JPH09176746A - Method for controlling sheet temperature in continuous annealing furnace - Google Patents

Method for controlling sheet temperature in continuous annealing furnace

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Publication number
JPH09176746A
JPH09176746A JP33474195A JP33474195A JPH09176746A JP H09176746 A JPH09176746 A JP H09176746A JP 33474195 A JP33474195 A JP 33474195A JP 33474195 A JP33474195 A JP 33474195A JP H09176746 A JPH09176746 A JP H09176746A
Authority
JP
Japan
Prior art keywords
target
temperature
furnace
strip
plate
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
JP33474195A
Other languages
Japanese (ja)
Inventor
Hiroyasu Shigemori
弘靖 茂森
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
Original Assignee
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 Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Priority to JP33474195A priority Critical patent/JPH09176746A/en
Publication of JPH09176746A publication Critical patent/JPH09176746A/en
Pending legal-status Critical Current

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  • Control Of Heat Treatment Processes (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

PROBLEM TO BE SOLVED: To improve the producing efficiency of a steel strip and furthermore to prevent deterioration in the consumption unit of fuel. SOLUTION: At the time of reducing the sheet passing speed, the speed reduction starting time and speed reduction keeping time ΔT are previously estimated. In the case the speed reduction keeping time T is shorter than the previously set time ΔT, the objective sheet temp. is set to the one higher than the controlling objective value Ts0 within the range not exceeding the upper limit value Ts1 of the controlling range, and in the case the speed reduction keeping time T is longer than the set value ΔT, the objective sheet temp. is set to the controlling objective value Ts0 .

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は、板厚、板幅或いは
加熱炉の出側での目標板温が異なる鋼帯を前記加熱炉に
連続的に通板して連続焼鈍を行うにあたって、前記加熱
炉の炉温及び前記鋼帯の通板速度を制御することにより
該加熱炉の出側での板温を制御するようにした連続焼鈍
炉の板温制御方法に関する。
TECHNICAL FIELD The present invention relates to continuous annealing by continuously passing steel strips having different sheet thicknesses, sheet widths or target sheet temperatures at the exit side of the heating furnace through the heating furnace. The present invention relates to a plate temperature control method for a continuous annealing furnace in which the plate temperature on the outlet side of the heating furnace is controlled by controlling the furnace temperature of the heating furnace and the plate passing speed of the steel strip.

【0002】[0002]

【従来の技術】加熱炉の出側の板温は製品の品質に大き
な影響を及ぼすことから高精度の板温制御が要求される
が、かかる要求に応える従来の連続焼鈍炉の板温制御方
法としては、例えば特開平5−214448号公報や特
開平5−17830号公報に記載のものが知られてい
る。
2. Description of the Related Art Since the plate temperature on the outlet side of a heating furnace has a great influence on the quality of products, high-precision plate temperature control is required. Conventional plate temperature control methods for continuous annealing furnaces meet such requirements. For example, those described in JP-A-5-214448 and JP-A-5-17830 are known.

【0003】前者は、オペレータが経験等により判断し
ていた通板速度制御の判断基準を所定条件化して記憶し
たエキスパートシステムから安定通板が確保できる通板
速度の上下限値を得、該通板速度の上限値で運転したと
きに加熱炉の出側での板温が目標板温になる炉温値をモ
デル式を用いて求めてその値を炉温設定値とすることに
より加熱炉の出側での板温を制御するようにしたもので
ある。一方、後者は、通板性に関する特徴を記憶した知
識データベースから安定通板が確保できる通板速度操作
量を得、該通板速度操作量で運転したときに加熱炉の出
側での板温が目標板温になる炉温値をモデル式を用いて
求めてその値を炉温設定値とすることにより加熱炉の出
側での板温を制御するようにしたものである。
The former obtains the upper and lower limit values of the strip passing speed at which stable strip passing can be secured from an expert system that stores the judgment criteria of the strip passing speed control, which the operator has judged based on his experience, for a predetermined condition and stores them. When operating at the upper limit of the plate speed, the plate temperature at the exit side of the heating furnace becomes the target plate temperature.The furnace temperature value is obtained using a model formula and that value is set as the furnace temperature set value. The plate temperature on the delivery side is controlled. On the other hand, the latter obtains the strip running speed operation amount that can secure stable strip running from the knowledge database that stores the features related to strip running property, and when operating at the strip running speed operation amount, the plate temperature at the exit side of the heating furnace is obtained. The plate temperature on the outlet side of the heating furnace is controlled by obtaining the furnace temperature value that becomes the target plate temperature using a model formula and setting that value as the furnace temperature set value.

