JP2003181603A - Pouring nozzle for casting thin strip-like slab - Google Patents
Pouring nozzle for casting thin strip-like slabInfo
- Publication number
- JP2003181603A JP2003181603A JP2001387829A JP2001387829A JP2003181603A JP 2003181603 A JP2003181603 A JP 2003181603A JP 2001387829 A JP2001387829 A JP 2001387829A JP 2001387829 A JP2001387829 A JP 2001387829A JP 2003181603 A JP2003181603 A JP 2003181603A
- Authority
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- Japan
- Prior art keywords
- molten metal
- casting
- flat
- pouring nozzle
- nozzle
- 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.)
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Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は双ドラム式連続鋳造
方法において、薄帯鋳片の鋳造に使用する注湯ノズルに
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pouring nozzle used for casting a strip cast in a twin-drum type continuous casting method.
【0002】[0002]
【従来の技術】回転軸を水平にして互いに接近し反対方
向へ回転する一対の冷却ドラムと、冷却ドラムの両端面
に圧着した一対のサイド堰とで形成された湯溜り部に、
注湯ノズルを介して溶湯を注湯して薄帯鋳片(以下、単
に「鋳片」ということがある)を製造する双ドラム式連
続鋳造方法において、安定した製造技術によって均一な
品質を有する鋳片を製造するために、種々の技術が用い
られている。2. Description of the Related Art A pool of water formed by a pair of cooling drums having rotating shafts horizontally approaching each other and rotating in opposite directions, and a pair of side dams crimped to both end surfaces of the cooling drum,
A twin-drum type continuous casting method in which molten strip is poured through a pouring nozzle to produce thin strip cast pieces (hereinafter sometimes simply referred to as "cast pieces"), which has a uniform quality due to stable manufacturing technology. Various techniques have been used to produce cast slabs.
【0003】例えば特開昭64−5650号公報には、
湯溜り部の溶湯表面上での凝固物生成を防止しつつ、溶
湯表面の波立ちを防止する方法と装置が開示されてい
る。この従来技術は、注湯ノズルを湯溜り部に浸漬し
て、溶湯を概ね水平方向に吐出する方法である。この技
術を用いることで、溶湯表面上での凝固物生成を防止す
ることができ、また、溶湯表面の波立ちを防止すること
ができるので、冷却ドラム周面上での凝固シェルの生成
を安定化させることができる。For example, in Japanese Patent Laid-Open No. 64-5650,
A method and an apparatus for preventing the formation of a solidified product on the surface of the molten metal in the molten metal pool while preventing the surface of the molten metal from waviness are disclosed. This conventional technique is a method of immersing a pouring nozzle in a basin and discharging the molten metal in a substantially horizontal direction. By using this technology, it is possible to prevent the formation of solidified matter on the surface of the molten metal, and to prevent the surface of the molten metal from waviness, thus stabilizing the formation of the solidified shell on the peripheral surface of the cooling drum. Can be made.
【0004】しかし、溶湯を水平方向に吐出するこの従
来技術によると、湯溜り部下部での溶湯温度の不均一化
が避けられず、冷却ドラム最近接点における鋳片の形成
が不安定化する問題が発生する。すなわち、注湯ノズル
から水平方向に吐出した溶湯は冷却ドラムに接近した後
に下降し、さらに冷却ドラムの回転に伴う粘性流と熱対
流によって流動速度は加速されるものの、いずれによっ
ても鉛直下方に向かうベクトルは小さく、注湯吐出流は
鋳片幅方向に拡散しながら下降する。これにより、湯溜
り部下部において幅方向にわたって溶湯の温度が不均一
化することが避けられない。この温度不均一の偏差が例
え僅かであっても、冷却ドラムの最近接点において凝固
シェルが張り合わされて鋳片を形成する際には大きく影
響するため、製品品質の均一性が著しく損なわれるので
ある。However, according to this prior art in which the molten metal is discharged in the horizontal direction, inhomogeneity of the molten metal temperature in the lower part of the pool is unavoidable, and the formation of the slab at the closest contact point of the cooling drum becomes unstable. Occurs. That is, the molten metal discharged horizontally from the pouring nozzle approaches the cooling drum and then descends, and the flow velocity is accelerated by viscous flow and thermal convection accompanying the rotation of the cooling drum, but in any case it goes vertically downward. The vector is small, and the pouring discharge flow descends while spreading in the width direction of the slab. As a result, it is inevitable that the temperature of the molten metal becomes uneven in the width direction in the lower part of the pool. Even if the deviation of this temperature nonuniformity is slight, it has a great influence when the solidified shells are stuck together at the closest contact point of the cooling drum to form a slab, so that the uniformity of product quality is significantly impaired. .
