JP2003187951A - Heating device of metal belt plate having excellent uniform heating in width direction - Google Patents
Heating device of metal belt plate having excellent uniform heating in width directionInfo
- Publication number
- JP2003187951A JP2003187951A JP2001381660A JP2001381660A JP2003187951A JP 2003187951 A JP2003187951 A JP 2003187951A JP 2001381660 A JP2001381660 A JP 2001381660A JP 2001381660 A JP2001381660 A JP 2001381660A JP 2003187951 A JP2003187951 A JP 2003187951A
- Authority
- JP
- Japan
- Prior art keywords
- coil
- induction heating
- metal strip
- magnetic field
- 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
Links
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)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、板幅方向の均温性
に優れた金属帯板の加熱装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating device for a metal strip having excellent temperature uniformity in the width direction.
【０００２】[0002]
【従来の技術】誘導加熱とは、交流電源に接続されたコ
イルを被加熱物の周囲に配置し、交番磁界により誘起さ
れる渦電流のジュール熱により物体を加熱する方法であ
る。誘導加熱には、交番磁界を被加熱物に垂直に交差さ
せるトランスバース方式と、コイルで被加熱物を巻くよ
うに配置して、交番磁界を被加熱物に平行に印加するソ
レノイド方式の２通りがあり、目的によって選択され
る。金属帯板の加熱の場合、板幅方向に均一な加熱が必
要なことから、ソレノイド方式が適している。また、ソ
レノイド方式には、１つの電源に対して、複数回コイル
を巻くマルチターン方式と、１回だけ巻くシングルター
ン方式がある。従来のソレノイド方式のシングルターン
コイルを用いる誘導加熱装置は、金属帯板が、例えば磁
性体の鋼帯である場合、キュリー点（約７５０℃）以上
の加熱が困難であり、６５０℃以下の低温領域での加熱
にしか適用できないという問題点があった。さらに、金
属帯板が、例えばアルミ, ＳＵＳ等の非磁性体である場
合、加熱すること自体が困難であった。2. Description of the Related Art Induction heating is a method in which a coil connected to an AC power source is arranged around an object to be heated and an object is heated by Joule heat of an eddy current induced by an alternating magnetic field. Two types of induction heating are available: a transverse method in which an alternating magnetic field intersects the object to be heated perpendicularly, and a solenoid method in which the object is heated by a coil and the alternating magnetic field is applied in parallel to the object. And is selected according to the purpose. In the case of heating the metal strip, the solenoid method is suitable because uniform heating in the width direction is required. Further, the solenoid system includes a multi-turn system in which a coil is wound a plurality of times and a single-turn system in which a coil is wound only once for one power source. In a conventional induction heating device using a solenoid-type single-turn coil, when the metal strip is, for example, a magnetic steel strip, it is difficult to heat above the Curie point (about 750 ° C), and the temperature is below 650 ° C. There is a problem that it can be applied only to heating in the area. Furthermore, when the metal strip is a non-magnetic material such as aluminum or SUS, it is difficult to heat the strip itself.
【０００３】磁性体帯板のキュリー点以上の加熱が困難
な理由は、キュリー点付近の温度になると渦電流の電流
浸透深さが大きくなり、板幅方向断面の表層部を一周し
ている渦電流の表裏相殺が発生し、渦電流が流れなくな
るからである。また、非磁性体帯板を加熱すること自体
が困難になる理由は、常温レベルから渦電流の電流浸透
深さが大きく、板幅方向断面の表層部を一周している渦
電流の表裏相殺が発生し、渦電流が流れないからであ
る。発明者らは、この問題点を解決する方法として先に
図１のように金属帯板１の上面のシングルターン誘導加
熱コイル２と下面のシングルターン誘導加熱コイル３と
を、金属帯板１の長手方向に互いにシフトさせることに
より、板幅方向断面の表層部を一周している渦電流の表
裏相殺をなくす方法を見出して、特願２０００-２８９
１４５号の特許出願を行った。The reason why it is difficult to heat above the Curie point of the magnetic strip is that when the temperature near the Curie point is reached, the current penetration depth of the eddy current increases, and the vortex that surrounds the surface layer portion of the cross section in the plate width direction. This is because the front and back of the currents cancel each other and the eddy current stops flowing. Further, it is difficult to heat the non-magnetic strip itself because the eddy current has a large current penetration depth from the room temperature level, and the front and back of the eddy current that surrounds the surface layer of the cross section in the plate width direction cancels each other. This is because eddy currents do not flow. As a method for solving this problem, the inventors first set the single-turn induction heating coil 2 on the upper surface of the metal strip 1 and the single-turn induction heating coil 3 on the lower surface of the metal strip 1 as shown in FIG. A method for eliminating front and back offset of the eddy currents that go around the surface layer portion of the cross section in the plate width direction by shifting each other in the longitudinal direction was found, and Japanese Patent Application No. 2000-289 was found.
145 filed a patent application.
