JP2020157327A - Control method for outlet side temperature of finished steel sheet, control device therefor and production method for steel sheet - Google Patents

Control method for outlet side temperature of finished steel sheet, control device therefor and production method for steel sheet Download PDF

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JP2020157327A
JP2020157327A JP2019057692A JP2019057692A JP2020157327A JP 2020157327 A JP2020157327 A JP 2020157327A JP 2019057692 A JP2019057692 A JP 2019057692A JP 2019057692 A JP2019057692 A JP 2019057692A JP 2020157327 A JP2020157327 A JP 2020157327A
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steel sheet
rolling
temperature
finishing
specifications
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JP7135962B2 (en
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祐輝 吉岡
Yuki Yoshioka
祐輝 吉岡
今井 誠
Makoto Imai
誠 今井
圭佑 木村
Keisuke Kimura
圭佑 木村
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JFE Steel Corp
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Abstract

To provide a method and device capable of controlling at high accuracy, a finishing outlet side temperature of a steel sheet to a target temperature without needing a complicated adjustment.SOLUTION: A control method for a finishing outlet side temperature of a steel sheet comprises controlling the temperature of the steel sheet at an outlet side of a continuous rolling facility which rolls the steel sheet continuously using plural rolling machines arranged in a steel sheet rolling direction. The method includes calculating a temperature estimation value about the sheet of a rolling object by inputting the rolling dimensions of a rolling-objective sheet to a finishing outlet side temperature estimation model, generated from the rolling dimension and the actual value of temperature of the sheet rolled in the past and having the rolling dimensions of the sheet as an input variable and a temperature estimation value as an output variable, and a step of controlling the discharge patterns of plural cooling facilities provided between the rolling machines and discharging the cooling water to the sheet. In the rolling dimensions, information directly or indirectly relative to at least the temperature of the cooling water is included.SELECTED DRAWING: Figure 4

Description

本発明は、鋼板の仕上出側温度制御方法、鋼板の仕上出側温度制御装置、及び鋼板の製造方法に関する。 The present invention relates to a temperature control method for the finished side of a steel sheet, a temperature control device for the finished side of a steel sheet, and a method for manufacturing a steel sheet.

一般に、鋼板の圧延方向に配列された複数の圧延機を利用して鋼板を連続的に圧延する連続圧延設備では、圧延機間に設けられ、鋼板に冷却水を吐出する複数の冷却設備の吐出パターン(オン/オフパターン)を制御することにより、連続圧延設備の出側における鋼板の温度(仕上出側温度)を目標温度に制御している。このような背景から、特許文献1には、鋼板の諸元や圧延速度等から鋼板の温度降下量を算出して複数の冷却設備の最適な吐出パターンを選択する技術が提案されている。 Generally, in a continuous rolling facility that continuously rolls a steel sheet using a plurality of rolling mills arranged in the rolling direction of the steel sheet, a plurality of cooling facilities are provided between the rolling mills and discharge cooling water to the steel sheet. By controlling the pattern (on / off pattern), the temperature of the steel sheet on the exit side of the continuous rolling equipment (finishing output side temperature) is controlled to the target temperature. Against this background, Patent Document 1 proposes a technique of calculating the amount of temperature drop of a steel sheet from the specifications of the steel sheet, the rolling speed, and the like, and selecting the optimum discharge pattern of a plurality of cooling facilities.

特開平7−164033号公報Japanese Unexamined Patent Publication No. 7-164033

しかしながら、特許文献1に記載の技術は、吐出パターンを選択する際、連続圧延設備の操業環境の変化や鋼板の成分を考慮していない。このため、特許文献1に記載の技術によれば、連続圧延設備の操業環境の変化や鋼板の成分によっては、最適な吐出パターンを選択できず、結果として、仕上出側温度を精度よく目標温度に制御できない可能性がある。特許文献1に記載の技術では、温度降下量の計算値を実績値に近づけるためには、鋼種や板幅等の区分毎に温度降下量の計算値に補正をかける等して複雑な調整を行う必要がある。また、温度降下量の計算精度が低いために仕上出側温度が目標温度より高めに外れた場合、スケールが増加する原因となり、歩留まりが低下する。一方、温度降下量の計算精度が低いために仕上出側温度が目標温度より低めに外れた場合には、鋼板の先端部の硬化に伴う噛み込み不良が発生し、設備故障を引き起こすリスクがある。 However, the technique described in Patent Document 1 does not take into consideration changes in the operating environment of the continuous rolling equipment and the components of the steel sheet when selecting the discharge pattern. Therefore, according to the technique described in Patent Document 1, the optimum discharge pattern cannot be selected depending on the change in the operating environment of the continuous rolling equipment and the composition of the steel sheet, and as a result, the finish side temperature can be accurately set to the target temperature. May be out of control. In the technique described in Patent Document 1, in order to bring the calculated value of the temperature drop closer to the actual value, complicated adjustment is made by correcting the calculated value of the temperature drop for each classification such as steel type and plate width. There is a need to do. In addition, if the finish side temperature deviates higher than the target temperature due to the low calculation accuracy of the temperature drop amount, the scale increases and the yield decreases. On the other hand, if the temperature on the finish side deviates below the target temperature due to the low calculation accuracy of the temperature drop, there is a risk that biting failure will occur due to hardening of the tip of the steel sheet, causing equipment failure. ..