【0004】かかる連続焼鈍においては、通板速度を減
速して加熱炉の出側で鋼帯のトリミングやカットが行わ
れるが、この場合、図8に示すように、上述したエキス
パートシステムや知識データベースによって減速開始時
刻及び減速持続時間を前もって予測し、減速持続中に目
標板温が管理目標値になるように炉温を十分に下げて設
定する。また、減速要因が解除された場合には、目標板
温を管理目標値に維持しつつ通板速度及び炉温を上昇さ
せて元の状態に復帰させる。因みに、目標板温の管理範
囲の下限値は品質上の最低焼鈍保証温度であるが、上限
値は燃料流量等から算出される安定操業上の最大許容値
であって特に品質に影響を及ぼすものではない。
In such continuous annealing, the strip speed is reduced to trim or cut the steel strip on the outlet side of the heating furnace. In this case, as shown in FIG. 8, the expert system and the knowledge database described above are used. The deceleration start time and deceleration duration are predicted in advance, and the furnace temperature is set sufficiently low so that the target plate temperature becomes the control target value during deceleration duration. Further, when the deceleration factor is released, the plate speed and the furnace temperature are increased while maintaining the target plate temperature at the management target value, and the original state is restored. By the way, the lower limit of the target plate temperature control range is the guaranteed minimum annealing temperature for quality, but the upper limit is the maximum allowable value for stable operation calculated from the fuel flow rate etc. is not.

【0005】[0005]

【発明が解決しようとする課題】ところで、鋼帯の生産
効率の観点からは減速要因が解除されたときに通板速度
及び炉温を速やかに復帰させて定常運転を再開すること
が望まれるが、かかる従来の連続焼鈍炉の板温制御方法
においては、特に大規模な炉では炉温上昇時の熱慣性に
より炉温の応答性が非常に悪いため、通板速度の応答性
もそれに伴って悪くなり、鋼帯の生産効率を向上させる
妨げになっている。
From the viewpoint of the production efficiency of steel strips, it is desirable that the strip running speed and the furnace temperature be promptly restored to resume the steady operation when the deceleration factor is released. In the conventional continuous annealing furnace plate temperature control method, particularly in a large-scale furnace, the response of the furnace temperature is very poor due to the thermal inertia when the temperature of the furnace rises. It is becoming worse and hindering the improvement of steel strip production efficiency.

【0006】本発明はかかる不都合を解消するためにな
されたものであり、鋼帯の生産効率を向上を図ることが
できると共に、燃料原単位の悪化を防止することができ
る連続焼鈍炉の板温制御方法を提供することを目的とす
る。
The present invention has been made in order to eliminate such inconvenience, and it is possible to improve the production efficiency of the steel strip and to prevent the deterioration of the fuel consumption rate, and the plate temperature of the continuous annealing furnace. The purpose is to provide a control method.

【0007】[0007]

【課題を解決するための手段】かかる目的を達成するた
めに、本発明に係る連続焼鈍炉の板温制御方法は、板
厚、板幅或いは加熱炉の出側での目標板温が異なる鋼帯
を前記加熱炉に連続的に通板して連続焼鈍を行うにあた
って、前記加熱炉の炉温及び前記鋼帯の通板速度を制御
することにより該加熱炉の出側での板温を制御するよう
にした連続焼鈍炉の板温制御方法において、前記通板速
度が減速される場合に、その減速開始時刻及び減速持続
時間を前もって予測し、該減速持続時間が予め定められ
た設定時間より短いときは、前記目標板温を管理範囲上
限値を超えない範囲内で管理目標値より上に設定し、前
記減速持続時間が前記設定時間より長いときは、前記目
標板温を前記管理目標値に設定するようにしたことを特
徴とする。
In order to achieve the above object, a method for controlling a plate temperature of a continuous annealing furnace according to the present invention is a steel plate having different plate thickness, plate width or target plate temperature at the exit side of the heating furnace. When performing continuous annealing by continuously passing the strip through the heating furnace, the strip temperature at the exit side of the heating furnace is controlled by controlling the furnace temperature of the heating furnace and the strip passing speed of the steel strip. In the continuous annealing furnace plate temperature control method, when the stripping speed is decelerated, the deceleration start time and deceleration duration time are predicted in advance, and the deceleration duration time is set from a predetermined set time. When it is short, the target plate temperature is set above the control target value within a range not exceeding the control range upper limit value, and when the deceleration duration is longer than the set time, the target plate temperature is set to the management target value. It is characterized in that it is set to.