【０００４】この方法によって、鋼板をキュリー点（７
５０℃）以上に加熱することができ、非磁性体も加熱す
ることができるようになったが、誘導加熱のコイルサイ
ズを大きくし、鋼板を挟む上下のコイル間のギャップを
６ｍｍから３０ｍｍに拡大して、加熱中における鋼帯の
幅方向の温度分布を測定したところ図２に示すように、
以下の問題点が明らかになった。なお、図２の横軸は加
熱時間（秒）であり、縦軸は加熱温度（℃）である。
（問題１）６００℃以下の低温加熱領域においても、鋼
帯の幅方向の温度偏差が生じた。
（問題２）キュリー点（７５０℃）付近では鋼帯中央部
の加熱がしにくく、加熱温度がキュリー点に達しなか
った。
（問題３）鋼帯エッジ部の温度が８００℃を超えてお
り、エッジ部の過加熱が大きくなった。By this method, the steel sheet is cut to a Curie point (7
It is possible to heat above 50 ° C) and to heat non-magnetic materials as well, but the coil size for induction heating is increased and the gap between the upper and lower coils that sandwich the steel plate is expanded from 6 mm to 30 mm. Then, when the temperature distribution in the width direction of the steel strip during heating was measured, as shown in FIG.
The following problems became clear. The horizontal axis of FIG. 2 represents the heating time (second), and the vertical axis represents the heating temperature (° C.). (Problem 1) Even in a low temperature heating region of 600 ° C. or less, temperature deviation in the width direction of the steel strip occurred. (Problem 2) It was difficult to heat the central portion of the steel strip near the Curie point (750 ° C.), and the heating temperature did not reach the Curie point. (Problem 3) The temperature of the edge portion of the steel strip exceeds 800 ° C., and the overheating of the edge portion becomes large.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、前記のよう
な従来技術の問題点を解決し、鋼帯をキュリー点（７５
０℃）以上に加熱でき、非磁性体も加熱でき、しかも、
板幅方向の均温性に優れた金属帯板の加熱装置を提供す
ることを課題とする。DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art and makes the steel strip have a Curie point (75).
(0 ° C) or higher, can heat non-magnetic materials, and
An object of the present invention is to provide a heating device for a metal strip excellent in temperature uniformity in the plate width direction.
【０００６】[0006]
【課題を解決するための手段】発明者らは、金属帯板の
幅方向の温度偏差が生じる原因を鋭意検討した結果、以
下のことが判明した。コイルサイズが大きくなると、コ
ア厚ｈが大きくなるため、エッジ部で渦電流の縮流長が
長くなって発熱量が多くなる。一方、中央部では、磁場
が拡散するために、同一投入電力では、磁束密度が小さ
くなるために、渦電流密度が低下して発熱量が小さくの
で、コイルサイズを大きくするに従って、エッジ部と中
央部の温度偏差が大きくなる。その結果、低温度付近か
らエッジ部の温度が過加熱気味となり、温度が上がると
その部分の抵抗は更に上がるため、高温度付近では、そ
の相乗効果で、極端にエッジ部の過加熱が発生すること
がわかった。Means for Solving the Problems As a result of intensive studies on the cause of the temperature deviation in the width direction of the metal strip, the inventors have found the following. As the coil size increases, the core thickness h increases, so that the contraction length of the eddy current at the edge portion increases and the amount of heat generation increases. On the other hand, in the central part, since the magnetic field is diffused, the magnetic flux density becomes smaller at the same applied power, so the eddy current density decreases and the amount of heat generation becomes smaller. The temperature deviation of the part becomes large. As a result, the temperature of the edge part tends to overheat from around the low temperature, and when the temperature rises, the resistance of that part further rises, so near the high temperature, the synergistic effect causes extreme overheating of the edge part. I understood it.
【０００７】そこで、発明者らは、低温度付近では、加
熱の均温性のよい加熱方式を採用することで、低温度付
近からエッジ部の過加熱を防止するとともに、シングル
ターンコイルの電流の向きと反対方向の電流が流れる磁
場拡散防止コイルを設置して、中央部の磁束密度を大き
くし中央部の発熱量を増加させ、さらに、エッジ部過加
熱防止装置を設置することで、金属帯板の表裏を迂回し
て流れるエッジ部の渦電流の分流を行うことにより、エ
ッジ部の発熱量を低下させる方法を見出した。本発明の
要旨とするところは、許請求の範囲に記載した通りの下
記内容である。[0007] Therefore, the inventors have adopted a heating system having good temperature uniformity in the vicinity of a low temperature to prevent overheating of the edge portion from the vicinity of the low temperature and to reduce the current of the single turn coil. By installing a magnetic field diffusion prevention coil through which a current flows in the opposite direction, increasing the magnetic flux density in the central part and increasing the amount of heat generation in the central part, and further installing the edge part overheating prevention device, We have found a method to reduce the amount of heat generated at the edges by shunting the eddy currents at the edges that bypass the front and back of the plate. The gist of the present invention is the following contents as described in the claims.
