JP2009028747A - Method for rolling thick steel plate - Google Patents
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本発明は、可逆式圧延機の下流に圧延材（厚鋼板）を冷却する冷却装置を備えた熱間圧延ラインにおいて、圧延途中で圧延材を冷却し、所定の温度まで到達した後に、再度圧延を行う厚鋼板の圧延方法に関し、特に、可逆式圧延機のアイドル時間を低減するために、２本の圧延材を交互に圧延するタンデム圧延と呼ばれる厚鋼板の圧延方法に関する。 The present invention, in a hot rolling line equipped with a cooling device that cools a rolled material (thick steel plate) downstream of a reversible rolling mill, cools the rolled material during rolling, reaches a predetermined temperature, and then rolls again. In particular, the present invention relates to a thick steel plate rolling method called tandem rolling in which two rolled materials are alternately rolled in order to reduce idle time of a reversible rolling mill.
近年、厚鋼板の熱間圧延においては、強度や靭性の優れた厚鋼板の製造が求められており、その一例として、圧延材に制御圧延（Controlled Rolling；ＣＲ）を施すことにより、優れた材質の厚鋼板を造り込んでいる。すなわち、１０００℃以上に加熱したスラブを一旦所定の中間板厚まで圧延し、その後、圧延材の温度が未再結晶温度域やその温度域に近い温度域にある状態で仕上板厚まで圧延を行うものである。例えば、厚さ２００〜３００ｍｍのスラブを１１００〜１２００℃程度まで加熱後、仕上板厚の１．５〜２倍程度の中間板厚まで圧延し、その後、温度が未再結晶域である８５０℃以下になった時点で制御圧延を開始し、仕上板厚（例えば１５ｍｍ）まで圧延するというものである。 In recent years, in the hot rolling of thick steel plates, the production of thick steel plates with excellent strength and toughness has been demanded. As an example, excellent material can be obtained by subjecting the rolled material to controlled rolling (CR). The steel plate is built in. That is, a slab heated to 1000 ° C. or higher is once rolled to a predetermined intermediate plate thickness, and then rolled to a finished plate thickness in a state where the temperature of the rolled material is in a non-recrystallization temperature range or a temperature range close to that temperature range. Is what you do. For example, after heating a slab having a thickness of 200 to 300 mm to about 1100 to 1200 ° C., the slab is rolled to an intermediate plate thickness of about 1.5 to 2 times the finished plate thickness, and then the temperature is 850 ° C., which is an unrecrystallized region. Control rolling is started at the time when the following is reached, and rolling is performed to a finished sheet thickness (for example, 15 mm).
その際に、制御圧延を開始する温度（制御圧延開始温度）が低くかつ制御圧延を開始する板厚（制御圧延開始板厚）が厚い場合には、圧延材が制御圧延開始温度になるまでにかなりの時間を要するため、圧延機（可逆式圧延機）近傍の搬送ライン上で制御圧延開始温度になるまで圧延材を空冷状態で待機させていた。その結果、その冷却待ちによって圧延機に空き時間（アイドル時間）が発生し、圧延能率が低下するという問題が生じていた。 At that time, when the temperature at which controlled rolling is started (controlled rolling start temperature) is low and the plate thickness at which controlled rolling is started (controlled rolling start plate thickness) is thick, the rolling material reaches the controlled rolling start temperature. Since a considerable amount of time is required, the rolled material is kept in an air-cooled state until the controlled rolling start temperature is reached on the conveyance line in the vicinity of the rolling mill (reversible rolling mill). As a result, a waiting time (idle time) is generated in the rolling mill due to the waiting for cooling, and the rolling efficiency is reduced.
すなわち、厚鋼板の熱間圧延ラインでは、如何に圧延機を休ませることなく、連続的に圧延材を圧延できるかが、生産能力を上げる上で重要なことであり、制御圧延材（温度調整材）の圧延では、冷却待ち（温度調整）の間に圧延機が空いてしまうので、特に圧延機が１機しかない厚鋼板の熱間圧延ラインでは、圧延能率（ライン能率）への影響が顕著であった。 In other words, in the hot rolling line for thick steel plates, how to continuously roll the rolled material without resting the rolling mill is an important factor in increasing the production capacity. In rolling (material), the rolling mill is vacant while waiting for cooling (temperature adjustment), so the effect on rolling efficiency (line efficiency) is particularly affected in the hot rolling line for thick steel plates with only one rolling mill. It was remarkable.
