JP2021016888A - 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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JP2021016888A
JP2021016888A JP2019134681A JP2019134681A JP2021016888A JP 2021016888 A JP2021016888 A JP 2021016888A JP 2019134681 A JP2019134681 A JP 2019134681A JP 2019134681 A JP2019134681 A JP 2019134681A JP 2021016888 A JP2021016888 A JP 2021016888A
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control
load
rolling
drive
rolling mill
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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
高嶋 由紀雄
Yukio Takashima
由紀雄 高嶋
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JFE Steel Corp
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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 measured by a meandering amount measuring device 5 becomes a meandering amount of the time when a tail end part 10a passes through a control start spot of a first control section A, in a first control section A where the tail end part 10a of a traveling steel strip 10 passes through the control start spot (a rolling mill F6) and then passes through the meandering amount measuring device 5; and a difference load between the operation side and the drive side of the control target rolling mill F7 becomes a difference load between the operation side and the drive side of the rolling mill F7 of the time when the tail end part 10a passes through the control start spot of the first control section A.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するためには制御目標値を適切に設定する必要がある。
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することができる、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。
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.
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. An object of the present invention is to provide a meandering control method for a hot-rolled steel strip, a meandering control device, and a hot-rolling facility that can be stably controlled.

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、演算されたロール開度差を前記制御対象の圧延機に設けられた前記レベリング装置に送出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、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 calculated roll opening difference is calculated. Is included in the leveling control calculation step that is sent to the leveling device provided in the rolling mill to be controlled, and the roll opening degree on the operation side and the driving side in the rolling mill to be controlled is calculated by the leveling control calculation step. The target value of the difference was determined by the meandering amount of the hot-rolled steel strip measured by the meandering amount measuring device in the first control section, and the tail end portion passed through the control start point of the first control section. The rolling load on the operation side and the driving side, which is the meandering amount of the hot-rolled steel strip measured by the meandering amount measuring device and is detected by the load detector provided in the rolling mill to be controlled. The difference load between the operation side and the drive side obtained from the above is 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 gist is that the roll opening difference between the operation side and the drive side of the rolling mill 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.

また、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制御区間を複数の制御区間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、演算されたロール開度差を前記制御対象の圧延機に設けられた前記レベリング装置に送出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、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 method for controlling the 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 operation side and the drive side, and a leveling device that adjusts the reduction amount on the operation side and the drive side. This is a method for controlling the meandering of a hot-rolled steel strip that is rolled by a finishing rolling facility equipped with a plurality of rolling mills, each of which has and is installed between adjacent rolling mills. A meandering amount measurement step for measuring the meandering amount of a hot-rolled steel strip running by a meandering amount measuring device, and a control located closest to the downstream side of a position where the meandering amount measuring device is installed by a leveling control calculation device. The heat 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 on the target rolling mill and the leveling control calculation device. Each control section is divided into a plurality of control sections from the first control section from when the tail end of the hot-rolled steel strip passes through a predetermined position on the transport line of the hot-rolled steel strip 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 calculated roll opening is calculated. Roll opening of the operation side and the driving side in the rolling mill of the controlled object, which includes a leveling control calculation step of transmitting the difference to the leveling device provided in the rolling mill of the controlled object, and is calculated by the leveling control calculation step. When the meandering amount of the hot-rolled steel strip measured by the meandering amount measuring device in each control section passes the control start point of the tail end portion of the degree difference. It is the meandering amount of the hot rolled steel strip measured by the meandering amount measuring device, and 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. The required difference load between the operation side and the drive side is the operation 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 gist is that the roll opening difference between the operation side and the drive side of the rolling mill to be controlled is the difference load between the operation side and the drive side obtained from the rolling load on the drive side.

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、演算されたロール開度差を前記制御対象の圧延機に設けられた前記レベリング装置に送出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、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 location 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 measuring device are installed. 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 near the downstream side of the position. The roll opening difference, which is the difference in opening of the roll gap between the operation side and the driving side in the rolling mill to be controlled, is calculated, and the calculated roll opening difference is calculated by the leveling device provided in the rolling mill to be controlled. 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 set in the first control section. The meandering amount of the hot-rolled steel strip measured by the meandering amount measuring device is the hotness measured by the meandering amount measuring device when the tail end portion passes through the control start point of the first control section. The meandering amount of the rolled steel strip, 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 said. 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 the first control section. The gist is that the roll opening difference between the operation side and the drive side of the rolling mill to be controlled is such that the load is different between the side and the drive side.

