JPS6070127A - Method for controlling temperature of strip with continuous annealing furnace - Google Patents

Method for controlling temperature of strip with continuous annealing furnace

Info

Publication number
JPS6070127A
JPS6070127A JP17826783A JP17826783A JPS6070127A JP S6070127 A JPS6070127 A JP S6070127A JP 17826783 A JP17826783 A JP 17826783A JP 17826783 A JP17826783 A JP 17826783A JP S6070127 A JPS6070127 A JP S6070127A
Authority
JP
Japan
Prior art keywords
strip
temperature
heating zone
zone
heating
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.)
Granted
Application number
JP17826783A
Other languages
Japanese (ja)
Other versions
JPS634607B2 (en
Inventor
Katsuya Suzuki
勝也 鈴木
Yasuo Ise
伊勢　保夫
Masahiro Shoji
政浩 庄司
Saburo Ito
三郎 伊藤
Akira Yokobari
横張　明
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 Engineering Corp
Original Assignee
NKK Corp
Nippon Kokan Ltd
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 NKK Corp, Nippon Kokan Ltd filed Critical NKK Corp
Priority to JP17826783A priority Critical patent/JPS6070127A/en
Publication of JPS6070127A publication Critical patent/JPS6070127A/en
Publication of JPS634607B2 publication Critical patent/JPS634607B2/ja
Granted legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Control Of Heat Treatment Processes (AREA)

Abstract

PURPOSE:To prevent the temp. deviation of strips with a furnace having direct fire and radiant tube (RT) heating zones by adjusting the RT heating zone with the temp. of the strips in the direct fire heating zone or line speed as a reference. CONSTITUTION:Either of the temp. of strips or line speed in a direct fire heating zone 2 are fixed as a reference in the stage of passing continuously plural kinds of the strips with which heating load is different through a continuous annealing furnace consisting of the zone 2 and an RT heating zone 3. The temp. of the zone 3 is then set and the strips are heated to the target strip temp. The line speed of the strips is adjusted in the case of fixing the strip temp. or the temp. of the strips is adjusted in the case of fixing the line speed in the time until the temp. of the zone 3 is changed to the set temp. The temp. of the strips heated in the zone 3 is controlled to attain the target value by a control device 8.

Description

【発明の詳細な説明】 この発明は、連続焼鈍炉におけるストリップの板温度制
御方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for controlling the temperature of a strip in a continuous annealing furnace.

ストリップを連続焼鈍するに当り、ストリップに、酸化
が生ずることのない光輝焼鈍を施すために、連続焼鈍炉
の加熱帯その他必要な炉帯に還元性のガスを流し、かつ
、その熱源として、ラジアントチューブ又は電気ヒータ
を使用することが知られている。このような連続焼鈍炉
の加熱帯は、ストリップへの熱伝達係数が比較的小さい
（３０〜４−　Ｏｈ　／ｍ２□ｈ℃）ので、生産性を高
めるためには、加熱帯の長さを長くした焼鈍炉を必要と
する。また、加熱帯は、熱容量が太きいために、炉温を
速やかに上昇又は降下させることができず、従って炉温
か設定値になるまでに時間を要する。そのために、現在
処理中のストリップに続いて、ストリップの品種を変更
し、゛寸法が大幅に異なるストリップ又はヒートサイク
ルが大幅に異なるストリップを、連続して処理する際に
、品種変更後のストリップおよび変更前のストリップの
相当量に亘って、加熱帯での板温が適正値から外れた板
温外れが生ずる。When continuously annealing the strip, in order to apply bright annealing to the strip without causing oxidation, a reducing gas is passed through the heating zone of the continuous annealing furnace and other necessary furnace zones, and a radiant gas is used as the heat source. It is known to use tubes or electric heaters. The heating zone of such a continuous annealing furnace has a relatively small heat transfer coefficient to the strip (30~4-Oh/m2□h℃), so in order to increase productivity, the length of the heating zone must be increased. Requires a tempered annealing furnace. Furthermore, since the heating zone has a large heat capacity, it is not possible to quickly raise or lower the furnace temperature, and therefore it takes time for the furnace temperature to reach the set value. To this end, the strip type is changed following the strip currently being processed, and when strips with significantly different dimensions or heat cycles are successively processed, the new strip type and The plate temperature in the heating zone deviates from the appropriate value for a considerable amount of the strip before the change.

