JPH0230721A - Method for operating continuous annealing furnace - Google Patents

Method for operating continuous annealing furnace

Info

Publication number
JPH0230721A
JPH0230721A JP17908788A JP17908788A JPH0230721A JP H0230721 A JPH0230721 A JP H0230721A JP 17908788 A JP17908788 A JP 17908788A JP 17908788 A JP17908788 A JP 17908788A JP H0230721 A JPH0230721 A JP H0230721A
Authority
JP
Japan
Prior art keywords
roll
line speed
temp
value
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.)
Pending
Application number
JP17908788A
Other languages
Japanese (ja)
Inventor
Kuniaki Tauchi
田内 邦明
Norio Ota
範男 太田
Riichi Kaizuka
貝塚 利一
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
Kawasaki Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Ltd, Kawasaki Steel Corp filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP17908788A priority Critical patent/JPH0230721A/en
Publication of JPH0230721A publication Critical patent/JPH0230721A/en
Pending legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54Furnaces for treating strips or wire
    • C21D9/56Continuous furnaces for strip or wire
    • C21D9/562Details
    • C21D9/563Rolls; Drums; Roll arrangements

Abstract

PURPOSE:To prevent meandering of a steel strip in a furnace by predicting temp. distribution of roll in future from thickness, width and line speed of the steel strip, temp. in the annealing furnace and temp. of helper roll and adjusting the line speed of the steel strip from the predicted value. CONSTITUTION:The steel strip 1 is passed in the continuous annealing furnace composing of heating zone 2, soaking zone 3 and cooling zones 4, 5 while winding to the helper rolls 6 to execute the annealing treatment. In this case, the thickness 14, width 15 and line speed of the steel strip, the temp. in the heating zone 2, the temp. distribution to axial direction of the helper roll 6 (center part temp. TRC, edge part temp. TRE) are actually measured. Roll temp. difference DELTATR=TRE-TRC is calculated from the actual measured value with the computing element 11. In case DELTATR is lower than the limited value of the temp. difference to the roll axial direction corresponding to the limited value of the heat crown in the helper roll 6, the present line speed is maintained. In case DELTATR is more than the limited value, the line speed is adjusted so as to become less than the limited value of the temp. difference to the roll axial direction, to prevent the steel strip from meandering.

Description

【発明の詳細な説明】 [産業上の利用分野] 本発明は連続焼鈍炉の運転方法に関し、特に鋼板の蛇行
を起こさせないラインスピードを設定するのに適用され
る連続焼鈍炉の運転方法に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of operating a continuous annealing furnace, and particularly to a method of operating a continuous annealing furnace that is applied to setting a line speed that does not cause meandering of a steel plate.

[従来の技術] 連続焼鈍炉においては、第2図に示すように、鋼板1を
加熱帯2.均熱帯3、冷却帯4,5の中を複数個のヘル
パーロール6に巻きかけられ、走行させることにより焼
鈍が行なわれる。
[Prior Art] In a continuous annealing furnace, as shown in FIG. 2, a steel plate 1 is placed in a heating zone 2. Annealing is performed by winding the material around a plurality of helper rolls 6 and running it in the soaking zone 3 and the cooling zones 4 and 5.

加熱体2においてはラジアントチューブ7を配設して該
チューブ7の中の熱料ガスを燃焼させてラジアントチュ
ーブ7を加熱し、その輻射熱によってラジアントチュー
ブ7列の間を上下に通過する鋼板1を加熱する。また図
示していないが板厚、板幅、ラインスピードに対して目
標焼鈍温度が得られるように加熱帯炉温設定値を決め、
炉温検出値が設定値に等しくなるように燃料ガス流量を
調節している。
In the heating body 2, a radiant tube 7 is disposed, and the heating gas in the tube 7 is burned to heat the radiant tube 7, and the radiant heat is used to heat the steel plate 1 passing vertically between the seven rows of radiant tubes. Heat. Although not shown, the heating zone furnace temperature setting value is determined so that the target annealing temperature can be obtained for the plate thickness, plate width, and line speed.
The fuel gas flow rate is adjusted so that the detected furnace temperature value is equal to the set value.