【0005】注湯ノズルから水平方向に溶湯を吐出させ
つつ幅方向の温度分布を均一化させるためには、注湯ノ
ズル幅を冷却ドラム幅とほぼ同一の幅にしなければなら
ない。この場合、例えば、板幅1000mm以上の薄帯
鋳片を製造するための注湯ノズルは大型で構造が複雑と
なり、製作に当たり技術的に非常に難しくかつ高価とな
る。In order to discharge the molten metal from the pouring nozzle in the horizontal direction and to make the temperature distribution in the width direction uniform, the pouring nozzle width must be substantially the same as the cooling drum width. In this case, for example, a pouring nozzle for manufacturing a strip cast product having a plate width of 1000 mm or more is large and has a complicated structure, which is technically very difficult and expensive to manufacture.
【0006】一方、特開平2−258145号公報に
は、溶湯の下向き流動速度を鋳片板幅方向にほぼ均一に
する装置が開示されている。この装置は、タンディッシ
ュの溶湯流下口に中子を取り付け、この中子のスリット
間に上下2つのマニホールドを設けている。このような
構成を有することによって、溶湯のスリットでの通過抵
抗により各マニホールドで溶湯を一旦滞留して鋳片板幅
方向での溶湯の流動速度を平均化して、溶湯の下向き流
動速度を鋳片板幅方向にわたりほぼ均一にできる。On the other hand, Japanese Unexamined Patent Publication (Kokai) No. 2-258145 discloses an apparatus for making the downward flow velocity of the molten metal substantially uniform in the width direction of the slab. In this device, a core is attached to the molten metal outlet of the tundish, and two manifolds are provided above and below between the slits of the core. By having such a structure, the molten metal is retained in each manifold due to the passage resistance of the molten metal at the slits, and the molten metal flow velocity in the width direction of the slab is averaged, so that the downward flow velocity of the molten metal It can be made almost uniform in the plate width direction.
【0007】しかし、この方法においては、溶湯が主と
して鉛直下方に向かうため、溶湯表面上での溶湯の攪拌
更新がおろそかとなって滞留し、凝固物の生成を十分に
防止することができない。特に、サイド堰と冷却ドラム
両端部の接点近傍は、とりわけ溶湯が滞留しやすいので
あるが、そこに凝固物が付着し生成した後に脱落して鋳
片に巻き込まれると、鋳片品質の均一性の阻害はもとよ
り鋳造の停止にも繋がる問題が発生する。さらに、この
技術も溶湯の偏流防止のため鋳片幅とほぼ等しい幅の注
湯ノズルが必要であり、装置の構造が複雑かつ高価とな
る。However, in this method, since the molten metal mainly goes vertically downward, the stirring and renewal of the molten metal on the surface of the molten metal neglects and stays, and it is not possible to sufficiently prevent the formation of a solidified product. Especially near the contact points between the side weir and both ends of the cooling drum, the molten metal is particularly likely to stay. In addition to hindering the casting, there is a problem that it can also stop casting. Furthermore, this technique also requires a pouring nozzle having a width substantially equal to the width of the cast piece in order to prevent uneven flow of the molten metal, which makes the structure of the apparatus complicated and expensive.
【0008】[0008]
【発明が解決しようとする課題】上記の従来技術ではい
ずれも、湯溜り部内の溶湯の温度を鋳片幅方向かつ鉛直
方向にわたって均一化することが困難であった。水平方
向の溶湯流動が遅滞すると溶湯表面上に凝固物が生成
し、鉛直下方の溶湯流動が遅滞すると冷却ドラム最近接
点での凝固シェルの張り合わせが不均一となる問題が発
生する。板幅1000mm以上の薄帯鋳片を製造するに
あたり、従来技術によってこれらの問題を回避するため
には、装置の構造を大型かつ複雑化させる必要があっ
た。In all of the above conventional techniques, it was difficult to make the temperature of the molten metal in the molten metal pool uniform in the width direction of the slab and in the vertical direction. If the horizontal flow of the molten metal is delayed, a solidified product is generated on the surface of the molten metal, and if the molten metal flow below the vertical direction is delayed, the solidified shells at the closest contact point of the cooling drum become non-uniform. In manufacturing a strip cast having a plate width of 1000 mm or more, in order to avoid these problems by the conventional technique, it was necessary to make the structure of the device large and complicated.
【0009】本発明は、湯溜り部内の溶湯温度を全体的
に均一化させて、溶湯表面上の凝固物を防止しつつ凝固
シェル張り合わせの安定化と均一化を図るための、小型
で簡便でありかつ安価な注湯ノズルを提供することを課
題とする。According to the present invention, the temperature of the molten metal in the molten metal pool is made uniform to prevent the solidified matter on the surface of the molten metal and to stabilize and uniformize the solidified shell bonding, which is small and simple. It is an object to provide a pouring nozzle that is available at a low cost.