従来、板温外れを防止するためには、品種の変更前後の
ストリップの間に、複数コイルからなる接ぎ材を接続し
、接ぎ材が加熱帯を通過する間に、加熱帯の炉温を適正
値に上昇又は降下する方法が採られている。しかしなが
ら、この方法は、接ぎ材が無駄になって不経済である上
、接ぎ材の接続作業を要するという難点がある。そこで
、連続焼鈍炉の加熱帯等の温度又はストリップのライン
速度を適宜変更して、ストリップの板温を制御し、４１
２号および特開昭５２−２９４１０号）が、生産速度を
低下させることなく、且つ、板温外れが生ぜずに制御す
る点において、必ずしも十分とは言えなかった。Conventionally, in order to prevent plate temperature deviation, a joint material made of multiple coils was connected between the strips before and after changing the product type, and while the joint material passed through the heating zone, the furnace temperature of the heating zone was adjusted to the appropriate temperature. A method is adopted in which the value increases or decreases. However, this method has disadvantages in that it is uneconomical because the splicing material is wasted, and it also requires work to connect the splicing material. Therefore, the temperature of the heating zone of the continuous annealing furnace or the line speed of the strip is changed appropriately to control the plate temperature of the strip.
No. 2 and Japanese Unexamined Patent Publication No. 52-29410) were not necessarily sufficient in terms of controlling the production speed without reducing the production speed and without causing the plate temperature to deviate.

この発明は、上述の現状に鑑み、ストリップの品種を変
更するに際して、板温外れを生ずることなく、高効率に
一鈍処理することのできる、連続焼鈍炉におけるス）　
Ｕツゾの板温制御方法を提供するものであって、加熱帯
が、直火加熱帯とラジアントチューブ加熱帯とからなる
連続焼鈍炉において、前記加熱帯での加熱負荷が異なる
複数種類のストリップを連続的に通して連続焼鈍するに
当り、前記直火加熱帯における前記ストリップの板温お
よび前記ストリップのライン速度のいずれか一方を、ぞ
の目標値に固定し、前記ラジアントチューブ加熱帯の炉
温を、前記ストリップが目標板温に加熱される温度に設
定し、そして、前記ラジアントチューブ加熱帯の炉温か
、その設定された温度に変更されるまでの間は、前記直
火加熱帯における前記ストリップの板温を固定した場合
には、前記ストリップのライン速度を、また、前記スト
リップのライン速度を固定した場合には、前記直火加熱
帯における前記ストリップの板温を、それぞれ調整する
ことによって、前記ラジアントチューブ加熱帯において
加熱される前記ストリップの板温を、その目標値となる
ように制御することに特徴を有する。In view of the above-mentioned current situation, the present invention has been devised to provide a continuous annealing furnace that can perform one-step annealing treatment with high efficiency without causing strip temperature deviation when changing the type of strip.
The present invention provides a method for controlling the plate temperature of a U-tube, in which the heating zone is a continuous annealing furnace consisting of a direct flame heating zone and a radiant tube heating zone, and a plurality of types of strips having different heating loads in the heating zone. During continuous annealing, either the plate temperature of the strip in the direct flame heating zone or the line speed of the strip is fixed at the respective target value, and the temperature of the strip in the radiant tube heating zone is The temperature is set to a temperature at which the strip is heated to the target plate temperature, and the temperature in the direct flame heating zone is set until the furnace temperature of the radiant tube heating zone is changed to the set temperature. When the temperature of the strip is fixed, the line speed of the strip is fixed, and when the line speed of the strip is fixed, the temperature of the strip in the direct heating zone is adjusted. The present invention is characterized in that the plate temperature of the strip heated in the radiant tube heating zone is controlled to a target value.

