉と、粗圧延機（図示せず）と、仕上圧延設備１（図１参照）と、冷却設備（図示せず）と、巻取設備（図示せず）とを備えている。 (First Embodiment)
FIG. 1 shows a schematic configuration of a finishing rolling equipment provided with a meandering control device according to the first embodiment of the present invention.
In the hot rolling equipment for hot rolled steel strips, slabs heated in a heating furnace (not shown) undergo a rough rolling process, a finish rolling process, and a cooling process to produce steel sheets with a predetermined plate width and thickness. , Rolled up. That is, the hot rolling equipment includes a heating furnace, a rough rolling machine (not shown), a finishing rolling equipment 1 (see FIG. 1), a cooling equipment (not shown), and a winding equipment (not shown). And have.

仕上圧延工程では、図１に示す仕上圧延設備１で熱間圧延鋼帯（以下、単に鋼帯という）１０が同時に仕上圧延されるタンデム圧延が行われる。仕上圧延設備１は、鋼帯１０を仕上圧延する複数（本実施形態にあっては７台）の圧延機Ｆ１〜Ｆ７を備えている。各圧延機Ｆ１〜Ｆ７には、操作側及び駆動側の圧下量を調整するレベリング装置２と、操作側及び駆動側の圧延荷重を検出する荷重検出器３とが設けられている。鋼帯１０は、図１における矢印で示す方向に走行する（搬送される）。なお、各圧延機Ｆ１〜Ｆ７における駆動側とは、搬送ロール（図示せず）の駆動モータがある側を意味し、操作側とはその反対側を意味する。 In the finish rolling step, tandem rolling is performed in which the hot-rolled steel strip (hereinafter, simply referred to as a steel strip) 10 is finish-rolled at the same time in the finish rolling facility 1 shown in FIG. The finish rolling equipment 1 includes a plurality of rolling mills F1 to F7 (7 units in the present embodiment) for finish rolling the steel strip 10. Each rolling mill F1 to F7 is provided with a leveling device 2 for adjusting the rolling reduction amount on the operation side and the drive side, and a load detector 3 for detecting the rolling load on the operation side and the drive side. The steel strip 10 travels (is conveyed) in the direction indicated by the arrow in FIG. The drive side of each rolling mill F1 to F7 means the side where the drive motor of the transfer roll (not shown) is located, and the side opposite to the operation side.

各レベリング装置２は、各圧延機Ｆ１〜Ｆ７の操作側に取り付けられた圧下装置（図示せず）による圧下量と、各圧延機Ｆ１〜Ｆ７の駆動側に取り付けられた圧下装置（図示せず）による圧下量とを調整する。
また、荷重検出器３は、各圧延機Ｆ１〜Ｆ７の操作側と駆動側との双方に取り付けられて操作側及び駆動側のそれぞれの圧延荷重を検出する。
また、仕上圧延設備１には、鋼帯１０の蛇行を制御する蛇行制御装置４が設けられている。蛇行制御装置４は、走行する鋼帯１０の尾端部１０ａ（図７参照）が圧延機Ｆ６を抜けてから蛇行量測定装置５を抜けるまでの第１制御区間Ａにおいて、「蛇行計方式の蛇行制御」及び「「差荷重方式の蛇行制御」を併用する。また、蛇行制御装置４は、当該尾端部１０ａが蛇行量測定装置５を抜けてから制御対象の圧延機Ｆ７を抜けるまでの第２制御区間Ｂにおいて、「差荷重方式の蛇行制御」によって鋼帯１０の蛇行を制御する。 Each leveling device 2 includes the amount of rolling by the rolling mills (not shown) attached to the operation side of the rolling mills F1 to F7 and the rolling mills (not shown) mounted on the drive side of the rolling mills F1 to F7. ) Adjust the amount of rolling.
Further, the load detector 3 is attached to both the operation side and the drive side of the rolling mills F1 to F7 to detect the rolling load of each of the operation side and the drive side.
Further, the finishing rolling equipment 1 is provided with a meandering control device 4 for controlling the meandering of the steel strip 10. The meandering control device 4 is a "meandering meter type" in the first control section A from the time when the tail end portion 10a (see FIG. 7) of the traveling steel strip 10 passes through the rolling mill F6 to the time when the meandering amount measuring device 5 passes through. "Meander control" and "difference load type meander control" are used together. Further, the meandering control device 4 is made of steel by "difference load type meandering control" in the second control section B from when the tail end portion 10a passes through the meandering amount measuring device 5 to when it passes through the rolling mill F7 to be controlled. Controls the meandering of the band 10.

ここで、「蛇行計方式の蛇行制御」は、後に述べる蛇行量測定装置５が設置されている位置の下流側直近にある制御対象の圧延機Ｆ７のレベリング量（圧延機Ｆ７における操作側及び駆動側のロールギャップの開度差であるロール開度差）を、蛇行量測定装置５で測定された蛇行量に比例するように変更するものである。鋼帯１０の蛇行が操作側に生じていれば、操作側が閉まるように（「−」側に）レベリング量を変更し、鋼帯１０の蛇行が駆動側に生じていれば、駆動側が閉まるように（「＋」側に）レベリング量を変更する。 Here, the "meandering meter type meandering control" refers to the leveling amount of the rolling mill F7 to be controlled (the operating side and the driving of the rolling mill F7) located immediately downstream of the position where the meandering amount measuring device 5 is installed. The roll opening difference), which is the difference in opening of the roll gap on the side, is changed so as to be proportional to the meandering amount measured by the meandering amount measuring device 5. If the meandering of the steel strip 10 occurs on the operating side, change the leveling amount so that the operating side closes (to the "-" side), and if the meandering of the steel strip 10 occurs on the driving side, the driving side closes. Change the leveling amount (to the "+" side).

また、「差荷重方式の蛇行制御」は、制御対象の圧延機Ｆ７のレベリング量を、圧延機Ｆ７に設けられた荷重検出器３から検出された操作側及び駆動側の差荷重に比例するように変更するものである。操作側の圧延荷重が駆動側の圧延荷重よりも大きい場合、差荷重は「＋」、駆動側の圧延荷重が操作側の圧延荷重よりも大きい場合、差荷重は「−」とする。そして、鋼帯１０に幅方向の板厚偏差、幅方向の温度差がない場合、鋼帯１０が圧延機Ｆ１〜Ｆ７の中心を通板されていれば、差荷重は生じない。そして、鋼帯１０の蛇行が操作側に生じたときに差荷重は「＋」となり、鋼帯１０の蛇行が駆動側に生じたときに差荷重は「−」となる。この「差荷重方式の蛇行制御」では、差荷重が「＋」であれば操作側が閉まるようにレベリング量を変更し、差荷重が「−」であれば駆動側が閉まるようにレベリング量を変更する。 Further, in the "difference load method meandering control", the leveling amount of the rolling mill F7 to be controlled is proportional to the differential load on the operation side and the drive side detected from the load detector 3 provided in the rolling mill F7. It is to change to. When the rolling load on the operation side is larger than the rolling load on the drive side, the differential load is "+", and when the rolling load on the drive side is larger than the rolling load on the operation side, the differential load is "-". When the steel strip 10 has no plate thickness deviation in the width direction and no temperature difference in the width direction, if the steel strip 10 is passed through the center of the rolling mills F1 to F7, no differential load is generated. Then, when the meandering of the steel strip 10 occurs on the operation side, the differential load becomes “+”, and when the meandering of the steel strip 10 occurs on the driving side, the differential load becomes “−”. In this "difference load method meandering control", the leveling amount is changed so that the operation side is closed when the difference load is "+", and the leveling amount is changed so that the drive side is closed when the difference load is "-". ..

そして、蛇行制御装置４は、隣り合う圧延機Ｆ６と圧延機Ｆ７との間に設置された、走行する鋼帯１０の蛇行量を測定する蛇行量測定装置５を備えている。蛇行量測定装置５は、１次元カメラや２次元カメラで構成され、例えば、鋼帯１０の幅方向の輝度分布を測定しこの輝度分布から鋼帯１０の幅方向の両端部を特定する。そして、特定された鋼帯１０の操作側の端部と駆動側の端部から鋼帯１０の幅方向の中央位置を算出し、圧延機Ｆ１〜Ｆ７の幅方向の中央位置と算出された鋼帯１０の幅方向の中央位置との距離を蛇行量として算出する。蛇行量を算出するための演算装置は、蛇行量測定装置５と別個に構成しても、あるいは蛇行量測定装置５に演算機能を備えるようにしてもよい。 The meandering control device 4 includes a meandering amount measuring device 5 that measures the meandering amount of the traveling steel strip 10 installed between the adjacent rolling mills F6 and F7. The meandering amount measuring device 5 is composed of a one-dimensional camera or a two-dimensional camera. For example, the brightness distribution in the width direction of the steel strip 10 is measured, and both ends of the steel strip 10 in the width direction are specified from the brightness distribution. Then, the center position in the width direction of the steel strip 10 is calculated from the operation side end portion and the drive side end portion of the specified steel strip 10, and the calculated steel is the center position in the width direction of the rolling mills F1 to F7. The distance from the center position in the width direction of the band 10 is calculated as the meandering amount. The arithmetic unit for calculating the meandering amount may be configured separately from the meandering amount measuring device 5, or the meandering amount measuring device 5 may be provided with an arithmetic function.

また、蛇行制御装置４は、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から操作側及び駆動側の差荷重を求めるレベリング制御演算装置６を備えている。
このレベリング制御演算装置６は、走行する鋼帯１０の尾端部１０ａが制御開始箇所としての圧延機Ｆ６を抜けてから蛇行量測定装置５を抜けるまでの第１制御区間Ａにおいて、蛇行量測定装置５によって測定された鋼帯１０の蛇行量と、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重とに基づいて、制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差を演算する。 Further, the meandering control device 4 is a leveling control calculation device 6 that obtains a difference load between the operation side and the drive side from the rolling load on the operation side and the drive side detected by the load detector 3 provided in the rolling mill F7 to be controlled. It has.
The leveling control calculation device 6 measures the meandering amount in the first control section A from the time when the tail end portion 10a of the traveling steel strip 10 passes through the rolling mill F6 as the control start point to the time when it passes through the meandering amount measuring device 5. The amount of meandering of the steel strip 10 measured by the apparatus 5 and the rolling load on the operating side and the driving side obtained by the load detector 3 provided on the rolling mill F7 to be controlled are used to determine the operating side and the driving side. Based on the difference load, the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled is calculated.

