JPH11267730A - Device for controlling temperature of hot rolled sheet and its method - Google Patents
Device for controlling temperature of hot rolled sheet and its methodInfo
- Publication number
- JPH11267730A JPH11267730A JP10076067A JP7606798A JPH11267730A JP H11267730 A JPH11267730 A JP H11267730A JP 10076067 A JP10076067 A JP 10076067A JP 7606798 A JP7606798 A JP 7606798A JP H11267730 A JPH11267730 A JP H11267730A
- Authority
- JP
- Japan
- Prior art keywords
- stands
- steel sheet
- thermometer
- temperature
- cooling
- 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.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
- B21B2013/003—Inactive rolling stands
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、熱延鋼板の温度制
御装置及びその方法に関する。The present invention relates to an apparatus and a method for controlling the temperature of a hot-rolled steel sheet.
【０００２】[0002]
【従来の技術】熱延鋼板の機械的性質や製品材質の品質
を決定する上で、鋼板についての仕上圧延終了直後の温
度及び巻取り直前の温度は重要な因子であり、これを高
精度で制御することが重要である。2. Description of the Related Art In determining the mechanical properties and quality of a product material of a hot-rolled steel sheet, the temperature immediately after finishing rolling of the steel sheet and the temperature immediately before winding are important factors. It is important to control.
【０００３】ここで、熱間仕上圧延ラインでは、例えば
図２に示すように、パスラインに沿って仕上タンデム圧
延機１、ホットランテーブル、巻取り装置３の順に配列
される。Here, in the hot finishing rolling line, for example, as shown in FIG. 2, a finishing tandem rolling mill 1, a hot run table, and a winding device 3 are arranged in this order along a pass line.
【０００４】そして、熱延鋼板２の冷却（温度制御）
は、仕上圧延機１の各スタンド１ａ〜１ｇ間にそれぞれ
設置されている冷却装置４ａ〜４ｆ、及び仕上圧延後の
ホットランテーブル（図示せず）位置に設置されている
冷却設備７により行われている。[0004] Cooling of hot-rolled steel sheet 2 (temperature control)
Is performed by the cooling devices 4a to 4f installed between the stands 1a to 1g of the finishing mill 1 and the cooling equipment 7 installed at the hot run table (not shown) after the finish rolling. I have.
【０００５】上記仕上タンデム圧延機出側位置の温度制
御は、例えば、仕上タンデム圧延機入側に設置された温
度計５０による測定値又は予測値や搬送速度パターンの
情報を用いて、コントローラ５１が、バルブの開度調整
装置５２を介して各冷却装置４ａ〜４ｆのバルブの開度
を制御することにより、各冷却装置４ａ〜４ｆから鋼板
２に供給する冷却水量を増減させるフィードフォワード
制御や、仕上圧延機１出側に設置された温度計５４の測
定値に基づきフィードバック制御によって上記各冷却装
置４ａ〜４ｆから鋼板２に供給する冷却水量を調整する
ことで行われる。[0005] The controller 51 controls the temperature of the exit position of the finishing tandem rolling mill by using, for example, information measured or predicted by a thermometer 50 installed on the entrance side of the finishing tandem rolling mill or information on a conveying speed pattern. By controlling the valve opening of each of the cooling devices 4a to 4f via the valve opening adjusting device 52, feedforward control for increasing or decreasing the amount of cooling water supplied to the steel plate 2 from each of the cooling devices 4a to 4f, The cooling is performed by adjusting the amount of cooling water supplied to the steel plate 2 from each of the cooling devices 4a to 4f by feedback control based on the measurement value of the thermometer 54 installed on the exit side of the finishing mill 1.
【０００６】ここで、従来においては、上記スタンド１
ａ〜１ｇ間に配置される冷却装置４ａ〜４ｆは、隣接し
たスタンドが圧延に使用されている場合にのみ使用され
る。即ち、仕上圧延後についてはスタンド間において冷
却は実施されていない。Here, conventionally, the stand 1
The cooling devices 4a to 4f arranged between a to 1g are used only when the adjacent stand is used for rolling. That is, cooling after the finish rolling is not performed between the stands.
【０００７】また、巻取り直前の温度制御は、上記仕上
圧延機１出側に配置された温度計５４で測定した測定値
に基づき、コントローラ５１がバルブの開度調整装置５
３を介して、ホットランテーブル位置に設置されている
冷却設備７による冷却水量を調整するフィードフォワー
ド制御や、巻取り装置３前に設置された巻取り温度計５
５の測定に基づき、冷却水量を調整するフィードバック
制御により行われる。The temperature control immediately before winding is performed by the controller 51 by the controller 51 based on the measurement value measured by the thermometer 54 disposed on the exit side of the finishing mill 1.
3, feed-forward control for adjusting the amount of cooling water by the cooling equipment 7 installed at the hot run table position, and a winding thermometer 5 installed in front of the winding device 3.
Based on the measurement of No. 5, feedback control is performed to adjust the amount of cooling water.