第１図は、この発明の板温制御方法に用いられる連続焼
鈍炉の構成例を示しｋものである。第１図において、１
は予熱帯、２は直火加熱帯、３はＲＴ加熱帯（ラジアン
トチューブ加熱帯）、４はＲ’１４１熱帯（ラジアント
チューブ均熱帯）、５は冷却帯、６はシェルフ帯、７は
調整冷却帯であり、ラジアントチューブ帯をＲＴ加熱帯
３とＲＴ均熱帯４とに分け、このＲＴ加熱帯３と直火加
熱帯２とで焼鈍炉の加熱帯を構成している。直火加熱帯
２での加熱法としては、無酸化炉方式、輝炎輻射管方式
等がある。なお、第１図は縦型焼鈍炉の構成例を示した
が、横型の焼鈍炉においても、同様な加熱帯構成とする
。FIG. 1 shows an example of the configuration of a continuous annealing furnace used in the plate temperature control method of the present invention. In Figure 1, 1
is the preheating zone, 2 is the direct heating zone, 3 is the RT heating zone (radiant tube heating zone), 4 is the R'141 tropical zone (radiant tube soaking zone), 5 is the cooling zone, 6 is the shelf zone, and 7 is the adjusted cooling zone. The radiant tube zone is divided into an RT heating zone 3 and an RT soaking zone 4, and the RT heating zone 3 and the direct flame heating zone 2 constitute the heating zone of the annealing furnace. Heating methods in the direct flame heating zone 2 include a non-oxidizing furnace method, a bright flame radiation tube method, and the like. Although FIG. 1 shows an example of the configuration of a vertical annealing furnace, a horizontal annealing furnace also has a similar heating zone configuration.

第１図および第２図に示すように、連続焼鈍炉に導かれ
たストリップＬば、予熱帯１でＳＴｏの温度に予熱され
たのち、直火加熱帯でＳＴ、に、そして、ＲＴＴ熱帯３
でＳＴ、の温度に加熱される。次いでストリップＬは、
ＲＴＴ熱帯４でＳＴ３の温度に均熱され、冷却帯５でＳ
Ｔ４の温度まで冷却されたのチ、シェルフ帯６でＳＴ、
の温度でシェルフ処理が施され、調整冷却帯７でＳ　Ｔ
ａの温度まで調整冷却される。As shown in FIGS. 1 and 2, the strip L introduced into the continuous annealing furnace is preheated to a temperature of STo in a preheating zone 1, then to ST in a direct heating zone, and then to an RTT zone of 3.
is heated to a temperature of ST. Then the strip L is
It is soaked to a temperature of ST3 in RTT tropic 4, and S in cooling zone 5.
After cooling to the temperature of T4, ST at shelf zone 6,
Shelving treatment is performed at a temperature of S T
It is adjusted and cooled to the temperature of a.

上述した連続焼鈍炉において、加熱帯での加熱負荷の異
なるストリップ、すなわち、寸法又はヒートサイクルの
異なるストリップを、連続的に通して焼鈍する際におけ
るストリップの板温制御は、次のようにして行なわれる
。すなわち、加熱帯は、炉温の止弁性および降下性（以
下応答性と称す）に優れた直火加熱帯２と、炉温の応答
性に劣るＲＴＴ熱帯３とから構成されているが、加熱負
荷の増加を必要とする場合は、ストリップに酸化が生ず
る点から、直火加熱帯での板温上昇には限界があり、応
答性の劣るＲＴＴ熱帯で、板温を高くするり要がある。In the above-mentioned continuous annealing furnace, strip plate temperature control when continuously annealing strips with different heating loads in the heating zone, that is, strips with different dimensions or heat cycles, is performed as follows. It will be done. That is, the heating zone is composed of a direct-fired heating zone 2 which has excellent shutoff and lowering characteristics (hereinafter referred to as responsiveness) of the furnace temperature, and an RTT tropical zone 3 which has poor furnace temperature responsiveness. If it is necessary to increase the heating load, there is a limit to the increase in plate temperature in the open heating zone due to the occurrence of oxidation in the strip, and it is necessary to increase the plate temperature in the RTT tropics where response is poor. be.