またヘルパーロール6は第3図に示すような初期クラウ
ンの付与された形状となっており、鋼板1の端部から中
央部へ働く力(自己センタリング力)をもたせ、鋼板1
の安定走行を可能にするよう考慮されている。
Further, the helper roll 6 has a shape with an initial crown as shown in FIG.
It is designed to enable stable running.

なお第3図においてTHEは鋼板端部におけるロール温
度、TRCは中央部のロール温度を示す。
In FIG. 3, THE indicates the roll temperature at the edge of the steel plate, and TRC indicates the roll temperature at the center.

ところが加熱帯2内のヘルパーロール6の軸方向温度分
布においては鋼板1と接している中央部では鋼板温度が
低いため低く、端部ではラジアントチューブ7に加熱さ
れて高くなる。したがってこの温度差に伴なって生じる
熱膨張差でヘルパーロール6にいわゆるサーマルクラウ
ンが発生する。
However, in the axial temperature distribution of the helper roll 6 in the heating zone 2, the temperature is low at the center where it is in contact with the steel plate 1 because the steel plate temperature is low, and it is high at the ends because it is heated by the radiant tube 7. Therefore, a so-called thermal crown occurs in the helper roll 6 due to the difference in thermal expansion caused by this temperature difference.

すなわち運転中は初期クラウンとサーマルクラウンの差
のロールクラウン(これをトータルクラウンと称す。)
の状態で運転されることになる。つまりトータルクラウ
ンΔDは(1)式のように表わすことができる。
In other words, during operation, the roll crown is the difference between the initial crown and the thermal crown (this is called the total crown).
It will be operated under the following conditions. In other words, the total crown ΔD can be expressed as in equation (1).

ΔD−△Di −ΔDt           ・・・
(1)−ΔDi −β×DR×ΔT、        
・・・(1)′−ΔD1−βX DRX (TRE  
TRc ) ・”(1)’ここでΔD1 =初期クラウ
ン △Dt:サーマルクラウン β :熱膨張率 DR二ロール外径 △’rR=THE  ’r、C また従来の運転で採用されているラインスピード設定方
法は、たとえば、特公昭59−52937号公報に示さ
れる。すなわち、ストリップ条件(板厚、板幅、焼鈍温
度、均熱時間、冷却終了温度、冷却速度)が与えられた
際最大生産量運転を行なうためプロセス計算機を用いて
各炉において設備能力上可能な最大ラインスピードを求
め、それら各々の最小値にラインスピードを設定する方
法が示されている。
ΔD−ΔDi−ΔDt...
(1) −ΔDi −β×DR×ΔT,
...(1)'-ΔD1-βX DRX (TRE
TRc) ・"(1)'Here, ΔD1 = Initial crown ΔDt: Thermal crown β: Coefficient of thermal expansion DR Two-roll outer diameter Δ'rR=THE 'r, C Also, the line speed setting adopted in conventional operation The method is shown, for example, in Japanese Patent Publication No. 59-52937.That is, when strip conditions (plate thickness, plate width, annealing temperature, soaking time, cooling end temperature, cooling rate) are given, maximum production capacity operation is possible. In order to do this, a method is shown in which a process computer is used to find the maximum line speed possible in each furnace based on the equipment capacity, and the line speed is set to the minimum value for each of them.

[発明が解決しようとする課題] ところでもしトータルクラウン△Dが下限値DH(定数
)以下になれば、前述の自己センタリング力がなくなり
、鋼板の安定走行ができなくなる。つまり横ずれ一蛇行
一炉壁との接触→破断という事態となり、運転停止に至
る。
[Problems to be Solved by the Invention] By the way, if the total crown ΔD becomes less than the lower limit value DH (constant), the above-mentioned self-centering force disappears, and stable running of the steel plate becomes impossible. In other words, a situation of lateral slipping, meandering, contact with the reactor wall, and rupture occurs, leading to the shutdown of the reactor.