【０００８】[0008]
【発明が解決しようとする課題】上記熱間仕上圧延ライ
ンでは、例えば、製品板厚が１５mm以上の極厚材と呼ば
れる鋼板２を製造する場合には、仕上圧延機１のスタン
ド１ａ〜１ｇのうち前段のスタンド、例えば第３スタン
ドまで１ａ〜１ｃが圧延に使用され、後段の第４スタン
ド以降１ｄ〜１ｇは圧延に使用されない。In the hot finish rolling line, for example, when manufacturing a steel plate 2 called an extremely thick material having a product plate thickness of 15 mm or more, the stands 1a to 1g of the finish rolling mill 1 are required. Of these, the first stand, for example, 1a to 1c up to the third stand, is used for rolling, and the fourth and subsequent stands, 1d to 1g, are not used for rolling.
【０００９】このような場合、上記従来のような仕上圧
延機１出側の温度計５４の測定値による温度制御では、
例えば、図３に示すように、圧延に使用されないスタン
ド１ｄ〜１ｇ間に配置された冷却装置４ｃ〜４ｆからは
冷却水が供給されないため、上記仕上前段スタンド（例
えば第３スタンド１ｃなど）から仕上圧延機１出側温度
計５４の設置位置に到達するまでの応答の遅れがある。In such a case, in the conventional temperature control based on the measured value of the thermometer 54 on the exit side of the finishing mill 1,
For example, as shown in FIG. 3, since cooling water is not supplied from the cooling devices 4c to 4f arranged between the stands 1d to 1g that are not used for rolling, finishing is performed from the finishing pre-stand (for example, the third stand 1c). There is a delay in response until the position of the output thermometer 54 of the rolling mill 1 is reached.
【００１０】すなわち、仕上圧延機１出側で温度を測定
して、仕上圧延中のスタンド１ａ〜１ｃ間の冷却装置４
ａ，４ｂによる冷却水の増減をフィードバック制御で調
整する場合、制御の無駄時間が大きい。このため、例え
ば、フィードバック制御を開始した時点で、第３スタン
ド１ｃ出側〜仕上圧延機１出側の温度計５４に位置した
鋼板２部分については制御が適用されず、精度を向上で
きないという問題がある。That is, the temperature is measured on the exit side of the finishing mill 1 and the cooling device 4 between the stands 1a to 1c during the finish rolling is performed.
When the increase and decrease of the cooling water due to a and 4b are adjusted by the feedback control, the dead time of the control is long. Therefore, for example, when feedback control is started, control is not applied to the steel plate 2 located on the thermometer 54 from the third stand 1c exit side to the finishing mill 1 exit side, and the accuracy cannot be improved. There is.
【００１１】また、従来の温度制御では、第３スタンド
１ｃで圧延され仕上圧延終了後の冷却は、ホットランテ
ーブル位置に鋼板２が到達したのちに、再び行われるた
め、第３スタンド１ｃ出側からホットランテーブル位置
に到達するまでは、空冷状態（非冷却状態）となるた
め、再結晶により組織が肥大化し、製品としての鋼板２
の強度が低下するという問題もある。In the conventional temperature control, since the steel sheet 2 is rolled at the third stand 1c and cooled after finishing rolling is completed again after the steel sheet 2 reaches the hot run table position, the cooling from the third stand 1c exit side. Until it reaches the hot run table position, it is in an air-cooled state (non-cooled state).
There is also a problem that the strength of the steel is reduced.
【００１２】本発明は、上記のような問題点に着目して
なされたもので、高精度な熱延鋼板の温度制御技術を提
供することを課題とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a highly accurate temperature control technique for a hot-rolled steel sheet.
【００１３】[0013]
【課題を解決するための手段】上記課題を解決するため
に、本発明のうち請求項１に記載した熱延鋼板の温度制
御装置は、鋼板が搬送されるパスラインに沿って仕上タ
ンデム圧延機、ホットランテーブル、及び巻取り装置が
配列され、上記圧延機の各スタンド間に冷却装置を配置
すると共に上記ホットランテーブル位置に冷却装置を配
置した制御装置であって、上記タンデム圧延機の各スタ
ンド間の少なくとも一か所に配置されて鋼板の温度を測
定する温度計と、上記温度計の測定値に基づき、当該温
度計の配置位置よりも搬送方向上流側の冷却装置から鋼
板に供給される冷却水量をフィードバック制御で調整す
ると共に、上記温度計の配置位置よりも搬送方向下流側
のスタンド間及びホットランテーブル位置の冷却装置の
うちの少なくもスタンド間の冷却装置から鋼板に供給す
る冷却水量をフィードフォワード制御で調整するコント
ローラと、を備えることを特徴とするものである。According to a first aspect of the present invention, there is provided a temperature control apparatus for a hot-rolled steel sheet, comprising a finishing tandem rolling mill along a pass line through which the steel sheet is conveyed. , A hot run table, and a winding device are arranged, a cooling device is disposed between the stands of the rolling mill, and a cooling device is disposed at the hot run table position, between the stands of the tandem rolling mill. A thermometer disposed at at least one location to measure the temperature of the steel sheet, and cooling supplied to the steel sheet from a cooling device on the upstream side in the transport direction from the position of the thermometer based on the measurement value of the thermometer. The amount of water is adjusted by feedback control, and at least one of the cooling devices between the stands on the downstream side in the transport direction from the position where the thermometer is arranged and the cooling device at the hot run table position is used. A controller for adjusting the amount of cooling water supplied from the cooling device to the steel plate between the command feedforward control and is characterized in that it comprises.