本発明は、上記課題に鑑みてなされたものであって、その目的は、複雑な調整を必要とすることなく、鋼板の仕上出側温度を精度よく目標温度に制御可能な鋼板の仕上出側温度制御方法及び仕上出側温度制御装置を提供することにある。また、本発明の他の目的は、設備故障の発生を抑制しつつ、鋼板を歩留まりよく製造可能な鋼板の製造方法を提供することにある。 The present invention has been made in view of the above problems, and an object of the present invention is to control the finishing side temperature of a steel sheet to a target temperature accurately without requiring complicated adjustment. It is an object of the present invention to provide a temperature control method and a finish side temperature control device. Another object of the present invention is to provide a method for producing a steel sheet capable of producing a steel sheet with a high yield while suppressing the occurrence of equipment failure.

本発明の発明者らは、鋭意検討した結果、季節によって温度降下量の計算精度に影響が生じていることを知見した。これは、圧延時期の変化によって水温や気温が変化するために、鋼板の冷却量の変動量を正確に見積もれていないためと考えられる。そこで、仕上出側温度予測モデルに与える入力変数に冷却水の温度に直接若しくは間接的に関連する情報を含めることで、温度の予測値の高精度化を達成し、本発明を想到するに至った。また、本発明の発明者らは、さらに検討を進めた結果、従来考慮されていなかった鋼板の成分による加工発熱量が温度降下量の計算精度に影響を与えていることを知見した。そこで、上記入力変数に鋼板の成分に関する情報を含めることを想到した。 As a result of diligent studies, the inventors of the present invention have found that the calculation accuracy of the amount of temperature drop is affected by the season. It is considered that this is because the fluctuation amount of the cooling amount of the steel sheet is not accurately estimated because the water temperature and the air temperature change due to the change of the rolling time. Therefore, by including the information directly or indirectly related to the temperature of the cooling water in the input variable given to the finish side temperature prediction model, the prediction value of the temperature is highly accurate, and the present invention is conceived. It was. In addition, as a result of further studies, the inventors of the present invention have found that the amount of heat generated by processing due to the components of the steel sheet, which has not been considered in the past, affects the calculation accuracy of the amount of temperature drop. Therefore, I came up with the idea of including information about the composition of the steel sheet in the above input variables.

本発明に係る鋼板の仕上出側温度制御方法は、鋼板の圧延方向に配列された複数の圧延機を利用して鋼板を連続的に圧延する連続圧延設備の出側における鋼板の温度を制御する鋼板の仕上出側温度制御方法であって、過去に圧延された鋼板の圧延諸元と前記温度の実績値とから生成された、鋼板の圧延諸元を入力変数、前記温度の予測値を出力変数とする仕上出側温度予測モデルに対して、圧延対象の鋼板の圧延諸元を入力することによって、圧延対象の鋼板について前記温度の予測値を算出し、前記圧延機間に設けられ、前記鋼板に冷却水を吐出する複数の冷却設備の吐出パターンを前記予測値に基づいて制御するステップを含み、前記圧延諸元には、少なくとも冷却水の温度に直接若しくは間接的に関連する情報が含まれていることを特徴とする。 The finishing-out side temperature control method for a steel plate according to the present invention controls the temperature of the steel plate on the exit side of a continuous rolling facility that continuously rolls the steel plate by using a plurality of rolling mills arranged in the rolling direction of the steel plate. A method for controlling the temperature on the finishing side of a steel plate, in which the rolling specifications of the steel plate generated from the rolling specifications of the steel plate rolled in the past and the actual value of the temperature are input variables, and the predicted value of the temperature is output. By inputting the rolling specifications of the steel sheet to be rolled into the finish-side temperature prediction model as a variable, the predicted value of the temperature of the steel sheet to be rolled is calculated, and it is provided between the rolling mills. The rolling specifications include at least information directly or indirectly related to the temperature of the cooling water, which includes a step of controlling the discharge patterns of a plurality of cooling facilities for discharging cooling water to the steel plate based on the predicted values. It is characterized by being rolled.

本発明に係る鋼板の仕上出側温度制御方法は、上記発明において、前記圧延諸元には、さらに鋼板の成分に関する情報が含まれていることを特徴とする。 The finished side temperature control method for a steel sheet according to the present invention is characterized in that, in the above invention, the rolling specifications further include information on the components of the steel sheet.

