JPH0557404A - Continuously casting device for steel sheet - Google Patents

Continuously casting device for steel sheet

Info

Publication number
JPH0557404A
JPH0557404A JP22605991A JP22605991A JPH0557404A JP H0557404 A JPH0557404 A JP H0557404A JP 22605991 A JP22605991 A JP 22605991A JP 22605991 A JP22605991 A JP 22605991A JP H0557404 A JPH0557404 A JP H0557404A
Authority
JP
Japan
Prior art keywords
magnetic field
weir
plate
frequency coil
vicinity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP22605991A
Other languages
Japanese (ja)
Inventor
Toshio Sato
俊雄 佐藤
Akira Yada
明 矢田
Shunichi Sugiyama
峻一 杉山
Masayuki Nakada
正之 中田
Takashi Osako
隆志 大迫
Kentaro Mori
健太郎 森
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE 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 JP22605991A priority Critical patent/JPH0557404A/en
Publication of JPH0557404A publication Critical patent/JPH0557404A/en
Pending legal-status Critical Current

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  • Continuous Casting (AREA)

Abstract

PURPOSE:To obtain a steel sheet excellent in surface property with a casting device providing on high frequency induction coil with large capacity. CONSTITUTION:In the twin roll type continuous casting device for steel sheet, the high frequency coils are provided on the outside of the weirs 3, 4 along the vicinity of the triple point part in contact with the cooling rolls 1a, 1b, the weirs 3, 4 and a molten steel, and also magnetic field amplifying plates 9a, 9b are disposed while approaching to the high frequency induction coils, and in these magnetic field amplifying plates 9a, 9b, parts, such as groove, gap for preventing the conduction of energizing of induction current are provided in a stripe-state toward the outside from the weir side. Thus, since the induction current flow is prevented with the parts such as groove, gap, and the current flows in surroundings of the magnetic field amplifying plates 9a, 9b at high density, strong magnetic pressure is concentrically impressed in the surroundings of the weir sides (in the vicinity of the triple point part) to form space there, and the solidification of the molten steel is not occurred in vicinity of the triple point part.

Description

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

【0001】[0001]

【産業上の利用分野】本発明は、鋼板の連続鋳造装置に
関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel plate continuous casting apparatus.

【0002】[0002]

【従来の技術】溶鋼から鋼板を直接且つ連続的に鋳造す
る装置としては、例えば、特開昭63−80945号公
報に提案された技術がある。図9(a),(b)は上記
従来術を示し、(a)図は部分切欠き正面図、(b)図
は要部の斜視図である。この装置は、所謂、双ロ−ル式
連続鋳造装置であって、互いに平行で且つ水平に近接配
置された一対の冷却ロ−ル1a,1bと、この2基の冷
却ロ−ル1a,1bによって形成された谷状空間に溶鋼
2を溜めるための端部堰3,3及び頂部堰4,4によっ
て要部が構成されている。端部堰3及び頂部堰4は、冷
却ロ−ル1a,1bとの間に僅かな間隙を設けて配置さ
れており、冷却ロ−ル1a,1bは図示されない駆動手
段によって駆動され、対向する外周面がそれぞれ下降す
る方向に回転するようになっている。
2. Description of the Related Art As an apparatus for directly and continuously casting a steel sheet from molten steel, for example, there is a technique proposed in Japanese Patent Laid-Open No. 63-80945. 9 (a) and 9 (b) show the above-mentioned conventional technique, FIG. 9 (a) is a partially cutaway front view, and FIG. 9 (b) is a perspective view of a main part. This apparatus is a so-called twin-roll type continuous casting apparatus, and includes a pair of cooling rolls 1a and 1b arranged in parallel and horizontally adjacent to each other and two cooling rolls 1a and 1b. The main parts are constituted by the end dams 3 and 3 and the top dams 4 and 4 for accumulating the molten steel 2 in the valley-shaped space formed by. The end weir 3 and the top weir 4 are arranged with a slight gap between them and the cooling rolls 1a and 1b, and the cooling rolls 1a and 1b are driven by a driving means (not shown) and face each other. The outer peripheral surface is adapted to rotate in the descending direction.

【0003】そして、冷却ロ−ル1a,1bの外周面に
沿う端部堰3の近接部及び端部堰3の下部には、高周波
コイル5が埋設されている。
A high frequency coil 5 is embedded in the vicinity of the end dam 3 along the outer peripheral surfaces of the cooling rolls 1a and 1b and in the lower part of the end dam 3.

【0004】このように構成された装置において、冷却
ロ−ル1a,1bを起動し、高周波コイル5に通電した
後、堰で囲われた冷却ロ−ル1a,1b上の谷状空間に
溶鋼2を供給すると、冷却ロ−ル1a,1bの外周面に
溶鋼2が凝固し、凝固シェル6,6が生成する。凝固シ
ェル6,6は冷却ロ−ル1a,1bの回転に伴って順次
下方に移動し、冷却ロ−ル1a,1bの近接部において
圧着されて1枚の鋼板7となる。この鋼板7は連続的に
送り出され、巻取機(図示せず)によって巻き取られ
る。
In the apparatus constructed as described above, the cooling rolls 1a and 1b are started, the high frequency coil 5 is energized, and then molten steel is placed in the valley-shaped space above the cooling rolls 1a and 1b surrounded by the weir. When 2 is supplied, the molten steel 2 is solidified on the outer peripheral surfaces of the cooling rolls 1a and 1b to form solidified shells 6 and 6. The solidification shells 6 and 6 move sequentially downward as the cooling rolls 1a and 1b rotate, and are pressure-bonded in the vicinity of the cooling rolls 1a and 1b to form a single steel plate 7. The steel plate 7 is continuously sent out and wound up by a winder (not shown).

