JP2010036209A - Method for controlling conveyance of rolled stock on hot-rolling line - Google Patents

Method for controlling conveyance of rolled stock on hot-rolling line Download PDF

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JP2010036209A
JP2010036209A JP2008201477A JP2008201477A JP2010036209A JP 2010036209 A JP2010036209 A JP 2010036209A JP 2008201477 A JP2008201477 A JP 2008201477A JP 2008201477 A JP2008201477 A JP 2008201477A JP 2010036209 A JP2010036209 A JP 2010036209A
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conveyance
time
temperature
rolled
rolling line
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JP5266941B2 (en
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Kisho Mihara
紀章 三原
Makoto Imai
誠 今井
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JFE Steel Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for controlling the conveyance of rolled stocks on a hot-rolling line by which the amount of temperature drop accompanying conveyance interference of rolled stocks and a measure for evading the interference on a hot-rolling line are minimized. <P>SOLUTION: Just after the rolled stock is extracted, the predictive calculation of conveying time to each equipment on the line and material temperature hereafter is performed and, after that, when the rolled stock arrives at each equipment, the above predictive calculation is performed again. At this time, when the prediction errors are generated on the conveying time or the material temperature, the equipment position where the predictive errors are minimum is searched about whether conveyance control such as material standby and oscillation is performed in any equipment position. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、圧延材の熱間圧延ライン上での搬送時刻ならびに材料温度を制御する熱間圧延ラインにおける圧延材の搬送制御方法に関するものである。   The present invention relates to a rolling material conveyance control method in a hot rolling line for controlling the conveyance time and material temperature of a rolled material on a hot rolling line.

従来、熱間圧延ラインにおいては、加熱炉からの圧延材の抽出タイミング(抽出ピッチ)等を定めるに際して、計算機を利用しライン上の各ポイントでの圧延材の通過時刻(搬送時刻)を予測して搬送ダイアグラムを作成し、それに基づいて、先行材との衝突が起こらない最小時間を抽出ピッチとしている(いわゆる、ミルペーシングピッチコントロールである)。   Conventionally, in the hot rolling line, when determining the extraction timing (extraction pitch) of the rolled material from the heating furnace, the passage time (conveying time) of the rolled material at each point on the line is predicted using a computer. Then, a conveyance diagram is created, and based on this, the minimum time during which no collision with the preceding material occurs is set as the extraction pitch (so-called mill pacing pitch control).

しかし、熱間圧延ライン上では、幅圧延中あるいは水平圧延中でのミルと圧延材間の滑りや、テーブル搬送中の圧延材の滑り等によって、予測搬送ダイアグラムと実績搬送ダイアグラムの不一致(誤差)が生じる場合が少なくない。   However, on the hot rolling line, there is a discrepancy (error) between the predicted conveyance diagram and the actual conveyance diagram due to slippage between the mill and the rolled material during width rolling or horizontal rolling, and slipping of the rolled material during table conveyance. Is often the case.

このような不一致(誤差)を低減するための技術として、発生した誤差に対して圧延材間の衝突を避けるための待機機能(テーブル減速・オシレーション)を設けたもの(例えば、特許文献1または特許文献2)等が開示されている。
特開2000−117312号公報 特開2001−137919号公報
As a technique for reducing such inconsistency (error), a technique provided with a standby function (table deceleration / oscillation) for avoiding a collision between rolled materials against the generated error (for example, Patent Document 1 or Patent Document 2) and the like are disclosed.
JP 2000-1117312 A JP 2001-137919 A

しかしながら、前述の特許文献1または特許文献2に開示された技術では、材料搬送タイミングを調整することを主眼にしているため、この搬送調整による材料温度降下量については適切な処置ができない。   However, the technique disclosed in Patent Document 1 or Patent Document 2 described above mainly focuses on adjusting the material conveyance timing, and therefore, an appropriate measure cannot be taken for the material temperature drop due to the conveyance adjustment.

そのため、先行する圧延材に遅れが生じ、それにともなって後行する圧延材に先行材との衝突を避けるためにライン上で待ち時間が発生した場合、その待ち時間が発生した場所がライン下流であれば、ライン上流で待ちが発生した時と比べて圧延により材料厚さが薄くなっているため、温度降下量が大きくなり品質に影響を与える場合も少なくない。   Therefore, if a delay occurs in the preceding rolled material, and a waiting time occurs on the line in order to avoid a collision with the preceding material in the subsequent rolled material, the place where the waiting time has occurred is downstream in the line. If so, the material thickness is reduced by rolling compared to when waiting occurs upstream in the line, so there are many cases where the temperature drop increases and the quality is affected.

