JPH0813046A - Method for controlling metal strip temperature in cooling zone of continuous annealing furnace - Google Patents

Method for controlling metal strip temperature in cooling zone of continuous annealing furnace

Info

Publication number
JPH0813046A
JPH0813046A JP14757394A JP14757394A JPH0813046A JP H0813046 A JPH0813046 A JP H0813046A JP 14757394 A JP14757394 A JP 14757394A JP 14757394 A JP14757394 A JP 14757394A JP H0813046 A JPH0813046 A JP H0813046A
Authority
JP
Japan
Prior art keywords
metal strip
chamber
width direction
temperature
cooling zone
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.)
Granted
Application number
JP14757394A
Other languages
Japanese (ja)
Other versions
JP3069494B2 (en
Inventor
Nobuyuki Eguchi
信之 江口
Futahiko Nakagawa
二彦 中川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Original Assignee
Kawasaki Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Priority to JP6147573A priority Critical patent/JP3069494B2/en
Publication of JPH0813046A publication Critical patent/JPH0813046A/en
Application granted granted Critical
Publication of JP3069494B2 publication Critical patent/JP3069494B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Control Of Heat Treatment Processes (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

PURPOSE:To surely control the temp. distribution in the widthwise direction of a strip by supplying cooling gas to plural chambers at a specific blowing pressure and adjusting damper opening degree corresponding to the aimed temp. distribution pattern for each chamber. CONSTITUTION:The metal strip 1 is cooled by blowing the cooling gas from plural chambers 3 arranged in the widthwise direction thereof in the cooling zone of a continuous annealing furnace. At that time, for the purpose of controlling the temp. distribution for cooling in the widthwise direction of the metal strip, first the blowing pressure is set with the aimed temp. at the center part of the metal strip as reference according to the aimed temp. distribution pattern decided based on the information of the metal strip 1, then this set pressure is inputted to a temp. controller 6 and a gas jet fan 8 is controlled through a rotating speed control device 7 to supply the cooling gas to each chamber 3 with the above pressure. Further, the blowing pressure is calculated for each chamber 3 corresponding to the aimed temp. distribution pattern. The opening degree of the damper 10 for each chamber is adjusted through an opening degree controller 9 according to this pressure.

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、冷延鋼板などの金属ス
トリップの製造ラインに設置する連続焼鈍炉の冷却帯、
特に金属ストリップの幅方向に配列した複数のチャンバ
ーを介して冷却ガスを吹きつけて金属ストリップを冷却
する形式の冷却帯における、金属ストリップ幅方向の温
度の制御方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling zone for a continuous annealing furnace installed in a production line for metal strips such as cold rolled steel sheets,
In particular, the present invention relates to a method for controlling a temperature in the width direction of a metal strip in a cooling zone of a type in which a cooling gas is blown through a plurality of chambers arranged in the width direction of the metal strip to cool the metal strip.

【0002】[0002]

【従来の技術】冷却ガスの吹きつけを利用した冷却帯に
おける金属ストリップ温度の制御は、冷却帯に導入する
金属ストリップに関する情報、例えば厚み、幅および鋼
種などの寸法や材質に関する情報、または操業条件が変
化したときに、冷却ガスの吹きつけ圧力を変化させて行
うのが一般的である。特に、金属ストリップ幅方向の温
度分布を均一にし、製品の均質化や形状制御、中でも次
工程における冷却ロール通過時に発生する冷却むらを事
前に防いで形状不良や絞りを発生させないため、金属ス
トリップの幅方向に冷却ガス吹きつけ用のチャンバを複
数配列し、各チャンバ内のダンパを開閉調節している。
2. Description of the Related Art Control of the temperature of a metal strip in a cooling zone by using a blowing of a cooling gas is performed by information on the metal strip introduced into the cooling zone, for example, information on dimensions and materials such as thickness, width and steel grade, or operating conditions. It is common to change the blowing pressure of the cooling gas when the temperature changes. In particular, the temperature distribution in the width direction of the metal strip is made uniform, the product is homogenized and the shape is controlled, and in particular, uneven cooling that occurs when passing through a cooling roll in the next process is prevented in advance to prevent defective shapes and drawing. A plurality of chambers for blowing cooling gas are arranged in the width direction, and a damper in each chamber is opened and closed.

【0003】このダンパの開閉調節は、例えば、金属ス
トリップに関する情報に基づいてダンパ開度を固定値と
して出力して行うことが一般的であるが、操業条件の変
化や設備の経年変化によって、設定したダンパ開度で対
応できなくなることが多々あり、柔軟な温度制御が必要
不可欠になってきている。
The opening / closing adjustment of the damper is generally performed, for example, by outputting the damper opening as a fixed value based on the information about the metal strip. However, the damper opening / closing is set according to changes in operating conditions or changes in equipment over time. In many cases, it is not possible to cope with such damper opening, and flexible temperature control is becoming indispensable.