【0005】上記の装置において、高周波コイル5は、
次のような問題を防止するために備えている。
In the above apparatus, the high frequency coil 5 is
It is prepared to prevent the following problems.

【0006】高周波コイル5がないと下記のような問題
が起こる。頂部堰4に生成した凝固シェル8又は端部堰
3に生成した凝固シェルは、次第に成長し、冷却ロ−ル
1a,1bに生成した凝固シェル6と固着し繋がってし
まう。この2つの凝固シェルが繋がると、一方の凝固シ
ェル6が冷却ロ−ル1a,1bの回転に伴って移動する
するので、その固着部は切断される。このような状況が
繰り返されると鋳造された鋼板7の表面や側部に凹凸が
でき、その表面性状は非常に悪くなる。又、冷却ロ−ル
1a,1bと端部堰3及び頂部堰4との間には僅かな間
隙があるが、この間隙に溶鋼2が差し込むと、そこに凝
固シェルが生成し、この凝固シェルも冷却ロ−ル1a,
1bの凝固シェル6と固着して繋がる。そして、上記同
様に鋼板7の表面性状を著しく悪くしたり、ブレークア
ウトを起こしたりする。
Without the high frequency coil 5, the following problems occur. The solidified shell 8 formed on the top weir 4 or the solidified shell formed on the end weir 3 gradually grows and is fixedly connected to the solidified shell 6 formed on the cooling rolls 1a and 1b. When the two solidified shells are connected, one solidified shell 6 moves with the rotation of the cooling rolls 1a and 1b, so that the fixed portion is cut. When such a situation is repeated, unevenness is formed on the surface and side portions of the cast steel plate 7, and the surface quality becomes extremely poor. Also, there is a slight gap between the cooling rolls 1a and 1b and the end weir 3 and the top weir 4, but when the molten steel 2 is inserted into this gap, a solidified shell is generated and this solidified shell is formed. Cooling roll 1a,
The solidified shell 6 of 1b is fixed and connected. Then, similarly to the above, the surface properties of the steel sheet 7 are remarkably deteriorated or breakout occurs.

【0007】このように、冷却ロ−ル1a又は冷却ロ−
ル1b、端部堰3又は頂部堰4、及び溶鋼2の3者が接
する部分(以下、3重点部と言う)に凝固シェルが生成
すると上述のような種々の問題が引き起こされる。
In this way, the cooling roll 1a or the cooling roll
When the solidified shell is generated in the portion (hereinafter, referred to as the triple point portion) where the rule 1b, the end weir 3 or the top weir 4, and the molten steel 2 are in contact with each other, various problems as described above are caused.

【0008】この問題に対処し、上記従来技術では高周
波コイル5を備えている。図10は高周波コイルの作用
に係る説明図である。高周波コイル5に電流が流れる
と、溶鋼中には図中矢印の方向に磁界Hが生じ逆位相の
渦電流が誘起する。これによって、磁気圧力Fが発生
し、3重点部の溶鋼は堰4から離される方向に働く力を
受ける。このため、高周波コイル5に通電する電流の値
を或る値以上にすれば、磁気圧力Fは3重点部における
溶鋼の静圧より大きくなり、3重点部に溶鋼が存在しな
い空間(溶鋼と3重点部が非接触の状態)を作ることが
出来る。
In order to cope with this problem, the above-mentioned prior art is provided with the high frequency coil 5. FIG. 10 is an explanatory diagram related to the operation of the high frequency coil. When a current flows through the high frequency coil 5, a magnetic field H is generated in the molten steel in the direction of the arrow in the figure, and an eddy current having an opposite phase is induced. As a result, a magnetic pressure F is generated, and the molten steel at the triple points receives a force acting in a direction away from the weir 4. For this reason, when the value of the current flowing through the high-frequency coil 5 is set to a certain value or more, the magnetic pressure F becomes larger than the static pressure of the molten steel at the triple point, and the space where molten steel does not exist at the triple point (the molten steel and It is possible to create a state where the important point is non-contact.

【0009】[0009]

【発明が解決しようとする課題】しかし、上記従来の装
置においては、高周波コイルに通電して磁界を発生させ
ても、磁場が拡散してしまうので、その効率は非常に悪
い。このため、表面性状が良好な鋼板を鋳造するために
必要な磁気圧力を発生させるためには、高周波電源の容
量を非常に大きなものにしなければならない。又、熱負
荷が大きい3重点部近傍の堰に大容量の高周波コイルが
埋め込まれていると、誘導電流による熱応力によって、
堰が破損する(割れが生ずる)と言う問題も発生する。
However, in the above-mentioned conventional device, even if a high frequency coil is energized to generate a magnetic field, the magnetic field diffuses, so that the efficiency is very poor. Therefore, in order to generate the magnetic pressure necessary for casting a steel sheet having a good surface quality, the capacity of the high frequency power source must be made extremely large. Also, if a high-capacity high-frequency coil is embedded in the weir near the triple point where the heat load is large, due to the thermal stress due to the induced current,
There is also a problem that the weir breaks (cracks).

【0010】本発明は、大容量の高周波コイルを備える
ことなく、表面性状が良好な鋼板を鋳造することができ
る鋼板の連続鋳造装置を提供することを目的とする。
It is an object of the present invention to provide a steel plate continuous casting apparatus capable of casting a steel plate having a good surface property without providing a high-capacity high frequency coil.