本発明では、上記のような事情に鑑みてなされたものであり、熱間圧延ラインにおいて、圧延材の搬送干渉ならびに干渉回避の処置にともなう温度降下量を最小にする、熱間圧延ラインにおける圧延材の搬送制御方法を提供することを課題とする。   The present invention has been made in view of the circumstances as described above, and in a hot rolling line, rolling in a hot rolling line that minimizes the amount of temperature drop due to the conveyance interference and interference avoidance treatment of the rolled material. It is an object of the present invention to provide a material conveyance control method.

本発明の請求項1に係る発明は、熱間圧延ラインにおける圧延材の搬送制御方法であって、圧延材が抽出された直後に、その後の前記ライン上の前記各設備への搬送時刻および材料温度の予測計算を行い、その後に前記各設備に到着した時に、前記予測計算を再度行い、この時に搬送時刻または材料温度に予測誤差が発生した場合に、どの設備位置で材料待機などの搬送制御を実施するかを予測誤差最小の設備位置を探索することにより決めることを特徴とする熱間圧延ラインにおける圧延材の搬送制御方法である。   The invention according to claim 1 of the present invention is a method for controlling the conveyance of a rolled material in a hot rolling line, and immediately after the rolled material is extracted, the conveyance time and material to each facility on the subsequent line Performs a prediction calculation of temperature, and then performs the prediction calculation again when it arrives at each facility. At this time, if a prediction error occurs in the transfer time or material temperature, transfer control such as material standby at any equipment position Is determined by searching for an equipment position with a minimum prediction error. This is a conveyance control method for rolled material in a hot rolling line.

本発明は、熱間圧延ライン上の圧延材の搬送を調整することによって、各ポイントにおける当該圧延材の実績通過時刻が予定通過時刻に一致するようにしているので、遅れが生じた場合であってもその遅れを取り戻すことができるとともに、後行材の抽出時刻を遅らせることがないので加熱炉からの圧延材の抽出時刻が明確になり、待ち時間が削減される。その結果、搬送時間調整による材料温度への影響を最小化することにより、製品品質の安定化を図ることが可能となる。   The present invention is the case where a delay occurs because the actual passing time of the rolled material at each point matches the planned passing time by adjusting the conveyance of the rolled material on the hot rolling line. However, the delay can be recovered and the extraction time of the succeeding material is not delayed, so that the extraction time of the rolled material from the heating furnace becomes clear and the waiting time is reduced. As a result, it is possible to stabilize the product quality by minimizing the influence on the material temperature due to the conveyance time adjustment.

従来の技術による搬送干渉の調整は、隣接設備の在荷状況より上流に位置する圧延材の設備進入条件を決定しており、圧延材の温度降下量の大小については同時に考慮できていない。一方、温度降下の調整は、たとえば、粗ミル最終段あるいは、仕上げ圧延機入側に配置された温度計で実測した圧延材の温度と当初の目標温度とに格差のある場合には、圧延材待機などの手段で温度調整が行われる。このとき圧延材の搬送干渉については、前述の設備進入条件によるものとし、一環とした搬送制御が行われていない。   The adjustment of the conveyance interference by the conventional technique determines the facility entry condition of the rolled material located upstream from the stock status of the adjacent facilities, and cannot consider simultaneously the magnitude of the temperature drop amount of the rolled material. On the other hand, the adjustment of the temperature drop is performed when, for example, there is a difference between the temperature of the rolled material measured with a thermometer arranged at the final stage of the rough mill or the entrance of the finishing rolling mill and the initial target temperature. Temperature adjustment is performed by means such as standby. At this time, the conveyance interference of the rolled material is based on the above-described equipment entry condition, and the conveyance control as a part is not performed.

そこで、この問題を解決するために、本発明では図1の処理手順に示すように、圧延材が抽出された直後に、その後の搬送時刻・材料温度の予測計算(搬送時刻予測計算から、圧延材の材料温度降下の予測が可能)を行い、その後の各設備位置に到着した時に、前記予測計算を再度おこない、この時に搬送時刻または材料温度に予測誤差が発生した場合、どの位置で材料待機、オシレーションなどの搬送制御を実施するかを誤差最小の位置を探索することによって決定するものである。   Therefore, in order to solve this problem, in the present invention, as shown in the processing procedure of FIG. 1, immediately after the rolling material is extracted, a prediction calculation of the subsequent conveyance time / material temperature (from the conveyance time prediction calculation, the rolling The material temperature drop of the material can be predicted), and when it arrives at each subsequent equipment position, the above prediction calculation is performed again, and if a prediction error occurs in the transfer time or material temperature at this time, the material standby position It is determined by searching for the position with the smallest error whether or not the conveyance control such as oscillation is performed.

