JPH04221027A - Method for controlling induction heater - Google Patents
Method for controlling induction heaterInfo
- Publication number
- JPH04221027A JPH04221027A JP2404555A JP40455590A JPH04221027A JP H04221027 A JPH04221027 A JP H04221027A JP 2404555 A JP2404555 A JP 2404555A JP 40455590 A JP40455590 A JP 40455590A JP H04221027 A JPH04221027 A JP H04221027A
- Authority
- JP
- Japan
- Prior art keywords
- strip
- heating device
- temperature
- induction heating
- target 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.)
- Granted
Links
- 230000006698 induction Effects 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims description 34
- 238000010438 heat treatment Methods 0.000 claims abstract description 99
- 238000004364 calculation method Methods 0.000 description 20
- 238000012545 processing Methods 0.000 description 11
- 239000000463 material Substances 0.000 description 6
- 238000000137 annealing Methods 0.000 description 3
- 238000005094 computer simulation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 238000009529 body temperature measurement Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 101000582320 Homo sapiens Neurogenic differentiation factor 6 Proteins 0.000 description 1
- 102100030589 Neurogenic differentiation factor 6 Human genes 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- General Induction Heating (AREA)
- Control Of Heat Treatment Processes (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、被加熱材を搬送しなが
ら加熱する誘導加熱装置の制御方法に関するものである
。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of controlling an induction heating apparatus that heats a material to be heated while conveying it.
【０００２】0002
【従来の技術】一般に、搬送される物体を誘導加熱装置
にて加熱を行う場合の必要電力Ｐ（ｋＷ）は、数式１に
て求められる。2. Description of the Related Art Generally, the required power P (kW) when an object to be transported is heated by an induction heating device is determined by Equation 1.
【０００３】0003
【数１】[Math 1]
【０００４】一方、誘導加熱装置を被加熱材が通過する
過程では、コイル中で加熱最中での熱放散やコイル間の
空走部通過時に於ける熱放散等の熱損失（温度降下）分
が発生する。特に、薄板（ストリップ）を移送しながら
加熱する場合には、ストリップがばたつきやすいこと、
また加熱効率をあげるためにはストリップとコイルとの
間の距離をできるだけ小さくする方が有利であることか
ら、その間隔は５０〜１００ｍｍ程度しかないことによ
り、ストリップとコイルあるいはコイルを保護する耐火
物とが接触しやすく、これを防ぐためにサポートロール
をコイル間に設置しなければならない。よって、そのた
めのコイル間空走部が２〜３ｍ必要であり、そこでの熱
損失分が無視できず制御誤差の大きな原因となる。又、
既存の設備を改造して誘導加熱装置を設置する場合など
には既設物との干渉によりやむなく空走部が生じて同様
な問題が発生してしまうことがある。ここで、図１にレ
イアウトを示す誘導加熱装置を例にして、その制御誤差
を計算機シュミレーションにより試算してみる。表１が
その誘導加熱装置の諸元である。On the other hand, during the process in which the material to be heated passes through the induction heating device, heat loss (temperature drop) occurs due to heat dissipation during heating in the coil and heat dissipation when passing through the free running section between the coils. occurs. In particular, when heating a thin plate (strip) while transferring it, the strip tends to flap.
In addition, in order to increase heating efficiency, it is advantageous to minimize the distance between the strip and the coil, so the distance between the strip and the coil is only about 50 to 100 mm. To prevent this, support rolls must be installed between the coils. Therefore, a distance of 2 to 3 m is required for the free running section between the coils, and the heat loss there cannot be ignored and becomes a major cause of control errors. or,
When installing an induction heating device by modifying existing equipment, interference with the existing equipment may unavoidably result in empty running sections, causing similar problems. Here, using the induction heating apparatus whose layout is shown in FIG. 1 as an example, the control error will be calculated by computer simulation. Table 1 shows the specifications of the induction heating device.
