JP2012115857A - Twin roll type continuous casting machine and twin-roll type continuous casting method - Google Patents

Twin roll type continuous casting machine and twin-roll type continuous casting method Download PDF

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JP2012115857A
JP2012115857A JP2010266085A JP2010266085A JP2012115857A JP 2012115857 A JP2012115857 A JP 2012115857A JP 2010266085 A JP2010266085 A JP 2010266085A JP 2010266085 A JP2010266085 A JP 2010266085A JP 2012115857 A JP2012115857 A JP 2012115857A
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roll
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molten steel
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JP5480787B2 (en
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Yoshimi Kagehira
喜美 影平
Tsutomu Kawamizu
努 川水
Masahiro Sugihara
正浩 杉原
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Primetals Technologies Holdings Ltd
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Mitsubishi Hitachi Metals Machinery Inc
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Abstract

PROBLEM TO BE SOLVED: To avoid the occurrence of BO (breakout) to carry out stable casting in a twin roll type continuous casting machine carrying out casting in a state of winding a cast slab around one roll.SOLUTION: In the twin roll type continuous casting machine 10, the cast slab casted by supplying molten steel between the peripheral surfaces of a pair of rolls 11a and 11b rotated in reverse directions to each other and pressure-contacting a solidified shell solidified on the peripheral surfaces of the rolls in a gap 15 between the rolls is continuously drawn out from the gap between the rolls. At least one of the pair of the rolls is formed to be recessed rolls 11a, 11b so that the solidified shell is pressure-contacted in the double-leaved state, and a distal end of a pouring nozzle 12 for supplying the molten steel between the peripheral surfaces of the pair of the rolls can be inserted close to a neutral point KP of the roll as much as possible.

Description

本発明は、双ロール式連続鋳造機及び双ロール式連続鋳造方法に関する。   The present invention relates to a twin roll type continuous casting machine and a twin roll type continuous casting method.

この種の双ロール式連続鋳造機として、例えば図10に示すようなものが良く知られている。これは、一対の逆方向に回転するロール100a,100bを、同じ高さ位置にて平行にしつつ近接して配置しており、ロール100a,100bの軸方向両端は、ロール端面に密着するサイド堰101a,101bにより仕切っている。そして、ロール100a,100b及びサイド堰101a,101bでなる移動鋳型の内部空間(湯溜まり部)には、注湯ノズル102を介して溶綱103が供給される。   As this type of twin roll type continuous casting machine, for example, the one shown in FIG. 10 is well known. In this, a pair of rolls 100a and 100b rotating in opposite directions are arranged close to each other in parallel at the same height position, and both ends in the axial direction of the rolls 100a and 100b are side weirs that are in close contact with the roll end surface. It is partitioned by 101a and 101b. And the molten metal 103 is supplied through the pouring nozzle 102 to the internal space (hot water reservoir) of the moving mold formed by the rolls 100a and 100b and the side weirs 101a and 101b.

従って、ロール100a,100bが逆方向に回転すると(溶綱103を下方に巻き込むように回転すると)、溶綱103はロール100a,100bの周面に順次接触して冷却され、その結果、ロール100a,100bの周面にそれぞれ凝固シェルが形成される。この双方の凝固シェルはロール回転に伴い徐々に成長し、ロール100a,100bの最小ギャップ部にて圧接・一体化された、または双方の凝固シェル間に未凝固部を残存した鋳片104として取り出される(特許文献1等参照)。   Therefore, when the rolls 100a and 100b rotate in the opposite direction (when the roll 103 is rotated so as to be wound downward), the melt 103 is sequentially brought into contact with the peripheral surfaces of the rolls 100a and 100b and cooled, and as a result, the roll 100a. , 100b, solidified shells are respectively formed on the peripheral surfaces. Both the solidified shells gradually grow with the rotation of the roll, and are taken out as a cast piece 104 which is pressed and integrated at the minimum gap portion of the rolls 100a and 100b, or where an unsolidified portion remains between both solidified shells. (See Patent Document 1).

特開2006−175488号公報JP 2006-175488 A 特開昭61−219449号公報Japanese Patent Laid-Open No. 61-219449 特開昭09−164457号公報JP 09-164457 A 特開昭62−134148号公報Japanese Patent Laid-Open No. 62-134148

ところで、前述したような双ロール式連続鋳造機で鋳造する場合、初期注湯時に注湯ノズルからの吐出流の勢いが強いと溶鋼が飛散しロールの周面に付着する。付着した溶鋼は凝固を阻害し、付着部分には二重肌が生じ鋳片性状が悪化する。この勢いを弱めるために吐出流量を絞ったとしても、ノズル吐出口が高い位置にあるとそこからの落下速度だけでも溶鋼を飛散させてしまう。従って、できるだけ低い位置、例えばロールの中立点(通称KP:Kissing Pointと言う)に近い位置からゆっくりと吐出させる必要があるという第1の課題がある。   By the way, when casting with the twin roll type continuous casting machine as described above, if the momentum of the discharge flow from the pouring nozzle is strong at the time of initial pouring, the molten steel scatters and adheres to the peripheral surface of the roll. The adhering molten steel inhibits solidification, and double skin occurs at the adhering portion, and the slab properties deteriorate. Even if the discharge flow rate is reduced in order to weaken this momentum, if the nozzle discharge port is at a high position, the molten steel will be scattered only by the dropping speed from there. Therefore, there is a first problem that it is necessary to discharge slowly from a position as low as possible, for example, a position close to the neutral point of the roll (commonly referred to as KP: Kissing Point).