【００１４】次に、請求項２に記載した熱延鋼板の温度
制御方法は、熱延鋼板を製造する仕上タンデム圧延機の
複数のスタンド間の少なくとも１箇所で鋼板の温度を測
定し、その測定値に基づき、当該温度測定位置よりも搬
走方向上流側で鋼板に供給する冷却水量を調整するフィ
ードバック制御及び、上記温度測定位置よりも搬走方向
下流側のスタンド間及びホットランテーブル位置の冷却
装置のうち少なくともスタンド間の冷却装置から鋼板に
供給する冷却水量を調整するフィードフォワード制御の
うちのいずれか一方又は両方の制御を行うことを特徴と
するものである。Next, a temperature control method for a hot-rolled steel sheet according to a second aspect of the present invention measures the temperature of the steel sheet at at least one position between a plurality of stands of a finishing tandem rolling mill for manufacturing a hot-rolled steel sheet, and measures the temperature. Based on the value, feedback control for adjusting the amount of cooling water supplied to the steel sheet on the upstream side in the traveling direction from the temperature measurement position, and a cooling device between stands and the hot run table position on the downstream side in the traveling direction from the temperature measurement position And at least one of feed-forward control for adjusting the amount of cooling water supplied to the steel sheet from the cooling device between the stands is performed.
【００１５】本発明によれば、熱延鋼板を製造する仕上
タンデム圧延機のスタンド間において鋼板の温度を測定
し、その測定値に基づき、フィードバック制御により搬
走方向上流側で鋼板に供給する冷却水量を変化させるか
ら、圧延に使用されるスタンドが前段のスタンドだけで
あっても無駄時間の小さい制御を行うことができて、仕
上圧延直後の鋼板温度の制御精度を高めることができ
る。According to the present invention, the temperature of a steel sheet is measured between stands of a finishing tandem rolling mill for producing a hot-rolled steel sheet, and cooling supplied to the steel sheet on the upstream side in the traveling direction by feedback control based on the measured value. Since the amount of water is changed, even when the stand used for rolling is only the preceding stand, control with a small dead time can be performed, and the accuracy of controlling the temperature of the steel sheet immediately after finish rolling can be increased.
【００１６】また、上記温度計の測定値に基づき、フィ
ードフォワード制御により搬送方向下流側で鋼板に供給
する冷却水量を変化させるから、圧延に使用されるスタ
ンドが前段のスタンドだけであっても、ホットランテー
ブルまで搬送される間も水冷が行われることで、非水冷
領域を小さくして鋼板の再結晶粒肥大化を防止し、鋼板
に製品として要求される所定の強度を確保できるように
なる。Further, since the amount of cooling water supplied to the steel sheet on the downstream side in the transport direction is changed by feedforward control based on the measured value of the thermometer, even if the stand used for rolling is only the preceding stand, Since the water cooling is performed during the transportation to the hot run table, the non-water-cooled area is reduced to prevent the steel sheet from becoming recrystallized and grain enlarged, and the steel sheet can have a predetermined strength required as a product.
【００１７】[0017]
【発明の実施の形態】次に、本発明の実施形態を図面を
参照しつつ説明する。本実施形態の熱間仕上圧延ライン
の基本構成は、従来とほぼ同じであり、図１に示すよう
に、鋼板２を搬送するパスラインに沿って仕上タンデム
圧延機１、ホットランテーブル、及び巻き取り装置３の
順に配列している。Next, embodiments of the present invention will be described with reference to the drawings. The basic configuration of the hot finish rolling line of the present embodiment is almost the same as the conventional one, and as shown in FIG. 1, a finishing tandem rolling mill 1, a hot run table, and a winding machine are arranged along a pass line for conveying a steel sheet 2. The devices 3 are arranged in this order.
【００１８】上記仕上タンデム圧延機１は、複数のスタ
ンド１ａ〜１ｇ（図１では７段を例示している）が並列
している仕上圧延設備であり、その各スタンド１ａ〜１
ｇ間には、それぞれ冷却装置を構成する冷却水用のヘッ
ダ４ａ〜４ｆが配置され、各ヘッダ４ａ〜４ｆに設けら
れたノズルから鋼板２に向けて冷却水を供給可能となっ
ている。The finishing tandem rolling mill 1 is a finishing rolling facility in which a plurality of stands 1a to 1g (seven stages are illustrated in FIG. 1) are arranged in parallel.
Between g, cooling water headers 4a to 4f constituting the cooling devices are arranged, and cooling water can be supplied toward the steel plate 2 from nozzles provided in the headers 4a to 4f.
【００１９】各ヘッダ４ａ〜４ｆは、不図示のバルブを
開度調整することにより供給される冷却水量が変更さ
れ、そのバルブの開度調整は開度調整装置５，６からの
信号に基づきそれぞれ行われるようになっている。The amount of cooling water supplied to each of the headers 4a to 4f is changed by adjusting the opening of a valve (not shown), and the opening of the valve is adjusted based on signals from the opening adjusting devices 5 and 6, respectively. Is being done.