そこで、この発明では、品種の異なるストリップに変更
するに際し、変更後のストリップが、加熱帯での加熱負
荷を増加し、減少し又は増減する必要がないかに応じ、
Ｒ，Ｔ加熱帯で、板温の増加を必要とするか、板温の減
少を必要とするか、または、板温をほぼ変える必要がな
いかで区分し、次のようにして、変更後のストリップの
板温制御を行なう。Therefore, in this invention, when changing to a different type of strip, depending on whether the changed strip requires increasing, decreasing, or increasing/decreasing the heating load in the heating zone,
In the R and T heating zones, classify whether an increase in plate temperature is required, a decrease in plate temperature, or almost no change in plate temperature is required, and after the change, do the following: The temperature of the strip is controlled.

（］）ＲＴ加熱帯に更に熱を供給し、ＲＴＴ熱帯での板
温をＳＴ、からＳＴ２に増加させる、加熱負荷の増加を
行なうとき： （ａ）　まず、第３図（ａ）に示すように、ストリップ
（品種変更後のス）　ＩＪツブ、以下同じ）の直火加熱
帯での板温を、その目標板温ＳＴ、＊に固定する。(]) When increasing the heating load by supplying more heat to the RT heating zone and increasing the plate temperature in the RTT tropics from ST to ST2: (a) First, as shown in Figure 3 (a) Next, the plate temperature of the strip (after changing the product type) IJ tube (hereinafter the same) in the open heating zone is fixed at its target plate temperature ST, *.

（ｂ）ＲＴＴ熱帯を構成する各加熱ゾーンの炉温を、ス
トリップの目標ライン速度ＶおよびＲＴＴ熱帯での目標
板温ＳＴ−が確保されるのに必要な、目標炉温ＦＴ、　
、　ＦＴ２−　ＦＴｎ　（ＦＴｌ）に設定する。(b) The furnace temperature of each heating zone constituting the RTT tropic is set to the target furnace temperature FT necessary to ensure the target line speed V of the strip and the target plate temperature ST- in the RTT tropic.
, FT2-FTn (FTl).

（ｃ）　次に、ＲＴＴ熱帯の炉帯熱容量のために上記目
標炉温ＦＴ１　（ｉ＝１〜ｎ）へと徐々に昇温する、Ｒ
Ｔ加加熱帯別加熱ゾーン温度ＦＴ、　、　ＦＴ２・・・
、ＦＴｎ（ＦＴｉ）を逐次測定し、その実測値ＦＴ１（
ｉ＋＝１〜ｎ）からＲＴＴ熱帯での目標板温ＳＴ２が確
保テキる、ストリップのライン速度ｙを算出して、スト
リップのライン速度を、算出されたライン速度Ｖに設定
する。ライン速度がｙに設定されたストリップは、減速
し、直火加熱帯およびＲＴＴ熱帯での加熱時間が長くな
る。(c) Next, R
Heating zone temperature by T heating zone FT, , FT2...
, FTn (FTi) are sequentially measured, and the actual measured value FT1 (
i+=1 to n), the line speed y of the strip that ensures the target plate temperature ST2 in the RTT tropics is calculated, and the line speed of the strip is set to the calculated line speed V. Strips with line speed set to y will slow down and have longer heating times in the open fire heating zone and RTT tropics.

（ｄ）　上記（Ｃ）のＲＴ加加熱帯別加熱ゾーン温度Ｆ
Ｔｉ（ｉ＝１〜ｎ）の測定、ライン速度Ｖの算出および
ライン速度の設定を、設定ライン速度が目標ライン速度
Ｖ＊に達するまで繰返す。設定ライン速度は徐々に大き
くなり、目標ライン速度Ｖ＊に達する。(d) Heating zone temperature F for each RT heating zone in (C) above
The measurement of Ti (i=1 to n), the calculation of the line speed V, and the setting of the line speed are repeated until the set line speed reaches the target line speed V*. The set line speed gradually increases and reaches the target line speed V*.

（ｅ）　設定ライン速度が目標ライン速度ｖ＊ＶｔＣ達
した時点より定常状態になり、ストリップは、目標ライ
ン速度ｆて流れ、直火加熱帯での板温がＳＴ、＊に、　
ＲＴＴ熱帯での板温がＳＴ２にそｔぞれ制御される。(e) When the set line speed reaches the target line speed v*VtC, a steady state is reached, the strip flows at the target line speed f, and the plate temperature in the open heating zone becomes ST, *.
The plate temperature in the RTT tropics is controlled by ST2.