安定走行可能なトータルクラウンΔDは(2)式で示さ
れる。言いかえれば、鋼板を安定走行させるには(4)
式を満足するヘルパーロール軸方向温度差限界値ΔTH
aaxを用いた(3)式を満足する必要がある。
The total crown ΔD that allows stable running is expressed by equation (2). In other words, to make the steel plate run stably (4)
Helper roll axial temperature difference limit value ΔTH that satisfies the formula
It is necessary to satisfy equation (3) using aax.

ΔD≧D H−(2) ΔTR≦ΔT Rl1ax             
  ・” (3)ΔD1−β×DR×ΔTH1aX−D
o   −(4)特願昭60−228580においては
、前述のように、設備能力から決まる最大ラインスピー
ドを算出した後、さらにΔTRを演算して(3)式の判
定を行ない(3)式を満足しなければ満足するまでライ
ンスピード設定値をあらかじめ下方修正する方法が提案
されている。
ΔD≧D H-(2) ΔTR≦ΔT Rl1ax
・” (3) ΔD1-β×DR×ΔTH1aX-D
o - (4) In Japanese Patent Application No. 60-228580, as mentioned above, after calculating the maximum line speed determined from the equipment capacity, ΔTR is further calculated and the equation (3) is determined. A method has been proposed in which, if the line speed setting is not satisfied, the line speed setting value is adjusted downward in advance until the line speed is satisfied.

ところが、対象コイル通板前の推定計算であるためΔT
Rの演算誤差や不測の外乱などのため蛇行発生の懸念が
ある。したがって実際のロール温度分布を監視する必要
がある。
However, since this is an estimation calculation before threading the target coil, ΔT
There is a concern that meandering may occur due to calculation errors in R or unexpected disturbances. Therefore, it is necessary to monitor the actual roll temperature distribution.

また特開昭60−181242公報においては、ヘルパ
ーロール軸方向温度分布を実測し、ロール温度差が限界
を越えた際にはラインスピードを変更する方法が示され
ている。
Further, Japanese Patent Application Laid-Open No. 181242/1983 discloses a method of actually measuring the temperature distribution in the axial direction of a helper roll and changing the line speed when the roll temperature difference exceeds a limit.

ところがロール温度差ΔT、が一度(3)式を満足しな
くなれば、蛇行は発生し、発生後は急激かつ大きくライ
ンスピードを下げなければならないので、生産性を損な
うという問題点があった。
However, once the roll temperature difference ΔT no longer satisfies equation (3), meandering will occur, and after the meandering occurs, the line speed must be rapidly and significantly reduced, resulting in a problem of loss of productivity.

本発明の課題は、上記従来の問題点を解消することがで
きる連続焼鈍炉の運転方法を提供することである。
An object of the present invention is to provide a method of operating a continuous annealing furnace that can solve the above-mentioned conventional problems.

[課題を解決するための手段] 本発明による連続焼鈍炉の運転方法は、連続焼鈍炉の運
転方法において、鋼板厚、鋼板幅、ラインスピード、炉
内温度、およびロール温度分布の各実測値から将来のロ
ール温度分布を予測計算し、ロール中心部の温度の予測
値と鋼板端部の温度との温度差予測値がロールのヒート
クラウン限界値に対応するロール軸方向温度差限界値未
満の場合には現状のラインスピードを保持し、前記ロー
ル軸方向温度差限界値以上の場合には前記温度差予測値
が前記ロール軸方向温度差限界値以下となるようにライ
ンスピードを設定変更することを特徴とする。
[Means for Solving the Problems] The continuous annealing furnace operating method according to the present invention is based on actual measurements of steel plate thickness, steel plate width, line speed, furnace temperature, and roll temperature distribution. The future roll temperature distribution is predicted and calculated, and if the predicted temperature difference between the temperature at the center of the roll and the temperature at the edge of the steel plate is less than the roll axial temperature difference limit corresponding to the roll heat crown limit. The current line speed is maintained, and if the roll axial temperature difference limit value is exceeded, the line speed setting is changed so that the predicted temperature difference value is equal to or less than the roll axial temperature difference limit value. Features.