また、このレベリング制御演算装置６は、走行する鋼帯１０の尾端部１０ａが蛇行量測定装置５を抜けてから制御対象の圧延機Ｆ７を抜けるまでの第２制御区間Ｂにおいては、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重のみに基づいて、制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差を演算する。
そして、レベリング装置２は、レベリング制御演算装置６から送出されたロール開度差に基づいて、制御対象の圧延機Ｆ７のロール開度差がレベリング制御演算装置６から送出されたロール開度差となるように、制御対象の圧延機Ｆ７の操作側に取り付けられた圧下装置による圧下量と、圧延機Ｆ７の駆動側に取り付けられた圧下装置による圧下量とを調整する。これにより、制御対象の圧延機Ｆ７のレベリング量が鋼帯１０の蛇行量及び圧延機Ｆ７の操作側及び駆動側の差荷重に比例して変更され、鋼帯１０の蛇行量が抑制される。 Further, the leveling control calculation device 6 is controlled in the second control section B from when the tail end portion 10a of the traveling steel strip 10 passes through the meandering amount measuring device 5 to when it passes through the rolling mill F7 to be controlled. Based only on the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided on the rolling mill F7 of the above, the operation side in the rolling mill F7 to be controlled. And the roll opening difference on the drive side is calculated.
Then, in the leveling device 2, based on the roll opening difference sent from the leveling control calculation device 6, the roll opening difference of the rolling mill F7 to be controlled is the roll opening difference sent from the leveling control calculation device 6. Therefore, the amount of reduction by the rolling unit attached to the operation side of the rolling mill F7 to be controlled and the amount of rolling by the rolling unit attached to the drive side of the rolling mill F7 are adjusted. As a result, the leveling amount of the rolling mill F7 to be controlled is changed in proportion to the meandering amount of the steel strip 10 and the differential load between the operating side and the driving side of the rolling mill F7, and the meandering amount of the steel strip 10 is suppressed.

ここで、鋼帯１０の尾端部１０ａが第１制御区間Ａにあるときのレベリング制御演算装置６によって演算される制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差の目標値は、第１制御区間Ａにおいて、蛇行量測定装置５によって測定される鋼帯１０の蛇行量が０ｍｍとなり、かつ、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められる操作側及び駆動側の差荷重が、尾端部１０ａが第１制御区間Ａの制御開始箇所（圧延機Ｆ６）を抜けたときの、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重となるような制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差とする。 Here, the target value of the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 when the tail end portion 10a of the steel strip 10 is in the first control section A. In the first control section A, the meandering amount of the steel strip 10 measured by the meandering amount measuring device 5 is 0 mm, and the operation side detected by the load detector 3 provided in the rolling mill F7 to be controlled. And when the difference load between the operation side and the drive side obtained from the rolling load on the drive side passes through the control start point (roller F6) of the first control section A, the rolling mill F7 to be controlled. Rolls on the operation side and the drive side in the rolling mill F7 to be controlled so as to obtain a difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided in Let it be the difference in opening.

ここでいう「蛇行量測定装置５によって測定される鋼帯１０の蛇行量が０ｍｍ」とは、熱間圧延機の付帯設備に応じた幅方向のオフセット量を考慮してその蛇行量が０±２０ｍｍ以内であればよいことを意味する。
ここで、鋼帯１０の尾端部１０ａが各圧延機Ｆ１〜Ｆ６、特に圧延機Ｆ６を抜けると、圧延機Ｆ６、Ｆ７間の張力が失われることになり、鋼帯１０の蛇行が急激に大きくなる。このため、第１制御区間Ａの制御開始時刻を制御対象の圧延機Ｆ７の１つ上流側の圧延機Ｆ６を抜けたときとすることで、蛇行の発散開始とともに蛇行を制御することができる。 Here, "the meandering amount of the steel strip 10 measured by the meandering amount measuring device 5 is 0 mm" means that the meandering amount is 0 ± in consideration of the offset amount in the width direction according to the incidental equipment of the hot rolling mill. It means that it may be within 20 mm.
Here, when the tail end portion 10a of the steel strip 10 passes through the rolling mills F1 to F6, particularly the rolling mill F6, the tension between the rolling mills F6 and F7 is lost, and the meandering of the steel strip 10 suddenly occurs. growing. Therefore, by setting the control start time of the first control section A to the time when the rolling mill F6 on the upstream side of the rolling mill F7 to be controlled is passed, the meandering can be controlled at the same time as the start of divergence of the meandering.

そして、鋼帯１０の尾端部１０ａが第１制御区間Ａにあるときのレベリング制御演算装置６によって演算される制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差の目標値を、第１制御区間Ａにおいて、蛇行量測定装置５によって測定される鋼帯１０の蛇行量が０ｍｍとなるようなロール開度差とすることで、鋼帯１０の蛇行量を０ｍｍに近づけることができる。
一方、当該制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差の目標値を、第１制御区間Ａにおいて、蛇行量測定装置５によって測定される鋼帯１０の蛇行量が０ｍｍとなるようなロール開度差とするだけだと、尾端部１０ａが圧延機Ｆ６を抜けて大きくなる鋼帯１０の蛇行を無理やり蛇行量が０ｍｍとなるようにするので、鋼帯１０の蛇行挙動が逆転し（例えば、操作側に蛇行していた場合、逆に駆動側に蛇行する）、かえって蛇行量が大きくなってしまうことがある。 Then, the target value of the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 when the tail end portion 10a of the steel strip 10 is in the first control section A is set. In the first control section A, the meandering amount of the steel strip 10 can be brought close to 0 mm by setting the roll opening difference so that the meandering amount of the steel strip 10 measured by the meandering amount measuring device 5 becomes 0 mm. it can.
On the other hand, the target value of the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled is set to 0 mm in the meandering amount of the steel strip 10 measured by the meandering amount measuring device 5 in the first control section A. The meandering behavior of the steel strip 10 is such that the tail end portion 10a passes through the rolling mill F6 and the meandering of the steel strip 10 becomes large by forcibly making the meandering amount 0 mm. Is reversed (for example, if it meanders to the operation side, it meanders to the drive side), and the amount of meandering may increase.

これに対して、本実施形態においては、鋼帯１０の尾端部１０ａが第１制御区間Ａにあるときのレベリング制御演算装置６によって演算される制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差の目標値を、第１制御区間Ａにおいて、蛇行量測定装置５によって測定される鋼帯１０の蛇行量が０ｍｍとなり、かつ、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められる操作側及び駆動側の差荷重が、尾端部１０ａが第１制御区間Ａの制御開始箇所（圧延機Ｆ６）を抜けたときの、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重となるようなロール開度差としてある。 On the other hand, in the present embodiment, the operation side and the drive side of the rolling mill F7 to be controlled, which is calculated by the leveling control calculation device 6 when the tail end portion 10a of the steel strip 10 is in the first control section A. In the first control section A, the meandering amount of the steel strip 10 measured by the meandering amount measuring device 5 is 0 mm, and the load detection provided in the rolling mill F7 to be controlled is set to the target value of the roll opening difference. When the difference load on the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the vessel 3 passes through the control start point (roller F6) of the first control section A at the tail end portion 10a. The roll opening difference is such that the difference load between the operation side and the drive side is obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided on the rolling mill F7 to be controlled. ..

これにより、鋼帯１０の蛇行挙動が逆転することなく、蛇行挙動を安定して制御し、可能な限り蛇行量を０ｍｍに近づけて鋼帯１０を通板させることができる。
ここで、制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差の目標値を、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められる操作側及び駆動側の差荷重が０ｔｏｎｆとなるようなロール開度差とすると、鋼帯１０の蛇行挙動が逆転する現象を抑制することができずに、蛇行挙動を安定して制御することができない。
また、圧延機Ｆ１〜Ｆ７の操作側及び駆動側の差荷重は、鋼帯１０の蛇行以外の要因（例えば、鋼帯１０の板幅方向の温度偏差など）でも発生するので、当該差荷重の制御目標値を０ｔｏｎｆとして制御すると、蛇行以外の差荷重要因の分、過剰な制御となり、鋼帯１０の蛇行挙動を逆転させる不安定な制御となってしまう。 As a result, the meandering behavior of the steel strip 10 is not reversed, the meandering behavior is stably controlled, and the meandering amount is as close to 0 mm as possible so that the steel strip 10 can be passed through.
Here, the target value of the roll opening difference between the operation side and the drive side of the rolling mill F7 to be controlled is the rolling of the operation side and the drive side detected by the load detector 3 provided in the rolling mill F7 to be controlled. If the roll opening difference is such that the difference load between the operation side and the drive side obtained from the load is 0 tonf, the phenomenon that the meandering behavior of the steel strip 10 is reversed cannot be suppressed, and the meandering behavior is stabilized. I can't control it.
Further, the differential load on the operation side and the drive side of the rolling mills F1 to F7 is generated by a factor other than meandering of the steel strip 10 (for example, a temperature deviation in the plate width direction of the steel strip 10). If the control target value is controlled to 0 tonf, the control becomes excessive due to the difference load factor other than meandering, resulting in unstable control that reverses the meandering behavior of the steel strip 10.

また、鋼帯１０の尾端部１０ａが第２制御区間Ｂにあるときのレベリング制御演算装置６によって演算される制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差の目標値は、第２制御区間Ｂにおいて、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められる操作側及び駆動側の差荷重が、尾端部１０ａが第２制御区間Ｂの制御開始箇所（蛇行量測定装置５）を抜けたときの、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重となるような制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差とする。 Further, the target value of the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 when the tail end portion 10a of the steel strip 10 is in the second control section B is In the second control section B, the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided on the rolling mill F7 to be controlled is the tail end portion. Rolling load on the operation side and drive side detected by the load detector 3 provided on the rolling mill F7 to be controlled when 10a passes through the control start point (serpentine amount measuring device 5) in the second control section B. It is the difference in roll opening degree between the operation side and the drive side in the rolling mill F7 to be controlled so that the difference load between the operation side and the drive side is obtained from.

走行する鋼帯１の尾端部１０ａが第１制御区間Ａにあるときの鋼帯１０の蛇行量が抑制されると、制御対象の圧延機Ｆ７における操作側及び駆動側の差荷重は減少していく。しかし、走行する鋼帯１０の尾端部１０ａが第２制御区間Ｂにきても、当該差荷重の目標値が尾端部１０ａが第１制御区間Ａの制御開始箇所を抜けたときの差荷重のままだと、蛇行を助長させるレベリング制御となってしまう。 When the meandering amount of the steel strip 10 when the tail end portion 10a of the traveling steel strip 1 is in the first control section A is suppressed, the differential load between the operation side and the drive side in the rolling mill F7 to be controlled decreases. To go. However, even if the tail end portion 10a of the traveling steel strip 10 comes to the second control section B, the target value of the difference load is the difference when the tail end portion 10a passes through the control start portion of the first control section A. If the load remains, leveling control will be performed to promote meandering.