【００２０】さらに、圧延機１出側のホットランテーブ
ル位置にも、冷却装置７が配置され、冷却水量の変更が
開度調整装置６からの信号に基づき行われるようになっ
ている。Further, a cooling device 7 is arranged also at the hot run table position on the exit side of the rolling mill 1, and the amount of cooling water is changed based on a signal from the opening adjustment device 6.
【００２１】また、上記圧延機１における第４スタンド
１ｄと第５スタンド１ｅとの間には、温度計８が配置さ
れている。温度計８は、鋼板２の温度を測定し、測定信
号をコントローラ９に供給している。A thermometer 8 is arranged between the fourth stand 1d and the fifth stand 1e in the rolling mill 1. The thermometer 8 measures the temperature of the steel plate 2 and supplies a measurement signal to the controller 9.
【００２２】そのコントローラ９には、製品の品質等に
応じた仕上タンデム圧延機出側の目標温度及び巻取り時
の目標温度が予め供給されている。そのコントローラ９
は、上記仕上タンデム圧延機出側の目標温度となるよう
に、上記温度計８による測定値に基づき当該温度計８よ
りも上流側の冷却水用のヘッダ４ａ，４ｂから供給され
る冷却水量を開度調整装置５を介してフィードバック制
御で調整する。同時に、上記巻取り時の目標温度となる
ように、上記温度計８による測定値に基づき当該温度計
８よりも下流側のスタンド１ｅ〜１ｇ間の冷却水用のヘ
ッダ４ｅ，４ｆから供給される冷却水量及びホットラン
テーブル位置の冷却装置７から供給される冷却水量を開
度調整装置６を介してフィードフォワード制御にて調整
する。The controller 9 is supplied in advance with a target temperature on the exit side of the finishing tandem rolling mill and a target temperature for winding in accordance with the quality of the product and the like. The controller 9
The cooling water amount supplied from the cooling water headers 4a and 4b upstream of the thermometer 8 based on the measurement value of the thermometer 8 so that the target temperature on the exit side of the finishing tandem rolling mill is obtained. The adjustment is performed by feedback control via the opening adjustment device 5. At the same time, the cooling water is supplied from the headers 4e and 4f for the cooling water between the stands 1e to 1g on the downstream side of the thermometer 8 based on the measurement value of the thermometer 8 so that the target temperature at the time of the winding is attained. The amount of cooling water and the amount of cooling water supplied from the cooling device 7 at the position of the hot run table are adjusted by feedforward control via the opening degree adjusting device 6.
【００２３】上記構成の温度制御装置を備えた仕上ライ
ンにおいては、例えば、板厚１５mm等の極厚の鋼板２を
製造する場合には、タンデム圧延機１のうちの前段の３
台のスタンド１ａ〜１ｃでのみ圧延が実施されて、第３
スタンド１ｃの出側が実質の仕上圧延の出側になる。In the finishing line equipped with the temperature control device having the above-described configuration, for example, when manufacturing an extremely thick steel plate 2 having a thickness of 15 mm, etc.
Rolling is performed only on the three stands 1a to 1c,
The exit side of the stand 1c is the actual exit side of finish rolling.
【００２４】このとき、本実施形態では、第４スタンド
１ｄと第５スタンド１ｅとの間において、鋼板２の温度
を測定するために、従来に比べて早期に仕上圧延出側の
温度が測定でき、その温度に基づき上流側の冷却用ヘッ
ダ４ａ，４ｂからの冷却水量の調整ができるため、従来
よりも時間遅れが小さく制御の応答性が向上する。At this time, in this embodiment, since the temperature of the steel plate 2 is measured between the fourth stand 1d and the fifth stand 1e, the temperature of the finish rolling side can be measured earlier than before. Since the amount of cooling water from the cooling headers 4a and 4b on the upstream side can be adjusted based on the temperature, the time delay is smaller than in the conventional case, and the control response is improved.
【００２５】さらに、圧延に使用されていないスタンド
１ｄ〜１ｇの間に配置された冷却水ヘッダ４ａ〜４ｆか
らもフィードフォワード制御で冷却水を供給するように
したので、実際の仕上圧延終了からホットランテーブル
位置での冷却装置７による水冷開始までの空冷保持時間
が１スタンド分を通過するに要する短い時間となり、鋼
板２の圧延によって比較的小さくなった結晶粒の状態が
保持され、製品となったコイルに十分な強度が確保され
る。Further, since the cooling water is supplied by the feedforward control from the cooling water headers 4a to 4f disposed between the stands 1d to 1g which are not used for rolling, the hot run is performed after the end of the actual finish rolling. The air cooling holding time until the start of water cooling by the cooling device 7 at the table position was a short time required to pass through one stand, and the state of crystal grains which were relatively small due to the rolling of the steel plate 2 was maintained, and the product was obtained. Sufficient strength is ensured for the coil.
