JP4894686B2 - Manufacturing method and manufacturing apparatus for hot-rolled steel sheet - Google Patents

Manufacturing method and manufacturing apparatus for hot-rolled steel sheet Download PDF

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JP4894686B2
JP4894686B2 JP2007227771A JP2007227771A JP4894686B2 JP 4894686 B2 JP4894686 B2 JP 4894686B2 JP 2007227771 A JP2007227771 A JP 2007227771A JP 2007227771 A JP2007227771 A JP 2007227771A JP 4894686 B2 JP4894686 B2 JP 4894686B2
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久好 橘
康彦 武衛
達朗 本田
千尋 植松
繁政 中川
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Sumitomo Metal Industries Ltd
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Description

本発明は、熱延鋼板の製造方法及び製造装置に関し、具体的には、熱間圧延機と、水冷装置と、巻取機と、水冷装置を制御する制御コントローラとを備える熱延鋼板の製造装置及び製造方法に関する。 TECHNICAL FIELD The present invention relates to a method and an apparatus for manufacturing a hot-rolled steel sheet, specifically, a hot-rolled steel sheet including a hot rolling mill, a water cooling device, a winder, and a control controller that controls the water cooling device. The present invention relates to an apparatus and a manufacturing method.

図８は、熱延鋼板の製造装置０の一例を模式的に示す説明図である。
周知のように、熱延鋼板の製造では、仕上圧延機２により９００℃程度の仕上温度で熱間圧延を行われた高温の鋼板１を、搬送テーブル３により搬送する。そして、この搬送テーブル３に設置された水冷装置５により鋼板１に冷却水を噴射して所定の巻取温度まで冷却し、その後に巻取装置４でコイルに巻き取る。熱延鋼板の機械特性は巻取温度により支配されるので、所望の機械特性を有する熱延鋼板を製造するには、巻取温度の管理、すなわち水冷装置５を用いた冷却による巻取温度の制御精度を向上することが極めて重要である。この水冷装置５は、開度が独立して制御可能である、鋼板１の搬送方向へ向けて並設された複数（図示例ではｎ個）の水量調整バルブを有し、鋼板１へ向けて噴射する冷却水の水量を調整する。 FIG. 8 is an explanatory view schematically showing an example of a hot-rolled steel sheet manufacturing apparatus 0.
As is well known, in manufacturing a hot-rolled steel sheet, a hot steel sheet 1 that has been hot-rolled by a finishing mill 2 at a finishing temperature of about 900 ° C. is transported by a transport table 3. Then, cooling water is sprayed onto the steel sheet 1 by the water cooling device 5 installed on the transfer table 3 to cool it to a predetermined winding temperature, and then wound around the coil by the winding device 4. Since the mechanical properties of the hot-rolled steel sheet are governed by the coiling temperature, in order to produce a hot-rolled steel sheet having the desired mechanical properties, the coiling temperature is controlled by controlling the coiling temperature, that is, by using the water-cooling device 5. It is extremely important to improve the control accuracy. This water cooling device 5 has a plurality of (n in the illustrated example) water amount adjustment valves arranged in parallel in the conveying direction of the steel plate 1, the opening degree of which can be controlled independently, toward the steel plate 1. Adjust the amount of cooling water to be injected.

図８における符号６は仕上圧延機２の出口における鋼板１の温度を測定するための仕上出口温度計を示し、符号７は巻取温度を測定するための巻取温度計を示し、符号９は鋼板板厚測定装置を示し、符号１０は鋼板速度測定装置を示し、符号１１は鋼板温度予測装置を示し、さらに符号１２は各水量調整バルブの開度を制御する冷却制御装置を示す。以降の説明では、鋼板温度予測装置１１及び冷却制御装置１２をまとめて制御コントローラ１３という。   Reference numeral 6 in FIG. 8 indicates a finishing outlet thermometer for measuring the temperature of the steel sheet 1 at the exit of the finishing mill 2, reference numeral 7 indicates a winding thermometer for measuring the winding temperature, and reference numeral 9 indicates A steel plate thickness measuring device is shown. Reference numeral 10 denotes a steel plate speed measuring device. Reference numeral 11 denotes a steel plate temperature predicting device. Reference numeral 12 denotes a cooling control device for controlling the opening of each water amount adjusting valve. In the following description, the steel plate temperature prediction device 11 and the cooling control device 12 are collectively referred to as a controller 13.

仕上圧延機２により圧延された鋼板１が仕上出口温度計６を通過する際、所定の周期で鋼板１の表面温度及び板厚を測定するとともに、鋼板１の上にサンプリング点を設定する。鋼板温度予測装置１１は、このサンプリング点の温度、板厚と水冷装置５を通過する際の通過速度、鋼板１の比熱、密度、水冷装置５の水量、水温及び気温に基づいて、このサンプリング点が巻取温度計７に到達する時の鋼板１の温度を、演算により予測する。   When the steel plate 1 rolled by the finishing mill 2 passes through the finishing outlet thermometer 6, the surface temperature and the plate thickness of the steel plate 1 are measured at a predetermined cycle, and a sampling point is set on the steel plate 1. The steel plate temperature prediction device 11 is based on the sampling point temperature, the plate thickness and the passing speed when passing through the water cooling device 5, the specific heat of the steel plate 1, the density, the water amount of the water cooling device 5, the water temperature and the air temperature. Predicts the temperature of the steel sheet 1 when it reaches the winding thermometer 7 by calculation.

冷却制御装置１２は、鋼板１の巻取温度の予測値が目標値に一致しない場合には、巻取温度の予測値が目標値に一致するように、水冷装置５の各水量調整バルブの開度を変更して設定する。また、冷却制御装置１２は、巻取温度計７による巻取温度の測定値が目標値と一致しない場合には、巻取温度の予測値が目標値に一致するようにフィードバック制御を行って、水冷装置５の各水量調整バルブの開度を変更して設定する。   When the predicted value of the coiling temperature of the steel sheet 1 does not match the target value, the cooling control device 12 opens each water amount adjustment valve of the water cooling device 5 so that the predicted value of the coiling temperature matches the target value. Change and set the degree. In addition, when the measured value of the coiling temperature by the coiling thermometer 7 does not match the target value, the cooling control device 12 performs feedback control so that the predicted value of the coiling temperature matches the target value, The opening degree of each water amount adjustment valve of the water cooling device 5 is changed and set.

以上の処理、すなわち（ａ）仕上出口温度計６による測定、（ｂ）巻取温度の予測、（ｃ）水冷装置５の水量調整バルブの開度の変更設定を、鋼板１が搬送テーブル３上にある間所定の周期で行い、この周期で水冷装置５の水量調整バルブの設定及びその変更を順次行うことにより、搬送テーブル３を通過して冷却された鋼板１の温度が、巻取装置４の入側の巻取温度計７に到達した時に、巻取温度の目標値に一致するべく、制御する。   The steel plate 1 is on the transfer table 3 for the above processing, that is, (a) measurement by the finishing outlet thermometer 6, (b) prediction of the coiling temperature, and (c) change setting of the water amount adjustment valve of the water cooling device 5. The temperature of the steel sheet 1 that has been cooled by passing through the transfer table 3 is changed by sequentially setting and changing the water amount adjusting valve of the water cooling device 5 in this cycle. When it reaches the winding thermometer 7 on the inlet side, control is performed so as to match the target value of the winding temperature.

この制御方法は、鋼板１の巻取温度の予測値を目標値に制御するものである。このため、巻取温度の制御精度を高めるには、仕上圧延機２から巻取装置４に至るまでの鋼板１の温度の予測計算を高精度で行うことが不可欠になるが、このためには、水冷によって鋼板１から奪われる熱量、及び空冷によって鋼板１から奪われる熱量のみならず、水冷に伴う相変態により鋼板１に発生する発熱量をも正確に予測しなければならない。しかし、これらの熱量すべてを正確に予測することは極めて難しい。   This control method controls the predicted value of the coiling temperature of the steel plate 1 to a target value. For this reason, in order to increase the control accuracy of the coiling temperature, it is indispensable to perform a predictive calculation of the temperature of the steel sheet 1 from the finishing mill 2 to the coiling device 4 with high accuracy. Not only the amount of heat deprived from the steel plate 1 by water cooling and the amount of heat deprived from the steel plate 1 by air cooling, but also the amount of heat generated in the steel plate 1 by the phase transformation accompanying water cooling must be accurately predicted. However, it is extremely difficult to accurately predict all these heat quantities.

そこで、図９に示すように、鋼板１の搬送方向へ向けて複数（図示例では３つ）の水冷装置５ａ〜５ｃを設けるとともに各水冷装置５ａ〜５ｃの間に鋼板１の表面温度を測定することができる中間温度計８ｂ、８ｃを設置すること、いわば、図８に示す水冷装置５を鋼板１の搬送方向へ向けて３つに分割することによって、各水冷装置５ａ〜５ｃに対応する制御コントローラ１３ａ〜１３ｃが担当する冷却制御区間を短縮し、これにより、１つの冷却制御区間における温度予測誤差を小さくすることにより鋼板１の温度の予測計算の制御精度を向上させる発明が開示されている。   Therefore, as shown in FIG. 9, a plurality (three in the illustrated example) of water cooling devices 5a to 5c are provided in the conveying direction of the steel plate 1, and the surface temperature of the steel plate 1 is measured between the water cooling devices 5a to 5c. By installing the intermediate thermometers 8b and 8c that can be performed, that is, by dividing the water cooling device 5 shown in FIG. 8 into three toward the conveying direction of the steel sheet 1, it corresponds to each of the water cooling devices 5a to 5c. An invention is disclosed in which the control accuracy of the prediction calculation of the temperature of the steel sheet 1 is improved by shortening the cooling control section handled by the control controllers 13a to 13c and thereby reducing the temperature prediction error in one cooling control section. Yes.

例えば、特許文献１には、複数の水冷装置それぞれに対して個別の目標温度を設定し、温度検出手段により検出した温度と目標温度との差に応じて複数の水冷装置それぞれを個別に制御することにより、巻取温度の制御精度を向上する発明が開示されている。   For example, in Patent Document 1, an individual target temperature is set for each of a plurality of water cooling devices, and each of the plurality of water cooling devices is individually controlled according to the difference between the temperature detected by the temperature detection means and the target temperature. Thus, an invention for improving the control accuracy of the winding temperature is disclosed.

また、特許文献２には、特許文献１により開示された発明と同様に、複数の水冷装置と温度検出手段とを設け、冷却の途中における鋼板の温度分布を推定演算することにより巻取温度の制御精度を向上する発明が開示されている。   In addition, in Patent Document 2, similarly to the invention disclosed in Patent Document 1, a plurality of water cooling devices and temperature detecting means are provided, and the temperature distribution of the steel sheet during the cooling is estimated and calculated to calculate the coiling temperature. An invention for improving control accuracy is disclosed.

特許文献１、２により開示された発明によれば、熱間圧延時における鋼板の通過速度といった熱間圧延条件が変更されることなく一定である場合には、充分に高い制御精度で鋼板の巻取温度を制御することが可能である。
特開平７−１８５６３２号公報 特公平５−２５５６７号公報 According to the inventions disclosed in Patent Documents 1 and 2, when the hot rolling conditions such as the passing speed of the steel plate during hot rolling are constant without being changed, the winding of the steel plate with sufficiently high control accuracy is possible. It is possible to control the taking temperature.
JP-A-7-185632 Japanese Patent Publication No. 5-25567

しかし、熱延鋼板の実際の製造では、熱間圧延工程の操業変動や加速圧延（圧延中に鋼板速度を加速し、温度低下を抑制する技術）の適用等により、熱間圧延の際における鋼板の通過速度（圧延速度）を、圧延速度の設定値から変更する場合が殆どである。   However, in the actual production of hot-rolled steel sheets, the steel sheets used in hot rolling are subject to operational fluctuations in the hot rolling process and application of accelerated rolling (a technology that accelerates the steel sheet speed during rolling and suppresses temperature drop). In most cases, the passing speed (rolling speed) is changed from the set value of the rolling speed.