[作 用] 本発明方法によれば、例えば、第1図に示す演算フロー
を所定の周期でくり返す。すなわち(1)板厚、板幅、
ラインスピード、炉内温度および、ヘルパーロール軸方
向温度分布を実l1111する。
[Operation] According to the method of the present invention, for example, the calculation flow shown in FIG. 1 is repeated at a predetermined period. In other words, (1) plate thickness, plate width,
The line speed, furnace temperature, and helper roll axial temperature distribution are measured.

(2)  これら実測値から将来(1時点あるいはN時
点後)ロール温度差△TRを予測計算する。
(2) Predictably calculate the roll temperature difference ΔTR in the future (after time 1 or time N) from these measured values.

(3)△TR予測値が(3)式を満足するがどうが判定
する。
(3) Determine whether the ΔTR predicted value satisfies equation (3).

(4)満足していれば現状のラインスピードを保持する
(4) If satisfied, maintain the current line speed.

(5)満足していなければ△TR予測値と限界値を用い
て(5)式および(6)式からラインスピードを再設定
する。
(5) If not satisfied, the line speed is reset from equations (5) and (6) using the ΔTR predicted value and limit value.

△LSs−(△TR予測値−△THmax)LS3−L
S−△LSs         ・・・(6)小温度の
影響係数 △LSs ニラインスピード変更量 LS   :現状のラインスピード LSs   :新しいラインスピード設定値いは実験的
に求めておけばよい。
△LSs-(△TR predicted value-△THmax) LS3-L
S-ΔLSs (6) Small temperature influence coefficient ΔLSs Second line speed change amount LS: Current line speed LSs: New line speed setting value may be determined experimentally.

またロール温度ΔTRの予測計算はたとえば次のように
行なう。ロールを軸方向にn分割し、第i分割区分にお
けるロール温度をTR1とする。
Further, the predicted calculation of the roll temperature ΔTR is performed, for example, as follows. The roll is divided into n parts in the axial direction, and the roll temperature in the i-th division is set to TR1.

(対応した場所にロール温度分布測定用の熱電対を設置
する。)1時点光の予測の場合について説明する。
(A thermocouple for measuring roll temperature distribution is installed at a corresponding location.) A case of predicting light at one point in time will be explained.

現在をに時点とするとに+1時点のロール温度Tni(
K+1)は(7)式から求まる。
Letting the current point be the point in time, the roll temperature Tni (
K+1) can be found from equation (7).

TR1(K+1 ) −Ct TRi  (K )+C
I  TRill(K)十C2TRi−1(K)+C3
Tz (K)+C4LS(K)XD(K)(1−1〜n
) ・・・(7) ここでTz(K):に時点における炉内温度実測値Tn
 1(K)、 TR1+1(K)、 TR1−1(K)
、  :に時点における第i、  ill、  i−1
分割区分のロール温度実測値 LS(K)   ニラインスピード実測値D(K)  
  :に時点における板厚、W(K)   :に時点に
おける板幅、01〜C4:定数 TRj(K+1)を板端部の分割区分jにおけるロール
温度予測値とする(板幅によりjは変る)(板幅により
jは変る)と、 THE  (K+1 ) =TRj(K+1)、またT
RC(K+1 ) = T Rr(K+1)とするとロ
ール温度差予測値は△TR(K+1 ) −TRj(K
+l)  TR1(K+1 )で表わされる。
TR1(K+1)-Ct TRi(K)+C
I TRill (K) 10 C2 TRi-1 (K) + C3
Tz (K)+C4LS(K)XD(K)(1-1~n
) ...(7) Here, Tz (K): Actual temperature value Tn in the furnace at the time of
1(K), TR1+1(K), TR1-1(K)
, : the i-th, ill, i-1 at time point
Actual measurement value of roll temperature of division section LS (K) Actual measurement value of Ni-line speed D (K)
: Plate thickness at time, W(K) : Plate width at time, 01 to C4: Let constant TRj (K+1) be the predicted roll temperature value at division section j of the plate end (j changes depending on the plate width) (j changes depending on the plate width), THE (K+1) = TRj (K+1), and T
If RC(K+1) = T Rr(K+1), the predicted roll temperature difference value is △TR(K+1) −TRj(K
+l) TR1(K+1).