【０００８】（１）ソレノイド方式の誘導加熱コイルま
たは接触方式の通電加熱ロールと、シングルターン誘導
加熱コイルと、該シングルターン誘導加熱コイルの電流
と逆方向に電流を流すことにより磁場の拡散を防止する
磁場拡散防止コイルとを設けた金属帯板の加熱装置であ
って、該金属帯板の上面のシングルターン誘導加熱コイ
ルおよび磁場拡散防止コイルと、該金属帯板の下面のシ
ングルターン誘導加熱コイルおよび磁場拡散防止コイル
とを該金属帯板の長手方向に互いにシフトした位置に配
置することを特徴とする板幅方向の均温性に優れた金属
帯板の加熱装置。(1) A solenoid type induction heating coil or a contact type electric heating roll, a single-turn induction heating coil, and a current flowing in a direction opposite to the current of the single-turn induction heating coil prevent diffusion of a magnetic field. A device for heating a metal strip provided with a magnetic field diffusion prevention coil, the single-turn induction heating coil and the magnetic field diffusion prevention coil on the upper surface of the metal strip, and the single-turn induction heating coil on the lower surface of the metal strip. A heating device for a metal strip excellent in temperature uniformity in the width direction of the metal strip, wherein the coil and the magnetic field diffusion prevention coil are arranged at positions shifted from each other in the longitudinal direction of the metal strip.
【０００９】（２）さらに、前記シングルターン誘導加
熱コイルに、該シングルターン誘導加熱コイルの電流と
同方向に電流を流すことにより前記金属帯板のエッジ部
の渦電流を分流して該エッジ部の過加熱を防止するエッ
ジ部過加熱防止コイルを設けることを特徴とする（１）
に記載の板幅方向の均温性に優れた金属帯板の加熱装
置。
（３）前記金属帯板の上面のエッジ部過加熱防止コイル
と、該金属帯板の下面のエッジ部過加熱防止コイルとを
該金属帯板の長手方向に互いにシフトした位置に配置す
ることを特徴とする（２）に記載の板幅方向の均温性に
優れた金属帯板の加熱装置。(2) Further, by passing a current through the single-turn induction heating coil in the same direction as the current of the single-turn induction heating coil, the eddy current at the edge portion of the metal strip is shunted to divide the edge portion. Is provided with an edge portion overheating prevention coil for preventing overheating of (1)
The heating device for a metal strip excellent in temperature uniformity in the plate width direction according to. (3) Arranging the edge overheating prevention coil on the upper surface of the metal strip and the edge overheating prevention coil on the lower surface of the metal strip at positions shifted from each other in the longitudinal direction of the metal strip. The heating device for a metal strip excellent in temperature uniformity in the plate width direction according to (2).
【００１０】[0010]
【発明の実施の形態】本発明の実施の形態を、図３乃至
図１０を用いて詳細に説明する。
（第１の実施形態）本発明の第１の実施形態として、磁
場拡散防止コイル４，５を設けた例を図３乃至図５に示
す。図３は、本発明における金属帯板の加熱装置の実施
形態を例示する図である。金属鋼帯１は、渦電流が板幅
方向の断面内を流れることから板幅方向の均一加熱性に
優れるソレノイド方式誘導加熱コイル６にて、６００℃
程度まで加熱される。これと同じく、板幅方向の均一加
熱性に優れる接触方式の通電加熱ロールを用いてもよ
い。ここに、通電加熱ロールとは、金属帯板に接触する
ロールであって、このロールから金属帯板に直接電流を
流して、そのジュール熱により金属帯板を加熱するもの
である。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail with reference to FIGS. (First Embodiment) As a first embodiment of the present invention, an example in which magnetic field diffusion prevention coils 4 and 5 are provided is shown in FIGS. FIG. 3 is a diagram illustrating an embodiment of a heating device for a metal strip according to the present invention. The metal steel strip 1 has a solenoid type induction heating coil 6 which is excellent in uniform heating property in the plate width direction because the eddy current flows in the cross section in the plate width direction.
Heated to a degree. Similarly to this, a contact-type electric heating roll having excellent uniform heating property in the plate width direction may be used. Here, the electric heating roll is a roll that comes into contact with the metal strip, and a current is directly applied from the roll to the metal strip to heat the metal strip by its Joule heat.
【００１１】ソレノイド方式誘導加熱コイル６の後段に
は、シングルターン誘導加熱コイル２，３が設置されて
おり、その横に、シングルターン誘導加熱コイル２，３
とはそれぞれ逆向きの電流を流すことにより磁場の拡散
を防止する磁場拡散防止コイル４,５が設けられてい
る。この磁場拡散防止コイル４,５により、キュリー点
（７５０℃）付近の加熱において磁場の拡散を防止する
ことにより、板幅方向の中央部分における磁束密度の低
下を防ぎ、板幅方向の中央部分の加熱温度を高めること
ができる。図４は、本発明における金属帯板の加熱装置
における第１の実施形態の鋼帯の長手方向の断面図であ
る。Single-turn induction heating coils 2 and 3 are installed after the solenoid type induction heating coil 6, and next to them, single-turn induction heating coils 2 and 3 are provided.