また、熱延鋼板の実際の製造では、仕上げ圧延機の出側における鋼板の温度や板厚が何らかの原因により、設定値から外れる場合がある。
圧延速度や、仕上げ圧延機の出側における鋼板の温度や板厚は、いずれも、熱間圧延条件として予めその設定値を定めておき、この設定値に基づいて各水冷装置による冷却も定められる。このため、熱間圧延条件が変更される場合には、水冷装置の冷却条件も再度設定し直さなければならない。 Moreover, in actual manufacture of a hot-rolled steel plate, the temperature and thickness of the steel plate on the exit side of the finish rolling mill may deviate from the set values for some reason.
The rolling speed and the temperature and thickness of the steel plate on the exit side of the finish rolling mill are both set in advance as hot rolling conditions, and cooling by each water cooling device is also determined based on this setting value. . For this reason, when the hot rolling conditions are changed, the cooling conditions of the water cooling apparatus must be set again.

ここで、特許文献１により開示された発明を実施するには、複数の水冷装置それぞれ毎に個別の目標温度を設定する必要がある。このため、上述したように圧延速度等の熱間圧延条件が熱間圧延の途中で変更される場合には、各水冷装置それぞれ毎に個別の目標値を、各水冷装置の設備能力の範囲内で、各水冷装置の全てについて個別かつ迅速に修正して設定しなければならない。しかし、特許文献１には各水冷装置の全ての目標温度を、このように修正して設定する手段が全く開示されていない。このため、特許文献１により開示された発明は、圧延速度等の熱間圧延条件が熱間圧延の途中で変更される場合には充分に対応することができず、巻取温度を目標温度に制御できないおそれがある。   Here, in order to implement the invention disclosed in Patent Document 1, it is necessary to set individual target temperatures for each of the plurality of water cooling devices. For this reason, as described above, when the hot rolling conditions such as the rolling speed are changed during the hot rolling, the individual target value for each water cooling device is set within the range of the facility capacity of each water cooling device. Thus, all the water cooling devices must be individually and quickly corrected and set. However, Patent Document 1 does not disclose any means for correcting and setting all target temperatures of each water cooling device in this way. For this reason, the invention disclosed in Patent Document 1 cannot sufficiently cope with the case where the hot rolling conditions such as the rolling speed are changed during the hot rolling, and the winding temperature is set to the target temperature. It may not be possible to control.

図１０は、水冷装置により冷却される鋼板の温度の一例を経時的に示すグラフである。図１０のグラフに細線で示すように、特許文献１により開示された発明であっても、熱間圧延の際の圧延速度を熱間圧延中に変更しない場合であれば、全ての水冷装置の冷却能力を適切に発揮して鋼板の巻取温度を目標温度に正確に制御することができる。しかし、例えば、圧延速度を熱間圧延中により高速に変更する場合に、図１０のグラフに太線で示すように、この変更の前に最初の水冷装置による冷却の目標温度を高い温度（目標１）に設定してしまっていると、この変更の後に、その後の各水冷装置による冷却条件を、最大の設備能力となるように修正して設定したとしても、目標とする巻取温度を得られなくなる。   FIG. 10 is a graph showing an example of the temperature of the steel sheet cooled by the water cooling device over time. As shown by thin lines in the graph of FIG. 10, even in the invention disclosed by Patent Document 1, if the rolling speed during hot rolling is not changed during hot rolling, all the water cooling devices The coiling temperature of the steel sheet can be accurately controlled to the target temperature by properly exhibiting the cooling capacity. However, for example, when the rolling speed is changed to a higher speed during hot rolling, as shown by the thick line in the graph of FIG. ), After this change, the target coiling temperature can be obtained even if the cooling conditions of each subsequent water cooling device are modified and set to the maximum equipment capacity. Disappear.

また、特許文献２により開示された発明では、温度検出手段以降の水冷装置の設定方法しか記載されていないので、圧延速度を熱間圧延の途中で変更する場合に水冷装置全体の冷却能力を有効に利用しながら巻取温度の制御精度を向上させることはできない。   Further, in the invention disclosed in Patent Document 2, only the method of setting the water cooling device after the temperature detecting means is described, so that the cooling capacity of the entire water cooling device is effective when the rolling speed is changed during the hot rolling. However, it is impossible to improve the control accuracy of the coiling temperature.

このように、複数の水冷装置と各水冷装置の間に設置された温度計とを用いて鋼板の巻取温度を高い制御精度で目標温度に制御しようとしても、従来の発明では、圧延速度等の熱間圧延条件が熱間圧延の途中で変更されると、各水冷装置全ての目標温度を、適切かつ迅速に修正して再度設定することが難しく、鋼板の巻取温度を目標温度に制御できないおそれがある。   Thus, even if it is going to control the coiling temperature of a steel plate to a target temperature with high control accuracy using a plurality of water cooling devices and a thermometer installed between each water cooling device, in the conventional invention, the rolling speed, etc. If the hot rolling conditions are changed during the hot rolling, it is difficult to correct and set the target temperature of all the water cooling devices appropriately and quickly, and the coiling temperature of the steel sheet is controlled to the target temperature. It may not be possible.

本発明は、従来の技術が有するこのような課題に鑑みてなされたものであり、例えば圧延速度、さらには仕上圧延機の出側における鋼板の温度又は板厚といった熱間圧延条件が熱間圧延の途中で変更される圧延操業を行う場合であっても、各水冷装置の全ての目標温度を、適切かつ迅速に修正して設定することができ、これにより、鋼板の巻取温度を目標温度に正確に制御することができる熱延鋼板の製造方法及び製造装置を提供することを目的とする。   The present invention has been made in view of such problems of the prior art, and the hot rolling conditions such as the rolling speed and further the temperature or thickness of the steel sheet at the exit side of the finish rolling mill are hot rolled. Even when performing rolling operations that are changed during the process, all target temperatures of each water cooling device can be corrected and set appropriately and quickly, thereby setting the coiling temperature of the steel sheet to the target temperature. An object of the present invention is to provide a method and apparatus for producing a hot-rolled steel sheet that can be accurately controlled.

図９に示すように、中間温度計８ｂ、８ｃを用いる従来の技術では、１つの制御コントローラ１３ａ、１３ｂ又は１３ｃが制御する冷却制御区間と、一つの水冷装置５ａ、５ｂ又は５ｃとは一対一の関係で対応し、例えば制御コントローラ１３ａは水冷装置５ｂ、５ｃの制御は行わない。このため、従来の技術では、全ての水冷装置５ａ〜５ｃが有する冷却能力を有効に活用するためには、各水冷装置５ａ〜５ｃ毎に適切な目標温度を設定しなければならず、これが困難であった。   As shown in FIG. 9, in the conventional technique using the intermediate thermometers 8b and 8c, the cooling control section controlled by one controller 13a, 13b or 13c and one water cooling device 5a, 5b or 5c are one to one. For example, the controller 13a does not control the water cooling devices 5b and 5c. For this reason, in the prior art, in order to effectively utilize the cooling capacity of all the water cooling devices 5a to 5c, it is necessary to set an appropriate target temperature for each of the water cooling devices 5a to 5c, which is difficult. Met.

これに対し、本発明では、後述する図２に例示するように、少なくとも１つの制御コントローラ１３ａが水冷装置５ａの入側に設置される温度計６から巻取温度計７までの区間に設置される全ての水冷装置５ａ〜５ｃを制御するようにしたこと、換言すれば、全ての水冷装置５ａ〜５ｃに対応して全ての水冷装置５ａ〜５ｃの冷却能力を有効に利用するための第１の制御コントローラ１３ａと、この第１の制御コントローラ１３ａが設定した各水冷装置５ａ〜５ｃの水量調整バルブの設定値を、修正することにより巻取温度の制御精度の向上を図る第２の制御コントローラ１３ｂ又は第３の制御コントローラ１３ｃとの両方を備えることによって、各水冷装置５ａ〜５ｃ毎に適切な目標温度を設定しなくとも、全ての水冷装置５ａ〜５ｃの冷却能力を有効に利用できるという知見に基づくものである。   On the other hand, in the present invention, as illustrated in FIG. 2 described later, at least one controller 13a is installed in a section from the thermometer 6 installed on the inlet side of the water cooling device 5a to the winding thermometer 7. In other words, in order to effectively use the cooling capacities of all the water cooling devices 5a to 5c corresponding to all the water cooling devices 5a to 5c, it is possible to control all the water cooling devices 5a to 5c. The controller 13a and the second controller that improves the control accuracy of the coiling temperature by correcting the set values of the water amount adjusting valves of the water cooling devices 5a to 5c set by the first controller 13a. 13b or the third controller 13c, both of the water cooling devices 5a to 5c can be cooled without setting an appropriate target temperature for each of the water cooling devices 5a to 5c. It is based on the finding that can be effectively utilized capacity.

本発明は、熱間圧延機により熱間圧延を行われてから搬送テーブルにより搬送される鋼板へ向けて、鋼板の搬送方向へ向けて並設された複数基の水冷装置それぞれから、予め定められた熱間圧延条件に基づいて鋼板の巻取温度を演算により予測することにより予め定められる冷却条件で冷却水を噴射することによって鋼板を冷却した後に、巻取機によりコイルに巻き取って熱延鋼板を製造する際に、熱間圧延の途中で、予め定められた熱間圧延条件とは異なる他の熱間圧延条件に変更して熱間圧延を引き続き行う場合に、他の熱間圧延条件と、複数の水冷装置のうちの最上流側に位置する水冷装置の入側における鋼板の温度の測定値とに基づいて、鋼板の巻取温度を目標値とすることが可能な、複数の水冷装置全てにおける冷却条件の設定値を求め、さらに、他の熱間圧延条件と、複数の水冷装置のうちで最も上流側に位置する水冷装置以外の１又は２以上の水冷装置の入側における鋼板の温度の測定値とに基づいて、少なくとも１又は２以上の水冷装置について求めた冷却条件の設定値を、さらに修正して設定すること、及び、水冷装置は、開度が独立して制御可能であって噴射する前記冷却水の水量を調整する複数の水量調整バルブを有するとともに、前記の冷却条件はこの水量調整バルブの開度であることを特徴とする熱延鋼板の製造方法である。 The present invention is preliminarily determined from each of a plurality of water-cooling apparatuses arranged in parallel in the steel sheet transport direction toward the steel sheet transported by the transport table after being hot-rolled by a hot rolling mill. After cooling the steel sheet by injecting cooling water under a predetermined cooling condition by predicting the coiling temperature of the steel sheet by calculation based on the hot rolling conditions, the coil is wound around a coil by a winder and hot rolled. When manufacturing a steel sheet, when changing to another hot rolling condition different from the predetermined hot rolling condition in the course of hot rolling and continuing the hot rolling, other hot rolling conditions And a plurality of water cooling devices capable of setting the coiling temperature of the steel sheet as a target value based on the measured value of the temperature of the steel sheet on the inlet side of the water cooling apparatus located on the most upstream side of the plurality of water cooling apparatuses. Set value of cooling condition for all devices Further, based on other hot rolling conditions and the measured value of the temperature of the steel sheet on the inlet side of one or more water cooling devices other than the water cooling device located on the most upstream side among the plurality of water cooling devices. Further, the setting value of the cooling condition obtained for at least one or two or more water cooling devices is further corrected and set , and the water cooling device can control the opening degree independently and the cooling water to be injected. A method for producing a hot-rolled steel sheet , comprising: a plurality of water amount adjusting valves for adjusting the amount of water, wherein the cooling condition is an opening degree of the water amount adjusting valve .