N時点先の予測であれば1時点光以降の(7)式のロー
ル温度TR1(K)、 TR1+1(K)、 TR1−
1(K)には前回計算値を代入することにより(7)式
をN回くり返す。ただしロール温度以外はに時点の実測
値を代入する。
If the prediction is for N time points ahead, the roll temperature of equation (7) after the 1st time point is TR1 (K), TR1+1 (K), TR1-
Equation (7) is repeated N times by substituting the previously calculated value into 1(K). However, except for the roll temperature, substitute the actual measured values at the time.

またラインスピード変更量△Lssの算出法としては前
述のように影響係数を用いる方法の他に次の方法が考え
られる。
Further, as a method for calculating the line speed change amount ΔLss, in addition to the method using the influence coefficient as described above, the following method can be considered.

(1)  (8)式のように△TR予Ml値と△TRf
f1aXの差の定数倍(K)で与える。
(1) As shown in equation (8), △TR pre-Ml value and △TRf
It is given as a constant multiple (K) of the difference in f1aX.

△LSS −K X (△TR予測値−ΔTHmax)
・・・(8) (2)  (9)式のように一定値(ΔLSs c )
にする。
△LSS −K X (△TR predicted value − ΔTHmax)
...(8) (2) A constant value (ΔLSs c ) as shown in equation (9)
Make it.

△LSs−ΔL S s c        ・=(9
)また△LSsを算出するのではなくしssとして次の
ように与える方法が考えられる。
△LSs−ΔLSs c ・=(9
) Also, instead of calculating ΔLSs, the following method may be considered as giving it as ss.

(1)(10)式のように一定値(LSsc)を与える
(1) A constant value (LSsc) is given as in equation (10).

LSs =LSs c          −(10)
(2)運転条件とロール温度差△TRとの静的関係を表
わす。
LSs = LSs c - (10)
(2) Expresses the static relationship between operating conditions and roll temperature difference ΔTR.

(11)式を用いてD−D(K) 、W−W(K)Tz
−Tz(K)を与えたとき△TR−△TR111aXを
満足するLSつまりLS’を算出し、LSs−LS′と
じて与える。
Using equation (11), D-D(K), W-W(K)Tz
-Tz(K), calculate LS, that is, LS' that satisfies ΔTR-ΔTR111aX, and give it as LSs-LS'.

△TR−f (LS、D、W%Tz)・・・(11)(
3)第4図に示すようなラインスピード変更パターンに
従ってLSsを与える。ただしく11)式の演算によっ
て上記LS’を求めておかねばならない。
△TR-f (LS, D, W%Tz)...(11)(
3) Provide LSs according to the line speed change pattern as shown in FIG. However, the above LS' must be obtained by calculating equation 11).

なお上述の定数(K、△LSSC% LSSC)や第4
図に示゛す定数LS1、tl、△LS/△t(時間勾配
)はあらかじめ実験的に求めておく。
In addition, the above-mentioned constant (K, △LSSC% LSSC) and the fourth
The constants LS1, tl, and ΔLS/Δt (time gradient) shown in the figure are determined experimentally in advance.

[実施例] 第2図は本発明方法を実施するのに用いられる装置の一
例を示す図で、1は鋼板、2加熱帯、3は均熱帯、4お
よび5は冷却帯、6はヘルパーロール、7はラジアント
チューブ、8はプライドルロール、9はラインスピード
制御器、10はラインスピード検出器、11はラインス
ピード設定値演算器、12は炉内温度検出器、13はヘ
ルパーロール軸方向温度分布検出器(軸方向に多点の熱
電対を設置)、14.15は現在通板中コイルの板厚、
板幅である。
[Example] Fig. 2 is a diagram showing an example of an apparatus used to carry out the method of the present invention, in which 1 is a steel plate, 2 is a heating zone, 3 is a soaking zone, 4 and 5 are cooling zones, and 6 is a helper roll. , 7 is a radiant tube, 8 is a priddle roll, 9 is a line speed controller, 10 is a line speed detector, 11 is a line speed setting value calculator, 12 is a furnace temperature detector, 13 is a helper roll axial temperature distribution Detector (multi-point thermocouples installed in the axial direction), 14.15 is the thickness of the coil currently being threaded,
It is the board width.