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制御区間を複数の制御区間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、演算されたロール開度差を前記制御対象の圧延機に設けられた前記レベリング装置に送出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、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。
また、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, 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, the meandering amount measuring device for measuring the meandering amount of the traveling hot-rolled steel strip and the tail end portion of the traveling hot-rolled steel strip pass through a predetermined position on the transport line of the hot-rolled steel strip. In each control section in which the first control section from to exiting the meandering amount measuring device is divided into a plurality of control sections, the meandering amount of the hot-rolled steel strip measured by the meandering amount measuring device and the meandering amount. Difference between operation side and drive side obtained from rolling load on operation side and drive side detected by the load detector installed in the rolling mill to be controlled near the downstream side of the position where the measuring device is installed. Based on the load, the roll opening difference, which is the difference in opening of the roll gap between the operation side and the drive side in the rolling mill to be controlled, is calculated, and the calculated roll opening difference is applied to the rolling mill to be controlled. Each of the above-mentioned target values of the roll opening difference between the operation side and the drive side in the rolling mill to be controlled, which is provided with a leveling control calculation device to be sent to the provided leveling device and is calculated by the leveling control calculation device. In the control section, the meandering amount of the hot-rolled steel strip measured by the meandering amount measuring device is measured by the meandering amount measuring device when the tail end portion passes through the control start point of each control section. The amount of meandering of the hot-rolled steel strip, and the difference 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 load is obtained from the rolling loads on the operation side and the driving side detected by the load detector provided on the rolling mill to be controlled when the tail end portion passes through the control start portion of each control section. The gist is that 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.
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することができる、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 above.

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。
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。
(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.
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蛇行量を算出する。
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。
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 and a two-dimensional camera. For example, the brightness distribution in the width direction of the steel strip 10 is measured, and the meandering amount is calculated from this brightness distribution.
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.

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。 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が制御開始箇所としての蛇行量測定装置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, in the leveling control calculation device 6, 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 as the control start point to the time when the rolling mill F7 to be controlled passes. In, the rolling of the controlled object is based only on the difference load of the operated side and the driven side obtained from the rolling load of the operating side and the driving side detected by the load detector 3 provided in the rolling mill F7 to be controlled. The roll opening difference between the operation side and the drive side in the machine F7 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、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. Is when the meandering amount of the steel strip 10 measured by the meandering amount measuring device 5 in the first control section A passes through the control start point (roller F6) of the first control section A at the tail end portion 10a. The meandering amount of the steel strip 10 measured by the meandering amount measuring device 5, and the operating side obtained from the rolling load on the operating side and the driving side detected by the load detector 3 provided in the rolling mill F7 to be controlled. And the differential load on the drive side is detected by the load detector 3 provided on the rolling mill F7 to be controlled when the tail end portion 10a passes through the control start point (rolling mill F6) of the first control section A. 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.

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。
一方、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(鋼帯10の中心CL2が圧延機F1〜F7の中心CL1上にくるようにする)となるようなロール開度差とすると、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。
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.
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 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 measured by the meandering amount measuring device 5 is 0 mm (so that the center CL2 of the steel strip 10 is on the center CL1 of the rolling mills F1 to F7). If the roll opening difference is such that the tail end portion 10a passes through the rolling mill F6 and the meandering of the steel strip 10 becomes large, the meandering amount is forced to be 0 mm, so that the meandering behavior of the steel strip 10 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、本実施形態のように、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、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の蛇行量となるようなロール開度差とすると、大きくなる鋼帯10の蛇行を無理なく制御開始時の蛇行量となるようにするので、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することができる。 On the other hand, as in the present embodiment, the operation side and the drive in 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. The target value of the roll opening difference on the side is the meandering amount of the steel strip 10 measured by the meandering amount measuring device 5 in the first control section A, and the tail end portion 10a is the control start point of the first control section A ( If the roll opening difference is such that the amount of meandering of the steel strip 10 measured by the meandering amount measuring device 5 when passing through the rolling mill F6), the meandering of the increasing steel strip 10 can be reasonably meandered at the start of control. Since the amount is adjusted, the meandering behavior of the steel strip 10 is not reversed, and the meandering behavior can be stably controlled.