【0011】[0011]

【課題を解決するための手段及び作用】上記の目的を達
成するために、本発明においては、冷却ロ−ルと堰及び
溶鋼が接する3重点部の近傍に沿った堰の外側に誘導電
流を発生させるための高周波コイルを備え、この高周波
コイルに近接して磁場増幅板を配設し、この磁場増幅板
には冷却箱を付設すると共に高周波コイルから発生する
誘導電流の通電を阻止する部分を堰側から外側に向けて
筋状に設けている。
In order to achieve the above object, in the present invention, an induced current is applied to the outside of the weir along the vicinity of the triple point where the cooling roll contacts the weir and the molten steel. It is equipped with a high-frequency coil for generating, and a magnetic field amplification plate is arranged in the vicinity of this high-frequency coil. A cooling box is attached to this magnetic field amplification plate, and a part for blocking conduction of an induction current generated from the high-frequency coil is provided. Striations are provided from the weir side to the outside.

【0012】誘導電流の通電を阻止するために上記磁場
増幅板に設ける筋状の部分の形態としては少なくとも一
条の溝であってもよく、或いは少なくとも一条の間隙
(切れ目)であってもよい。
The streak-like portion provided on the magnetic field amplifying plate for blocking the conduction of the induced current may be at least one groove or at least one gap (break).

【0013】そして、磁場増幅板は、必ずしも単一の部
材で配設する必要はなく、冷却箱の上板を磁場増幅板と
して兼用にすることもできる。即ち、冷却ロ−ルと堰及
び溶鋼が接する3重点部の近傍に沿った堰の外側に誘導
電流を発生させるための高周波コイルを備え、この高周
波コイルに近接して冷却箱を配設し、この冷却箱の上板
に高周波コイルから発生する誘導電流の通電を阻止する
部分を堰側から外側に向けて筋状に設けた構成にしても
よい。
The magnetic field amplification plate does not necessarily have to be provided as a single member, and the upper plate of the cooling box can also be used as the magnetic field amplification plate. That is, a high frequency coil for generating an induced current is provided outside the weir along the vicinity of the triple point where the cooling roll contacts the weir and the molten steel, and the cooling box is arranged in the vicinity of this high frequency coil. The upper plate of the cooling box may be provided with a portion that blocks the passage of the induction current generated from the high frequency coil in a streak shape from the weir side to the outside.

【0014】以下、高周波コイルに近接して配設された
磁場増幅板及び上記冷却箱の上板を一括して磁場増幅板
と言う。
Hereinafter, the magnetic field amplification plate arranged close to the high frequency coil and the upper plate of the cooling box will be collectively referred to as a magnetic field amplification plate.

【0015】磁場増幅板の材質としては、例えば、銅や
アルミニウムのような電気伝導度が大きい金属が適して
いる。
As a material of the magnetic field amplification plate, for example, a metal having a high electric conductivity such as copper or aluminum is suitable.

【0016】金属板の近傍に高周波コイルを配置しこれ
に高周波電流を通電すると、相互誘導作用によって誘導
電流が流れ、そこに磁気圧力が生ずる。そして、本発明
のように、磁場増幅板である金属板に溝や間隙を設けて
あると、この部分が誘導電流の通電を阻止する部分にな
るので、誘導電流は磁場増幅板の周辺を流れる。このた
め、磁場増幅板の堰側周辺(3重点部近傍)には誘導電
流が高密度で流れ、これによって3重点部に対し強い磁
気圧力が集中的に印加されるようになる。
When a high-frequency coil is arranged near the metal plate and a high-frequency current is passed through it, an induced current flows due to the mutual induction action, and a magnetic pressure is generated there. When a metal plate, which is a magnetic field amplification plate, is provided with a groove or a gap as in the present invention, this portion becomes a portion that blocks the conduction of the induction current, so that the induction current flows around the magnetic field amplification plate. .. For this reason, the induced current flows at a high density around the dam side of the magnetic field amplification plate (near the triple point), whereby a strong magnetic pressure is concentratedly applied to the triple point.

【0017】従って、磁場増幅板は3重点部にできるだ
け近い位置に沿った配置にすることが望ましい。
Therefore, it is desirable to arrange the magnetic field amplification plate along a position as close as possible to the triple point.

【0018】磁場増幅板に設ける溝の深さは、次の
(1)式によって求めたδの約2倍以上であるのがよ
い。即ち、磁場は表皮から板厚方向に向かって指数的に
減衰するため、深さが上記値以上の溝を設けてあれば、
誘導電流の流れは大部分が阻止される(通電は実質的に
阻止される)。又、間隙を設けた場合の磁場増幅板の厚
さは、δの約0.3倍以上であるのが望ましい。
The depth of the groove provided in the magnetic field amplification plate is preferably about twice or more of δ obtained by the following equation (1). That is, the magnetic field exponentially attenuates from the skin in the plate thickness direction, so if a groove having a depth of the above value or more is provided,
Most of the flow of induced current is blocked (current is substantially blocked). Further, the thickness of the magnetic field amplifying plate when the gap is provided is preferably about 0.3 times δ or more.

【0019】δ={2/(ωσμ)}1/2 …(1) 但し、ω;高周波電流の角周波数 σ;磁場増幅板の電気伝導度 μ;磁場増幅板の透磁率 本発明の磁場増幅板については、単独で配置され単に冷
却箱と接触しているだけの場合と、冷却箱の上板と兼用
にした構成の場合とがある。しかし、いずれの場合であ
っても、溝の深さや板厚を上記の範囲にしておけばよ
い。
Δ = {2 / (ωσμ)} 1/2 (1) where ω; angular frequency of high frequency current σ; electric conductivity of magnetic field amplification plate μ; magnetic permeability of magnetic field amplification plate Magnetic field amplification of the present invention Regarding the plate, there are a case where it is arranged alone and is simply in contact with the cooling box, and a case where it is also used as an upper plate of the cooling box. However, in any case, the depth and thickness of the groove may be set within the above range.