【0010】[0010]
【課題を解決するための手段】本発明の要旨とするとこ
ろは以下のとおりである。
(1)溶湯が通過する空間の水平断面形状が偏平状であ
る偏平ノズル孔を下部に有する注湯ノズルであって、該
偏平ノズル孔の幅狭壁面に横向き開口部と、該偏平注湯
ノズル孔の下端にスリット状の下向き開口部とを有する
ことを特徴とする薄帯鋳片鋳造用注湯ノズル。
(2)前記偏平ノズル孔の対向する幅狭壁面各々の形状
は下狭まり状であり、かつ対向する幅広壁面各々の形状
は下広がり状であることを特徴とする前記(1)に記載
の薄帯鋳片鋳造用注湯ノズル。
(3)前記幅狭壁面の横向き開口部は縦長状であること
を特徴とする前記(1)又は(2)に記載の薄帯鋳片鋳
造用注湯ノズル。
(4)前記幅狭壁面の横向き開口部は下狭まり状である
ことを特徴とする前記(3)に記載の薄帯鋳片鋳造用注
湯ノズル。
(5)前記偏平ノズル孔の幅広壁面に横向き開口部を有
することを特徴とする前記(1)乃至(4)の何れかに
記載の鋳片鋳造用注湯ノズル。
(6)前記幅広壁面の横向き開口部は横長状であること
を特徴とする前記(5)に記載の薄帯鋳片鋳造用注湯ノ
ズル。
(7)前記偏平ノズル孔の下端に対向する幅広壁面同士
を連結した連結部を有することを特徴とする前記(1)
乃至(6)の何れかに記載の薄帯鋳片鋳造用注湯ノズ
ル。
(8)前記連結部の上面は幅広壁面側から見て一対の傾
斜面で形成された山型状であることを特徴とする前記
(7)に記載の薄帯鋳片鋳造用注湯ノズル。The main points of the present invention are as follows. (1) A pouring nozzle having a flat nozzle hole in a lower portion of which a horizontal cross-sectional shape of a space through which the molten metal passes is flat, wherein a lateral opening is formed in a narrow wall surface of the flat nozzle hole, and the flat pouring nozzle. A pouring nozzle for casting a thin strip cast product, which has a slit-shaped downward opening at the lower end of the hole. (2) The thin wall surface according to (1), wherein each of the narrow wall surfaces facing each other of the flat nozzle hole has a shape narrowing downward, and each of the wide wall surfaces facing each other has a shape spreading downward. Pouring nozzle for strip casting. (3) The pouring nozzle for casting thin strip slabs according to (1) or (2), wherein the lateral opening of the narrow wall surface is vertically long. (4) The pouring nozzle for casting thin strip cast slabs according to (3), wherein the lateral opening of the narrow wall surface is narrowed downward. (5) The slab casting pouring nozzle according to any one of (1) to (4), wherein the flat nozzle hole has a lateral opening on a wide wall surface. (6) The casting nozzle for casting thin strip slabs according to (5), characterized in that the lateral opening of the wide wall surface is horizontally long. (7) The above-mentioned (1), which has a connecting portion that connects wide wall surfaces facing each other at the lower end of the flat nozzle hole.
A pouring nozzle for casting a strip cast product according to any one of (6) to (6). (8) The casting nozzle for casting thin strip slabs according to (7), wherein the upper surface of the connecting portion has a mountain shape formed by a pair of inclined surfaces when viewed from the side of the wide wall surface.
【0011】[0011]
【発明の実施の形態】以下に本発明の原理と機能につい
て説明する。一般的に溶融金属の多くは温度低下により
比重が増加するので熱対流によって下降する。そのた
め、湯溜り部内の溶湯は上部が熱く下部が冷たくなり、
不均一になり易い。双ドラム式連続鋳造方法では、湯溜
り部内の溶湯温度分布を不均一化させる要因がさらに2
つある。ひとつは(1)溶湯が下方に回転する冷却ドラ
ムによって冷却されつつ粘性流によって下降すること
と、もうひとつは(2)一対の冷却ドラムによる凝固シ
ェルの圧着に際して凝固シェルに付随する凝固直前の低
温溶鋼が絞り上げられて湯溜り部内に移動することであ
る。BEST MODE FOR CARRYING OUT THE INVENTION The principle and function of the present invention will be described below. Generally, most of the molten metal has its specific gravity increased due to the temperature decrease, so that it is lowered by thermal convection. Therefore, the upper part of the molten metal in the pool is hot and the lower part is cold,
It tends to be uneven. In the twin drum type continuous casting method, there are two additional factors that make the temperature distribution of the molten metal in the molten metal pool uneven.
There is one. One is (1) the molten metal descends by viscous flow while being cooled by the cooling drum rotating downward, and the other is (2) the low temperature immediately before solidification accompanying the solidification shell when the solidification shell is pressed by the pair of cooling drums. That is, molten steel is squeezed and moved into the pool.
【0012】これらの現象は双ドラム式連続鋳造方法に
おいては必然的に発生する特有の現象である。そのた
め、湯溜り部内の溶湯を十分攪拌し、溶湯温度の均一化
を図ることが極めて重要である。These phenomena are peculiar phenomena inevitably occurring in the twin drum type continuous casting method. Therefore, it is extremely important to sufficiently stir the molten metal in the molten metal pool portion so as to make the molten metal temperature uniform.
