JPH11264026A - Method for determing slab withdraw time in hot rolling - Google Patents
Method for determing slab withdraw time in hot rollingInfo
- Publication number
- JPH11264026A JPH11264026A JP6687998A JP6687998A JPH11264026A JP H11264026 A JPH11264026 A JP H11264026A JP 6687998 A JP6687998 A JP 6687998A JP 6687998 A JP6687998 A JP 6687998A JP H11264026 A JPH11264026 A JP H11264026A
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- JP
- Japan
- Prior art keywords
- slab
- time
- rolling
- extraction
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、熱間圧延のスラブ
抽出時刻決定方法に係り、特に、スラブから薄板コイル
を製造する熱間圧延工場において、複数の加熱炉でそれ
ぞれ圧延可能な温度まで再加熱された後、共通の圧延ラ
インに抽出されるスラブの抽出時刻を決定して、圧延ス
ケジュール時刻を計算する際に用いるのに好適な、熱間
圧延のスラブ抽出時刻決定方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for determining a slab extraction time in hot rolling, and more particularly, to a hot rolling factory for producing a thin coil from a slab, in which a plurality of heating furnaces re-roll to a temperature capable of rolling. The present invention relates to a method for determining a slab extraction time for hot rolling, which is suitable for use in determining a slab extraction time to be extracted on a common rolling line after being heated and calculating a rolling schedule time.
【０００２】[0002]
【従来の技術】スラブから薄板コイルを製造する熱間圧
延工場（ＨＯＴとも称する）の加熱炉を用いて圧延可能
な温度（１１００〜１２００℃）までスラブを再加熱す
る。特に、図１１に示す如く、スラブを製造する前工程
の連続鋳造機（ＣＣとも称するね）２０で鋳造されたば
かりの高温スラブ１０を、テーブルや台車により短時間
で熱間圧延工場３０の加熱炉３２まで搬送して装入し、
再加熱時の燃料費を削減する、連続鋳造−熱間圧延同期
化操業（ＤＨＣＲ操業とも称する）を前提とする熱間圧
延工場では、圧延スケジュールの時刻を高精度で予測す
る必要がある。2. Description of the Related Art A slab is reheated to a temperature at which rolling can be performed (1100 to 1200 ° C.) using a heating furnace of a hot rolling mill (also referred to as HOT) for producing a thin coil from a slab. In particular, as shown in FIG. 11, a high-temperature slab 10 just cast by a continuous casting machine (also referred to as CC) 20 in a pre-process for manufacturing a slab is heated by a table or a bogie in a short time in a heating furnace of a hot rolling plant 30. Transported and charged up to 32,
In a hot rolling mill that presupposes a continuous casting-hot rolling synchronized operation (also referred to as a DHCR operation) that reduces fuel cost at the time of reheating, it is necessary to predict the time of a rolling schedule with high accuracy.
【０００３】一般に、熱間圧延工場における圧延スケジ
ュールは、仕上げミルのロール交換から、次回のロール
交換までを１つの単位（以下、サイクルと称する）とし
て取り扱う。通常、１つのサイクルは、圧延後のコイル
幅が広いものから、徐々に狭いものへ順番に圧延を行
い、ロールの段付き摩耗等による品質への影響を極力少
なくするようスケジューリングを行う。[0003] Generally, a rolling schedule in a hot rolling plant handles a process from a roll change of a finishing mill to a next roll change as one unit (hereinafter, referred to as a cycle). Normally, in one cycle, rolling is performed in order from a coil having a wide coil width after rolling to a narrow coil, and scheduling is performed so as to minimize the influence on quality due to stepped wear of the rolls.
【０００４】従来は、１つの圧延サイクル全体を単位と
して、スラブ毎に異なるスラブの装入温度と再加熱後温
度（抽出温度とも称する）に基づき、最も装入温度が低
いスラブに、サイクル全体の加熱炉からの抽出ピッチが
律速されるとして、実績ベースで作成した早見表等の基
準テーブル値を利用し、操作員が加熱炉からのスラブ抽
出能力（加熱Ｔｏｎ／Ｈｒ（Ｔ／Ｈ）とも称する）をコ
ンピュータシステムに対して入力して、１つのサイクル
の抽出開始時刻と抽出完了時刻を計算していた。[0004] Conventionally, in units of one rolling cycle as a unit, the slab having the lowest charging temperature is assigned to the slab having the lowest charging temperature based on the slab charging temperature and the temperature after reheating (also referred to as extraction temperature) for each slab. Assuming that the extraction pitch from the heating furnace is rate-determining, the operator uses a reference table value such as a quick reference table created on a performance basis, and the operator can extract the slab from the heating furnace (also referred to as heating Ton / Hr (T / H)). ) Was input to the computer system to calculate the extraction start time and extraction completion time of one cycle.