【０００５】[0005]
【表１】[Table 1]
【０００６】本例の誘導加熱装置は竪型連続焼鈍炉の１
パスに定格出力１０００ｋＷの誘導加熱装置（コイル）
を３基タンデム状に配置しており、ストリップの通板方
向の上流側から順番にＮｏ．１誘導加熱装置３３、Ｎｏ
．２誘導加熱装置３４、Ｎｏ．３誘導加熱装置３５と称
している。また、Ｎｏ．１誘導加熱コイル３３ＣとＮｏ
．２誘導加熱コイル３４Ｃとの間に前述したストリップ
サポートロール３６が設置されており、その区間が空走
部となっている。（第１空走部）さらに、最終段のＮｏ
．３誘導加熱コイル３５Ｃから温度管理用の誘導加熱装
置出口板温計３８までの間も空走部となっている。（第
２空走部）また、３７は誘導加熱装置入口の板温を測定
する誘導加熱装置入口板温計である。表２は計算機シュ
ミレーションに使用した各条件値である。The induction heating device of this example is one of the vertical continuous annealing furnaces.
Induction heating device (coil) with a rated output of 1000kW on the path
Three units are arranged in tandem, and the No. 1 induction heating device 33, No.
．． 2 induction heating device 34, No. 3 induction heating device 35. Also, No. 1 induction heating coil 33C and No.
．． The above-mentioned strip support roll 36 is installed between the two induction heating coils 34C, and that section is a free running section. (1st empty running section) Furthermore, the No.
．． There is also an idle running section between the three induction heating coils 35C and the induction heating device outlet plate thermometer 38 for temperature control. (Second idle running section) Further, 37 is an induction heating device inlet plate thermometer for measuring the plate temperature at the induction heating device inlet. Table 2 shows each condition value used in the computer simulation.
【０００７】[0007]
【表２】[Table 2]
【０００８】計算機シュミレーションは、入側板温計か
ら出側板温計までのスパン（２３ｍ）を１ｍ間隔で区切
り、入側板温計直下の板温を基準として、上流側より下
流側へ向かって、各区間での誘導加熱による温度上昇分
と熱放散による温度降下分を加えたもの（通電していな
いコイルを通過する場合や空走部を通過する場合は温度
降下分のみ）を出側板温計直下位置まで積算する熱収支
モデル式により収束計算を行って、加熱目標温度あるい
は目標昇温量を達成するときのコイルの設定電力値を求
める方法にて行った。また、各コイルへの電力設定配分
は各誘導加熱装置の最大投入電力に対して均等負荷率と
なるような配分とした。その試算結果を表３に示す。[0008] In the computer simulation, the span (23 m) from the inlet plate thermometer to the outlet plate thermometer is divided into 1 m intervals, and each temperature is measured from the upstream side to the downstream side, with the plate temperature directly below the inlet plate thermometer as the reference. The sum of the temperature rise due to induction heating and the temperature drop due to heat dissipation in the section (when passing through a coil that is not energized or passing through an idle running section, only the temperature drop) is measured directly below the outlet plate thermometer. A convergence calculation was performed using a heat balance model equation that integrates up to the position, and the set power value of the coil when achieving the heating target temperature or the target temperature increase amount was determined. In addition, the power setting distribution to each coil was made such that the load ratio was equal to the maximum input power of each induction heating device. The trial calculation results are shown in Table 3.
【０００９】[0009]
【表３】[Table 3]
【００１０】例えば、炉速が１００ｍｐｍ でストリッ
プの温度を３００℃から１００℃昇温させる場合には、
熱損失分を考慮すれば３基合計で１２６６（ｋＷ）を必
要とする。一方、数式１の一般式にて求めた必要電力Ｐ
Ｇ （ｋＷ）は、下記の数式２に示すように、For example, when increasing the temperature of the strip from 300°C to 100°C at a furnace speed of 100mpm,
Taking heat loss into consideration, a total of 1266 (kW) is required for the three units. On the other hand, the required power P calculated using the general formula of Equation 1
G (kW) is as shown in formula 2 below,
【００１１】[0011]
【数２】[Math 2]
【００１２】であり、３０３（ｋＷ）分の誤差があるこ
とが判る。そしてこの３０３（ｋＷ）分に相当する温度
誤差は約２４℃にもなる。よって、誘導加熱装置でスト
リップの温度を制御する場合には、これらの熱損失分を
見込んだ電力値を誘導加熱装置に設定しなければ、その
分が誤差となり制御精度が確保できない。It can be seen that there is an error of 303 (kW). The temperature error corresponding to this 303 (kW) is about 24°C. Therefore, when controlling the temperature of the strip with an induction heating device, unless the induction heating device is set to a power value that takes into account these heat losses, the amount will result in an error and control accuracy cannot be ensured.