本発明に係る鋼板の仕上出側温度制御方法は、上記発明において、前記仕上出側温度予測モデルは、重回帰分析又は機械学習によって生成されていることを特徴とする。 The finished side temperature control method for a steel sheet according to the present invention is characterized in that, in the above invention, the finished side temperature prediction model is generated by multiple regression analysis or machine learning.

本発明に係る鋼板の仕上出側温度制御方法は、上記発明において、前記圧延諸元には、鋼板の鋼種、板厚、板幅、圧延速度、圧延荷重、前記連続圧延設備の入側における鋼板の温度、及び前記複数の冷却設備の吐出パターンに関する情報が含まれていることを特徴とする。 In the above invention, the method for controlling the temperature on the finishing side of a steel sheet according to the present invention includes the steel type, thickness, width, rolling speed, rolling load, and steel sheet on the entry side of the continuous rolling facility in the rolling specifications. It is characterized by containing information on the temperature of the rolling mill and the discharge patterns of the plurality of cooling facilities.

本発明に係る鋼板の仕上出側温度制御装置は、鋼板の圧延方向に配列された複数の圧延機を利用して鋼板を連続的に圧延する連続圧延設備の出側における鋼板の温度を制御する鋼板の仕上出側温度制御装置であって、過去に圧延された鋼板の圧延諸元と前記温度の実績値とから生成された、鋼板の圧延諸元を入力変数、前記温度の予測値を出力変数とする仕上出側温度予測モデルに対して、圧延対象の鋼板の圧延諸元を入力することによって、圧延対象の鋼板について前記温度の予測値を算出し、前記圧延機間に設けられ、前記鋼板に冷却水を吐出する複数の冷却設備の吐出パターンを前記予測値に基づいて制御する手段を備え、前記圧延諸元には、少なくとも冷却水の温度に直接若しくは間接的に関連する情報が含まれていることを特徴とする。 The finishing side temperature control device for a steel plate according to the present invention controls the temperature of the steel plate on the exit side of a continuous rolling facility that continuously rolls the steel plate by using a plurality of rolling mills arranged in the rolling direction of the steel plate. It is a temperature control device on the finishing side of the steel plate, and the rolling specifications of the steel plate generated from the rolling specifications of the steel plate rolled in the past and the actual value of the temperature are input variables, and the predicted value of the temperature is output. By inputting the rolling specifications of the steel sheet to be rolled into the finish-side temperature prediction model as a variable, the predicted value of the temperature of the steel sheet to be rolled is calculated, and it is provided between the rolling mills. A means for controlling the discharge pattern of a plurality of cooling facilities for discharging cooling water to a steel plate based on the predicted value is provided, and the rolling specifications include information directly or indirectly related to at least the temperature of the cooling water. It is characterized by being rolled.

本発明に係る鋼板の製造方法は、本発明に係る鋼板の仕上出側温度制御方法を利用して鋼板を製造するステップを含むことを特徴とする。 The method for producing a steel sheet according to the present invention is characterized by including a step of producing a steel sheet by utilizing the method for controlling the temperature on the finishing side of the steel sheet according to the present invention.

本発明に係る鋼板の仕上出側温度制御方法及び仕上出側温度制御装置によれば、複雑な調整を必要とすることなく、鋼板の仕上出側温度を精度よく目標温度に制御することができる。また、本発明に係る鋼板の製造方法によれば、設備故障の発生を抑制しつつ、鋼板を歩留まりよく製造することができる。 According to the finishing side temperature control method and the finishing side temperature control device of the steel sheet according to the present invention, the finishing side temperature of the steel sheet can be accurately controlled to the target temperature without requiring complicated adjustment. .. Further, according to the method for manufacturing a steel sheet according to the present invention, it is possible to manufacture a steel sheet with a high yield while suppressing the occurrence of equipment failure.

図1は、本発明の一実施形態である鋼板の圧延制御装置が適用される連続圧延設備の構成を示す模式図である。FIG. 1 is a schematic view showing a configuration of a continuous rolling facility to which a rolling control device for a steel sheet according to an embodiment of the present invention is applied. 図2は、本発明の一実施形態である鋼板の圧延制御装置の構成を示すブロック図である。FIG. 2 is a block diagram showing a configuration of a rolling control device for a steel sheet according to an embodiment of the present invention. 図3は、仕上出側温度予測モデルの構成を示す模式図である。FIG. 3 is a schematic diagram showing the configuration of the finish side temperature prediction model. 図4は、本発明の一実施形態である吐出パターン決定処理の流れを示すフローチャートである。FIG. 4 is a flowchart showing the flow of the discharge pattern determination process according to the embodiment of the present invention. 図5は、本発明手法及び従来手法による仕上出側温度の予測精度を示す散布図である。FIG. 5 is a scatter diagram showing the prediction accuracy of the finish side temperature by the method of the present invention and the conventional method.