【０００５】具体的には、連続鋳造機からのスラブ出鋼
時刻を１時間単位で人が連絡し、熱間圧延スケジュール
担当者が、スラブ装入温度を粗く予測し、１サイクルの
平均装入温度と抽出温度の関係から、抽出ピッチ（Ｔ／
Ｈ）を粗く予測し、抽出開始予定時刻に、平均Ｔ／Ｈ当
りの１サイクル処理トン数を加えることによって、抽出
完了時刻を求めていた。More specifically, a person informs the time of slab tapping from the continuous casting machine in units of one hour, and a person in charge of a hot rolling schedule roughly predicts the slab charging temperature and averages one cycle of slab charging. From the relationship between temperature and extraction temperature, the extraction pitch (T /
H) is roughly estimated, and the extraction completion time is obtained by adding the tonnage per cycle per average T / H to the scheduled extraction start time.
【０００６】[0006]
【発明が解決しようとする課題】図１１に示した如く、
前記連続鋳造機２０によって製造された高温のスラブ１
０は、テーブル又は台車によって加熱炉３２の装入側ま
で搬送されるが、ＤＨＣＲ操業時には、スラブ１０が連
続鋳造機２０で、例えばトーチカットにより切断されて
から加熱炉３２に装入されるまでのトラックタイムｔが
５〜１５分程度と短く、時刻計算精度を５分程度の精度
で的中させないと、スケジュールの段階から、同期化が
図れなくなる。実操業では、更に予期せぬピッチダウン
やトラブルも加わる。As shown in FIG.
High temperature slab 1 produced by the continuous casting machine 20
0 is conveyed to the charging side of the heating furnace 32 by a table or a trolley, but during the DHCR operation, the slab 10 is cut by the continuous casting machine 20 by, for example, a torch cut and then charged into the heating furnace 32. If the track time t is as short as about 5 to 15 minutes and the time calculation accuracy is not accurate to about 5 minutes, synchronization cannot be achieved from the schedule stage. In actual operation, unexpected pitch down and troubles are added.
【０００７】ところが、前記のような従来の方法では、
ＣＣにおけるスラブ切断（トーチカット）完了時刻〜
スラブ加熱炉装入までのトラックタイムｔを反映した装
入温度予測が行われておらず、スラブ装入温度の予測が
１００℃単位で大雑把である。加熱Ｔ／Ｈは考慮して
いるが、仕上げミルにおける圧延時間が長くて抽出ピッ
チが延長する場合（いわゆる圧延時間ネック）を時刻計
算に反映できていない。加熱炉毎に装入温度及び抽出
温度が異なる場合の、各加熱炉毎の抽出Ｔ／Ｈ差が厳密
に考慮できていない等の問題点があり、特に、連続鋳造
機と熱間圧延工場が短時間で結ばれるＤＨＣＲ操業にお
いては、精度の悪さが問題となっていた。However, in the conventional method as described above,
Completion time of slab cutting (torch cutting) in CC
The charging temperature prediction reflecting the track time t until the charging of the slab heating furnace is not performed, and the prediction of the slab charging temperature is roughly in units of 100 ° C. Although the heating T / H is taken into consideration, the case where the rolling time in the finishing mill is long and the extraction pitch is extended (so-called rolling time neck) cannot be reflected in the time calculation. When the charging temperature and the extraction temperature are different for each heating furnace, there is a problem that the extraction T / H difference for each heating furnace cannot be strictly considered. In particular, the continuous casting machine and the hot rolling mill In the DHCR operation which is performed in a short time, poor accuracy has been a problem.
【０００８】なお、加熱制約と圧延制約の両方を考慮し
たものとして、特開平８−２９１３３４には、連続式加
熱炉の能力の制約から求まる加熱制御抽出間隔と、圧延
ラインの制約から求まる圧延制約抽出間隔とを比較し、
大きい方を対象スラブの抽出間隔とすると共に、加熱制
約抽出間隔で抽出するスラブは、前スラブとの間隔を取
らずに装入し、圧延制約抽出間隔で抽出するスラブは、
圧延制約抽出間隔と加熱炉制約抽出間隔の差に相当する
距離だけ、前スラブとの間隔をとって装入することが記
載されている。[0008] Assuming that both the heating constraint and the rolling constraint are taken into consideration, Japanese Patent Application Laid-Open No. Hei 8-291334 discloses a heating control extraction interval determined from the constraint of the capability of the continuous heating furnace and a rolling constraint extracted from the rolling line constraint. Compare with the extraction interval,
The larger one is set as the target slab extraction interval, and the slab extracted at the heating constraint extraction interval is inserted without taking an interval from the previous slab, and the slab extracted at the rolling constraint extraction interval is:
It is described that charging is performed at a distance from a front slab by a distance corresponding to a difference between a rolling constraint extraction interval and a heating furnace constraint extraction interval.