別の観点からは、本発明は、鋼板の熱間圧延を行うための熱間圧延機と、熱間圧延機により熱間圧延を行われた鋼板を搬送する搬送テーブルと、搬送テーブルにより搬送される鋼板をコイルに巻き取る巻取装置と、鋼板の搬送方向へ向けて複数基並設されるとともに、搬送テーブルにより搬送される鋼板へ向けて、予め定められた熱間圧延条件に基づいて鋼板の巻取温度を演算により予測することにより予め定められる冷却条件で冷却水を噴射することによって鋼板を冷却するための水冷装置と、複数基の水冷装置それぞれの入側における鋼板の温度を測定するとともに、複数基の水冷装置のうちの最下流に位置する水冷装置の出側における鋼板の温度を測定する温度計と、さらに、複数基の水冷装置により冷却される鋼板の巻取温度を演算により予測した結果に基づいて複数基の前記水冷装置を制御することにより巻取温度を目標温度に制御するための制御コントローラとを備える熱延鋼板の製造装置であって、制御コントローラが、熱間圧延の途中で、予め定められた熱間圧延条件とは異なる他の熱間圧延条件に変更して熱間圧延を引き続き行う場合に、他の熱間圧延条件と、複数基の水冷装置のうちの最上流側に位置する水冷装置の入側における鋼板の温度の測定値とに基づいて、鋼板の巻取温度を目標値とすることが可能な、複数基の水冷装置全てにおける冷却条件の設定値を求め、さらに、他の熱間圧延条件と、複数の水冷装置のうちで最も上流側に位置する水冷装置以外の１又は２以上の水冷装置の入側における鋼板の温度の測定値とに基づいて、少なくとも１又は２以上の水冷装置について求めた冷却条件の設定値を、さらに修正して設定すること、及び、水冷装置は、開度が独立して制御可能であって噴射する冷却水の水量を調整する複数の水量調整バルブを有するとともに、前記の冷却条件はこの水量調整バルブの開度であることを特徴とする熱延鋼板の製造装置である。 From another viewpoint, the present invention is conveyed by a hot rolling mill for hot rolling of a steel sheet, a conveying table for conveying a steel sheet hot-rolled by a hot rolling mill, and a conveying table. A winding device that winds a steel plate around a coil, and a plurality of steel plates arranged in parallel in the conveying direction of the steel plate, and a steel plate based on predetermined hot rolling conditions toward the steel plate conveyed by the conveying table The temperature of the steel sheet at the entry side of each of the plurality of water cooling devices is measured by injecting the cooling water under a predetermined cooling condition by predicting the winding temperature of the steel sheet by calculation. In addition, a thermometer that measures the temperature of the steel plate on the outlet side of the water cooling device located at the most downstream of the plurality of water cooling devices, and further calculates the coiling temperature of the steel plate cooled by the plurality of water cooling devices A hot-rolled steel sheet manufacturing apparatus comprising a controller for controlling a coiling temperature to a target temperature by controlling a plurality of the water cooling devices based on a more predicted result, wherein the controller is hot In the middle of rolling, when changing to another hot rolling condition different from the predetermined hot rolling condition and continuing the hot rolling, the other hot rolling conditions and a plurality of water cooling devices Based on the measured value of the temperature of the steel sheet on the inlet side of the water cooling device located on the most upstream side of the water, the setting of the cooling conditions in all the plurality of water cooling devices that can set the coiling temperature of the steel sheet as a target value The value is obtained, and further, the other hot rolling conditions and the measured value of the temperature of the steel sheet on the inlet side of one or more water cooling devices other than the water cooling device located on the most upstream side among the plurality of water cooling devices. Based on at least 1 or 2 The set value of the cooling conditions determined for water-cooling unit of the above, be set by further modifications, and water-cooling device, a plurality of adjusting the quantity of cooling water to be injected be controllable opening independently The apparatus for producing a hot-rolled steel sheet has a water amount adjusting valve, and the cooling condition is an opening degree of the water amount adjusting valve .

これらの本発明では、熱間圧延条件が、熱間圧延の圧延速度、若しくは、熱間圧延機のうちの仕上圧延機の出側における鋼板の温度又は板厚であることが例示される。 In these present inventions, the hot rolling conditions are exemplified by the rolling speed of hot rolling or the temperature or thickness of the steel plate on the exit side of the finishing mill of the hot rolling mills .

上述した本発明を実施するには、複数の水冷装置のうちで最も上流側に位置する水冷装置以外の１又は２以上の水冷装置の入側に温度計を設置する。しかし、通常の放射温度計では冷却水が飛散するような環境下では飛散する冷却水の影響を受けて測定精度が低下する。この対策として、温度計の設置位置付近に水冷装置が存在しない間隙を確保し、この間隙で水パージやエアパージを行って飛散する冷却水を除去すればよいが、これでは、水冷装置を設置できない間隙が増え、水冷装置全体としての冷却能力が減少する。また、冷却能力の減少を容認できたとしても、水パージやエアパージといった除去手段そのものを設けなければならない。そこで、本発明では、鋼板温度の測定値が、飛散する冷却水の影響を受けにくくするため、水による減衰の少ない１．１μｍ以下の帯域の熱放射光を検出して放射温度計測を行うことにより、前記冷却水が飛散する環境においても測温可能な温度計による測定値であることが望ましい。   In order to implement the present invention described above, a thermometer is installed on the inlet side of one or more water cooling devices other than the water cooling device located on the most upstream side among the plurality of water cooling devices. However, in an ordinary radiation thermometer, the measurement accuracy is reduced under the influence of the scattered cooling water in an environment where the cooling water is scattered. As a countermeasure, it is sufficient to secure a gap where there is no water cooling device in the vicinity of the thermometer installation position, and to remove the cooling water scattered by performing water purge or air purge in this gap, but this does not allow the water cooling device to be installed. The gap increases and the cooling capacity of the entire water cooling device decreases. Further, even if the reduction in cooling capacity is acceptable, removal means such as water purge and air purge must be provided. Therefore, in the present invention, in order to make the measured value of the steel sheet temperature less susceptible to the scattered cooling water, the radiation temperature measurement is performed by detecting thermal radiation light in a band of 1.1 μm or less with little attenuation by water. Therefore, it is desirable that the measured value be measured by a thermometer capable of measuring temperature even in an environment where the cooling water is scattered.

これらの本発明では、巻取温度の測定値と目標値の偏差が減少するように水冷装置をフィードバック制御することが望ましい。   In the present invention, it is desirable to feedback control the water cooling device so that the deviation between the measured value of the coiling temperature and the target value is reduced.

本発明により、例えば圧延速度、さらには仕上圧延機の出側における鋼板の温度又は板厚といった熱間圧延条件が熱間圧延の途中で変更される圧延操業を行う場合であっても、各水冷装置の全ての目標温度を、適切かつ迅速に修正して設定することができ、これにより、鋼板の巻取温度を目標温度に正確に制御することができる。   According to the present invention, each water cooling is performed even when a rolling operation is performed in which hot rolling conditions such as the rolling speed and the temperature or thickness of the steel plate at the exit side of the finish rolling mill are changed during the hot rolling. All target temperatures of the apparatus can be corrected and set appropriately and quickly, whereby the coiling temperature of the steel sheet can be accurately controlled to the target temperature.

本発明に係る熱延鋼板の製造方法及び製造装置を実施するための最良の形態を、添付図面を参照しながら、詳細に説明する。
図１は、熱延鋼板を製造する本実施の形態の製造装置２０の要部を示す説明図である。図１における符号１は鋼板を示し、符号２は仕上圧延機を一部省略して示し、符号３は搬送テーブルを示し、符号４は巻取装置を示し、符号５は制御可能なｎ個の冷却ヘッダーとこれらの冷却ヘッダーに供給する水量を調整するバルブとを備える水冷装置を示し、符号７は巻取温度計を示し、符号８は中間温度計を示し、符号９は鋼板板厚測定装置を示し、符号１０は鋼板速度測定装置を示し、符号１１は鋼板温度予測装置を示し、符号１２は水量調整バルブを制御する冷却制御装置であって、巻取温度計７により測定した実績巻取温度と目標巻取温度との差を小さくするフィードバック制御機能を有する。以下、鋼板温度予測装置１１と冷却制御装置１２とをまとめて制御コントローラ１３という。 BEST MODE FOR CARRYING OUT THE INVENTION The best mode for carrying out a method and apparatus for producing a hot-rolled steel sheet according to the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is an explanatory view showing a main part of a manufacturing apparatus 20 of the present embodiment for manufacturing a hot-rolled steel sheet. In FIG. 1, reference numeral 1 indicates a steel plate, reference numeral 2 indicates a part of the finishing rolling mill, reference numeral 3 indicates a conveyance table, reference numeral 4 indicates a winding device, and reference numeral 5 indicates n controllable elements. A water cooling device including a cooling header and a valve for adjusting the amount of water supplied to these cooling headers is shown. Reference numeral 7 denotes a winding thermometer, reference numeral 8 denotes an intermediate thermometer, and reference numeral 9 denotes a steel plate thickness measuring device. 10 is a steel plate speed measuring device, 11 is a steel plate temperature predicting device, 12 is a cooling control device for controlling the water amount adjusting valve, and is a result winding measured by a winding thermometer 7. It has a feedback control function that reduces the difference between the temperature and the target winding temperature. Hereinafter, the steel plate temperature prediction device 11 and the cooling control device 12 are collectively referred to as a controller 13.

水冷装置５は、鋼板１の搬送方向に合計ｎ個並設された冷却ヘッダーを有する。これらｎ個の冷却ヘッダーが並んだ１つの領域を冷却ゾーンという。水冷装置５は、搬送テーブル３を挟むように上下に設置された構造を有する。１つの冷却ヘッダー毎に水量調整バルブが設けられ、バルブの操作指令は冷却制御装置１２からバルブ操作指令分配装置１４を介して水冷装置５に伝達され、個々のバルブが制御される構造となっている。   The water cooling device 5 has a total of n cooling headers arranged in parallel in the conveying direction of the steel plate 1. One region where these n cooling headers are arranged is called a cooling zone. The water cooling device 5 has a structure installed up and down so as to sandwich the transfer table 3. A water amount adjusting valve is provided for each cooling header, and a valve operation command is transmitted from the cooling control device 12 to the water cooling device 5 via the valve operation command distribution device 14 so that each valve is controlled. Yes.

図２は、図１における制御コントローラ１３に含まれる第１の制御コントローラ１３ａ、第２の制御コントローラ１３ｂ及び第３の制御コントローラ１３ｃの信号の授受の状況を示す説明図である。   FIG. 2 is an explanatory diagram illustrating a state of signal transmission / reception of the first control controller 13a, the second control controller 13b, and the third control controller 13c included in the control controller 13 in FIG.

水冷装置５は、搬送テーブル３上に図１により示す基本構成の３基の水冷装置５ａ〜５ｃを有しており、３基の水冷装置５ａ〜５ｃの入側には、鋼板１の表面温度を測定可能な、仕上出口温度計６、第１の中間温度計８ｂ及び第２の中間温度計８ｃが設置される。   The water cooling device 5 has three water cooling devices 5a to 5c having the basic configuration shown in FIG. 1 on the transfer table 3, and the surface temperature of the steel plate 1 is on the entry side of the three water cooling devices 5a to 5c. A finish outlet thermometer 6, a first intermediate thermometer 8b, and a second intermediate thermometer 8c are installed.