このため、本実施形態にあっては、走行する鋼帯１０の尾端部１０ａが第２制御区間Ｂにあるときの当該差荷重の目標値を、尾端部１０ａが第２制御区間Ｂの制御開始箇所（蛇行量測定装置５）を抜けたときの差荷重としている。つまり、鋼帯１０の尾端部１０ａが第２制御区間Ｂにあるときのレベリング制御演算装置６によって演算される制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差の目標値を、第２制御区間Ｂにおいて、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められる操作側及び駆動側の差荷重が、尾端部１０ａが第２制御区間Ｂの制御開始箇所（蛇行量測定装置５）を抜けたときの、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重となるような制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差とした。
これにより、鋼帯１０の蛇行を助長させることなく蛇行挙動を安定して制御することができる。 Therefore, in the present embodiment, the target value of the differential load when the tail end portion 10a of the traveling steel strip 10 is in the second control section B is set, and the tail end portion 10a is in the second control section B. It is the differential load when the control start point (meandering amount measuring device 5) is passed. That is, the target value of the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 when the tail end portion 10a of the steel strip 10 is in the second control section B is set. In the second control section B, the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided on the rolling mill F7 to be controlled is the tail end portion. Rolling load on the operation side and drive side detected by the load detector 3 provided on the rolling mill F7 to be controlled when 10a passes through the control start point (serpentine amount measuring device 5) in the second control section B. The roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled is set so as to obtain the difference load between the operation side and the drive side obtained from.
As a result, the meandering behavior can be stably controlled without promoting the meandering of the steel strip 10.

次に、第１実施形態に係る蛇行制御装置４による処理の流れを図２に示すフローチャートを参照して説明する。
先ず、鋼帯１０の仕上圧延が開始され、鋼帯１０の先端部が制御対象の圧延機Ｆ７を通過したら、ステップＳ１において、隣り合う圧延機Ｆ６、Ｆ７間に設置された蛇行量測定装置５が走行する鋼帯１０の蛇行量を測定する（蛇行量測定ステップ）。
次いで、ステップＳ２に移行し、レベリング制御演算装置６は、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から操作側及び駆動側の差荷重を求める（差荷重算出ステップ）。 Next, the flow of processing by the meandering control device 4 according to the first embodiment will be described with reference to the flowchart shown in FIG.
First, the finish rolling of the steel strip 10 is started, and when the tip of the steel strip 10 passes through the rolling mill F7 to be controlled, in step S1, the meandering amount measuring device 5 installed between the adjacent rolling mills F6 and F7. Measures the meandering amount of the steel strip 10 on which the vehicle travels (meandering amount measuring step).
Next, in step S2, the leveling control arithmetic unit 6 changes the difference load between the operation side and the drive side from the rolling load on the operation side and the drive side detected by the load detector 3 provided in the rolling mill F7 to be controlled. (Difference load calculation step).

次いで、ステップＳ３に移行し、レベリング制御演算装置６は、走行する鋼帯１０の尾端部１０ａが制御開始箇所としての圧延機Ｆ６を抜けてから蛇行量測定装置５を抜けるまでの第１制御区間Ａにおいて、蛇行量測定装置５によって測定された鋼帯１０の蛇行量と、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重とに基づいて、制御対象の圧延機Ｆ７における操作側及び駆動側のロールギャップの開度差であるロール開度差を演算し、演算されたロール開度差を制御対象の圧延機Ｆ７に設けられたレベリング装置２に送出する（レベリング制御演算ステップ）。 Next, in step S3, the leveling control calculation device 6 is the first control from the time when the tail end portion 10a of the traveling steel strip 10 passes through the rolling mill F6 as the control start point to the time when it passes through the meandering amount measuring device 5. In the section A, it is obtained from the meandering amount of the steel strip 10 measured by the meandering amount measuring device 5 and the rolling load on the operation side and the driving side detected by the load detector 3 provided in the rolling mill F7 to be controlled. The roll opening difference, which is the difference in the opening of the roll gap between the operating side and the driving side in the rolling mill F7 to be controlled, is calculated based on the difference load between the operating side and the driving side, and the calculated roll opening difference is calculated. Is sent to the leveling device 2 provided in the rolling mill F7 to be controlled (leveling control calculation step).

ここで、鋼帯１０の尾端部１０ａが第１制御区間Ａにあるときのレベリング制御演算装置６によって演算される制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差の目標値を、第１制御区間Ａにおいて、蛇行量測定装置５によって測定される鋼帯１０の蛇行量が０ｍｍとなり、かつ、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められる操作側及び駆動側の差荷重が、尾端部１０ａが第１制御区間Ａの制御開始箇所（圧延機Ｆ６）を抜けたときの、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重となるような制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差とする。 Here, the target value of the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 when the tail end portion 10a of the steel strip 10 is in the first control section A. In the first control section A, the meandering amount of the steel strip 10 measured by the meandering amount measuring device 5 is 0 mm, and the operation side detected by the load detector 3 provided in the rolling mill F7 to be controlled. And when the difference load between the operation side and the drive side obtained from the rolling load on the drive side passes through the control start point (roller F6) of the first control section A, the rolling mill F7 to be controlled. Rolls on the operation side and the drive side in the rolling mill F7 to be controlled so as to obtain a difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided in Let it be the difference in opening.

これにより、前述したように、鋼帯１０の蛇行挙動が逆転することなく、蛇行挙動を安定して制御し、可能な限り蛇行量を０ｍｍに近づけて鋼帯１０を通板させることができる。
そして、鋼帯１０の尾端部１０ａが蛇行量測定装置５を抜けたときに第２制御区間Ｂが開始する。レベリング制御演算装置６は、走行する鋼帯１０の尾端部１０ａが蛇行量測定装置５を抜けてから制御対象の圧延機Ｆ７を抜けるまでの第２制御区間Ｂにおいては、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重のみに基づいて、制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差を演算し、演算されたロール開度差を制御対象の圧延機Ｆ７に設けられたレベリング装置２に送出する（レベリング制御演算ステップ）。 As a result, as described above, the meandering behavior of the steel strip 10 is not reversed, the meandering behavior is stably controlled, and the meandering amount is as close to 0 mm as possible so that the steel strip 10 can be passed through.
Then, the second control section B starts when the tail end portion 10a of the steel strip 10 passes through the meandering amount measuring device 5. The leveling control calculation device 6 is a rolling mill to be controlled in the second control section B from the time when the tail end portion 10a of the traveling steel strip 10 passes through the meandering amount measuring device 5 to the rolling mill F7 to be controlled. Based only on the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided in F7, the operation side and the drive side in the rolling mill F7 to be controlled The roll opening difference is calculated, and the calculated roll opening difference is sent to the leveling device 2 provided in the rolling mill F7 to be controlled (leveling control calculation step).

ここで、鋼帯１０の尾端部１０ａが第２制御区間Ｂにあるときのレベリング制御演算装置６によって演算される制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差の目標値を、第２制御区間Ｂにおいて、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められる操作側及び駆動側の差荷重が、尾端部１０ａが第２制御区間Ｂの制御開始箇所（蛇行量測定装置５）を抜けたときの、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重となるような制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差とする。
これにより、前述したように、鋼帯１０の蛇行を助長させることなく蛇行挙動を安定して制御することができる。 Here, the target value of the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 when the tail end portion 10a of the steel strip 10 is in the second control section B. In the second control section B, the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided on the rolling mill F7 to be controlled is the tail end. Rolling on the operation side and drive side detected by the load detector 3 provided on the rolling mill F7 to be controlled when the unit 10a passes through the control start point (serpentine amount measuring device 5) of the second control section B. It is the difference in roll opening between the operation side and the drive side in the rolling mill F7 to be controlled so that the difference load between the operation side and the drive side is obtained from the load.
As a result, as described above, the meandering behavior can be stably controlled without promoting the meandering of the steel strip 10.

次いで、ステップＳ４に移行し、レベリング装置２は、レベリング制御演算装置６から送出されたロール開度差に基づいて、制御対象の圧延機Ｆ７のロール開度差がレベリング制御演算装置６から送出されたロール開度差となるように、制御対象の圧延機Ｆ７の操作側に取り付けられた圧下装置による圧下量と、圧延機Ｆ７の駆動側に取り付けられた圧下装置による圧下量とを調整する（圧下量調整ステップ）。
これにより、制御対象の圧延機Ｆ７のレベリング量が、鋼帯１０の尾端部１０ａが第１制御区間Ａにあるときは鋼帯１０の蛇行量及び圧延機Ｆ７の操作側及び駆動側の差荷重に比例して変更され、鋼帯１０の尾端部１０ａが第２制御区間Ｂにあるときは圧延機Ｆ７の操作側及び駆動側の差荷重に比例して変更され、鋼帯１０の蛇行量が抑制される。 Next, in step S4, the leveling device 2 sends out the roll opening difference of the rolling mill F7 to be controlled from the leveling control calculation device 6 based on the roll opening difference sent from the leveling control calculation device 6. The amount of rolling by the rolling down device attached to the operation side of the rolling mill F7 to be controlled and the amount of rolling down by the rolling down device attached to the driving side of the rolling mill F7 are adjusted so as to have a difference in roll opening degree ( Rolling amount adjustment step).
As a result, the leveling amount of the rolling mill F7 to be controlled is the difference between the meandering amount of the steel strip 10 and the operating side and the driving side of the rolling mill F7 when the tail end portion 10a of the steel strip 10 is in the first control section A. It is changed in proportion to the load, and when the tail end 10a of the steel strip 10 is in the second control section B, it is changed in proportion to the difference load between the operation side and the drive side of the rolling mill F7, and the steel strip 10 meanders. The amount is suppressed.

（第２実施形態）
次に、本発明の第２実施形態に係る蛇行制御装置について図３及び図４を参照して説明する。図３には、本発明の第２実施形態に係る蛇行制御装置を備えた仕上圧延設備の概略構成が示されている。図４には、本発明の第２実施形態に係る蛇行制御装置による処理の流れを示すフローチャートが示されている。
第２実施形態に係る蛇行制御装置４は、第１実施形態に係る蛇行制御装置４と基本構成は同様であるが、第１実施形態に係る蛇行制御装置４における第１制御区間Ａを、走行する鋼帯１０の尾端部１０ａが圧延機Ｆ６の１つ上流側の圧延機Ｆ５を抜けてから蛇行量測定装置５を抜けるまでとし、当該第１制御区間Ａを、走行する鋼帯１０の尾端部１０ａが圧延機Ｆ５を抜けてから圧延機Ｆ６を抜けるまでの制御区間Ａ１と、尾端部１０ａが圧延機Ｆ６を抜けてから蛇行量測定装置５を抜けるまでの制御区間Ａ２に分割したものである。 (Second Embodiment)
Next, the meandering control device according to the second embodiment of the present invention will be described with reference to FIGS. 3 and 4. FIG. 3 shows a schematic configuration of a finishing rolling equipment provided with a meandering control device according to a second embodiment of the present invention. FIG. 4 shows a flowchart showing the flow of processing by the meandering control device according to the second embodiment of the present invention.
The meandering control device 4 according to the second embodiment has the same basic configuration as the meandering control device 4 according to the first embodiment, but travels in the first control section A in the meandering control device 4 according to the first embodiment. The tail end portion 10a of the steel strip 10 is from passing through the rolling mill F5 on the upstream side of the rolling mill F6 until passing through the meandering amount measuring device 5, and the steel strip 10 traveling in the first control section A. The tail end 10a is divided into a control section A1 from passing through the rolling mill F5 to passing through the rolling mill F6 and a control section A2 from passing the tail end 10a through the rolling mill F6 to passing through the meandering amount measuring device 5. It was done.