このような冷却待ちによって圧延機に空き時間が発生しライン能率が低下するのを解消するために、特許文献１に記載されているように、圧延材を制御圧延開始温度に冷却するための温度調整用冷却装置（水冷装置）を可逆式圧延機の下流に設置し、圧延機で中間板厚まで圧延した圧延材を温度調整用冷却装置で制御圧延開始温度に冷却（温度調整冷却）した後、再び圧延機で仕上板厚まで圧延を行う方法が取られている。 The temperature for cooling the rolled material to the control rolling start temperature as described in Patent Document 1 in order to eliminate the idle time generated in the rolling mill due to such a cooling waiting and the reduction in line efficiency. After installing the adjustment cooling device (water cooling device) downstream of the reversible rolling mill and cooling the rolled material rolled to the intermediate plate thickness with the rolling mill to the controlled rolling start temperature (temperature adjustment cooling) with the temperature adjustment cooling device The method of rolling to the finished sheet thickness with a rolling mill is taken again.
さらに、それに加えて、先行の制御圧延材（先行材）と次の制御圧延材（後行材）を交互に圧延するタンデム圧延という手法が取られている。 In addition, a technique called tandem rolling in which the preceding controlled rolled material (preceding material) and the next controlled rolled material (following material) are alternately rolled is employed.
制御圧延材のタンデム圧延では、先行材を中間板厚（制御圧延開始板厚、温度調整板厚）まで圧延した後、圧延機の下流に搬送して温度調整を行い、その先行材の温度調整が完了するまでの間に、後行材を中間板厚（制御圧延開始板厚、温度調整板厚）まで圧延し、先行材の温度調整が完了すると、後行材を圧延機の上流に搬送して待機させ、先行材の圧延を再開して、先行材を仕上板厚まで圧延し、その先行材の圧延の間に、圧延機の上流で後行材の温度調整を行い、先行材の圧延が完了したら、後行材の圧延を再開して、仕上板厚まで圧延する。このように、温度調整を要する圧延材（温度調整材）を交互に圧延することで、圧延機を効率的に運用するようにしている。 In tandem rolling of a controlled rolled material, the preceding material is rolled to an intermediate plate thickness (controlled rolling start plate thickness, temperature adjustment plate thickness), then conveyed downstream of the rolling mill to adjust the temperature, and the temperature of the preceding material is adjusted. Until the process is completed, the succeeding material is rolled to an intermediate plate thickness (controlled rolling start plate thickness, temperature adjustment plate thickness), and when the temperature adjustment of the preceding material is completed, the succeeding material is conveyed upstream of the rolling mill. Then, the rolling of the preceding material is resumed, the preceding material is rolled to the finished plate thickness, the temperature of the succeeding material is adjusted upstream of the rolling mill during the rolling of the preceding material, When the rolling is completed, the rolling of the subsequent material is resumed and rolled to the finished sheet thickness. As described above, the rolling mill is efficiently operated by alternately rolling the rolling material (temperature adjusting material) requiring temperature adjustment.
さらに、タンデム圧延の応用として、連続タンデム圧延と言って、いもづる式に次の制御圧延材に交替して行く方法も取られている。
通常の厚鋼板の熱間圧延ラインでは、圧延機の上流に冷却装置（水冷装置）が配備されていないので、前述したタンデム圧延においては、後行材を圧延機の上流で待機させて温度調整する際に、空冷状態で先行材の圧延完了を待つこととなる。 In a normal thick steel plate hot rolling line, there is no cooling device (water cooling device) upstream of the rolling mill. Therefore, in the tandem rolling mentioned above, the temperature of the succeeding material is made to wait upstream of the rolling mill. In this case, the completion of rolling of the preceding material is awaited in an air-cooled state.