図２は、第１の中間温度計８ｂ及び第２の中間温度計８ｃをいずれも鋼板１の上方に設置する場合を示すが、これに限定されるものではなく、鋼板１の下方に設置するようにしてもよい。   FIG. 2 shows a case where both the first intermediate thermometer 8b and the second intermediate thermometer 8c are installed above the steel plate 1, but the present invention is not limited to this, and is installed below the steel plate 1. You may do it.

また、第１の中間温度計８ｂ及び第２の中間温度計８ｃはいずれも水冷装置５ａ〜５ｃに近接して配置されることから、表面温度の測定の外乱要因となる鋼板１の上における冷却水の除去が困難な場合がある。このため、第１の中間温度計８ｂ及び第２の中間温度計８ｃとして、冷却水が飛散する環境においても測温可能なように、ノズルから噴射したパージ水を介して、水による減衰の少ない帯域（例えば０．９μｍ）の熱放射光を検出する放射温度計を設置することが望ましい。このような放射温度計を用いた鋼板表面温度測定装置としては、特開２００６−１７５８９号公報により開示された装置を例示することができる。この装置は、鋼板１に対向配置された放射温度計を備え、鋼板１の表面から放射された熱放射光を放射温度計で検出することにより鋼板１の表面温度を測定する装置であって、放射温度計で検出される熱放射光の光路が通る領域における光路安定領域と光路不安定領域との界面と放射温度計の光軸との交点を基準とした鋼板１のエッジ部の最小の拡がり角を７５℃以上に設定するものである。   In addition, since both the first intermediate thermometer 8b and the second intermediate thermometer 8c are arranged close to the water cooling devices 5a to 5c, the cooling on the steel plate 1 which becomes a disturbance factor in the measurement of the surface temperature. It may be difficult to remove water. Therefore, the first intermediate thermometer 8b and the second intermediate thermometer 8c are less attenuated by water through the purge water injected from the nozzle so that the temperature can be measured even in an environment where the cooling water is scattered. It is desirable to install a radiation thermometer that detects thermal radiation light in a band (for example, 0.9 μm). As a steel sheet surface temperature measuring device using such a radiation thermometer, the device disclosed by Unexamined-Japanese-Patent No. 2006-17589 can be illustrated. This device includes a radiation thermometer arranged opposite to the steel plate 1, and is a device for measuring the surface temperature of the steel plate 1 by detecting thermal radiation emitted from the surface of the steel plate 1 with a radiation thermometer, The minimum spread of the edge portion of the steel sheet 1 based on the intersection of the optical axis of the radiation thermometer with the interface between the optical path stable region and the optical path unstable region in the region through which the optical path of the thermal radiation detected by the radiation thermometer passes. The angle is set to 75 ° C. or higher.

さらに、水冷装置５が３つの水冷装置５ａ〜５ｃに分割される場合を示すが、これに限定されるものではなく、水冷装置５を、２つ又は４つ以上に分割するようにしてもよい。
制御コントローラ１３は、少なくもと１つの制御コントローラ（図２では第１の制御コントローラ１３ａ）が、入側温度計６から巻取温度計７までの区間に設置される全ての水冷装置（図２では水冷装置５ａ〜５ｃの３つ）を制御するように、構成される。 Furthermore, although the case where the water cooling device 5 is divided | segmented into the three water cooling devices 5a-5c is shown, it is not limited to this, You may make it divide the water cooling device 5 into 2 or 4 or more. .
The controller 13 includes at least one controller (the first controller 13a in FIG. 2) in all the water cooling devices (FIG. 2) installed in the section from the inlet side thermometer 6 to the winding thermometer 7. Then, it is comprised so that three of the water-cooling apparatuses 5a-5c) may be controlled.

第１の制御コントローラ１３ａから出力されるバルブ操作指令が、直接に水冷装置５ａ〜５ｃに伝達されるのではなく、バルブ操作指令分配装置１４で一旦集約され、各水冷装置５ａ〜５ｃに分配されて出力される。   The valve operation commands output from the first controller 13a are not directly transmitted to the water cooling devices 5a to 5c, but are once aggregated by the valve operation command distributor 14 and distributed to the water cooling devices 5a to 5c. Is output.

また、制御コントローラ１３は、少なくもと１つの制御コントローラ（図２では第２の制御コントローラ１３ｂ）が、入側温度計６から巻取温度計７までの区間に設置される１つ以上の水冷装置（図２では水冷装置５ｂ、５ｃの２つ）を制御するように、構成される。   Further, the controller 13 includes at least one water-cooling unit (second control controller 13b in FIG. 2) installed in the section from the inlet side thermometer 6 to the winding thermometer 7. It is configured to control the device (two of the water cooling devices 5b and 5c in FIG. 2).

第２の制御コントローラ１３ｂから出力されるバルブ操作指令が、直接に水冷装置５ｂ、５ｃに伝達されるのではなく、バルブ操作指令分配装置１４で一旦集約され、各水冷装置５ｂ、５ｃに分配されて出力される。   The valve operation commands output from the second controller 13b are not directly transmitted to the water cooling devices 5b and 5c, but are once aggregated by the valve operation command distributor 14 and distributed to the water cooling devices 5b and 5c. Is output.

さらに、制御コントローラ１３は、少なくもと１つの制御コントローラ（図２では第３の制御コントローラ１３ｃ）が、入側温度計６から巻取温度計７までの区間に設置される１つ以上の水冷装置（図２では水冷装置５ｃ）を制御するように、構成される。   Further, the controller 13 includes at least one water-cooling unit (3rd controller 13c in FIG. 2) installed in the section from the inlet side thermometer 6 to the winding thermometer 7. It is configured to control the device (water cooling device 5c in FIG. 2).

第３の制御コントローラ１３ｃから出力されるバルブ操作指令が、直接に水冷装置５ｃに伝達されるのではなく、バルブ操作指令分配装置１４で一旦集約され、各水冷装置５ｃに出力される。   The valve operation commands output from the third controller 13c are not directly transmitted to the water cooling device 5c, but are once aggregated by the valve operation command distributor 14 and output to each water cooling device 5c.

本実施の形態の熱延鋼板の製造装置０は以上のように構成される。つぎに、この製造装置１を用いて、熱間圧延の際における鋼板１の通過速度（圧延速度）を熱間圧延の途中で変更する操業を行う場合に、各水冷装置５ａ〜５ｃの全ての温度を、適切かつ迅速に修正して設定して、熱延鋼板を製造する状況を説明する。   The hot rolled steel sheet manufacturing apparatus 0 of the present embodiment is configured as described above. Next, when performing the operation which changes the passage speed (rolling speed) of the steel plate 1 in the case of hot rolling in the middle of hot rolling using this manufacturing apparatus 1, all of each water cooling apparatus 5a-5c. A situation in which a hot rolled steel sheet is manufactured by correcting and setting the temperature appropriately and quickly will be described.

図２に示すように、熱間圧延機１により所定の圧延速度で鋼板１の熱間圧延が行われている。ここで、熱間圧延における鋼板１の温度降下を防止するために圧延速度を上昇する加速圧延が行われるとし、この場合について説明する。   As shown in FIG. 2, hot rolling of the steel sheet 1 is performed by a hot rolling mill 1 at a predetermined rolling speed. Here, it is assumed that accelerated rolling is performed to increase the rolling speed in order to prevent the temperature drop of the steel sheet 1 during hot rolling, and this case will be described.

この場合、仕上圧延機２により圧延された鋼板１が仕上出口温度計６を通過する際、所定の周期（例えば０．４〜２．０秒周期）で仕上出口温度計６により鋼板１の温度が測定されるとともに、鋼板板厚測定装置９により鋼板１の板厚が測定される。また、この際に同時に鋼板１の表面にサンプリング点が設定される。   In this case, when the steel plate 1 rolled by the finish rolling mill 2 passes through the finish outlet thermometer 6, the temperature of the steel plate 1 is measured by the finish outlet thermometer 6 at a predetermined cycle (for example, a cycle of 0.4 to 2.0 seconds). Is measured, and the thickness of the steel plate 1 is measured by the steel plate thickness measuring device 9. At the same time, sampling points are set on the surface of the steel plate 1 at the same time.

第１の制御コントローラ１３ａの鋼板温度予測装置が、このサンプリング点の温度、板厚と、水冷装置５ａ、５ｂ、５ｃを通過する際の鋼板１の速度（変更後の圧延速度）と、鋼板１の比熱及び密度と、第１の水冷装置５ａ〜第３の水冷装置５ｃのうち個々の冷却ヘッダーのバルブ開度と、冷却水の水温と、気温とに基づいて、サンプリング点が巻取温度計７に到達する時の鋼板１の温度、すなわち巻取温度を予測する。巻取温度の予測方法を説明する。   The steel plate temperature prediction device of the first controller 13a is the temperature of the sampling point, the plate thickness, the speed of the steel plate 1 when passing through the water cooling devices 5a, 5b, 5c (the rolling speed after change), and the steel plate 1 The sampling point is a winding thermometer based on the specific heat and density of each of the above, the valve opening of each cooling header among the first water cooling device 5a to the third water cooling device 5c, the water temperature of the cooling water, and the air temperature. When the temperature reaches 7, the temperature of the steel sheet 1, that is, the coiling temperature is predicted. A method for predicting the coiling temperature will be described.

水冷装置５ａ〜５ｃの冷却ヘッダーから流出する冷却水により水冷されるゾーンについては、水冷による温度降下量ΔＴｗｉを水冷部温度降下予測式（４）式を用いて計算する。一方、これらのゾーンを除いた、大気のみにより冷却されるゾーンである空冷ゾーンについては、温度降下量ΔＴａｉを空冷部温度降下式（５）式を用いて計算し、仕上出口温度計６で測定した実績温度から全ゾーンの予測温度降下量を差し引くことにより、巻取温度の予測値を求める。 For zone being cooled by the cooling water flowing out from the cooling headers of the water-cooling bodies 5a to 5c device, the temperature drop .DELTA.Tw i by water cooling calculated using the water cooling unit temperature drop prediction equation (4) below. On the other hand, except for those zones for the air cooling zone is a zone which is cooled only by air, the amount of temperature drop .DELTA.Ta i calculated using air cooling unit temperature drop formula (5), at the finishing outlet thermometer 6 The predicted value of the coiling temperature is obtained by subtracting the predicted temperature drop of all zones from the measured actual temperature.

Figure 0004894686
Figure 0004894686

ここで、ｉ：ゾーンを表す添え字、ｎ：ゾーン数、Ｗ：水量密度（ｍ３／ｍ２ｈｒ）、Ｕ：バルブ開度（％）、αＬｉ：水冷部の熱伝達率（ｋｃａｌ／ｍ２ｈｒ℃）、ａ、ｂ：定数（−）、ｔｉ：ゾーン通過時間（ｈｒ）、Ｌｉ：ゾーン長さ（ｍ）、ｖｉ：鋼板の圧延速度（ｍ／ｓｅｃ）、ΔＴｗｉ：水冷部の温度降下量（℃）、ΔＴａｉ：空冷部の温度降下量（℃）、ｃ：比熱（ｋｃａｌ／ｋｇ℃）、ρ：密度（ｋｇ／ｍ３）、ｈ：板厚（ｍ）、Ｔｉ：各ゾーンの鋼板の温度（℃）、ＴＬ：水温（℃）、ＴＥ：気温（℃）、σ：ステファン・ボルツマン定数、ε：輻射率（−）、αＥｉ：空冷部の熱伝達率（ｋｃａｌ／ｍ２ｈｒ℃）、ＴＣ：巻取温度の予測値（℃）、ＴＦ：仕上出口温度（℃）である。 Here, i: subscript representing a zone, n: number of zones, W: water density (m 3 / m 2 hr), U: valve opening (%), α Li : heat transfer coefficient of water cooling part (kcal / m 2 hr ℃), a, b: constant (-), t i: zone passing time (hr), L i: zone length (m), v i: rolling speed of the steel sheet (m / sec), ΔTw i : Temperature drop in water-cooled part (° C), ΔTa i : temperature drop in air-cooled part (° C), c: specific heat (kcal / kg ° C), ρ: density (kg / m 3 ), h: plate thickness (m ), T i : Temperature of steel plate in each zone (° C.), T L : Water temperature (° C.), T E : Air temperature (° C.), σ: Stefan-Boltzmann constant, ε: Emissivity (−), α Ei : Air cooling Part heat transfer coefficient (kcal / m 2 hr ° C.), T C : predicted value of coiling temperature (° C.), T F : finishing outlet temperature (° C.).