この第２実施形態に係る蛇行制御装置４において、レベリング制御演算装置６は、分割した各制御区間Ａ１，Ａ２において、圧延機Ｆ６と圧延機Ｆ７との間に設置された蛇行量測定装置５によって測定された鋼帯１０の蛇行量と、制御対象の圧延機Ｆ７に設けられた荷重検出器３より検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重とに基づいて、制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差を演算する。そして、レベリング制御演算装置６は、演算されたロール開度差を制御対象の圧延機Ｆ７に設けられたレベリング装置２に送出する。 In the meandering control device 4 according to the second embodiment, the leveling control calculation device 6 is provided by the meandering amount measuring device 5 installed between the rolling mill F6 and the rolling mill F7 in each of the divided control sections A1 and A2. The measured meandering amount of the steel strip 10 and the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided on the rolling mill F7 to be controlled. The roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled is calculated based on the above. Then, the leveling control calculation device 6 sends the calculated roll opening difference to the leveling device 2 provided in the rolling mill F7 to be controlled.

また、このレベリング制御演算装置６は、走行する鋼帯１０の尾端部１０ａが蛇行量測定装置５を抜けてから制御対象の圧延機Ｆ７を抜けるまでの第２制御区間Ｂにおいては、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重のみに基づいて、制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差を演算する。そして、レベリング制御演算装置６は、演算されたロール開度差を制御対象の圧延機Ｆ７に設けられたレベリング装置２に送出する。
そして、レベリング装置２は、レベリング制御演算装置６から送出されたロール開度差に基づいて、制御対象の圧延機Ｆ７のロール開度差がレベリング制御演算装置６から送出されたロール開度差となるように、制御対象の圧延機Ｆ７の操作側に取り付けられた圧下装置による圧下量と、圧延機Ｆ７の駆動側に取り付けられた圧下装置による圧下量とを調整する。 Further, the leveling control calculation device 6 is controlled in the second control section B from when the tail end portion 10a of the traveling steel strip 10 passes through the meandering amount measuring device 5 to when it passes through the rolling mill F7 to be controlled. Based only on the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided on the rolling mill F7 of the above, the operation side in the rolling mill F7 to be controlled. And the roll opening difference on the drive side is calculated. Then, the leveling control calculation device 6 sends the calculated roll opening difference to the leveling device 2 provided in the rolling mill F7 to be controlled.
Then, in the leveling device 2, based on the roll opening difference sent from the leveling control calculation device 6, the roll opening difference of the rolling mill F7 to be controlled is the roll opening difference sent from the leveling control calculation device 6. Therefore, the amount of reduction by the rolling unit attached to the operation side of the rolling mill F7 to be controlled and the amount of rolling by the rolling unit attached to the drive side of the rolling mill F7 are adjusted.

ここで、鋼帯１０の尾端部１０ａが制御区間Ａ１にあるときのレベリング制御演算装置６によって演算される制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差の目標値は、制御区間Ａ１において、蛇行量測定装置５によって測定される鋼帯１０の蛇行量が０ｍｍとなり、かつ、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められる操作側及び駆動側の差荷重が、尾端部１０ａが制御区間Ａ１の制御開始箇所（圧延機Ｆ５）を抜けたときの、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重となるような制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差とする。 Here, the target value of the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 when the tail end portion 10a of the steel strip 10 is in the control section A1 is set. In the control section A1, the meandering amount of the steel strip 10 measured by the meandering amount measuring device 5 is 0 mm, and the operating side and the driving side detected by the load detector 3 provided in the rolling mill F7 to be controlled. The load detection provided on the rolling mill F7 to be controlled when the difference load between the operation side and the driving side obtained from the rolling load passes through the control start point (rolling mill F5) of the control section A1. The roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled is the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the vessel 3.

また、鋼帯１０の尾端部１０ａが制御区間Ａ２にあるときのレベリング制御演算装置６によって演算される制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差の目標値は、制御区間Ａ２において、蛇行量測定装置５によって測定される鋼帯１０の蛇行量が０ｍｍとなり、かつ、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められる操作側及び駆動側の差荷重が、尾端部１０ａが制御区間Ａ２の制御開始箇所（圧延機Ｆ６）を抜けたときの、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重となるような制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差とする。 Further, the target value of the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 when the tail end portion 10a of the steel strip 10 is in the control section A2 is controlled. In section A2, the amount of meandering of the steel strip 10 measured by the meandering amount measuring device 5 is 0 mm, and rolling on the operation side and the driving side detected by the load detector 3 provided in the rolling mill F7 to be controlled. A load detector provided on the rolling mill F7 to be controlled when the difference load between the operating side and the driving side obtained from the load passes through the control start point (rolling mill F6) of the control section A2. The roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled is the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected in 3.

ここでいう「蛇行量測定装置５によって測定される鋼帯１０の蛇行量が０ｍｍ」とは、熱間圧延機の付帯設備に応じた幅方向のオフセット量を考慮してその蛇行量が０±２０ｍｍ以内であればよいことを意味する。
これにより、各制御区間Ａ１，Ａ２の制御開始時に算出される制御対象の圧延機Ｆ７におけるロール開度差の変更量が大きくなることはなく、鋼帯１０の蛇行挙動が逆転することなく、蛇行挙動をより安定して制御することができる。 Here, "the meandering amount of the steel strip 10 measured by the meandering amount measuring device 5 is 0 mm" means that the meandering amount is 0 ± in consideration of the offset amount in the width direction according to the incidental equipment of the hot rolling mill. It means that it may be within 20 mm.
As a result, the amount of change in the roll opening difference in the rolling mill F7 to be controlled, which is calculated at the start of control of each of the control sections A1 and A2, does not increase, and the meandering behavior of the steel strip 10 does not reverse. The behavior can be controlled more stably.

ここで、鋼帯１０の尾端部１０ａが制御対象の圧延機Ｆ７の２つ上流側の圧延機Ｆ５を抜けた時刻において、制御対象の圧延機より１つ上流側の圧延機Ｆ６と制御対象の圧延機Ｆ７の双方に鋼帯１０は噛み込まれた状態ではあるが、制御対象の圧延機Ｆ７と圧延機Ｆ６との間でも鋼帯１０は多少蛇行する場合がある。このため、第１制御区間Ａを、走行する鋼帯１０の尾端部１０ａが圧延機Ｆ５を抜けてから圧延機Ｆ６を抜けるまでの制御区間Ａ１と、尾端部１０ａが圧延機Ｆ６を抜けてから蛇行量測定装置５を抜けるまでの制御区間Ａ２に分割し各制御区間Ａ１，Ａ２において、制御開始時点から蛇行制御しておくことは有効である。 Here, at the time when the tail end portion 10a of the steel strip 10 passes through the rolling mill F5 on the two upstream sides of the rolling mill F7 to be controlled, the rolling mill F6 one upstream from the rolling mill to be controlled and the rolling mill F6 to be controlled. Although the steel strip 10 is in a state of being bitten into both of the rolling mills F7 of the above, the steel strip 10 may meander slightly between the rolling mill F7 and the rolling mill F6 to be controlled. Therefore, in the first control section A, the control section A1 from when the tail end portion 10a of the steel strip 10 traveling through the rolling mill F5 to when it passes through the rolling mill F6 and the tail end portion 10a pass through the rolling mill F6. It is effective to divide the control section A2 from the time of rolling to exiting the meandering amount measuring device 5 and to control the meandering in each of the control sections A1 and A2 from the start of control.

また、鋼帯１０の尾端部１０ａが第２制御区間Ｂにあるときのレベリング制御演算装置６によって演算される制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差の目標値は、第２制御区間Ｂにおいて、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められる操作側及び駆動側の差荷重が、尾端部１０ａが第２制御区間Ｂの制御開始箇所（蛇行量測定装置５）を抜けたときの、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重となるような制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差とする。
これにより、前述したように、鋼帯１０の蛇行を助長させることなく蛇行挙動を安定して制御することができる。 Further, the target value of the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 when the tail end portion 10a of the steel strip 10 is in the second control section B is In the second control section B, the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided on the rolling mill F7 to be controlled is the tail end portion. Rolling load on the operation side and drive side detected by the load detector 3 provided on the rolling mill F7 to be controlled when 10a passes through the control start point (serpentine amount measuring device 5) in the second control section B. It is the difference in roll opening degree between the operation side and the drive side in the rolling mill F7 to be controlled so that the difference load between the operation side and the drive side is obtained from.
As a result, as described above, the meandering behavior can be stably controlled without promoting the meandering of the steel strip 10.

次に、第２実施形態に係る蛇行制御装置４による処理の流れを図４に示すフローチャートを参照して説明する。
先ず、鋼帯１０の仕上圧延が開始され、鋼帯１０の先端部が制御対象の圧延機Ｆ７を通過したら、ステップＳ１１において、隣り合う圧延機Ｆ６、Ｆ７間に設置された蛇行量測定装置５が走行する鋼帯１０の蛇行量を測定する（蛇行量測定ステップ）。
次いで、ステップＳ１２に移行し、レベリング制御演算装置６は、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から操作側及び駆動側の差荷重を求める（差荷重算出ステップ）。 Next, the flow of processing by the meandering control device 4 according to the second embodiment will be described with reference to the flowchart shown in FIG.
First, the finish rolling of the steel strip 10 is started, and when the tip of the steel strip 10 passes through the rolling mill F7 to be controlled, in step S11, the meandering amount measuring device 5 installed between the adjacent rolling mills F6 and F7. Measures the meandering amount of the steel strip 10 on which the vehicle travels (meandering amount measuring step).
Next, in step S12, the leveling control arithmetic unit 6 changes the difference load between the operation side and the drive side from the rolling load on the operation side and the drive side detected by the load detector 3 provided in the rolling mill F7 to be controlled. (Difference load calculation step).

次いで、ステップＳ１３に移行し、レベリング制御演算装置６は、走行する鋼帯１０の尾端部１０ａが制御開始箇所としての圧延機Ｆ５を抜けてから蛇行量測定装置５を抜けるまでの第１制御区間Ａを２つの制御区間Ａ１，Ａ２に分割した各制御区間Ａ１，Ａ２において、蛇行量測定装置５によって測定された鋼帯１０の蛇行量と、制御対象の圧延機Ｆ７に設けられた荷重検出器３より検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重とに基づいて、制御対象の圧延機Ｆ７における操作側及び駆動側のロールギャップの開度差であるロール開度差を演算し、演算されたロール開度差を制御対象の圧延機Ｆ７に設けられたレベリング装置２に送出する（レベリング制御演算ステップ）。 Next, in step S13, the leveling control calculation device 6 is the first control from the time when the tail end portion 10a of the traveling steel strip 10 passes through the rolling mill F5 as the control start point to the time when it passes through the meandering amount measuring device 5. In each of the control sections A1 and A2 in which the section A is divided into two control sections A1 and A2, the meandering amount of the steel strip 10 measured by the meandering amount measuring device 5 and the load detection provided on the rolling mill F7 to be controlled. Difference in opening degree of roll gap between operation side and drive side in the rolling mill F7 to be controlled based on the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected from the vessel 3. The roll opening difference is calculated, and the calculated roll opening difference is sent to the leveling device 2 provided in the rolling mill F7 to be controlled (leveling control calculation step).

