JP2964351B2 - Induction heating method for sheet metal - Google Patents
Induction heating method for sheet metalInfo
- Publication number
- JP2964351B2 JP2964351B2 JP27095090A JP27095090A JP2964351B2 JP 2964351 B2 JP2964351 B2 JP 2964351B2 JP 27095090 A JP27095090 A JP 27095090A JP 27095090 A JP27095090 A JP 27095090A JP 2964351 B2 JP2964351 B2 JP 2964351B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- coil
- transformation point
- solenoid coil
- width direction
- 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.)
- Expired - Lifetime
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Description
【発明の詳細な説明】 ［発明の目的］ （産業上の利用分野） 本発明は金属薄板を磁気変態点以上の温度まで均熱加
熱する誘導加熱方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to an induction heating method for soaking a thin metal sheet to a temperature not lower than the magnetic transformation point.
（従来の技術） 金属薄板の加熱装置としては従来、ガス炉、重油炉、
抵抗式電気炉が主体であった。(Prior art) As a heating device for a thin metal plate, a gas furnace, a heavy oil furnace,
A resistance type electric furnace was mainly used.
一方、近年は金属薄板の焼鈍や、塗装した金属薄板の
表面塗料の乾燥などを行うために、連続的に金属薄板を
加熱する方法としてソレノイドコイル方式の誘導加熱が
行われており、これは主に磁性体の鋼板の加熱に用いら
れている。On the other hand, in recent years, induction heating of a solenoid coil method has been performed as a method of continuously heating a metal sheet in order to anneal the sheet metal and dry a surface paint of the painted sheet metal. It is used for heating magnetic steel plates.
これは第７図および第８図に示すように、水冷コイル
を螺旋状に巻回したソレノイドコイル１の内側に、金属
薄板２を連続的に走行させ、ソレノイドコイル１から発
生する磁束３が金属薄板２と平行な磁束３により誘導加
熱する方法である。As shown in FIGS. 7 and 8, a thin metal plate 2 is continuously run inside a solenoid coil 1 in which a water-cooled coil is spirally wound, and a magnetic flux 3 generated from the solenoid coil 1 This is a method in which induction heating is performed by a magnetic flux 3 parallel to the thin plate 2.
このソレノイドコイル１による誘導加熱は、第９図に
示すように常温から約700℃の磁気変態点までの加熱は
板幅方向にほぼ均一に効率よく加熱することができる。In the induction heating by the solenoid coil 1, as shown in FIG. 9, heating from a room temperature to a magnetic transformation point of about 700 ° C. can be performed almost uniformly and efficiently in the sheet width direction.
しかし磁気変態点以上に加熱する場合には、500MHZ〜
1MHZ程度の高周波電源を必要とし、この装置が高価とな
る上、商用周波数電源から高周波電源への変換効率が低
く不経済である。However, when heated above the magnetic transformation point, 500 mH Z ~
Requires a high-frequency power source of about 1 MH Z, on the device is expensive, the conversion efficiency from the commercial frequency power supply to the high-frequency power is uneconomical low.
またアルミニウム板などの非磁性材料の薄板の加熱方
法としては従来第10図および第11図に示すように、コ字
形鉄心４の凹溝５に水冷コイル６を巻回したインダクタ
７、７を対抗して配置し、この間に金属薄板２を走行さ
せて両インダクタ７、７により上下方向に発生する磁束
３を金属薄板２に垂直に貫通させるトランスバースコイ
ル８による誘導加熱方法が用いられている。As a heating method of a thin plate of a non-magnetic material such as an aluminum plate, as shown in FIGS. 10 and 11, inductors 7 and 7 in which a water-cooled coil 6 is wound around a concave groove 5 of a U-shaped iron core 4 are conventionally used. An induction heating method using a transverse coil 8 in which a magnetic flux 3 generated in the vertical direction by both inductors 7 and 7 is vertically penetrated through the metal thin plate 2 by running the metal thin plate 2 during this time is used.
このトランスバースコイル８による加熱方法は、鋼板
の場合でも常温から1000℃程度までは加熱が可能である
が、板幅方向の温度分布が第12図に示すように大きく不
均一になる欠点があった。This heating method using the transverse coil 8 can heat a steel sheet from room temperature to about 1000 ° C., but has a drawback that the temperature distribution in the sheet width direction becomes largely non-uniform as shown in FIG. Was.