【００１３】一方、特開昭５１−８７８３６、特開昭５
２−６２１１０、特開昭５２−１２２９４１、特開昭５
２−１２２９４２、特開昭５７−３７６７９、特開昭５
９−５９８２４号公報などの公知の誘導加熱装置の制御
方法では、制御誤差を誘導加熱装置出口に設置する板温
計により検出して、誘導加熱装置への電力設定値を修正
するいわゆるフィードバック制御により、熱損失分に起
因するもの以外の諸条件の変化に起因するものも含めて
、制御誤差を抑制する方式を採っている。On the other hand, JP-A-51-87836, JP-A-5
2-62110, JP-A-52-122941, JP-A-5
2-122942, JP-A-57-37679, JP-A-5
In a known control method for an induction heating device such as that disclosed in Japanese Patent No. 9-59824, a control error is detected by a plate thermometer installed at the outlet of the induction heating device, and the power setting value for the induction heating device is corrected using so-called feedback control. , a method is adopted to suppress control errors, including those caused by changes in various conditions other than those caused by heat loss.
【００１４】しかしながら、このフィードバック制御方
式は、制御結果を検知してから制御操作量すなわち電力
値の修正を行う制御方式であるから、ストリップ上のあ
る点がコイル内を通過して加熱されている間は当然制御
不可能でありまた、その点がコイルを出て板温計で測温
され、制御誤差が検知されてから制御が作動して誤差が
抑制されるまでの間のロスタイムも存在するので、これ
らの間に処理されたストリップは場合によっては規定の
温度誤差範囲を外れてしまう。すなわち、定常部におい
ては本方法は有効であるが、ストリップのサイズや加熱
目標温度あるいは目標昇温量の変更部直後においては、
目標とする温度制御精度を保証し得るものではなく、し
たがって、熱損失分を考慮した電力値の設定が必要であ
る。However, since this feedback control method is a control method in which the control operation amount, that is, the power value is corrected after detecting the control result, a certain point on the strip passes through the inside of the coil and is heated. Of course, it is impossible to control the temperature at that point, and there is also a loss time between when the temperature at that point exits the coil and is measured with a plate temperature meter, and a control error is detected until the control is activated and the error is suppressed. Therefore, strips processed during these times may fall outside the specified temperature tolerance range. In other words, this method is effective in the steady state section, but immediately after the strip size, heating target temperature, or target temperature increase amount is changed,
It is not possible to guarantee the target temperature control accuracy, so it is necessary to set the power value in consideration of heat loss.
【００１５】これに対して、特開昭５４−２９１４１号
公報では熱損失分を補償する電力値を被加熱材の入口温
度、速度、目標昇温量から導出するようにしている。し
かし、熱損失分は被加熱材のサイズや加熱途中でのその
時々の被加熱材の温度と周囲温度との差及び通過時間に
依存するものであるから、被加熱材の入口温度、速度、
目標昇温量のみからでは、被加熱材のサイズや目標昇温
量あるいは加熱目標温度の変更に対しては、目標制御精
度を確保できるに充分な電力設定値を導出し得るもので
はない。特に、ストリップの連続焼鈍炉に設置される誘
導加熱装置では、ストリップのサイズの変更点や加熱目
標温度あるいは目標昇温量の変更が頻繁に行われるが、
この方法では各変更点直後において所望の温度制御精度
を得ることができず用を成さない。On the other hand, in Japanese Patent Application Laid-Open No. 54-29141, a power value for compensating for heat loss is derived from the inlet temperature of the material to be heated, the speed, and the target temperature increase amount. However, the amount of heat loss depends on the size of the material to be heated, the difference between the temperature of the material to be heated and the ambient temperature during heating, and the passage time.
From only the target temperature increase amount, it is not possible to derive a power setting value sufficient to ensure target control accuracy when changing the size of the material to be heated, the target temperature increase amount, or the heating target temperature. In particular, in induction heating equipment installed in continuous strip annealing furnaces, the size of the strip, the target heating temperature, or the target temperature increase amount are frequently changed.
This method is useless because the desired temperature control accuracy cannot be obtained immediately after each change point.