【0008】[0008]

【発明の実施の形態】以下、本発明の実施の形態の一例
を図1〜図7を参照して説明する。図1は本発明の実施
の形態の一例である連続焼鈍炉の板温制御方法を実施す
る連続焼鈍設備の一例を示す概略図、図2は定常時にお
けるプロセスコンピュータの作動を説明するためのブロ
ック図、図3は減速開始t分前から減速開始までのプロ
セスコンピュータの作動を説明するためのブロック図、
図4は減速中におけるプロセスコンピュータの作動を説
明するためのブロック図、図5は減速要因解消後におけ
るプロセスコンピュータの作動を説明するためのブロッ
ク図、図6は板温制御を説明するためのフローチャート
図、図7は炉温特性−出側板温特性−通板速度特性の相
関関係を示すグラフ図である。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a schematic diagram showing an example of a continuous annealing facility for carrying out a plate temperature control method for a continuous annealing furnace which is an example of an embodiment of the present invention, and FIG. 2 is a block for explaining the operation of a process computer in a steady state. FIG. 3 is a block diagram for explaining the operation of the process computer from t minutes before deceleration start to deceleration start,
4 is a block diagram for explaining the operation of the process computer during deceleration, FIG. 5 is a block diagram for explaining the operation of the process computer after elimination of the deceleration factor, and FIG. 6 is a flow chart for explaining the plate temperature control. FIG. 7 and FIG. 7 are graphs showing the correlation between the furnace temperature characteristic, the outlet plate temperature characteristic, and the strip speed characteristic.

【0009】まず、図1を参照して連続焼鈍設備の概略
から説明すると、この連続焼鈍設備は、ライン入口に設
置されたペイオフリール1から鋼帯2が連続的に供給さ
れるようになっており、先行の鋼帯2の終端には後行の
鋼帯2の先端が溶接機3によって接続される。また、鋼
帯2はクリーニングセクション4にて洗浄された後、入
側ルーパ装置5によって供給量が調節されたうえで加熱
炉6内に送出される。加熱炉6内で所定の焼鈍サイクル
に従って熱処理された鋼帯2は、出側ルーパ装置7にて
繰出し量が調節されたうえでスキンパスミル8に送り込
まれる。スキンパスミル8にて調質圧延された鋼帯2
は、検査セクション9で不良部分のトリミング処理やカ
ット処理がなされ、その後、テンションリール10に巻
き取られる。加熱炉6内には鋼帯2に適宜な張力を与え
て走行させるためのハースロール11が多数設けられて
いる。尚、加熱炉6は、図示しないラジアントチューブ
による間接加熱方式を採用している。
First, the outline of the continuous annealing equipment will be described with reference to FIG. 1. In this continuous annealing equipment, the steel strip 2 is continuously supplied from the payoff reel 1 installed at the line entrance. The leading end of the trailing steel strip 2 is connected to the end of the leading steel strip 2 by the welding machine 3. Further, the steel strip 2 is washed in the cleaning section 4 and then fed into the heating furnace 6 after the supply amount is adjusted by the entrance looper device 5. The steel strip 2 that has been heat-treated in the heating furnace 6 according to a predetermined annealing cycle is fed to the skin pass mill 8 after the delivery amount is adjusted by the delivery looper device 7. Steel strip 2 temper-rolled by skin pass mill 8
Are subjected to trimming processing and cutting processing of the defective portion in the inspection section 9, and then wound on the tension reel 10. A large number of hearth rolls 11 are provided in the heating furnace 6 for applying an appropriate tension to the steel strip 2 for traveling. The heating furnace 6 employs an indirect heating method using a radiant tube (not shown).