すなわち、14,15.10.12.13で示す各部か
ら得た板厚、板幅、ラインスピード、炉内温度、ロール
温度分布の各実測値からラインスピード設定値演算器1
1によって第1図に示す演算を行ない、必要ならば蛇行
限界内のラインスピードを求めてラインスピードを設定
変更する。
That is, the line speed setting value calculator 1 is calculated from each actual measurement value of plate thickness, plate width, line speed, furnace temperature, and roll temperature distribution obtained from each part shown in 14, 15, 10, 12, and 13.
1, the calculation shown in FIG. 1 is performed, and if necessary, the line speed within the meandering limit is determined and the line speed setting is changed.

なお対象コイルごとにあらかじめ設定するラインスピー
ドの決定法は、たとえば前述の特公昭59−52937
公報又は特願昭60−228580による方法を用いれ
ばよい。16はこのようにして別途演算されたラインス
ピード設定値である。対象ロールは経験的に知られた最
も蛇行を発生しやすいロールにしておけばよい。
The method for determining the line speed to be set in advance for each target coil is, for example, the method described in the aforementioned Japanese Patent Publication No. 59-52937.
The method disclosed in the publication or Japanese Patent Application No. 60-228580 may be used. 16 is a line speed setting value separately calculated in this manner. The target role may be the role known from experience that is most likely to cause meandering.

また図示していないが、ラインスピード設定値演算器1
1によりラインスピードを変更した場合には、焼鈍温度
が変化しないようにLSsに応じて炉温制御系の設定値
を変更する。
Although not shown, line speed setting value calculator 1
When the line speed is changed according to 1, the set value of the furnace temperature control system is changed according to LSs so that the annealing temperature does not change.

なお、上記本発明の一実施例では、ロール温度差を限界
値以下とするためのラインスピード変更量を、ロール温
度差予測値と温度差限界値の関数として算出し、ライン
スピードを設定変更するものについて説明したが、例え
ば、あらかじめ決められたパターンすなわち一定値まで
減速し、一定時間保持し一定の時間関数でロール温度差
が前記限界値に等しくなるように、演算されたラインス
ピードにまで増速するラインスピード設定変更パターン
にしたがってラインスピードを設定変更するようにして
もよい。
In the above-mentioned embodiment of the present invention, the line speed change amount for making the roll temperature difference below the limit value is calculated as a function of the roll temperature difference predicted value and the temperature difference limit value, and the line speed setting is changed. As explained above, for example, the line speed may be decelerated to a predetermined pattern, that is, a constant value, maintained for a certain period of time, and then increased to a calculated line speed such that the roll temperature difference becomes equal to the limit value as a function of a certain time. The line speed setting may be changed according to an increasing line speed setting change pattern.

[発明の効果] 本発明によれば、鋼板の蛇行を起こさせないラインスピ
ード設定変更を自動的に行ない、連続安定運転が可能と
なる。さらに蛇行限界内での最大生産量運転および所定
の品質の焼鈍を行なうことができる。
[Effects of the Invention] According to the present invention, line speed settings that do not cause meandering of the steel plate are automatically changed, and continuous stable operation is possible. Furthermore, maximum production capacity operation within meandering limits and annealing of a predetermined quality can be carried out.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明方法の1例を示すフローチャート図、第
2図は本発明方法を実施するのに用いる装置の一例の構
成を示す図、第3図はヘルパーロールの正面図、第4図
は蛇行を予1tFI検知したときのラインスピード変更
パターンの一例を示す図である。 10・・・ラインスピード検出器、11・・・ラインス
ピード設定値演算器、13・・・ヘルパーロール軸方向
温度分布検出器。 第1図 第 図
FIG. 1 is a flowchart showing an example of the method of the present invention, FIG. 2 is a diagram showing the configuration of an example of the apparatus used to carry out the method of the present invention, FIG. 3 is a front view of the helper roll, and FIG. 4 FIG. 2 is a diagram showing an example of a line speed change pattern when meandering is detected in advance at 1tFI. 10... Line speed detector, 11... Line speed setting value calculator, 13... Helper roll axial temperature distribution detector. Figure 1 Figure