【００１６】また、特開昭５５−７８４９０号公報では
コイル間での冷却（熱損失分）の影響を目標温度設定を
調整することで補正するとあるが、この従来技術におい
ても特開昭５４−２９１４１について述べたことと同様
の理由があることに加えて、ストリップが誘導加熱装置
を通過中には、コイル間での熱損失分のみならずコイル
内での熱損失分もあるので、それが考慮されてない分が
制御誤差となる。よって、この方法も特開昭５４−２９
１４１と同様に、特に、ストリップの連続焼鈍炉に設置
される誘導加熱装置のようにストリップのサイズに変更
点や加熱目標温度あるいは目標昇温量の変更が頻繁に行
われるものに対しては、所望の温度制御精度を得るため
の電力設定値の導出方法を提供するものではない。Furthermore, in JP-A-55-78490, it is stated that the influence of cooling (heat loss) between coils is corrected by adjusting the target temperature setting; In addition to the same reasons as mentioned for 29141, as the strip passes through the induction heating device, there is heat loss not only between the coils but also within the coil. The amount not taken into consideration becomes a control error. Therefore, this method is also based on JP-A-54-29.
Similarly to 141, in particular, for devices where the size of the strip, heating target temperature, or target temperature increase amount is frequently changed, such as an induction heating device installed in a continuous annealing furnace for strip, It does not provide a method for deriving a power setting value to obtain desired temperature control accuracy.
【００１７】[0017]
【発明が解決しようとする課題】これに対し、本発明は
、ストリップのサイズや加熱目標温度あるいは目標昇温
量などの加熱状況の変化に対して柔軟性、即応性をもち
、コイル間空走部のみならずコイル部での熱損失分をも
考慮した、加熱目標温度あるいは目標昇温量を得るため
の誘導加熱装置への電力設定値の導出方法を提供するも
のである。[Problems to be Solved by the Invention] In contrast, the present invention has flexibility and responsiveness to changes in heating conditions such as strip size, heating target temperature, and target temperature increase amount, and eliminates the need for free running between coils. The present invention provides a method for deriving a power setting value for an induction heating apparatus in order to obtain a heating target temperature or a target temperature increase amount, taking into consideration not only the heat loss in the coil part but also the heat loss in the coil part.
【００１８】[0018]
【課題を解決するための手段】すなわち本発明は、複数
の加熱コイルがタンデム状に配列されかつ少なくとも１
ケ所のコイル間にサポートロールが設置されて空走部を
もつ誘導加熱装置にて、ストリップを搬送しながら加熱
し、所定の加熱温度あるいは所定の昇温量を確保する誘
導加熱装置の制御方法において、ストリップの加熱目標
温度または目標昇温量の変更部あるいはストリップのサ
イズ変更部が誘導加熱装置の入口に到達した際に、スト
リップのサイズ、各コイル部およびコイル間空送部に設
置した雰囲気温度計により検出した温度値に基づいて、
ストリップが誘導加熱装置入口から出口までを通過する
間に生じる熱損失分（温度降下分）を考慮した熱収支モ
デル式を用いて収束計算を行い、加熱目標温度または目
標昇温量を達成する誘導加熱装置への必要最適電力設定
値を求め設定することを特徴とする誘導加熱装置の制御
方法である。[Means for Solving the Problems] That is, the present invention provides a method in which a plurality of heating coils are arranged in tandem and at least one
In a control method for an induction heating device in which support rolls are installed between coils at multiple locations and the induction heating device has an idle running section, a strip is heated while being conveyed to ensure a predetermined heating temperature or a predetermined temperature increase amount. , When the strip heating target temperature or target temperature increase amount changing section or strip size changing section reaches the inlet of the induction heating device, the strip size, each coil section, and the ambient temperature installed in the inter-coil air feeding section Based on the temperature value detected by the meter,
A convergence calculation is performed using a heat balance model formula that takes into account the heat loss (temperature drop) that occurs while the strip passes from the inlet to the outlet of the induction heating device, and the induction method achieves the target heating temperature or target temperature increase. This is a method for controlling an induction heating device, characterized by determining and setting a required optimum power setting value for the heating device.