【０００９】又、特開平６−３３０１５１には、過去の
圧延パススケジュール実績事例を検索・修正し、知識処
理して予測した圧延能力最大時の圧延ピッチ、最大加熱
能力時の加熱ピッチ、圧延休止時間及び発生時期の予測
及び炉内スラブの休止予測による休止時期の再配置を知
識処理して予測した作業休止時間のうちの最大値を連続
加熱炉の抽出ピッチで決定することが記載されている。Japanese Patent Application Laid-Open No. Hei 6-330151 discloses that a rolling pitch at the maximum rolling capacity, a heating pitch at the maximum heating capacity, a rolling pitch at the maximum heating capacity, and a rolling pitch at the time of the maximum heating capacity, obtained by searching and correcting past rolling pass schedule actual examples and performing knowledge processing. It describes that the prediction of time and occurrence time and the relocation of the stop time based on the stop prediction of the in-furnace slab are subjected to knowledge processing to determine the maximum value of the predicted work stop time by the extraction pitch of the continuous heating furnace. .
【００１０】又、特開昭６２−１９６３２９には、製品
サイズ別に区分した熱間圧延スケジュール単位の各スラ
ブ群について、スラブ製造工程での所要製造時間を求め
ると共に、熱間圧延工程の最大加熱圧延処理能力に基づ
いて連続式加熱炉におけるスラブ抽出ピッチと最小加熱
圧延処理時間を求め、次に、該最小加熱圧延処理時間と
前記スラブ所要製造時間との差を求め、この差から連続
式加熱炉の燃料使用量及び熱間圧延装置の電力使用量の
和が最小となる群内各スラブへの分配抽出ピッチを求
め、これと前記抽出ピッチとの和を連続式加熱炉の抽出
ピッチに設定することが記載されている。Japanese Unexamined Patent Publication (Kokai) No. Sho 62-196329 discloses that the required production time in the slab production process is determined for each slab group in the unit of hot rolling schedule classified by product size, and the maximum hot rolling in the hot rolling process is performed. The slab extraction pitch and the minimum heating and rolling processing time in the continuous heating furnace are determined based on the processing capacity, and then the difference between the minimum heating and rolling processing time and the required slab manufacturing time is determined. The distribution extraction pitch to each slab in the group that minimizes the sum of the fuel consumption and the power consumption of the hot rolling device is determined, and the sum of this and the extraction pitch is set as the extraction pitch of the continuous heating furnace. It is described.
【００１１】又、特公平１−２３５２８には、スラブが
加熱炉から抽出された後の圧延スケジュールによるパス
タイムを求め、該パスタイムと該スラブの直前に加熱炉
から抽出されるスラブの圧延スケジュールによるパスタ
イムとに基づいて、該スラブの最短抽出ピッチを求める
一方、予め与えられる加熱炉の目標生産性とスラブに関
するデータとに基づいて、該スラブの基本抽出ピッチを
求め、この基本抽出ピッチでスラブを加熱炉から抽出し
たとして、ある圧延箇所のギャップタイプの余裕値の重
付け平均値を求めて、上記ある圧延箇所の圧延に対する
最短抽出ピッチと各スラブのトラッキングの制約に基づ
く固定値としての最低抽出ピッチに基づいて、スラブの
最低抽出ピッチを決定することが記載されている。In Japanese Patent Publication No. 23528/1990, a pass time based on a rolling schedule after a slab is extracted from a heating furnace is obtained, and the pass time and a rolling schedule of a slab extracted from the heating furnace immediately before the slab are obtained. While the shortest extraction pitch of the slab is determined based on the pass time according to the above, the basic extraction pitch of the slab is determined based on the target productivity of the heating furnace and data on the slab given in advance. Assuming that the slab was extracted from the heating furnace, to determine the weighted average value of the margin value of the gap type of a certain rolling spot, as the fixed value based on the shortest extraction pitch and the tracking constraint of each slab for the rolling of the certain rolling spot It is described that the minimum extraction pitch of the slab is determined based on the minimum extraction pitch.