【0013】さて、前記に述べた湯溜り部内の温度分布
を不均一化させる要因の内、(2)の冷却ドラムによる
低温溶鋼の絞り上げは、冷却ドラムの最近接点の近傍で
発生するが、円筒状の冷却ドラムを近接させて凝固シェ
ルを張り合わせるレイアウトであるが故に、冷却ドラム
の最近接点の近傍では、湯溜り部が極めて狭隘となる。
そのため、湯溜り部の上部から狭隘部に間接的に溶湯を
送り込む溶湯供給方法では、狭隘部の溶湯を充分攪拌す
ることができない。よって、注湯吐出流を下向きにし
て、溶湯を直接的に狭隘部に向けて供給する必要があ
る。Among the factors for making the temperature distribution in the basin part non-uniform as described above, (2) the low temperature molten steel is drawn up by the cooling drum in the vicinity of the closest contact point of the cooling drum. Since the layout is such that the cylindrical cooling drums are brought close to each other and the solidified shells are bonded to each other, the molten metal pool is extremely narrow near the nearest contact point of the cooling drum.
Therefore, the molten metal in the narrow portion cannot be sufficiently agitated by the molten metal supply method in which the molten metal is indirectly sent from the upper part of the pool portion to the narrow portion. Therefore, it is necessary to direct the pouring discharge flow downward and supply the molten metal directly toward the narrow portion.
【0014】溶湯を狭隘部に向けて幅方向均一に供給す
るためには、図1〜図3に示すように、注湯ノズル13
の下端に鋳片幅方向に細長いスリット状の開口部9を形
成する。スリット状の開口部9の代わりとして、小径の
開口部を鋳片幅方向に密に配列することも可能である
が、注湯ノズル閉塞の懸念がある点では好ましくない。In order to uniformly supply the molten metal to the narrow portion in the width direction, as shown in FIGS. 1 to 3, the pouring nozzle 13 is used.
An elongated slit-shaped opening 9 is formed in the lower end of the slab in the width direction of the slab. As an alternative to the slit-shaped openings 9, small-diameter openings may be densely arranged in the width direction of the slab, but this is not preferable because there is a risk of clogging of the pouring nozzle.
【0015】ところで、注湯吐出流の方向が下向きだけ
では、湯溜り部表面上の溶湯流動が遅滞するので、凝固
物の生成が避けられない。また、凝固物はサイド堰の壁
面に生成し易いことを勘案すると、偏平ノズル孔1aの
下端にスリット状の下向き開口部9を設けるだけでな
く、幅狭壁面6に横向き開口部4を設けて、湯溜り部上
部の溶湯攪拌を図る必要がある。By the way, if the direction of the pouring discharge flow is only downward, the flow of the molten metal on the surface of the molten metal pool is delayed, so that the formation of a solidified product cannot be avoided. Further, considering that the solidified matter is easily generated on the wall surface of the side dam, not only the slit-shaped downward opening 9 is provided at the lower end of the flat nozzle hole 1a, but also the lateral opening 4 is provided on the narrow wall surface 6. It is necessary to stir the molten metal in the upper part of the pool.
【0016】さらに、湯溜り部11内の鉛直方向の溶湯
攪拌を図るために、幅狭壁面6の横向き開口部4は縦長
に設定するのが望ましい。また必要であれば、幅広壁面
7にも開口部5を追加すると溶湯の攪拌更新が一層促進
されて好適である。Further, in order to agitate the molten metal in the vertical direction in the pool 11, it is desirable that the lateral opening 4 of the narrow wall surface 6 is set to be vertically long. Further, if necessary, it is preferable to add the opening 5 to the wide wall surface 7 because the stirring and renewal of the molten metal is further promoted.
【0017】下端にスリット状の下向き開口部9を設け
た偏平ノズル孔1a内での溶湯の偏流を防ぐためには、
偏平ノズル孔1aの幅狭壁面6を下狭まり状にし、幅広
壁面7を下広がり状にし、水平断面での偏平率が鉛直方
向で滑らかに変化するように形成することが望ましい。In order to prevent uneven flow of the molten metal in the flat nozzle hole 1a having the slit-shaped downward opening 9 at the lower end,
It is desirable that the narrow wall surface 6 of the flat nozzle hole 1a is narrowed downward and the wide wall surface 7 is widened downward so that the flatness in a horizontal section changes smoothly in the vertical direction.
【0018】偏平ノズル孔1a内の偏流を防ぐ方法とし
て、偏平ノズル孔1aの下端に広幅面同士を連結するよ
うに連結部8を設置し、さらに連結部8の上面を広幅壁
面7側から見て一対の傾斜面8aと8aで形成された山
形状に設定すると、連結部8が分水嶺となって溶湯流動
が左右で対称形に分配されてドラム両端部に向かう。な
お、連結部8は強度補強部材としても機能する。As a method of preventing uneven flow in the flat nozzle hole 1a, a connecting portion 8 is installed at the lower end of the flat nozzle hole 1a so as to connect the wide surfaces, and the upper surface of the connecting portion 8 is viewed from the wide wall surface 7 side. When a mountain shape is formed by a pair of inclined surfaces 8a and 8a, the connecting portion 8 serves as a watershed and the molten metal flow is symmetrically distributed to the left and right ends of the drum. The connecting portion 8 also functions as a strength reinforcing member.
