JP2988330B2 - Control method of winding temperature of hot rolled steel sheet - Google Patents
Control method of winding temperature of hot rolled steel sheetInfo
- Publication number
- JP2988330B2 JP2988330B2 JP7183633A JP18363395A JP2988330B2 JP 2988330 B2 JP2988330 B2 JP 2988330B2 JP 7183633 A JP7183633 A JP 7183633A JP 18363395 A JP18363395 A JP 18363395A JP 2988330 B2 JP2988330 B2 JP 2988330B2
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- winding temperature
- cooling water
- cooling
- roller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【産業上の利用分野】本発明は、熱間圧延された鋼板を
ランアウトテーブル上で冷却して巻き取り温度を制御す
る熱延鋼板の巻き取り温度制御方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a winding temperature of a hot-rolled steel sheet, which controls a winding temperature by cooling a hot-rolled steel sheet on a run-out table.
【０００２】[0002]
【従来の技術】熱間圧延では、仕上圧延機から出た高温
の熱延鋼板がコイラーに巻き取られて製品コイルとな
る。このとき、コイラーに巻き取られる熱延鋼板の温
度、すなわち巻き取り温度が鋼板の機械的特性に大きな
影響を及ぼす。そのため、仕上圧延機とコイラーとの間
に設けられたランアウトテーブル上で、鋼板が制御冷却
されてその巻き取り温度が制御される。2. Description of the Related Art In hot rolling, a high-temperature hot-rolled steel sheet from a finishing mill is wound around a coiler to form a product coil. At this time, the temperature of the hot-rolled steel sheet wound by the coiler, that is, the winding temperature has a great influence on the mechanical properties of the steel sheet. Therefore, the steel sheet is controlled and cooled on the run-out table provided between the finishing mill and the coiler, and the winding temperature is controlled.
【０００３】図１は熱延鋼板の巻き取り温度制御を説明
するための装置構成図である。仕上圧延機２を出てラン
アウトテーブル上を進む鋼板１は、ランアウトテーブル
の上面側および下面側に設けられそれぞれが鋼板進行方
向において複数のバンクに分割された冷却ヘッダー３，
４からの注水により冷却されてコイラー５に巻き取られ
る。FIG. 1 is an apparatus configuration diagram for explaining the control of the winding temperature of a hot-rolled steel sheet. The steel sheet 1 that exits the finishing mill 2 and travels on the run-out table is provided on the upper surface side and the lower surface side of the run-out table.
It is cooled by the water injection from 4 and wound up by the coiler 5.
【０００４】このとき、冷却前の鋼板温度（圧延終了温
度）が仕上圧延機２の出側に設けた仕上出側温度計６ａ
により測定されると共に、冷却後の鋼板温度（巻き取り
温度）がコイラー５の入側に設けた巻き取り温度計６ｂ
により測定される。そして、所望の機械的特性を得るた
め、コントローラ８において鋼板１の巻き取り温度が予
測計算され、その計算値が目標値に一致するように冷却
ヘッダー３，４からの注水量がフィードフォワード制御
される。また、巻き取り温度の測定値と目標値の偏差に
基づいて、上記注水量がフィードバック制御により微調
整される。At this time, the temperature of the steel sheet before the cooling (rolling end temperature) is measured by a finishing output thermometer 6 a provided on the output side of the finishing mill 2.
The temperature of the steel sheet after cooling (winding temperature) is measured by a winding thermometer 6b provided on the inlet side of the coiler 5.
Is measured by Then, in order to obtain desired mechanical characteristics, the controller 8 predicts and calculates the winding temperature of the steel sheet 1, and feeds forward control of the amount of water injected from the cooling headers 3 and 4 so that the calculated value matches the target value. You. Further, based on the deviation between the measured value of the winding temperature and the target value, the water injection amount is finely adjusted by feedback control.
【０００５】更に、ランアウトテーブルでは鋼板の巻き
取り温度制御とは別に、ランアウトテーブルを構成する
多数のテーブルローラ９が、給水経路１０を経て各ロー
ラへ噴出される冷却水により強制冷却される。このロー
ラの冷却は、鋼板１の通過に伴いテーブルローラ９が高
温となって割れを生じるのを防止するためであり、圧延
開始前から圧延終了後まで継続されるのが通例である。Further, in the run-out table, apart from controlling the winding temperature of the steel sheet, a large number of table rollers 9 constituting the run-out table are forcibly cooled by cooling water jetted to each roller via a water supply path 10. This cooling of the rollers is to prevent the table rollers 9 from becoming hot and cracking as the steel sheet 1 passes, and is usually continued from before the start of rolling to after the end of rolling.