たとえば、先行材がスリップなどで遅れ、後行材との設備通過タイミングが近接した場合(厳密には、必要な設備アイドル時間が取れない場合)、後行材をいずれかの設備進入前で待機させなければならない。   For example, if the preceding material is delayed due to slip, etc., and the equipment passage timing with the following material is close (strictly speaking, when the necessary equipment idle time cannot be obtained), the following material is waited before entering any equipment. I have to let it.

材料温度の目標は仕上げ圧延機前の温度計位置に定められており、上記条件で当位置における温度推定値と目標値の格差が大きい場合(目標温度<実績温度)は、下流(この場合、仕上げ入側テーブル上)で待機することにより、温度降下量を大きくとれる。   The target of the material temperature is set at the thermometer position before the finish rolling mill. If there is a large difference between the estimated temperature value and the target value at this position under the above conditions (target temperature <actual temperature), then downstream (in this case, By waiting on the finishing entry side table), the amount of temperature drop can be increased.

一方、搬送時刻再計算により、ある程度の材料待機は必要であるが、温度降下予測上、目標値とよく一致している場合は、温度降下の影響の少ない設備位置(上流の材料板厚の厚い位置)で待機処置をすることが望ましい。   On the other hand, due to the recalculation of the transport time, a certain amount of material standby is required. However, if the temperature drop is predicted and the target value is in good agreement, the equipment position where the influence of the temperature drop is small (the upstream material thickness is thick) It is desirable to perform waiting treatment at the position).

図2は、通常実施されている圧延材搬送管理の基本的な考え方を説明する図である。図中の符号は、1は加熱炉、2は粗圧延機、3は仕上圧延機、および4はコイラーをそれぞれ表し、熱間圧延ラインの設備配列の概要を表している。熱間圧延ライン上での圧延材の通過時刻はライン上の各設備位置に対して算出され、先行材と後行材の各設備非稼働時間(アイドル時間)一定時間となるよう搬送ダイアグラムが作成されている。したがって、ある設備に先行材が存在している場合は、後行材は、従来の搬送制御方法ではその設備の入側にて待機することになる。また、搬送ダイアグラムでの搬送時刻から、図中に併記したように圧延材の材料温度降下の予測が可能である。   FIG. 2 is a diagram for explaining a basic concept of the rolling material conveyance management that is normally performed. In the figure, reference numeral 1 denotes a heating furnace, 2 denotes a roughing mill, 3 denotes a finish rolling mill, and 4 denotes a coiler, and represents an outline of the equipment arrangement of the hot rolling line. The passing time of the rolled material on the hot rolling line is calculated for each equipment position on the line, and a conveyance diagram is created so that the equipment non-operation time (idle time) of the preceding material and the following material is constant. Has been. Therefore, when the preceding material exists in a certain facility, the succeeding material waits on the entry side of the facility in the conventional transport control method. In addition, the material temperature drop of the rolled material can be predicted from the conveyance time on the conveyance diagram as shown in the figure.

このとき、後行材の温度履歴によっては、つまり最低の加熱温度で抽出された場合などは、この待機により温度降下が発生し、仕上げ入側にて所望の温度を確保できない可能性がある。この温度降下量は下流工程ほど板厚が薄くなるため、その影響が拡大する(図3参照)。   At this time, depending on the temperature history of the succeeding material, that is, when it is extracted at the lowest heating temperature, a temperature drop occurs due to this standby, and there is a possibility that a desired temperature cannot be secured on the finishing entry side. Since the plate thickness becomes thinner in the downstream process, the influence of this temperature drop amount expands (see FIG. 3).

これに対し、圧延材が各設備に到達した際、搬送時刻再計算、温度降下再計算を実施し、先行材との時刻差より、搬送時刻を修正(待機処置を実施)要否ならびに修正時の温度降下影響量を算出、その待機処置の実施位置をいずれの設備位置に置くかにより、温度降下の影響がもっとも最小となる位置を決定することにより、搬送干渉と温度の影響を最小化できる。図4は、本発明における圧延材の搬送制御方法を説明する図である。この例では、図3の場合に比べて後行材の待機位置を上流にすることによって、後行材の温度降下を小さくすることができている。   On the other hand, when the rolled material reaches each facility, it recalculates the conveyance time and recalculates the temperature drop, and it is necessary to correct the conveyance time (perform standby treatment) based on the time difference from the preceding material, and at the time of correction By calculating the temperature drop effect amount and determining the position where the standby treatment is performed at which equipment position, the influence of the temperature drop can be minimized, thereby minimizing the influence of transport interference and temperature. . FIG. 4 is a diagram for explaining a rolled material conveyance control method according to the present invention. In this example, the temperature drop of the succeeding material can be reduced by setting the waiting position of the succeeding material upstream as compared with the case of FIG.