そのため、図３（ａ）に示すように、先行材の圧延が完了した時に、後行材の温度調整が完了していれば、圧延機のアイドル時間が発生しないので理想的であるが、ほとんどの場合、図３（ｂ）に示すように、後行材を圧延機の上流で空冷待機させるだけでは冷却能力が不足して、目標温度まで温度降下できないことから、先行材の圧延が完了した後に、後行材を空パスで圧延機を通過させ、圧延機の下流の冷却装置で水冷して目標温度に到達した後に、圧延を再開することとなり、その間に圧延機のアイドル時間が発生してしまう。 Therefore, as shown in FIG. 3 (a), when the preceding material is completely rolled, if the temperature adjustment of the succeeding material is completed, the idle time of the rolling mill does not occur. In this case, as shown in FIG. 3 (b), the rolling of the preceding material is completed because the cooling capacity is insufficient and the temperature cannot be lowered to the target temperature simply by allowing the succeeding material to stand by air cooling upstream of the rolling mill. Later, the succeeding material was passed through the rolling mill by an empty path, and after cooling to the target temperature by cooling with a cooling device downstream of the rolling mill, the rolling was resumed, during which the rolling mill idle time occurred. End up.
このアイドル時間で、さらに次の圧延材を圧延する連続タンデム圧延を行うことができれば、圧延機にアイドル時間を発生させることなく効率的に圧延することができるが、厚鋼板のような多品種、多ロットの生産ライン（圧延ライン）では、個々の圧延材の圧延条件や温度条件が異なるため、連続タンデム圧延を適用できる圧延材は限られている。 If it is possible to perform continuous tandem rolling to roll the next rolled material in this idle time, it can be efficiently rolled without generating idle time in the rolling mill, In a multi-lot production line (rolling line), the rolling conditions and temperature conditions of individual rolled materials are different, so that the rolled materials to which continuous tandem rolling can be applied are limited.
あるいは、圧延機の上流に冷却装置（水冷装置）を新たに建設すれば良いが、建設コストが掛かってしまう。 Alternatively, a cooling device (water cooling device) may be newly constructed upstream of the rolling mill, but the construction cost is increased.
本発明は、上記のような事情に鑑みてなされたものであり、圧延機の上流に冷却装置を新たに設置することなく、効率的に温度調整材の圧延を行うことができる厚鋼板の圧延方法を提供することを目的とするものである。 The present invention has been made in view of the circumstances as described above, and rolling a thick steel plate capable of efficiently rolling a temperature adjusting material without newly installing a cooling device upstream of the rolling mill. It is intended to provide a method.
上記課題を解決するために、本発明者は鋭意検討を行った結果、厚鋼板の熱間圧延ラインにおいて圧延機の上流に設置されているＨＳＢ装置（Horizontal Scale Breaker）を利用することを思い付いた。 In order to solve the above problems, the present inventor has intensively studied, and as a result, came up with the idea of using an HSB device (Horizontal Scale Breaker) installed upstream of the rolling mill in a hot rolling line for thick steel plates. .
すなわち、厚鋼板の熱間圧延ラインには、加熱炉で圧延材の表面に形成されたスケールを除去するために、圧延機の上流にＨＳＢ装置が必ず設置されていて、圧延前の圧延材の表面スケールを除去するために使用されているが、前述のタンデム圧延において、後行材を圧延機の上流で待機させる際に、ＨＳＢ装置のデスケーリング水（ＨＳＢ装置の水平ロールで破壊された表面スケールを圧延材表面から洗い流すために用いられる水）を転用して、後行材を水冷すれば、後行材の冷却時間（温度調整時間）を短縮できて、圧延機のアイドル時間を低減することができるとの考えに至った。 That is, in order to remove the scale formed on the surface of the rolled material in the heating furnace in the hot rolling line of the thick steel plate, an HSB device is always installed upstream of the rolling mill. It is used to remove the surface scale, but in the tandem rolling described above, the descaling water of the HSB device (the surface destroyed by the horizontal roll of the HSB device) If water is used to wash the scale from the surface of the rolled material and the subsequent material is water-cooled, the cooling time (temperature adjustment time) of the subsequent material can be shortened and the idle time of the rolling mill can be reduced. I came up with the idea that I could do it.
上記の考え方に基づいて、本発明は以下の特徴を有している。 Based on the above concept, the present invention has the following features.