【０００６】このような熱延鋼板の巻き取り温度制御で
は、巻き取り温度を出来るだけ高精度に制御することが
鋼板の品質精度を高めるために必要である。そのため
に、特開平２−７５４１０号公報では巻き取り温度を制
御入力とするフィードバック制御系において、巻き取り
温度の測定値から高周波成分を除いてその信号をコント
ローラに与えることにより、外乱によって生じる巻き取
り温度誤算を減少させることが提案されている。また、
特開昭５８−４７９２４号公報では温度降下の予測誤差
を減少させるために、計算と実績の水冷能力の比から各
制御単位の冷却能力を学習することが提案されている。In the control of the winding temperature of such a hot-rolled steel sheet, it is necessary to control the winding temperature as accurately as possible in order to improve the quality accuracy of the steel sheet. For this purpose, Japanese Unexamined Patent Publication No. Hei 2-75410 discloses a feedback control system in which the winding temperature is used as a control input. It has been proposed to reduce temperature miscalculations. Also,
Japanese Patent Laying-Open No. 58-47924 proposes learning the cooling capacity of each control unit from the ratio of the calculated and actual water cooling capacity in order to reduce the prediction error of the temperature drop.
【０００７】[0007]
【発明が解決しようとする課題】ところで、熱延鋼板の
巻き取り温度制御を行なうランアウトテーブルでは、前
述したように、その巻き取り温度制御とは別に、テーブ
ルローラの割れを防ぐために、各テーブルローラが冷却
水により強制的に冷却される。しかし、ローラ冷却水が
噴出されると、鋼板とテーブルロールとの間に滑りが発
生し、鋼板が進みにくくなる。そして従来のローラ冷却
では、図２に示すように、鋼板１の先端が到達する前か
らローラ冷却水１１が噴出されるために、特に板厚が２
ｍｍ以下の薄鋼板の場合は、その先端部の通板速度が低
下して、その形状が崩れ、通板性が著しく低下するとい
う問題がある。By the way, in the run-out table for controlling the winding temperature of the hot-rolled steel sheet, as described above, separately from the winding temperature control, in order to prevent the table roller from breaking, each table roller is controlled. Is forcibly cooled by the cooling water. However, when the roller cooling water is jetted, slippage occurs between the steel sheet and the table roll, and the steel sheet hardly advances. In the conventional roller cooling, as shown in FIG. 2, since the roller cooling water 11 is jetted out before the tip of the steel sheet 1 reaches, especially the sheet thickness is 2 mm.
In the case of a thin steel plate having a thickness of not more than mm, there is a problem that the passing speed of the leading end portion is reduced, the shape is collapsed, and the passing property is significantly reduced.
【０００８】この問題を解決するために、本発明者らは
ローラ冷却水を供給する給水経路を鋼板進行方向におい
て複数のゾーンに分割し、鋼板の先端部が通過したゾー
ンから順にローラ冷却水の噴出を開始することを考え
た。In order to solve this problem, the present inventors divided the water supply path for supplying the roller cooling water into a plurality of zones in the traveling direction of the steel sheet, and sequentially started the roller cooling water from the zone where the leading end of the steel sheet passed. Thought to start gushing.
【０００９】しかしながら、このような噴出タイミング
制御を行なうと、鋼板の冷却途中にローラ冷却水の噴出
が開始される。そうすると、鋼板からテーブルローラへ
の抜熱量が増大し、鋼板温度が途中から４０℃程度低下
する。このような大きく急激な温度低下に対し、フィー
ドバック制御により巻き取り温度誤差を減少させる従来
の巻き取り温度制御は、応答遅れのため全く対応できな
い。また、冷却能力を学習する方法も巻き取り温度の実
績平均値を目標値に近づけることはできても、冷却途中
の温度低下を防止することはできず、むしろローラ冷却
水の噴出状況によって学習値が外乱を受ける。従って、
この方法も又、ローラ冷却水の噴出タイミング制御によ
る鋼板温度低下に対しては無力である。However, when such ejection timing control is performed, ejection of roller cooling water is started during cooling of the steel sheet. Then, the amount of heat removed from the steel sheet to the table roller increases, and the temperature of the steel sheet drops by about 40 ° C. halfway. The conventional winding temperature control that reduces the winding temperature error by feedback control for such a large and sudden temperature drop cannot respond at all due to a response delay. In addition, the method of learning the cooling capacity can make the actual average value of the winding temperature close to the target value, but cannot prevent the temperature drop during cooling. Suffers disturbance. Therefore,
This method is also ineffective for reducing the temperature of the steel sheet by controlling the timing of jetting the roller cooling water.