このため、常温から磁気変態点まではソレノイドコイ
ル１で加熱し、磁気変態点に達したら直ちにトランスバ
ースコイル８で加熱する方法も考えられる。For this reason, a method in which heating is performed by the solenoid coil 1 from room temperature to the magnetic transformation point and heating is performed by the transverse coil 8 immediately after reaching the magnetic transformation point is considered.
しかしながらこの方法では第13図に示すように、磁気
変態点に達した時点で曲線ａに示すように両端側が不均
一となり、この不均一な部分がその後のトランスバース
コイル８による加熱で更に拡大され、出口側では曲線ｂ
に示すように極端に不均一となる問題があった。However, in this method, as shown in FIG. 13, when the magnetic transformation point is reached, both ends become non-uniform as shown by a curve a, and this non-uniform part is further enlarged by the subsequent heating by the transverse coil 8. On the exit side, curve b
As shown in FIG.
（発明が解決しようとする問題点） 本発明は上記欠点を除去し、安価な装置により磁気変
態点以上の温度まで均熱加熱することができる金属薄板
の誘導加熱方法を提供することを目的とするものであ
る。(Problems to be Solved by the Invention) An object of the present invention is to provide an induction heating method for a thin metal plate which can eliminate the above-mentioned disadvantages and can be uniformly heated to a temperature not lower than the magnetic transformation point by an inexpensive apparatus. Is what you do.
［発明の構成］ （問題点を解決するための手段） 本発明は、連続走行する金属薄板をトランスバースコ
イルまたはソレノイドコイルで磁気変態点まで加熱し、
次いで磁気変態点でソレノイドコイルにより加熱して板
幅方向に均熱化した後、トランスバースコイルで磁気変
態点以上に加熱することを特徴とするものである。[Constitution of the Invention] (Means for Solving the Problems) The present invention heats a continuously running thin metal plate to a magnetic transformation point with a transverse coil or a solenoid coil,
Then, after heating by a solenoid coil at the magnetic transformation point to equalize the temperature in the sheet width direction, heating is performed by a transverse coil to a temperature higher than the magnetic transformation point.
（作用） 次に本発明方法の作用について説明する。(Operation) Next, the operation of the method of the present invention will be described.
金属薄板を搬送ローラで連続的に搬送し、先ずトラン
スバースコイルまたはソレノイドコイルで常温から磁気
変態点まで加熱する。The metal sheet is continuously conveyed by a conveying roller, and first heated from a room temperature to a magnetic transformation point by a transverse coil or a solenoid coil.
このとき磁気変態点近くでの板幅方向の温度分布は両
端側が少し不均一となる。At this time, the temperature distribution in the plate width direction near the magnetic transformation point is slightly nonuniform at both ends.
この後、ソレノイドコイルで誘導加熱して金属薄板を
磁気変態点温度に保持させると、ソレノイドコイルを通
過する時点では板幅方向の温度分布が均一になる。Thereafter, when the thin metal sheet is maintained at the magnetic transformation temperature by induction heating with a solenoid coil, the temperature distribution in the sheet width direction becomes uniform at the time of passing through the solenoid coil.
この後、トランスバースコイルで900〜1000℃に加熱
すると出口側で板幅方向の温度分布は両端側までほぼ均
一に加熱することができる。Thereafter, when heating is performed to 900 to 1000 ° C. by the transverse coil, the temperature distribution in the sheet width direction at the outlet side can be substantially uniformly heated to both end sides.
このように、金属薄板が磁気変態点に達したら、その
まま温度を上昇させずにソレノイドコイルで磁気変態点
温度に保持して板幅方向の温度分布を均一にしてから、
温度を上昇させることが重要なポイントである。In this way, when the thin metal plate reaches the magnetic transformation point, the temperature is kept at the magnetic transformation point temperature with the solenoid coil without increasing the temperature, and the temperature distribution in the sheet width direction is made uniform,
It is important to raise the temperature.
（実施例） 以下、本発明を図面に示す実施例を参照して詳細に説
明する。Hereinafter, the present invention will be described in detail with reference to examples shown in the drawings.
第１図は本発明の一実施例を示すもので、２台のトラ
ンスバースコイル８、８とソレノイドコイル１と、更に
２台のトランスバースコイル８、８を一連に配置したも
のである。FIG. 1 shows an embodiment of the present invention, in which two transverse coils 8, 8 and a solenoid coil 1 and two further transverse coils 8, 8 are arranged in series.