【0019】本発明者らは以上の考察に基づいて、双ド
ラム式連続鋳造方法において、湯溜り部内の溶湯温度を
効果的に均一化できる、構造簡単で安価な注湯ノズルを
発明した。以下に本発明の実施の形態について図1乃至
図4を参照して具体的に説明する。Based on the above consideration, the inventors of the present invention have invented a pouring nozzle with a simple structure and a low cost, which can effectively equalize the temperature of the molten metal in the molten metal pool in the twin-drum type continuous casting method. Embodiments of the present invention will be specifically described below with reference to FIGS. 1 to 4.
【0020】本発明による注湯ノズル13は、ノズル上
部の円筒部2と、ノズル下部の偏平部1とで形成されて
おり、溶湯は円筒ノズル孔3を通過して偏平ノズル孔1
aに入る。ノズル孔の横断面が円筒形から偏平形に変化
することにより、円筒ノズル孔3で溶湯の流動抵抗が加
わって溶湯は注湯ノズル孔内を充満し、幅狭壁面の横向
き開口部4、幅広壁面の横向き開口部5及びスリット状
の下向き開口部9から湯溜り部11内に吐出される。The pouring nozzle 13 according to the present invention is formed by a cylindrical portion 2 at the upper portion of the nozzle and a flat portion 1 at the lower portion of the nozzle. Molten metal passes through the cylindrical nozzle hole 3 and the flat nozzle hole 1
Enter a. By changing the cross section of the nozzle hole from a cylindrical shape to a flat shape, the flow resistance of the molten metal is added at the cylindrical nozzle hole 3 so that the molten metal fills the inside of the pouring nozzle hole, and the lateral opening 4 of the narrow wall surface is widened. The liquid is discharged into the hot water pool 11 through the lateral opening 5 on the wall surface and the slit-shaped downward opening 9.
【0021】幅狭壁面の横向き開口部4の幅bとcの寸
法関係は、b>cである。すなわち幅狭壁面の横向き開
口部4は下狭まり状に形成されている。幅広壁面の横向
き開口部5は幅長の長方形である。The dimensional relationship between the widths b and c of the lateral opening 4 of the narrow wall surface is b> c. That is, the lateral opening 4 of the narrow wall surface is formed in a downward narrowed shape. The lateral opening 5 of the wide wall is a rectangular shape having a long width.
【0022】図2は、図1に示す注湯ノズル13のA−
A方向の縦断面図を示している。図2において、幅狭壁
面6と6は角度βで左右対称に形成されており、図1の
ように、幅狭壁面6及び6は下狭まり状である。FIG. 2 shows the pouring nozzle 13 shown in FIG.
The longitudinal sectional view of the A direction is shown. In FIG. 2, the narrow wall surfaces 6 and 6 are symmetrically formed at an angle β, and as shown in FIG. 1, the narrow wall surfaces 6 and 6 are narrowed downward.
【0023】幅広壁面7と7の下端部の間には、幅広壁
面同士を連結するように連結部8が設けてある。連結部
8は上尖り状の高さhの山形である。A connecting portion 8 is provided between the wide wall surfaces 7 and the lower end portion of the wall 7 to connect the wide wall surfaces to each other. The connecting portion 8 is a mountain shape having an upper pointed height h.
【0024】図3は、図1に示す注湯ノズルのB−B方
向の縦断面図を示している。図3において、冷却ドラム
10、10、湯溜り部11および鋳片12を併せて示し
ており、鋳造中の各々の位置関係を図示している。幅広
壁面7と7は角度αで左右対称に形成されており、図1
のように、幅広壁面7及び7は下広がり状である。FIG. 3 shows a vertical cross-sectional view of the pouring nozzle shown in FIG. 1 in the BB direction. In FIG. 3, the cooling drums 10, 10, the molten metal pool portion 11, and the cast piece 12 are also shown together, and the positional relationship between each of them during casting is shown. The wide wall surfaces 7 and 7 are formed symmetrically at an angle α, as shown in FIG.
As described above, the wide wall surfaces 7 and 7 are spread downward.
【0025】図4は、図2においてC−C方向から注湯
ノズル13の底面を見上げた平面図である。溶湯が通過
する空間は注湯ノズル上部の円筒部2では円形であった
が、偏平部1の下端においては細長い長方形にまで偏平
化されている。偏平ノズル孔下端のスリット状の下向き
開口部9は、幅狭壁面の横向き開口部4と繋がってい
る。その理由は、溶湯吐出流が最も到達し難い部分は、
ドラム両端部のドラム最近接点近傍であるから、そこに
向けて溶湯が吐出するように、その部分を切り欠き状と
することで流動抵抗を減らすためである。FIG. 4 is a plan view in which the bottom surface of the pouring nozzle 13 is looked up from the CC direction in FIG. The space through which the molten metal passes was circular in the cylindrical portion 2 above the pouring nozzle, but at the lower end of the flat portion 1 it was flattened into an elongated rectangle. The slit-shaped downward opening 9 at the lower end of the flat nozzle hole is connected to the lateral opening 4 of the narrow wall surface. The reason is that the part where the molten metal discharge flow is the most difficult to reach is
This is to reduce the flow resistance by forming notches so that the molten metal is discharged toward the drum closest contact points at both end portions of the drum so that the molten metal is discharged there.