【００１９】[0019]
【作用】本発明法によれば、熱損失分を考慮した電力設
定値を求めるにあたって、熱損失分の導出にあたり重要
な要因となる雰囲気温度を実測して用い、かつ、誘導加
熱装置通過中に、その各過程においてストリップに与え
られる熱量とストリップが失う熱量を熱収支モデル式に
より算出して、総じて、所望の加熱目標温度あるいは目
標昇温量を得ることのできる必要電力値を導出するよう
にしているので、加熱目標温度あるいは目標昇温量の変
更に対して、柔軟に精度良く対応することができる。ま
た、熱収支モデル式にはストリップのサイズが考慮され
ているので、サイズの変更に対しても同様に柔軟に精度
良く対応することができる。したがって、その結果、ス
トリップのサイズの変更や加熱目標温度あるいは目標昇
温量の変更が頻繁に行われても、所望の温度制御精度を
得ることができる。[Operation] According to the method of the present invention, when determining the power setting value that takes heat loss into consideration, the ambient temperature, which is an important factor in deriving the heat loss, is actually measured and used, and the In each process, the amount of heat given to the strip and the amount of heat lost by the strip are calculated using a heat balance model formula, and the required power value that can obtain the desired heating target temperature or target temperature increase amount is derived as a whole. Therefore, it is possible to flexibly and accurately respond to changes in the heating target temperature or the target temperature increase amount. Furthermore, since the size of the strip is taken into consideration in the heat balance model equation, it is possible to respond flexibly and accurately to changes in size as well. Therefore, as a result, desired temperature control accuracy can be obtained even if the strip size, heating target temperature, or target temperature increase amount is frequently changed.
【００２０】[0020]
【実施例】本発明の具体的な実施方法を図２，図３に示
す。図２において、１はストリップ、２は加熱コイルお
よびコイルカバー、３，４は加熱コイル２に接続された
整合コンデンサー、インバーター装置である。５は加熱
コイル内部雰囲気温度を計測する温度計、６は各コイル
間の空走部の温度を計測する温度計、７は加熱装置入口
のストリップ温度を計測する温度計、８は加熱装置出口
のストリップ温度を計測する温度計、９はストリップの
処理速度を計測する速度計、１０は演算・判断処理装置
、１１は上位計算機である。１０と１１は同一計算機で
実現してもよい。[Example] A specific method of implementing the present invention is shown in FIGS. 2 and 3. In FIG. 2, 1 is a strip, 2 is a heating coil and a coil cover, 3 and 4 are matching capacitors connected to the heating coil 2, and an inverter device. 5 is a thermometer that measures the internal atmosphere temperature of the heating coil, 6 is a thermometer that measures the temperature of the free running part between each coil, 7 is a thermometer that measures the strip temperature at the heating device inlet, and 8 is a thermometer at the heating device outlet. 9 is a thermometer for measuring the strip temperature; 9 is a speedometer for measuring the processing speed of the strip; 10 is an arithmetic/judgment processing unit; and 11 is a host computer. 10 and 11 may be realized by the same computer.
【００２１】また、図３には、演算・判断処理装置１０
内での処理フローを示す。ストリップ１のサイズ変更部
あるいは目標加熱温度または目標昇温量の変更部が誘導
加熱装置入口温度計７に達したときに処理フローがスタ
ートし（１２）、ストリップの処理速度計９よりストリ
ップ１の実測速度を、また加熱装置入口の板温計７より
ストリップ１の加熱装置入口での実績温度を、また、各
温度計５，６よりコイル部およびコイル間空走部での雰
囲気温度の実測値を演算・判断処理装置１０に取り込む
と共に、上位計計算機１１からもストリップの断面積、
単位長当たりの表面積等の各データを演算・判断処理装
置１０に取り込む（１３）。FIG. 3 also shows an arithmetic/judgment processing device 10.
This shows the processing flow within. The processing flow starts when the size change part of the strip 1 or the target heating temperature or target temperature increase change part reaches the induction heating device inlet thermometer 7 (12), and the strip processing speed meter 9 indicates that the temperature of the strip 1 is Also, the actual temperature at the inlet of the heating device for strip 1 from the plate thermometer 7 at the inlet of the heating device, and the actual measured value of the ambient temperature at the coil section and the free running section between the coils from each thermometer 5 and 6. is input into the arithmetic/judgment processing device 10, and the cross-sectional area of the strip is also input from the host computer 11.
Each data such as surface area per unit length is taken into the arithmetic/judgment processing device 10 (13).