［１］先行の圧延材を中間板厚まで圧延した後、圧延機の下流に搬送して温度調整を行い、その先行の圧延材の温度調整が完了するまでの間に、後行の圧延材を中間板厚まで圧延し、先行の圧延材の温度調整が完了すると、後行の圧延材を圧延機の上流に搬送して待機させ、先行の圧延材の圧延を再開して、先行の圧延材を仕上板厚まで圧延し、その先行の圧延材の圧延の間に、圧延機の上流で後行の圧延材の温度調整を行い、先行の圧延材の圧延が完了したら、後行の圧延材の圧延を再開して、仕上板厚まで圧延する、厚鋼板の圧延方法において、圧延機の上流で後行の圧延材の温度調整を行う際に、ＨＳＢ装置のデスケーリング水を利用して後行の圧延材を冷却することを特徴とする厚鋼板の圧延方法。 [1] After rolling the preceding rolled material to the intermediate plate thickness, the temperature is adjusted by conveying it downstream of the rolling mill, and the subsequent rolled material is processed until the temperature adjustment of the preceding rolled material is completed. When the temperature adjustment of the preceding rolled material is completed, the succeeding rolled material is transported to the upstream of the rolling mill to wait, and the rolling of the preceding rolled material is resumed. Roll the material to the finished sheet thickness, adjust the temperature of the succeeding rolled material upstream of the rolling mill during the rolling of the preceding rolled material, and when the rolling of the preceding rolled material is completed, follow the rolling In the rolling method of thick steel plate, which resumes rolling of the material and rolls to the finished plate thickness, when adjusting the temperature of the subsequent rolled material upstream of the rolling mill, the descaling water of the HSB device is used. A method for rolling a thick steel plate, comprising cooling a subsequent rolled material.
［２］圧延機の上流で後行の圧延材の温度調整を行う際に、ＨＳＢ装置のテーブル搬送速度を調節することによって、後行の圧延材の温度降下量を制御することを特徴とする前記［１］に記載の厚鋼板の圧延方法。 [2] When adjusting the temperature of the subsequent rolled material upstream of the rolling mill, the temperature drop amount of the subsequent rolled material is controlled by adjusting the table conveying speed of the HSB device. The method for rolling thick steel plates according to the above [1].
本発明においては、先行の圧延材（先行材）と後行の圧延材（後行材）を交互に圧延するタンデム圧延を行う場合、圧延機の上流で後行材の温度調整を行う際に、ＨＳＢ装置のデスケーリング水を利用して後行材を冷却するようにしているので、これまでの空冷待機のみに比べて大幅に冷却能力が高まり、後行材の温度調整時間を短縮することができる。その結果、先行材の圧延が完了した後にさらに後行材の温度調整を行うことが不要になり、その温度調整のために生じていた圧延機のアイドル時間を削減することができる。これにより、圧延機の上流に冷却装置を新たに設置することなく、既存の設備を活用して、効率的に温度調整材の圧延を行うことが可能となる。 In the present invention, when performing tandem rolling in which the preceding rolled material (preceding material) and the following rolled material (following material) are alternately rolled, the temperature of the succeeding material is adjusted upstream of the rolling mill. Since the downstream material is cooled using the descaling water of the HSB device, the cooling capacity is greatly increased compared to the conventional air cooling standby only, and the temperature adjustment time of the subsequent material is shortened. Can do. As a result, it becomes unnecessary to further adjust the temperature of the succeeding material after the rolling of the preceding material is completed, and the idle time of the rolling mill that has occurred for the temperature adjustment can be reduced. Thereby, it becomes possible to efficiently roll the temperature adjusting material using existing equipment without newly installing a cooling device upstream of the rolling mill.
本発明の実施形態を図面に基づいて説明する。 Embodiments of the present invention will be described with reference to the drawings.
この実施形態は、１台の可逆式熱間圧延機（圧延機）でスラブを仕上板厚まで圧延する厚鋼板の熱間圧延ラインで、温度調整材（制御圧延材）のタンデム圧延を行うものであり、図１は、その際の圧延材の動きを示すものである。ここで、圧延機の上流にはＨＳＢ装置が設置され、圧延機の下流には温度調整用冷却装置（水冷装置）が設置されている。 This embodiment is a hot rolling line for thick steel plates in which a slab is rolled to a finished sheet thickness with a single reversible hot rolling mill (rolling mill), which performs tandem rolling of a temperature adjusting material (controlled rolling material). FIG. 1 shows the movement of the rolled material at that time. Here, an HSB device is installed upstream of the rolling mill, and a temperature adjusting cooling device (water cooling device) is installed downstream of the rolling mill.