【００１０】すなわち、ローラ冷却水の噴出タイミング
を制御することより、鋼板の通板性を改善することはで
きても、代わりに鋼板の巻き取り温度精度が長手方向に
おいて著しく低下するという問題が新たに生じる。[0010] That is, by controlling the timing of jetting the roller cooling water, it is possible to improve the sheet passing property of the steel sheet, but instead, there is a new problem that the winding temperature accuracy of the steel sheet is significantly reduced in the longitudinal direction. Occurs.
【００１１】本発明の目的は、ローラ冷却水の噴出に伴
う通板性の低下を防ぎ、合わせて鋼板の全長にわたって
巻き取り温度を精度よく制御することができる熱延鋼板
の巻き取り温度制御方法を提供することにある。An object of the present invention is to provide a method for controlling a winding temperature of a hot-rolled steel sheet, which can prevent a decrease in sheet passing property due to a jet of roller cooling water, and can accurately control a winding temperature over the entire length of the steel sheet. Is to provide.
【００１２】[0012]
【課題を解決するための手段】本発明の熱延鋼板の巻き
取り温度制御方法は、熱間圧延された鋼板をランアウト
テーブル上で冷却して巻き取り温度を制御する方法にお
いて、ランアウトテーブルを構成する多数のテーブルロ
ーラを冷却する冷却水の給水経路を、鋼板進行方向にお
いて独立制御が可能な複数のゾーンに分割して、鋼板の
先端部が通過したゾーンから順にローラ冷却水の噴出を
開始し、且つ、予測計算した鋼板の巻き取り温度が目標
値に一致するように冷却ヘッダーからの注水量をフィー
ドフォワード制御する際に、ローラ冷却水の噴出による
鋼板温度の変化量を計算し、その変化を打ち消すべく前
記注水量を補正するものである。SUMMARY OF THE INVENTION A method for controlling a winding temperature of a hot-rolled steel sheet according to the present invention is a method for controlling a winding temperature by cooling a hot-rolled steel sheet on a run-out table. The cooling water supply path that cools a large number of table rollers is divided into a plurality of zones that can be independently controlled in the steel sheet advancing direction, and the roller cooling water starts to be jetted in order from the zone where the tip of the steel sheet has passed. When feedforward control is performed on the amount of water injected from the cooling header so that the predicted calculated winding temperature of the steel sheet matches the target value, the amount of change in the steel sheet temperature due to the ejection of roller cooling water is calculated, and the change is calculated. Is corrected to cancel the water injection amount.
【００１３】[0013]
【作用】本発明の熱延鋼板の巻き取り温度制御方法にお
いては、ローラ冷却水の給水経路を鋼板進行方向に複数
分割し、鋼板の先端部が通過してからローラ冷却水を噴
出するので、薄鋼板の場合も先端部の進行速度低下に伴
う形状崩れが防止され、通板状態を良好に保ちながらテ
ーブルローラを冷却することができる。また、鋼板の冷
却開始後にローラ冷却水を噴出し始めるにもかかわら
ず、その噴出による温度変化を予め見込んだフィードフ
ォワード制御が行なわれるので、ローラ冷却水の噴出に
よる巻き取り温度の変化が防止される。In the method for controlling the winding temperature of a hot-rolled steel sheet according to the present invention, the supply path of the roller cooling water is divided into a plurality of parts in the traveling direction of the steel sheet, and the roller cooling water is ejected after the leading end of the steel sheet passes. In the case of a thin steel plate as well, the shape collapse due to a decrease in the traveling speed of the leading end is prevented, and the table roller can be cooled while maintaining a good passing state. Further, despite the fact that the roller cooling water starts to be ejected after the start of cooling of the steel sheet, the feedforward control is performed in consideration of the temperature change due to the ejection, so that the change in the winding temperature due to the ejection of the roller cooling water is prevented. You.