【0004】金属ストリップの幅方向の温度制御に関し
て、特開昭60−169524号公報には、金属ストリップ幅方
向の温度実績と幅方向の平均温度との差が許容限界を超
えた位置に対応してダンパを調節することが開示されて
いる。この技術は金属ストリップ幅方向の温度を平均
化、すなわち均一に制御するものであり、金属ストリッ
プ幅方向の温度分布は均一パターンとなる。
Regarding the temperature control in the width direction of the metal strip, Japanese Patent Laid-Open No. 60-169524 corresponds to the position where the difference between the actual temperature in the width direction of the metal strip and the average temperature in the width direction exceeds the allowable limit. The adjustment of the damper is disclosed. This technique averages the temperature in the width direction of the metal strip, that is, controls it uniformly, and the temperature distribution in the width direction of the metal strip becomes a uniform pattern.

【0005】[0005]

【発明が解決しようとする課題】確かに、金属ストリッ
プ幅方向の温度分布を均一化することは重要であるが、
操業条件によっては、幅端域の温度を中央域より高くす
る温度分布パターンが求められることもある。例えば、
幅端域に必要以上の冷却を行うと、その部分のストリッ
プの長手方向の収縮が進み耳のびを助長することがあ
り、その場合には、幅端域の温度を中央域の温度より高
くする必要がある。このように、金属ストリップの幅方
向の温度分布を単純に均一化するだけではなく、板の寸
法、操業条件によって目的とする温度分布を与えること
により、形状不良を防止することが必要になる。
Although it is important to make the temperature distribution in the width direction of the metal strip uniform,
Depending on operating conditions, a temperature distribution pattern that makes the temperature in the width end region higher than that in the central region may be required. For example,
If excessive cooling is applied to the width end region, the strip in that part may contract in the longitudinal direction to promote ear lobe, in which case the temperature in the width end region is made higher than the temperature in the center region. There is a need. As described above, it is necessary to prevent the shape defect by not only simply equalizing the temperature distribution in the width direction of the metal strip but also by providing a desired temperature distribution according to the size and operating conditions of the plate.

【0006】従って、上記の従来技術では、金属ストリ
ップ幅方向の温度分布を種々に変更制御することは難し
く、この点が残る課題となっていた。さらに、従来技術
は、金属ストリップ温度をフィードバック制御している
ため、温度制御条件の変更直前の金属ストリップの温度
制御が不完全になる不利がある。
Therefore, in the above-mentioned prior art, it is difficult to change and control the temperature distribution in the width direction of the metal strip in various ways, and this problem remains. Further, in the conventional technique, since the metal strip temperature is feedback-controlled, there is a disadvantage that the temperature control of the metal strip immediately before the change of the temperature control condition becomes incomplete.

【0007】そこで、本発明は、上記の問題を解決し
た、冷却ガスの吹きつけを利用する冷却帯における金属
ストリップ幅方向の温度分布の制御方法について提案す
ることを目的とする。
Therefore, an object of the present invention is to propose a method of controlling the temperature distribution in the width direction of a metal strip in a cooling zone utilizing the blowing of a cooling gas, which solves the above problems.

【0008】[0008]

【課題を解決するための手段】本発明は、連続焼鈍炉の
冷却帯で金属ストリップの幅方向に配列した複数のチャ
ンバーを介して金属ストリップに冷却ガスを吹きつけ
て、その幅方向温度分布を制御するに当たり、目標とす
る温度分布パターンに従う金属ストリップ中央部の目標
温度を基準に設定した吹きつけ圧力の下に冷却ガスを各
チャンバーに供給し、さらに目標温度分布パターンに対
応して各チャンバー毎に決定される吹きつけ圧力に従っ
て、各チャンバーのダンパ開度を調節することを特徴と
する連続焼鈍炉の冷却帯における金属ストリップ温度の
制御方法である。
According to the present invention, a cooling gas is blown to a metal strip through a plurality of chambers arranged in the width direction of the metal strip in a cooling zone of a continuous annealing furnace so that a temperature distribution in the width direction is obtained. In controlling, the cooling gas is supplied to each chamber under the blowing pressure set based on the target temperature of the central part of the metal strip according to the target temperature distribution pattern, and further for each chamber according to the target temperature distribution pattern. A method for controlling the temperature of a metal strip in a cooling zone of a continuous annealing furnace, which is characterized in that a damper opening degree of each chamber is adjusted according to a blowing pressure determined in step S4.

