JP2010202958A - Method for determining extraction interval from heating furnace - Google Patents

Method for determining extraction interval from heating furnace Download PDF

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JP2010202958A
JP2010202958A JP2009052751A JP2009052751A JP2010202958A JP 2010202958 A JP2010202958 A JP 2010202958A JP 2009052751 A JP2009052751 A JP 2009052751A JP 2009052751 A JP2009052751 A JP 2009052751A JP 2010202958 A JP2010202958 A JP 2010202958A
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heating furnace
extraction interval
temperature
finish
time
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JP5581600B2 (en
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Keigo Obita
敬悟 帯田
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Jfe Steel Corp
Jfeスチール株式会社
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for determining an extraction interval from a heating furnace, which can optimize the extraction interval from the heating furnace by calculating a predicted transportation time of each material to be rolled in consideration of the stand-by time in the inlet side of a finishing mill, and conducting a mill pacing control for the materials to be rolled. <P>SOLUTION: The method for determining the extraction interval from the heating furnace in a controlled rolling process which starts finish rolling at a specified temperature or lower includes: predicting a temperature of a steel sheet when the steel sheet arrives at the inlet side of the finishing mill; calculating the stand-by time in the inlet side of the finishing mill, for which the steel sheet should wait before the rolling starts, based on the predicted temperature in the inlet side of the finishing mill; calculating the predicted transportation time in consideration of the calculated stand-by time on the inlet side of the finishing mill; and conducting the mill pacing control for the steel sheet to determine the shortest extraction interval from the heating furnace. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、熱間圧延においてライン上を搬送する材の互いの干渉を予測し、加熱炉抽出間隔を決定する、加熱炉抽出間隔決定方法に関するものである。   The present invention relates to a heating furnace extraction interval determination method that predicts mutual interference of materials conveyed on a line in hot rolling and determines a heating furnace extraction interval.
熱間圧延における加熱炉抽出間隔の決定方法として、加熱炉から仕上ミルまでのライン上を搬送する材の互いの干渉を予測し、加熱炉抽出間隔を決定するミルペーシング(Mill Pacing Control)技術がある。   As a method for determining the heating furnace extraction interval in hot rolling, there is Mill Pacing Control technology that predicts the mutual interference of materials conveyed on the line from the heating furnace to the finishing mill and determines the heating furnace extraction interval. is there.
抽出間隔の早期化もしくは予測精度向上を目的として、これまでに種々のミルペーシング技術が提案されてきている。   Various mill pacing techniques have been proposed so far for the purpose of accelerating the extraction interval or improving the prediction accuracy.
例えば、特許文献1には、搬送予測に用いる搬送モデルの調整に学習機能を有する技術が、また、特許文献2には、予測不能な誤差に対して圧延材間の衝突を避けるための待機機能を設ける技術が、さらに、特許文献3には、搬送予測時刻の修正を順次行うことで圧延材の早期抽出を行う技術がそれぞれ開示されている。   For example, Patent Document 1 discloses a technique having a learning function for adjusting a transport model used for transport prediction, and Patent Document 2 discloses a standby function for avoiding a collision between rolled materials against an unpredictable error. Further, Patent Document 3 discloses a technique for early extraction of the rolled material by sequentially correcting the predicted conveyance time.
なお、[発明を実施するための形態]の項目において、本出願人の未公開先行出願について説明するが、その出願番号を記載しておく。すなわち、特願2008−85675号(未公開出願1)である。   In addition, in the item of “Mode for Carrying Out the Invention”, the unpublished prior application of the present applicant will be described, and the application number is described. That is, Japanese Patent Application No. 2008-85675 (Unpublished Application 1).
特開2004−25245号公報JP 2004-25245 A 特開2000−117312号公報JP 2000-1117312 A 特許3826801号公報Japanese Patent No. 3826801
熱間圧延においては、材質作り込みを目的として規定温度以下で仕上圧延を開始する制御圧延という概念が存在する。このため、仕上ミル入側到達時に鋼板温度が規定温度以上であれば、規定温度以下になるまで鋼板を待機させるという操業を行っている。   In hot rolling, there is a concept of controlled rolling in which finish rolling is started at a specified temperature or lower for the purpose of material formation. For this reason, if the steel sheet temperature is equal to or higher than the specified temperature when reaching the finishing mill entry side, the operation is performed to wait for the steel sheet until the temperature reaches the specified temperature or lower.
しかしながら、上記特許文献1ないし3に開示された技術にあっては、上述した規定温度以下になるまで鋼板を待機させなければならない仕上入側待機時間を正確に考慮できていなかったため、抽出間隔が不適切となる場合が生ずるという問題がある。   However, in the techniques disclosed in Patent Documents 1 to 3, the finishing interval waiting time that the steel sheet must be kept on standby until the temperature becomes equal to or lower than the above-described specified temperature cannot be accurately taken into consideration. There is a problem that it may become inappropriate.