Claims (1)

【特許請求の範囲】[Claims] 連続焼鈍炉の運転方法において、鋼板厚、鋼板幅、ライ
ンスピード、炉内温度、およびロール温度分布の各実測
値から将来のロール温度分布を予測計算し、ロール中心
部の温度の予測値と鋼板端部の温度との温度差予測値が
ロールのヒートクラウン限界値に対応するロール軸方向
温度差限界値未満の場合には現状のラインスピードを保
持し、前記ロール軸方向温度差限界値以上の場合には前
記温度差予測値が前記ロール軸方向温度差限界値以下と
なるようにラインスピードを設定変更することを特徴と
する連続焼鈍炉の運転方法。
In the operating method of a continuous annealing furnace, the future roll temperature distribution is predicted and calculated from the actual measured values of steel plate thickness, steel plate width, line speed, furnace temperature, and roll temperature distribution, and the predicted value of the temperature at the center of the roll and the steel plate are calculated. If the predicted temperature difference with the end temperature is less than the roll axial temperature difference limit corresponding to the roll heat crown limit, the current line speed is maintained and the roll axial temperature difference is greater than or equal to the roll axial temperature difference limit. A method of operating a continuous annealing furnace, characterized in that the line speed is changed so that the predicted temperature difference value is equal to or less than the limit value of the temperature difference in the axial direction of the rolls.
JP17908788A 1988-07-20 1988-07-20 Method for operating continuous annealing furnace Pending JPH0230721A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17908788A JPH0230721A (en) 1988-07-20 1988-07-20 Method for operating continuous annealing furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17908788A JPH0230721A (en) 1988-07-20 1988-07-20 Method for operating continuous annealing furnace

Publications (1)

Publication Number Publication Date
JPH0230721A true JPH0230721A (en) 1990-02-01

Family

ID=16059849

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17908788A Pending JPH0230721A (en) 1988-07-20 1988-07-20 Method for operating continuous annealing furnace

Country Status (1)

Country Link
JP (1) JPH0230721A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2876709A1 (en) * 2004-10-14 2006-04-21 Kappa Thermline Soc Par Action METHOD AND DEVICE FOR QUALITATIVE AND QUANTITATIVE IMPROVEMENT OF PRODUCTION IN A VERTICAL PROCESSING FURNACE FOR STEEL OR ALUMINUM BANDS
CN102373328A (en) * 2010-08-24 2012-03-14 宝山钢铁股份有限公司 Load balance control method of motor of furnace roller at uniform heating section of heating furnace of continuous annealing unit
CN104451118A (en) * 2014-10-27 2015-03-25 燕山大学 Forecasting method for segmental evolution of strip steel shape in continuous annealing process

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6315331A (en) * 1986-07-07 1988-01-22 Hitachi Ltd Data base processing method
JPS63162819A (en) * 1986-12-25 1988-07-06 Mitsubishi Heavy Ind Ltd Line speed setting method in continuous annealing furnace

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6315331A (en) * 1986-07-07 1988-01-22 Hitachi Ltd Data base processing method
JPS63162819A (en) * 1986-12-25 1988-07-06 Mitsubishi Heavy Ind Ltd Line speed setting method in continuous annealing furnace

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2876709A1 (en) * 2004-10-14 2006-04-21 Kappa Thermline Soc Par Action METHOD AND DEVICE FOR QUALITATIVE AND QUANTITATIVE IMPROVEMENT OF PRODUCTION IN A VERTICAL PROCESSING FURNACE FOR STEEL OR ALUMINUM BANDS
CN102373328A (en) * 2010-08-24 2012-03-14 宝山钢铁股份有限公司 Load balance control method of motor of furnace roller at uniform heating section of heating furnace of continuous annealing unit
CN104451118A (en) * 2014-10-27 2015-03-25 燕山大学 Forecasting method for segmental evolution of strip steel shape in continuous annealing process

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