また、本実施形態では、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、前述の蛇行量に加えて、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いる。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、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、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を0とするのと同様の現象が生じ、鋼帯10の蛇行挙動が逆転する現象が生じてしまう。このため、本実施形態のように、圧延機F7におけるロール開度差の目標値を、蛇行量が制御開始時の蛇行量となり、かつ、差荷重が制御開始時の差荷重となるようなロール開度差とすることで、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。 Further, in the present embodiment, the roll opening degree on 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. The target value of the difference is obtained from the rolling load on the operation side and the driving side detected by the load detector 3 provided on the rolling mill F7 to be controlled in addition to the above-mentioned meandering amount in the first control section A. The difference load between the operation side and the drive side is measured by the load detector 3 provided on the rolling mill F7 to be controlled when the tail end portion 10a passes through the control start point (rolling mill F6) of the first control section A. The roll opening difference is set so that the difference load between the operation side and the drive side is obtained from the detected rolling load on the operation side and the drive side. 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 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. Assuming that the roll opening difference is such that the difference load between the operation side and the drive side is 0 tonf, the meandering amount of the steel strip 10 in which the tail end portion 10a passes through the rolling mill F6 and becomes large is forcibly set to 0. A similar phenomenon occurs, and a phenomenon occurs in which the meandering behavior of the steel strip 10 is reversed. Therefore, as in the present embodiment, the target value of the roll opening difference in the rolling mill F7 is such that the meandering amount is the meandering amount at the start of control and the difference load is the difference load at the start of control. By setting the opening degree difference, the meandering behavior of the steel strip 10 can be controlled more stably without reversing the meandering behavior.

なお、圧延機F1〜F7の操作側及び駆動側の差荷重は、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)によっても発生する。このため、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、蛇行以外の差荷重要因の分、過剰な制御となり、蛇行挙動を逆転させる不安定な制御となってしまう。 The differential load between the operation side and the drive side of the rolling mills F1 to F7 is also generated by a factor other than meandering (for example, a temperature deviation in the plate width direction of the steel strip 10). Therefore, 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 set so that the difference load between the operation side and the drive side obtained from the load is 0 tonf, excessive control is performed due to the difference load factor other than meandering, resulting in unstable control that reverses the meandering behavior. It ends up.

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。 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. 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 10a passes through the control start point (rolling machine F6) in the first control section A. It is the difference in roll opening degree between the operating side and the driving side in the rolling mill F7 to be controlled so that the difference load between the operating side and the driving side is obtained.

これにより、第1制御区間A及び第2制御区間Bの双方において、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の制御目標値が、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。このため、差荷重の制御目標値を一回設定すれば良く、レベリング量の制御を簡単なものにすることができる。 As a result, in both the first control section A and the second control section B, 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 in the rolling mill F7 to be controlled and The load detector 3 provided on the rolling mill F7 to be controlled when the control target value of the differential load on the drive side passes through the control start point (rolling mill F6) of the first control section A at the tail end portion 10a. It 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. Therefore, it is only necessary to set the control target value of the differential load once, and the control of the leveling amount can be simplified.

なお、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てもよい。
これにより、蛇行挙動をより安定して制御することができることになる。
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 may be the difference load between the operation side and the drive side obtained from the above.
As a result, the meandering behavior can be controlled more stably.

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、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。
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 first control section A. When the meandering amount of the steel strip 10 measured by the meandering amount measuring device 5 in the first control section A passes through the control start point (roller F6) of the first control section A at the tail end portion 10a. The meandering amount of the steel strip 10 measured by the meandering amount measuring device 5, and the operating side obtained from the rolling load on the operating side and the driving side detected by the load detector 3 provided in the rolling mill F7 to be controlled. And the differential load on the drive side is detected by the load detector 3 provided on the rolling mill F7 to be controlled when the tail end portion 10a passes through the control start point (rolling mill F6) of the first control section A. 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.
As a result, as described above, the meandering behavior of the steel strip 10 can be stably controlled without reversing the meandering behavior.

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が制御開始箇所としての蛇行量測定装置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)。 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. In the leveling control calculation device 6, 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 as the control start point to the time when the rolling mill F7 to be controlled passes. In the rolling mill F7 to be controlled, based only on 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 3 provided on the rolling mill F7 to be controlled. The roll opening difference between the operation side and the drive side 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。
これにより、前述したように、差荷重の制御目標値を一回設定すれば良く、レベリング量の制御を簡単なものにすることができる。
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. 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 portion 10a passes through the control start point (rolling machine F6) in the first control section A. It is the roll opening difference between the operation side and the drive side in the rolling mill F7 to be controlled so as to obtain the obtained difference load between the operation side and the drive side.
As a result, as described above, the control target value of the differential load only needs to be set once, and the control of the leveling amount can be simplified.