【0010】次に、本発明に係る板温制御システムにつ
いて説明すると、該板温制御システムは、図3に示すよ
うに、製造スケジュールを管理するメインコンピュータ
12と、該メインコンピュータ12からの命令情報(板
厚,目標板温等)に基づいて加熱炉6の操業を制御する
プロセスコンピュータ13とから構成される。プロセス
コンピュータ13は、オペレータが経験等により判断し
ていた通板速度制御の判断基準を所定条件化して記憶し
て、操業状況に応じた加熱炉6の出側での目標板温Ts
n 、目標通板速度Lsn 及び通板速度上限値Ls.maxを
指定するエキスパートシステム14と、エキスパートシ
ステム14から指定された目標通板速度Lsn 及び目標
板温Tsn に応じた目標炉温Tfn を所定のモデル式
(例えばΔTs/ΔX=2・Φcg・σ・(Tf4 −T
4 )/Cp・ρ・D・Ls…以下、モデル式(1)と
いう。ここで、Tsは出側板温(K)、Xは加熱長
(m)、Φcgは総括熱吸収率、σはステファンボルツ
マン定数(J/s・m24 )、Tfは炉温(K)、C
pは比熱(J/kg・K)、ρは比重(kg/m 3 )、
Dは板厚(mm)、Lsは通板速度(m/s)とす
る。)を用いて計算して設定する炉温設定手段15と、
実績炉温Tf及びエキスパートシステム14から指定さ
れた目標板温Tsn に応じた通板速度Lsをエキスパー
トシステム14から指定された通板速度上限値Ls.max
を超えないようにモデル式(1)を用いて計算して設定
する通板速度設定手段16とを備える。
Next, the plate temperature control system according to the present invention will be described.
The plate temperature control system is shown in FIG.
Main computer for managing production schedule
12 and command information from the main computer 12 (board
The operation of the heating furnace 6 is controlled based on the thickness, target plate temperature, etc.)
And the process computer 13. process
The computer 13 is determined by the operator based on experience and the like.
The judgment criteria for strip speed control that was
And the target plate temperature Ts at the exit side of the heating furnace 6 according to the operating condition
n, Target strip speed LsnAnd the strip running speed upper limit value Ls.max
Expert system 14 to specify and expert system
Target strip running speed Ls specified from the stem 14nAnd goals
Plate temperature TsnTarget furnace temperature Tf according tonThe given model formula
(For example, ΔTs / ΔX = 2 · Φcg · σ · (TfFour-T
sFour) / Cp · ρ · D · Ls ...
Say. Where Ts is the outlet plate temperature (K) and X is the heating length.
(M), Φcg is the overall heat absorption rate, σ is Stefan bolts
Mann's constant (J / s ・ mTwoKFour), Tf is furnace temperature (K), C
p is the specific heat (J / kg · K), ρ is the specific gravity (kg / m) Three),
D is plate thickness (mm), Ls is plate passing speed (m / s)
You. ) Is used to calculate and set the furnace temperature setting means 15, and
Actual furnace temperature Tf and specified from expert system 14
Target plate temperature TsnThe passing speed Ls according to
Plate passing speed upper limit value Ls.max specified by the system 14
Calculate and set using model equation (1) so as not to exceed
And a threading speed setting means 16 for performing the threading.

【0011】エキスパートシステム14は、上述した機
能の他、検査セクション9で鋼帯2の不良部分のトリミ
ング処理やカット処理がなされる際に減速される通板速
度の減速開始時刻及び減速持続時間Tを、板厚、板幅或
いは加熱炉6の出側での目標板温Tsn が互いに異なる
鋼帯2毎に前もって予測し、更に、減速持続時間Tが予
め定められた設定時間ΔTより短いときは、炉温設定手
段15に対する目標板温Tsn として管理範囲上限値T
1 を指定し、減速持続時間Tが設定時間ΔTより長い
ときは、炉温設定手段15に対する目標板温Tsn とし
て管理目標値Ts0 を指定する機能を併せ持つ。
In addition to the above-mentioned functions, the expert system 14 has the deceleration start time and deceleration duration T of the strip running speed that is decelerated when the defective portion of the steel strip 2 is trimmed or cut in the inspection section 9. When the deceleration duration T is shorter than a preset set time ΔT, the sheet thickness, the sheet width, or the target sheet temperature Ts n at the exit side of the heating furnace 6 is predicted in advance for each steel strip 2 different from each other. Is the control range upper limit value T as the target plate temperature Ts n for the furnace temperature setting means 15.
When s 1 is designated and the deceleration duration T is longer than the set time ΔT, it also has a function of designating the control target value Ts 0 as the target plate temperature Ts n for the furnace temperature setting means 15.

【0012】次に、かかる板温制御システムの作動を図
2〜図7を参照して説明する。まず、図2、図6及び図
7を参照して、エキスパートシステム14による減速要
因発生中の判断(ステップS1)及び減速要因発生の予
測判断(ステップS2)が共になされない場合には、エ
キスパートシステム14は定常状態と判断し、炉温設定
手段15に対する炉温設定用目標板温Tsn として管理
目標値Ts0 を指定すると共に、目標通板速度Lsn
してLs0 を指定し(ステップS3)、これにより、炉
温設定手段15が目標通板速度Ls0 及び目標板温Ts
0 に応じた目標炉温Tf0 をモデル式(1)を用いて計
算してこれを炉温設定値とする。
Next, the operation of the plate temperature control system will be described with reference to FIGS. First, referring to FIG. 2, FIG. 6 and FIG. 7, when the expert system 14 does not make both the determination that the deceleration factor is occurring (step S1) and the deceleration factor occurrence prediction determination (step S2), the expert system It is determined that 14 is a steady state, and the control target value Ts 0 is specified as the target plate temperature Ts n for setting the furnace temperature for the furnace temperature setting means 15, and Ls 0 is specified as the target strip passing speed Ls n (step S3). As a result, the furnace temperature setting means 15 causes the target strip running speed Ls 0 and the target strip temperature Ts.
The target furnace temperature Tf 0 corresponding to 0 is calculated using the model formula (1), and this is set as the furnace temperature set value.