【0009】また、本発明は、上記の制御方法におい
て、冷却帯の出側にて放射温度計により金属ストリップ
中央部の温度を測定するとともに、プロフィール放射温
度計により金属ストリップ幅方向の温度分布を測定し、
まず金属ストリップ中央部の測定温度と金属ストリップ
中央部の目標温度との差に応じて各チャンバーへの冷却
ガスの供給圧力を調整するとともに、金属ストリップ幅
方向の測定温度分布と金属ストリップ幅方向の目標温度
分布との差異に応じて各チャンバーのダンパ開度を調整
することを特徴とする連続焼鈍炉の冷却帯における金属
ストリップ温度の制御方法である。
According to the present invention, in the above control method, the temperature of the central portion of the metal strip is measured by the radiation thermometer on the outlet side of the cooling zone, and the temperature distribution in the width direction of the metal strip is measured by the profile radiation thermometer. Measure
First, the supply pressure of the cooling gas to each chamber is adjusted according to the difference between the measured temperature at the center of the metal strip and the target temperature at the center of the metal strip. A method for controlling a metal strip temperature in a cooling zone of a continuous annealing furnace, characterized in that a damper opening of each chamber is adjusted according to a difference from a target temperature distribution.

【0010】ここで、実施に当たり、各チャンバーにお
けるダンバ開度を、隣接するチャンバーのダンパ開度調
節による影響を考慮して補正すること、冷却帯の出側に
て測定した金属ストリップ幅方向の温度分布と冷却帯の
入側にて測定した金属ストリップ幅方向の温度分布との
比較から求めた金属ストリップ幅方向での熱伝達係数に
基づいて、各チャンバーでの吹きつけ圧力を決定するこ
と、この場合は、特に冷却帯の出側にて測定した金属ス
トリップ幅方向の温度分布と目標温度分布との差から熱
伝達係数の評価を行う、学習計算によって、金属ストリ
ップ幅方向の熱伝達係数と各チャンバーでの吹きつけ圧
力との関係を表す学習パラメータを修正すること、が有
利に適合する。
Here, in the implementation, the damper opening in each chamber should be corrected in consideration of the influence of the damper opening adjustment of the adjacent chamber, and the temperature in the width direction of the metal strip measured at the outlet side of the cooling zone. Determining the blowing pressure in each chamber based on the heat transfer coefficient in the width direction of the metal strip obtained by comparing the distribution and the temperature distribution in the width direction of the metal strip measured at the inlet side of the cooling zone. In this case, the heat transfer coefficient is evaluated from the difference between the temperature distribution in the width direction of the metal strip measured on the outlet side of the cooling zone and the target temperature distribution. Modifying the learning parameter, which is related to the blowing pressure in the chamber, is advantageously adapted.

【0011】次に、本発明の制御方法について、詳しく
説明する。まず、図1に示す冷却帯に、本発明を適用す
る際の設備構成を図2に示す。図1において、金属スト
リップ1は、ハースロール2を介して、この例で下から
上へ通板されて冷却帯内に導かれ、金属ストリップ1の
幅方向に複数のチャンバー3を配列しなる冷却装置4の
列間を通り、さらにハースロール2で向きを変えて上か
ら下に通板され、最後の冷却装置4を通り、次工程の冷
却ロール5に至る。
Next, the control method of the present invention will be described in detail. First, FIG. 2 shows an equipment configuration when the present invention is applied to the cooling zone shown in FIG. In FIG. 1, a metal strip 1 is passed through a hearth roll 2 in this example from the bottom to the top to be introduced into a cooling zone, and cooling is performed by arranging a plurality of chambers 3 in the width direction of the metal strip 1. After passing between the rows of the apparatus 4, the direction is further changed by the hearth roll 2 and the sheet is passed from the top to the bottom, passes through the last cooling apparatus 4, and reaches the cooling roller 5 of the next step.

【0012】上記の冷却帯において、冷却装置4におけ
る冷却ガスによる冷却量、すなわち冷却ガスの吹きつけ
圧力は、図2に示すように、金属ストリップの情報に基
づいて決定した目標温度分布パターンに従って、始めに
金属ストリップ中央部の目標温度を基準に設定した吹き
つけ圧力を、温度制御コントローラ6に入力して、回転
速度制御装置7を介してガスジェットファン8を制御し
て、該吹きつけ圧力で冷却ガスを各チャンバー3に供給
し、さらに目標温度分布パターンに対応して各チャンバ
ー3毎に決定される吹きつけ圧力に基づいて、設定ダン
パ開度を計算し、開度コントローラ9を介して各チャン
バー3のダンパ10の開度を調整し、冷却ガスの吹きつけ
を行う。なお、金属ストリップ中央部に向けたチャンバ
ー3のダンパ開度は全開とする。
In the above cooling zone, the cooling amount of the cooling gas in the cooling device 4, that is, the blowing pressure of the cooling gas, as shown in FIG. 2, follows the target temperature distribution pattern determined based on the information of the metal strip. First, the blowing pressure set based on the target temperature of the central portion of the metal strip is input to the temperature controller 6, and the gas jet fan 8 is controlled via the rotation speed control device 7 to control the blowing pressure. The cooling gas is supplied to each chamber 3, and the set damper opening is calculated based on the blowing pressure determined for each chamber 3 in accordance with the target temperature distribution pattern, and each damper opening is calculated via the opening controller 9. The opening of the damper 10 of the chamber 3 is adjusted and the cooling gas is sprayed. The damper opening of the chamber 3 toward the center of the metal strip is fully opened.