【００２２】次に、１４で温度積分計算の初期値Ｔ０
を誘導加熱装置入口温度ＴＥ とし、また１５にて温度
積分計算回数Ｎの初期値を０にセットして、ａ式計算部
１７、ｂ式計算部１８、ｃ式計算部１９にて第１区間で
の温度上昇量（温度降下量）を算出した後積分計算回数
Ｎを１増す（２０）。ここで、ｃ式計算部１９の処理に
おいては、１３で演算・判断処理装置１０に取り込んだ
温度計５，６により実測した雰囲気温度ＴＧ を用いる
。なお、上記の各計算部１７，１８，１９における計算
式は下記の数式３を用いる。Next, in step 14, the initial value T0 for temperature integral calculation is set.
is set as the induction heating device inlet temperature TE, and the initial value of the number of temperature integral calculations N is set to 0 in step 15. After calculating the amount of temperature increase (amount of temperature decrease) at , the number of integral calculations N is incremented by 1 (20). Here, in the processing of the c-formula calculation unit 19, the ambient temperature TG actually measured by the thermometers 5 and 6 taken into the arithmetic/judgment processing device 10 in step 13 is used. Note that the following formula 3 is used as the calculation formula in each of the calculation units 17, 18, and 19.
【００２３】[0023]
【数３】[Math 3]
【００２４】以降、Ｎが誘導加熱装置パス長さＬ（加熱
装置入口温度計測点から加熱装置出口温度管理点ー通常
、加熱装置出口温度計測点ーまでの距離）を温度計算１
区間の長さｌで割った値の整数分ＮＭＡＸ 以上になる
まで、１５，１６，１７，１８，１９，２０，２１，２
９の順序で計算処理を繰り返す。但し、ここで、加熱コ
イル部でない区間すなわち空走部に相当する区間の計算
をする場合には、加熱コイル区間判断部１６にて分岐し
、Ｔ０ がＴ２ に置き換えられ（２８）、１７，１８
をバイパスして１９に連結される。Hereinafter, N is the induction heating device path length L (distance from the heating device inlet temperature measurement point to the heating device outlet temperature control point - usually the heating device exit temperature measurement point). Temperature calculation 1
15, 16, 17, 18, 19, 20, 21, 2
Repeat the calculation process in the order of 9. However, when calculating a section that is not a heating coil section, that is, a section corresponding to an idle running section, the heating coil section judgment section 16 branches, and T0 is replaced with T2 (28), 17, 18.
It is connected to 19 by bypassing.
【００２５】一方、電力簡易算出部２５にて前に示した
数式１により、加熱目標温度あるいは目標昇温量を得る
ための必要総電力の粗値を求め、各誘導加熱装置への電
力配分方式に応じて、電力仮配分部２６にて各誘導加熱
装置への粗電力設定値ＰＰＲＯ を計算しておく。そし
て、各誘導加熱装置（コイル）に該当する区間の計算処
理において各々に対応する粗電力設定値ＰＰＲＯ を用
いる。また、各計算処理に用いる粗電力設定値ＰＰＲＯ
以外の諸データについても該当区間のものを用いるこ
とは言うまでもなく、また、各区間での比熱Ｃはその区
間での平均温度の関数とする。On the other hand, the simple power calculation unit 25 calculates the rough value of the total power required to obtain the heating target temperature or the target temperature increase amount using the formula 1 shown above, and determines the power distribution method to each induction heating device. Accordingly, the power provisional distribution unit 26 calculates the crude power set value PPRO to each induction heating device. Then, in the calculation process for the section corresponding to each induction heating device (coil), the corresponding crude power setting value PPRO is used. In addition, the crude power setting value PPRO used for each calculation process
It goes without saying that other data for the relevant section are used, and the specific heat C in each section is a function of the average temperature in that section.
【００２６】そしてＮがＮＭＡＸ に達したときには、
以上の温度積分計算処理（温度上昇量又は温度降下量の
積分計算）を終了し（２１）、最終計算値をＴＤ とし
て（２２）、ＴＤ と設定ＴＤ との差ＥＲＲ を算出
する（２３）。
ここで、ＥＲＲ が制御偏差許容値Ａを越えるならば（
２４）、電力修正部２７にてＥＲＲ に相当する分だけ
必要総電力の粗値を修正して再度電力仮配分を行う（２
６）と共に、修正後の粗電力設定値ＰＰＲＯ を用いて
再度前述した温度計算処理を行う。こうして、ＥＲＲ
がＡ以下になるまで以上の処理を繰り返す。ＥＲＲ が
Ａ以下になったら、そのときの各誘導加熱装置へ粗電力
設定値ＰＰＲＯ を正式な電力設定値ＰＳＥＴ として
（３０）、各誘導加熱装置（インバーター装置）へ出力
して（３１）、終了する（３２）。[0026] When N reaches NMAX,
The above temperature integral calculation process (integral calculation of temperature increase amount or temperature decrease amount) is completed (21), the final calculated value is set as TD (22), and the difference ERR between TD and the setting TD is calculated (23). Here, if ERR exceeds the control deviation tolerance value A (
24) The power correction unit 27 corrects the rough value of the total required power by an amount corresponding to the ERR and performs temporary power allocation again (2
6), the temperature calculation process described above is performed again using the corrected crude power set value PPRO. In this way, E.R.R.