【００２６】ここで、上記実施形態の説明では、圧延機
１のうち前段の３スタンド１ａ〜１ｃまでで圧延が実施
される場合で説明しているが、前段の２スタンド１ａ，
１ｂまで、又は４スタンド１ａ〜１ｄまで使用して圧延
が実施される場合であっても、上記の温度制御によって
制御の応答性は従来よりも向上する。また、空冷保持域
が小さいので製品となったコイルに十分な強度が確保さ
れる。Here, in the description of the above embodiment, the case where the rolling is carried out in the three stands 1a to 1c of the former stage in the rolling mill 1 has been described.
Even when rolling is performed using up to 1b or up to four stands 1a to 1d, the above-described temperature control improves control responsiveness as compared with the conventional case. Further, since the air-cooling holding area is small, sufficient strength is ensured for the product coil.
【００２７】また、上記実施形態では、スタンド１ａ〜
１ｇ間の温度計８による測定値に基づき、ホットランテ
ーブル位置の冷却装置７による水冷のフィードバック制
御も行っているが、ホットランテーブル位置の温度制御
は、従来のように、ホットランテーブル入側やダウンコ
イラー前に設置された温度計２１，２２による測定値に
基づきフィードバック制御やフィードフォワード制御に
より行ってもよい。In the above embodiment, the stands 1a to 1a
Based on the value measured by the thermometer 8 for 1 g, feedback control of water cooling by the cooling device 7 at the position of the hot run table is also performed. It may be performed by feedback control or feedforward control based on the measurement values of the thermometers 21 and 22 installed before.
【００２８】また、上記実施形態では、スタンド１ｄ〜
１ｅ間に配置した温度計８で上流側についてはフィード
バック制御を行い、下流側にはフィードフォワード制御
を実施しているが、上記温度計８より上流側について、
仕上タンデム圧延機入側の温度を測定しその測定値に基
づいたフィードフォワード制御を併用したり、上記温度
計８より下流の冷却について、ホットラン出側の温度を
測定しその測定値に基づいたフィードバック制御を併用
して、さらに温度制御の精度を向上させるようにしても
よい。In the above embodiment, the stands 1d to
The feedback control is performed on the upstream side by the thermometer 8 disposed between 1e and the feedforward control is performed on the downstream side.
The temperature on the entrance side of the finishing tandem rolling mill is measured, and feedforward control based on the measured value is used together. For cooling downstream from the thermometer 8, the temperature on the outlet side of the hot run is measured, and feedback based on the measured value is performed. The control may be used in combination to further improve the accuracy of the temperature control.
【００２９】また、上記温度計８の測定値に基づき当該
温度計８より下流側で供給する冷却水量のフィードフォ
ワード制御のみを行い、温度計８よりも上流側のヘッダ
４ａ〜４ｂを介した冷却水量の調整については、仕上タ
ンデム圧延機入側の温度を別の温度計２３で測定しその
測定値に基づきフィードフォワード制御で調整するよう
にしてもよい。Further, based on the measured value of the thermometer 8, only feed-forward control of the amount of cooling water supplied downstream of the thermometer 8 is performed, and cooling via the headers 4a-4b upstream of the thermometer 8 is performed. As for the adjustment of the water amount, the temperature on the entrance side of the finishing tandem rolling mill may be measured by another thermometer 23, and the temperature may be adjusted by feedforward control based on the measured value.
【００３０】また、従来と同様に、仕上タンデム圧延機
１出側の温度計２１による測定値を上記コントローラ９
に供給して、上記スタンド１ｄ〜１ｅ間に配置した温度
計８による測定値に基づいては、当該温度計８より上流
のヘッダ４ａ，４ｂにより供給される冷却水量のフィー
ドバックによる調整のみを行い、その温度計８より下流
のヘッダ４ｅ，４ｆから供給される冷却水量を、出側温
度計２１による測定値に基づきフォードバック制御する
と共に、当該出側温度計による測定値に基づき冷却装置
７から供給される冷却水量の調整をフィードフォワード
制御するようにしてもよい。In the same manner as in the prior art, the value measured by the thermometer 21 on the exit side of the finishing tandem mill 1 is transferred to the controller 9.
And based on the measurement values of the thermometer 8 disposed between the stands 1d to 1e, only the feedback adjustment of the amount of cooling water supplied by the headers 4a and 4b upstream of the thermometer 8 is performed. The amount of cooling water supplied from the headers 4e and 4f downstream of the thermometer 8 is feedback-controlled based on the value measured by the outlet thermometer 21 and supplied from the cooling device 7 based on the value measured by the outlet thermometer. The adjustment of the cooling water amount to be performed may be performed by feedforward control.
【００３１】また、上記実施形態では、第４スタンド１
ｄと第５スタンド１ｅとの間にのみ温度計８を配置した
例を説明しているが、複数のスタンド１ａ〜１ｇ間の個
々に温度計を配置して、圧延に使用されるスタンド数に
よって上記制御に使用する温度計を変更するようにして
もよい。In the above embodiment, the fourth stand 1
Although the example in which the thermometer 8 is arranged only between the d and the fifth stand 1e is described, the thermometer is individually arranged between the plurality of stands 1a to 1g, and depending on the number of stands used for rolling. The thermometer used for the control may be changed.