【0013】以上の基本設定の下に操業を行うが、操業
中は、種々の寸法の金属ストリップが導入される上、操
業条件の変更などもあり、次の制御を加えた操業を行う
ことが実際的である。すなわち、図1に示すように、冷
却帯の出側もしくは次工程の冷却ロール5の出側に、金
属ストリップ1の中央部の温度を測定する放射温度計11
および金属ストリップ1の幅方向の温度分布を測定する
プロフィール放射温度計12を配置し、まず金属ストリッ
プ1中央部の測定温度を温度制御コントローラ6に入力
し、該測定温度と金属ストリップ中央部の目標温度とを
比較し、その差に応じて、回転速度制御装置7を介し
て、各チャンバーへの冷却ガスの供給圧力をガスジェッ
トファン8において調整する。
The operation is performed under the above basic settings. During the operation, metal strips of various sizes are introduced and the operating conditions are changed. Therefore, the operation with the following control may be performed. It is practical. That is, as shown in FIG. 1, a radiation thermometer 11 for measuring the temperature of the central portion of the metal strip 1 on the exit side of the cooling zone or the exit side of the cooling roll 5 in the next step.
A profile radiation thermometer 12 for measuring the temperature distribution in the width direction of the metal strip 1 is arranged. First, the measured temperature of the central portion of the metal strip 1 is input to the temperature controller 6, and the measured temperature and the target of the central portion of the metal strip are input. The temperature is compared, and the supply pressure of the cooling gas to each chamber is adjusted in the gas jet fan 8 via the rotation speed control device 7 according to the difference.

【0014】さらに、プロフィール放射温度計12で測定
した金属ストリップ幅方向の温度分布と金属ストリップ
幅方向の目標温度分布との差異に応じて、各チャンバー
3のダンパ開度の調整を行う。このダンパ開度の調整
は、演算器13内において、次の手順に従って実施する。
Further, the damper opening of each chamber 3 is adjusted in accordance with the difference between the temperature distribution in the width direction of the metal strip measured by the profile radiation thermometer 12 and the target temperature distribution in the width direction of the metal strip. The adjustment of the damper opening is performed in the calculator 13 according to the following procedure.

【0015】まず、放射温度計11による金属ストリップ
1中央部の測定温度と冷却帯入側に設けた温度計14での
測定値とから、金属ストリップ1中央部の熱伝達量を算
出して中央部の熱伝達量と吹きつけ圧力との関係を求め
ておき、さらに各チャンバー3毎に設置した圧力計15に
よる金属ストリップ1中央部の吹きつけ圧力測定値か
ら、上記熱伝達量と吹きつけ圧力との関係を示す学習パ
ラメータを修正する。同様に、金属ストリップ1幅方向
の温度と冷却帯入側の放射温度計14の測定値(冷却帯入
側においては金属ストリップの中央部も端部も同じ温度
とみなせる)とから、幅方向の各点における熱伝達量を
算出して幅方向各点の熱伝達量と吹きつけ圧力との関係
を求めておき、さらに各チャンバー3毎に設定した圧力
計15による幅方向の吹きつけ圧力の測定値から、幅方向
各点の熱伝達量と吹きつけ圧力との関係を示す学習パラ
メータを修正する。
First, from the temperature measured by the radiation thermometer 11 at the central portion of the metal strip 1 and the value measured by the thermometer 14 provided on the cooling zone entrance side, the heat transfer amount at the central portion of the metal strip 1 is calculated and the central portion is calculated. The relationship between the heat transfer amount and the spray pressure of the part is obtained in advance, and the heat transfer amount and the spray pressure are measured from the measured values of the spray pressure at the central part of the metal strip 1 by the pressure gauges 15 installed in each chamber 3. Modify the learning parameters that show the relationship with. Similarly, from the temperature in the width direction of the metal strip 1 and the measured value of the radiation thermometer 14 on the cooling zone entrance side (on the cooling zone entrance side, the central portion and the end portion of the metal strip can be regarded as the same temperature), the width direction The amount of heat transfer at each point is calculated to obtain the relationship between the amount of heat transfer at each point in the width direction and the blowing pressure, and the blowing pressure in the width direction is measured by the pressure gauge 15 set for each chamber 3. From the value, the learning parameter indicating the relationship between the heat transfer amount at each point in the width direction and the blowing pressure is corrected.

【0016】そして、演算器13では、金属ストリップ情
報を受け取ると、冷却帯出側の中央および幅方向の目標
温度を設定する。なお、上述したように、金属ストリッ
プ1中央部の目標温度は、そのまま所定のタイミングで
温度制御コントローラ6に出力するので、そのタイミン
グの取り方を決めれば、フィードフォワード的な制御が
可能である。
Upon receipt of the metal strip information, the calculator 13 sets the target temperature in the center and the width direction of the cooling zone. As described above, the target temperature of the central portion of the metal strip 1 is output to the temperature controller 6 as it is at a predetermined timing, so that feedforward control is possible if the timing is determined.