【0013】同時に、エキスパートシステム14は通板
速度設定手段16に対する通板速度設定用目標板温Ts
n として管理目標値Ts0 を指定すると共に、通板速度
上限値Ls.maxとしてLs0 を指定し(ステップS
3)、これにより、通板速度設定手段16が実績炉温T
f及び目標板温Ts0 に応じた通板速度Ls0 を通板速
度上限値Ls.maxを超えないようにモデル式(1)を用
いて計算してこれを設定通板速度とする。
At the same time, the expert system 14 causes the strip speed setting means 16 to set the strip speed target plate temperature Ts.
The control target value Ts 0 is designated as n , and Ls 0 is designated as the strip running speed upper limit value Ls.max (step S
3), whereby the strip passing speed setting means 16 causes the actual furnace temperature T
The plate passing speed Ls 0 according to f and the target plate temperature Ts 0 is calculated using the model formula (1) so as not to exceed the plate passing speed upper limit value Ls.max, and this is set as the set plate passing speed.

【0014】図3、図6及び図7を参照して、エキスパ
ートシステム14による減速要因発生中の判断(ステッ
プ1)がなされず、t分以内に減速要因が発生するとの
予測判断(ステップ2)がなされた場合には、エキスパ
ートシステム14は炉温設定手段15に対する目標通板
速度Lsn としてLs1 (減速通板速度)を指定(ステ
ップ4)する。
With reference to FIGS. 3, 6 and 7, the expert system 14 does not make a determination (step 1) that a deceleration factor is occurring, and predicts that a deceleration factor will occur within t minutes (step 2). If so, the expert system 14 designates Ls 1 (decelerated running speed) as the target running speed Ls n for the furnace temperature setting means 15 (step 4).

【0015】そして、減速持続時間Tが予め定められた
設定時間ΔTより短いと判断(ステップS6)したとき
は、炉温設定手段15に対する目標板温Tsn として管
理範囲上限値Ts1 を指定(ステップS7)し、これに
より、炉温設定手段15が目標通板速度Ls1 及び目標
板温Ts1 に応じた目標炉温Tf1 をモデル式(1)を
用いて計算してこれを炉温設定値とする。
When it is judged that the deceleration duration time T is shorter than the predetermined set time ΔT (step S6), the control range upper limit value Ts 1 is designated as the target plate temperature Ts n for the furnace temperature setting means 15 ( In step S7), the furnace temperature setting means 15 calculates the target furnace temperature Tf 1 according to the target strip running speed Ls 1 and the target strip temperature Ts 1 by using the model formula (1), and calculates the target furnace temperature Tf 1. Set value.

【0016】一方、減速持続時間Tが予め定められた設
定時間ΔTより長いと判断(ステップS6)したとき
は、炉温設定手段15に対する目標板温Tsn として管
理目標値Ts0 を指定(ステップS8)し、これによ
り、炉温設定手段15が目標通板速度Ls1 及び目標板
温Ts0 に応じた目標炉温Tf0 をモデル式(1)を用
いて計算してこれを炉温設定値とする。
On the other hand, when it is judged that the deceleration duration time T is longer than the predetermined set time ΔT (step S6), the control target value Ts 0 is designated as the target plate temperature Ts n for the furnace temperature setting means 15 (step S6). S8) Then, the furnace temperature setting means 15 calculates the target furnace temperature Tf 0 according to the target strip speed Ls 1 and the target plate temperature Ts 0 using the model formula (1), and sets it. The value.

【0017】同時に、エキスパートシステム14は通板
速度設定手段16に対する通板速度設定用目標板温Ts
n として管理目標値Ts0 を指定すると共に、通板速度
上限値Ls.maxとしてLs0 を指定し(ステップS
4)、これにより、通板速度設定手段16が実績炉温T
f及び目標板温Ts0 に応じた通板速度Lsを通板速度
上限値Ls.maxを超えないようにモデル式(1)を用い
て計算してこれを設定通板速度とし、実績炉温Tfの降
下に従って、通板速度Lsを板温が目標板温に追従する
ように降下させる。
At the same time, the expert system 14 causes the strip speed setting means 16 to set the strip speed target strip temperature Ts.
The control target value Ts 0 is designated as n , and Ls 0 is designated as the strip running speed upper limit value Ls.max (step S
4), whereby the strip passing speed setting means 16 causes the actual furnace temperature T
f and the plate running speed Ls according to the target plate temperature Ts 0 are calculated using the model formula (1) so as not to exceed the plate running speed upper limit Ls.max, and this is set as the set plate running speed, and the actual furnace temperature is set. As the Tf decreases, the strip running speed Ls is reduced so that the strip temperature follows the target strip temperature.