金属薄板２は搬送ローラ９、９で連続的に搬送し、先
ず前段のトランスバースコイル８、８で常温から磁気変
態点まで加熱する。The metal sheet 2 is continuously conveyed by conveying rollers 9, 9, and first heated by the preceding transverse coils 8, 8 from room temperature to a magnetic transformation point.
この時、Ａ点での板幅方向の温度分布は、第３図に曲
線Ａで示すように両端側が少し不均一になっているが、
２段目のトランスバースコイル８を通過する磁気変態点
近くのＢ点での板幅方向の温度分布は、第３図に曲線Ｂ
で示すように両端側が大きく不均一となる。At this time, the temperature distribution in the sheet width direction at the point A is slightly non-uniform at both ends as shown by the curve A in FIG.
The temperature distribution in the sheet width direction at point B near the magnetic transformation point passing through the second-stage transverse coil 8 is represented by a curve B in FIG.
As shown by, both ends are largely non-uniform.
この後、ソレノイドコイル１で誘導加熱されると、金
属薄板２は磁気変態点温度に達し、この温度に保持させ
るとソレノイドコイル１を通過するＣ点では、板幅方向
の温度分布が第３図に直線Ｃで示すように均一となる。Thereafter, when induction heating is performed by the solenoid coil 1, the metal sheet 2 reaches the magnetic transformation point temperature. When the temperature is maintained at this temperature, the temperature distribution in the sheet width direction at the point C passing through the solenoid coil 1 is shown in FIG. , Becomes uniform as shown by the straight line C.
この後、後段のトランスバースコイル８、８で900〜1
000℃の最終温度に加熱すると出口のＤ点での板幅方向
の温度分布は、第３図に曲線Ｄで示すように両端側まで
ほぼ均一となる。After this, 900-1
When heated to the final temperature of 000 ° C., the temperature distribution in the sheet width direction at point D at the outlet becomes almost uniform to both ends as shown by the curve D in FIG.
従って磁気変態点以下の磁性領域と、磁気変態点を越
える非磁性領域の加熱はトランスバースコイル８を用い
るので、電源の周波数が低くなり装置価格を低減させる
ことができる。Therefore, since the transverse coil 8 is used to heat the magnetic region below the magnetic transformation point and the non-magnetic region beyond the magnetic transformation point, the frequency of the power supply is reduced, and the cost of the apparatus can be reduced.
第４図は本発明の他の実施例を示すもので、コイルの
巻きピッチが狭い前段のソレノイドコイル１と、コイル
の巻きピッチが広い後段のソレノイドコイル１と、３台
のトランスバースコイル８…とを一連に配置したもので
ある。FIG. 4 shows another embodiment of the present invention. The former solenoid coil 1 has a narrow winding pitch of the coil, the latter solenoid coil 1 has a wide winding pitch of the coil, and three transverse coils 8. Are arranged in series.
金属薄板２は搬送ローラ９、９で連続的に搬送し、先
ず前段のソレノイドコイル１で常温から磁気変態点まで
加熱する。The metal sheet 2 is continuously conveyed by the conveying rollers 9, and is first heated from the room temperature to the magnetic transformation point by the former solenoid coil 1.
この時、Ａ点での板幅方向の温度分布は、第６図に曲
線Ａで示すようにほぼ均一になっており、更に磁気変態
点近くの出口側のＢ点での板幅方向の温度分布は、第６
図に曲線Ｂで示すように両端側が少し温度が高くなる。At this time, the temperature distribution in the sheet width direction at the point A is almost uniform as shown by the curve A in FIG. 6, and the temperature distribution in the sheet width direction at the point B on the exit side near the magnetic transformation point is further improved. The distribution is the sixth
As shown by the curve B in the figure, the temperature slightly increases at both ends.
この後、後段のソレノイドコイル１で誘導加熱される
と、金属薄板２は磁気変態点温度に達し、この温度に保
持させると端部側の放熱が多くなり、ソレノイドコイル
１を通過するＣ点では、板幅方向の温度分布が第６図に
直線Ｃで示すように均一となる。Thereafter, when the induction heating is performed by the solenoid coil 1 at the subsequent stage, the metal sheet 2 reaches the magnetic transformation point temperature, and when the temperature is maintained at this temperature, the heat radiation on the end side increases, and at the point C passing through the solenoid coil 1 The temperature distribution in the plate width direction becomes uniform as shown by the straight line C in FIG.