【0020】まず、単独で配置された磁場増幅板におい
ては、磁場増幅板と冷却箱が接触していても、その間の
電気的な接触抵抗は非常に大きいので、誘導電流の殆ど
は冷却箱を流れることなく、磁場増幅板の中を流れる。
このため、冷却箱の存在は、特に考慮する必要はない。
磁場増幅板の板厚が0.3δより薄くなると、通電抵抗
が増大し、磁場が作用する領域が狭くなるので(磁場の
作用は板の厚さ分及びその周辺だけにしか及ばないの
で)、3重点部に生成させる空間(溶鋼が存在しない空
間)が小さくなり、その必要領域が確保できない。
First, in a magnetic field amplification plate arranged alone, even if the magnetic field amplification plate and the cooling box are in contact with each other, the electrical contact resistance between them is very large, so most of the induced current is in the cooling box. It flows in the magnetic field amplification plate without flowing.
Therefore, it is not necessary to consider the presence of the cooling box.
When the plate thickness of the magnetic field amplification plate is smaller than 0.3δ, the conduction resistance increases and the region in which the magnetic field acts becomes narrower (because the action of the magnetic field extends only to the thickness of the plate and its periphery), The space (space where molten steel does not exist) generated in the triple point becomes small, and the necessary area cannot be secured.

【0021】一方、磁場増幅板が冷却箱の上板と兼用に
なっている場合、磁場増幅板と冷却箱は電気的に導通し
ているため、これに設ける溝の深さは、磁場増幅板から
冷却箱に流れる電流のリークを十分に少なくするように
考慮した寸法にする必要がある。しかし、上述のよう
に、磁場は表皮から板厚方向に向かって指数的に減衰す
るので、溝の深さがδの2倍以上であれば、誘導電流の
大部分の流れを阻止することができる。
On the other hand, when the magnetic field amplifying plate is also used as the upper plate of the cooling box, the magnetic field amplifying plate and the cooling box are electrically connected to each other. It is necessary to consider the dimensions so as to sufficiently reduce the leakage of the current flowing from the cooling box to the cooling box. However, as described above, since the magnetic field exponentially attenuates from the skin in the plate thickness direction, if the depth of the groove is at least twice δ, most of the induced current can be blocked. it can.

【0022】又、本発明においては、磁場増幅板に冷却
箱を付設しているが、これは、高周波コイルに通電する
と、磁場増幅板は誘導電流によって加熱されるので、非
常な高温になってしまい、その連続使用が不可能になっ
てしまうためである。
Further, in the present invention, a cooling box is attached to the magnetic field amplification plate. However, when the high frequency coil is energized, the magnetic field amplification plate is heated by the induced current, so that the temperature becomes extremely high. This is because the continuous use becomes impossible.

【0023】[0023]

【実施例】図1は本発明の一実施例を示し、(a)は正
面図、(b)は側面図、(c)は平面図である。図1に
おいて、図9と同じ部分については同一の符号を付し説
明を省略する。1a,1bは冷却ロ−ル、3は端部堰、
4は頂部堰である。本実施例においては、端部堰3の外
側の3重点部近傍に沿って磁場増幅板9aが配置され、
又、頂部堰4側にも、その3重点部の近傍に沿って磁場
増幅板9bが配置されている。磁場増幅板9a,9bの
上には、端部堰3,3及び頂部堰4,4を囲み、且つ端
部堰3,3及び頂部堰4,4に近接した位置に高周波コ
イル5が備えられている。そして、磁場増幅板9a,9
bの下面には、磁場増幅板9a,9bとそれぞれ密着し
て一体構造になっている冷却箱が取り付けられている。
この冷却箱は、銅製の水冷構造で、端部堰3側の磁場増
幅板9aには冷却箱10が取り付けられ、頂部堰4側の
磁場増幅板9bには冷却箱11が取り付けられており、
磁場増幅板9a,9bは下面から冷却される。上記磁場
増幅板9a,9bは特別の形状をなしており、この形状
については後述する。
FIG. 1 shows an embodiment of the present invention, (a) is a front view, (b) is a side view, and (c) is a plan view. In FIG. 1, the same parts as those in FIG. 9 are designated by the same reference numerals and the description thereof will be omitted. 1a and 1b are cooling rolls, 3 is an end dam,
4 is a top weir. In the present embodiment, the magnetic field amplification plate 9a is arranged along the vicinity of the triple point outside the end dam 3.
A magnetic field amplification plate 9b is also arranged on the top weir 4 side along the vicinity of the triple point. A high frequency coil 5 is provided on the magnetic field amplification plates 9a and 9b so as to surround the end weirs 3 and 3 and the top weirs 4 and 4 and at a position close to the end weirs 3 and 3 and the top weirs 4 and 4. ing. Then, the magnetic field amplification plates 9a, 9
On the lower surface of b, there is attached a cooling box which is in close contact with the magnetic field amplification plates 9a and 9b and has an integral structure.
This cooling box has a water cooling structure made of copper, and the cooling box 10 is attached to the magnetic field amplification plate 9a on the side of the end dam 3 and the cooling box 11 is attached to the magnetic field amplification plate 9b on the side of the top dam 4.
The magnetic field amplification plates 9a and 9b are cooled from the lower surface. The magnetic field amplification plates 9a and 9b have a special shape, which will be described later.

【0024】図2は本発明の他の実施例を示し、(a)
は正面図、(b)は側面図である。図2において、図9
及び図1と同じ部分については同一の符号を付し説明を
省略する。この実施例は端部堰3だけを設けた場合であ
り、端部堰3の外側の3重点部近傍に沿って磁場増幅板
9aが配置されている。磁場増幅板9aの上方には、端
部堰3に近接した位置に高周波コイル5が備えられてい
る。そして、磁場増幅板9aの下面には、磁場増幅板9
aと密着して一体構造になっている冷却箱10が取り付
けられている。上記磁場増幅板9aの形状についても後
述する。
FIG. 2 shows another embodiment of the present invention, (a)
Is a front view and (b) is a side view. In FIG.
The same parts as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. In this embodiment, only the end dam 3 is provided, and the magnetic field amplification plate 9a is arranged along the vicinity of the triple point outside the end dam 3. A high frequency coil 5 is provided above the magnetic field amplification plate 9a and in a position close to the end dam 3. The magnetic field amplification plate 9a is provided on the lower surface of the magnetic field amplification plate 9a.
A cooling box 10 that is in close contact with a and has an integral structure is attached. The shape of the magnetic field amplification plate 9a will also be described later.