【0018】図4、図6及び図7を参照して、エキスパ
ートシステム14による減速要因発生中の判断(ステッ
プ1)がなされた場合には、エキスパートシステム14
は炉温設定手段15に対する目標通板速度Lsn として
Ls1 を指定(ステップ5)する。 そして、減速持続
時間Tが予め定められた設定時間ΔTより短いと判断
(ステップS6)したときは、炉温設定手段15に対す
る目標板温Tsn として管理範囲上限値Ts1 を指定
(ステップS7)し、これにより、炉温設定手段15が
目標通板速度Ls1 及び目標板温Ts1 に応じた目標炉
温Tf1 をモデル式(1)を用いて計算してこれを炉温
設定値とする。
Referring to FIGS. 4, 6 and 7, when the expert system 14 determines that a deceleration factor is occurring (step 1), the expert system 14
Specifies Ls 1 as the target strip speed Ls n for the furnace temperature setting means 15 (step 5). Then, when it is determined that the deceleration duration time T is shorter than the predetermined set time ΔT (step S6), the control range upper limit value Ts 1 is designated as the target plate temperature Ts n for the furnace temperature setting means 15 (step S7). As a result, the furnace temperature setting means 15 calculates the target furnace temperature Tf 1 according to the target strip running speed Ls 1 and the target plate temperature Ts 1 using the model formula (1) and sets this as the furnace temperature set value. To do.

【0019】一方、エキスパートシステム14が減速持
続時間Tが予め定められた設定時間ΔTより長いと判断
(ステップS6)したときは、炉温設定手段15に対す
る目標板温Tsn として管理目標値Ts0 を指定(ステ
ップS8)し、これにより、炉温設定手段15が目標通
板速度Ls1 及び目標板温Ts0 に応じた目標炉温Tf
0 をモデル式(1)を用いて計算してこれを炉温設定値
とする。
On the other hand, when the expert system 14 determines that the deceleration duration time T is longer than the preset set time ΔT (step S6), the control target value Ts 0 is set as the target plate temperature Ts n for the furnace temperature setting means 15. Is designated (step S8), whereby the furnace temperature setting means 15 sets the target furnace temperature Tf corresponding to the target strip speed Ls 1 and the target strip temperature Ts 0.
0 is calculated using the model formula (1), and this is set as the furnace temperature set value.

【0020】同時に、エキスパートシステム14は通板
速度設定手段16に対する通板速度設定用目標板温Ts
n として管理目標値Ts0 を指定すると共に、通板速度
上限値Ls.maxとしてLs1 を指定し(ステップS
5)、これにより、通板速度設定手段16が実績炉温T
f及び目標板温Ts0 に応じた通板速度Ls1 を通板速
度上限値Ls.maxを超えないようにモデル式(1)を用
いて計算してこれを設定通板速度とする。
At the same time, the expert system 14 causes the strip speed setting means 16 to set the strip speed target plate temperature Ts.
The control target value Ts 0 is designated as n , and Ls 1 is designated as the strip running speed upper limit value Ls.max (step S
5), whereby the strip passing speed setting means 16 causes the actual furnace temperature T
The plate passing speed Ls 1 according to the target plate temperature Ts 0 and f is calculated using the model formula (1) so as not to exceed the plate passing speed upper limit Ls.max, and this is set as the set plate passing speed.

【0021】図5及び図7を参照して、エキスパートシ
ステム14による減速要因解除の判断がなされた場合に
は、エキスパートシステム14は炉温設定手段15に対
する炉温設定用目標板温Tsn として管理目標値Ts0
を指定すると共に、目標通板速度Lsn としてLs0
指定して元の状態に復帰させ、これにより、炉温設定手
段15が目標通板速度Ls0 及び目標板温Ts0 に応じ
た目標炉温Tf0 をモデル式(1)を用いて計算してこ
れを炉温設定値とする。
Referring to FIGS. 5 and 7, when the expert system 14 judges that the deceleration factor is released, the expert system 14 manages the furnace temperature setting means 15 as the target plate temperature Ts n for setting the furnace temperature. Target value Ts 0
Is designated and Ls 0 is designated as the target strip running speed Ls n to restore the original state, whereby the furnace temperature setting means 15 sets the target according to the target strip running speed Ls 0 and the target strip temperature Ts 0. The furnace temperature Tf 0 is calculated using the model formula (1), and this is set as the furnace temperature set value.