ここで、鋼帯１０の尾端部１０ａが制御区間Ａ１にあるときのレベリング制御演算装置６によって演算される制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差の目標値は、制御区間Ａ１において、蛇行量測定装置５によって測定される鋼帯１０の蛇行量が０ｍｍとなり、かつ、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められる操作側及び駆動側の差荷重が、尾端部１０ａが制御区間Ａ１の制御開始箇所（圧延機Ｆ５）を抜けたときの、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重となるような制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差とする。 Here, the target value of the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 when the tail end portion 10a of the steel strip 10 is in the control section A1 is set. In the control section A1, the meandering amount of the steel strip 10 measured by the meandering amount measuring device 5 is 0 mm, and the operating side and the driving side detected by the load detector 3 provided in the rolling mill F7 to be controlled. The load detection provided on the rolling mill F7 to be controlled when the difference load between the operation side and the driving side obtained from the rolling load passes through the control start point (rolling mill F5) of the control section A1. The roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled is the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the vessel 3.

また、鋼帯１０の尾端部１０ａが制御区間Ａ２にあるときのレベリング制御演算装置６によって演算される制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差の目標値は、制御区間Ａ２において、蛇行量測定装置５によって測定される鋼帯１０の蛇行量が０ｍｍとなり、かつ、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められる操作側及び駆動側の差荷重が、尾端部１０ａが制御区間Ａ２の制御開始箇所（圧延機Ｆ６）を抜けたときの、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重となるような制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差とする。 Further, the target value of the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 when the tail end portion 10a of the steel strip 10 is in the control section A2 is controlled. In section A2, the amount of meandering of the steel strip 10 measured by the meandering amount measuring device 5 is 0 mm, and rolling on the operation side and the driving side detected by the load detector 3 provided in the rolling mill F7 to be controlled. A load detector provided on the rolling mill F7 to be controlled when the difference load between the operating side and the driving side obtained from the load passes through the control start point (rolling mill F6) of the control section A2. The roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled is the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected in 3.

これにより、各制御区間Ａ１，Ａ２の制御開始時に算出される制御対象の圧延機Ｆ７におけるロール開度差の変更量が大きくなることはなく、鋼帯１０の蛇行挙動が逆転することなく、蛇行挙動をより安定して制御することができる。
そして、鋼帯１０の尾端部１０ａが蛇行量測定装置５を抜けたときに第２制御区間Ｂが開始する。レベリング制御演算装置６は、走行する鋼帯１０の尾端部１０ａが蛇行量測定装置５を抜けてから制御対象の圧延機Ｆ７を抜けるまでの第２制御区間Ｂにおいては、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重のみに基づいて、制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差を演算し、演算されたロール開度差を制御対象の圧延機Ｆ７に設けられたレベリング装置２に送出する（レベリング制御演算ステップ）。 As a result, the amount of change in the roll opening difference in the rolling mill F7 to be controlled, which is calculated at the start of control of each of the control sections A1 and A2, does not increase, and the meandering behavior of the steel strip 10 does not reverse. The behavior can be controlled more stably.
Then, the second control section B starts when the tail end portion 10a of the steel strip 10 passes through the meandering amount measuring device 5. The leveling control calculation device 6 is a rolling mill to be controlled in the second control section B from the time when the tail end portion 10a of the traveling steel strip 10 passes through the meandering amount measuring device 5 to the rolling mill F7 to be controlled. Based only on the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided in F7, the operation side and the drive side in the rolling mill F7 to be controlled The roll opening difference is calculated, and the calculated roll opening difference is sent to the leveling device 2 provided in the rolling mill F7 to be controlled (leveling control calculation step).

ここで、鋼帯１０の尾端部１０ａが第２制御区間Ｂにあるときのレベリング制御演算装置６によって演算される制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差の目標値を、第２制御区間Ｂにおいて、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められる操作側及び駆動側の差荷重が、尾端部１０ａが第２制御区間Ｂの制御開始箇所（蛇行量測定装置５）を抜けたときの、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重となるような制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差とする。
これにより、鋼帯１０の蛇行を助長させることなく蛇行挙動を安定して制御することができる。 Here, the target value of the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 when the tail end portion 10a of the steel strip 10 is in the second control section B. In the second control section B, the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided on the rolling mill F7 to be controlled is the tail end. Rolling on the operation side and drive side detected by the load detector 3 provided on the rolling mill F7 to be controlled when the unit 10a passes through the control start point (serpentine amount measuring device 5) of the second control section B. It is the difference in roll opening between the operation side and the drive side in the rolling mill F7 to be controlled so that the difference load between the operation side and the drive side is obtained from the load.
As a result, the meandering behavior can be stably controlled without promoting the meandering of the steel strip 10.

次いで、ステップＳ１４に移行し、レベリング装置２は、レベリング制御演算装置６から送出されたロール開度差に基づいて、制御対象の圧延機Ｆ７のロール開度差がレベリング制御演算装置６から送出されたロール開度差となるように、制御対象の圧延機Ｆ７の操作側に取り付けられた圧下装置による圧下量と、圧延機Ｆ７の駆動側に取り付けられた圧下装置による圧下量とを調整する（圧下量調整ステップ）。
これにより、制御対象の圧延機Ｆ７のレベリング量が、鋼帯１０の尾端部１０ａが第１制御区間Ａ（制御区間Ａ１，Ａ２）にあるときは鋼帯１０の蛇行量及び圧延機Ｆ７の操作側及び駆動側の差荷重に比例して変更され、鋼帯１０の尾端部１０ａが第２制御区間Ｂにあるときは圧延機Ｆ７の操作側及び駆動側の差荷重に比例して変更され、鋼帯１０の蛇行量が抑制される。
これにより、鋼帯１０の蛇行挙動が逆転することなく、蛇行挙動を安定して制御し、可能な限り蛇行量を０ｍｍに近づけて鋼帯１０を通板させることができる。 Next, in step S14, the leveling device 2 sends out the roll opening difference of the rolling mill F7 to be controlled from the leveling control calculation device 6 based on the roll opening difference sent from the leveling control calculation device 6. The amount of rolling by the rolling down device attached to the operation side of the rolling mill F7 to be controlled and the amount of rolling down by the rolling down device attached to the driving side of the rolling mill F7 are adjusted so as to have a difference in roll opening degree ( Rolling amount adjustment step).
As a result, when the leveling amount of the rolling mill F7 to be controlled is such that the tail end portion 10a of the steel strip 10 is in the first control section A (control sections A1 and A2), the meandering amount of the steel strip 10 and the rolling mill F7 It is changed in proportion to the difference load on the operation side and the drive side, and when the tail end portion 10a of the steel strip 10 is in the second control section B, it is changed in proportion to the difference load on the operation side and the drive side of the rolling mill F7. The meandering amount of the steel strip 10 is suppressed.
As a result, the meandering behavior of the steel strip 10 is not reversed, the meandering behavior is stably controlled, and the meandering amount is as close to 0 mm as possible so that the steel strip 10 can be passed through.

以上、本発明の実施形態について説明してきたが、本発明はこれに限定されずに種々の変更、改良を行うことができる。
先ず、第１実施形態及び第２実施形態に係る蛇行制御装置４において、制御対象となる圧延機は上流側から数えて７番目の圧延機Ｆ７としてあるが、蛇行量測定装置５が設置されている位置の下流側直近にある圧延機であれば、圧延機Ｆ７以外の圧延機Ｆ６、圧延機Ｆ５、圧延機Ｆ４などであってもよい。また、制御対象となる圧延機を、圧延機Ｆ７の他に、圧延機Ｆ６、圧延機Ｆ５、圧延機Ｆ４などを加えても良い。 Although the embodiments of the present invention have been described above, the present invention is not limited to this, and various modifications and improvements can be made.
First, in the meandering control device 4 according to the first embodiment and the second embodiment, the rolling mill to be controlled is the seventh rolling mill F7 counting from the upstream side, but the meandering amount measuring device 5 is installed. A rolling mill F6, a rolling mill F5, a rolling mill F4, or the like other than the rolling mill F7 may be used as long as the rolling mill is located closest to the downstream side of the position. Further, as the rolling mill to be controlled, in addition to the rolling mill F7, a rolling mill F6, a rolling mill F5, a rolling mill F4 and the like may be added.

ここで、鋼帯１０の蛇行は、鋼帯１０の尾端部１０ａが圧延機を抜けると、隣り合う圧延機間の張力が失われるため、一般的に最下流の圧延機よりも上流側の圧延機から蛇行制御した方がよい。上流側の圧延機から蛇行制御する場合、上流側の圧延機において鋼帯１０が操作側に蛇行している状況を想定すると、蛇行計方式と差荷重方式のそれぞれの制御目標値が、それぞれ圧延機中央（蛇行量０ｍｍ）、０ｔｏｎｆであれば、制御開始時刻から急激なレベリングを操作するため、前述したように、鋼帯１０の蛇行挙動が逆転してしまう可能性が非常に高い。このため、最下流の圧延機よりも上流側の圧延機から蛇行制御する場合において、第１実施形態のように、蛇行計方式の制御目標値を０ｍｍとし、かつ、差荷重方式の制御目標値を制御開始時の差荷重とする。 Here, the meandering of the steel strip 10 is generally on the upstream side of the most downstream rolling mill because the tension between the adjacent rolling mills is lost when the tail end portion 10a of the steel strip 10 passes through the rolling mill. It is better to control meandering from the rolling mill. When meandering control is performed from the upstream rolling mill, assuming that the steel strip 10 meanders to the operation side in the upstream rolling mill, the control target values of the meandering meter method and the differential load method are each rolled. If the center of the machine (meandering amount is 0 mm) and 0 tonf, abrupt leveling is operated from the control start time, so that there is a very high possibility that the meandering behavior of the steel strip 10 will be reversed as described above. Therefore, in the case of meandering control from the rolling mill on the upstream side of the most downstream rolling mill, the control target value of the meandering meter method is set to 0 mm and the control target value of the differential load method is set as in the first embodiment. Is the differential load at the start of control.