以下の表1は、従来技術と本発明における仕上げ入り側温度影響評価条件および結果の一例を示している。また、図5は、本発明の実施例における仕上げ入り側温度影響の比較を示す図である。本発明により、搬送干渉発生時の圧延材温度に対する影響を最小化できることが明らかであり、本発明を適用することにより、上記仕上げ入り側温度影響の抑制のほか、これを加熱炉抽出温度へ反映することにより、燃料原単位の向上が期待できる。   Table 1 below shows an example of conditions and results for evaluating the temperature influence on the finishing side in the prior art and the present invention. Moreover, FIG. 5 is a figure which shows the comparison of the temperature effect on the finishing side in the Example of this invention. According to the present invention, it is clear that the influence on the temperature of the rolled material at the time of occurrence of conveyance interference can be minimized, and by applying the present invention, in addition to the suppression of the temperature influence on the finishing side, this is reflected in the heating furnace extraction temperature. By doing so, an improvement in the fuel consumption rate can be expected.

本発明に係る圧延材の搬送制御方法の処理手順例を示す図である。It is a figure which shows the process sequence example of the conveyance control method of the rolling material which concerns on this invention. 通常実施されている圧延材搬送管理の基本的な考え方を説明する図である。It is a figure explaining the basic view of the rolling material conveyance management currently implemented normally. 従来の圧延材搬送干渉修正方法を説明する図である。It is a figure explaining the conventional rolling material conveyance interference correction method. 本発明における圧延材の搬送制御方法を説明する図である。It is a figure explaining the conveyance control method of the rolling material in this invention. 本発明の実施例における仕上げ入り側温度影響の比較を示す図である。It is a figure which shows the comparison of the finishing entrance side temperature influence in the Example of this invention.

符号の説明Explanation of symbols

1 加熱炉
2 粗圧延機
3 仕上圧延機
4 コイラー
DESCRIPTION OF SYMBOLS 1 Heating furnace 2 Rough rolling mill 3 Finish rolling mill 4 Coiler

Claims (1)

熱間圧延ラインにおける圧延材の搬送制御方法であって、
圧延材が抽出された直後に、その後の前記ライン上の前記各設備への搬送時刻および材料温度の予測計算を行い、その後に前記各設備に到着した時に、前記予測計算を再度行い、この時に搬送時刻または材料温度に予測誤差が発生した場合に、どの設備位置で材料待機、オシレーションなどの搬送制御を実施するかを予測誤差最小の設備位置を探索することにより決めることを特徴とする熱間圧延ラインにおける圧延材の搬送制御方法。
A method for controlling the conveyance of a rolled material in a hot rolling line,
Immediately after the rolling material is extracted, the transport time and material temperature to each facility on the subsequent line are predicted, and when the equipment arrives thereafter, the prediction calculation is performed again. When a prediction error occurs in the transfer time or material temperature, it is determined by searching the facility position with the smallest prediction error to determine the facility position at which the conveyance control such as material standby and oscillation is performed. A method for controlling the conveyance of rolled material in a hot rolling line.
JP2008201477A 2008-08-05 2008-08-05 Rolling material conveyance control method in hot rolling line Expired - Fee Related JP5266941B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012166243A (en) * 2011-02-15 2012-09-06 Jfe Steel Corp Conveyance control method for rolled material in hot rolling line

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06299231A (en) * 1993-04-09 1994-10-25 Kawasaki Steel Corp Method for adjusting mill pacing in hot rolling
JP2002126814A (en) * 2000-08-16 2002-05-08 Kawasaki Steel Corp Hot rolling method
JP2008114230A (en) * 2006-10-31 2008-05-22 Jfe Steel Kk Method for controlling temperature of rolling material in hot rolling, and hot rolling method using the same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06299231A (en) * 1993-04-09 1994-10-25 Kawasaki Steel Corp Method for adjusting mill pacing in hot rolling
JP2002126814A (en) * 2000-08-16 2002-05-08 Kawasaki Steel Corp Hot rolling method
JP2008114230A (en) * 2006-10-31 2008-05-22 Jfe Steel Kk Method for controlling temperature of rolling material in hot rolling, and hot rolling method using the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012166243A (en) * 2011-02-15 2012-09-06 Jfe Steel Corp Conveyance control method for rolled material in hot rolling line

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