【００１４】[0014]
【実施例】以下に本発明の実施例を図面に基づいて説明
する。図３に本発明を実施するのに適した装置構成を示
す。Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 shows an apparatus configuration suitable for carrying out the present invention.
【００１５】仕上圧延機２の出側に設けられたランアウ
トテーブルは、上流部と下流部に２分割され、下流部と
下流部の間には近接コイラー５ａが、下流部の下流側に
は遠方コイラー５ｂがそれぞれ設けられている。また、
仕上圧延機２の出側には仕上出口温度計６ａが、近接コ
イラー５ａおよび遠方コイラー５ａの入側には、中間温
度計６ｃおよび巻き取り温度計６ｂがそれぞれ設けられ
ている。The run-out table provided on the output side of the finishing mill 2 is divided into an upstream portion and a downstream portion, and a proximity coiler 5a is provided between the downstream portion and the downstream portion, and a distant downstream portion is provided on the downstream side of the downstream portion. Each of the coilers 5b is provided. Also,
A finishing outlet thermometer 6a is provided on the outlet side of the finishing mill 2, and an intermediate thermometer 6c and a winding thermometer 6b are provided on the inlet sides of the near coiler 5a and the far coiler 5a, respectively.
【００１６】ランアウトテーブルの上面側に設けられた
冷却ヘッダー３および下面側に設けられた冷却ヘッダー
４は、鋼板１の進行方向において１４個のバンクに分割
されている。また、ランアウトテーブルを構成するテー
ブルローラ９は冷却水により強制冷却され、その冷却水
を供給する給水経路１０は鋼板１の進行方向において３
つのゾーンに分割されている。第１ゾーンは近接コイラ
ー５ａの上流側に位置し、第２ゾーンおよび第３ゾーン
は近接コイラー５ａと遠方コイラー５ｂの間に位置す
る。各ゾーンにおいてはバルブ１２ａ，１２ｂ，１２ｃ
により独立にローラ冷却水の噴出がオンオフされる。The cooling header 3 provided on the upper surface side of the run-out table and the cooling header 4 provided on the lower surface side are divided into 14 banks in the traveling direction of the steel sheet 1. Further, the table roller 9 constituting the run-out table is forcibly cooled by the cooling water, and the water supply path 10 for supplying the cooling water has a width of 3 in the traveling direction of the steel plate 1.
Divided into two zones. The first zone is located upstream of the proximity coiler 5a, and the second and third zones are located between the proximity coiler 5a and the remote coiler 5b. In each zone, valves 12a, 12b, 12c
As a result, the ejection of the roller cooling water is turned on and off independently.
【００１７】冷却ヘッダー３，４からの注水量を制御す
るコントローラ８は、仕上出口温度計６ａから圧延仕上
温度の実績値を取り込み、仕上圧延機２から鋼板速度の
実績値を取り込む。これらを含む種々の実績値を用い
て、コントローラ８は次の処理を行なう。鋼板１の現在
温度を計算する。鋼板現在温度と鋼板速度とランアウト
テーブルでの鋼板温度降下量（予測計算値）とから巻き
取り温度を予測する。その予測値が目標値となるように
冷却ヘッダー３，４のバルブ開閉パターンを修正する。A controller 8 for controlling the amount of water injected from the cooling headers 3 and 4 takes in the actual value of the finishing temperature from the finishing outlet thermometer 6a and the actual value of the steel sheet speed from the finishing mill 2. Using various performance values including these, the controller 8 performs the following processing. The current temperature of the steel sheet 1 is calculated. The winding temperature is predicted from the current steel sheet temperature, the steel sheet speed, and the steel sheet temperature drop amount (predicted calculation value) in the run-out table. The valve opening / closing pattern of the cooling headers 3 and 4 is corrected so that the predicted value becomes the target value.
【００１８】このような装置構成を用いて、本実施例の
巻き取り温度制御は次のように実行される。図４にロー
ル冷却水の噴出タイミングを示し、図５に鋼板長手方向
の巻き取り温度分布を示す。Using such an apparatus configuration, the winding temperature control of this embodiment is executed as follows. FIG. 4 shows the timing of jetting the roll cooling water, and FIG. 5 shows the winding temperature distribution in the longitudinal direction of the steel sheet.