巻取温度の予測値が巻取温度の目標値よりも高くなると予測される場合は、巻取温度の予測値が巻取温度の目標値に一致するまで、第１の制御コントローラ１３ａの冷却制御装置が以下のように第１の水冷装置５ａ、第２の水冷装置５ｂ及び第３の水冷装置５ｃのうち冷却ヘッダーのバルブ操作シミュレーションを行い、操作指令を算出し出力する。水冷装置５ａ〜５ｃのバルブ操作を行う順番は予め用意されている操作順序情報があり、これに従って操作する。   When the predicted value of the coiling temperature is predicted to be higher than the target value of the coiling temperature, the cooling control of the first controller 13a is performed until the predicted value of the coiling temperature matches the target value of the coiling temperature. The device performs a valve operation simulation of the cooling header among the first water cooling device 5a, the second water cooling device 5b, and the third water cooling device 5c as follows, and calculates and outputs an operation command. The order of performing the valve operation of the water cooling devices 5a to 5c includes operation order information prepared in advance, and the operation is performed according to this.

（ｉ）冷却水を流出中の冷却ヘッダーでバルブ開度が１００％になっていないバルブの開度を増やす。
（ｉｉ）冷却水を流出中の全ての冷却ヘッダーのバルブ開度が１００％であれば、冷却水を流出していない冷却ヘッダーの中で操作順序が最上位のバルブ開度を増やし、冷却を開始する。 (I) Increase the opening of the valve whose valve opening is not 100% in the cooling header that is flowing out the cooling water.
(Ii) If the valve openings of all the cooling headers that are flowing out of the cooling water are 100%, the valve opening having the highest operation order in the cooling header that is not flowing out of the cooling water is increased, and cooling is performed. Start.

巻取温度の予測値が巻取温度の目標値よりも低くなると予測される場合は、巻取温度の予測値が巻取温度の目標値に一致するまで以下のように冷却ヘッダーのバルブ操作シミュレーションを行い、操作指令を算出し出力する。   If the predicted value of the coiling temperature is predicted to be lower than the target value of the coiling temperature, the valve operation simulation of the cooling header is performed as follows until the predicted value of the coiling temperature matches the target value of the coiling temperature. To calculate and output an operation command.

（ｉ）冷却水を流出中の冷却ヘッダーでバルブ開度が１００％未満のバルブの開度を減らす。
（ｉｉ）冷却水を流出中の全ての冷却ヘッダーのバルブ開度が１００％であれば、この水冷装置の中でバルブ操作順序が最下位のバルブの開度を減らす。 (I) The opening degree of the valve whose valve opening is less than 100% is reduced in the cooling header that is flowing out the cooling water.
(Ii) If the valve opening degree of all the cooling headers flowing out of the cooling water is 100%, the opening degree of the lowest valve in the water cooling apparatus is reduced.

巻取温度の予測値が巻取温度の目標値と一致すると予測される場合はバルブ操作を行わず、巻取温度の予測に使用した時のバルブ開度をそのままバルブ操作指令として出力する。   When the predicted value of the coiling temperature is predicted to coincide with the target value of the coiling temperature, valve operation is not performed, and the valve opening when used for predicting the coiling temperature is output as it is as a valve operation command.

この時、巻取温度計７で測定した巻取温度の実績値と巻取温度の目標値との偏差を縮小するため、冷却制御装置のフィードバック制御機能によってバルブ操作指令を修正する。なお、フィードバック制御機能によって操作するバルブは操作可能なバルブの中で、最も巻取温度計７に近いバルブを操作する。   At this time, in order to reduce the deviation between the actual value of the coiling temperature measured by the coiling thermometer 7 and the target value of the coiling temperature, the valve operation command is corrected by the feedback control function of the cooling control device. The valve operated by the feedback control function operates the valve closest to the winding thermometer 7 among the operable valves.

このように、第１の制御コントローラ１３ａは、全ての水冷装置５ａ〜５ｃに対するバルブ操作指令を出力するが、第１の制御コントローラ１３ａから出力されるバルブ操作指令は、鋼板温度の予測装置が予測した巻取温度の予測誤差の分だけ不正確であるものの、全ての水冷装置５ａ〜５ｃが制御可能な状態で巻取温度を所定の温度に制御するためのバルブ操作指令を算出する。このため、熱間圧延の際における鋼板１の圧延速度を熱間圧延の途中で上昇する加速圧延を行う場合であっても、各水冷装置５ａ〜５ｃの全ての目標温度を、適切かつ迅速に修正して設定することができ、水冷装置５ａ〜５ｃの冷却能力を有効に利用した上で鋼板１のサンプリング点を所定の巻取温度に制御できる。   Thus, although the 1st controller 13a outputs the valve operation command with respect to all the water-cooling apparatuses 5a-5c, the prediction apparatus of a steel plate temperature estimates the valve operation command output from the 1st controller 13a. A valve operation command for controlling the winding temperature to a predetermined temperature is calculated in a state where all the water-cooling apparatuses 5a to 5c are controllable, although the amount is inaccurate due to the estimated temperature of the winding temperature. For this reason, even if it is a case where the accelerated rolling which raises the rolling speed of the steel plate 1 in the case of hot rolling is performed in the middle of hot rolling, all the target temperature of each water-cooling apparatus 5a-5c is appropriately and rapidly. The sampling point of the steel sheet 1 can be controlled to a predetermined coiling temperature after effectively using the cooling capacity of the water cooling devices 5a to 5c.

続いて、サンプリング点が巻取装置４へ向かって搬送テーブル３上を移動し、第１の中間温度計８ｂを通過する際、第２の制御コントローラ１３ｂの鋼板温度の予測装置がこのサンプリング点の第１の中間温度計８ｂで測定された温度と板厚、水冷装置５ａ〜５ｃを通過する鋼板１の通過速度（圧延速度）と、鋼板１の比熱及び密度と、第２の水冷装置５ｂ及び第３の水冷装置５ｃのうちの個々の冷却ヘッダーのバルブ開度と、冷却水の水温と、気温とを用い、サンプリング点が巻取温度計７に到達する時の巻取温度を予測する。巻取温度の予測方法は第１の制御コントローラ１３が行った方法と同じである。   Subsequently, when the sampling point moves on the transport table 3 toward the winding device 4 and passes through the first intermediate thermometer 8b, the steel plate temperature prediction device of the second controller 13b determines the sampling point. The temperature and thickness measured by the first intermediate thermometer 8b, the passing speed (rolling speed) of the steel plate 1 passing through the water cooling devices 5a to 5c, the specific heat and density of the steel plate 1, the second water cooling device 5b and The winding temperature when the sampling point reaches the winding thermometer 7 is predicted using the valve opening of each cooling header of the third water cooling device 5c, the water temperature of the cooling water, and the air temperature. The method for predicting the winding temperature is the same as the method performed by the first controller 13.

水冷装置５ａ〜５ｃのバルブ操作方法及び操作指令の出力方法もほぼ同じであるが、第２の制御コントローラ１３ｂがバルブ操作指令分配装置１４に第２の水冷装置５ｂ及び第３の水冷装置５ｃの２つの水冷装置に対するバルブ操作指令の出力を行う点が、相違する。   The valve operation methods and operation command output methods of the water cooling devices 5a to 5c are substantially the same, but the second controller 13b sends the valve operation command distribution device 14 to the second water cooling device 5b and the third water cooling device 5c. The difference is that a valve operation command is output to the two water cooling devices.

第２の制御コントローラ１３ｂは、第２の水冷装置５ｂ及び第３の水冷装置５ｃに対するバルブ操作指令を出力するが、このバルブ操作指令は、第１の制御コントローラ１３ａで出力したバルブ操作指令よりも温度予測区間が短く巻取温度の予測誤差が小さくなるため、鋼板１の上のサンプリング点をより高精度に所定の巻取温度に制御できる。   The second controller 13b outputs a valve operation command for the second water cooling device 5b and the third water cooling device 5c. The valve operation command is more than the valve operation command output by the first controller 13a. Since the temperature prediction section is short and the prediction error of the coiling temperature is small, the sampling point on the steel plate 1 can be controlled to a predetermined coiling temperature with higher accuracy.

第１の制御コントローラ１３ａが出力した第２の水冷装置５ｂ及び第３の水冷装置５ｃに対するバルブ操作指令と、第２の制御コントローラ１３ｂが出力した操作指令とは、同じバルブ操作順序に従って設定されるため、操作指令の差異は巻取温度の制御精度をより向上させるための修正分である。   The valve operation commands for the second water cooling device 5b and the third water cooling device 5c output by the first controller 13a and the operation commands output by the second controller 13b are set according to the same valve operation sequence. For this reason, the difference in the operation command is a correction for further improving the control accuracy of the coiling temperature.

さらに、サンプリング点が巻取装置４へ向かって搬送テーブル３上を移動し、第２の中間温度計８ｃを通過する際に、第３の制御コントローラ１３ｃの鋼板温度予測装置がこのサンプリング点の第２の中間温度計８ｃで測定された温度と、鋼板１の板厚及び第３の水冷装置５ｃを通過する速度と、鋼板１の比熱及び密度と、第３の水冷装置５ｃ内の個々の冷却ヘッダーのバルブ開度と、冷却水の水温と、気温とに基づいて、サンプリング点が巻取温度計７に到達する時の鋼板１の温度、すなわち巻取温度を予測する。巻取温度の予測方法は、第１の制御コントローラ１３ａが行った方法と同じである。   Further, when the sampling point moves on the transport table 3 toward the winding device 4 and passes through the second intermediate thermometer 8c, the steel plate temperature prediction device of the third controller 13c is the first sampling point. 2, the temperature measured by the intermediate thermometer 8c, the plate thickness of the steel plate 1 and the speed of passing through the third water cooling device 5c, the specific heat and density of the steel plate 1, and the individual cooling in the third water cooling device 5c. Based on the valve opening of the header, the coolant temperature, and the air temperature, the temperature of the steel sheet 1 when the sampling point reaches the winding thermometer 7, that is, the winding temperature, is predicted. The method for predicting the coiling temperature is the same as the method performed by the first controller 13a.

第３の水冷装置５ｃのバルブ操作方法及び操作指令の出力方法もほぼ同じであるが、第３の制御コントローラ１３ｃがバルブ操作指令分配装置１４に第３の水冷装置５ｃだけに対するバルブ操作指令の出力を行う点が相違する。   The valve operation method and operation command output method of the third water cooling device 5c are substantially the same, but the third controller 13c outputs the valve operation command to the valve operation command distribution device 14 only for the third water cooling device 5c. Is different.

第３の制御コントローラ１３ｃは、第３の水冷装置５ｃに対するバルブ操作指令を出力するが、このバルブ操作指令は、第２の制御コントローラ１３ｂで出力したバルブ操作指令よりも温度予測区間が短く巻取温度予測誤差が小さくなるため、鋼板上のサンプリング点をより高精度に所定の巻取温度に制御できる。   The third controller 13c outputs a valve operation command for the third water cooling device 5c, and this valve operation command has a shorter temperature prediction interval than the valve operation command output by the second controller 13b. Since the temperature prediction error is reduced, the sampling point on the steel plate can be controlled to a predetermined winding temperature with higher accuracy.