【００３２】[0032]
【実施例】実際に７スタンド１ａ〜１ｇある仕上タンデ
ム圧延機１において、板厚１５ｍｍの製品を前段の第１
〜第３スタンド１ａ〜１ｃを使用して製造する場合につ
いて、本願発明に基づく温度制御を実施した例を説明す
る。EXAMPLE In a finishing tandem rolling mill 1 having 7 stands 1a to 1g, a product having a thickness of 15 mm
An example in which temperature control based on the present invention is performed in the case of manufacturing using the third to third stands 1a to 1c will be described.
【００３３】ここで、この製品に要求される強度は５５
±５kgf ／mm2 であり、このときの仕上出側温度は８５
０±４０℃、巻取り温度目標は６００±４０℃を目標と
して温度制御した。Here, the strength required for this product is 55
± 5 kgf / mm 2 , and the finish output side temperature at this time is 85
The temperature was controlled to 0 ± 40 ° C. and the winding temperature target to 600 ± 40 ° C.
【００３４】従来例として、図３に示す構成で、仕上出
側温度計５４にて測定した値から、コントローラ５２に
てスタンド１ａ，１ｂ間、及び１ｂ，１ｃ間での供給水
量の修正量を計算し、開度調整御装置５２を介してバル
ブ操作を行うことにより、フィードバック制御を行い、
ホットランテーブル位置の冷却においても同様に、コン
トローラ５１により冷却水供給の修正量を計算し、開度
調整装置５３を介してバルブ操作を行うことにより、フ
ィードフォワード制御を行う温度制御方法を比較のため
に実施した。As a conventional example, in the configuration shown in FIG. 3, the controller 52 calculates the amount of correction of the amount of supplied water between the stands 1a and 1b and between the stands 1b and 1c from the value measured by the finishing thermometer 54. Calculate and perform the valve control via the opening adjustment device 52 to perform feedback control,
Similarly, in the cooling of the hot run table position, the controller 51 calculates the correction amount of the cooling water supply and performs a valve operation via the opening degree adjusting device 53 to perform a temperature control method of performing feedforward control for comparison. It was carried out.
【００３５】この従来の温度制御を実施した場合には、
図４に示すように、鋼板２の先端部で目標よりも高い仕
上出側温度を検出して冷却装置４ａ，４ｂの供給量を増
やしても、供給量の増加は、すでに第３スタンド１ｃ以
降にある鋼板部分に対しては反映されず、仕上出側温度
は最高で９００℃まで上昇した。また、第３スタンド１
ｃで圧延した後、ホットランテーブル位置の冷却設備７
に達するまでの７秒の間、鋼板２には冷却水が供給され
ず高温で保持されたため、結晶粒が大きくなって十分な
強度が得られにくかった。この結果、得られた製品の強
度は図６のようになり、目標強度の５５±５kgf ／mm2
が得られなかった。When the conventional temperature control is performed,
As shown in FIG. 4, even if the finishing side temperature higher than the target is detected at the tip end of the steel plate 2 and the supply amount of the cooling devices 4 a and 4 b is increased, the increase of the supply amount has already occurred after the third stand 1 c. Was not reflected on the steel plate portion in the above, and the finish-side temperature rose to 900 ° C. at the maximum. Also, the third stand 1
After rolling at c, the cooling equipment 7 at the hot run table position
During a period of 7 seconds until the steel sheet 2 was reached, cooling water was not supplied to the steel sheet 2 and the steel sheet 2 was kept at a high temperature. As a result, the strength of the obtained product is as shown in FIG. 6, and the target strength is 55 ± 5 kgf / mm 2.
Was not obtained.
【００３６】これに対し、本発明に基づく上記実施形態
の温度制御を実施した場合には、第５スタンド１ｅ以降
での冷却がフィードフォワード制御で実施され、図５に
示すように、鋼板２の先端部で目標よりも高い仕上出側
温度を検出すると、直ちに、つまり無駄時間が小さい状
態で冷却装置４ａ，４ｂによる供給水量を増やすように
調整され、供給量の増加が反映されなかった部分はわず
かであるため、温度計８の指示の最高でも８６５℃とな
った。また、第１〜第３スタンド１ａ〜１ｇで圧延し、
第４〜５スタンド間で温度測定をした後に第５〜６スタ
ンド間、６〜７スタンド間の冷却装置７およびホットラ
ン冷却設備において水冷を行ったので、仕上圧延終了か
ら水冷開始までの空冷保持時間は２秒で済んだ。このた
め、圧延によって比較的小さくなった結晶粒が保持され
十分な強度が得られた。On the other hand, when the temperature control of the above embodiment according to the present invention is performed, the cooling after the fifth stand 1e is performed by feedforward control, and as shown in FIG. As soon as the finishing side temperature higher than the target is detected at the tip, the amount of water supplied by the cooling devices 4a and 4b is adjusted to increase while the dead time is short, and the portion where the increase in the amount of supply is not reflected is Because of the slight amount, the maximum value indicated by the thermometer 8 was 865 ° C. In addition, rolling at the first to third stands 1a to 1g,
After the temperature was measured between the 4th and 5th stands, water cooling was performed between the 5th and 6th stands and between the 6th and 7th stands in the cooling device 7 and the hot run cooling equipment. Took two seconds. For this reason, the crystal grains relatively small by the rolling were retained, and sufficient strength was obtained.