【0025】図3は図1の連続鋳造装置における磁場増
幅板の配置及び形状を示す図、図4は図2の連続鋳造装
置における磁場増幅板の配置及び形状を示す図である。
FIG. 3 is a view showing the arrangement and shape of the magnetic field amplification plates in the continuous casting apparatus of FIG. 1, and FIG. 4 is a view showing the arrangement and shape of the magnetic field amplification plates in the continuous casting apparatus of FIG.

【0026】図3において、9aは端部堰側の磁場増幅
板、9bは頂部堰側の磁場増幅板であり、1a,1bは
冷却ロ−ル、3は端部堰、4は頂部堰を示す。磁場増幅
板9a,9bには、内側(堰3,4側)から外側に達す
る溝12が設けられており、2区画に区画されている。
そして、それぞれの区画の中には凹部13が形成されて
いる。又、磁場増幅板9a,9bには、上記凹部13か
ら内側(堰3,4側)に達する溝14が設けられてい
る。
In FIG. 3, 9a is a magnetic field amplification plate on the side of the end weir, 9b is a magnetic field amplification plate on the side of the top weir, 1a and 1b are cooling rolls, 3 is an end weir, and 4 is a top weir. Show. The magnetic field amplification plates 9a and 9b are provided with a groove 12 that extends from the inside (sides of the weirs 3 and 4) to the outside, and is divided into two sections.
And the recessed part 13 is formed in each division. Further, the magnetic field amplification plates 9a and 9b are provided with a groove 14 that extends from the recess 13 to the inside (sides of the dams 3 and 4).

【0027】図4において、9aは端部堰側の磁場増幅
板であり、1a,1bは冷却ロ−ル、3は端部堰を示
す。この磁場増幅板9aは、図3における端部堰側の磁
場増幅板9aと同じであるので、説明を省略する。
In FIG. 4, 9a is a magnetic field amplification plate on the side of the end dam, 1a and 1b are cooling rolls, and 3 is an end dam. This magnetic field amplification plate 9a is the same as the magnetic field amplification plate 9a on the side of the end dam in FIG.

【0028】図5〜図7は磁場増幅板の各種実施例を示
した図である。なお、端部堰側の磁場増幅板と頂部堰側
の磁場増幅板との間には基本的な差異がないので、端部
堰側に配設された磁場増幅板を例に挙げた。各図におい
て、3は端部堰を示す。
5 to 7 are views showing various embodiments of the magnetic field amplifying plate. Since there is no fundamental difference between the magnetic field amplification plate on the side of the end weir and the magnetic field amplification plate on the side of the top weir, the magnetic field amplification plate disposed on the side of the end dam is given as an example. In each figure, 3 indicates an end weir.

【0029】図5は図4の形状の磁場増幅板の拡大図で
あり、(a)は平面図、(b)は(a)におけるV−V
矢視図である。この磁場増幅板9aでは、磁場増幅板9
aを2つに区画する溝12及び凹部13から内側(堰3
側)に達する溝14の深さdは前記(1)式によって求
めたδの2倍以上程度にする。そして、凹部13の深さ
も溝12及び溝14の深さdと同じにする。又、溝12
及び溝14の幅w1 は上記δの0.5〜3倍程度にする
のがよい。更に、凹部13と堰3側端部との間隔Bは上
記δにの5〜30倍程度にするのがよい。
FIG. 5 is an enlarged view of the magnetic field amplifying plate having the shape shown in FIG. 4, (a) is a plan view, and (b) is VV in (a).
It is an arrow view. In this magnetic field amplification plate 9a, the magnetic field amplification plate 9a
a from the groove 12 and the recess 13 that divide a into two (weir 3
The depth d of the groove 14 reaching the side) is set to about twice or more of δ obtained by the equation (1). The depth of the recess 13 is also set to be the same as the depth d of the groove 12 and the groove 14. Also, the groove 12
The width w 1 of the groove 14 is preferably about 0.5 to 3 times the above δ. Further, the interval B between the recess 13 and the end on the weir 3 side is preferably about 5 to 30 times the above δ.

【0030】図6は磁場増幅板の他の実施例を示し、
(a)は平面図、(b)は(a)におけるVI−VI矢視図
である。この磁場増幅板は、間隙15が設けられて端部
堰3の長手方向に2区画に分割されており、各区画の中
には切り欠き部16が設けられている。そして、それぞ
れの区画には切り欠き部16から内側(堰3側)に達す
る間隙17が設けられ、上記各区画が開環した形状にな
っている。この磁場増幅板9aの厚さtは前記(1)式
によって求めたδの0.3倍以上にする。しかし、間隙
15の幅w2 及び間隙17の幅w2 は、図5に設ける溝
の深さw1 と同じ程度でよい。
FIG. 6 shows another embodiment of the magnetic field amplification plate,
(A) is a plan view, (b) is a VI-VI arrow view in (a). This magnetic field amplification plate is divided into two sections in the longitudinal direction of the end dam 3 with a gap 15 provided, and a cutout section 16 is provided in each section. Then, a gap 17 reaching the inside (side of the weir 3) from the cutout portion 16 is provided in each compartment, and each compartment has an open ring shape. The thickness t of the magnetic field amplification plate 9a is set to 0.3 times or more of δ obtained by the equation (1). However, the width w 2 of a width w 2 and the gap 17 of the gap 15 may be the same extent as the depth w 1 of the groove provided in Figure 5.