【００１９】給水経路１０のバルブ１２ａ，１２ｂ，１
２ｃを全て閉じた状態で、冷却ヘッダー３，４から注水
を行ないながら、仕上圧延機２から鋼板１が進出する。
鋼板１の先端が中間温度計６ｃを通過した後、ｔ１秒後
にバルブ１２ａが開かれ、第１ゾーンにおいてロール冷
却水の噴出が始まる。鋼板１の先端が遠方コイラー５ｂ
に噛み込まれた後、ｔ２秒後、ｔ３（＞ｔ２）秒後にバ
ルブ１２ｂ，１２ｃがそれぞれ開放されることにより、
第２ゾーン、第３ゾーンにおいて順番にロール冷却水の
噴出が開始される。The valves 12a, 12b, 1 of the water supply path 10
The steel sheet 1 advances from the finishing mill 2 while water is injected from the cooling headers 3 and 4 in a state where 2c is completely closed.
After the tip of the steel sheet 1 has passed the intermediate thermometer 6c, the valve 12a is opened after t1 seconds, and the jetting of the roll cooling water starts in the first zone. The tip of steel plate 1 is far coiler 5b
After t2 seconds and t3 (> t2) seconds after opening, the valves 12b and 12c are opened, respectively.
In the second zone and the third zone, the jetting of the roll cooling water is started in order.
【００２０】このように、鋼板１の先端部が通過した後
にロール冷却水の噴出を開始することにより、先端部が
テーブルローラ９によりスムーズに搬送され、先端部の
形状崩れによる通板性低下が防止される。このとき、鋼
板１の先端部は第１〜３ゾーンのいずれにおいてもロー
ル冷却水の噴出による温度低下を生じない。ロール冷却
水の噴出が始まった後に通過する部分から、その噴出に
よる温度低下を生じる。そのため、冷却ヘッダー３，４
から従来通りの注水が行なわれる場合は、図５に破線で
示すように、鋼板の巻き取り温度が先端部を除き目標値
より低くなる。そこで本制御では、この鋼板の温度降下
を防止するため、冷却ヘッダー３，４からの注水量を補
正する。この補正の詳細は次の通りである。As described above, by starting the jet of the roll cooling water after the front end of the steel sheet 1 has passed, the front end is smoothly conveyed by the table roller 9, and the deterioration of the sheet passing property due to the collapse of the shape of the front end. Is prevented. At this time, the temperature of the leading end of the steel sheet 1 does not decrease due to the jet of the roll cooling water in any of the first to third zones. The temperature drop due to the jetting of the roll cooling water from the part that passes after the jetting of the cooling water starts. Therefore, cooling headers 3 and 4
Therefore, when water injection is performed in the conventional manner, the winding temperature of the steel sheet becomes lower than the target value except for the tip end, as shown by the broken line in FIG. Therefore, in this control, the amount of water injected from the cooling headers 3 and 4 is corrected in order to prevent the temperature drop of the steel sheet. The details of this correction are as follows.
【００２１】鋼板の巻き取り温度を予測計算するための
熱伝達方程式は数式１により与えられ、鋼板表面の境界
条件は数式２により与えられる。The heat transfer equation for predicting and calculating the winding temperature of the steel sheet is given by Equation 1, and the boundary condition of the steel sheet surface is given by Equation 2.
【００２２】[0022]
【数１】 (Equation 1)
【００２３】[0023]
【数２】 (Equation 2)
【００２４】上面、下面の熱流速はｑt 、ｑb は次式に
より与えられる。 ｑt ＝ｑwt＋ｑRt＋ｑAt ｑb ＝ｑwb＋ｑRb＋ｑr ｑwt、ｑwb：上面、下面の水冷の熱流速 ｑRt、ｑRb：上面、下面の輻射の熱流速 ｑAt、ｑAb：上面、下面の対流の熱流速 ｑr ：下面のテーブルローラへの熱流速The upper surface, a lower surface of the heat flow rate q t, the q b is given by the following equation. q t = q wt + q Rt + q At q b = q wb + q Rb + q r q wt, q wb: top, bottom surface of the water cooling of the heat flux q Rt, q Rb: top, heat flux of the lower surface of the radiation q At, q Ab : Heat flow velocity of convection between upper and lower surfaces qr : Heat flow speed to table rollers on lower surface
【００２５】そして本制御では下面のテーブルローラへ
の熱流速ｑr を次のように求める。 ｑr ＝Ｆｈr （θS −θW ） ｈr ：テーブルローラ冷却水の熱伝達率〔Ｗ／ｍ2 ℃〕 θS ：鋼板表面温度〔℃〕 θW ：テーブルローラ冷却
水温度〔℃〕 Ｆ ：１ テーブルローラ冷却水噴出時 ０ テーブルローラ冷却水停止時In this control, the heat flow rate qr to the lower table roller is obtained as follows. q r = Fh r (θ S -θ W) h r: heat transfer coefficient table roller cooling water [W / m 2 ° C.] theta S: steel sheet surface temperature [° C.] theta W: table roller cooling water temperature [° C.] F: When table roller cooling water is jetted 0 When table roller cooling water is stopped
【００２６】すなわち本制御では、境界条件における下
面の熱流速ｑb を求めるにあたり、ローラ冷却水の停止
時にテーブルローラへの熱流速ｑr を考慮せず、ローラ
冷却水の噴出時にのみテーブルローラへの熱流速ｑr を
考慮する。[0026] That is, in this control, when determining the heat flux q b of the lower surface in boundary conditions, without considering the heat flux q r to the table rollers when the roller cooling water stopped, the only table rollers when ejection rollers coolant consider the heat flux q r.