この後、トランスバースコイル８…で温度を900〜100
0℃に加熱すると出口側のＤ点での板幅方向の温度分布
は、第６図に曲線Ｄで示すように両端側は少し低下して
いるが全体としてほぼ均一の温度になる。After that, the temperature is adjusted to 900 to 100 by the transverse coil 8.
When heated to 0 ° C., the temperature distribution in the sheet width direction at the point D on the outlet side slightly decreases at both ends as shown by a curve D in FIG. 6, but becomes substantially uniform as a whole.
この装置では磁気変態点を越える非磁性領域の加熱を
トランスバースコイル８を用ているので電源の周波数が
低くなり装置価格を低減させることができる。In this device, since the transverse coil 8 is used to heat the non-magnetic region exceeding the magnetic transformation point, the frequency of the power supply is reduced, and the cost of the device can be reduced.
なお上記実施例では、ソレノイドコイル１、１を２段
に分離して設けた構造について示したが、１本のソレノ
イドコイル１の巻きピッチを前側を広くし、後側を狭く
してここで磁気変態点での均熱加熱を行うようにしても
良い。In the above-described embodiment, the structure in which the solenoid coils 1 and 1 are provided in two stages is shown. However, the winding pitch of one solenoid coil 1 is widened on the front side and narrowed on the rear side. You may make it carry out soaking heating at a transformation point.
また上記実施例では、ソレノイドコイル１とトランス
バースコイル８を横一連に配置した場合について説明し
たが、縦方向に配置して金属薄板２を上下方向に蛇行さ
せながら加熱しても良い。Further, in the above embodiment, the case where the solenoid coil 1 and the transverse coil 8 are arranged in a horizontal series has been described. However, the solenoid coil 1 and the transverse coil 8 may be arranged in the vertical direction to heat the metal sheet 2 while meandering in the vertical direction.
［発明の効果］ 以上説明した如く本発明によれば、磁気変態点まで加
熱された金属薄板をソレノイドコイルで加熱してこの温
度に保持させることにより、板幅方向の温度分布を均一
にしてから、磁気変態点を越える非磁性領域の加熱を安
価なトランスバースコイルで行うので、安価な装置によ
り磁気変態点以上の温度まで均一に加熱できる金属薄板
の誘導加熱方法を得ることができる。[Effects of the Invention] As described above, according to the present invention, the temperature distribution in the sheet width direction is made uniform by heating the thin metal sheet heated to the magnetic transformation point with the solenoid coil and maintaining the temperature. Since the non-magnetic region beyond the magnetic transformation point is heated by an inexpensive transverse coil, an inexpensive apparatus can be used to obtain an induction heating method for a metal sheet that can be uniformly heated to a temperature above the magnetic transformation point.
第１図は本発明の一実施例による誘導加熱装置の構成を
示す説明図、第２図は第１図の装置による金属薄板の温
度変化を示すグラフ、第３図は金属薄板の板幅方向の温
度分布を示すグラフ、第４図は本発明の他の実施例によ
る誘導加熱装置の構成を示す説明図、第５図は第４図の
装置による金属薄板の温度変化を示すグラフ、第６図は
金属薄板の板幅方向の温度分布を示すグラフ、第７図は
ソレノイドコイルを示す正面断面図、第８図は第７図の
側面図、第９図は金属薄板の板幅方向の温度分布を示す
グラフ、第10図はトランスバースコイルを示す正面図、
第11図は第10図の側面図、第12図および第13図は金属薄
板の板幅方向の温度分布を示すグラフである。 １……ソレノイドコイル、２……金属薄板 ３……磁束、４……コ字形鉄心 ５……凹溝、６……水冷コイル ７……インダクタ、８……トランスバースコイル ９……搬送ローラFIG. 1 is an explanatory view showing a configuration of an induction heating apparatus according to an embodiment of the present invention, FIG. 2 is a graph showing a temperature change of a metal sheet by the apparatus of FIG. 1, and FIG. 3 is a sheet width direction of the metal sheet. FIG. 4 is an explanatory diagram showing a configuration of an induction heating device according to another embodiment of the present invention, FIG. 5 is a graph showing a temperature change of a thin metal plate by the device of FIG. 4, and FIG. FIG. 7 is a graph showing the temperature distribution of the metal sheet in the sheet width direction, FIG. 7 is a front sectional view showing the solenoid coil, FIG. 8 is a side view of FIG. 7, and FIG. Graph showing distribution, FIG. 10 is a front view showing a transverse coil,