【００１２】しかしながら、いずれにおいても、ＤＨＣ
Ｒ操業で要求されるような高精度の時刻を計算すること
ができなかった。However, in each case, DHC
It was not possible to calculate a highly accurate time required for the R operation.
【００１３】本発明は、前記従来の問題点を解決するべ
くなされたもので、ＤＨＣＲ操業に適した高精度の時刻
計算を可能とすることを課題とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and has as its object to enable highly accurate time calculation suitable for DHCR operation.
【００１４】[0014]
【課題を解決するための手段】本発明は、複数の加熱炉
でそれぞれ圧延可能な温度まで再加熱された後、共通の
圧延ラインに抽出されるスラブの抽出時刻を決定する際
に、各加熱炉に導入されるスラブ１本単位について、加
熱炉内に滞在する在炉時間及び圧延（特に仕上げ圧延）
に要する圧延時間を、品種、製品板厚、加熱炉装入温
度、再加熱後温度に基づいて求め、各加熱炉から共通の
圧延ラインに抽出されてくるスラブの抽出時刻が互いに
重複しないように、スラブ１本単位の抽出予定時刻を決
定するようにして、前記課題を解決したものである。SUMMARY OF THE INVENTION The present invention relates to a method for determining the extraction time of a slab to be extracted to a common rolling line after reheating to a temperature at which rolling can be performed in a plurality of heating furnaces. For each slab introduced into the furnace, the time spent in the furnace to stay in the heating furnace and rolling (especially finishing rolling)
The required rolling time is determined based on the product type, product thickness, heating furnace charging temperature, and temperature after reheating, so that the slab extraction times extracted from each heating furnace to a common rolling line do not overlap with each other. The above problem is solved by determining the scheduled extraction time for each slab.
【００１５】又、各加熱炉における各スラブの抽出可能
時刻を、スラブ１本単位の加熱炉装入温度、加熱能力、
在炉時間を予測し、対象サイクル内の最大在炉時間より
該サイクルの抽出能力を求め、スラブ１本単位の抽出ピ
ッチを算出することにより求めるようにしたものであ
る。Further, the extractable time of each slab in each heating furnace is determined by setting the heating furnace charging temperature, heating capacity,
The in-furnace time is predicted, the extraction capability of the cycle is determined from the maximum in-furnace time in the target cycle, and the extraction pitch is calculated for each slab.
【００１６】又、前記加熱炉装入温度を、上流側の連続
鋳造機種別、スラブ温度及びトラックタイムから求める
ようにしたものである。Further, the heating furnace charging temperature is obtained from the type of the continuous casting machine on the upstream side, the slab temperature and the track time.
【００１７】又、前記加熱能力を、品種、目標再加熱後
温度及び装入温度から求めるようにしたものである。Further, the heating capacity is determined from the kind, the target temperature after reheating, and the charging temperature.
【００１８】又、前記圧延時間を、品種、製品板厚、製
品板幅から求めるようにしたものである。Further, the rolling time is obtained from a product type, a product thickness, and a product width.
【００１９】[0019]
【発明の実施の形態】以下図面を参照して、本発明の実
施形態を詳細に説明する。Embodiments of the present invention will be described below in detail with reference to the drawings.
【００２０】本実施形態の処理手順を図１に示す。まず
ステップ１００で、スラブ１本単位に装入温度を予測す
る。具体的には、図１１に示した連続鋳造機２０でのト
ーチカットからＨＯＴ３０の加熱炉３２への装入までの
トラックタイムｔに対するスラブ温度Ｔの低下の関係
（図２に示す温度降下曲線）を、連続鋳造機２０の種別
を元に、次式により近似して推定する。FIG. 1 shows the processing procedure of this embodiment. First, at step 100, the charging temperature is predicted for each slab. Specifically, the relationship between the track time t from the torch cutting in the continuous casting machine 20 shown in FIG. 11 to the charging of the HOT 30 into the heating furnace 32 and the decrease in the slab temperature T (temperature drop curve shown in FIG. 2) Is estimated based on the following formula based on the type of the continuous casting machine 20.
【００２１】 Ｔ＝ａ0 ＋ａ1 ｔ＋ａ2 ｔ2 ＋ａ3 ｔ3 ＋ａ4 ｔ4 …（１） ここで、ａ（ｉ＝０〜４）は係数である。T = a 0 + a 1 t + a 2 t 2 + a 3 t 3 + a 4 t 4 (1) where a (i = 0 to 4) is a coefficient.