【００３７】即ち、製品の強度は図７に示すようにな
り、コイル全長にわたって目標強度５５±５kgf ／mm2
以内の引張強度が得られた。以上のように、本発明によ
り仕上圧延終了時の温度を高い精度で制御するととも
に、仕上圧延終了後直ちに水冷を行うことができたの
で、板厚が比較的厚くある程度高い強度を要する製品の
強度のばらつきが著しく改善した。板厚が１５mm以上の
製品の歩留まりは、従来は８８％程度であったが、本発
明により１００％近くに改善された。That is, the strength of the product is as shown in FIG. 7, and the target strength is 55 ± 5 kgf / mm 2 over the entire length of the coil.
A tensile strength of less than or equal to was obtained. As described above, according to the present invention, the temperature at the end of finish rolling is controlled with high accuracy, and water cooling can be performed immediately after the end of finish rolling. Significantly improved. The yield of products having a thickness of 15 mm or more was conventionally about 88%, but has been improved to nearly 100% by the present invention.
【００３８】[0038]
【発明の効果】本発明により、熱延鋼板を製造する仕上
タンデム圧延機のスタンド間において鋼板の温度を測定
し、その測定値に基づき演算を行い、フィードバック制
御によって搬走方向上流側で鋼板に供給する冷却水量を
変化させるから、極厚板を製造する場合であっても、無
駄時間の小さい制御を行うことができて、仕上圧延直後
の鋼板温度の制御精度を高めることができる。According to the present invention, the temperature of a steel sheet is measured between stands of a finishing tandem rolling mill for producing a hot-rolled steel sheet, an operation is performed based on the measured value, and feedback control is applied to the steel sheet on the upstream side in the carrying direction. Since the amount of cooling water to be supplied is changed, even when an extremely thick plate is manufactured, control with a small dead time can be performed, and the accuracy of controlling the temperature of the steel sheet immediately after finish rolling can be improved.
【００３９】また、上記スタンド間に配した温度計の測
定値にもとづいて演算を行い、フィードフォワード制御
により搬送方向下流側で鋼板に供給する冷却水量を変化
させるから、使用されるスタンドが前段だけの場合で
も、仕上げ圧延終了後にすみやかに水冷が実施されて、
再結晶粒肥大化を防止し、製品として要求される強度を
確保できる。Further, since the calculation is performed based on the measured value of the thermometer disposed between the above-mentioned stands and the amount of cooling water supplied to the steel sheet on the downstream side in the transport direction is changed by the feedforward control, only the front stand is used. Even in the case of, water cooling is immediately performed after finishing rolling,
This prevents recrystallization grain enlargement and ensures the strength required as a product.
【図面の簡単な説明】[Brief description of the drawings]
【図１】本発明の実施の形態に係る温度制御を説明する
ための概念図である。FIG. 1 is a conceptual diagram for explaining temperature control according to an embodiment of the present invention.
【図２】従来の温度制御を説明するための概念図であ
る。FIG. 2 is a conceptual diagram for explaining conventional temperature control.
【図３】従来の温度制御を説明するための概念図であ
る。FIG. 3 is a conceptual diagram for explaining conventional temperature control.
【図４】コイル長手方向での従来の温度制御例を説明す
る図である。FIG. 4 is a diagram illustrating an example of conventional temperature control in a coil longitudinal direction.
【図５】コイル長手方向での本願発明に基づく温度制御
例を説明する図である。FIG. 5 is a diagram for explaining an example of temperature control based on the present invention in the coil longitudinal direction.
【図６】従来の温度制御を実施した場合のコイル長手方
向の製品強度分布例を示す図である。FIG. 6 is a diagram illustrating an example of a product strength distribution in a coil longitudinal direction when a conventional temperature control is performed.
【図７】本願発明に基づく温度制御を実施した場合のコ
イル長手方向の製品強度分布例を示す図である。FIG. 7 is a diagram showing an example of product strength distribution in a coil longitudinal direction when temperature control according to the present invention is performed.