The above process is repeated until A becomes less than or equal to A. When ERR becomes below A, output the crude power setting value PPRO to each induction heating device as the official power setting value PSET (30) and output it to each induction heating device (inverter device) (31), and end. Do (32).
【００２７】以上が、本発明の具体的実施方法であるが
、処理の中で用いるＮＭＡＸ および制御偏差許容値Ａ
について補足するならば、ＮＭＡＸ は要求される制御
精度と計算機への負荷を考慮して決めるのが望ましく、
また、更に、制御精度に大きく影響するコイル部での加
熱効率やコイル部及び空走部での総括熱伝達係数等の未
知パラメータは、コイル部や空送部等各ゾーン後との区
画において、カルマンフィルタ等を使用して推定、学習
することにより効果的に求めることができる。The above is a concrete implementation method of the present invention. NMAX and control deviation tolerance value A used in the process
As a supplementary note, it is desirable to determine NMAX by considering the required control accuracy and the load on the computer.
Furthermore, unknown parameters such as the heating efficiency in the coil section and the overall heat transfer coefficient in the coil section and the free running section, which greatly affect control accuracy, are It can be effectively determined by estimation and learning using a Kalman filter or the like.
【００２８】また、制御偏差許容値Ａは、温度計算式に
用いる諸データの誤差や温度計算式そのものの精度を考
慮して、実際の制御偏差許容値よりも小さく設定する方
が望ましいが、過度に小さくし過ぎると計算が収束しな
い危険性が高く、又、計算機への負荷が大きくなるなど
弊害が生じるので、これらを考慮して設定しなければな
らない。Furthermore, it is preferable to set the control deviation allowable value A to be smaller than the actual control deviation allowable value, taking into account the errors in various data used in the temperature calculation formula and the accuracy of the temperature calculation formula itself. If it is set too small, there is a high risk that the calculation will not converge, and there will be problems such as an increase in the load on the computer, so these must be taken into consideration when setting.
【００２９】なお、目標昇温量に対して電力設定値を導
出する場合には、図３の２３において、ＥＲＲ ＝（Ｔ
Ｄ −ＴＥＪ）−ΔＴＳＥＴ とすればよい。なお、Ｔ
Ｄ は計算加熱温度、ＴＥＪは誘導加熱装置入口実測板
温、ΔＴＳＥＴ は目標昇温量である。Note that when deriving the power setting value for the target temperature increase amount, at 23 in FIG. 3, ERR = (T
D - TEJ) - ΔTSET. In addition, T
D is the calculated heating temperature, TEJ is the actually measured plate temperature at the entrance of the induction heating device, and ΔTSET is the target temperature increase amount.
【００３０】[0030]
【発明の効果】以上述べた本発明法によれば、熱損失分
を考慮した電力設定値を求めるにあたって、熱損失分の
導出に当たり重要な要因となる雰囲気温度を実測して用
い、かつ、誘導加熱装置通過中に、その各過程において
ストリップに与えられる熱量とストリップが失う熱量を
熱収支モデル式により算出して、総じて、所望の加熱目
標温度あるいは目標昇温量を得ることのできる必要電力
値を導出するようにしているので、加熱目標温度あるい
は目標昇温量の変更に対して、柔軟に精度よく対応する
ことができ、また、熱収支モデル式にはストリップのサ
イズが考慮されているので、サイズの変更に対しても同
様に柔軟に精度よく対応することができるので、ストリ
ップのサイズの変更や加熱目標温度あるいは目標昇温量
の変更が頻繁に行なわれる場合でも所望の温度制御精度
を得ることができる。[Effects of the Invention] According to the method of the present invention described above, when determining a power setting value that takes heat loss into consideration, the ambient temperature, which is an important factor in deriving the heat loss, is actually measured and used. Calculate the amount of heat given to the strip and the amount of heat lost by the strip in each process while passing through the heating device using a heat balance model formula, and calculate the required power value that can obtain the desired heating target temperature or target temperature increase amount as a whole. This allows us to respond flexibly and accurately to changes in the heating target temperature or target temperature increase amount, and since the heat balance model formula takes the strip size into account. , it is possible to respond flexibly and accurately to changes in size, so even if the strip size, heating target temperature, or target temperature increase amount is frequently changed, the desired temperature control accuracy can be maintained. Obtainable.