本発明では、これら従来技術の問題点に鑑み、仕上入側待機時間を考慮して各圧延材の搬送予測を計算し、ミルペーシングを行うことで加熱炉抽出間隔の適正化を図ることができる、加熱炉抽出間隔決定方法を提供することを課題とする。   In the present invention, in view of the problems of these prior arts, it is possible to optimize the heating furnace extraction interval by calculating the conveyance prediction of each rolled material in consideration of the finish entry side waiting time and performing mill pacing. It is an object of the present invention to provide a heating furnace extraction interval determination method.
本発明の請求項1に係る発明は、規定温度以下で仕上圧延を開始する制御圧延における加熱炉抽出間隔決定方法であって、仕上入側到達時の鋼板の温度を予測し、予測した仕上入側温度に基づき、前記鋼板が圧延開始まで待機しなければならない仕上入側待機時間を算出し、算出した仕上入側待機時間を考慮して搬送予測を計算し、ミルペーシングを行い最短の加熱炉抽出間隔を決定することを特徴とする加熱炉抽出間隔決定方法である。   The invention according to claim 1 of the present invention is a heating furnace extraction interval determination method in controlled rolling in which finish rolling is started at a specified temperature or less, predicting the temperature of the steel sheet when reaching the finish input side, and predicting finish input Based on the side temperature, the finish entry side waiting time that the steel sheet must wait until rolling starts is calculated, the transport prediction is calculated in consideration of the calculated finish entry side waiting time, and the shortest heating furnace that performs mill pacing It is a heating furnace extraction interval determination method characterized by determining an extraction interval.
また、本発明の請求項2に係る発明は、請求項1に記載の加熱炉抽出間隔決定方法において、前記仕上入側待機時間を、以下の式より算出することを特徴とする加熱炉抽出間隔決定方法である。   Moreover, in the invention according to claim 2 of the present invention, in the heating furnace extraction interval determination method according to claim 1, the finishing entrance standby time is calculated by the following equation. It is a decision method.
本発明は、仕上入側到達時の鋼板の温度を予測し、予測した仕上入側温度に基づき、前記鋼板が圧延開始まで待機しなければならない仕上入側待機時間を算出し、算出した仕上入側待機時間を考慮して搬送予測を計算し、ミルペーシングを行うようにしたので、最短の加熱炉抽出間隔を決定することができる。また、これにより、増産ならびに用益等のコストダウンを達成することができる。   The present invention predicts the temperature of the steel sheet when it reaches the finish input side, calculates the finish side waiting time that the steel sheet must wait until rolling starts based on the predicted finish input temperature, and calculates the calculated finish Since the conveyance prediction is calculated in consideration of the side standby time and the mill pacing is performed, the shortest heating furnace extraction interval can be determined. As a result, it is possible to achieve an increase in production and cost reduction such as profits.
本発明を適用し抽出間隔を適正化した例を示す図である。It is a figure which shows the example which applied the present invention and optimized the extraction space | interval. ミルペーシングの技術を説明する図である。It is a figure explaining the technique of a mill pacing. 時間の余裕により圧延能率低下が生じている例を示す図である。It is a figure which shows the example which the rolling efficiency fall has arisen with the allowance of time. 本発明の適用前後の比較の一例を示す図である。It is a figure which shows an example of the comparison before and behind application of this invention. 仕上入側待機時間の予測精度に関しての調査結果例を示す図である。It is a figure which shows the example of an investigation result regarding the prediction precision of finishing input side waiting time.
図2は、ミルペーシングの技術を説明する図である。図中、1は加熱炉、2はプレス、3は粗ミル、および4は仕上ミルをそれぞれ表している。熱間圧延における加熱炉1から仕上ミル4に至る設備列の一例と搬送予測線を示している。   FIG. 2 is a diagram for explaining the technique of milpacing. In the figure, 1 represents a heating furnace, 2 represents a press, 3 represents a coarse mill, and 4 represents a finishing mill. An example of the equipment line from the heating furnace 1 to the finishing mill 4 in hot rolling and a conveyance prediction line are shown.