なお、第２の制御コントローラ１３ｂが出力した第３の水冷装置５ｃに対するバルブ操作指令と第３の制御コントローラ１３ｃが出力した操作指令とは、同じバルブ操作順序に従って設定されているため、操作指令の差異は巻取温度の制御精度をより向上させるための修正分である。   In addition, since the valve operation command with respect to the 3rd water cooling apparatus 5c which the 2nd controller 13b output, and the operation command which the 3rd controller 13c output are set according to the same valve operation sequence, operation command The difference is a correction for further improving the control accuracy of the coiling temperature.

このように、第１の制御コントローラ１３ａは第１の水冷装置５ａ、第２の水冷装置５ｂ及び第３の水冷装置５ｃのバルブ操作指令をバルブ操作指令分配装置１４に出力し、第２の制御コントローラ１３ｂは第２の水冷装置５ｂ及び第３の水冷装置５ｃのバルブ操作指令をバルブ操作指令分配装置１４に出力し、さらに、第３の制御コントローラ１３ｃは第３の水冷装置５ｃのバルブ操作指令をバルブ操作指令分配装置１４に出力する。   In this way, the first controller 13a outputs the valve operation commands of the first water cooling device 5a, the second water cooling device 5b, and the third water cooling device 5c to the valve operation command distribution device 14, and the second control. The controller 13b outputs the valve operation commands of the second water cooling device 5b and the third water cooling device 5c to the valve operation command distribution device 14, and the third control controller 13c further outputs the valve operation commands of the third water cooling device 5c. Is output to the valve operation command distributor 14.

以上のように、先ず、第１の制御コントローラ１３ａが巻取温度を所定の温度に制御するためのベースとなるバルブ操作指令を出力する。このバルブ操作指令は巻取温度計７までの温度予測区間が長いため、巻取温度の予測誤差が大きく制御精度の面では不利であるものの、仕上出口温度計６から巻取温度計７までの間に存在する全ての水冷装置５ａ〜５ｃが操作対象となるため、水冷装置５ａ〜５ｃが有する冷却能力を有効に利用して、巻取り温度が目標温度から外れることを防止できる。   As described above, first, the first controller 13a outputs a valve operation command as a base for controlling the winding temperature to a predetermined temperature. Although this valve operation command has a long temperature prediction interval to the winding thermometer 7, the prediction error of the winding temperature is large, which is disadvantageous in terms of control accuracy, but from the finishing outlet thermometer 6 to the winding thermometer 7 Since all the water cooling devices 5a to 5c existing in between are the operation targets, it is possible to prevent the winding temperature from deviating from the target temperature by effectively using the cooling capacity of the water cooling devices 5a to 5c.

そして、第２の制御コントローラ１３ｂが巻取温度を所定の温度に制御するためのバルブ操作指令は、第１の中間温度計１８ｂで測定した実績温度を用いており、巻取温度計７までの温度予測区間が短くなるため、相対的に巻取温度の予測誤差が小さくなるため制御精度の向上が期待でき、第１の制御コントローラ１３ａが出力した操作指令を巻取温度制御精度が向上するように修正することできる。   The valve operation command for the second controller 13b to control the winding temperature to a predetermined temperature uses the actual temperature measured by the first intermediate thermometer 18b. Since the temperature prediction section is shortened, the prediction error of the coiling temperature is relatively small, so that the control accuracy can be expected to be improved, and the operation command output by the first controller 13a is improved in the coiling temperature control accuracy. Can be modified.

さらに、第３の制御コントローラ１３ｃが巻取温度を所定の温度に制御するためのバルブ操作指令は、第２の中間温度計８ｃで測定した実績温度を用いており、巻取温度計までの温度予測区間がさらに短く、巻取温度の予測誤差が小さいため最も制御精度の向上が期待でき、第２の制御コントローラ１３ｂが出力した操作指令を巻取温度の制御精度が向上するようにさらに修正することができる。   Further, the valve operation command for the third controller 13c to control the winding temperature to a predetermined temperature uses the actual temperature measured by the second intermediate thermometer 8c, and the temperature up to the winding thermometer. Since the prediction interval is shorter and the prediction error of the coiling temperature is small, the highest control accuracy can be expected, and the operation command output by the second controller 13b is further modified so that the control accuracy of the coiling temperature is improved. be able to.

これら、複数の制御コントローラ１３ａ〜１３ｃが出力するバルブ操作指令を前述の分配方法で水冷装置５ａ〜５ｃに出力し、鋼板１を冷却することにより、全ての水冷装置５ａ〜５ｃの冷却能力を有効に利用することができるとともに、巻取温度の制御精度を向上させることができる。   The cooling operation of all the water cooling devices 5a to 5c is made effective by outputting the valve operation commands output from the plurality of control controllers 13a to 13c to the water cooling devices 5a to 5c by the above-described distribution method and cooling the steel plate 1. And the control accuracy of the coiling temperature can be improved.

上述したように、図８に示した、１つの水冷装置５を１つの制御コントローラ１３で制御する発明や、図９に示した、複数の水冷装置５をこれらの水冷装置と一対一の関係で対応する同じ数の制御コントローラ１３により制御し、１つの制御コントローラの制御区間と１つの水冷装置が一対一に対応し、個々の制御コントローラが、それぞれの目標値に制御する発明は、いずれも本願出願前に公知である。   As described above, the invention in which one water cooling device 5 shown in FIG. 8 is controlled by one controller 13 and the plurality of water cooling devices 5 shown in FIG. 9 are in a one-to-one relationship with these water cooling devices. The invention is controlled by the same number of corresponding controller 13 and the control section of one controller and one water cooling device correspond one-to-one, and each control controller controls each target value. Known before filing.

これに対し、本発明は、水冷装置と同じ数（２個以上）の制御コントローラを備える点では形式的に図９の発明と共通するが、図２に示すように、全ての制御コントローラの制御区間は、水冷装置の入側温度計から巻取温度計までの区間としたことが特徴となっている。   On the other hand, the present invention is formally common with the invention of FIG. 9 in that it includes the same number (two or more) of controller as the water cooling device, but as shown in FIG. The section is characterized by the section from the inlet side thermometer of the water cooling device to the winding thermometer.

この構造により、少なくとも１つの制御コントローラ（図２における第１の制御コントローラ１３ａ）は全ての水冷装置５ａ〜５ｃを制御対象としてバルブ操作指令を出力するため、全ての水冷装置５ａ〜５ｃの冷却能力を有効に利用することができる。加えて、短い制御区間に対応する制御コントローラ（図２における第３の制御コントローラ１３ｃ）が巻取温度の制御精度を向上させる。そして、中間に位置する制御コントローラ（図２における第２の制御コントローラ１３ｂ）は冷却能力の有効利用と制御精度の向上の中間的な役割を持つ。   With this structure, at least one controller (first controller 13a in FIG. 2) outputs a valve operation command with all the water cooling devices 5a to 5c as control targets, so that the cooling capacity of all the water cooling devices 5a to 5c is Can be used effectively. In addition, a control controller (third control controller 13c in FIG. 2) corresponding to a short control section improves the control accuracy of the coiling temperature. The control controller located in the middle (second control controller 13b in FIG. 2) has an intermediate role of effectively using the cooling capacity and improving the control accuracy.

各制御コントローラ１３ａ〜１３ｃが各水冷装置５ａ〜５ｃに出力するバルブ操作指令が重なる部分があるが、これをバルブ操作指令分配装置１４が適切に分配することにより、水冷装置５ａ〜５ｃの冷却能力を有効に利用しながら、巻取温度の制御精度を向上することができる。   Although there is a portion where valve operation commands output from the respective controller 13a to 13c to the respective water cooling devices 5a to 5c overlap, the valve operation command distribution device 14 appropriately distributes this so that the cooling capacity of the water cooling devices 5a to 5c is obtained. It is possible to improve the control accuracy of the coiling temperature while effectively using.

なお、以上の実施の形態の説明では、熱間圧延の途中で変更される熱間圧延条件が熱間圧延の圧延速度である態様を例にとった。しかし、本発明はこの態様に限定されるものではなく、熱間圧延条件が、熱間圧延機のうちの仕上圧延機の出側における鋼板の温度又は板厚である場合についても同様に適用される。上述したように、熱延鋼板の実際の製造では、仕上げ圧延機の出側における鋼板の温度や板厚が何らかの原因により、設定値から外れることがある。   In the description of the above embodiment, an example in which the hot rolling condition changed during the hot rolling is the rolling speed of the hot rolling is taken as an example. However, the present invention is not limited to this embodiment, and the present invention is similarly applied to the case where the hot rolling condition is the temperature or thickness of the steel plate on the exit side of the finishing mill of the hot rolling mills. The As described above, in the actual manufacture of a hot-rolled steel sheet, the temperature and thickness of the steel sheet on the exit side of the finish rolling mill may deviate from the set value due to some cause.

このような場合には、仕上げ圧延機の出側における鋼板の温度や板厚の変動値と、複数の水冷装置のうちの最上流側に位置する水冷装置の入側における鋼板の温度の測定値とに基づいて、鋼板の巻取温度を目標値とすることが可能な、複数の水冷装置全てについての冷却条件の設定値を求め、さらに、上述した変動値と、複数の水冷装置のうちで最も上流側に位置する水冷装置以外の１又は２以上の水冷装置の入側における鋼板の温度の測定値とに基づいて、少なくとも１又は２以上の水冷装置について求めた冷却条件の設定値を修正して設定するようにすればよい。これにより、仕上げ圧延機の出側における鋼板の温度や板厚が変動した場合にも、各水冷装置の全ての目標温度を、適切かつ迅速に修正して設定することができ、これにより、鋼板の巻取温度を目標温度に正確に制御することができる。   In such a case, the measured values of the temperature and thickness of the steel sheet on the exit side of the finish rolling mill and the temperature of the steel sheet on the inlet side of the water cooling apparatus located on the most upstream side of the plurality of water cooling apparatuses. Based on the above, the setting value of the cooling condition for all of the plurality of water cooling devices capable of setting the coiling temperature of the steel sheet as a target value is obtained, and further, among the above-described fluctuation values and the plurality of water cooling devices. Corrected the set value of the cooling condition obtained for at least one or two or more water cooling devices based on the measured value of the temperature of the steel plate on the inlet side of one or more water cooling devices other than the water cooling device located on the most upstream side And set it. As a result, even when the temperature and thickness of the steel sheet on the exit side of the finish rolling mill fluctuate, all target temperatures of each water cooling device can be appropriately and quickly corrected and set. The coiling temperature can be accurately controlled to the target temperature.

本発明を、実施例を参照しながらさらに具体的に説明する。
図３は、本実施例の熱延鋼板の製造装置の全体構成を模式的に示す説明図である。
搬送テーブル３上に、図２に示す基本構成を有する水冷装置５ａ〜５ｃが３基設けられており、３つの水冷装置５ａ〜５ｃの入側には、鋼板１の表面温度を測定することができる仕上出口温度計６、第１の中間温度計８ｂ及び第２の中間温度計８ｃが設置されている。 The present invention will be described more specifically with reference to examples.
Drawing 3 is an explanatory view showing typically the whole composition of the manufacture device of the hot rolled sheet steel of this example.
Three water-cooling devices 5a to 5c having the basic configuration shown in FIG. 2 are provided on the transfer table 3, and the surface temperature of the steel sheet 1 can be measured on the entry side of the three water-cooling devices 5a to 5c. A finishing exit thermometer 6, a first intermediate thermometer 8 b and a second intermediate thermometer 8 c are installed.