【0017】一方、金属ストリップ1の幅方向における
各チャンバーのダンパ開度の設定および上記した学習パ
ラメータの修正は、図3および4に示すように、演算器
13内において、金属ストリップ情報、冷却帯出側の各温
度計および同入側の温度計14での測定値、さらには吹き
つけガス温度16およびライン速度17から、必要な熱伝達
量を求める。このようにして求めた、熱伝達量と吹きつ
け圧力との関係を示す、金属ストリップの中央部および
幅方向の該当点における、少なくとも1つの学習パラメ
ータを使って、必要な熱伝達量に対応する吹きつけ圧力
を、ストリップ幅方向のチャンバー3毎に求め、その吹
きつけ圧力を得るダンパ開度を全てのダンパ10について
求めて調整すれば、目標とする金属ストリップ幅方向の
温度分布が得られる。
On the other hand, as shown in FIGS. 3 and 4, the setting of the damper opening of each chamber in the width direction of the metal strip 1 and the correction of the above-mentioned learning parameters are performed by a calculator.
In 13, the required heat transfer amount is determined from the metal strip information, the measured values at the thermometers on the outlet side of the cooling zone and the thermometers 14 on the inlet side, and the blowing gas temperature 16 and the line speed 17. At least one learning parameter at the corresponding point in the central portion and the width direction of the metal strip, which shows the relationship between the heat transfer amount and the blowing pressure thus obtained, is used to correspond to the necessary heat transfer amount. If the blowing pressure is obtained for each chamber 3 in the strip width direction and the damper opening for obtaining the blowing pressure is obtained and adjusted for all the dampers 10, a target temperature distribution in the metal strip width direction can be obtained.

【0018】ここで、金属ストリップ中央部の吹きつけ
圧力は、中央部の目標温度が変化すれば変化し、ストリ
ップ幅方向に分布する各チャンバの吹きつけ圧力にも当
然影響がでるため、金属ストリップ中央部の吹きつけ圧
力に応じてダンパ開度を補正する必要がある。そして、
調整後のダンパ開度によっては、隣接チャンバー相互で
の吹きつけ圧力に影響があるため、隣接するダンパ開度
に応じてダンパの開度をさらに補正することが、好まし
い。すなわち、あるチャンバーの開度が小さくなると、
そのチャンバーを流れていたガスの一部が隣接チャンバ
−に流れ込むことになり、同じダンパー開度で、かつ同
じガスジェットファンの回転数であったとしても、その
チャンバーの圧力が上昇することになる。したがって、
隣接するチャンバーの開度に応じた圧力を、目標とする
チャンバー圧力から割り引いて補正するものである。
Here, the blowing pressure at the central portion of the metal strip changes if the target temperature at the central portion changes, and naturally affects the blowing pressure of each chamber distributed in the strip width direction. It is necessary to correct the damper opening according to the blowing pressure at the center. And
Depending on the adjusted damper opening, the blowing pressure between the adjacent chambers is affected, so it is preferable to further correct the damper opening according to the adjacent damper opening. That is, when the opening of a certain chamber becomes smaller,
Part of the gas flowing in the chamber will flow into the adjacent chamber, and even if the damper opening is the same and the gas jet fan speed is the same, the pressure in the chamber rises. . Therefore,
The pressure according to the opening degree of the adjacent chamber is discounted from the target chamber pressure and corrected.

【0019】[0019]

【作用】本発明は、主に金属ストリップの情報から、目
標とする温度分布パターンを決定し、まず金属ストリッ
プの中央部の目標温度に基づいて全体の冷却ガス吹きつ
け圧力を設定し、さらにストリップ幅方向の各位置にお
ける目標温度に基づいて、各チャンバーで必要となる冷
却ガスの吹きつけ圧力を、例えば熱伝達量を用いて計算
し、その吹きつけ圧力に応じてダンパ開度を調整するよ
うにしたから、目標温度の設定を自由に、例えば金属ス
トリップの冷却帯導入順に、決定でき、従って目標温度
分布も均一パターンだけでなく、金属ストリップ端部の
温度を高めにしたり、逆に中央部の温度を高めにした、
温度分布のパターンを任意に実現できる。
According to the present invention, the target temperature distribution pattern is determined mainly from the information of the metal strip, and first the total cooling gas blowing pressure is set based on the target temperature of the central portion of the metal strip, and the strip temperature is further set. Based on the target temperature at each position in the width direction, the blowing pressure of the cooling gas required in each chamber is calculated using, for example, the heat transfer amount, and the damper opening is adjusted according to the blowing pressure. Therefore, it is possible to freely set the target temperature, for example, in the order of introducing the cooling zone of the metal strip. Therefore, the target temperature distribution is not only a uniform pattern, but the temperature at the end of the metal strip can be increased or conversely the central part. Raised the temperature of
A pattern of temperature distribution can be realized arbitrarily.