【００２２】この温度推定式（１）をオンラインコンピ
ュータ内に持たせ、連続鋳造機２０のトーチカット予定
時刻（製鋼システム時刻計算）と、加熱炉装入予定時刻
（ＨＯＴシステム時刻計算）の差から、トラックタイム
ｔを求め、スラブ１０を加熱炉３２に装入する際の装入
温度（従来は、操作員が温度降下曲線を見て１００℃き
ざみで大雑把に予測）を精度良く予測する。The temperature estimation formula (1) is stored in an online computer, and the temperature estimation formula (1) is calculated from the difference between the scheduled torch cut time of the continuous casting machine 20 (calculation of the steelmaking system time) and the estimated heating furnace charging time (calculation of the HOT system time). , The track time t is determined, and the charging temperature at the time of loading the slab 10 into the heating furnace 32 (conventionally, the operator roughly predicts the temperature drop curve at intervals of 100 ° C. by looking at the temperature drop curve).
【００２３】次いでステップ１１０に進み、スラブ１本
単位に加熱能力と在炉時間を予測する。具体的には、鋼
種や規格を含む品種、加熱炉目標抽出温度ＳＲＴ、装入
温度に基づいて加熱能力（Ｔ／Ｈ）を求めるための、図
３に示すようなテーブルをオンラインコンピュータに予
め作成して記憶しておき、これを利用して求める。Next, the routine proceeds to step 110, where the heating capacity and the furnace duration are predicted for each slab. Specifically, a table as shown in FIG. 3 for obtaining the heating capacity (T / H) based on the type including the steel type and the standard, the heating furnace target extraction temperature SRT, and the charging temperature is created in the online computer in advance. And memorize it and use this to find it.
【００２４】在炉時間は、このようにして求めた加熱能
力から計算する。即ち、図４に例示する如く、１号炉か
ら４号炉までの４基の加熱炉３２ａ、３２ｂ、３２ｃ、
３２ｄを有する熱間圧延工場の場合、操業時の加熱炉装
入口におけるスラブ温度は、図５に示す如く、２０℃前
後の常温から最大９５０℃程度の高温の範囲にわたって
変化する。一方、長さＬが３０〜３４ｍの加熱炉の装入
口から圧延ラインに抽出する温度は、１１００〜１２５
０℃の範囲である。The furnace time is calculated from the heating capacity thus obtained. That is, as illustrated in FIG. 4, four heating furnaces 32a, 32b, 32c from the first furnace to the fourth furnace,
In the case of a hot rolling mill having 32d, the slab temperature at the heating furnace inlet during operation varies from a normal temperature of about 20 ° C. to a high temperature of about 950 ° C. as shown in FIG. On the other hand, the temperature extracted from the inlet of the heating furnace having a length L of 30 to 34 m to the rolling line is 1100 to 125 m.
It is in the range of 0 ° C.
【００２５】従って、スラブ装入温度及び抽出時温度の
違いにより、同じ熱量を与えた場合、スラブが抽出時目
標温度に焼き上がるまでの時間は異なる。従って同じ時
間内に焼き上げるには、装入温度が低い方のスラブに余
分に熱量を与える必要がある。そこで本発明では、装入
温度、抽出目標温度及び鋼種を考慮した在炉時間をスラ
ブ１本単位に計算するようにしている。Therefore, depending on the difference between the slab charging temperature and the extraction temperature, when the same amount of heat is applied, the time required for the slab to bake to the extraction target temperature is different. Therefore, in order to bake in the same time, it is necessary to give extra heat to the slab having the lower charging temperature. Therefore, in the present invention, the in-furnace time in consideration of the charging temperature, the target extraction temperature, and the steel type is calculated for each slab.
【００２６】次いでステップ１２０に進み、従来と同様
に対象サイクル内の最大在炉時間より、サイクルの抽出
Ｔ／Ｈを算出する。Next, the routine proceeds to step 120, where the cycle extraction T / H is calculated from the maximum furnace time in the target cycle as in the prior art.
【００２７】次いで、ステップ１３０に進み、仕上げ圧
延能力から、スラブ１本単位の抽出ピッチを算出する。
具体的には、鋼種や規格等の品種、引張り強さＴＳ、仕
上ミル出側温度ＦＤＴ、製品板厚、板幅に応じて、予め
作成しておいた、図６に例示するようなテーブルより、
例えば１時間当りの処理本数Ｐiece／Ｈｒ（仕上げＰ／
Ｈ）を求める。Then, the program proceeds to a step 130, wherein an extraction pitch for each slab is calculated from the finish rolling capacity.