なお、前述したように、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てもよい。
これにより、蛇行挙動をより安定して制御することができることになる。
As described above, the roll opening on the operation side and the drive side of 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. The target value of the difference is 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 3 provided in the rolling mill F7 to be controlled in the second control section B. However, when the tail end portion 10a passes through the control start point (serpentine amount measuring device 5) of the second control section B, the operation side and the operation side detected by the load detector 3 provided in 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 may be a difference load between the operation side and the drive side obtained from the rolling load on the drive side.
As a result, the meandering behavior can be controlled more stably.

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、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 measured by the meandering amount measuring device 5 when the tail end portion 10a passes through the control start point (roller F5) of the control section A1. 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 in the rolling mill F7 to be controlled. However, when the tail end portion 10a passes through the control start point (rolling machine F5) of the control section A1, rolling on the operation side and the driving side detected by the load detector 3 provided on the rolling mill F7 to be controlled. It is the difference in roll opening between the operating side and the driving side in the rolling mill F7 to be controlled so that the difference load between the operating side and the driving side is obtained from the load.

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、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。
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。
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 the section A2, the meandering amount of the steel strip 10 measured by the meandering amount measuring device 5 is measured by the meandering amount measuring device 5 when the tail end portion 10a passes through the control start point (roller F6) of the control section A2. The meandering amount of the steel strip 10 is obtained, 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 rolling load on the operation side and the driving side detected by the load detector 3 provided on the rolling mill F7 to be controlled when the tail end portion 10a passes through the control start point (rolling mill F6) in the control section A2. It is the difference in roll opening degree between the operating side and the driving side in the rolling mill F7 to be controlled so as to obtain the difference load between the operating side and the driving side obtained from.
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 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. It was obtained from the rolling load on the operation side and the driving side detected by the load detector 3 provided on the rolling mill F7 to be controlled when 10a passed through the control start point (rolling mill F6) in the control section A2. It is the difference in roll opening between the operating side and the driving side in the rolling mill F7 to be controlled so that the load is different between the operating side and the driving side.

なお、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てもよい。 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 may be the difference load between the operation side and the drive side obtained from the above.

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、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 measured by the meandering amount measuring device 5 when the tail end portion 10a passes through the control start point (roller F5) of the control section A1. 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 in the rolling mill F7 to be controlled. However, when the tail end portion 10a passes through the control start point (rolling machine F5) of the control section A1, rolling on the operation side and the driving side detected by the load detector 3 provided on the rolling mill F7 to be controlled. It is the difference in roll opening between the operating side and the driving side in the rolling mill F7 to be controlled so that the difference load between the operating side and the driving side is obtained from the load.

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、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 the section A2, the meandering amount of the steel strip 10 measured by the meandering amount measuring device 5 is measured by the meandering amount measuring device 5 when the tail end portion 10a passes through the control start point (roller F6) of the control section A2. The meandering amount of the steel strip 10 is obtained, 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 rolling load on the operation side and the driving side detected by the load detector 3 provided on the rolling mill F7 to be controlled when the tail end portion 10a passes through the control start point (rolling mill F6) in the control section A2. It is the difference in roll opening degree between the operating side and the driving side in the rolling mill F7 to be controlled so as to obtain the difference load between the operating side and the driving side obtained from.

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が制御開始箇所としての蛇行量測定装置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. In the leveling control calculation device 6, 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 as the control start point to the time when the rolling mill F7 to be controlled passes. In the rolling mill F7 to be controlled, based only on 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 3 provided on the rolling mill F7 to be controlled. The roll opening difference between the operation side and the drive side 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。 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. Obtained from the rolling load on the operation side and the driving side detected by the load detector 3 provided on the rolling mill F7 to be controlled when the portion 10a passes through the control start point (rolling machine F6) in the control section A2. It is the difference in roll opening between the operating side and the driving side in the rolling mill F7 to be controlled so that the load is different between the operating side and the driving side.