以下、図面を参照して、本発明の一実施形態である鋼板の圧延制御装置の構成及び動作について説明する。 Hereinafter, the configuration and operation of the rolling control device for the steel sheet according to the embodiment of the present invention will be described with reference to the drawings.

〔連続圧延設備の構成〕
まず、図1を参照して、本発明の一実施形態である鋼板の圧延制御装置が適用される連続圧延設備の構成について説明する。
[Structure of continuous rolling equipment]
First, with reference to FIG. 1, the configuration of a continuous rolling facility to which the rolling control device for a steel sheet according to the embodiment of the present invention is applied will be described.

図1は、本発明の一実施形態である鋼板の圧延制御装置が適用される連続圧延設備の構成を示す模式図である。図1に示すように、本発明の一実施形態である鋼板の圧延制御装置が適用される連続圧延設備1は、矢印A方向に搬送される鋼板を連続的に圧延する複数(本例では7台)の圧延スタンド2a〜2gと、圧延スタンド2a〜2g間に設けられ、鋼板Sの上下面に冷却水を吐出することによって鋼板Sを冷却する複数(本例では16本)の冷却設備3と、を備えている。 FIG. 1 is a schematic view showing a configuration of a continuous rolling facility to which a rolling control device for a steel sheet according to an embodiment of the present invention is applied. As shown in FIG. 1, the continuous rolling equipment 1 to which the rolling control device for steel sheets according to the embodiment of the present invention is applied is a plurality of continuous rolling facilities 1 for continuously rolling steel sheets conveyed in the direction of arrow A (7 in this example). A plurality of (16 in this example) cooling facilities 3 provided between the rolling stands 2a to 2g and the rolling stands 2a to 2g to cool the steel sheet S by discharging cooling water to the upper and lower surfaces of the steel sheet S. And has.

〔圧延制御装置の構成〕
次に、図2を参照して、本発明の一実施形態である鋼板の圧延制御装置の構成について説明する。
[Structure of rolling control device]
Next, the configuration of the rolling control device for the steel sheet according to the embodiment of the present invention will be described with reference to FIG.

図2は、本発明の一実施形態である鋼板の圧延制御装置の構成を示すブロック図である。図2に示すように、本発明の一実施形態である鋼板の圧延制御装置10(以下、圧延制御装置10と略記)は、コンピュータ等の周知の情報処理装置によって構成され、図1に示す連続圧延設備1における鋼板Sの圧延処理を制御する。本実施形態では、圧延制御装置10には、連続圧延設備1の入側及び出側における鋼板Sの温度(仕上入側温度、仕上出側温度)を検出する温度センサ11a,11b、連続圧延設備1において圧延される鋼板Sの圧延諸元に関する情報を格納しているプロセスコンピュータ12、及び連続圧延設備1において過去に圧延された鋼板Sの圧延諸元と鋼板Sの仕上出側温度の実績値との組を操業データとして格納している操業データデータベース(操業データDB)13が接続されている。 FIG. 2 is a block diagram showing a configuration of a rolling control device for a steel sheet according to an embodiment of the present invention. As shown in FIG. 2, the rolling control device 10 for steel sheets (hereinafter abbreviated as rolling control device 10) according to an embodiment of the present invention is composed of a well-known information processing device such as a computer, and is continuously shown in FIG. The rolling process of the steel sheet S in the rolling equipment 1 is controlled. In the present embodiment, the rolling control device 10 includes temperature sensors 11a and 11b for detecting the temperature of the steel sheet S (finishing inlet side temperature, finishing exit side temperature) on the entrance side and the exit side of the continuous rolling equipment 1, and the continuous rolling equipment. The actual value of the rolling specifications of the steel sheet S rolled in the past and the finishing side temperature of the steel sheet S in the process computer 12 storing the information on the rolling specifications of the steel sheet S rolled in 1 and the continuous rolling equipment 1. An operation data database (operation data DB) 13 that stores the set with and as operation data is connected.

圧延制御装置10は、情報処理装置内のCPU(Central Processing Unit)等の演算処理装置がメモリ等の記憶部に記憶されているコンピュータプログラムを実行することにより、仕上出側温度予測モデル生成部10a、吐出パターン決定部10b、及び吐出パターン制御部10cとして機能する。 The rolling control device 10 is a finishing side temperature prediction model generation unit 10a by executing a computer program in which an arithmetic processing unit such as a CPU (Central Processing Unit) in the information processing device is stored in a storage unit such as a memory. , It functions as a discharge pattern determination unit 10b and a discharge pattern control unit 10c.