【００２７】このように、本制御ではローラ冷却水の状
態により下面の熱流速を変化させて、上記熱伝導方程式
を解くことにより、鋼板の巻き取り温度を予測計算す
る。そして、巻き取り温度の予測計算値と目標値とか
ら、必要な上面、下面の冷却水量を計算し、冷却ヘッダ
ー３，４からの注水量をフィードフォワード制御する。
これにより、ローラ冷却水の噴出と同時に、その噴出に
よる鋼板の温度低下を打ち消すように、冷却ヘッダー
３，４からの注水量が補正される。その結果、図５に実
線で示すように、鋼板の巻き取り温度が全長にわたって
目標値に精度よく制御される。As described above, in the present control, the winding temperature of the steel sheet is predicted and calculated by changing the heat flow rate on the lower surface according to the state of the roller cooling water and solving the above heat conduction equation. Then, the required amount of cooling water on the upper and lower surfaces is calculated from the predicted calculated value of the winding temperature and the target value, and the amount of water injected from the cooling headers 3 and 4 is feedforward controlled.
Thus, simultaneously with the ejection of the roller cooling water, the amount of water injected from the cooling headers 3 and 4 is corrected so as to cancel the temperature drop of the steel sheet due to the ejection. As a result, as shown by the solid line in FIG. 5, the winding temperature of the steel sheet is accurately controlled to the target value over the entire length.
【００２８】[0028]
【発明の効果】以上に説明した通り、本発明の熱延鋼板
の巻き取り温度制御方法は、鋼板の先端部が通過してか
らロール冷却水の噴出を開始するので、先端部の形状崩
れが防止され、通板性を良好に保ちながらテーブルロー
ラを冷却できる。また、冷却ヘッダーからの注水量をフ
ィードフォワード制御する際にその注水量をロール冷却
水の噴出状態に応じて補正するので、その噴出による巻
き取り温度制御への外乱が除去され、鋼板全長にわたっ
て高精度な巻き取り温度制御を実現できる。As described above, in the method for controlling the winding temperature of a hot-rolled steel sheet according to the present invention, since the roll cooling water starts to be jetted after the front end of the steel sheet passes, the shape of the front end collapses. Thus, the table roller can be cooled while maintaining good sheet passing properties. In addition, when the water injection amount from the cooling header is subjected to feedforward control, the water injection amount is corrected in accordance with the jetting state of the roll cooling water, so that disturbance to the winding temperature control due to the jetting is eliminated, and the height is increased over the entire length of the steel sheet. Accurate winding temperature control can be realized.
【図面の簡単な説明】[Brief description of the drawings]
【図１】熱延鋼板の巻き取り温度制御を説明するための
模式図である。FIG. 1 is a schematic diagram for explaining control of a winding temperature of a hot-rolled steel sheet.
【図２】ローラ冷却水の噴出による通板性の低下を説明
するための模式図である。FIG. 2 is a schematic diagram for explaining a decrease in sheet passing property due to ejection of roller cooling water.
【図３】本発明の巻き取り温度制御方法を実施するのに
適した装置構成の模式図である。FIG. 3 is a schematic diagram of an apparatus configuration suitable for implementing a winding temperature control method of the present invention.
【図４】ロール冷却水の噴出タイミングを示すタイムチ
ャートである。FIG. 4 is a time chart showing the timing of jetting roll cooling water.