なお、前述したように、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てもよい。 As described above, the roll opening on the operation side and the drive side of 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. The target value of the difference is 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 3 provided in the rolling mill F7 to be controlled in the second control section B. However, when the tail end portion 10a passes through the control start point (serpentine amount measuring device 5) of the second control section B, the operation side and the operation side detected by the load detector 3 provided in 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 may be a difference load between the operation side and the drive side obtained from the rolling load on the drive side.

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、蛇行挙動をより安定して制御することができることになる。
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 can be controlled more stably.

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、蛇行計方式と差荷重方式のそれぞれの制御目標値を、第1形態のように、それぞれ制御開始時の蛇行量、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 values of the meandering meter method and the differential load method are set to meandering at the start of control as in the first mode. Amount and differential load.

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。
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.

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 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、尾端部10aが各制御区間の制御開始箇所を抜けたときの蛇行量測定装置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 the meandering amount of the steel strip 10 measured by the meandering amount measuring device 5 when the tail end portion 10a passes through the control start point of each control section, and is provided in the rolling mill F7 to be controlled. 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 3 is controlled when the tail end portion 10a passes through the control start point of each control section. The operating side of the rolling mill F7 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 3 provided on the rolling mill F7. It is preferable to set the difference in roll opening 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(鋼帯10の幅方向の中心が圧延機F1〜F7の中心に一致する)、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。 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 the section A, the meandering amount of the steel strip 10 measured by the meandering amount measuring device 5 is 0 mm (the center of the steel strip 10 in the width direction coincides with the centers of the rolling mills F1 to F7), and the rolling mill to be controlled. The roll opening on the operation side and the drive side of the controlled object such that 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 is 0 tonf. It was a difference.

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。 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、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蛇行量測定装置5によって測定された鋼帯10の蛇行量である31mm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 measured by the meandering amount measuring device 5 when the tail end portion 10a passes through the control start point of the first control section A. The meandering amount of the steel strip 10 is 31 mm, and the difference 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. The load is 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 tail end portion 10a passes through the control start portion of the first control section A. The roll opening difference between the operating side and the driving side of the rolling mill F7 to be controlled was set so as to be 27 tonf, which is the obtained difference load between the operating side and the driving side.

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。 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 first control section A 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 27 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.

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31mmであるのに対して32mmであり、蛇行挙動は安定している。
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 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 32 mm, while the target value is 31 mm. Yes, the meandering behavior is stable.
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 (13)