Magnetic field diffusion prevention coils 4 and 5 are provided to prevent diffusion of the magnetic field by passing currents in the opposite directions. The magnetic field diffusion prevention coils 4 and 5 prevent the magnetic field from diffusing during heating near the Curie point (750 ° C.), thereby preventing a decrease in the magnetic flux density in the central portion in the plate width direction, The heating temperature can be increased. FIG. 4 is a cross-sectional view in the longitudinal direction of the steel strip of the first embodiment in the metal strip heating apparatus according to the present invention.
【００１２】鋼帯１の上面のシングルターン誘導加熱コ
イル２および磁場拡散防止コイル４と、鋼帯１の下面の
シングルターン誘導加熱コイル３および磁場拡散防止コ
イル５とをそれぞれ鋼帯１の長手方向に互いにシフトし
た位置に配置しているので、板幅方向断面の表層部を一
周している渦電流の表裏相殺が発生しないことから、キ
ュリー点（７５０℃）以上に加熱することができる。ま
た、アルミやＳＵＳ等の非磁性体を加熱することもでき
る。また、磁場を集中させ（磁束密度を高め）、加熱効
率を向上させるために、シングルターン誘導加熱コイル
２,３の鋼帯への対向面を除く外周３面を比透磁率が２
５００と高く、高抵抗率のフェライトコア９で直接被覆
することが好ましい。The single-turn induction heating coil 2 and the magnetic field diffusion prevention coil 4 on the upper surface of the steel strip 1 and the single-turn induction heating coil 3 and the magnetic field diffusion prevention coil 5 on the lower surface of the steel strip 1 are respectively arranged in the longitudinal direction of the steel strip 1. Since they are arranged at positions shifted from each other, front and back offset of the eddy currents that go around the surface layer portion of the cross section in the plate width direction does not occur, so that it is possible to heat above the Curie point (750 ° C.). It is also possible to heat a non-magnetic material such as aluminum or SUS. Further, in order to concentrate the magnetic field (increase the magnetic flux density) and improve the heating efficiency, the outer peripheral surfaces of the single-turn induction heating coils 2 and 3 excluding the surface facing the steel strip have a relative magnetic permeability of 2
It is preferable to directly coat the ferrite core 9 having a high resistivity of 500 and a high resistivity.
【００１３】図５は、本発明における金属帯板の加熱装
置における第１の実施形態を用いて、鋼帯を加熱したと
きの、板幅方向の温度分布の変化を示す図である。板幅
70ｍｍ, 厚さ0.35ｍｍの鋼板を用い、板速70ｍｍ/秒,
周波数20KHz, 電源出力50KW, コイル幅W:40ｍｍ, コア
厚ｈ:20ｍｍ, ギャップG:30ｍｍにて加熱を行った。先
願の板幅方向温度分布を示す図２と比較して、６００℃
以下の低温部における板幅方向の温度偏差がなくなり、
キュリー点（７５０℃）付近における板幅方向の中央部
における加熱温度が著しく高くなっている。なお、図５
における、エッジ部の加熱温度が高くなっており、エッ
ジ部の過加熱現象が一部残っているが、これは、鋼帯の
エッジ部の上下面に銅板を設置して磁場を遮蔽すること
により、防止することができる。FIG. 5 is a diagram showing changes in temperature distribution in the plate width direction when the steel strip is heated using the first embodiment of the heating apparatus for metal strips according to the present invention. Board width
70 mm, 0.35 mm thick steel plate, plate speed 70 mm / sec,
Heating was performed at a frequency of 20 KHz, power output of 50 KW, coil width W: 40 mm, core thickness h: 20 mm, gap G: 30 mm. Compared to FIG. 2 showing the temperature distribution in the plate width direction of the previous application, 600 ° C.
There is no temperature deviation in the width direction in the low temperature part below,
The heating temperature in the central portion in the plate width direction near the Curie point (750 ° C.) is extremely high. Note that FIG.
, The heating temperature of the edge part is high, and some overheating phenomenon of the edge part remains, but this is because the copper plate is installed on the upper and lower surfaces of the edge part of the steel strip to shield the magnetic field. , Can be prevented.
【００１４】（第２の実施形態）本発明の第２の実施形
態として、磁場拡散防止コイル４，５およびエッジ部過
加熱防止コイル７，８を設けた例を図６乃至図１０に示
す。図６は、本発明における金属帯板の加熱装置の第２
の実施形態を例示する図である。金属鋼帯１は、渦電流
が板幅方向の断面内を流れることから板幅方向の均一加
熱性に優れるソレノイド方式誘導加熱コイル６にて、６
００℃程度まで加熱される。これと同じく、板幅方向の
均一加熱性に優れる接触式通電加熱ロールを用いてもよ
い。(Second Embodiment) As a second embodiment of the present invention, an example in which magnetic field diffusion prevention coils 4, 5 and edge portion overheating prevention coils 7, 8 are provided is shown in FIGS. 6 to 10. FIG. 6 shows a second heating device for a metal strip according to the present invention.