図１に示すように、この実施形態においては、先行材を中間板厚（制御圧延開始板厚、温度調整板厚）まで圧延した後、圧延機の下流に搬送して、温度調整用冷却装置での水冷または空冷によってオシレーションしながら温度調整を行い、その先行材の温度調整が完了するまでの間に、後行材を中間板厚（制御圧延開始板厚、温度調整板厚）まで圧延し、先行材の温度調整が完了すると、後行材を圧延機の上流に搬送して待機させ、先行材の圧延を再開して、先行材を仕上板厚まで圧延し、その先行材の圧延の間に、圧延機の上流でＨＳＢ装置のデスケーリング水を利用して後行材の温度調整を行い、先行材の圧延が完了したら、後行材の圧延を再開して、仕上板厚まで圧延する。 As shown in FIG. 1, in this embodiment, after rolling the preceding material to an intermediate plate thickness (control rolling start plate thickness, temperature adjustment plate thickness), it is conveyed downstream of the rolling mill, and a temperature adjustment cooling device Adjust the temperature while oscillating by water cooling or air cooling at, and roll the succeeding material to the intermediate plate thickness (control rolling start plate thickness, temperature adjustment plate thickness) until the temperature adjustment of the preceding material is completed When the temperature adjustment of the preceding material is completed, the succeeding material is transported to the upstream of the rolling mill and waits, the rolling of the preceding material is resumed, the preceding material is rolled to the finished plate thickness, and the preceding material is rolled. During the process, the descaling water of the HSB device is used upstream of the rolling mill to adjust the temperature of the succeeding material. When the preceding material has been rolled, the succeeding material is resumed until the finished sheet thickness is reached. Roll.
そして、この実施形態では、圧延機の上流で後行材の温度調整を行う際に、後行材がＨＳＢ装置を往復通過する時のＨＳＢ装置のテーブル搬送速度を調節して、デスケーリング水による水冷時間を調整することで、後行材の温度降下量を制御している。すなわち、ＨＳＢ装置での水冷による温度降下とそれ以外の待機空冷による温度降下を適切に組み合わせることによって、先行材の圧延が完了した時に後行材が目標温度になるようにしており、それにより、先行材の圧延が完了したら直ちに後行材の圧延が再開できるようにしている。 In this embodiment, when the temperature of the succeeding material is adjusted upstream of the rolling mill, the table transport speed of the HSB device when the succeeding material reciprocates through the HSB device is adjusted, and the descaling water is used. By adjusting the water cooling time, the temperature drop of the succeeding material is controlled. That is, by properly combining the temperature drop due to water cooling in the HSB device and the temperature drop due to other standby air cooling, the succeeding material is set to the target temperature when the rolling of the preceding material is completed, As soon as the rolling of the preceding material is completed, the rolling of the succeeding material can be resumed.
図２は、その際のＨＳＢ装置での水冷時間（ＨＳＢ装置のテーブル搬送速度）を決定するための手順を示すフロー図であり、ここでは、後行材を圧延再開のために圧延機に戻した時の後行材の予測温度（Ｔｂ）が、後行材の温度調整目標温度（Ｔｍ）に対して、Ｔｍ＋α＜Ｔｂ＜Ｔｍ＋βとなるようにしている。 FIG. 2 is a flowchart showing a procedure for determining the water cooling time (table transport speed of the HSB apparatus) in the HSB apparatus at that time. Here, the succeeding material is returned to the rolling mill to resume rolling. The predicted temperature (Tb) of the succeeding material at this time is such that Tm + α <Tb <Tm + β with respect to the temperature adjustment target temperature (Tm) of the succeeding material.
すなわち、以下のようにして、後行材のＨＳＢ装置での水冷時間（ＨＳＢ装置のテーブル搬送速度）を決定している。 That is, the water cooling time (HSB device table conveyance speed) in the HSB device of the succeeding material is determined as follows.
ちなみに、通常、ＨＳＢ装置は、圧延前のスラブの表面スケールを除去するのに使用できるように設計されているため、ＨＳＢ装置を使用できる上限の板幅は最大スラブ幅になっている。したがって、設備制約上、ＨＳＢ装置での水冷が行えるのは、温度調整時の後行材の板幅が最大スラブ幅以下の場合である。 Incidentally, since the HSB apparatus is normally designed to be used for removing the surface scale of the slab before rolling, the upper limit plate width at which the HSB apparatus can be used is the maximum slab width. Therefore, due to equipment restrictions, water cooling with the HSB device can be performed when the plate width of the following material at the time of temperature adjustment is equal to or less than the maximum slab width.