【0031】図7は磁場増幅板の更に他の実施例を示す
図であり、(a)は平面図、(b)は(a)における V
II−VII 矢視図である。この実施例では、冷却箱の上板
が磁場増幅板と兼用になっており、冷却箱10の上板に
は、図5と同様に、磁場増幅板9aを2つに区画する溝
12と凹部13及び凹部13から内側(堰3側)に達す
る溝14が設けられている。そして、溝12、溝14、
凹部13の深さや溝12、溝14の幅は図5の場合と同
じである。
7A and 7B are views showing still another embodiment of the magnetic field amplifying plate. FIG. 7A is a plan view and FIG. 7B is a view showing V in FIG.
It is a II-VII arrow line view. In this embodiment, the upper plate of the cooling box is also used as the magnetic field amplifying plate, and the upper plate of the cooling box 10 has a groove 12 and a recess for dividing the magnetic field amplifying plate 9a into two, as in FIG. A groove 14 that extends from the recess 13 and the recess 13 to the inside (the side of the dam 3) is provided. Then, the groove 12, the groove 14,
The depth of the recess 13 and the widths of the groove 12 and the groove 14 are the same as in the case of FIG.

【0032】上記図5〜図7の磁場増幅板においては、
磁場増幅板を区画する溝12や間隙15の数、凹部13
や切り欠き部16から内側(堰3側)に達する溝14や
間隙17の数が1条の場合についてのみ説明したが、溝
や間隙の数は磁場増幅板の大きさによって決められるも
のであり、その数は特定されない。
In the magnetic field amplifying plate shown in FIGS. 5 to 7,
The number of grooves 12 and gaps 15 that partition the magnetic field amplification plate, and recesses 13
Only the case where the number of the grooves 14 and the gaps 17 reaching the inner side (the side of the weir 3) from the notches 16 is 1 has been described, but the number of the grooves and the gaps is determined by the size of the magnetic field amplification plate. , The number is not specified.

【0033】上記図5の形状の磁場増幅板を備えた図1
又は図2の装置において、高周波コイルに通電すると、
磁場増幅板には相互誘導作用によって誘導電流が流れ
る。この際の誘導電流の流れを図8によって説明する。
図8は図5の磁場増幅板における誘導電流の流れを示し
た図である。誘導電流は、溝12、14及び凹部13の
箇所でその流れが阻止されるので、図中、矢印で示した
ように、溝12、14と凹部13で区画された領域の周
辺を流れる。このため、磁場増幅板9aの内側(堰3
側)に流れる誘導電流の密度が大きくなり、3重点部に
大きな磁気圧力が極めて正確に作用する。
FIG. 1 equipped with a magnetic field amplification plate having the shape shown in FIG.
Or, in the apparatus of FIG. 2, when the high frequency coil is energized,
An induced current flows through the magnetic field amplification plate due to the mutual induction effect. The flow of the induced current at this time will be described with reference to FIG.
FIG. 8 is a diagram showing the flow of the induced current in the magnetic field amplification plate of FIG. The flow of the induced current is blocked at the grooves 12 and 14 and the recess 13, so that the induced current flows around the region defined by the grooves 12 and 14 and the recess 13 as shown by the arrow in the figure. Therefore, the inside of the magnetic field amplification plate 9a (the weir 3
The density of the induced current flowing to the side) becomes large, and a large magnetic pressure acts on the triple points extremely accurately.

【0034】なお、磁場増幅板9aにおける凹部13と
堰3側端部との間隔Bが、前記(1)式で求めたδの5
倍未満であると、誘導電流同士が反発してその流れが悪
くなる。又、上記間隔Bが上記δの30倍を超えると、
電流の流れる領域が拡がり過ぎるため、誘導電流の密度
が小さくなる。このように、上記何れの場合にあっても
3重点部における磁気圧力が低下する。
The interval B between the concave portion 13 and the end portion on the weir 3 side of the magnetic field amplification plate 9a is δ of 5 determined by the above equation (1).
If it is less than twice, the induced currents repel each other and the flow thereof deteriorates. If the distance B exceeds 30 times δ,
Since the region where the current flows is too wide, the density of the induced current becomes small. Thus, in any of the above cases, the magnetic pressure at the triple point decreases.

【0035】上述のように構成された装置においては、
高周波コイル5に大電流を通電しなくても、3重点部に
空間が形成され、表面性状が良好な鋼板を製造すること
ができる。更に、3重点部では、渦電流の発生に伴う加
熱が同時に効率よく行われるため、3重点部近傍での溶
鋼の凝固が防止され、製造される鋼板の表面性状は一層
改善される。
In the device constructed as described above,
Even if a high current is not applied to the high frequency coil 5, a space is formed at the triple point and a steel sheet having a good surface quality can be manufactured. Further, in the triple point, heating accompanied by the generation of the eddy current is efficiently performed at the same time, so that the solidification of the molten steel in the vicinity of the triple point is prevented, and the surface quality of the manufactured steel sheet is further improved.

【0036】次に、図5の磁場増幅板を備え図1の構成
による実施例の装置おける電磁圧力と、磁場増幅板を有
しない従来の装置における電磁圧力をそれぞれシミュレ
ーションによって求めた。この結果、3重点における電
磁圧力の値はそれぞ次の通りであり、実施例における電
磁圧力は従来技術の場合の12倍になった。なお、電磁
圧力は溶鋼柱換算で表した。
Next, the electromagnetic pressure in the device of the embodiment having the magnetic field amplifying plate of FIG. 5 and the electromagnetic pressure in the conventional device having no magnetic field amplifying plate were obtained by simulation. As a result, the values of the electromagnetic pressure at the three points are as follows, and the electromagnetic pressure in the example is 12 times that of the conventional technique. The electromagnetic pressure is expressed in terms of molten steel column.