It is a figure which illustrates the embodiment of. The metal steel strip 1 has a solenoid type induction heating coil 6 which is excellent in uniform heating property in the plate width direction because the eddy current flows in the cross section in the plate width direction.
It is heated to about 00 ° C. Similarly to this, a contact-type current-carrying heating roll which is excellent in uniform heating in the plate width direction may be used.
【００１５】ソレノイド方式誘導加熱コイル６の後段に
は、シングルターン誘導加熱コイル２，３が設置されて
おり、その横に、シングルターン誘導加熱コイル２，３
とはそれぞれ逆向きの電流を流すことにより磁場の拡散
を防止する磁場拡散防止コイル４、５が設けられてい
る。この磁場拡散防止コイル４,５により、キュリー点
（７５０℃）付近の加熱において磁場の拡散を防止する
ことにより、板幅方向の中央部分の磁束密度の低下を防
ぎ、板幅方向の中央部分の加熱温度を高めることができ
る。ソレノイド方式誘導加熱コイル６とシングルターン
誘導加熱コイル２，３の間には、シングルターン誘導加
熱コイル２，３の電流とそれぞれ同方向に電流を流すこ
とにより金属帯板のエッジ部の渦電流を分流して該エッ
ジ部の過加熱を防止するエッジ部過加熱防止コイル７,
８が設けられている。このエッジ部過加熱防止コイル
７,８により、エッジ部の渦電流を分流することによ
り、エッジ部の渦電流の縮流現象を緩和して、エッジ部
の過加熱を著しく抑制することができる。Single-turn induction heating coils 2 and 3 are installed after the solenoid type induction heating coil 6, and beside the single-turn induction heating coils 2 and 3.
Magnetic field diffusion prevention coils 4 and 5 are provided to prevent diffusion of the magnetic field by passing currents in opposite directions. The magnetic field diffusion prevention coils 4 and 5 prevent the magnetic field from diffusing during heating near the Curie point (750 ° C.), thereby preventing a decrease in the magnetic flux density in the central portion in the plate width direction and reducing the magnetic flux density in the central portion in the plate width direction. The heating temperature can be increased. Between the solenoid type induction heating coil 6 and the single-turn induction heating coils 2 and 3, currents are made to flow in the same directions as the currents of the single-turn induction heating coils 2 and 3, respectively, so that an eddy current at the edge of the metal strip is generated. Edge overheating prevention coil 7 for shunting to prevent overheating of the edge portion,
8 are provided. By distributing the eddy current in the edge portion by the edge portion overheating prevention coils 7 and 8, it is possible to alleviate the contraction phenomenon of the eddy current in the edge portion and significantly suppress the overheating of the edge portion.
【００１６】図７は、本発明における金属帯板の加熱装
置の第２の実施形態を例示する図であり、シングルター
ン誘導加熱コイル２，３と、エッジ部過加熱防止コイル
７，８の電源を共通にした例である。これにより、電源
装置の設置台数を低減することにより設備費を下げるこ
とができる。図８は、本発明における金属帯板の加熱装
置の第２の実施形態を例示する図であり、シングルター
ン誘導加熱コイル２,３, エッジ部過加熱防止コイル
７，８,ソレノイド方式の誘導加熱コイル６の電源を全
て共通化した例である。これにより、さらに、電源装置
の設置台数を低減することにより設備費を下げることが
できる。FIG. 7 is a diagram illustrating a second embodiment of the heating apparatus for a metal strip according to the present invention, in which power supplies for the single-turn induction heating coils 2 and 3 and the edge portion overheating prevention coils 7 and 8 are provided. Is a common example. As a result, the equipment cost can be reduced by reducing the number of installed power supply devices. FIG. 8: is a figure which illustrates 2nd Embodiment of the heating device of the metal strip in this invention, The single-turn induction heating coil 2,3, edge part overheating prevention coil 7,8, solenoid type induction heating. This is an example in which the power sources of the coils 6 are all common. As a result, it is possible to further reduce the equipment cost by reducing the number of installed power supply devices.