仕上出側温度予測モデル生成部10aは、操業データDB13内に格納されている操業データを用いて、圧延対象の鋼板Sの圧延諸元を入力変数(説明変数)、圧延対象の鋼板Sの仕上出側温度の予測値を出力変数(目的変数)とする仕上出側温度予測モデルを生成する。仕上出側温度予測モデルの詳細については後述する。 The finishing side temperature prediction model generation unit 10a uses the operation data stored in the operation data DB 13 to input the rolling specifications of the steel sheet S to be rolled as an input variable (explanatory variable) and finish the steel sheet S to be rolled. A finished output side temperature prediction model is generated using the predicted value of the output side temperature as an output variable (objective variable). The details of the finish side temperature prediction model will be described later.

吐出パターン決定部10bは、仕上出側温度予測モデルを用いて後述する吐出パターン決定処理を実行することにより、鋼板Sの仕上出側温度を目標温度に制御する複数の冷却設備3の吐出パターン(各冷却設備3のオン/オフ設定)を決定する。 The discharge pattern determination unit 10b executes the discharge pattern determination process described later using the finish-out side temperature prediction model to control the finish-out side temperature of the steel sheet S to the target temperature. On / off setting of each cooling facility 3) is determined.

吐出パターン制御部10cは、吐出パターン決定部10bによって決定された吐出パターンに従って複数の冷却設備3のオン/オフを制御する。 The discharge pattern control unit 10c controls on / off of the plurality of cooling facilities 3 according to the discharge pattern determined by the discharge pattern determination unit 10b.

〔仕上出側温度予測モデルの構成〕
次に、図3を参照して、仕上出側温度予測モデル生成部10aが生成する仕上出側温度予測モデルの構成について説明する。
[Structure of finish side temperature prediction model]
Next, with reference to FIG. 3, the configuration of the finish side temperature prediction model generated by the finish side temperature prediction model generation unit 10a will be described.

図3は、仕上出側温度予測モデルの構成を示す模式図である。図3に示すように、仕上出側温度予測モデルは、鋼板Sの圧延諸元の実績値を入力変数、鋼板Sの仕上出側温度の実績値を出力変数として重回帰分析又は機械学習を実行することによって生成されており、入力層、中間層(隠れ層)、及び出力層を備えている。機械学習の場合には深層学習(ディープラーニング)されたニューラルネットワーク等を用いることができる。仕上出側温度予測モデルの入力層には、圧延対象の鋼板Sの圧延諸元が入力される。中間層のパラメータは、鋼板Sの圧延諸元及び仕上出側温度の実績値を用いて重回帰分析又は機械学習により調整されている。出力層は、入力層に入力された圧延諸元に対応する鋼板Sの仕上出側温度の予測値を出力する。 FIG. 3 is a schematic diagram showing the configuration of the finish side temperature prediction model. As shown in FIG. 3, the finishing side temperature prediction model executes multiple regression analysis or machine learning with the actual value of the rolling specifications of the steel sheet S as an input variable and the actual value of the finishing side temperature of the steel sheet S as an output variable. It is generated by rolling and has an input layer, an intermediate layer (hidden layer), and an output layer. In the case of machine learning, a deep-learned neural network or the like can be used. The rolling specifications of the steel sheet S to be rolled are input to the input layer of the finish side temperature prediction model. The parameters of the intermediate layer are adjusted by multiple regression analysis or machine learning using the actual values of the rolling specifications and the finishing side temperature of the steel sheet S. The output layer outputs a predicted value of the finishing side temperature of the steel sheet S corresponding to the rolling specifications input to the input layer.

ここで、鋼板Sの圧延諸元としては、鋼板Sの鋼種、板厚、板幅、圧延速度(圧延スタンド毎)、圧延荷重(圧延スタンド毎)、仕上入側温度、複数の冷却設備3の吐出パターン、圧延時期、鋼板Sの成分(C,Mn,P,S,Si,Cu,Al,N,Ti,Nb,B,Cr,Mo,Ni,V)、及び冷却水温に関する情報が含まれている。ここでいう冷却水温に関する情報は上記した「冷却水の温度に直接若しくは間接的に関連する情報」に対応したものであり、冷却水の水温そのものの他、季節等の要因によって変化する冷却水温を表すものとして、圧延時期や圧延年月日、さらには時刻等を用いることができる。 Here, the rolling specifications of the steel plate S include the steel type of the steel plate S, the plate thickness, the plate width, the rolling speed (for each rolling stand), the rolling load (for each rolling stand), the finish side temperature, and the plurality of cooling facilities 3. Includes information on discharge pattern, rolling timing, steel sheet S components (C, Mn, P, S, Si, Cu, Al, N, Ti, Nb, B, Cr, Mo, Ni, V), and cooling water temperature. ing. The information on the cooling water temperature here corresponds to the above-mentioned "information directly or indirectly related to the cooling water temperature", and the cooling water temperature that changes depending on factors such as the season as well as the cooling water temperature itself. As a representation, the rolling time, the rolling date, the time, and the like can be used.