【0022】同時に、エキスパートシステム14は通板
速度設定手段16に対する通板速度設定用目標板温Ts
n として管理目標値Ts0 を指定すると共に、通板速度
上限値Ls.maxとしてLs0 を指定して元の状態に復帰
させ、これにより、通板速度設定手段16が実績炉温T
f及び目標板温Ts0 に応じた通板速度Ls0 を通板速
度上限値Ls.maxを超えないようにモデル式(1)を用
いて計算してこれを設定通板速度とする。
At the same time, the expert system 14 causes the strip speed setting means 16 to set the strip speed target plate temperature Ts.
The control target value Ts 0 is designated as n and Ls 0 is designated as the strip running speed upper limit value Ls.max to restore the original state, whereby the strip running speed setting means 16 is set to the actual furnace temperature T.
The plate passing speed Ls 0 according to f and the target plate temperature Ts 0 is calculated using the model formula (1) so as not to exceed the plate passing speed upper limit value Ls.max, and this is set as the set plate passing speed.

【0023】かかる連続焼鈍炉の板温制御方法において
は、減速持続時間Tが予め定められた設定時間ΔTより
短いときは、目標板温Tsn を品質に特に影響を及ぼす
ことがない管理範囲上限値Ts1 に設定して、炉温設定
値Tf1 を従来(Tf0 )より高くしているので、減速
要因解除後の復帰操作時に板温を管理範囲下限値以下に
することなく速やかに上昇させることができ、この結
果、復帰操作時の通板速度の応答性が良くなって鋼帯の
生産効率の向上を図ることができる。
In the plate temperature control method for such a continuous annealing furnace, when the deceleration duration time T is shorter than a predetermined set time ΔT, the target plate temperature Ts n does not particularly affect the quality and the upper limit of the control range. Since the furnace temperature set value Tf 1 is set higher than the conventional value (Tf 0 ) by setting the value Ts 1 , the plate temperature rises quickly without returning to below the lower limit value of the control range at the time of recovery operation after releasing the deceleration factor. As a result, the response of the strip running speed at the time of the returning operation is improved, and the production efficiency of the steel strip can be improved.

【0024】また、目標板温Tsn を管理範囲上限値T
1 に設定して炉温設定値Tf1 を高くする時間が長引
くと燃料原単位の悪化を招くことになるが、減速持続時
間Tが予め定められた設定時間ΔTより長いときは、目
標板温Tsn を管理目標値Ts0 に設定することによ
り、炉温設定値Tf0 を低くするようにしているため、
燃料原単位の悪化を良好に防止することができる。
Further, the target plate temperature Ts n is set to the control range upper limit value T
time is set to s 1 to increase the furnace temperature set value Tf 1 although leads to an prolonged the deterioration of fuel consumption rate, when deceleration duration T is longer than the set time ΔT predetermined, the target plate By setting the temperature Ts n to the control target value Ts 0 , the furnace temperature setting value Tf 0 is lowered,
It is possible to favorably prevent the deterioration of the fuel consumption rate.

【0025】[0025]

【発明の効果】上記の説明から明らかなように、本発明
では、減速持続時間が予め定められた設定時間より短い
ときは、目標板温を品質に特に影響を及ぼすことがない
管理範囲上限値に設定して炉温を従来より高くしている
ので、減速要因解除後の復帰操作時に板温を管理範囲下
限値以下にすることなく速やかに上昇させることがで
き、この結果、復帰操作時の通板速度の応答性が良くな
って鋼帯の生産効率の向上を図ることができる。
As is apparent from the above description, in the present invention, when the deceleration duration time is shorter than the predetermined set time, the target plate temperature does not particularly affect the quality and the control range upper limit value. Since the furnace temperature is set to a higher value than before, the plate temperature can be quickly raised without returning below the lower limit of the control range during the return operation after releasing the deceleration factor. The responsiveness of the strip running speed is improved and the production efficiency of the steel strip can be improved.

【0026】また、目標板温を管理範囲上限値として炉
温を高く時間が長引くと燃料原単位の悪化を招くことに
なるが、減速持続時間が設定時間より長いときは、目標
板温を管理目標値として炉温を低くするようにしている
ため、燃料原単位の悪化を良好に防止することができ
る。
Further, if the target plate temperature is set to the upper limit of the control range and the furnace temperature is set high and the time is prolonged, the fuel consumption rate deteriorates. However, when the deceleration duration is longer than the set time, the target plate temperature is managed. Since the furnace temperature is lowered as the target value, it is possible to favorably prevent the deterioration of the fuel consumption rate.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の実施の形態の一例である連続焼鈍炉の
板温制御方法を実施する連続焼鈍設備の一例を示す概略
図である。
FIG. 1 is a schematic diagram showing an example of continuous annealing equipment for carrying out a plate temperature control method for a continuous annealing furnace which is an example of an embodiment of the present invention.

【図2】定常時におけるプロセスコンピュータの作動を
説明するためのブロック図である。
FIG. 2 is a block diagram for explaining an operation of a process computer in a steady state.