【００１７】図９は、本発明における金属帯板の加熱装
置における第２の実施形態の鋼帯の長手方向の断面図で
ある。鋼帯１の上面のシングルターン誘導加熱コイル
２,磁場拡散防止コイル４,およびエッジ部過加熱防止コ
イル７と、鋼帯１の下面のシングルターン誘導加熱コイ
ル３,磁場拡散防止コイル５およびエッジ部過加熱防止
コイル７とをそれぞれ鋼帯１の長手方向に互いにシフト
した位置に配置しているので、板幅方向断面の表層部を
一周している渦電流の表裏相殺が発生しないことから、
キュリー点（７５０℃）以上に加熱することができる。
また、アルミやＳＵＳ等の非磁性体を加熱することもで
きる。FIG. 9 is a longitudinal sectional view of a steel strip according to the second embodiment of the heating apparatus for metal strips of the present invention. Single-turn induction heating coil 2, magnetic field diffusion prevention coil 4, and edge portion overheating prevention coil 7 on the upper surface of steel strip 1, and single-turn induction heating coil 3, magnetic field diffusion prevention coil 5, and edge portion on the lower surface of steel strip 1. Since the overheating prevention coil 7 and the overheating prevention coil 7 are arranged at positions shifted from each other in the longitudinal direction of the steel strip 1, the front and back of the eddy currents that go around the surface layer portion of the cross section in the plate width direction do not occur.
It can be heated above the Curie point (750 ° C.).
It is also possible to heat a non-magnetic material such as aluminum or SUS.
【００１８】ソレノイド方式誘導加熱コイル６とシング
ルターン誘導加熱コイル２，３の間には、シングルター
ン誘導加熱コイル２，３の電流とそれぞれ同方向に電流
を流すエッジ部過加熱防止コイル７,８が設けられてい
る。例えば、シングルターン誘導加熱コイル２，３に全
体の７０％の電流を流し、残り３０％の電流を金属帯板
の長手方向にずれた位置に設置されているエッジ部過加
熱防止コイル７,８に分流することにより、帯板のエッ
ジ部に発生する渦電流の縮流によるエッジ過熱は電流の
二乗で効いてくるのでエッジ過熱を約５０％（0.7*0.7
＝0.49）に低減することができる。また、磁場を集中さ
せ（磁束密度を高め）、加熱効率を向上させるために、
シングルターン誘導加熱コイル２,３の鋼帯への対向面
を除く外周３面を、比透磁率が２５００と高く、高抵抗
率のフェライトコア９で直接被覆することが好ましい。Between the solenoid type induction heating coil 6 and the single-turn induction heating coils 2 and 3, the edge portion overheating prevention coils 7 and 8 are supplied with currents in the same directions as the currents of the single-turn induction heating coils 2 and 3, respectively. Is provided. For example, an electric current of 70% of the whole is passed through the single-turn induction heating coils 2 and 3, and the remaining 30% of the electric current is placed in positions displaced in the longitudinal direction of the metal strip plate. The edge overheating due to the contraction of the eddy current generated at the edge of the strip becomes effective by the square of the current, so the edge overheating is about 50% (0.7 * 0.7).
= 0.49). Also, in order to concentrate the magnetic field (increasing the magnetic flux density) and improve the heating efficiency,
It is preferable to directly coat the outer three surfaces of the single-turn induction heating coils 2 and 3 excluding the surface facing the steel strip with the ferrite core 9 having a high relative magnetic permeability of 2500 and a high resistivity.
【００１９】さらに、エッジ部を通過する渦電流の分流
量を調整するために、エッジ部過加熱防止コイル８の鋼
帯への対向面を除く外周３面を、比透磁率が２５００と
高く、高抵抗率のフェライトコア９で直接被覆すること
が好ましい。図１０は、本発明における金属帯板の加熱
装置を用いて、鋼帯を加熱したときの、板幅方向の温度
分布の変化を示す図である。板幅70ｍｍ,厚さ0.35ｍｍ
の鋼板を用い、板速70ｍｍ/秒,周波数20KHz,電源出力50
KW,コイル幅W：40ｍｍ,コア厚ｈ：20ｍｍ,ギャップG：3
0ｍｍにて加熱を行った。Furthermore, in order to adjust the partial flow rate of the eddy current passing through the edge portion, the outer peripheral surface of the edge portion overheating prevention coil 8 excluding the surface facing the steel strip has a high relative magnetic permeability of 2500, It is preferable to directly coat the ferrite core 9 having a high resistivity. FIG. 10: is a figure which shows the change of temperature distribution of a plate width direction when heating a steel strip using the heating device of the metal strip plate in this invention. Board width 70 mm, thickness 0.35 mm
70mm / sec, frequency 20KHz, power output 50
KW, coil width W: 40 mm, core thickness h: 20 mm, gap G: 3
Heating was performed at 0 mm.
【００２０】その結果、中央部はキュリー点以上に加熱
でき、板幅方向の温度偏差も実用上の目標である＋−３
０℃程度となっており、板幅方向に均一な温度分布が実
現できた。第１の実施形態における板幅方向温度分布を
示す図５と比較して、エッジ部における過加熱現象がな
くなっていることがわかる。As a result, the central portion can be heated above the Curie point, and the temperature deviation in the plate width direction is also a practical target + -3.
It was about 0 ° C, and a uniform temperature distribution was realized in the plate width direction. As compared with FIG. 5 showing the temperature distribution in the plate width direction in the first embodiment, it can be seen that the overheating phenomenon at the edge portion has disappeared.