〔吐出パターン決定処理〕
次に、図4を参照して、吐出パターン決定部10bが実行する吐出パターン決定処理について説明する。
[Discharge pattern determination process]
Next, the discharge pattern determination process executed by the discharge pattern determination unit 10b will be described with reference to FIG.

図4は、本発明の一実施形態である吐出パターン決定処理の流れを示すフローチャートである。図4に示すフローチャートは、鋼板Sの圧延処理を開始する前の所定のタイミングで開始となり、吐出パターン決定処理はステップS1の処理に進む。 FIG. 4 is a flowchart showing the flow of the discharge pattern determination process according to the embodiment of the present invention. The flowchart shown in FIG. 4 starts at a predetermined timing before the rolling process of the steel sheet S is started, and the discharge pattern determination process proceeds to the process of step S1.

ステップS1の処理では、吐出パターン決定部10bが、圧延対象の鋼板Sの圧延諸元に関する情報(諸元情報)をプロセスコンピュータ12から取得して読み込む。これにより、ステップS1の処理は完了し、吐出パターン決定処理はステップS2の処理に進む。 In the process of step S1, the discharge pattern determining unit 10b acquires and reads information (specification information) regarding the rolling specifications of the steel sheet S to be rolled from the process computer 12. As a result, the process of step S1 is completed, and the discharge pattern determination process proceeds to the process of step S2.

ステップS2の処理では、吐出パターン決定部10bが、ステップS1の処理において読み込んだ諸元情報を仕上出側温度予測モデルに入力することにより、圧延対象の鋼板Sの仕上出側温度の予測値を算出する。これにより、ステップS2の処理は完了し、吐出パターン決定処理はステップS3の処理に進む。 In the process of step S2, the discharge pattern determination unit 10b inputs the specification information read in the process of step S1 into the finish side temperature prediction model to obtain a predicted value of the finish side temperature of the steel sheet S to be rolled. calculate. As a result, the process of step S2 is completed, and the discharge pattern determination process proceeds to the process of step S3.

ステップS3の処理では、吐出パターン決定部10bが、ステップS2の処理によって算出された仕上出側温度の予測値が圧延対象の鋼板Sについて定められた指定範囲内にあるか否かを判別する。判別の結果、指定範囲内にある場合(ステップS3:Yes)、吐出パターン決定部10bは、吐出パターン決定処理をステップS4の処理に進める。一方、指定範囲内にない場合には(ステップS3:No)、吐出パターン決定部10bは、予め設定されている吐出パターンの使用優先順位に従って諸元情報で設定されている複数の冷却設備3の吐出パターンを変更した後、吐出パターン決定処理をステップS2の処理に戻す。 In the process of step S3, the discharge pattern determining unit 10b determines whether or not the predicted value of the finish side temperature calculated by the process of step S2 is within the designated range defined for the steel sheet S to be rolled. If the result of the determination is within the designated range (step S3: Yes), the discharge pattern determination unit 10b advances the discharge pattern determination process to the process of step S4. On the other hand, if it is not within the specified range (step S3: No), the discharge pattern determination unit 10b of the plurality of cooling facilities 3 set in the specification information according to the use priority of the discharge pattern set in advance. After changing the discharge pattern, the discharge pattern determination process is returned to the process of step S2.

ステップS4の処理では、吐出パターン決定部10bが、ステップS2の処理において用いた諸元情報で設定されている複数の冷却設備3の吐出パターンを最終的な吐出パターンに決定する。以後、吐出パターン制御部10cが、鋼板Sの圧延処理が実行されている間、吐出パターン決定部10bが決定した最終的な吐出パターンに従って複数の冷却設備3の吐出パターンを制御する。これにより、ステップS4の処理は完了し、一連の吐出パターン決定処理は終了する。 In the process of step S4, the discharge pattern determining unit 10b determines the discharge patterns of the plurality of cooling facilities 3 set in the specification information used in the process of step S2 as the final discharge pattern. After that, the discharge pattern control unit 10c controls the discharge patterns of the plurality of cooling facilities 3 according to the final discharge pattern determined by the discharge pattern determination unit 10b while the rolling process of the steel sheet S is being executed. As a result, the process of step S4 is completed, and a series of discharge pattern determination processes is completed.