ミルペーシングとは、例えば図1に示したように、先行材Aと当該材Bの搬送予測線を用いて、ライン上で圧延材が干渉しない最短の抽出間隔を決定して当該材Bを自動抽出する機能である。ここで、搬送予測線は、各圧延材の設定計算から算出された各設備での所要時間から決定される。搬送予測線上には干渉ポイントが複数存在し、それら全ての干渉ポイントにて干渉が生じない為に最低限必要な抽出間隔を算出して最終的な抽出間隔に設定する。   For example, as shown in FIG. 1, mill pacing automatically determines the shortest extraction interval on the line where the rolling material does not interfere with the material A by using the conveyance prediction line for the preceding material A and the material B It is a function to extract. Here, the conveyance prediction line is determined from the required time in each facility calculated from the setting calculation of each rolled material. Since there are a plurality of interference points on the transport prediction line and no interference occurs at all the interference points, the minimum extraction interval is calculated and set as the final extraction interval.
このようにミルペーシングでは、搬送予測線を抽出間隔の決定に使用している。このため、搬送予測が実績と乖離すれば、板がライン上に滞留して温度不良材が発生する、または必要以上に抽出間隔が延びて圧延能率が下がる等の不具合が生じてしまう。図3は、時間の余裕により圧延能率低下が生じている例を示す図である。先行材の待機時間(仕上ミル入側到達時に鋼板温度が規定温度以下になるまでの時間)が不明であるため、余裕をみて必要以上に長い後行材の抽出間隔をとったために、後行材の圧延までに時間の余裕が生じてしまっている例である。   Thus, in mill pacing, the conveyance prediction line is used to determine the extraction interval. For this reason, if the conveyance prediction deviates from the actual result, the plate stays on the line and the defective temperature material is generated, or the extraction interval is extended more than necessary and the rolling efficiency is lowered. FIG. 3 is a diagram illustrating an example in which a reduction in rolling efficiency occurs due to a time margin. Since the waiting time for the preceding material (the time it takes for the steel sheet temperature to fall below the specified temperature when reaching the finishing mill entry side) is unclear, the extraction interval of the succeeding material was taken longer than necessary, so that This is an example in which there is a margin of time before rolling the material.
従って、各鋼板の仕上入側待機時間を正確に考慮して搬送予測精度を向上させることが重要となる。本発明は、従来のミルペーシング技術では、搬送予測に仕上入側待機時間が反映されていないことに着目して想到したものである。   Therefore, it is important to improve the conveyance prediction accuracy by accurately considering the finishing waiting time of each steel plate. The present invention has been conceived by paying attention to the fact that the finish waiting time is not reflected in the conveyance prediction in the conventional mill pacing technique.
仕上入側待機時間を正確に予測するには、先ず加熱炉抽出〜仕上入側の温度予測を精度良く行うことが必要である。本出願人は未公開出願1に、「被圧延材の温度予測方法」と題して温度予測方法を出願している。   In order to accurately predict the finish-in side waiting time, it is first necessary to accurately perform temperature prediction from the heating furnace extraction to the finish-in side. The present applicant has applied for a temperature prediction method in the unpublished application 1 entitled “Temperature Prediction Method for Rolled Material”.
上記温度予測方法は、基本モデルとして、熱伝導方程式を差分法で解くモデルを使用し、実機データを用いて差分法で使用するパラメータを調整後、学習を行うことで、温度予測精度を向上させている。   The above temperature prediction method uses a model that solves the heat conduction equation by the difference method as a basic model, adjusts the parameters used in the difference method using actual machine data, and then performs learning to improve temperature prediction accuracy. ing.
さらに、差分モデルを集中定数系モデルと板厚方向温度分布モデルで近似することで、差分モデルと同等の温度予測精度で、かつ高速計算を可能としたものである。   Furthermore, by approximating the difference model with a lumped parameter system model and a plate thickness direction temperature distribution model, high-speed calculation is possible with the same temperature prediction accuracy as the difference model.
このように、鋼板の仕上入側温度を予測し、予測した仕上入側温度に基づいて下記の(1)式にて仕上入側待機時間を算出する。   Thus, the finish input side temperature of the steel sheet is predicted, and the finish input side standby time is calculated by the following equation (1) based on the predicted finish input side temperature.
図1は、本発明を適用し抽出間隔を適正化した例を示す図である。図3の例に本発明を適用し、図中の(1)および(2)の干渉時間に上述の(1)式にて算出した仕上入側待機時間を反映して適切に抽出間隔を計算している。   FIG. 1 is a diagram showing an example in which the present invention is applied to optimize the extraction interval. The present invention is applied to the example of FIG. 3, and the extraction time is appropriately calculated by reflecting the finishing standby time calculated by the above equation (1) in the interference times of (1) and (2) in the figure. is doing.