【0020】また、冷却帯出側の金属ストリップ幅方向
の測定温度から算出した熱伝達量と吹きつけ圧力との関
係を示すパラメーターに従って吹きつけ圧力を決定する
に当たり、該パラメーターを上記金属ストリップ幅方向
の温度および吹きつけ圧力の測定値による学習計算にて
調整するようにした場合は、操業条件の変化、また設備
の経年的な変化に対しても、自動的に制御項目の調整を
行うことができる。
In determining the blowing pressure according to the parameter indicating the relationship between the heat transfer amount and the blowing pressure calculated from the measured temperature in the width direction of the metal strip on the outlet side of the cooling zone, the parameter is set in the width direction of the metal strip. When adjustment is made by learning calculation based on measured values of temperature and spray pressure, control items can be automatically adjusted even with changes in operating conditions and changes over time in equipment. .

【0021】さらに、吹きつけ圧力とダンパ開度の関係
を、金属ストリップ中央部の目標温度を基準に設定した
吹きつけ圧力に応じて補正する場合に、隣接ダンパから
の影響分も補正するようにしたから、金属ストリップ中
央部の吹きつけ圧力が操業状況によって変化しても、そ
れに応じたダンパ開度が設定できる。
Further, when the relationship between the blowing pressure and the damper opening is corrected according to the blowing pressure set with reference to the target temperature of the central portion of the metal strip, the influence from the adjacent damper is also corrected. Therefore, even if the blowing pressure at the central portion of the metal strip changes depending on the operating conditions, the damper opening can be set accordingly.

【0022】[0022]

【実施例】図5に、本発明を適用した冷却帯での制御例
を示す。同図は、A点において、金属ストリップ中央部
の目標温度を下げ、かつストリップ端部の温度を高めに
制御する場合を示し、A点手前の材料変更点が冷却帯入
側に達した時点A1 であらかじめ目標温度を下げるに伴
い、ガスジェットファン回転数を増加させた。次に、金
属ストリップ幅方向に配列した各チャンバのダンパ開度
は、所定の温度に冷却するための吹きつけ圧力を得るた
めに微調整を行うが、金属ストリップ端部の温度を高め
に制御するため、幅方向外側のダンパ開度を狭く調整し
た。すなわち、図5のA点より前のXの時点からAより
後のYの時点の変化をみると、金属ストリップ中央部の
温度を下げるため、ガスジェットファンの回転数が高く
なり、吹きつけ圧力も全体として高くなっているが、金
属ストリップ幅方向の外側域を内側域よりも高めの
温度に制御をするために、外側域でのダンパ開度は同
に対して、やや閉じぎみの制御を行った。
FIG. 5 shows an example of control in a cooling zone to which the present invention is applied. This figure shows a case where the target temperature at the center of the metal strip is lowered and the temperature at the end of the strip is controlled to be higher at point A, and when the material change point before point A reaches the cooling zone entry side A In 1 , the gas jet fan speed was increased as the target temperature was lowered in advance. Next, the damper opening of each chamber arranged in the width direction of the metal strip is finely adjusted in order to obtain a blowing pressure for cooling to a predetermined temperature, but the temperature at the end of the metal strip is controlled to be higher. Therefore, the damper opening on the outer side in the width direction is adjusted to be narrow. That is, looking at the change from the time point X before the point A to the time point Y after the point A in FIG. 5, since the temperature of the central portion of the metal strip is lowered, the rotational speed of the gas jet fan is increased and the blowing pressure is increased. However, in order to control the temperature in the outer region in the width direction of the metal strip to be higher than that in the inner region, the damper opening in the outer region is the same, but a slightly closed control is required. went.

【0023】同図上部に示した棒グラフは、X,Y点の
プロフィール温度であるが、このグラフから、上記の制
御によって、金属ストリップ中央部の温度が低くかつス
トリップ端部の温度の高い、温度分布が得られたことが
わかる。
The bar graph shown in the upper part of the figure shows the profile temperature at the X and Y points. From this graph, the temperature at which the central portion of the metal strip is low and the temperature at the end portion of the metal strip is high by the above control. It can be seen that the distribution was obtained.

【0024】[0024]

【発明の効果】本発明の冷却制御によれば、目標温度設
定の変更点および目標温度分布のパターンは、上位演算
装置13において決定でき、ガスジェットファンの回転数
を主体に冷却温度制御を行う設備においてもダンパ開度
の調整を並行して幅方向の温度分布が制御できるように
なった。また、学習パラメータを調整することで設備の
経年的な変化に対しても自動調整ができる効果もある。
According to the cooling control of the present invention, the change point of the target temperature setting and the pattern of the target temperature distribution can be determined by the host computer 13, and the cooling temperature control is performed mainly by the rotation speed of the gas jet fan. Even in the equipment, the temperature distribution in the width direction can be controlled while adjusting the damper opening. Moreover, there is also an effect that the learning parameter can be adjusted to automatically adjust even with a change over time of the equipment.