【0037】 実施例の装置の電磁圧力 約 120 cm 従来の装置の電磁圧力 約 10 cm 各条件は次のごとくに設定した。Electromagnetic pressure of the apparatus of the example is about 120 cm Electromagnetic pressure of the conventional apparatus is about 10 cm Each condition is set as follows.

【0038】実施例の条件 高周波電流 3000 A 周波数 3000 Hz 磁場増幅板の材料 高純度銅 磁場増幅板の厚さ 4.0 mm 磁場増幅板の溝の深さ 2.0 mm 磁場増幅板の溝の幅 2.0 mm 磁場増幅板の比透磁率 1 磁場増幅板の電気伝導度 3.4×107 Ω-1-1 従来技術の条件 高周波電流 3000 A 周波数 3000 HzConditions of Examples High-frequency current 3000 A Frequency 3000 Hz Material of magnetic field amplification plate High-purity copper Magnetic field amplification plate thickness 4.0 mm Depth of magnetic field amplification plate groove 2.0 mm Magnetic field amplification plate groove width 2.0 mm Magnetic field Relative permeability of the amplifying plate 1 Electric conductivity of the magnetic field amplifying plate 3.4 × 10 7 Ω −1 m −1 Condition of the prior art High frequency current 3000 A Frequency 3000 Hz

【0039】[0039]

【発明の効果】本発明においては、冷却ロ−ルと堰及び
溶鋼が接する3重点部の近傍に沿った堰の外側に誘導電
流を発生させるための高周波コイルを備えると共に、こ
の高周波コイルに近接して磁場増幅板を配設し、この磁
場増幅板には誘導電流の通電を阻止する溝や間隙等の部
分を堰側から外側に向けて筋状に設けている。
According to the present invention, a high frequency coil for generating an induced current is provided outside the weir along the vicinity of the triple point where the cooling roll contacts the weir and the molten steel. Then, the magnetic field amplification plate is provided, and the magnetic field amplification plate is provided with a groove, a gap, or the like that blocks conduction of an induced current in a streak shape from the weir side to the outside.

【0040】本発明を使用すれば、誘導電流は上記の溝
や間隙等の部分によってその流れが阻止され、磁場増幅
板の周辺を高密度で流れるので、堰側周辺(3重点部近
傍)に強い磁気圧力が集中的に印加される。このため、
高周波電源を大容量にすることなく、安定した状態で、
表面性状が良好な鋼板を鋳造できる。
When the present invention is used, the flow of the induced current is blocked by the above-mentioned grooves and gaps and flows at a high density around the magnetic field amplifying plate. Strong magnetic pressure is applied intensively. For this reason,
In a stable state without increasing the capacity of the high frequency power supply,
It is possible to cast steel plates with good surface properties.

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

【図1】本発明の一実施例を示す図である。FIG. 1 is a diagram showing an embodiment of the present invention.

【図2】本発明の他の実施例を示す図である。FIG. 2 is a diagram showing another embodiment of the present invention.

【図3】図1の連続鋳造装置における磁場増幅板の配置
及び形状を示す図である。
FIG. 3 is a view showing the arrangement and shape of magnetic field amplification plates in the continuous casting apparatus of FIG.

【図4】図2の連続鋳造装置における磁場増幅板の配置
及び形状を示す図である。
FIG. 4 is a view showing the arrangement and shape of magnetic field amplification plates in the continuous casting apparatus of FIG.

【図5】本発明の装置に備える磁場増幅板の一実施例を
示し、図4に配設された磁場増幅板の拡大図である。
5 is an enlarged view of the magnetic field amplification plate arranged in FIG. 4, showing an embodiment of the magnetic field amplification plate provided in the device of the present invention.

【図6】磁場増幅板の他の実施例を示す図である。FIG. 6 is a diagram showing another embodiment of the magnetic field amplification plate.

【図7】磁場増幅板の更に他の実施例を示し、冷却箱の
上板を磁場増幅板と兼用にした場合の構成を示す図であ
る。
FIG. 7 is a view showing still another embodiment of the magnetic field amplifying plate, showing a configuration when the upper plate of the cooling box is also used as the magnetic field amplifying plate.

【図8】本発明の磁場増幅板における誘導電流の流れを
示す図である。
FIG. 8 is a diagram showing a flow of an induced current in the magnetic field amplification plate of the present invention.

【図9】従来の双ロ−ル式鋼板の連続鋳造装置を示す図
である。
FIG. 9 is a view showing a conventional twin-roll steel plate continuous casting apparatus.

【図10】高周波コイルの作用に係る説明図である。FIG. 10 is an explanatory diagram related to the action of the high frequency coil.

【符号の説明】[Explanation of symbols]

1a,1b 冷却ロ−ル 2 溶鋼 3 端部堰 4 頂部堰 5 高周波コイル 6 冷却ロ−ルに生成した凝固シェル 7 鋼板 8 堰に生成した凝固シェル 9a,9b 磁場増幅板 10,11 冷却箱 12 内側(堰側)から外側に達して設けられ、磁場増
幅板を区画する溝 13 磁場増幅板に設けられた凹部 14 凹部から内側(堰側)に達して設けられた溝 15 磁場増幅板を堰の長手方向に分割する間隙 16 磁場増幅板の中に設けた切り欠き部 17 切り欠き部から内側(堰側)に達して設けられた
間隙
1a, 1b Cooling roll 2 Molten steel 3 Edge weir 4 Top weir 5 High frequency coil 6 Solidification shell 7 produced in cooling roll 7 Steel plate 8 Solidification shell produced in weir 9a, 9b Magnetic field amplification plate 10, 11 Cooling box 12 Grooves that extend from the inside (weir side) to the outside to partition the magnetic field amplification plate 13 Recesses provided on the magnetic field amplification plate 14 Grooves provided from the recesses to the inside (weir side) 15 Weir the magnetic field amplification plate 16 A gap formed in the longitudinal direction of the gap 16 A notch provided in the magnetic field amplification plate 17 A gap provided from the notch to the inside (weir side)