また、第１実施形態及び第２実施形態に係る蛇行制御装置４において、圧延機の数が７つであるが、この圧延機の数は７つ以外であってもよい。
また、第１実施形態に係る蛇行制御装置４において、第１制御区間Ａの制御開始箇所は、制御対象となる圧延機Ｆ７よりひとつ前の圧延機Ｆ６としてあるが、第１制御区間Ａの制御開始箇所として蛇行量測定装置５より上流側の鋼帯の搬送ライン上の任意の所定箇所であればよく、第２実施形態のように、圧延機Ｆ７よりふたつ前の圧延機Ｆ５や圧延機Ｆ７より三つ前の圧延機Ｆ４などとしてもよい。
また、第２実施形態に係る蛇行制御装置４において、第１制御区間Ａの制御開始箇所は、制御対象となる圧延機Ｆ７よりふたつ前の圧延機Ｆ５としてあるが、第１制御区間Ａの制御開始箇所として蛇行量測定装置５より上流側の鋼帯の搬送ライン上の任意の所定箇所であればよく、圧延機Ｆ７より三つ前の圧延機Ｆ４や圧延機Ｆ７より四つ前の圧延機Ｆ３などとしてもよい。 Further, in the meandering control device 4 according to the first embodiment and the second embodiment, the number of rolling mills is seven, but the number of rolling mills may be other than seven.
Further, in the meandering control device 4 according to the first embodiment, the control start location of the first control section A is the rolling mill F6, which is one before the rolling mill F7 to be controlled, but the control of the first control section A is performed. The starting point may be any predetermined position on the transport line of the steel strip on the upstream side of the meandering amount measuring device 5, and as in the second embodiment, the rolling mill F5 and the rolling mill F7 two before the rolling mill F7. It may be a rolling mill F4 or the like three years before.
Further, in the meandering control device 4 according to the second embodiment, the control start location of the first control section A is the rolling mill F5 two before the rolling mill F7 to be controlled, but the control of the first control section A is performed. The starting point may be any predetermined position on the transport line of the steel strip on the upstream side of the meandering amount measuring device 5, and the rolling mill F4 three before the rolling mill F7 and the rolling mill four four before the rolling mill F7. It may be F3 or the like.

そして、第２実施形態に係る蛇行制御装置４において、第１制御区間Ａを、２つの制御区間Ａ１，Ａ２に分割しているが、第１制御区間Ａの分割数は２つに限らず、３つ以上であってもよい。この場合、レベリング制御演算装置６によって演算される制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差の目標値を、各制御区間において、蛇行量測定装置５によって測定される鋼帯１０の蛇行量が０ｍｍとなり、かつ、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められる操作側及び駆動側の差荷重が、尾端部１０ａが各制御区間の制御開始箇所を抜けたときの、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重となるような制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差とすることが好ましい。 Then, in the meandering control device 4 according to the second embodiment, the first control section A is divided into two control sections A1 and A2, but the number of divisions of the first control section A is not limited to two. There may be three or more. In this case, the target value of the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 is measured by the meandering amount measuring device 5 in each control section. The meandering amount of 10 is 0 mm, and the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided in the rolling mill F7 to be controlled is the tail. The operation side and the operation side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided on the rolling mill F7 to be controlled when the end portion 10a passes through the control start point of each control section. It is preferable that the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled is such that the load is different on the drive side.

本発明者らは、比較例１及び実施例１に係る蛇行制御装置を備えた仕上圧延設備１を用いて鋼帯１０を仕上圧延し、それぞれについて鋼帯１０の蛇行量を測定した。鋼帯１０の幅は１２００ｍｍ、仕上圧延設備１の入側の鋼帯１０の板厚は２１ｍｍ、仕上圧延設備１の出側の鋼帯１０の板厚は２ｍｍとした。また、鋼帯１０の材質は、低炭素鋼とした。
比較例１に係る蛇行制御装置及び実施例１に係る蛇行制御装置とも図１に示す蛇行制御装置とし、レベリング制御演算装置６が、走行する鋼帯１０の尾端部１０ａが制御開始箇所としての圧延機Ｆ６を抜けてから蛇行量測定装置５を抜けるまでの第１制御区間Ａにおいて、蛇行量測定装置５によって測定された鋼帯１０の蛇行量と、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重とに基づいて、制御対象の圧延機Ｆ７における操作側及び駆動側のロールギャップの開度差であるロール開度差を演算し、演算されたロール開度差を制御対象の圧延機Ｆ７に設けられたレベリング装置２に送出し、レベリング装置２で圧下量の調整を行った。 The present inventors finished-rolled the steel strip 10 using the finishing rolling equipment 1 equipped with the meandering control device according to Comparative Example 1 and Example 1, and measured the meandering amount of the steel strip 10 for each. The width of the steel strip 10 was 1200 mm, the plate thickness of the steel strip 10 on the entry side of the finish rolling equipment 1 was 21 mm, and the plate thickness of the steel strip 10 on the exit side of the finish rolling equipment 1 was 2 mm. The material of the steel strip 10 was low carbon steel.
Both the meandering control device according to Comparative Example 1 and the meandering control device according to the first embodiment are the meandering control devices shown in FIG. 1, and the leveling control calculation device 6 uses the tail end portion 10a of the traveling steel strip 10 as the control start point. In the first control section A from passing through the rolling mill F6 to passing through the meandering amount measuring device 5, the meandering amount of the steel strip 10 measured by the meandering amount measuring device 5 and the rolling mill F7 to be controlled are provided. Opening of roll gaps on the operation side and the drive side in the rolling mill F7 to be controlled based on the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3. The roll opening difference, which is a degree difference, was calculated, and the calculated roll opening difference was sent to the leveling device 2 provided in the rolling mill F7 to be controlled, and the rolling reduction amount was adjusted by the leveling device 2.

また、比較例１に係る蛇行制御装置及び実施例１に係る蛇行制御装置のレベリング制御演算装置６が、走行する鋼帯１０の尾端部１０ａが蛇行量測定装置５を抜けてから制御対象の圧延機Ｆ７を抜けるまでの第２制御区間Ｂにおいて、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重に基づいて、制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差を演算し、演算されたロール開度差を制御対象の圧延機Ｆ７に設けられたレベリング装置２に送出し、レベリング装置２で圧下量の調整を行った。 Further, the leveling control calculation device 6 of the meandering control device according to Comparative Example 1 and the meandering control device according to Example 1 is controlled after the tail end portion 10a of the traveling steel strip 10 has passed through the meandering amount measuring device 5. In the second control section B until passing through the rolling mill F7, the operating side and the driving side obtained from the rolling load on the operating side and the driving side detected by the load detector 3 provided on the rolling mill F7 to be controlled. The roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled is calculated based on the differential load, and the calculated roll opening difference is sent to the leveling device 2 provided in the rolling mill F7 to be controlled. Then, the rolling reduction amount was adjusted by the leveling device 2.

比較例１に係る蛇行制御装置のレベリング制御演算装置６によって演算される制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差の目標値は、表１に示すように、第１制御区間Ａにおいて、蛇行量測定装置５によって測定される鋼帯１０の蛇行量が０ｍｍとなり、かつ、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められる操作側及び駆動側の差荷重が０ｔｏｎｆとなるような制御対象の操作側及び駆動側のロール開度差とした。
また、比較例１に係る蛇行制御装置のレベリング制御演算装置６によって演算される制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差の目標値は、表１に示すように、第２制御区間Ｂにおいて、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められる操作側及び駆動側の差荷重が０ｔｏｎｆとなるような制御対象の操作側及び駆動側のロール開度差とした。 As shown in Table 1, the target value of the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 of the meandering control device according to Comparative Example 1 is the first control. In section A, the meandering amount of the steel strip 10 measured by the meandering amount measuring device 5 is 0 mm, and rolling on the operation side and the driving side detected by the load detector 3 provided in the rolling mill F7 to be controlled. The difference in roll opening between the operating side and the driving side of the controlled object such that the difference load between the operating side and the driving side obtained from the load is 0 tonf is used.
Further, as shown in Table 1, the target value of the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 of the meandering control device according to Comparative Example 1 is the first. 2 In the control section B, the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided in the rolling mill F7 to be controlled is 0 tonf. The difference in roll opening between the operation side and the drive side of the target was used.

一方、実施例１に係る蛇行制御装置のレベリング制御演算装置６によって演算される制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差の目標値は、表１に示すように、第１制御区間Ａにおいて、蛇行量測定装置５によって測定される鋼帯１０の蛇行量が０ｍｍとなり、かつ、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められる操作側及び駆動側の差荷重が、尾端部１０ａが第１制御区間Ａの制御開始箇所を抜けたときの、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重である２７ｔｏｎｆとなるような制御対象の圧延機Ｆ７の操作側及び駆動側のロール開度差とした。 On the other hand, as shown in Table 1, the target value of the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 of the meandering control device according to the first embodiment is the first. In 1 control section A, the meandering amount of the steel strip 10 measured by the meandering amount measuring device 5 is 0 mm, and the operation side and the driving side detected by the load detector 3 provided in the rolling mill F7 to be controlled. The load detector 3 provided on the rolling mill F7 to be controlled when the tail end portion 10a passes through the control start portion of the first control section A as the difference load between the operation side and the drive side obtained from the rolling load of The roll opening difference between the operation side and the drive side of the rolling mill F7 to be controlled is set to 27 tonf, which is the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by. ..

また、実施例１に係る蛇行制御装置のレベリング制御演算装置６によって演算される制御対象の圧延機Ｆ７における操作側及び駆動側のロール開度差の目標値は、表１に示すように、第２制御区間Ｂにおいて、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められる操作側及び駆動側の差荷重が、尾端部１０ａが第２制御区間Ｂの制御開始箇所を抜けたときの、制御対象の圧延機Ｆ７に設けられた荷重検出器３により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重である１２ｔｏｎｆとなるような制御対象の圧延機Ｆ７の操作側及び駆動側のロール開度差とした。 Further, as shown in Table 1, the target value of the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled calculated by the leveling control calculation device 6 of the meandering control device according to the first embodiment is the first. 2 In the control section B, the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided on the rolling mill F7 to be controlled is the difference load between the operation side and the drive side. The operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector 3 provided in the rolling mill F7 to be controlled when the control start point of the second control section B is passed. The roll opening difference between the operation side and the drive side of the rolling mill F7 to be controlled so as to have a difference load of 12 tonf.

表１に、比較例１及び実施例１に係る蛇行制御装置の制御目標値と蛇行制御結果とを示す。また、図５に、比較例１及び実施例１に係る蛇行制御装置で蛇行制御を行った場合の圧延機Ｆ７での蛇行量の時間変化を示す。
なお、鋼帯１０が操作側に蛇行した時の鋼帯１０の蛇行量を「＋」、鋼帯１０が駆動側に蛇行した時の鋼帯１０の蛇行量を「−」としている。また、差荷重は、圧延機Ｆ７の操作側の圧延荷重から駆動側の圧延荷重を引いた値である。
また、図５において、Ｔ１は鋼帯１０の尾端部１０ａが圧延機Ｆ６を抜けたときの時刻、Ｔ２は鋼帯１０の尾端部１０ａが圧延機Ｆ７を抜けたときの時刻を示す。 Table 1 shows the control target values and the meandering control results of the meandering control device according to Comparative Example 1 and Example 1. Further, FIG. 5 shows the time change of the meandering amount in the rolling mill F7 when the meandering control is performed by the meandering control device according to Comparative Example 1 and Example 1.
The amount of meandering of the steel strip 10 when the steel strip 10 meanders to the operation side is "+", and the amount of meandering of the steel strip 10 when the steel strip 10 meanders to the drive side is "-". The differential load is a value obtained by subtracting the rolling load on the driving side from the rolling load on the operating side of the rolling mill F7.
Further, in FIG. 5, T1 indicates the time when the tail end portion 10a of the steel strip 10 passes through the rolling mill F6, and T2 indicates the time when the tail end portion 10a of the steel strip 10 passes through the rolling mill F7.