１ タンデム圧延機 １ａ〜１ｇ スタンド ２ 鋼板 ３ 巻取り装置 ４ａ〜４ｆ 冷却装置 ５，６ 開度調整装置 ７ 冷却装置 ８ 温度計 ９ コントローラ DESCRIPTION OF SYMBOLS 1 Tandem rolling mill 1a-1g Stand 2 Steel plate 3 Winding device 4a-4f Cooling device 5,6 Openness adjusting device 7 Cooling device 8 Thermometer 9 Controller
Claims (2)
上タンデム圧延機、ホットランテーブル、及び巻取り装
置が配列され、上記圧延機の各スタンド間に冷却装置を
配置すると共に上記ホットランテーブル位置に冷却装置
を配置した制御装置であって、 上記タンデム圧延機の各スタンド間の少なくとも一か所
に配置されて鋼板の温度を測定する温度計と、 上記温度計の測定値に基づき、当該温度計の配置位置よ
りも搬送方向上流側の冷却装置から鋼板に供給される冷
却水量をフィードバック制御で調整すると共に、上記温
度計の配置位置よりも搬送方向下流側のスタンド間及び
ホットランテーブル位置の冷却装置のうちの少なくもス
タンド間の冷却装置から鋼板に供給する冷却水量をフィ
ードフォワード制御で調整するコントローラと、 を備えることを特徴とする熱延鋼板の温度制御装置。1. A finishing tandem rolling mill, a hot run table, and a winding device are arranged along a pass line through which a steel sheet is conveyed. A cooling device is arranged between stands of the rolling mill, and a cooling device is disposed between the stands of the hot run table. A control device provided with a cooling device, wherein the thermometer is disposed at at least one location between the stands of the tandem rolling mill and measures the temperature of the steel sheet. Based on a measurement value of the thermometer, the thermometer is used. The amount of cooling water supplied to the steel sheet from the cooling device on the upstream side in the transport direction from the arrangement position is adjusted by feedback control, and the cooling device between the stands and the hot run table position on the downstream side in the transport direction from the arrangement position of the thermometer. A controller that adjusts the amount of cooling water supplied to the steel sheet from at least the cooling device between the stands by feedforward control, and A temperature control device for a hot-rolled steel sheet, comprising:
の複数のスタンド間の少なくとも１箇所で鋼板の温度を
測定し、その測定値に基づき、当該温度測定位置よりも
搬走方向上流側で鋼板に供給する冷却水量を調整するフ
ィードバック制御及び、上記温度測定位置よりも搬走方
向下流側のスタンド間及びホットランテーブル位置の冷
却装置のうち少なくともスタンド間の冷却装置から鋼板
に供給する冷却水量を調整するフィードフォワード制御
のうちのいずれか一方又は両方の制御を行うことを特徴
とする熱延鋼板の温度制御方法。2. The temperature of a steel sheet is measured at at least one point between a plurality of stands of a finishing tandem rolling mill for producing a hot-rolled steel sheet, and based on the measured value, the temperature of the steel sheet is determined on the upstream side of the temperature measurement position in the transport direction. Feedback control for adjusting the amount of cooling water to be supplied to the steel sheet, and the amount of cooling water to be supplied to the steel sheet from at least the cooling device between the stands between the stands and the hot run table position between the stands on the downstream side in the traveling direction from the temperature measurement position. A method of controlling the temperature of a hot-rolled steel sheet, wherein one or both of the feedforward controls to be adjusted are controlled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10076067A JPH11267730A (en) | 1998-03-24 | 1998-03-24 | Device for controlling temperature of hot rolled sheet and its method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10076067A JPH11267730A (en) | 1998-03-24 | 1998-03-24 | Device for controlling temperature of hot rolled sheet and its method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11267730A true JPH11267730A (en) | 1999-10-05 |
Family
ID=13594443
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10076067A Pending JPH11267730A (en) | 1998-03-24 | 1998-03-24 | Device for controlling temperature of hot rolled sheet and its method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11267730A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6526804B2 (en) | 2000-05-30 | 2003-03-04 | Fuji Jukogyo Kabushiki Kaisha | Road friction coefficient estimating apparatus for vehicle |
| KR100832974B1 (en) * | 2001-12-26 | 2008-05-27 | 주식회사 포스코 | In-line feed backward cooling control method of hot strip |
| WO2011025139A3 (en) * | 2009-08-27 | 2011-04-21 | 현대제철 주식회사 | Temperature control device for a rolling finishing mill and a method for the same |
| WO2011052871A1 (en) * | 2009-10-29 | 2011-05-05 | 현대제철 주식회사 | Thermometer, thermometer for finishing mill, temperature measuring method provided with same, and control method of finishing mill |
| EP2752254A4 (en) * | 2011-08-30 | 2015-07-29 | Toshiba Mitsubishi Elec Inc | Energy-saving device for rolling plant |
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-
1998
- 1998-03-24 JP JP10076067A patent/JPH11267730A/en active Pending
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| CN104998916A (en) * | 2011-08-30 | 2015-10-28 | 东芝三菱电机产业***株式会社 | Energy-saving device of rolling device |
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| JP2016530099A (en) * | 2013-07-03 | 2016-09-29 | ティッセンクルップ スチール ヨーロッパ アーゲーＴｈｙｓｓｅｎｋｒｕｐｐ Ｓｔｅｅｌ Ｅｕｒｏｐｅ Ａｇ | Equipment and method for hot rolling strip steel |
| KR20160030218A (en) * | 2013-07-03 | 2016-03-16 | 티센크루프 스틸 유럽 악티엔게젤샤프트 | Plant and method for hot rolling steel strip |
| US10335840B2 (en) | 2013-07-03 | 2019-07-02 | Thyssenkrupp Steel Europe Ag | Production lines and methods for hot rolling steel strip |
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| WO2020179019A1 (en) * | 2019-03-06 | 2020-09-10 | 東芝三菱電機産業システム株式会社 | Apparatus for controlling injection of cooling water for rolling mill, and method for controlling injection of cooling water |
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