（Ｓ１）まず、設備制約上、後行材の温度調整にＨＳＢ装置の使用が可能か否かを判断する。そして、可能（Ｙ）の場合は、（Ｓ２）に進む。一方、否（Ｎ）の場合は、（Ｓ１０）に進み、後行材の温度調整にＨＳＢ装置は使用しない。 (S1) First, it is determined whether or not the HSB device can be used to adjust the temperature of the succeeding material due to equipment restrictions. If possible (Y), the process proceeds to (S2). On the other hand, if NO (N), the process proceeds to (S10), and the HSB apparatus is not used for temperature adjustment of the succeeding material.
（Ｓ２）次に、ＨＳＢ装置のテーブル搬送速度を最大にして後行材を水冷した場合（すなわち、最短の水冷時間で水冷した場合）の後行材の温度変化を計算する。 (S2) Next, the temperature change of the succeeding material is calculated when the succeeding material is water-cooled with the table transport speed of the HSB apparatus being maximized (that is, when the water-cooling is performed with the shortest water cooling time).
（Ｓ３）次に、ＨＳＢ装置での水冷が終了した後行材が、その後に空冷待機した時の先行材の圧延完了予定時間までの温度変化を計算する。 (S3) Next, the temperature change until the rolling completion scheduled time of the preceding material when the succeeding material after the water-cooling in the HSB apparatus is air-cooling standby thereafter is calculated.
（Ｓ４）そして、（Ｓ２）と（Ｓ３）の計算結果に基づいて、後行材が圧延再開のために圧延機に戻った時の後行材の予測温度（Ｔｂ）を求める。 (S4) Then, based on the calculation results of (S2) and (S3), the predicted temperature (Tb) of the succeeding material when the succeeding material returns to the rolling mill to resume rolling is obtained.
（Ｓ５）次に、（Ｓ４）で求めた予測温度（Ｔｂ）が、後行材の温度調整目標温度（Ｔｍ）に対して、Ｔｍ＋α＜Ｔｂを満足しているかを判定する。満足している場合（Ｙ）は、ＨＳＢ装置による後行材の水冷が可能であり、（Ｓ６）に進む。一方、満足していない場合（Ｎ）は、ＨＳＢ装置で後行材を水冷すると、温度が下がり過ぎてしまうので、ＨＳＢ装置による後行材の水冷は不可であり、（Ｓ１０）に進み、後行材の温度調整にＨＳＢ装置は使用しない。 (S5) Next, it is determined whether the predicted temperature (Tb) obtained in (S4) satisfies Tm + α <Tb with respect to the temperature adjustment target temperature (Tm) of the succeeding material. When satisfied (Y), the subsequent material can be cooled with water by the HSB device, and the process proceeds to (S6). On the other hand, when not satisfied (N), if the HSB device cools the trailing material with water, the temperature will drop too much, so the cooling of the trailing material with the HSB device is impossible, and the process proceeds to (S10). The HSB device is not used to adjust the temperature of the row material.
（Ｓ６）ＨＳＢ装置のテーブル搬送速度を仮決定して後行材を水冷し、その後の空冷待機による先行材の圧延完了予定時間までの温度変化を計算する。 (S6) Temporarily determine the table conveyance speed of the HSB device, cool the subsequent material with water, and calculate the temperature change until the scheduled rolling completion time of the preceding material due to the subsequent air cooling standby.
（Ｓ７）そして、（Ｓ６）の計算結果に基づいて、後行材が圧延再開のために圧延機に戻った時の後行材の予測温度（Ｔｂ）を求める。 (S7) Then, based on the calculation result of (S6), the predicted temperature (Tb) of the succeeding material when the succeeding material returns to the rolling mill to resume rolling is obtained.