【００２１】[0021]
【発明の効果】本発明によれば、鋼帯をキュリー点以上
に加熱でき、非磁性体でも加熱でき、しかも、板幅方向
の均温性に優れた金属帯板の加熱装置を提供することが
でき、産業上有用な著しい効果を奏する。According to the present invention, it is possible to provide a heating device for a metal strip that can heat a steel strip to a temperature not lower than the Curie point, can heat a non-magnetic material, and is excellent in temperature uniformity in the strip width direction. It is possible to achieve remarkable effects that are useful in industry.
【図１】 先願の金属帯板の加熱装置を示す断面図であ
る。FIG. 1 is a sectional view showing a heating device for a metal strip of the prior application.
【図２】 先願の金属帯板の加熱装置を用いて加熱した
場合の板幅方向の温度分布を示す図である。FIG. 2 is a diagram showing a temperature distribution in a plate width direction when the metal strip heating device of the prior application is used for heating.
【図３】 本発明の金属帯板の加熱装置における第１の
実施形態を示す図である。FIG. 3 is a diagram showing a first embodiment of a heating apparatus for heating a metal strip according to the present invention.
【図４】 本発明の金属帯板の加熱装置における第１の
実施形態の鋼帯の長手方向の断面図である。FIG. 4 is a longitudinal sectional view of the steel strip of the first embodiment in the metal strip heating apparatus of the present invention.
【図５】 本発明の金属帯板の加熱装置における第１の
実施形態を用いて加熱した場合の板幅方向の温度分布を
示す図である。FIG. 5 is a diagram showing a temperature distribution in the plate width direction when heating is performed using the first embodiment of the heating apparatus for a metal strip according to the present invention.
【図６】 本発明の金属帯板の加熱装置における第２の
実施形態を示す図である。FIG. 6 is a diagram showing a second embodiment of the heating apparatus for metal strips of the present invention.
【図７】 本発明の金属帯板の加熱装置における第２の
実施形態を示す図である。FIG. 7 is a diagram showing a second embodiment of the heating apparatus for metal strips of the present invention.
【図８】 本発明の金属帯板の加熱装置における第２の
実施形態を示す図である。FIG. 8 is a diagram showing a second embodiment of the heating apparatus for metal strips of the present invention.
【図９】 本発明の金属帯板の加熱装置における第２の
実施形態の鋼帯の長手方向の断面図である。FIG. 9 is a longitudinal sectional view of a steel strip according to a second embodiment of the heating apparatus for a metal strip according to the present invention.
【図１０】 本発明の金属帯板の加熱装置における第２
の実施形態を用いて加熱した場合の板幅方向の温度分布
を示す図である。FIG. 10 is a second view of the heating device for a metal strip according to the present invention.
It is a figure which shows the temperature distribution of the board width direction at the time of heating using the embodiment of FIG.
１：金属帯板 ２：シングルターン誘導加熱コイル（帯板の上面） ３：シングルターン誘導加熱コイル（帯板の下面） ４：磁場拡散防止コイル（帯板の上面） ５：磁場拡散防止コイル（帯板の下面） ６：ソレノイド方式誘導加熱コイル ７：エッジ部過加熱防止コイル（帯板の上面） ８：エッジ部過加熱防止コイル（帯板の下面） ９：フェライトコア 1: Metal strip 2: Single-turn induction heating coil (top of strip) 3: Single-turn induction heating coil (bottom surface of strip) 4: Magnetic field diffusion prevention coil (upper surface of strip) 5: Magnetic field diffusion prevention coil (lower surface of strip) 6: Solenoid induction heating coil 7: Edge part overheating prevention coil (upper surface of strip) 8: Edge overheating prevention coil (lower surface of strip) 9: Ferrite core
───────────────────────────────────────────────────── フロントページの続き (72)発明者 朝日山 亮 姫路市広畑区富士町１番地 新日本製鐵株 式会社広畑製鐵所内 (72)発明者 野村 育世 姫路市広畑区富士町１番地 新日本製鐵株 式会社広畑製鐵所内 Ｆターム(参考） 3K059 AA08 AB26 AB28 AD03 AD05 AD07 CD72 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Ryo Asahiyama 1st Fujimachi, Hirohata-ku, Himeji City Nippon Steel Corporation Inside the Hirohata Works (72) Inventor Ikuyo Nomura 1st Fujimachi, Hirohata-ku, Himeji City Nippon Steel Corporation Inside the Hirohata Works F term (reference) 3K059 AA08 AB26 AB28 AD03 AD05 AD07 CD72
Claims (3)
は接触方式の通電加熱ロールと、シングルターン誘導加
熱コイルと、該シングルターン誘導加熱コイルの電流と
逆方向に電流を流すことにより磁場の拡散を防止する磁
場拡散防止コイルとを設けた金属帯板の加熱装置であっ
て、該金属帯板の上面のシングルターン誘導加熱コイル
および磁場拡散防止コイルと、該金属帯板の下面のシン
グルターン誘導加熱コイルおよび磁場拡散防止コイルと
を該金属帯板の長手方向に互いにシフトした位置に配置
することを特徴とする板幅方向の均温性に優れた金属帯
板の加熱装置。1. A solenoid type induction heating coil or a contact type electric heating roll, a single-turn induction heating coil, and a current flowing in a direction opposite to the current of the single-turn induction heating coil prevent diffusion of a magnetic field. A heating device for a metal strip provided with a magnetic field diffusion prevention coil, comprising a single-turn induction heating coil and a magnetic field diffusion prevention coil on the upper surface of the metal strip, and a single-turn induction heating coil on the lower surface of the metal strip. A heating device for a metal strip excellent in temperature uniformity in the strip width direction, wherein a magnetic field diffusion prevention coil is arranged at positions shifted from each other in the longitudinal direction of the strip.