（２）ＲＴＴ熱帯よｐ熱を取り去り、ＲＴＴ熱帯での板
温をＳＴ２からＳＴ２＊＊へ減少する、加熱負荷の減少
のとき： （ａ）　第３図（ｂ）に示すように、ストリップのライ
ン速度を、その目標ライン速度ｖ＊＊に固定する。(2) When the heating load is reduced to remove p heat from the RTT tropics and reduce the plate temperature in the RTT tropics from ST2 to ST2**: (a) As shown in Figure 3(b), Fix the line speed to its target line speed v**.

（ｂ）ＲＴＴ熱帯を構成する各加熱ゾーンの炉温を、ス
トリップの目標ライン速度ψ＊およびＲＴＴ熱帯での目
標板温ＳＴ２＊＊が確保できる、目標炉温Ｆ　Ｔ１＋　
Ｆ　Ｔ２　＊＊、　＋＋　Ｆ　Ｔ　ｎ＊＊（Ｆ　Ｔ　ｉ
＊＊）に設定する。(b) Target furnace temperature F T1+ that can ensure the target line speed ψ* of the strip and the target plate temperature ST2** in the RTT tropic for the furnace temperature of each heating zone that makes up the RTT tropic.
F T2 **, ++ F T n** (F T i
**).

＊＊ （ｃ）次に、炉帯熱容量のために上記目標炉温胃−（ｉ
＝１〜ｎ）へと徐々に降温する、ＲＴＴ熱帯の各加熱ゾ
ーンの温度ＦＴＩ、ＦＴ２・・・ＦＴｎ（ＦＴｉ）を逐
次測定し、その実測値ＦＴｉ（ｆ＝１〜ｎ）からＲＴＴ
熱帯での目標板温ＳＴ２　が確保できる、直火加熱帯で
の板温Ｓ　Ｔ、’を算出して、直火加熱帯でのストリッ
プの板温を、その算出された板温Ｓ　Ｔ＋　’に設定す
る。** (c) Next, for the furnace zone heat capacity, the above target furnace temperature stomach - (i
Temperatures FTI, FT2...FTn (FTi) of each heating zone in the RTT tropics are sequentially measured, and the temperature gradually decreases from the actual value FTi (f = 1 to n) to RTT.
Calculate the strip temperature ST,' in the open-fire heating zone that can ensure the target strip temperature ST2 in the tropics, and change the strip temperature in the open-fire heating zone to the calculated strip temperature ST+'. Set.

（ｄ）　上記（Ｃ）のＲＴ加加熱帯別加熱ゾーン温度Ｆ
Ｔｉ（ｉ＝１〜ｎ）の測定、直火加熱帯での板温ＳＴ、
’の算出および直火加熱帯でのストリップの板温の設定
を、設定直火加熱帯板温が目標板温ＳＴ、に達するまで
繰返す。設定直火加熱帯板温は徐々に上昇し、目標板温
ＳＴ、＊＊に達する。(d) Heating zone temperature F for each RT heating zone in (C) above
Measurement of Ti (i = 1 to n), plate temperature ST in the open heating zone,
The calculation of ' and the setting of the strip temperature in the open heating zone are repeated until the set open heating strip temperature reaches the target strip temperature ST. The set direct flame heating strip temperature gradually rises and reaches the target strip temperature ST,**.

（ｅ）　設定直火加熱帯板温が目標板温Ｓ　ＴＨ”に達
した時点より定常状態となり、ストリップは、ライン速
度ｖ＊＊で流れ、直火加熱帯での板温がＳＴ、＊＊に、
ＲＴＴ熱帯での板温がＳＴ２＊＊に、それぞれ制御をさ
れる。(e) When the set plate temperature of the direct flame heating band reaches the target plate temperature S TH, the steady state is reached, the strip flows at the line speed v**, and the plate temperature in the direct flame heating band is ST, ** To,
The plate temperature in the RTT tropics is controlled by ST2**.