More specifically, a table such as that illustrated in FIG. 6 is prepared in advance in accordance with the type of steel and the standard, the tensile strength TS, the finish mill outlet temperature FDT, the product plate thickness, and the plate width. ,
For example, the number of pieces processed per hour Piece / Hr (finish P /
H).
【００２８】次いでステップ１４０に進み、従来と同様
にして、サイクル先頭スラブの抽出可能時刻を算出す
る。Next, the routine proceeds to step 140, where the time at which the cycle head slab can be extracted is calculated in the same manner as in the prior art.
【００２９】次いでステップ１５０に進み、サイクル２
本目以降のスラブ抽出可能時刻を算出する。Next, the routine proceeds to step 150, where the cycle 2
Calculate the slab extractable time after the first one.
【００３０】前記ステップ１００乃至１５０は、各加熱
炉単位に計算する。Steps 100 to 150 are calculated for each heating furnace.
【００３１】一方、ステップ２００で、スラブ１本単位
に仕上げ圧延時間（秒）を求める。具体的には、図７に
例示するような、加熱炉３２の出側にプレス装置３４、
Ｒ１〜Ｒ５の５スタンドからなる粗ミル３６、Ｆ１〜Ｆ
７の７スタンドからなる仕上げミル３８及びＤＣ１〜Ｄ
Ｃ３の３台のコイラ４０を有する熱間圧延工場３０にお
いて、前記仕上ミル最終スタンドＦ７の圧延速度（ｍｐ
ｍ）は、図８に示す如くであり、その圧延時間ｒは、ス
ラブ１本単位（コイル１個単位）に、仕上げ出側板厚、
仕上げ出側板幅、鋼種により、加速率、上限速度が異な
るため、長さが異なる。従って、上記仕上げ出側板厚、
仕上げ出側板幅及び鋼種に基づいて、圧延時間を時刻計
算に反映させる。On the other hand, in step 200, the finish rolling time (second) is determined for each slab. Specifically, as illustrated in FIG.
Rough mill 36 consisting of five stands R1 to R5, F1 to F
Finishing mill 38 consisting of 7 7 stands and DC1 to D
In the hot rolling mill 30 having three coilers 40 of C3, the rolling speed (mp
m) is as shown in FIG. 8, and the rolling time r is the thickness of the finished delivery side sheet per slab (each coil).
The length differs because the acceleration rate and the upper limit speed differ depending on the width of the finish-out side plate and the type of steel. Therefore, the finish exit side plate thickness,
The rolling time is reflected in the time calculation based on the width of the finish exit side plate and the steel type.
【００３２】ステップ１５０及び２００終了後、ステッ
プ３００に進み、複数加熱炉のスラブ抽出時刻が重複し
ないように差し合い、スラブ１本単位の抽出予定時刻を
決定する。具体的には、図９（Ａ）に示すような差し合
い前の２号加熱炉３２ｂの抽出可能時刻ｂ1 、ｂ2 、ｂ
3 ・・・及び対応する圧延時間ｒｂ1 、ｒｂ2 、ｒｂ3
・・・、３号加熱炉３２ｃの抽出可能時刻ｃ1 、ｃ2 、
ｃ3 ・・・及び対応する圧延時間ｒｃ1 、ｒｃ2 、ｒｃ
3 ・・・、ＤＨＣＲ操業用の４号加熱炉３２ｄの抽出可
能時刻ｄ1 、ｄ2 、ｄ3 ・・・及び対応する圧延時間ｒ
ｄ1 、ｒｄ2 、ｒｄ3 ・・・を元に、スラブ抽出時刻が
互いに重複しないように、まず、図９（Ｂ）に示す如
く、２号加熱炉と３号加熱炉の抽出時刻を差し合い、次
いで、該差し合い結果に４号加熱炉の抽出時刻を差し合
って、図７（Ｃ）に示すように最終的な各スラブの加熱
炉抽出時刻を決定する。After steps 150 and 200 are completed, the process proceeds to step 300, in which slab extraction times of a plurality of heating furnaces are determined so as not to overlap with each other, and a scheduled slab extraction time is determined. Specifically, as shown in FIG. 9 (A), the extractable times b1, b2, b of the No. 2 heating furnace 32b before the joining are performed.