【図面の簡単な説明】[Brief description of drawings]

【図1】冷却帯を示す模式図である。FIG. 1 is a schematic view showing a cooling zone.

【図2】本発明に従う制御方法を適用した設備構成を示
す模式図である。
FIG. 2 is a schematic diagram showing an equipment configuration to which a control method according to the present invention is applied.

【図3】演算器におけるダンパ開度の計算過程を示すフ
ローチャートである。
FIG. 3 is a flowchart showing a process of calculating a damper opening degree in a computing unit.

【図4】演算器における学習計算の過程を示すフローチ
ャートである。
FIG. 4 is a flowchart showing a process of learning calculation in a computing unit.

【図5】本発明の実施例を示す図である。FIG. 5 is a diagram showing an example of the present invention.

【符号の説明】[Explanation of symbols]

1 金属ストリップ 2 ハースロール 3 チャンバー 4 冷却装置 5 冷却ロール 6 温度制御コントローラ 7 回転速度制御装置 8 ガスジェットファン 9 開度コントローラ 10 ダンパ 11 放射温度計 12 プロフィール放射温度計 13 演算器 14 放射温度計 15 圧力計 16 吹きつけガス温度(計) 17 ライン速度実績 18 冷却ガス配管 1 Metal Strip 2 Hearth Roll 3 Chamber 4 Cooling Device 5 Cooling Roll 6 Temperature Control Controller 7 Rotation Speed Control Device 8 Gas Jet Fan 9 Opening Controller 10 Damper 11 Radiation Thermometer 12 Profile Radiation Thermometer 13 Computing Unit 14 Radiation Thermometer 15 Pressure gauge 16 Blow gas temperature (total) 17 Line speed record 18 Cooling gas piping

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】 連続焼鈍炉の冷却帯で金属ストリップの
幅方向に配列した複数のチャンバーを介して金属ストリ
ップに冷却ガスを吹きつけて、その幅方向温度分布を制
御するに当たり、目標とする温度分布パターンに従う金
属ストリップ中央部の目標温度を基準に設定した吹きつ
け圧力の下に冷却ガスを各チャンバーに供給し、さらに
目標温度分布パターンに対応して各チャンバー毎に決定
される吹きつけ圧力に従って、各チャンバーのダンパ開
度を調節することを特徴とする連続焼鈍炉の冷却帯にお
ける金属ストリップ温度の制御方法。
1. A target temperature for controlling a widthwise temperature distribution by blowing a cooling gas to a metal strip through a plurality of chambers arranged in the widthwise direction of the metal strip in a cooling zone of a continuous annealing furnace. Cooling gas is supplied to each chamber under the blowing pressure set based on the target temperature at the center of the metal strip according to the distribution pattern, and according to the blowing pressure determined for each chamber according to the target temperature distribution pattern. , A method for controlling a metal strip temperature in a cooling zone of a continuous annealing furnace, characterized in that a damper opening of each chamber is adjusted.
【請求項2】 請求項1に記載の制御方法において、冷
却帯の出側にて放射温度計により金属ストリップ中央部
の温度を測定するとともに、プロフィール放射温度計に
より金属ストリップ幅方向の温度分布を測定し、まず金
属ストリップ中央部の測定温度と金属ストリップ中央部
の目標温度との差に応じて各チャンバーへの冷却ガスの
供給圧力を調整するとともに、金属ストリップ幅方向の
測定温度分布と金属ストリップ幅方向の目標温度分布と
の差異に応じて各チャンバーのダンパ開度を調整するこ
とを特徴とする連続焼鈍炉の冷却帯における金属ストリ
ップ温度の制御方法。
2. The control method according to claim 1, wherein the temperature of the central portion of the metal strip is measured by the radiation thermometer on the outlet side of the cooling zone, and the temperature distribution in the width direction of the metal strip is measured by the profile radiation thermometer. First, the supply pressure of the cooling gas to each chamber is adjusted according to the difference between the measured temperature at the center of the metal strip and the target temperature at the center of the metal strip, and the measured temperature distribution in the width direction of the metal strip and the metal strip are adjusted. A method for controlling a metal strip temperature in a cooling zone of a continuous annealing furnace, which comprises adjusting a damper opening of each chamber according to a difference from a target temperature distribution in the width direction.
【請求項3】 各チャンバーにおけるダンバ開度を、隣
接するチャンバーのダンパ開度調節による影響を考慮し
て補正する、請求項1または2に記載の制御方法。
3. The control method according to claim 1, wherein the damper opening in each chamber is corrected in consideration of the influence of the damper opening adjustment of an adjacent chamber.
【請求項4】 冷却帯の出側にて測定した金属ストリッ
プ幅方向の温度分布と冷却帯の入側にて測定した金属ス
トリップ幅方向の温度分布との比較から求めた金属スト
リップ幅方向での熱伝達係数に基づいて、各チャンバー
での吹きつけ圧力を決定する請求項1または2に記載の
制御方法。
4. The metal strip width direction obtained by comparing the temperature distribution in the metal strip width direction measured at the outlet side of the cooling zone with the temperature distribution in the metal strip width direction measured at the inlet side of the cooling zone. The control method according to claim 1 or 2, wherein the blowing pressure in each chamber is determined based on the heat transfer coefficient.
【請求項5】 冷却帯の出側にて測定した金属ストリッ
プ幅方向の温度分布と目標温度分布との差から熱伝達係
数の評価を行う、学習計算によって、金属ストリップ幅
方向の熱伝達係数と各チャンバーでの吹きつけ圧力との
関係を表す学習パラメータを修正する、請求項4に記載
の制御方法。
5. The coefficient of heat transfer is evaluated from the difference between the temperature distribution in the width direction of the metal strip measured on the outlet side of the cooling zone and the target temperature distribution. The control method according to claim 4, wherein a learning parameter representing a relationship with a blowing pressure in each chamber is modified.
JP6147573A 1994-06-29 1994-06-29 Control method of metal strip temperature in cooling zone of continuous annealing furnace Expired - Lifetime JP3069494B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6147573A JP3069494B2 (en) 1994-06-29 1994-06-29 Control method of metal strip temperature in cooling zone of continuous annealing furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6147573A JP3069494B2 (en) 1994-06-29 1994-06-29 Control method of metal strip temperature in cooling zone of continuous annealing furnace