───────────────────────────────────────────────────── フロントページの続き (72)発明者 中田 正之 東京都千代田区丸の内1丁目1番2号 日 本鋼管株式会社内 (72)発明者 大迫 隆志 東京都千代田区丸の内1丁目1番2号 日 本鋼管株式会社内 (72)発明者 森 健太郎 東京都千代田区丸の内1丁目1番2号 日 本鋼管株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masayuki Nakata, 1-2, Marunouchi, Chiyoda-ku, Tokyo Japan Steel Pipe Co., Ltd. (72) Takashi Osako, 1-2, Marunouchi, Chiyoda-ku, Tokyo Date Inside the Steel Pipe Corporation (72) Inventor Kentaro Mori 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Inside Nihon Steel Pipe Corporation

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 それぞれが水平で互いに平行に配設され
対向する外周面がそれぞれ内側に移動する方向に回転す
る一対の冷却ロ−ルと、この一対の冷却ロ−ルと共に溶
鋼を溜める湯溜り部を区画形成する堰を有する双ロ−ル
式連続鋳造装置において、前記冷却ロ−ルと前記堰及び
溶鋼が接する3重点部の近傍に沿った前記堰の外側に誘
導電流を発生させるための高周波コイルが備えられ、こ
の高周波コイルに近接して磁場増幅板が配設され、この
磁場増幅板には冷却箱が付設されると共に前記高周波コ
イルから発生する誘導電流の通電を阻止する部分が前記
堰側から外側に向けて筋状に設けられていることを特徴
とする鋼板の連続鋳造装置。
1. A pair of cooling rolls, each of which is arranged horizontally and parallel to each other, and whose outer peripheral surfaces facing each other rotate in a direction to move inward, respectively, and a pool for collecting molten steel together with the pair of cooling rolls. In a twin roll type continuous casting apparatus having a weir that divides and forms a section, for generating an induced current outside the weir along the vicinity of the triple point where the cooling roll contacts the weir and the molten steel. A high-frequency coil is provided, a magnetic field amplification plate is disposed in the vicinity of the high-frequency coil, a cooling box is attached to the magnetic field amplification plate, and a portion for blocking conduction of an induction current generated from the high-frequency coil is provided. A continuous casting apparatus for steel plates, which is provided in a streak shape from the weir side to the outside.
【請求項2】 磁場増幅板に設ける誘導電流の通電を阻
止するための筋状の部分が少なくとも一条の溝であるこ
とを特徴とする請求項1記載の鋼板の連続鋳造装置。
2. The continuous casting apparatus for a steel sheet according to claim 1, wherein the streak-like portion provided in the magnetic field amplifying plate for blocking the conduction of the induced current is at least one groove.
【請求項3】 磁場増幅板に設ける誘導電流の通電を阻
止するための筋状の部分が少なくとも一条の間隙である
ことを特徴とする請求項1記載の鋼板の連続鋳造装置。
3. The continuous casting apparatus for a steel sheet according to claim 1, wherein the streak-like portion provided in the magnetic field amplifying plate for blocking the conduction of the induction current is at least one gap.
【請求項4】 それぞれが水平で互いに平行に配設され
対向する外周面がそれぞれ内側に移動する方向に回転す
る一対の冷却ロ−ルと、この一対の冷却ロ−ルと共に溶
鋼を溜める湯溜り部を区画形成する堰を有する双ロ−ル
式連続鋳造装置において、前記冷却ロ−ルと前記堰及び
溶鋼が接する3重点部の近傍に沿った前記堰の外側に誘
導電流を発生させるための高周波コイルが備えられ、こ
の高周波コイルに近接して冷却箱が配設され、この冷却
箱の上板には前記高周波コイルから発生する誘導電流の
通電を阻止する部分が前記堰側から外側に向けて筋状に
設けられていることを特徴とする鋼板の連続鋳造装置。
4. A pair of cooling rolls, each of which is arranged horizontally and parallel to each other, and whose outer peripheral surfaces facing each other rotate in a direction moving inward, respectively, and a pool for pooling molten steel together with the pair of cooling rolls. In a twin roll type continuous casting apparatus having a weir that divides and forms a section, for generating an induced current outside the weir along the vicinity of the triple point where the cooling roll contacts the weir and the molten steel. A high-frequency coil is provided, and a cooling box is arranged in the vicinity of the high-frequency coil, and a portion for blocking conduction of an induction current generated from the high-frequency coil is provided on the upper plate of the cooling box from the weir side to the outside. A continuous casting apparatus for steel plates, which is provided in a streak shape.
JP22605991A 1991-09-05 1991-09-05 Continuously casting device for steel sheet Pending JPH0557404A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22605991A JPH0557404A (en) 1991-09-05 1991-09-05 Continuously casting device for steel sheet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22605991A JPH0557404A (en) 1991-09-05 1991-09-05 Continuously casting device for steel sheet

Publications (1)

Publication Number Publication Date
JPH0557404A true JPH0557404A (en) 1993-03-09

Family

ID=16839159

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22605991A Pending JPH0557404A (en) 1991-09-05 1991-09-05 Continuously casting device for steel sheet

Country Status (1)

Country Link
JP (1) JPH0557404A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11203409B2 (en) 2018-02-19 2021-12-21 Charles J. Fenske Geometric morphing wing with adaptive corrugated structure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11203409B2 (en) 2018-02-19 2021-12-21 Charles J. Fenske Geometric morphing wing with adaptive corrugated structure

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