以上の説明から明らかなように、本発明の一実施形態である鋼板の圧延制御装置10は、過去に圧延された鋼板Sの圧延諸元と仕上出側温度の実績値とから生成された、鋼板Sの圧延諸元を入力変数、鋼板Sの仕上出側温度の予測値を出力変数とする仕上出側温度予測モデルに対して、圧延対象の鋼板Sの圧延諸元を入力することによって、圧延対象の鋼板Sについて仕上出側温度の予測値を算出し、圧延スタンド2a〜2g間に設けられ、鋼板Sに冷却水を吐出する複数の冷却設備3の吐出パターンを仕上出側温度の予測値に基づいて制御し、鋼板Sの圧延諸元には、少なくとも冷却水の温度に直接若しくは間接的に関連する情報が含まれているので、複雑な調整を必要とすることなく、鋼板Sの仕上出側温度を精度よく目標温度に制御できる。また、これにより、設備故障の発生を抑制しつつ、鋼板Sを歩留まりよく製造することができる。 As is clear from the above description, the rolling control device 10 for a steel sheet according to an embodiment of the present invention is generated from the rolling specifications of the steel sheet S rolled in the past and the actual value of the finishing side temperature. By inputting the rolling specifications of the steel plate S to be rolled into the finishing side temperature prediction model in which the rolling specifications of the steel plate S are input variables and the predicted value of the finishing side temperature of the steel plate S is the output variable. A predicted value of the finishing side temperature is calculated for the steel sheet S to be rolled, and the discharge patterns of a plurality of cooling facilities 3 provided between the rolling stands 2a to 2g and discharging cooling water to the steel sheet S are used to predict the finishing side temperature. Controlled based on the values, the rolling specifications of the steel sheet S contain at least information directly or indirectly related to the temperature of the cooling water, so that the steel sheet S does not require complicated adjustments. The temperature on the finishing side can be accurately controlled to the target temperature. Further, as a result, the steel sheet S can be manufactured with a high yield while suppressing the occurrence of equipment failure.

図5は、本発明手法及び従来手法による仕上出側温度の予測精度を示す散布図である。本実施例では、極低炭素鋼1000サンプルを対象として、従来の仕上出側温度予測手法(従来手法)と本発明の仕上出側温度予測手法(本発明手法)についてシミュレーションによる比較を行った。図5の横軸は仕上出側温度の実績値(FDT実績)を示し、縦軸は仕上出側温度の予測値(FDT予測)を示す。図5に示すように、従来手法では、仕上出側温度の予測誤差σは14.1℃であったのに対して、本発明手法では、仕上出側温度の予測誤差σは5.1℃であった。これにより、本発明によれば、仕上出側温度を精度よく予測し、結果として、仕上出側温度を精度よく目標温度に制御できることが確認された。 FIG. 5 is a scatter diagram showing the prediction accuracy of the finish side temperature by the method of the present invention and the conventional method. In this example, the conventional finishing side temperature prediction method (conventional method) and the finishing side temperature prediction method of the present invention (the method of the present invention) were compared by simulation for 1000 samples of ultra-low carbon steel. The horizontal axis of FIG. 5 shows the actual value of the finishing side temperature (FDT actual value), and the vertical axis shows the predicted value of the finishing side temperature (FDT prediction). As shown in FIG. 5, in the conventional method, the prediction error σ of the finish side temperature was 14.1 ° C., whereas in the method of the present invention, the prediction error σ of the finish side temperature was 5.1 ° C. Met. As a result, according to the present invention, it was confirmed that the finish side temperature can be accurately predicted, and as a result, the finish side temperature can be accurately controlled to the target temperature.

以上、本発明者らによってなされた発明を適用した実施形態について説明したが、本実施形態による本発明の開示の一部をなす記述及び図面により本発明は限定されることはない。すなわち、本実施形態に基づいて当業者等によりなされる他の実施の形態、実施例、及び運用技術等は全て本発明の範疇に含まれる。 Although the embodiment to which the invention made by the present inventors has been applied has been described above, the present invention is not limited by the description and the drawings which form a part of the disclosure of the present invention according to the present embodiment. That is, other embodiments, examples, operational techniques, and the like made by those skilled in the art based on the present embodiment are all included in the category of the present invention.

1 連続圧延設備
2a〜2g 圧延スタンド
3 冷却設備
10 圧延制御装置
10a 仕上出側温度予測モデル生成部
10b 吐出パターン決定部
10c 吐出パターン制御部
11a,11b 温度センサ
12 プロセスコンピュータ
13 操業データデータベース(操業データDB)
S 鋼板
1 Continuous rolling equipment 2a to 2g Rolling stand 3 Cooling equipment 10 Rolling control device 10a Finishing side temperature prediction model generation unit 10b Discharge pattern determination unit 10c Discharge pattern control unit 11a, 11b Temperature sensor 12 Process computer 13 Operation data database (operation data) DB)
S steel plate

Claims (6)