（３）ＲＴＴ熱帯での板温をほぼ変えることのない、加
熱負荷の増減を伴なわないとき：このときには、ストリ
ップに応じて定まる、ライン速度Ｖ＊０、直火加熱帯で
の板温ＳＴ、＊＊＊、ＲＴＴ熱帯での板温ＳＴ２＊林の
定常状態を維持できるように、ＲＴＴ熱帯炉温を微調整
するだけでよく、ストリップの板温制御をするのに特別
な措置をする必要がない。(3) When the plate temperature in the RTT tropics is almost unchanged and there is no increase or decrease in the heating load: In this case, the line speed V*0 is determined according to the strip, and the plate temperature ST in the open heating zone , ***, In order to maintain the steady state of RTT tropical strip temperature ST2*rin, it is only necessary to make minor adjustments to the RTT tropical furnace temperature, and no special measures are required to control the strip temperature. There is no.

上記（１）（ａ）〜（ｅ）のような、ストリップの板温
制御によれば、ＲＴＴ熱帯の炉温か上昇してその設定さ
れた温度に変更されるまでの間、ライン速度を調整して
、ＲＴＴ熱帯でのストリップの板温を、目標板温にして
いるので、加熱負荷の増加を必要とするストリップに品
種変更するに際し、変更後のストリップに、適切な板温
制御を行なうこと力２できる。また、上記（２）　（ａ
）〜（ｅ）のような、ストリップの板温制御によれば、
ＲＴＴ熱帯の炉温か降下してその設定された温度に変更
されるまでの間、直火加熱帯での板温を調整して、ＲＴ
Ｔ熱帯でのストリップの板温を、目標板温にしているの
で、加熱負荷の減少を必要とするストリップに品種変更
するに際し、変更後のストリップに、適切な板温制御を
行なうことができる。According to strip temperature control as described in (1) (a) to (e) above, the line speed is adjusted until the RTT tropical furnace temperature rises and changes to the set temperature. Therefore, when changing the type of strip to a strip that requires an increase in heating load, the temperature of the strip in the RTT tropical zone is set to the target temperature. 2 I can do it. In addition, above (2) (a
) to (e), according to strip temperature control,
Until the furnace temperature of the RTT tropics drops and is changed to the set temperature, the plate temperature in the direct fire heating zone is adjusted and the RT
Since the strip temperature in the T tropics is set to the target strip temperature, when changing the type of strip to one that requires a reduction in heating load, appropriate strip temperature control can be performed on the changed strip.

第４図は、この発明を実施するための、焼鈍炉の直火加
熱帯およびＲＴＴ熱帯に設けられた、制御システムの構
成例である。第４図において、８は制御装置で、制御装
置８には、直火加熱帯２の出口に設けられた直火加熱帯
出口板温度計９、ＲＴＴ熱帯３の各加熱ゾーンに設けら
れた炉温測定熱電対１０．　、１０□−・・、１０ｎ、
ＲＴＴ熱帯３の出口に設けられたＲＴＴ熱帯出口板温度
計１１およびライン速度測定器１２の信号が入力され、
一方、制御装置８からは、直火加熱帯板温調節計１３′
を介して直火加熱帯燃焼装置１３へ、ＲＴ加加熱帯別加
熱ゾーン炉温調節計１４．’　、　１．４□′・・・、
１４ｎ′を介してＲＴ加加熱帯別加熱ゾーン燃焼装置１
４１．１４２、・・・、１４ｎへ、さらにライン速度駆
動回路１５へ、必要な信号を出力する。制御装置８は、
連続して通板されるストリップの寸法、ヒートサイクル
、材質およびライン速度を常時管理し、上述した板温制
御をする。FIG. 4 is a configuration example of a control system installed in the direct-fired heating zone of the annealing furnace and in the RTT zone for carrying out the present invention. In FIG. 4, 8 is a control device, and the control device 8 includes a direct-fired heating zone outlet plate thermometer 9 provided at the outlet of the direct-fired heating zone 2, and a furnace provided in each heating zone of the RTT tropical zone 3. Temperature measurement thermocouple 10. , 10□-..., 10n,
Signals from the RTT tropical exit plate thermometer 11 and line speed measuring device 12 provided at the exit of the RTT tropical 3 are input,
On the other hand, from the control device 8, a direct flame heating strip temperature controller 13'
to the direct-fired heating zone combustion device 13 via the RT heating zone-specific heating zone furnace temperature controller 14. ', 1.4□'...,
RT heating zone separate heating zone combustion device 1 via 14n'
41, 142, . . . , 14n, and further to the line speed drive circuit 15, necessary signals are output. The control device 8 is
The dimensions, heat cycle, material, and line speed of the strip that is continuously threaded are constantly managed, and the above-mentioned strip temperature is controlled.