3 ... and the corresponding rolling times rb1, rb2, rb3
... Extractable times c1, c2, and 3 of the No. 3 heating furnace 32c
c3... and corresponding rolling times rc1, rc2, rc
3..., Extractable times d1, d2, d3... Of the No. 4 heating furnace 32d for DHCR operation and the corresponding rolling time r
Based on d1, rd2, rd3... so that the slab extraction times do not overlap each other, first, as shown in FIG. Then, the extraction time of the No. 4 heating furnace is added to the result of the comparison, and the final heating furnace extraction time of each slab is determined as shown in FIG. 7 (C).
【００３３】このようにして、スラブ１本単位の加熱能
力及び仕上げ圧延能力を、例えばコンピュータ内に記憶
したテーブルを用いて算出し、複数の加熱炉から１つの
圧延ラインに抽出されてくるスラブの時刻を差し合い処
理により求めることによって、精度良く時刻計算を行う
ことができる。In this manner, the heating capacity and the finishing rolling capacity of each slab are calculated using, for example, a table stored in a computer, and the slab extracted from a plurality of heating furnaces into one rolling line is calculated. The time can be calculated with high accuracy by obtaining the time by the comparison process.
【００３４】[0034]
【実施例】スラブヤードオンライン制御システムにおけ
る、ある日のサイクルの差し合い結果を図１０に示す。FIG. 10 shows the result of a cycle of a certain day in the slab yard online control system.
【００３５】[0035]
【発明の効果】本発明によれば、時刻計算精度が飛躍的
に増加し、各加熱炉から抽出されるスラブの差し合いア
ンバランスが解消される。その結果、差し合いアンバラ
ンスによるロスが削減され、圧延能率が向上する。特
に、連続鋳造と熱間圧延の同期化操業における時刻不適
合の時間待ちによる温度低下が解消され、高温のまま熱
間圧延に持ち込めるホットチャージ率が向上し、加熱原
単位の削減を図れる。According to the present invention, the accuracy of time calculation is greatly increased, and the unbalance of slabs extracted from each heating furnace is eliminated. As a result, the loss due to the imbalance is reduced, and the rolling efficiency is improved. In particular, the temperature drop due to time inconsistency in the synchronized casting operation between continuous casting and hot rolling is eliminated, the hot charge rate that can be brought into hot rolling at a high temperature is improved, and the heat intensity can be reduced.
【図１】本発明の実施形態における処理手順を示す流れ
図FIG. 1 is a flowchart showing a processing procedure in an embodiment of the present invention.
【図２】本発明の原理を説明するための、連続鋳造機出
側でのスラブ切断から加熱炉装入までのトラックタイム
における温度降下曲線の一例を示す線図FIG. 2 is a diagram illustrating an example of a temperature drop curve in a track time from cutting of a slab on the output side of a continuous casting machine to charging of a heating furnace for explaining the principle of the present invention.
【図３】前記実施形態で用いられている、加熱能力を計
算するためのテーブルの例を示す線図FIG. 3 is a diagram showing an example of a table for calculating a heating capacity used in the embodiment.
【図４】本発明の適用対象である熱間圧延工場の加熱炉
の配置例を示す平面図FIG. 4 is a plan view showing an example of the arrangement of heating furnaces in a hot rolling mill to which the present invention is applied.
【図５】各加熱炉内のスラブの温度変化の例を示す線図FIG. 5 is a diagram showing an example of a temperature change of a slab in each heating furnace.
【図６】前記実施形態で用いられている、仕上げ能力を
計算するためのテーブルの例を示す線図FIG. 6 is a diagram showing an example of a table for calculating a finishing ability used in the embodiment.
【図７】本発明の対象となる熱間圧延工場の加熱炉から
コイラまでを示す工程図FIG. 7 is a process diagram showing a range from a heating furnace to a coiler of a hot rolling plant to which the present invention is applied.
【図８】仕上げミルにおける圧延時間を説明するための
線図FIG. 8 is a diagram for explaining a rolling time in a finishing mill.
【図９】前記実施形態の差し合い処理を説明する線図FIG. 9 is a diagram illustrating a joining process according to the embodiment.
【図１０】本発明の実施例における抽出ピッチ及び仕上
げ圧延時間の関係の例を示す線図FIG. 10 is a diagram showing an example of a relationship between an extraction pitch and a finish rolling time in an embodiment of the present invention.
【図１１】本発明の適用対象である連続鋳造機から熱間
圧延工場までのスラブ搬送状態を説明する斜視図FIG. 11 is a perspective view for explaining a slab conveyance state from a continuous casting machine to a hot rolling plant to which the present invention is applied.