【0026】なお特記すべき点は、幅狭壁面6が下狭ま
り状に形成され、幅広壁面7が下広がり状に形成されて
いるので、偏平ノズル孔1aは下方に向かうにしたがっ
て、連続的に偏平化しているので、偏平ノズル孔1a内
で、溶湯に圧損が加わって溶湯流動が均等乱流化し、湯
溜り部11の両端部に向かう流動方向が自動的に形成さ
れることに成るのである。その結果、例えばドラム幅が
1000mmの場合、従来ではノズル幅が800mmで
あったものが600mmと小型化できる。It should be noted that the narrow wall surface 6 is formed to be narrowed downward and the wide wall surface 7 is formed to be spread downward, so that the flat nozzle hole 1a continuously extends downward. Because of the flattening, the pressure loss is applied to the molten metal in the flattened nozzle hole 1a, the molten metal flow becomes a uniform turbulent flow, and the flow direction toward the both ends of the molten metal pool portion 11 is automatically formed. . As a result, for example, when the drum width is 1000 mm, the conventional nozzle width of 800 mm can be downsized to 600 mm.
【0027】さらに、スリット状の下向き開口部9は、
鋳片12の幅方向に細長いスリット状であるため、冷却
ドラム10の最近接点kpの近傍に向けて溶湯が直接的
かつ幅均等に供給されるので、この部分の低温溶鋼を攪
拌して排除ないし加熱することが可能となる。この効果
によって、従来発明による注湯ノズルでは安定的に達成
できなかった冷却ドラム最近接点kpでの凝固シェルの
張り合わせ不均一を解消することができる。Further, the slit-shaped downward opening 9 is
Since the slab 12 has a slit shape elongated in the width direction, the molten metal is directly and evenly supplied to the vicinity of the closest contact point kp of the cooling drum 10. Therefore, the low temperature molten steel in this portion is not stirred and eliminated. It becomes possible to heat. Due to this effect, it is possible to eliminate the uneven bonding of the solidified shells at the cooling drum nearest point kp, which could not be achieved stably by the pouring nozzle according to the conventional invention.
【0028】さらに、幅狭壁面の横向き開口部4および
幅広壁面の横向き開口部5からの溶湯の吐出によって、
湯溜り部11の表面で溶湯流動が遅滞することがないの
で、溶湯表面上での凝固物生成を防止することができ
る。Furthermore, the molten metal is discharged from the lateral opening 4 of the narrow wall and the lateral opening 5 of the wide wall,
Since the molten metal flow is not delayed on the surface of the molten metal pool 11, it is possible to prevent the formation of a solidified product on the surface of the molten metal.
【0029】ところで、注湯ノズルの各開口部のa〜h
の数値については、実際的には冷却ドラム10の寸法や
鋳片12の板厚ないし鋳造速度に基づく溶湯スループッ
ト量により最適化させる必要があるが,湯溜り部11内
の溶湯の流動パターンは、例えば数値解析や水モデルに
よる流動シミュレーション実験によって適宜求めること
ができる。また、αおよびβの値については、一般的な
薄帯鋳片を鋳造する場合、αを15°〜35°、βを9
0°〜140°の範囲に設定することが望ましいが、前
記の溶融スループット量によってはこの限りでない。し
かしながら、これらをいかに設定せよ、従来発明による
注湯ノズルに較べて製作コストを大幅に削減できる。By the way, a to h of each opening of the pouring nozzle
Regarding the numerical value of, it is necessary to be practically optimized by the molten metal throughput amount based on the dimensions of the cooling drum 10 and the plate thickness of the slab 12 or the casting speed. However, the flow pattern of the molten metal in the pool 11 is For example, it can be appropriately calculated by numerical analysis or a flow simulation experiment using a water model. Regarding the values of α and β, α is 15 ° to 35 ° and β is 9 when casting a general strip casting.
It is desirable to set in the range of 0 ° to 140 °, but it is not limited to this depending on the melting throughput amount. However, no matter how these are set, the manufacturing cost can be significantly reduced as compared with the pouring nozzle according to the conventional invention.
【0030】[0030]
【発明の効果】以上述べた通り、本発明の注湯ノズルに
より、湯溜り部内の溶湯温度を全体的に均一化させて溶
湯表面上での凝固物の発生を防止しつつ、凝固シェル生
成の安定化と均一化を図ることができ、小型で簡便であ
りかつ安価な注湯ノズルを提供することが可能となる。As described above, with the pouring nozzle of the present invention, the temperature of the molten metal in the molten metal pool is made uniform throughout and the formation of solidified shells is prevented while preventing the formation of solidified matter on the surface of the molten metal. It is possible to provide a compact, simple, and inexpensive pouring nozzle that can be stabilized and made uniform.