（Ｓ８）次に、（Ｓ７）で求めた予測温度（Ｔｂ）が、後行材の温度調整目標温度（Ｔｍ）に対して、Ｔｂ＜Ｔｍ＋βを満足しているかを判定する。満足している場合（Ｙ）は、仮決定したテーブル搬送速度を、正式のテーブル搬送速度に決定して、テーブル搬送速度の設定を終了する。一方、満足していない場合（Ｎ）は、（Ｓ９）に進む。 (S8) Next, it is determined whether the predicted temperature (Tb) obtained in (S7) satisfies Tb <Tm + β with respect to the temperature adjustment target temperature (Tm) of the succeeding material. If satisfied (Y), the temporarily determined table transport speed is determined as the official table transport speed, and the table transport speed setting is completed. On the other hand, if not satisfied (N), the process proceeds to (S9).
（Ｓ９）仮決定のＨＳＢ装置のテーブル搬送速度を適宜増減して変更する。そして、（Ｓ６）〜（Ｓ８）を繰り返す。 (S9) The table conveyance speed of the temporarily determined HSB apparatus is appropriately increased and decreased. Then, (S6) to (S8) are repeated.
以上の手順によって、後行材を圧延機に戻した時の後行材の予測温度（Ｔｂ）が、後行材の温度調整目標温度（Ｔｍ）に対して、Ｔｍ＋α＜Ｔｂ＜Ｔｍ＋βとなるように、後行材のＨＳＢ装置での水冷時間（ＨＳＢ装置のテーブル搬送速度）が決定される。 According to the above procedure, the predicted temperature (Tb) of the succeeding material when the succeeding material is returned to the rolling mill is Tm + α <Tb <Tm + β with respect to the temperature adjustment target temperature (Tm) of the succeeding material. In addition, the water cooling time (the table transport speed of the HSB device) in the HSB device of the succeeding material is determined.
このようにして、この実施形態では、温度調整材のタンデム圧延において、圧延機の上流で後行材の温度調整を行う際に、ＨＳＢ装置のデスケーリング水を利用して後行材を冷却するようにしているので、これまでの空冷待機のみに比べて大幅に冷却能力が高まり、後行材の温度調整時間を短縮することができる。その結果、先行材の圧延が完了したら直ちに後行材の圧延が再開できるようになり、これまでのような後行材の追加温度調整が不要になって、その追加温度調整のために生じていた圧延機のアイドル時間を削減することができる。これにより、圧延機の上流に冷却装置を新たに設置することなく、既存の設備を活用して、効率的に温度調整材の圧延を行うことが可能となる。 Thus, in this embodiment, in the tandem rolling of the temperature adjusting material, when the temperature of the succeeding material is adjusted upstream of the rolling mill, the succeeding material is cooled using the descaling water of the HSB device. As a result, the cooling capacity is significantly increased as compared with the conventional air-cooling standby only, and the temperature adjustment time of the succeeding material can be shortened. As a result, as soon as the rolling of the preceding material is completed, the rolling of the succeeding material can be resumed, and the additional temperature adjustment of the succeeding material is no longer necessary and occurs due to the additional temperature adjustment. The idle time of the rolling mill can be reduced. Thereby, it becomes possible to efficiently roll the temperature adjusting material using existing equipment without newly installing a cooling device upstream of the rolling mill.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011147962A (en) * | 2010-01-21 | 2011-08-04 | Jfe Steel Corp | Method for manufacturing thick steel plate and method for determining water-cooling pass number |
| JP2014035590A (en) * | 2012-08-07 | 2014-02-24 | Toshiba Mitsubishi-Electric Industrial System Corp | Data analysis device |
| JP2014069190A (en) * | 2012-09-27 | 2014-04-21 | Jfe Steel Corp | Hot rolling equipment, and hot rolling method |
| CN112808770A (en) * | 2020-12-29 | 2021-05-18 | 山西太钢不锈钢股份有限公司 | Rapid switching method for steel and titanium rolling |
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2007
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011147962A (en) * | 2010-01-21 | 2011-08-04 | Jfe Steel Corp | Method for manufacturing thick steel plate and method for determining water-cooling pass number |
| JP2014035590A (en) * | 2012-08-07 | 2014-02-24 | Toshiba Mitsubishi-Electric Industrial System Corp | Data analysis device |
| JP2014069190A (en) * | 2012-09-27 | 2014-04-21 | Jfe Steel Corp | Hot rolling equipment, and hot rolling method |
| CN112808770A (en) * | 2020-12-29 | 2021-05-18 | 山西太钢不锈钢股份有限公司 | Rapid switching method for steel and titanium rolling |
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