【図3】減速開始t分前から減速開始までのプロセスコ
ンピュータの作動を説明するためのブロック図である。
FIG. 3 is a block diagram for explaining the operation of the process computer from t minutes before the start of deceleration to the start of deceleration.

【図4】減速中におけるプロセスコンピュータの作動を
説明するためのブロック図である。
FIG. 4 is a block diagram for explaining the operation of the process computer during deceleration.

【図5】減速解消後におけるプロセスコンピュータの作
動を説明するためのブロック図である。
FIG. 5 is a block diagram for explaining the operation of the process computer after cancellation of deceleration.

【図6】板温制御を説明するためのフローチャート図で
ある。
FIG. 6 is a flowchart for explaining plate temperature control.

【図7】本発明に係る炉温特性−出側板温特性−通板速
度特性の相関関係を示すグラフ図である。
FIG. 7 is a graph showing a correlation of furnace temperature characteristics-outlet plate temperature characteristics-passing speed characteristics according to the present invention.

【図8】従来の炉温特性−出側板温特性−通板速度特性
の相関関係を示すグラフ図である。
FIG. 8 is a graph showing the correlation between the conventional furnace temperature characteristic-exit side plate temperature characteristic-passing speed characteristic.

【符号の説明】[Explanation of symbols]

2…鋼帯 6…加熱炉 Tsn …目標板温 Tfn …目標炉温 Lsn …目標通板速度 T…減速持続時間 ΔT…設定時間 Ls1 …管理範囲上限値 Ls0 …管理目標値2 ... strip 6 ... furnace Ts n ... target plate temperature Tf n ... target furnace temperature Ls n ... target through plate speed T ... deceleration duration [Delta] T ... set time Ls 1 ... management range upper limit value Ls 0 ... management target value

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 板厚、板幅或いは加熱炉の出側での目標
板温が異なる鋼帯を前記加熱炉に連続的に通板して連続
焼鈍を行うにあたって、前記加熱炉の炉温及び前記鋼帯
の通板速度を制御することにより該加熱炉の出側での板
温を制御するようにした連続焼鈍炉の板温制御方法にお
いて、 前記通板速度が減速される場合に、その減速開始時刻及
び減速持続時間を前もって予測し、該減速持続時間が予
め定められた設定時間より短いときは、前記目標板温を
管理範囲上限値を超えない範囲内で管理目標値より上に
設定し、前記減速持続時間が前記設定時間より長いとき
は、前記目標板温を前記管理目標値に設定するようにし
たことを特徴とする連続焼鈍炉の板温制御方法。
1. When performing continuous annealing by continuously passing steel strips having different sheet thicknesses, sheet widths, or target sheet temperatures at the exit side of the heating furnace to the heating furnace, the furnace temperature of the heating furnace and In the plate temperature control method of the continuous annealing furnace, which is configured to control the plate temperature on the outlet side of the heating furnace by controlling the plate passing speed of the steel strip, when the plate passing speed is reduced, When the deceleration start time and the deceleration duration time are predicted in advance, and when the deceleration duration time is shorter than a preset set time, the target plate temperature is set above the management target value within a range not exceeding the management range upper limit value. Then, when the deceleration duration time is longer than the set time, the target plate temperature is set to the control target value, and the plate temperature control method for a continuous annealing furnace is characterized.
JP33474195A 1995-12-22 1995-12-22 Method for controlling sheet temperature in continuous annealing furnace Pending JPH09176746A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP33474195A JPH09176746A (en) 1995-12-22 1995-12-22 Method for controlling sheet temperature in continuous annealing furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP33474195A JPH09176746A (en) 1995-12-22 1995-12-22 Method for controlling sheet temperature in continuous annealing furnace

Publications (1)

Publication Number Publication Date
JPH09176746A true JPH09176746A (en) 1997-07-08

Family

ID=18280710

Family Applications (1)

Application Number Title Priority Date Filing Date
JP33474195A Pending JPH09176746A (en) 1995-12-22 1995-12-22 Method for controlling sheet temperature in continuous annealing furnace

Country Status (1)

Country Link
JP (1) JPH09176746A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011157590A (en) * 2010-02-01 2011-08-18 Nippon Steel Corp Apparatus and method for controlling sheet temperature in continuous annealing furnace
JP2014173104A (en) * 2013-03-07 2014-09-22 Jfe Steel Corp Plate temperature control method in continuous annealing furnace

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011157590A (en) * 2010-02-01 2011-08-18 Nippon Steel Corp Apparatus and method for controlling sheet temperature in continuous annealing furnace
JP2014173104A (en) * 2013-03-07 2014-09-22 Jfe Steel Corp Plate temperature control method in continuous annealing furnace

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