Figure 2021016889
Figure 2021016889

比較例１に係る蛇行制御装置で前述の制御目標値で蛇行制御を行った結果、圧延機Ｆ７抜け時の鋼帯１０の蛇行量は、目標値が０ｍｍであるのに対して−４６ｍｍであり、蛇行挙動を逆転させている。
一方、実施例１に係る蛇行制御装置で前述の制御目標値で蛇行制御を行った場合、圧延機Ｆ７抜け時の鋼帯１０の蛇行量は、目標値が０ｍｍであるのに対して２６ｍｍであり、蛇行挙動は安定している。 As a result of performing meandering control with the above-mentioned control target value by the meandering control device according to Comparative Example 1, the meandering amount of the steel strip 10 when the rolling mill F7 is pulled out is -46 mm, while the target value is 0 mm. , The meandering behavior is reversed.
On the other hand, when the meandering control device according to the first embodiment performs meandering control with the above-mentioned control target value, the meandering amount of the steel strip 10 when the rolling mill F7 is pulled out is 26 mm, while the target value is 0 mm. Yes, the meandering behavior is stable.

これにより、本発明に係る蛇行制御装置及び蛇行制御方法を用いれば、鋼帯１０の蛇行抑制効果は十分得られ、かつ蛇行挙動を逆転させる不安定な制御になることはない安定した蛇行制御が実施可能となることが確認された。 As a result, if the meandering control device and the meandering control method according to the present invention are used, the meandering suppressing effect of the steel strip 10 can be sufficiently obtained, and stable meandering control that does not result in unstable control that reverses the meandering behavior can be achieved. It was confirmed that it could be implemented.

１ 仕上圧延設備
２ レベリング装置
３ 荷重検出器
４ 蛇行制御装置
５ 蛇行量測定装置
６ レベリング制御演算装置
１０ 熱間圧延鋼帯
１０ａ 尾端部
Ｆ１〜Ｆ７ 圧延機
1 Finish rolling equipment 2 Leveling device 3 Load detector 4 Serpentine control device 5 Serpentine amount measuring device 6 Leveling control arithmetic unit 10 Hot-rolled steel strip 10a Tail end F1 to F7 Rolling machine

Claims (7)