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、演算されたロール開度差を前記制御対象の圧延機に設けられた前記レベリング装置に送出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、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 calculated. Including a leveling control calculation step of transmitting the difference in roll opening degree to the leveling device provided in the rolling mill to be controlled.
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 becomes the meandering amount of the hot rolled steel strip measured by the meandering amount measuring device when the tail end portion passes through the control start portion of the first control section, and the said 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 controlled by the tail end portion of the first 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 in the rolling mill to be controlled when passing through the start point is obtained. A method for controlling meandering of a hot-rolled steel strip, which comprises a difference in roll opening degree between an operation side and a drive side of a rolling mill to be controlled.
前記レベリング制御演算ステップでは、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し、演算されたロール開度差を前記制御対象の圧延機に設けられた前記レベリング装置に送出す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。 In the leveling control calculation step, in the second control section from when the tail end portion of the traveling hot-rolled steel strip passes through the meandering amount measuring device as a control start point to when it passes through the rolling mill to be controlled. 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 hot according to claim 1, wherein the roll opening difference between the side and the driving side is calculated, and the calculated roll opening difference is sent to the leveling device provided in the rolling mill to be controlled. Serpentine control method for rolled steel strips. 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することを特徴とする請求項2に記載の熱間圧延鋼帯の蛇行制御方法。 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 set to the load provided on 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 detector passes through the control start portion of the first control section. The operating side and driving 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 in the rolling mill. The method for controlling meandering of a hot-rolled steel strip according to claim 2, wherein the roll opening difference on the side is used. 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請求項2に記載の熱間圧延鋼帯の蛇行制御方法。 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 set to the load provided on 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 detector passes through the control start portion of the second control section. The operating side and driving 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 in the rolling mill. The method for controlling meandering of a hot-rolled steel strip according to claim 2, wherein the roll opening difference on the side is used. 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乃至4のうちいずれか一項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 method for controlling meandering of a hot-rolled steel strip according to any one of claims 1 to 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制御区間を複数の制御区間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、演算されたロール開度差を前記制御対象の圧延機に設けられた前記レベリング装置に送出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、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,
The first control section from the tail end of the traveling hot-rolled steel strip passing through a predetermined position on the transport line of the hot-rolled steel strip to passing through the meandering amount measuring device by the leveling control calculation device. In each control section divided into a plurality of control sections, 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 were detected. Roll opening difference, which is the difference in opening 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. Is included, and the calculated roll opening difference is sent to the leveling device provided in the rolling mill to be controlled, including a leveling control calculation step.
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 becomes the meandering amount of the hot-rolled steel strip measured by the meandering amount measuring device when the tail end portion passes through the control start portion of each control section, and the controlled object. 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 is such that the tail end portion determines the control start point of each control section. The control target is such that 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 when the rolling load is removed. A method for controlling meandering of a hot-rolled steel strip, characterized in that the roll opening difference between the operation side and the drive side of the rolling mill is used.
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、演算されたロール開度差を前記制御対象の圧延機に設けられた前記レベリング装置に送出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、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. 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 near the downstream side of the position where the meandering amount measuring device is installed. 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 above, it is the difference in opening degree of the roll gap between the operation side and the drive side in the rolling mill to be controlled. It is provided with a leveling control calculation device that calculates the roll opening difference and sends the calculated roll opening difference to the leveling device provided in the rolling mill to be controlled.
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 becomes the meandering amount of the hot rolled steel strip measured by the meandering amount measuring device when the tail end portion passes through the control start portion of the first control section, and the said 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 controlled by the tail end portion of the first 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 in the rolling mill to be controlled when passing through the start point is obtained. A meandering control device for a hot-rolled steel strip, characterized in that the roll opening difference between the operation side and the drive side of the rolling mill to be controlled is set.
前記レベリング制御演算装置は、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前記制御対象の圧延機に設けられた前記レベリング装置に送出するように構成されていることを特徴とする請求項7に記載の熱間圧延鋼帯の蛇行制御装置。 The leveling control calculation device is used in a second control section from when the tail end of the traveling hot-rolled steel strip passes through the meandering amount measuring device as a control start point to when it passes through the rolling mill to be controlled. 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. It is configured to calculate the roll opening difference, which is the opening difference between the roll gaps on the side and the driving side, and send the calculated roll opening difference to the leveling device provided in the rolling mill to be controlled. The meandering control device for a hot-rolled steel strip according to claim 7, wherein the hot-rolled steel strip is provided. 前記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請求項8に記載の熱間圧延鋼帯の蛇行制御装置。 The target value of the roll opening difference between the operation side and the drive side of the rolling mill to be controlled, which is calculated by the leveling control calculation device, is set to the load provided on 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 detector passes through the control start portion of the first 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 in the rolling mill of The meandering control device for a hot-rolled steel strip according to claim 8, wherein the roll opening degree difference is obtained. 前記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請求項8に記載の熱間圧延鋼帯の蛇行制御装置。 The target value of the roll opening difference between the operation side and the drive side of the rolling mill to be controlled, which is calculated by the leveling control calculation device, is set to the load provided on 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 detector 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 in the rolling mill of The meandering control device for a hot-rolled steel strip according to claim 8, wherein the roll opening degree difference is obtained. 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7乃至10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。 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 any one of claims 7 to 10. 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制御区間を複数の制御区間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、演算されたロール開度差を前記制御対象の圧延機に設けられた前記レベリング装置に送出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、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,
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 to when it passes through the meandering amount measuring device is divided into a plurality of control sections. In each control section, the meandering amount of the hot-rolled steel strip measured by the meandering amount measuring device and the rolling mill to be controlled near the downstream side of the position where the meandering amount measuring device is installed are provided. 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 gap on the operation side and the drive side in the rolling mill to be controlled. A leveling control calculation device that calculates the roll opening difference, which is the difference in opening, and sends the calculated roll opening difference to the leveling device provided in the rolling mill to be controlled.
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 becomes the meandering amount of the hot-rolled steel strip measured by the meandering amount measuring device when the tail end portion passes through the control start portion of each control section, and the controlled object. 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 is such that the tail end portion determines the control start point of each control section. The control target is such that 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 when the rolling load is removed. A meandering control device for a hot-rolled steel strip, characterized in that the roll opening difference between the operation side and the drive side of the rolling mill is set.
請求項7乃至12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 7 to 12.
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