この発明は以上のように構成されるので、加熱帯での加
熱負荷が異なるストリップに品種変更するに際し、変更
後のストリップに板温外れが生ずることなく、効率良く
焼鈍処理することができる。Since the present invention is configured as described above, when changing the type of strip to a strip that requires a different heating load in the heating zone, the changed strip can be efficiently annealed without causing deviation in plate temperature.

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

第１図は、この発明の板温制御方法に用いられる連続焼
鈍炉の構成図、第２図は、第１図の焼鈍炉におけるスト
リップ板温の一例を示すヒートサイクル図、第３図（ａ
）　、　（ｂ）は、この発明の板温制御方法を示す説明
図、第４図は、この発明の方法を実施するための制御シ
ステムのブロック図でアル。 図面において、 ２・・・直火加熱帯、３・・・ＲＴＴ熱帯、４・・・Ｒ
ＴＴ熱帯。 出願人　日本鋼管株式会社 代理人　潮　谷　奈津夫（他２名） 年１図 ３　４ 第２図 第４３図 （ａ）FIG. 1 is a block diagram of a continuous annealing furnace used in the sheet temperature control method of the present invention, FIG. 2 is a heat cycle diagram showing an example of the strip plate temperature in the annealing furnace of FIG. 1, and FIG.
), (b) is an explanatory diagram showing the plate temperature control method of the present invention, and FIG. 4 is a block diagram of a control system for implementing the method of the present invention. In the drawings, 2...Direct fire heating zone, 3...RTT tropical, 4...R
TT Tropical. Applicant Nippon Kokan Co., Ltd. Agent Natsuo Shioya (and 2 others) Year 1 Figure 3 4 Figure 2 Figure 43 (a)

Claims (3)