イルに、該シングルターン誘導加熱コイルの電流と同方
向に電流を流すことにより前記金属帯板のエッジ部の渦
電流を分流して該エッジ部の過加熱を防止するエッジ部
過加熱防止コイルを設けることを特徴とする請求項１に
記載の板幅方向の均温性に優れた金属帯板の加熱装置。2. The single-turn induction heating coil is further supplied with a current in the same direction as the current of the single-turn induction heating coil to shunt the eddy current at the edge portion of the metal strip to separate the edge portion. The heating device for a metal strip according to claim 1, wherein an edge portion overheating prevention coil for preventing overheating is provided.
止コイルと、該金属帯板の下面のエッジ部過加熱防止コ
イルとを該金属帯板の長手方向に互いにシフトした位置
に配置することを特徴とする請求項２に記載の板幅方向
の均温性に優れた金属帯板の加熱装置。3. The edge overheating prevention coil on the upper surface of the metal strip and the edge overheating prevention coil on the lower surface of the metal strip are arranged at positions shifted from each other in the longitudinal direction of the metal strip. The heating device for a metal strip according to claim 2, which is excellent in temperature uniformity in the plate width direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001381660A JP3869711B2 (en) | 2001-12-14 | 2001-12-14 | Metal strip heating device with excellent temperature uniformity in the plate width direction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001381660A JP3869711B2 (en) | 2001-12-14 | 2001-12-14 | Metal strip heating device with excellent temperature uniformity in the plate width direction |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003187951A true JP2003187951A (en) | 2003-07-04 |
| JP3869711B2 JP3869711B2 (en) | 2007-01-17 |
Family
ID=27592267
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001381660A Expired - Fee Related JP3869711B2 (en) | 2001-12-14 | 2001-12-14 | Metal strip heating device with excellent temperature uniformity in the plate width direction |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005281778A (en) * | 2004-03-30 | 2005-10-13 | High Frequency Heattreat Co Ltd | Induction heating apparatus and induction heating method |
| JP2006068788A (en) * | 2004-09-03 | 2006-03-16 | Nippon Steel Corp | Method for heating steel belt excellent in uniform heating performance in width direction |
| JP2007324009A (en) * | 2006-06-02 | 2007-12-13 | Nippon Steel Corp | Heating arrangement of metal strip excellent in uniformity of temperature in strip width direction |
| JP2010170951A (en) * | 2009-01-26 | 2010-08-05 | Oet:Kk | Method and device for heating strip-shaped metal plate |
| CN103649346A (en) * | 2011-07-28 | 2014-03-19 | 杰富意钢铁株式会社 | Method for heating steel plate, and heating apparatus |
| JP7116478B2 (en) | 2018-08-10 | 2022-08-10 | 学校法人金沢工業大学 | heating device |
-
2001
- 2001-12-14 JP JP2001381660A patent/JP3869711B2/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005281778A (en) * | 2004-03-30 | 2005-10-13 | High Frequency Heattreat Co Ltd | Induction heating apparatus and induction heating method |
| JP2006068788A (en) * | 2004-09-03 | 2006-03-16 | Nippon Steel Corp | Method for heating steel belt excellent in uniform heating performance in width direction |
| JP2007324009A (en) * | 2006-06-02 | 2007-12-13 | Nippon Steel Corp | Heating arrangement of metal strip excellent in uniformity of temperature in strip width direction |
| JP2010170951A (en) * | 2009-01-26 | 2010-08-05 | Oet:Kk | Method and device for heating strip-shaped metal plate |
| CN103649346A (en) * | 2011-07-28 | 2014-03-19 | 杰富意钢铁株式会社 | Method for heating steel plate, and heating apparatus |
| CN103649346B (en) * | 2011-07-28 | 2016-08-17 | 杰富意钢铁株式会社 | The heating means of steel plate and heater |
| US10455648B2 (en) | 2011-07-28 | 2019-10-22 | Jfe Steel Corporation | Method and apparatus for heating steel sheet |
| JP7116478B2 (en) | 2018-08-10 | 2022-08-10 | 学校法人金沢工業大学 | heating device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3869711B2 (en) | 2007-01-17 |
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