【図１】誘導加熱装置のレイアウト図。FIG. 1 is a layout diagram of an induction heating device.
【図２】本発明の具体的な実施方法を説明する図。FIG. 2 is a diagram illustrating a specific implementation method of the present invention.
【図３】本発明方法の制御フロー図。FIG. 3 is a control flow diagram of the method of the present invention.
１ ストリップ ２ 加熱コイル ３ 整合コンデンサー ４ インバーター ５〜８ 温度計 ９ 速度計 １０ 演算・判断処理装置 １１ 上位計算機 1 Strip 2 Heating coil 3 Matching capacitor 4 Inverter 5-8 Thermometer 9 Speedometer 10 Arithmetic/judgment processing device 11 Upper-level computer
Claims (1)
されかつ少なくとも１ケ所のコイル間にサポートロール
が設置されて空走部をもつ誘導加熱装置にて、ストリッ
プを搬送しながら加熱し、所定の加熱温度あるいは所定
の昇温量を確保する誘導加熱装置の制御方法において、
ストリップの加熱目標温度または目標昇温量の変更部あ
るいはストリップのサイズ変更部が誘導加熱装置の入口
に到達した際に、ストリップのサイズ、各コイル部およ
びコイル間空送部に設置した雰囲気温度計により検出し
た温度値に基づいて、ストリップが誘導加熱装置入口か
ら出口までを通過する間に生じる熱損失分（温度降下分
）を考慮した熱収支モデル式を用いて収束計算を行い、
加熱目標温度または目標昇温量を達成する誘導加熱装置
への必要最適電力設定値を求め設定することを特徴とす
る誘導加熱装置の制御方法。Claim 1: A strip is heated while being conveyed by an induction heating device in which a plurality of heating coils are arranged in tandem, a support roll is installed between at least one coil, and has an idle running section. In a method of controlling an induction heating device to ensure a heating temperature or a predetermined temperature increase amount,
When the strip heating target temperature or target temperature increase amount changing section or the strip size changing section reaches the inlet of the induction heating device, the strip size, each coil section, and the atmosphere thermometer installed in the inter-coil air feeding section are detected. Based on the temperature value detected by
A method for controlling an induction heating device, comprising determining and setting an optimum power setting value required for the induction heating device to achieve a heating target temperature or a target temperature increase amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2404555A JP2523991B2 (en) | 1990-12-20 | 1990-12-20 | Control method for induction heating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2404555A JP2523991B2 (en) | 1990-12-20 | 1990-12-20 | Control method for induction heating device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04221027A true JPH04221027A (en) | 1992-08-11 |
| JP2523991B2 JP2523991B2 (en) | 1996-08-14 |
Family
ID=18514216
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2404555A Expired - Lifetime JP2523991B2 (en) | 1990-12-20 | 1990-12-20 | Control method for induction heating device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2523991B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104694732A (en) * | 2015-03-20 | 2015-06-10 | 江苏金基特钢有限公司 | Steel wire induction-heating device |
| JP2021109990A (en) * | 2020-01-08 | 2021-08-02 | Ｊｆｅスチール株式会社 | Plate temperature control method, heating control device and method for producing metal plate |
-
1990
- 1990-12-20 JP JP2404555A patent/JP2523991B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104694732A (en) * | 2015-03-20 | 2015-06-10 | 江苏金基特钢有限公司 | Steel wire induction-heating device |
| JP2021109990A (en) * | 2020-01-08 | 2021-08-02 | Ｊｆｅスチール株式会社 | Plate temperature control method, heating control device and method for producing metal plate |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2523991B2 (en) | 1996-08-14 |
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