図4は、本発明の適用前後の比較の一例を示す図である。対象材を仕上入側待機発生材として、F1BTB(先行材がF1(図2参照)をオフしてから当該材がF1をオンするまでの時間)に関して20秒ごとに区分を設け、本発明の適用前と本発明の適用後での区分ごとの構成率を示している。   FIG. 4 is a diagram showing an example of comparison before and after applying the present invention. The target material is set as the finish-side standby generation material, and F1BTB (the time from when the preceding material turns off F1 (see Fig. 2) until the material turns on F1) is divided every 20 seconds. The composition ratio for each section before application and after application of the present invention is shown.
本発明の適用後では、本発明の適用前に比べてF1BTBが短い区分の割合が増加している事が読み取れる。そして、本発明の適用によりF1BTBの平均値は86秒から78秒となり、本発明の適用前に比べて8秒短縮できている。これにより、増産ならびに用益等のコストダウンを達成することができた。   It can be seen that after application of the present invention, the proportion of sections with short F1BTBs increased compared to before application of the present invention. By applying the present invention, the average value of F1BTB is changed from 86 seconds to 78 seconds, which is 8 seconds shorter than before applying the present invention. As a result, we were able to increase production and reduce costs such as profits.
図5は、仕上入側待機時間の予測精度に関しての調査結果例を示す図である。本発明による仕上入側予測待機時間から実績待機時間を引いた偏差をヒストグラフにして示している。偏差の1σは13.3秒であり、当初目標を上回る予測精度を達成することができた。   FIG. 5 is a diagram illustrating an example of a survey result regarding the prediction accuracy of the finish-in side waiting time. A deviation obtained by subtracting the actual standby time from the finish input side predicted standby time according to the present invention is shown as a histogram. The deviation 1σ was 13.3 seconds, and the prediction accuracy exceeded the initial target.
1 加熱炉
2 プレス
3 粗ミル
4 仕上ミル
1 Heating furnace 2 Press 3 Coarse mill 4 Finishing mill

Claims (2)

  1. 規定温度以下で仕上圧延を開始する制御圧延における加熱炉抽出間隔決定方法であって、
    仕上入側到達時の鋼板の温度を予測し、
    予測した仕上入側温度に基づき、前記鋼板が圧延開始まで待機しなければならない仕上入側待機時間を算出し、
    算出した仕上入側待機時間を考慮して搬送予測を計算し、ミルペーシングを行い最短の加熱炉抽出間隔を決定することを特徴とする加熱炉抽出間隔決定方法。
    A heating furnace extraction interval determination method in controlled rolling that starts finish rolling below a specified temperature,
    Predict the temperature of the steel plate when it reaches the finish side,
    Based on the predicted finish-side temperature, calculate the finish-side waiting time that the steel sheet must wait until rolling starts,
    A heating furnace extraction interval determination method, comprising: calculating a conveyance prediction in consideration of the calculated finishing waiting time, and performing mill pacing to determine the shortest heating furnace extraction interval.
  2. 請求項1に記載の加熱炉抽出間隔決定方法において、
    前記仕上入側待機時間を、
    以下の式より算出することを特徴とする加熱炉抽出間隔決定方法。
    In the heating furnace extraction interval determination method according to claim 1,
    The finish-side waiting time is
    A heating furnace extraction interval determination method characterized by calculating from the following equation.
JP2009052751A 2009-03-06 2009-03-06 Determination method of heating furnace extraction interval Active JP5581600B2 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016221529A (en) * 2015-05-27 2016-12-28 Jfeスチール株式会社 Rolling control device and method thereof

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JPH05154528A (en) * 1991-11-29 1993-06-22 Kawasaki Steel Corp Method for controlling temperature at inlet side in hot-continuous finish-rolling mill
JPH07290127A (en) * 1994-04-28 1995-11-07 Kawasaki Steel Corp Method for controlling mill pacing in hot rolling
JPH08193221A (en) * 1995-01-18 1996-07-30 Nisshin Steel Co Ltd Cooling method for ferritic stainless steel slab, free from cold cracking
JPH10263641A (en) * 1997-03-28 1998-10-06 Kawasaki Steel Corp Method for controlling mill paging in hot rolling line
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JPH05154528A (en) * 1991-11-29 1993-06-22 Kawasaki Steel Corp Method for controlling temperature at inlet side in hot-continuous finish-rolling mill
JPH07290127A (en) * 1994-04-28 1995-11-07 Kawasaki Steel Corp Method for controlling mill pacing in hot rolling
JPH08193221A (en) * 1995-01-18 1996-07-30 Nisshin Steel Co Ltd Cooling method for ferritic stainless steel slab, free from cold cracking
JPH10263641A (en) * 1997-03-28 1998-10-06 Kawasaki Steel Corp Method for controlling mill paging in hot rolling line
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Publication number Priority date Publication date Assignee Title
JP2016221529A (en) * 2015-05-27 2016-12-28 Jfeスチール株式会社 Rolling control device and method thereof

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