FIG. 11 is a side view of FIG. 10, and FIGS. 12 and 13 are graphs showing the temperature distribution in the sheet width direction of a thin metal plate. DESCRIPTION OF SYMBOLS 1 ... Solenoid coil, 2 ... Metal thin plate 3 ... Magnetic flux, 4 ... U-shaped iron core 5 ... Concave groove, 6 ... Water cooling coil 7 ... Inductor, 8 ... Transverse coil 9 ... Conveying roller
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭54−154848（ＪＰ，Ａ) 特開 平２−250285（ＪＰ，Ａ) 実開 昭63−91195（ＪＰ，Ｕ) 実公 昭51−25805（ＪＰ，Ｙ１) (58)調査した分野(Int.Cl.6，ＤＢ名) H05B 6/10 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-54-154848 (JP, A) JP-A-2-250285 (JP, A) JP-A 63-91195 (JP, U) JP-A 51- 25805 (JP, Y1) (58) Field surveyed (Int. Cl. 6 , DB name) H05B 6/10
Claims (1)
イルまたはソレノイドコイルで磁気変態点まで加熱し、
次いで磁気変態点でソレノイドコイルにより加熱して板
幅方向に均熱化した後、トランスバースコイルで磁気変
態点以上に加熱することを特徴とする金属薄板の誘導加
熱方法。1. A continuously running thin metal sheet is heated to a magnetic transformation point by a transverse coil or a solenoid coil.
A method for inductively heating a thin metal sheet, comprising: heating at a magnetic transformation point by a solenoid coil to equalize the temperature in the sheet width direction;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27095090A JP2964351B2 (en) | 1990-10-09 | 1990-10-09 | Induction heating method for sheet metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27095090A JP2964351B2 (en) | 1990-10-09 | 1990-10-09 | Induction heating method for sheet metal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04147596A JPH04147596A (en) | 1992-05-21 |
| JP2964351B2 true JP2964351B2 (en) | 1999-10-18 |
Family
ID=17493277
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27095090A Expired - Lifetime JP2964351B2 (en) | 1990-10-09 | 1990-10-09 | Induction heating method for sheet metal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2964351B2 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4965031B2 (en) * | 2001-06-15 | 2012-07-04 | 大豊工業株式会社 | Temperature control method in high frequency heating |
| JP4035122B2 (en) * | 2004-09-03 | 2008-01-16 | 新日本製鐵株式会社 | Steel strip heating method with excellent temperature uniformity in the width direction |
| TWI326713B (en) | 2005-02-18 | 2010-07-01 | Nippon Steel Corp | Induction heating device for heating a traveling metal plate |
| JP4786365B2 (en) * | 2005-02-18 | 2011-10-05 | 新日本製鐵株式会社 | Induction heating apparatus and induction heating method for metal plate |
| US9888529B2 (en) | 2005-02-18 | 2018-02-06 | Nippon Steel & Sumitomo Metal Corporation | Induction heating device for a metal plate |
| JP5342921B2 (en) * | 2009-04-28 | 2013-11-13 | 新日鉄住金エンジニアリング株式会社 | Metal plate induction heating device |
| WO2013010968A1 (en) * | 2011-07-15 | 2013-01-24 | Tata Steel Ijmuiden Bv | Apparatus for producing annealed steels and process for producing said steels |
| KR101983388B1 (en) | 2012-02-14 | 2019-05-28 | 토쿠덴 가부시기가이샤 | Induction heating apparatus |
| US9474109B2 (en) | 2012-08-13 | 2016-10-18 | Tokuden Co., Ltd. | Induction heating apparatus |
| JP6296242B2 (en) * | 2014-11-25 | 2018-03-20 | Ｊｆｅスチール株式会社 | Heating method and continuous annealing equipment for thin steel sheet |
| CN105698525B (en) * | 2014-11-27 | 2019-07-23 | 宝山钢铁股份有限公司 | Induction heater with point half formula plate induction coil |
-
1990
- 1990-10-09 JP JP27095090A patent/JP2964351B2/en not_active Expired - Lifetime
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| Publication number | Publication date |
|---|---|
| JPH04147596A (en) | 1992-05-21 |
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