水冷装置５ａ、５ｂには、水パージ及びエアパージを行い、飛散する冷却水を除去するのに十分な間隙があるため、第１の中間温度計８ｂは、これらの対策を施した上で通常の放射温度計を設置している。一方、水冷装置５ｂ、５ｃには十分な間隙がなく、冷却水の除去対策を充分に行うことができないため、第２の中間温度計８ｃとして冷却水が飛散する環境においても測温可能な温度計を設置した。なお、この中間温度計８ｃの構造上、鋼板１の下面側に設置している。   The water cooling devices 5a and 5b have a gap sufficient to perform water purge and air purge and remove the scattered cooling water. Therefore, the first intermediate thermometer 8b takes ordinary measures after taking these measures. A radiation thermometer is installed. On the other hand, since the water cooling devices 5b and 5c do not have a sufficient gap and cannot sufficiently take measures for removing the cooling water, the temperature that can be measured even in the environment where the cooling water scatters as the second intermediate thermometer 8c. A total was installed. The intermediate thermometer 8c is installed on the lower surface side of the steel plate 1 due to the structure of the intermediate thermometer 8c.

制御コントローラ１３ａ〜１３ｃは水冷装置５ａ〜５ｃと同数設けられており、少なくとも１つの制御コントローラ１３ａは、入側温度計６から巻取温度計７までの区間に設置される１つ以上の水冷装置５ａ〜５ｃを制御する。   The number of control controllers 13a to 13c is the same as that of the water cooling devices 5a to 5c, and at least one control controller 13a is one or more water cooling devices installed in the section from the inlet side thermometer 6 to the winding thermometer 7. Control 5a-5c.

図３に示す製造装置を用いて、下記の条件で熱延鋼板を製造した。
鋼種 ：４４０ＭＰａ級高強度熱延鋼板
板厚 ：３．５ｍｍ
目標巻取温度 ：５００℃
鋼板速度 ：５７０ｍｐｍ→６５０ｍｐｍ（加速圧延）
第１の水冷装置５ａの長さ：３２ｍ
第２の水冷装置５ｂの長さ：４０ｍ
第３の水冷装置５ｃの長さ：４０ｍ
水冷装置５ａの水量密度 ：１．１ｍ３／ｍ２ｈｒ（上面）、０．８ｍ３／ｍ２ｈｒ（下面）
共にバルブ開度１００％時
水冷装置５ｂの水量密度 ：０．６ｍ３／ｍ２ｈｒ（上面）、０．５ｍ３／ｍ２ｈｒ（下面）
共にバルブ開度１００％時
水冷装置５ｃの水量密度 ：０．６ｍ３／ｍ２ｈｒ（上面）、０．５ｍ３／ｍ２ｈｒ（下面）
共にバルブ開度１００％時
水冷装置５ａのバルブ数 ：７８個
水冷装置５ｂのバルブ数 ：４５個
水冷装置５ｃのバルブ数 ：８２個 A hot-rolled steel sheet was manufactured under the following conditions using the manufacturing apparatus shown in FIG.
Steel type: 440 MPa class high strength hot-rolled steel sheet Thickness: 3.5 mm
Target winding temperature: 500 ° C
Steel plate speed: 570 mpm → 650 mpm (accelerated rolling)
The length of the first water cooling device 5a: 32 m
The length of the second water cooling device 5b: 40 m
Length of third water cooling device 5c: 40m
Water density of water cooling device 5a: 1.1 m 3 / m 2 hr (upper surface), 0.8 m 3 / m 2 hr (lower surface)
In both cases, the water density of the water cooling device 5b when the valve opening is 100%: 0.6 m 3 / m 2 hr (upper surface), 0.5 m 3 / m 2 hr (lower surface)
In both cases, the water density of the water cooling device 5c when the valve opening degree is 100%: 0.6 m 3 / m 2 hr (upper surface), 0.5 m 3 / m 2 hr (lower surface)
When the valve opening degree is 100%, the number of valves of the water cooling device 5a: 78 The number of valves of the water cooling device 5b: 45 The number of valves of the water cooling device 5c: 82

図４は、図９の冷却制御装置により冷却制御を行った比較例の冷却制御の結果である、鋼板１の長手方向の仕上出口温度実績値、第１の中間温度計８ｂの測定値及び第２の中間温度計８ｃの測定値と、巻取温度実績値とを示すグラフである。   FIG. 4 is a result of the cooling control of the comparative example in which the cooling control is performed by the cooling control device of FIG. 9, the actual finishing outlet temperature value in the longitudinal direction of the steel plate 1, the measured value of the first intermediate thermometer 8 b, It is a graph which shows the measured value of the intermediate | middle thermometer 8c of No. 2, and winding temperature actual value.

図４のグラフに示すように、中間温度１の目標値は７００℃とし、中間温度２の目標値は５６０℃とした。中間温度１に関しては目標通りに制御できたものの、中間温度２及び巻取温度は、いずれも、水冷装置の冷却能力の上限に達して飽和したため、目標温度よりも３０〜４０℃高く外れている。   As shown in the graph of FIG. 4, the target value of the intermediate temperature 1 was 700 ° C., and the target value of the intermediate temperature 2 was 560 ° C. Although the intermediate temperature 1 could be controlled according to the target, both the intermediate temperature 2 and the coiling temperature reached the upper limit of the cooling capacity of the water cooling device and were saturated, and thus deviated 30 to 40 ° C. higher than the target temperature. .

一方、図５は、図３に示す第１の制御コントローラ１３ａ、第２の制御コントローラ１３ｂ及び第３の制御コントローラ１３ｃを使用して冷却制御を行った本発明例の冷却制御の結果である、鋼板１の長手方向の仕上出口温度実績値、第１の中間温度計８ｂの測定値及び第２の中間温度計８ｃの測定値と、巻取温度実績値とを示すグラフである。   On the other hand, FIG. 5 is a result of the cooling control of the present invention example in which the cooling control is performed using the first controller 13a, the second controller 13b, and the third controller 13c shown in FIG. It is a graph which shows the finishing outlet temperature actual value of the longitudinal direction of the steel plate 1, the measured value of the 1st intermediate thermometer 8b, the measured value of the 2nd intermediate thermometer 8c, and the winding temperature actual value.

図５に示すように、実績巻取温度は目標の５００℃付近に制御されており、目標±１５℃以内に制御されている。   As shown in FIG. 5, the actual winding temperature is controlled in the vicinity of the target 500 ° C., and is controlled within the target ± 15 ° C.

実施例１は、仕上圧延速度が圧延の途中で変化した場合の効果を示したものであったが、本実施例では、仕上圧延機の出側温度が変化した場合について説明する。
本実施例の熱延鋼板の製造装置は実施例１と全く同じものであり、この製造装置を用いて下記条件で熱延鋼板を製造した。 Example 1 showed the effect when the finish rolling speed was changed during rolling, but in this example, the case where the exit temperature of the finish rolling machine is changed will be described.
The manufacturing apparatus of the hot-rolled steel sheet of this example is exactly the same as that of Example 1, and a hot-rolled steel sheet was manufactured under the following conditions using this manufacturing apparatus.

鋼種 ：２９０ＭＰａ級熱延鋼板
板厚 ：４．３ｍｍ
目標巻取温度 ：６００℃
鋼板速度 ：６２０ｍｐｍ（加速なし）
第１の水冷装置５ａの長さ：３２ｍ
第２の水冷装置５ｂの長さ：４０ｍ
第３の水冷装置５ｃの長さ：４０ｍ
水冷装置５ａの水量密度 ：１．１ｍ３／ｍ２ｈｒ（上面）、０．８ｍ３／ｍ２ｈｒ（下面）
共にバルブ開度１００％時
水冷装置５ｂの水量密度 ：０．６ｍ３／ｍ２ｈｒ（上面）、０．５ｍ３／ｍ２ｈｒ（下面）
共にバルブ開度１００％時
水冷装置５ｃの水量密度 ：０．６ｍ３／ｍ２ｈｒ（上面）、０．５ｍ３／ｍ２ｈｒ（下面）
共にバルブ開度１００％時
水冷装置５ａのバルブ数 ：７８個
水冷装置５ｂのバルブ数 ：４５個
水冷装置５ｃのバルブ数 ：８２個 Steel type: 290 MPa class hot-rolled steel sheet thickness: 4.3 mm
Target winding temperature: 600 ° C
Steel plate speed: 620 mpm (no acceleration)
The length of the first water cooling device 5a: 32 m
The length of the second water cooling device 5b: 40 m
Length of third water cooling device 5c: 40m
Water density of water cooling device 5a: 1.1 m 3 / m 2 hr (upper surface), 0.8 m 3 / m 2 hr (lower surface)
In both cases, the water density of the water cooling device 5b when the valve opening is 100%: 0.6 m 3 / m 2 hr (upper surface), 0.5 m 3 / m 2 hr (lower surface)
In both cases, the water density of the water cooling device 5c when the valve opening degree is 100%: 0.6 m 3 / m 2 hr (upper surface), 0.5 m 3 / m 2 hr (lower surface)
When the valve opening degree is 100%, the number of valves of the water cooling device 5a: 78 The number of valves of the water cooling device 5b: 45 The number of valves of the water cooling device 5c: 82

図６は、図９の冷却制御装置により冷却制御を行った比較例の冷却制御の結果である、鋼板１の長手方向の仕上出口温度実績値、第１の中間温度計８ｂの測定値及び第２の中間温度計８ｃの測定値と、巻取温度実績値とを示すグラフである。   FIG. 6 is a result of the cooling control of the comparative example in which the cooling control is performed by the cooling control device of FIG. 9, and the actual finishing outlet temperature value in the longitudinal direction of the steel plate 1, the measured value of the first intermediate thermometer 8b, and the first It is a graph which shows the measured value of the intermediate | middle thermometer 8c of No. 2, and winding temperature actual value.

図６のグラフに示すように、中間温度１の目標値は７８０℃とし、中間温度２の目標値は７１０℃とした。中間温度１に関しては鋼板の長手方向中央部以降の仕上出口温度が高温の部分で水冷装置５ａの冷却能力の上限に達して飽和したため、目標よりも３０℃程度高く外れている。そして、中間温度２では水冷装置５ｂが冷却能力上限に達することなく、目標通りに制御できたが、巻取温度は水冷装置５ｃが冷却能力の上限に達したため、目標温度よりも２０〜３０℃高く外れている。   As shown in the graph of FIG. 6, the target value of the intermediate temperature 1 was 780 ° C., and the target value of the intermediate temperature 2 was 710 ° C. With respect to the intermediate temperature 1, the finishing outlet temperature after the central portion in the longitudinal direction of the steel sheet reaches the upper limit of the cooling capacity of the water cooling device 5a at a high temperature portion and is saturated. And at the intermediate temperature 2, the water cooling device 5b could be controlled according to the target without reaching the upper limit of the cooling capacity, but the winding temperature was 20-30 ° C. higher than the target temperature because the water cooling device 5c reached the upper limit of the cooling capacity. Highly off.

一方、図７は、図３に示す第１の制御コントローラ１３ａ、第２の制御コントローラ１３ｂ及び第３の制御コントローラ１３ｃを使用して冷却制御を行った本発明例の冷却制御の結果である、鋼板１の長手方向の仕上出口温度実績値、第１の中間温度計８ｂの測定値及び第２の中間温度計８ｃの測定値と、巻取温度実績値とを示すグラフである。   On the other hand, FIG. 7 is a result of the cooling control of the present invention example in which the cooling control is performed using the first controller 13a, the second controller 13b, and the third controller 13c shown in FIG. It is a graph which shows the finishing outlet temperature actual value of the longitudinal direction of the steel plate 1, the measured value of the 1st intermediate thermometer 8b, the measured value of the 2nd intermediate thermometer 8c, and the winding temperature actual value.