【図1】本発明の実施例を示す注湯ノズルの外観斜視図
である。FIG. 1 is an external perspective view of a pouring nozzle showing an embodiment of the present invention.
【図2】図1のA−A方向の縦断面図である。FIG. 2 is a vertical sectional view taken along the line AA of FIG.
【図3】図1のB−B方向の縦断面図である。3 is a vertical cross-sectional view taken along the line BB of FIG.
【図4】図2のC−C方向の平面図である。FIG. 4 is a plan view in the CC direction of FIG.
1…偏平部 1a…偏平ノズル孔 2…円筒部 3…円筒ノズル孔 4…幅狭壁面の横向き開口部 5…幅広壁面の横向き開口部 6…幅狭壁面 7…幅広壁面 8…幅広壁面の連結部 9…スリット状の下向き開口部 10…冷却ドラム 11…湯溜り部 12…鋳片 13…本発明の注湯ノズル α…幅広壁面同士がなす角度 β…幅狭壁面同士がなす角度 a…幅狭壁面の横向き開口部の高さ b…幅狭壁面の横向き開口部上辺の幅 c…幅狭壁面の横向き開口部下辺の幅 d…幅広壁面の横向き開口部の高さ e…幅広壁面の横向き開口部の幅 f…下部スリット状開口部の幅広壁面に平行する長さ g…連結部の幅広壁面に平行する長さ h…連結部の高さ kp…冷却ドラム最近接点 1 ... Flat part 1a ... Flat nozzle hole 2 ... Cylindrical part 3 ... Cylindrical nozzle hole 4 ... Sideways opening of narrow wall 5 ... Lateral opening of wide wall 6 ... narrow wall 7 ... Wide wall 8 ... Wide wall connection 9 ... Slit-shaped downward opening 10 ... Cooling drum 11 ... Hot water pool 12 ... Slab 13 ... Pouring nozzle of the present invention α: the angle between the wide walls β: Angle between narrow walls a: Height of sideways opening of narrow wall b: Width of the upper side of the sideways opening of the narrow wall c: width of the lower side of the sideways opening of the narrow wall d: Height of sideways opening on wide wall e ... Width of the lateral opening on the wide wall f: Length parallel to the wide wall of the lower slit-shaped opening g: Length parallel to the wide wall of the connecting part h ... Height of connecting part kp ... Cooling drum closest point
フロントページの続き (72)発明者 竹内 友英 光市大字島田3434番地 新日本製鐵株式会 社光製鐵所内 (72)発明者 小林 英明 光市大字島田3434番地 新日本製鐵株式会 社光製鐵所内 (72)発明者 恒成 敬二 富津市新富20−1 新日本製鐵株式会社技 術開発本部内 (72)発明者 山村 英明 富津市新富20−1 新日本製鐵株式会社技 術開発本部内 (72)発明者 藤 健彦 富津市新富20−1 新日本製鐵株式会社技 術開発本部内 Fターム(参考) 4E004 DA13 FA01 FB02 FB04 FB06 NA05 NB07 SA02 Continued front page (72) Inventor Tomohide Takeuchi 3434 Shimada, Hikari-shi, Nippon Steel Works Inside the Shoko Ironworks (72) Inventor Hideaki Kobayashi 3434 Shimada, Hikari-shi, Nippon Steel Works Inside the Shoko Ironworks (72) Inventor Keiji Tsusunari 20-1 Shintomi, Futtsu City Nippon Steel Co., Ltd. Inside the surgical development headquarters (72) Inventor Hideaki Yamamura 20-1 Shintomi, Futtsu City Nippon Steel Co., Ltd. Inside the surgical development headquarters (72) Inventor Takehiko Fuji 20-1 Shintomi, Futtsu City Nippon Steel Co., Ltd. Inside the surgical development headquarters F-term (reference) 4E004 DA13 FA01 FB02 FB04 FB06 NA05 NB07 SA02
Claims (8)
平状である偏平ノズル孔を下部に有する注湯ノズルであ
って、該偏平ノズル孔の幅狭壁面に横向き開口部と、該
偏平注湯ノズル孔の下端にスリット状の下向き開口部と
を有することを特徴とする薄帯鋳片鋳造用注湯ノズル。1. A pouring nozzle having a flat nozzle hole in a lower portion of which a horizontal cross-sectional shape of a space through which the molten metal passes is flat, wherein a lateral opening portion is formed on a narrow wall surface of the flat nozzle hole and the flat pouring nozzle. A pouring nozzle for casting thin strip slabs, which has a slit-shaped downward opening at the lower end of the hot water nozzle hole.