【特許請求の範囲】[Claims] （１）加熱帯が、直火加熱帯とラジアントチューブ加熱
帯とからなる連続焼鈍炉において、前記加熱帯での加熱
負荷が異なる複数種類のス）　ＩＪッゾを連続的に通し
て連続焼鈍するに当り、前記直火加熱帯における前記ス
トリップの板温および前記ストリップのライン速度のい
ずれか一方を、その目標値に固定し、前記ラジアントチ
ューブ加熱帯の炉温を、前記ストリップが目標板温に加
熱される温度に設定し、そして、前記ラジアントチュー
ブ加熱帯の炉温か、その設定された温度に変更されるま
での間は、前記直火加熱帯における前記ストリップの板
温を固定した場合には、　１− 前記ストリップのライン速度を、また、前記ストリップ
のライン速度を固定した場合には、前記直火加熱帯にお
ける前記ストリップの板温を、それぞれ調整することに
よって、前記ラジアントチューブ加熱帯において加熱さ
れる前記ストリップの板温を、その目標値となるように
制御することを特徴とする連続焼鈍炉におけるストリッ
プの板温制御方法。(1) In a continuous annealing furnace in which the heating zone consists of a direct flame heating zone and a radiant tube heating zone, continuous annealing is performed by continuously passing through multiple types of IJs with different heating loads in the heating zone. At this time, one of the plate temperature of the strip and the line speed of the strip in the direct flame heating zone is fixed at their target values, and the furnace temperature of the radiant tube heating zone is adjusted so that the strip reaches the target plate temperature. When the plate temperature of the strip in the direct fire heating zone is fixed until the furnace temperature of the radiant tube heating zone is changed to the set temperature, , 1- heating in the radiant tube heating zone by adjusting the line speed of the strip, or, if the line speed of the strip is fixed, the plate temperature of the strip in the direct fire heating zone; A method for controlling the temperature of a strip in a continuous annealing furnace, characterized in that the temperature of the strip is controlled to a target value. （２）　前記加熱帯での加熱負荷が異なるストリップが
、前記加熱負荷の増加を必要とする場合は、前記直火加
熱帯における前記ストリップの板温をその目標値に固定
し、そして、前記ラジアントチューブ加熱帯の炉温か、
その設定された温度に変更されるまでの間は、前記スト
リップのライン速度を調整することを特徴とする特許請
求の範囲第（１）項に記載の連続焼鈍炉におけるストリ
ップの板温制御方法。(2) If a strip with a different heating load in the heating zone requires an increase in the heating load, the plate temperature of the strip in the open heating zone is fixed at its target value, and the radiant Furnace temperature of tube heating zone,
The method for controlling the temperature of a strip in a continuous annealing furnace according to claim 1, wherein the line speed of the strip is adjusted until the temperature is changed to the set temperature. （３）前記加熱帯での加熱負荷が異なるストリップが、
前記加熱負荷の減少を必要とする場合は、前記ストリッ
プのライン速度をその目標値に固定し、そして、前記ラ
ジアントチューブ加熱帯の炉温か、その設定された温度
に変更されるまでの間は、前記直火加熱帯における前記
ストリップの板温を調整することを特徴とする特許請求
の範囲第（１）項に記載の連続焼鈍炉におけるストリッ
プの板温制御方法。(3) Strips with different heating loads in the heating zone,
If a reduction in the heating load is required, the line speed of the strip is fixed at its target value until the furnace temperature of the radiant tube heating zone is changed to its set temperature. The method for controlling the temperature of a strip in a continuous annealing furnace according to claim 1, wherein the temperature of the strip in the direct-fired heating zone is adjusted.
JP17826783A 1983-09-28 1983-09-28 Method for controlling temperature of strip with continuous annealing furnace Granted JPS6070127A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17826783A JPS6070127A (en) 1983-09-28 1983-09-28 Method for controlling temperature of strip with continuous annealing furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17826783A JPS6070127A (en) 1983-09-28 1983-09-28 Method for controlling temperature of strip with continuous annealing furnace

Publications (2)

Publication Number Publication Date
JPS6070127A true JPS6070127A (en) 1985-04-20
JPS634607B2 JPS634607B2 (en) 1988-01-29

Family

ID=16045492

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17826783A Granted JPS6070127A (en) 1983-09-28 1983-09-28 Method for controlling temperature of strip with continuous annealing furnace

Country Status (1)

Country Link
JP (1) JPS6070127A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002349009A (en) * 2001-05-28 2002-12-04 Ryoka E-Tec Kk Panel for wall surface
KR20180020264A (en) * 2015-06-24 2018-02-27 노벨리스 인크. Fast response heaters and associated control systems used in combination with metal treatment furnaces

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01121306U (en) * 1988-02-10 1989-08-17

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002349009A (en) * 2001-05-28 2002-12-04 Ryoka E-Tec Kk Panel for wall surface
KR20180020264A (en) * 2015-06-24 2018-02-27 노벨리스 인크. Fast response heaters and associated control systems used in combination with metal treatment furnaces
JP2018524467A (en) * 2015-06-24 2018-08-30 ノベリス・インコーポレイテッドＮｏｖｅｌｉｓ Ｉｎｃ． Fast reaction, heaters and related control systems used in combination with metal processing furnaces
JP2019189945A (en) * 2015-06-24 2019-10-31 ノベリス・インコーポレイテッドＮｏｖｅｌｉｓ Ｉｎｃ． Fast response heater and associated control system used in combination with metal treatment furnace
US10648738B2 (en) 2015-06-24 2020-05-12 Novelis Inc. Fast response heaters and associated control systems used in combination with metal treatment furnaces
US11268765B2 (en) 2015-06-24 2022-03-08 Novelis Inc. Fast response heaters and associated control systems used in combination with metal treatment furnaces

Also Published As

Publication number Publication date
JPS634607B2 (en) 1988-01-29

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