図７にその制御結果を示すが、中間温度１は水冷装置５ａが冷却能力上限に達して飽和したため、図６と同様の温度になっているが、冷却能力に余力のある水冷装置５ｂを有効に使用することにより、実績巻取温度を目標の６００℃付近に制御することができた。   FIG. 7 shows the control result. The intermediate temperature 1 is the same as that in FIG. 6 because the water cooling device 5a reaches the upper limit of the cooling capacity and is saturated, but the water cooling device 5b having sufficient cooling capacity is effective. By using this, the actual winding temperature could be controlled around the target 600 ° C.

熱延鋼板を製造する本実施の形態の製造装置の要部を示す説明図である。It is explanatory drawing which shows the principal part of the manufacturing apparatus of this Embodiment which manufactures a hot-rolled steel plate. 図１における制御コントローラに含まれる第１の制御コントローラ、第２の制御コントローラ及び第３の制御コントローラの信号の授受の状況を示す説明図である。It is explanatory drawing which shows the condition of transmission / reception of the signal of the 1st control controller contained in the control controller in FIG. 1, a 2nd control controller, and a 3rd control controller. 実施例の熱延鋼板の製造装置の構成を示す説明図である。It is explanatory drawing which shows the structure of the manufacturing apparatus of the hot rolled sheet steel of an Example. 実施例１における比較例の結果を示すグラフである。6 is a graph showing the results of a comparative example in Example 1. 実施例１における本発明例の結果を示すグラフである。3 is a graph showing the results of an example of the present invention in Example 1. 実施例２における比較例の結果を示すグラフである。6 is a graph showing the results of a comparative example in Example 2. 実施例２における本発明例の結果を示すグラフである。6 is a graph showing the results of an example of the present invention in Example 2. 従来の熱延鋼板の製造装置の一例を模式的に示す説明図である。It is explanatory drawing which shows typically an example of the manufacturing apparatus of the conventional hot-rolled steel plate. 従来の熱延鋼板の製造装置の一例を模式的に示す説明図である。It is explanatory drawing which shows typically an example of the manufacturing apparatus of the conventional hot-rolled steel plate. 水冷装置により冷却される鋼板の温度の一例を経時的に示すグラフである。It is a graph which shows an example of the temperature of the steel plate cooled with a water cooling device over time.

符号の説明Explanation of symbols

０、２０ 熱延鋼板の製造装置
１ 鋼板
２ 仕上圧延機
３ 搬送テーブル
４ 巻取装置
５、５ａ〜５ｃ 水冷装置
６ 仕上出口温度計
７ 巻取温度計
８、８ｂ、８ｃ 中間温度計
９ 鋼板板厚測定装置
１０ 鋼板速度測定装置
１１ 鋼板温度予測装置
１２ 冷却制御装置
１３、１３ａ〜１３ｃ 制御コントローラ
１４ バルブ操作指令分配装置 0, 20 Manufacturing apparatus for hot-rolled steel sheet 1 Steel sheet 2 Finishing rolling mill 3 Conveying table 4 Winding device 5, 5a-5c Water cooling device 6 Finishing exit thermometer 7 Winding thermometers 8, 8b, 8c Intermediate thermometer 9 Steel plate Thickness measurement device 10 Steel plate speed measurement device 11 Steel plate temperature prediction device 12 Cooling control device 13, 13a-13c Control controller 14 Valve operation command distribution device

Claims (5)

熱間圧延機により熱間圧延を行われてから搬送テーブルにより搬送される鋼板へ向けて、該鋼板の搬送方向へ向けて並設された複数基の水冷装置それぞれから、予め定められた熱間圧延条件に基づいて鋼板の巻取温度を演算により予測することにより予め定められる冷却条件で冷却水を噴射することによって該鋼板を冷却した後に、巻取機によりコイルに巻き取って熱延鋼板を製造する際に、
前記熱間圧延の途中で、前記予め定められた熱間圧延条件とは異なる他の熱間圧延条件に変更して該熱間圧延を引き続き行う場合に、
前記他の熱間圧延条件と、複数の前記水冷装置のうちの最上流側に位置する水冷装置の入側における鋼板の温度の測定値とに基づいて、前記鋼板の巻取温度を目標値とすることが可能な、複数の前記水冷装置全てについての冷却条件の設定値を求め、さらに
前記他の熱間圧延条件と、複数の前記水冷装置のうちで最も上流側に位置する水冷装置以外の１又は２以上の水冷装置の入側における鋼板の温度の測定値とに基づいて、少なくとも前記１又は２以上の水冷装置について求めた前記冷却条件の設定値を修正して設定すること、及び
前記水冷装置は、開度が独立して制御可能であって噴射する前記冷却水の水量を調整する複数の水量調整バルブを有するとともに、前記冷却条件は、該水量調整バルブの開度であること
を特徴とする熱延鋼板の製造方法。 From the plurality of water cooling devices arranged in parallel in the transport direction of the steel sheet to the steel sheet transported by the transport table after hot rolling by a hot rolling mill, a predetermined hot After cooling the steel sheet by injecting cooling water under a predetermined cooling condition by predicting the coiling temperature of the steel sheet by calculation based on the rolling conditions, the coil is wound around a coil by a winder. When manufacturing
In the middle of the hot rolling, when the hot rolling is continued by changing to other hot rolling conditions different from the predetermined hot rolling conditions,
Based on the other hot rolling conditions and the measured value of the temperature of the steel plate on the inlet side of the water cooling device located on the most upstream side of the plurality of water cooling devices, the coiling temperature of the steel plate is set as the target value. It is possible to obtain a set value of cooling conditions for all of the plurality of water cooling devices, and other than the other hot rolling conditions and the water cooling device located on the most upstream side among the plurality of water cooling devices Correcting and setting the set value of the cooling condition obtained for at least the one or more water cooling devices based on the measured value of the temperature of the steel sheet on the entry side of the one or more water cooling devices ; and
The water cooling device has a plurality of water amount adjustment valves that can independently control the opening degree and adjust the amount of the cooling water to be injected, and the cooling condition is the opening degree of the water amount adjustment valve. <br/> A method for producing a hot-rolled steel sheet characterized by the above. 前記熱間圧延条件は、前記熱間圧延の圧延速度、若しくは、前記熱間圧延機のうちの仕上圧延機の出側における前記鋼板の温度である請求項１に記載された熱延鋼板の製造方法。   The hot-rolled steel sheet manufacturing method according to claim 1, wherein the hot-rolling condition is a rolling speed of the hot-rolling or a temperature of the steel sheet on the exit side of a finishing mill of the hot-rolling mill. Method. 前記鋼板の温度の測定値は、水による減衰の少ない１．１μｍ以下の帯域の熱放射光を検出して放射温度計測を行うことにより、前記冷却水が飛散する環境においても測温可能な温度計による測定値である請求項１又は請求項２に記載された熱延鋼板の製造方法。 The measured value of the temperature of the steel sheet is a temperature that can be measured even in an environment where the cooling water is scattered by detecting thermal radiation in a band of 1.1 μm or less, which is less attenuated by water, and performing radiation temperature measurement. The method for producing a hot-rolled steel sheet according to claim 1 or 2 , which is a value measured by a meter. 前記巻取温度の測定値と目標値の偏差が減少するように前記水冷装置をフィードバック制御する請求項１から請求項３までのいずれか１項に記載された熱延鋼板の製造方法。 The method for producing a hot-rolled steel sheet according to any one of claims 1 to 3 , wherein the water cooling device is feedback-controlled so that a deviation between the measured value of the coiling temperature and the target value decreases. 鋼板の熱間圧延を行うための熱間圧延機と、
該熱間圧延機により熱間圧延を行われた鋼板を搬送する搬送テーブルと、
該搬送テーブルにより搬送される鋼板をコイルに巻き取る巻取装置と、
該鋼板の搬送方向へ向けて複数基並設されるとともに、前記搬送テーブルにより搬送される鋼板へ向けて、予め定められた熱間圧延条件に基づいて鋼板の巻取温度を演算により予測することにより予め定められる冷却条件で冷却水を噴射することによって該鋼板を冷却するための水冷装置と、
複数基の前記水冷装置それぞれの入側における鋼板の温度を測定するとともに、複数基の前記水冷装置のうちの最下流に位置する水冷装置の出側における鋼板の温度を測定する温度計と、
さらに、複数基の前記水冷装置により冷却される鋼板の巻取温度を演算により予測した結果に基づいて複数基の前記水冷装置を制御することにより該巻取温度を目標温度に制御するための制御コントローラと
を備える熱延鋼板の製造装置であって、
該制御コントローラは、前記熱間圧延の途中で、前記予め定められた熱間圧延条件とは異なる他の熱間圧延条件に変更して該熱間圧延を引き続き行う場合に、
前記他の熱間圧延条件と、複数基の前記水冷装置のうちの最上流側に位置する水冷装置の入側における鋼板の温度の測定値とに基づいて、前記鋼板の巻取温度を目標値とすることが可能な、複数基の前記水冷装置全てにおける冷却条件の設定値を求め、さらに
前記他の熱間圧延条件と、複数の前記水冷装置のうちで最も上流側に位置する水冷装置以外の１又は２以上の水冷装置の入側における鋼板の温度の測定値とに基づいて、少なくとも前記１又は２以上の水冷装置について求めた前記冷却条件の設定値を、さらに修正して設定すること、及び
前記水冷装置は、開度が独立して制御可能であって噴射する前記冷却水の水量を調整する複数の水量調整バルブを有するとともに、前記冷却条件は、該水量調整バルブの開度であること
を特徴とする熱延鋼板の製造装置。 A hot rolling mill for hot rolling steel sheets;
A transport table for transporting a steel plate that has been hot-rolled by the hot rolling mill;
A winding device that winds a steel plate conveyed by the conveyance table around a coil;
A plurality of the steel plates are arranged in parallel in the conveying direction of the steel plate, and the coiling temperature of the steel plate is predicted by calculation based on predetermined hot rolling conditions toward the steel plate conveyed by the conveying table. A water cooling device for cooling the steel sheet by injecting cooling water under a cooling condition predetermined by
A thermometer for measuring the temperature of the steel plate on the entry side of each of the plurality of water cooling devices, and measuring the temperature of the steel plate on the outlet side of the water cooling device located on the most downstream side of the plurality of water cooling devices,
Furthermore, the control for controlling the winding temperature to the target temperature by controlling the plurality of water cooling devices based on the result of predicting the winding temperature of the steel sheet cooled by the plurality of water cooling devices by calculation. A hot-rolled steel sheet manufacturing apparatus comprising a controller,
The controller, during the hot rolling, when changing to another hot rolling condition different from the predetermined hot rolling condition to continue the hot rolling,
Based on the other hot rolling conditions and the measured value of the temperature of the steel plate on the inlet side of the water cooling device located on the most upstream side of the plurality of water cooling devices, the coiling temperature of the steel plate is a target value. The set values of the cooling conditions in all of the plurality of water cooling devices can be obtained, and the other hot rolling conditions and the water cooling devices other than the water cooling device located on the most upstream side among the plurality of water cooling devices Based on the measured value of the temperature of the steel plate on the inlet side of one or more of the water cooling devices, at least the setting value of the cooling condition obtained for the one or more of the water cooling devices is further corrected and set. ,as well as
The water cooling device has a plurality of water amount adjustment valves that can independently control the opening degree and adjust the amount of the cooling water to be injected, and the cooling condition is the opening degree of the water amount adjustment valve. <br/> An apparatus for producing a hot-rolled steel sheet.
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