々の形状は下狭まり状であり、かつ対向する幅広壁面各
々の形状は下広がり状であることを特徴とする請求項1
に記載の薄帯鋳片鋳造用注湯ノズル。2. The shape of each of the facing narrow wall surfaces of the flat nozzle hole is downwardly narrowed, and the shape of each of the facing wide wall surfaces is downwardly widened.
A pouring nozzle for casting a thin strip slab as described in.
あることを特徴とする請求項1又は2に記載の薄帯鋳片
鋳造用注湯ノズル。3. The pouring nozzle for casting a thin strip cast product according to claim 1, wherein the lateral opening of the narrow wall has a vertically long shape.
状であることを特徴とする請求項3に記載の薄帯鋳片鋳
造用注湯ノズル。4. The pouring nozzle for casting a thin strip cast product according to claim 3, wherein the lateral opening portion of the narrow wall surface is narrowed downward.
口部を有することを特徴とする請求項1乃至4の何れか
に記載の鋳片鋳造用注湯ノズル。5. The casting nozzle for casting slab according to claim 1, wherein the flat nozzle hole has a lateral opening on a wide wall surface.
あることを特徴とする請求項5に記載の薄帯鋳片鋳造用
注湯ノズル。6. The pouring nozzle for casting thin strip cast slabs according to claim 5, wherein the lateral opening of the wide wall has a horizontally long shape.
壁面同士を連結した連結部を有することを特徴とする請
求項1乃至6の何れかに記載の薄帯鋳片鋳造用注湯ノズ
ル。7. The pouring nozzle for casting strip cast slabs according to claim 1, further comprising a connecting portion that connects wide wall surfaces facing each other at a lower end of the flat nozzle hole.
一対の傾斜面で形成された山型状であることを特徴とす
る請求項7に記載の薄帯鋳片鋳造用注湯ノズル。8. The pouring nozzle for casting thin strip slabs according to claim 7, wherein the upper surface of the connecting portion has a mountain shape formed by a pair of inclined surfaces when viewed from the side of the wide wall surface. .
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001387829A JP2003181603A (en) | 2001-12-20 | 2001-12-20 | Pouring nozzle for casting thin strip-like slab |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001387829A JP2003181603A (en) | 2001-12-20 | 2001-12-20 | Pouring nozzle for casting thin strip-like slab |
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JP2003181603A true JP2003181603A (en) | 2003-07-02 |
Family
ID=27596541
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JP2001387829A Withdrawn JP2003181603A (en) | 2001-12-20 | 2001-12-20 | Pouring nozzle for casting thin strip-like slab |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005077570A1 (en) * | 2004-02-17 | 2005-08-25 | Castrip, Llc | A method and apparatus for continuously casting steel strip |
KR100805043B1 (en) | 2006-12-19 | 2008-02-20 | 주식회사 포스코 | Submerged nozzle for continuous casting |
US20190232364A1 (en) * | 2018-01-26 | 2019-08-01 | Ak Steel Properties, Inc. | Submerged entry nozzle for continuous casting |
JP2020146690A (en) * | 2019-03-11 | 2020-09-17 | 日本製鉄株式会社 | Molten metal pouring nozzle, twin roll type continuous casting device, and method for producing thin slab |
JP7460897B2 (en) | 2020-04-03 | 2024-04-03 | 日本製鉄株式会社 | Twin roll continuous casting equipment and twin roll continuous casting method |
-
2001
- 2001-12-20 JP JP2001387829A patent/JP2003181603A/en not_active Withdrawn
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005077570A1 (en) * | 2004-02-17 | 2005-08-25 | Castrip, Llc | A method and apparatus for continuously casting steel strip |
KR100805043B1 (en) | 2006-12-19 | 2008-02-20 | 주식회사 포스코 | Submerged nozzle for continuous casting |
US20190232364A1 (en) * | 2018-01-26 | 2019-08-01 | Ak Steel Properties, Inc. | Submerged entry nozzle for continuous casting |
CN111655399A (en) * | 2018-01-26 | 2020-09-11 | Ak钢铁产权公司 | Submerged entry nozzle for continuous casting |
JP2021511215A (en) * | 2018-01-26 | 2021-05-06 | エーケー スティール プロパティ−ズ、インク. | Immersion inlet nozzle for continuous casting |
US11052459B2 (en) * | 2018-01-26 | 2021-07-06 | Cleveland-Cliffs Steel Properties Inc. | Submerged entry nozzle for continuous casting |
CN111655399B (en) * | 2018-01-26 | 2022-12-09 | Ak钢铁产权公司 | Submerged entry nozzle for continuous casting |
JP2020146690A (en) * | 2019-03-11 | 2020-09-17 | 日本製鉄株式会社 | Molten metal pouring nozzle, twin roll type continuous casting device, and method for producing thin slab |
JP7230597B2 (en) | 2019-03-11 | 2023-03-01 | 日本製鉄株式会社 | Pouring nozzle, twin roll type continuous casting apparatus, and method for producing thin cast slab |
JP7460897B2 (en) | 2020-04-03 | 2024-04-03 | 日本製鉄株式会社 | Twin roll continuous casting equipment and twin roll continuous casting method |
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