１０…スラブ ２０…連続鋳造機（ＣＣ） ３０…熱間圧延工場（ＨＯＴ） ３２、３２ａ、３２ｂ、３２ｃ、３２ｄ…加熱炉 ３８…仕上げミル DESCRIPTION OF SYMBOLS 10 ... Slab 20 ... Continuous casting machine (CC) 30 ... Hot rolling mill (HOT) 32, 32a, 32b, 32c, 32d ... Heating furnace 38 ... Finishing mill
Claims (5)
で再加熱された後、共通の圧延ラインに抽出されるスラ
ブの抽出時刻を決定する際に、 各加熱炉に導入されるスラブ１本単位について、加熱炉
内に滞在する在炉時間及び圧延に要する時間を、品種、
製品板厚、加熱炉装入温度、再加熱後温度に基づいて求
め、 各加熱炉から共通の圧延ラインに抽出されてくるスラブ
の抽出時刻が互いに重複しないように、スラブ１本単位
の抽出予定時刻を決定することを特徴とする熱間圧延の
スラブ抽出時刻決定方法。1. A slab to be introduced into each heating furnace when determining the extraction time of a slab to be extracted to a common rolling line after being reheated to a temperature at which rolling can be performed in each of a plurality of heating furnaces. For each unit, the in-furnace time to stay in the heating furnace and the time required for rolling
It is determined based on the product thickness, heating furnace charging temperature, and temperature after reheating. The slabs extracted from each heating furnace to the common rolling line are scheduled to be extracted in units of one slab so that the extraction times do not overlap each other. A slab extraction time determination method for hot rolling, characterized in that a time is determined.
刻決定方法において、各加熱炉における各スラブの抽出
可能時刻を、スラブ１本単位の加熱炉装入温度、加熱能
力、在炉時間を予測し、対象サイクル内の最大在炉時間
より該サイクルの抽出能力を求め、スラブ１本単位の抽
出ピッチを算出することにより求めることを特徴とする
熱間圧延のスラブ抽出時刻決定方法。2. A method for determining a slab extraction time in hot rolling according to claim 1, wherein the extraction time of each slab in each heating furnace is determined by setting a heating furnace charging temperature, a heating capacity, a heating capacity of each slab. A method for determining a slab extraction time in hot rolling, wherein a time is predicted, an extraction capacity of the cycle is determined from a maximum furnace time in a target cycle, and an extraction pitch is calculated for each slab.
抽出時刻決定方法において、前記加熱炉装入温度を、上
流側の連続鋳造機種別、スラブ温度及びトラックタイム
から求めることを特徴とする熱間圧延のスラブ抽出時刻
決定方法。3. The method for determining a slab extraction time in hot rolling according to claim 1 or 2, wherein the heating furnace charging temperature is obtained from an upstream continuous casting machine type, a slab temperature and a track time. Slab extraction time determination method for hot rolling.
刻決定方法において、前記加熱能力を、品種、目標再加
熱後温度及び装入温度から求めることを特徴とする熱間
圧延のスラブ抽出時刻決定方法。4. A hot-rolling slab according to claim 2, wherein the heating capacity is determined from a product type, a target post-reheating temperature, and a charging temperature. Extraction time determination method.
刻決定方法において、前記圧延時間を、品種、製品板
厚、製品板幅から求めることを特徴とする熱間圧延のス
ラブ抽出時刻決定方法。5. The hot-rolling slab extraction time according to claim 1, wherein the rolling time is obtained from a product type, a product thickness, and a product width. Decision method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6687998A JPH11264026A (en) | 1998-03-17 | 1998-03-17 | Method for determing slab withdraw time in hot rolling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6687998A JPH11264026A (en) | 1998-03-17 | 1998-03-17 | Method for determing slab withdraw time in hot rolling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11264026A true JPH11264026A (en) | 1999-09-28 |
Family
ID=13328621
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6687998A Pending JPH11264026A (en) | 1998-03-17 | 1998-03-17 | Method for determing slab withdraw time in hot rolling |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11264026A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017104904A (en) * | 2015-11-30 | 2017-06-15 | Ｊｆｅスチール株式会社 | Heating furnace slab charging temperature prediction system |
| JP7162996B1 (en) * | 2021-08-26 | 2022-10-31 | 中外炉工業株式会社 | Heat treatment equipment |
-
1998
- 1998-03-17 JP JP6687998A patent/JPH11264026A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017104904A (en) * | 2015-11-30 | 2017-06-15 | Ｊｆｅスチール株式会社 | Heating furnace slab charging temperature prediction system |
| JP7162996B1 (en) * | 2021-08-26 | 2022-10-31 | 中外炉工業株式会社 | Heat treatment equipment |
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