操作側及び駆動側の圧延荷重を検出する荷重検出器と、操作側及び駆動側の圧下量を調整するレベリング装置とをそれぞれが有する複数の圧延機を備えた仕上圧延設備で圧延される熱間圧延鋼帯の蛇行を制御する熱間圧延鋼帯の蛇行制御方法であって、
隣り合う圧延機間に設置された蛇行量測定装置により、走行する熱間圧延鋼帯の蛇行量を測定する蛇行量測定ステップと、
レベリング制御演算装置により、前記蛇行量測定装置が設置されている位置の下流側直近にある制御対象の圧延機に設けられた荷重検出器により検出された操作側及び駆動側の圧延荷重から操作側及び駆動側の差荷重を求める差荷重算出ステップと、
レベリング制御演算装置により、走行する前記熱間圧延鋼帯の尾端部が制御開始箇所としての前記熱間圧延鋼帯の搬送ライン上の所定箇所を抜けてから前記蛇行量測定装置を抜けるまでの第１制御区間において、前記蛇行量測定装置によって測定された前記熱間圧延鋼帯の蛇行量と、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重とに基づいて、前記制御対象の圧延機における操作側及び駆動側のロールギャップの開度差であるロール開度差を演算し、前記熱間圧延鋼帯の尾端部が前記蛇行量測定装置を抜けてから前記制御対象の圧延機を抜けるまでの第２制御区間において、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重に基づいて、前記制御対象の圧延機における操作側及び駆動側のロール開度差を演算するレベリング制御演算ステップとを含み、
前記レベリング制御演算ステップによって演算される前記制御対象の圧延機における操作側及び駆動側のロール開度差の目標値を、前記第１制御区間において、前記蛇行量測定装置によって測定される前記熱間圧延鋼帯の蛇行量が０ｍｍとなり、かつ、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められる操作側及び駆動側の差荷重が、前記尾端部が前記第１制御区間の制御開始箇所を抜けたときの、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重となるような前記制御対象の圧延機の操作側及び駆動側のロール開度差とし、前記第２制御区間において、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められる操作側及び駆動側の差荷重が、前記尾端部が前記第２制御区間の制御開始箇所を抜けたときの、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重となるような前記制御対象の圧延機の操作側及び駆動側のロール開度差とすることを特徴とする熱間圧延鋼帯の蛇行制御方法。 Hot rolled in a finishing rolling facility equipped with a plurality of rolling mills each having a load detector for detecting rolling loads on the operation side and the drive side and a leveling device for adjusting the rolling amount on the operation side and the drive side. A method for controlling the meandering of a hot-rolled steel strip, which controls the meandering of a rolled steel strip.
A meandering amount measuring step for measuring the meandering amount of a running hot-rolled steel strip by a meandering amount measuring device installed between adjacent rolling mills,
From the rolling load on the operating side and the driving side detected by the load detector installed in the rolling mill to be controlled near the downstream side of the position where the meandering amount measuring device is installed by the leveling control arithmetic unit, the operating side And the differential load calculation step to obtain the differential load on the drive side,
From the time when the tail end of the traveling hot-rolled steel strip passes through a predetermined position on the transport line of the hot-rolled steel strip as a control start point to the time when the meandering amount measuring device is passed by the leveling control calculation device. In the first control section, the meandering amount of the hot-rolled steel strip measured by the meandering amount measuring device and the operation side and the driving side detected by the load detector provided in the rolling mill to be controlled. Based on the difference load between the operation side and the drive side obtained from the rolling load, the roll opening difference, which is the difference in the opening of the roll gap between the operation side and the drive side in the rolling mill to be controlled, is calculated, and the heat is calculated. In the second control section from when the tail end of the inter-rolled steel strip passes through the meandering amount measuring device to when it passes through the rolling mill to be controlled, it is detected by the load detector provided in the rolling mill to be controlled. Leveling control calculation step for calculating the roll opening difference between the operation side and the drive side in the rolling mill to be controlled based on the difference load between the operation side and the drive side obtained from the rolled rolling load on the operation side and the drive side. Including and
The target value of the roll opening difference between the operation side and the drive side in the rolling mill to be controlled, which is calculated by the leveling control calculation step, is measured by the meandering amount measuring device in the first control section. The meandering amount of the rolled steel strip is 0 mm, and the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector provided in the rolling mill to be controlled is , Obtained from the rolling load on the operation side and the driving side detected by the load detector provided in the rolling mill to be controlled when the tail end portion passes through the control start portion of the first control section. The roll opening difference between the operating side and the driving side of the rolling mill to be controlled is such that the load is different between the operating side and the driving side, and the rolling mill provided in the rolling mill to be controlled in the second control section. The control when the difference load on the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector passes through the control start portion of the second control section. The operating side of the rolling mill to be controlled and the difference load between the operating side and the driving side obtained from the rolling load on the operating side and the driving side detected by the load detector provided on the target rolling mill. A method for controlling meandering of a hot-rolled steel strip, which comprises a difference in roll opening on the drive side. 前記第１制御区間の制御開始箇所である前記熱間圧延鋼帯の搬送ライン上の所定箇所は、前記蛇行量測定装置が設置されている位置の上流側直近にある圧延機であることを特徴とする請求項１に記載の熱間圧延鋼帯の蛇行制御方法。 The predetermined location on the transport line of the hot-rolled steel strip, which is the control start location of the first control section, is a rolling mill located immediately upstream of the position where the meandering amount measuring device is installed. The meandering control method for a hot-rolled steel strip according to claim 1. 操作側及び駆動側の圧延荷重を検出する荷重検出器と、操作側及び駆動側の圧下量を調整するレベリング装置とをそれぞれが有する複数の圧延機を備えた仕上圧延設備で圧延される熱間圧延鋼帯の蛇行を制御する熱間圧延鋼帯の蛇行制御方法であって、
隣り合う圧延機間に設置された蛇行量測定装置により、走行する熱間圧延鋼帯の蛇行量を測定する蛇行量測定ステップと、
レベリング制御演算装置により、前記蛇行量測定装置が設置されている位置の下流側直近にある制御対象の圧延機に設けられた荷重検出器により検出された操作側及び駆動側の圧延荷重から操作側及び駆動側の差荷重を求める差荷重算出ステップと、
レベリング制御演算装置により、走行する前記熱間圧延鋼帯の尾端部が制御開始箇所としての前記熱間圧延鋼帯の搬送ライン上の所定箇所を抜けてから前記蛇行量測定装置を抜けるまでの第１制御区間を複数に分割した各制御区間において、前記蛇行量測定装置によって測定された前記熱間圧延鋼帯の蛇行量と、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重とに基づいて、前記制御対象の圧延機における操作側及び駆動側のロールギャップの開度差であるロール開度差を演算し、前記熱間圧延鋼帯の尾端部が前記蛇行量測定装置を抜けてから前記制御対象の圧延機を抜けるまでの第２制御区間において、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重に基づいて、前記制御対象の圧延機における操作側及び駆動側のロール開度差を演算するレベリング制御演算ステップとを含み、
前記レベリング制御演算ステップによって演算される前記制御対象の圧延機における操作側及び駆動側のロール開度差の目標値を、前記各制御区間において、前記蛇行量測定装置によって測定される前記熱間圧延鋼帯の蛇行量が０ｍｍとなり、かつ、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められる操作側及び駆動側の差荷重が、前記尾端部が前記各制御区間の制御開始箇所を抜けたときの、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重となるような前記制御対象の圧延機の操作側及び駆動側のロール開度差とし、前記第２制御区間において、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められる操作側及び駆動側の差荷重が、前記尾端部が前記第２制御区間の制御開始箇所を抜けたときの、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重となるような前記制御対象の圧延機の操作側及び駆動側のロール開度差とすることを特徴とする熱間圧延鋼帯の蛇行制御方法。 Hot rolled in a finishing rolling facility equipped with a plurality of rolling mills each having a load detector for detecting rolling loads on the operation side and the drive side and a leveling device for adjusting the rolling amount on the operation side and the drive side. A method for controlling the meandering of a hot-rolled steel strip, which controls the meandering of a rolled steel strip.
A meandering amount measuring step for measuring the meandering amount of a running hot-rolled steel strip by a meandering amount measuring device installed between adjacent rolling mills,
From the rolling load on the operating side and the driving side detected by the load detector installed in the rolling mill to be controlled near the downstream side of the position where the meandering amount measuring device is installed by the leveling control arithmetic unit, the operating side And the differential load calculation step to obtain the differential load on the drive side,
From the time when the tail end of the traveling hot-rolled steel strip passes through a predetermined position on the transport line of the hot-rolled steel strip as a control start point to the time when the meandering amount measuring device is passed by the leveling control calculation device. In each control section obtained by dividing the first control section into a plurality of parts, the meandering amount of the hot-rolled steel strip measured by the meandering amount measuring device and the load detector provided in the rolling mill to be controlled detect it. Roll opening, which is the difference in the opening degree of the roll gap between the operation side and the drive side in the rolling mill to be controlled, based on the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side. The degree difference is calculated, and the tail end portion of the hot-rolled steel strip is provided in the controlled rolling mill in the second control section from passing through the meandering amount measuring device to passing through the controlled rolling mill. Based on the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector, the roll opening degree on the operation side and the drive side in the rolling mill to be controlled. Includes a leveling control calculation step to calculate the difference
The target value of the roll opening difference between the operation side and the drive side in the rolling mill to be controlled, which is calculated by the leveling control calculation step, is measured by the meandering amount measuring device in each control section. The meandering amount of the steel strip is 0 mm, and the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector provided in the rolling mill to be controlled is The operation obtained from the rolling load on the operation side and the driving side detected by the load detector provided in the rolling mill to be controlled when the tail end portion passes through the control start portion of each control section. The roll opening difference between the operating side and the driving side of the rolling mill to be controlled so as to be a difference load between the side and the driving side, and the load detection provided in the rolling mill to be controlled in the second control section. The control target when the difference load on the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the device passes through the control start portion of the second control section. The operating side and the driving side of the rolling mill to be controlled so that the difference load between the operating side and the driving side obtained from the rolling load on the operating side and the driving side detected by the load detector provided on the rolling mill is obtained. A method for controlling meandering of a hot-rolled steel strip, which is characterized by a difference in roll opening. 操作側及び駆動側の圧延荷重を検出する荷重検出器と、操作側及び駆動側の圧下量を調整するレベリング装置とをそれぞれが有する複数の圧延機を備えた仕上圧延設備で圧延される熱間圧延鋼帯の蛇行を制御する熱間圧延鋼帯の蛇行制御装置であって、
隣り合う圧延機間に設置された、走行する熱間圧延鋼帯の蛇行量を測定する蛇行量測定装置と、
走行する前記熱間圧延鋼帯の尾端部が制御開始箇所としての前記熱間圧延鋼帯の搬送ライン上の所定箇所を抜けてから前記蛇行量測定装置を抜けるまでの第１制御区間において、前記蛇行量測定装置によって測定された前記熱間圧延鋼帯の蛇行量と、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重とに基づいて、前記制御対象の圧延機における操作側及び駆動側のロールギャップの開度差であるロール開度差を演算し、前記熱間圧延鋼帯の尾端部が前記蛇行量測定装置を抜けてから前記制御対象の圧延機を抜けるまでの第２制御区間において、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重に基づいて、前記制御対象の圧延機における操作側及び駆動側のロール開度差を演算するレベリング制御演算装置とを備え、
該レベリング制御演算装置によって演算される前記制御対象の圧延機における操作側及び駆動側のロール開度差の目標値を、前記第１制御区間において、前記蛇行量測定装置によって測定される前記熱間圧延鋼帯の蛇行量が０ｍｍとなり、かつ、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められる操作側及び駆動側の差荷重が、前記尾端部が前記第１制御区間の制御開始箇所を抜けたときの、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重となるような前記制御対象の圧延機の操作側及び駆動側のロール開度差とし、前記第２制御区間において、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められる操作側及び駆動側の差荷重が、前記尾端部が前記第２制御区間の制御開始箇所を抜けたときの、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重となるような前記制御対象の圧延機の操作側及び駆動側のロール開度差とすることを特徴とする熱間圧延鋼帯の蛇行制御装置。 Hot rolled by a finishing rolling equipment equipped with a plurality of rolling mills each having a load detector for detecting the rolling load on the operation side and the drive side and a leveling device for adjusting the rolling amount on the operation side and the drive side. A hot-rolled steel strip serpentine control device that controls the meandering of rolled steel strips.
A meandering amount measuring device installed between adjacent rolling mills to measure the meandering amount of a running hot-rolled steel strip,
In the first control section from when the tail end of the traveling hot-rolled steel strip passes through a predetermined position on the transport line of the hot-rolled steel strip as a control start point to when it passes through the meandering amount measuring device. It was obtained from the meandering amount of the hot-rolled steel strip measured by the meandering amount measuring device and the rolling loads on the operation side and the driving side detected by the load detector provided in the rolling mill to be controlled. Based on the difference load between the operation side and the drive side, the roll opening difference, which is the difference in the opening of the roll gap between the operation side and the drive side in the rolling mill to be controlled, is calculated, and the tail of the hot rolled steel strip is calculated. In the second control section from when the end portion passes through the meandering amount measuring device to when it passes through the rolling mill to be controlled, the operation side and the drive detected by the load detector provided in the rolling mill to be controlled. A leveling control calculation device for calculating the roll opening difference between the operation side and the drive side in the rolling mill to be controlled is provided based on the difference load between the operation side and the drive side obtained from the rolling load on the side.
The target value of the roll opening difference between the operation side and the drive side in the rolling mill to be controlled, which is calculated by the leveling control calculation device, is measured by the meandering amount measuring device in the first control section. The meandering amount of the rolled steel strip is 0 mm, and the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector provided in the rolling mill to be controlled is , Obtained from the rolling load on the operation side and the driving side detected by the load detector provided in the rolling mill to be controlled when the tail end portion passes through the control start portion of the first control section. The roll opening difference between the operating side and the driving side of the rolling mill to be controlled is such that the load is different between the operating side and the driving side, and the rolling mill provided in the rolling mill to be controlled in the second control section. The control when the difference load on the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector passes through the control start portion of the second control section. The operating side of the rolling mill to be controlled and the difference load between the operating side and the driving side obtained from the rolling load on the operating side and the driving side detected by the load detector provided on the target rolling mill. A meandering control device for hot-rolled steel strips, characterized by a difference in roll opening on the drive side. 前記第１制御区間の制御開始箇所である前記熱間圧延鋼帯の搬送ライン上の所定箇所は、前記蛇行量測定装置が設置されている位置の上流側直近にある圧延機であることを特徴とする請求項４に記載の熱間圧延鋼帯の蛇行制御装置。 The predetermined location on the transport line of the hot-rolled steel strip, which is the control start location of the first control section, is a rolling mill located immediately upstream of the position where the meandering amount measuring device is installed. The meandering control device for a hot-rolled steel strip according to claim 4. 操作側及び駆動側の圧延荷重を検出する荷重検出器と、操作側及び駆動側の圧下量を調整するレベリング装置とをそれぞれが有する複数の圧延機を備えた仕上圧延設備で圧延される熱間圧延鋼帯の蛇行を制御する熱間圧延鋼帯の蛇行制御装置であって、
隣り合う圧延機間に設置された、走行する熱間圧延鋼帯の蛇行量を測定する蛇行量測定装置と、
走行する前記熱間圧延鋼帯の尾端部が制御開始箇所としての前記熱間圧延鋼帯の搬送ライン上の所定箇所を抜けてから前記蛇行量測定装置を抜けるまでの第１制御区間を複数に分割した各制御区間において、前記蛇行量測定装置によって測定された前記熱間圧延鋼帯の蛇行量と、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重とに基づいて、前記制御対象の圧延機における操作側及び駆動側のロールギャップの開度差であるロール開度差を演算し、前記熱間圧延鋼帯の尾端部が前記蛇行量測定装置を抜けてから前記制御対象の圧延機を抜けるまでの第２制御区間において、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重に基づいて、前記制御対象の圧延機における操作側及び駆動側のロール開度差を演算するレベリング制御演算とを備え、
該レベリング制御演算装置によって演算される前記制御対象の圧延機における操作側及び駆動側のロール開度差の目標値を、前記各制御区間において、前記蛇行量測定装置によって測定される前記熱間圧延鋼帯の蛇行量が０ｍｍとなり、かつ、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められる操作側及び駆動側の差荷重が、前記尾端部が前記各制御区間の制御開始箇所を抜けたときの、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重となるような前記制御対象の圧延機の操作側及び駆動側のロール開度差とし、前記第２制御区間において、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められる操作側及び駆動側の差荷重が、前記尾端部が前記第２制御区間の制御開始箇所を抜けたときの、前記制御対象の圧延機に設けられた前記荷重検出器により検出された操作側及び駆動側の圧延荷重から求められた操作側及び駆動側の差荷重となるような前記制御対象の圧延機の操作側及び駆動側のロール開度差とすることを特徴とする熱間圧延鋼帯の蛇行制御装置。 Hot rolled by a finishing rolling equipment equipped with a plurality of rolling mills each having a load detector for detecting the rolling load on the operation side and the drive side and a leveling device for adjusting the rolling amount on the operation side and the drive side. A hot-rolled steel strip serpentine control device that controls the meandering of rolled steel strips.
A meandering amount measuring device installed between adjacent rolling mills to measure the meandering amount of a running hot-rolled steel strip,
A plurality of first control sections from when the tail end of the traveling hot-rolled steel strip passes through a predetermined position on the transport line of the hot-rolled steel strip as a control start point to when it passes through the meandering amount measuring device. In each control section divided into, the meandering amount of the hot-rolled steel strip measured by the meandering amount measuring device, and the operation side and the drive detected by the load detector provided in the rolling mill to be controlled. Based on the difference load between the operation side and the drive side obtained from the rolling load on the side, the roll opening difference, which is the opening difference between the roll gaps on the operation side and the drive side in the rolling mill to be controlled, is calculated. In the second control section from when the tail end of the hot-rolled steel strip passes through the meandering amount measuring device to when it passes through the rolling mill to be controlled, the load detector provided in the rolling mill to be controlled Leveling control that calculates the roll opening difference between the operation side and the drive side in the rolling mill to be controlled based on the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by With arithmetic
The target value of the roll opening difference between the operation side and the drive side in the rolling mill to be controlled, which is calculated by the leveling control calculation device, is measured by the meandering amount measuring device in each control section. The meandering amount of the steel strip is 0 mm, and the difference load between the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the load detector provided in the rolling mill to be controlled is The operation obtained from the rolling load on the operation side and the driving side detected by the load detector provided in the rolling mill to be controlled when the tail end portion passes through the control start portion of each control section. The roll opening difference between the operating side and the driving side of the rolling mill to be controlled so as to be a difference load between the side and the driving side, and the load detection provided in the rolling mill to be controlled in the second control section. The control target when the difference load on the operation side and the drive side obtained from the rolling load on the operation side and the drive side detected by the device passes through the control start portion of the second control section. The operating side and the driving side of the rolling mill to be controlled so that the difference load between the operating side and the driving side obtained from the rolling load on the operating side and the driving side detected by the load detector provided on the rolling mill is obtained. A meandering control device for hot-rolled steel strips, which is characterized by a difference in roll opening. 請求項４乃至６のうちいずれか一項に記載の熱間圧延鋼帯の蛇行制御装置を有することを特徴とする熱間圧延設備。 A hot rolling facility comprising the meandering control device for a hot rolled steel strip according to any one of claims 4 to 6.
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