鋼板の圧延方向に配列された複数の圧延機を利用して鋼板を連続的に圧延する連続圧延設備の出側における鋼板の温度を制御する鋼板の仕上出側温度制御方法であって、
過去に圧延された鋼板の圧延諸元と前記温度の実績値とから生成された、鋼板の圧延諸元を入力変数、前記温度の予測値を出力変数とする仕上出側温度予測モデルに対して、圧延対象の鋼板の圧延諸元を入力することによって、圧延対象の鋼板について前記温度の予測値を算出し、前記圧延機間に設けられ、前記鋼板に冷却水を吐出する複数の冷却設備の吐出パターンを前記予測値に基づいて制御するステップを含み、
前記圧延諸元には、少なくとも冷却水の温度に直接若しくは間接的に関連する情報が含まれていることを特徴とする鋼板の仕上出側温度制御方法。
A method for controlling the temperature on the finishing side of a steel sheet, which controls the temperature of the steel sheet on the output side of a continuous rolling facility that continuously rolls the steel sheet using a plurality of rolling mills arranged in the rolling direction of the steel sheet.
For a finishing-side temperature prediction model that uses the rolling specifications of the steel sheet as the input variable and the predicted value of the temperature as the output variable, which is generated from the rolling specifications of the steel sheet rolled in the past and the actual value of the temperature. By inputting the rolling specifications of the steel sheet to be rolled, the predicted value of the temperature of the steel sheet to be rolled is calculated, and a plurality of cooling facilities provided between the rolling mills and discharging cooling water to the steel sheet are provided. Including a step of controlling the discharge pattern based on the predicted value.
A method for controlling the temperature on the finishing side of a steel sheet, wherein the rolling specifications include at least information directly or indirectly related to the temperature of the cooling water.
前記圧延諸元には、さらに鋼板の成分に関する情報が含まれていることを特徴とする請求項1に記載の鋼板の仕上出側温度制御方法。 The finishing-out side temperature control method for a steel sheet according to claim 1, wherein the rolling specifications further include information on the components of the steel sheet. 前記仕上出側温度予測モデルは、重回帰分析又は機械学習によって生成されていることを特徴とする請求項1又は2に記載の鋼板の仕上出側温度制御方法。 The method for controlling the temperature of the finished side of a steel sheet according to claim 1 or 2, wherein the finished side temperature prediction model is generated by multiple regression analysis or machine learning. 前記圧延諸元には、鋼板の鋼種、板厚、板幅、圧延速度、圧延荷重、前記連続圧延設備の入側における鋼板の温度、及び前記複数の冷却設備の吐出パターンに関する情報が含まれていることを特徴とする請求項1〜3のうち、いずれか1項に記載の鋼板の仕上出側温度制御方法。 The rolling specifications include information on the steel type, thickness, thickness, rolling speed, rolling load, temperature of the steel sheet on the entrance side of the continuous rolling equipment, and discharge patterns of the plurality of cooling equipments. The method for controlling the temperature on the finishing side of a steel sheet according to any one of claims 1 to 3, wherein the temperature is controlled. 鋼板の圧延方向に配列された複数の圧延機を利用して鋼板を連続的に圧延する連続圧延設備の出側における鋼板の温度を制御する鋼板の仕上出側温度制御装置であって、
過去に圧延された鋼板の圧延諸元と前記温度の実績値とから生成された、鋼板の圧延諸元を入力変数、前記温度の予測値を出力変数とする仕上出側温度予測モデルに対して、圧延対象の鋼板の圧延諸元を入力することによって、圧延対象の鋼板について前記温度の予測値を算出し、前記圧延機間に設けられ、前記鋼板に冷却水を吐出する複数の冷却設備の吐出パターンを前記予測値に基づいて制御する手段を備え、
前記圧延諸元には、少なくとも冷却水の温度に直接若しくは間接的に関連する情報が含まれていることを特徴とする鋼板の仕上出側温度制御装置。
A steel sheet finish-out side temperature control device that controls the temperature of a steel sheet on the output side of a continuous rolling facility that continuously rolls a steel sheet using a plurality of rolling mills arranged in the rolling direction of the steel sheet.
For a finishing-side temperature prediction model that uses the rolling specifications of the steel sheet as the input variable and the predicted value of the temperature as the output variable, which is generated from the rolling specifications of the steel sheet rolled in the past and the actual value of the temperature. By inputting the rolling specifications of the steel sheet to be rolled, the predicted value of the temperature of the steel sheet to be rolled is calculated, and a plurality of cooling facilities provided between the rolling mills and discharging cooling water to the steel sheet are provided. A means for controlling the discharge pattern based on the predicted value is provided.
A finishing-side temperature control device for a steel sheet, characterized in that the rolling specifications include at least information directly or indirectly related to the temperature of the cooling water.
請求項1〜4のうち、いずれか1項に記載の鋼板の仕上出側温度制御方法を利用して鋼板を製造するステップを含むことを特徴とする鋼板の製造方法。 A method for manufacturing a steel sheet, which comprises a step of manufacturing the steel sheet by using the method for controlling the temperature on the finishing side of the steel sheet according to any one of claims 1 to 4.
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