Publications (2)

Publication Number Publication Date
JPH0813046A true JPH0813046A (en) 1996-01-16
JP3069494B2 JP3069494B2 (en) 2000-07-24

Family

ID=15433423

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Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997044498A1 (en) * 1996-05-23 1997-11-27 Nippon Steel Corporation Widthwise uniform cooling system for steel strip in continuous steel strip heat treatment step
KR100529055B1 (en) * 2001-12-07 2005-11-15 주식회사 포스코 Device for cooling strip in continuous annealing furnace
FR2897620A1 (en) * 2006-02-21 2007-08-24 Stein Heurtey Cooling and stabilization of metal strip in a continuous heat treatment line by controlling the pressure in gas blown cooling boxes to provide a given cooling curve along the cooling length
US8025835B2 (en) 2007-07-31 2011-09-27 ArcelorMittal Investigación y Desarrollo, S.L. Furnace configured for use in both the galvannealing and galvanizing of a metal strip
WO2013089422A1 (en) * 2011-12-15 2013-06-20 (주)포스코 Method and apparatus for controlling the strip temperature of the rapid cooling section of a continuous annealing line
US9234255B2 (en) 2010-01-29 2016-01-12 Tata Steel Nederland Technology Bv Process for the heat treatment of metal strip material
CN113310309A (en) * 2021-06-01 2021-08-27 北京北方华创微电子装备有限公司 Vertical furnace and furnace body temperature control method thereof

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997044498A1 (en) * 1996-05-23 1997-11-27 Nippon Steel Corporation Widthwise uniform cooling system for steel strip in continuous steel strip heat treatment step
US6054095A (en) * 1996-05-23 2000-04-25 Nippon Steel Corporation Widthwise uniform cooling system for steel strip in continuous steel strip heat treatment step
KR100529055B1 (en) * 2001-12-07 2005-11-15 주식회사 포스코 Device for cooling strip in continuous annealing furnace
FR2897620A1 (en) * 2006-02-21 2007-08-24 Stein Heurtey Cooling and stabilization of metal strip in a continuous heat treatment line by controlling the pressure in gas blown cooling boxes to provide a given cooling curve along the cooling length
WO2007096502A2 (en) 2006-02-21 2007-08-30 Fives Stein Method and device for cooling and stabilizing strip in a continuous line
WO2007096502A3 (en) * 2006-02-21 2007-11-01 Stein Heurtey Method and device for cooling and stabilizing strip in a continuous line
US8025835B2 (en) 2007-07-31 2011-09-27 ArcelorMittal Investigación y Desarrollo, S.L. Furnace configured for use in both the galvannealing and galvanizing of a metal strip
US9234255B2 (en) 2010-01-29 2016-01-12 Tata Steel Nederland Technology Bv Process for the heat treatment of metal strip material
WO2013089422A1 (en) * 2011-12-15 2013-06-20 (주)포스코 Method and apparatus for controlling the strip temperature of the rapid cooling section of a continuous annealing line
JP2015504973A (en) * 2011-12-15 2015-02-16 ポスコ Method and apparatus for controlling strip temperature in quench zone in continuous annealing line
US9783867B2 (en) 2011-12-15 2017-10-10 Posco Method and apparatus for controlling the strip temperature of the rapid cooling section of a continuous annealing line
CN113310309A (en) * 2021-06-01 2021-08-27 北京北方华创微电子装备有限公司 Vertical furnace and furnace body temperature control method thereof

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