【図５】ロール冷却水の噴出に応じてヘッダー水量を補
正した場合の効果を示す巻き取り温度分布図である。FIG. 5 is a winding temperature distribution diagram showing an effect when the header water amount is corrected in accordance with the ejection of roll cooling water.
１ 鋼板 ２ 仕上圧延機 ３，４ 冷却ヘッダー ５ コイラー ６ 温度計 ８ コントローラ ９ テーブルローラ １０ 給水経路 １２ バルブ DESCRIPTION OF SYMBOLS 1 Steel plate 2 Finishing rolling mill 3, 4 Cooling header 5 Coiler 6 Thermometer 8 Controller 9 Table roller 10 Water supply path 12 Valve
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) B21B 37/76 B21B 39/12 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) B21B 37/76 B21B 39/12
Claims (1)
ル上で冷却して巻き取り温度を制御する方法において、 ランアウトテーブルを構成する多数のテーブルローラを
冷却する冷却水の給水経路を、鋼板進行方向において独
立制御が可能な複数のゾーンに分割して、鋼板の先端部
が通過したゾーンから順にローラ冷却水の噴出を開始
し、 且つ、予測計算した鋼板の巻き取り温度が目標値に一致
するように冷却ヘッダーからの注水量をフィードフォワ
ード制御する際に、ローラ冷却水の噴出による鋼板温度
の変化量を計算し、その変化を打ち消すべく前記注水量
を補正することを特徴とする熱延鋼板の巻き取り温度制
御方法。In a method for controlling a winding temperature by cooling a hot-rolled steel sheet on a run-out table, a supply path of cooling water for cooling a large number of table rollers constituting the run-out table is provided in a traveling direction of the steel sheet. In the above, the roller is divided into a plurality of zones that can be independently controlled, and the roller cooling water is started to be jetted sequentially from the zone where the leading end of the steel sheet has passed, and that the predicted calculated winding temperature of the steel sheet matches the target value. When feed-forward controlling the amount of water injected from the cooling header, calculate the amount of change in the temperature of the steel sheet due to the ejection of the roller cooling water, and correct the amount of water injection to cancel the change. Winding temperature control method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7183633A JP2988330B2 (en) | 1995-06-26 | 1995-06-26 | Control method of winding temperature of hot rolled steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7183633A JP2988330B2 (en) | 1995-06-26 | 1995-06-26 | Control method of winding temperature of hot rolled steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0910812A JPH0910812A (en) | 1997-01-14 |
| JP2988330B2 true JP2988330B2 (en) | 1999-12-13 |
Family
ID=16139197
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7183633A Expired - Lifetime JP2988330B2 (en) | 1995-06-26 | 1995-06-26 | Control method of winding temperature of hot rolled steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2988330B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102430594A (en) * | 2011-09-21 | 2012-05-02 | 河北省首钢迁安钢铁有限责任公司 | Method for eliminating loop rise of thin gauge strip on layer-cold roller way |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5176596B2 (en) * | 2007-02-28 | 2013-04-03 | Ｊｆｅスチール株式会社 | Method for determining quality of hot-rolled metal strip using near-infrared camera in hot rolling, manufacturing method of hot-rolled metal strip |
| JP5499615B2 (en) * | 2009-10-15 | 2014-05-21 | 新日鐵住金株式会社 | Steel plate cooling method |
| JP5950661B2 (en) * | 2012-04-09 | 2016-07-13 | 新日鐵住金株式会社 | Method and method for cooling hot-rolled steel sheet |
| JP6189721B2 (en) * | 2013-11-13 | 2017-08-30 | 株式会社日立製作所 | Hot rolling control device and hot rolling control method |
| CN111215456B (en) * | 2018-11-23 | 2021-10-22 | 宝山钢铁股份有限公司 | Method for controlling threading stability of strip steel in hot-rolling laminar cooling area |
-
1995
- 1995-06-26 JP JP7183633A patent/JP2988330B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102430594A (en) * | 2011-09-21 | 2012-05-02 | 河北省首钢迁安钢铁有限责任公司 | Method for eliminating loop rise of thin gauge strip on layer-cold roller way |
| CN102430594B (en) * | 2011-09-21 | 2013-07-17 | 河北省首钢迁安钢铁有限责任公司 | Method for eliminating loop rise of thin gauge strip on layer-cold roller way |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0910812A (en) | 1997-01-14 |
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