また、シェル厚の生成は溶鋼の流れに影響されるため、シェル厚を均一に生成させるには注湯ノズルから幅方向(ロール軸方向)に均一な流れを生じさせる必要があるという第2の課題がある。   In addition, since the generation of the shell thickness is affected by the flow of the molten steel, in order to generate the shell thickness uniformly, it is necessary to generate a uniform flow in the width direction (roll axis direction) from the pouring nozzle. There are challenges.

そこで、従来、注湯開始時の非定常時に凝固シェルの生成阻害を防ぎ溶湯の流動を抑える方法として、特許文献2において、注湯ノズルの先端を極力ロールの中立点(KP)に近づけた状態で注湯を開始し、一定の浸漬深さを保持しながら該ノズルを所定レベル位置まで上昇させる鋳造方法が開示されているが、この鋳造方法では、単なる円形ロールではノズル先端自体の厚みによりロールの中立点(KP)に近づけるのに自ずと限度があり前述した第1の課題を十分に解決することができないと共に、第2の課題を解決する手段は一切開示されていないという問題点があった。   Therefore, conventionally, as a method of preventing the formation of solidified shells and suppressing the flow of the molten metal at the unsteady time when pouring starts, in Patent Document 2, the tip of the pouring nozzle is as close as possible to the neutral point (KP) of the roll. A casting method is disclosed in which hot water injection is started and the nozzle is raised to a predetermined level position while maintaining a constant immersion depth. There is a limit to approaching the neutral point (KP), and the first problem described above cannot be sufficiently solved, and no means for solving the second problem has been disclosed. .

また、シェル厚を均一にすべく溶鋼流の流れが均一になるための溶湯の流れを制御する方法として、内部に整流用内装物を有するノズルを用いた鋳造方法が特許文献3で開示され、タンディッシュからオーバーフローさせた落下流を複数の溝で分散流とする注湯方法が特許文献4で開示されている。   Moreover, as a method for controlling the flow of the molten metal to make the flow of the molten steel uniform so as to make the shell thickness uniform, a casting method using a nozzle having a rectifying interior is disclosed in Patent Document 3, Patent Document 4 discloses a pouring method in which a falling flow overflowed from a tundish is dispersed in a plurality of grooves.

しかしながら、特許文献3で開示された鋳造方法では、図11に示すように、注湯ノズル200における浸漬ノズル(外ノズル)200a内の底部に仕切り部201aと複数の貫通孔201bを有した整流用内装物201を設け、貫通孔201bの直径は5〜12mmが望ましいとしているため、注湯ノズル200(浸漬ノズル200a)の先端部はある程度の厚みを有することになる。尚、図11中200bは注湯ノズル200における注湯用ノズル(内ノズル)で、202a,202bは一対のロールである。   However, in the casting method disclosed in Patent Document 3, as shown in FIG. 11, for pouring, the pouring nozzle 200 has a partition part 201 a and a plurality of through holes 201 b at the bottom part in the immersion nozzle (outer nozzle) 200 a. Since the interior item 201 is provided and the diameter of the through hole 201b is preferably 5 to 12 mm, the tip of the pouring nozzle 200 (immersion nozzle 200a) has a certain thickness. In FIG. 11, 200b is a pouring nozzle (inner nozzle) in the pouring nozzle 200, and 202a and 202b are a pair of rolls.

従って、特許文献2で開示された鋳造方法のように、ノズル先端をできるだけロールの中立点(KP)に近づけようとすると、ロールの中立点(KP)に近づけば近づく程ロール間の隙間が狭くなるので、ここに特許文献3で開示された注湯ノズル200(浸漬ノズル200a)を用いようとすると、ロール202a,202bの中立点(KP)に到底近づけ難く、第1の課題を解決することができないという問題点があった。   Therefore, as in the casting method disclosed in Patent Document 2, when the nozzle tip is made as close as possible to the neutral point (KP) of the roll, the gap between the rolls becomes narrower as it approaches the neutral point (KP) of the roll. Therefore, if the pouring nozzle 200 (immersion nozzle 200a) disclosed in Patent Document 3 is used here, it is difficult to get close to the neutral point (KP) of the rolls 202a and 202b, and the first problem is solved. There was a problem that could not.

即ち、特許文献3における貫通孔201bの直径:平均の8mm、中央の仕切り部201aの厚み:10mm、貫通孔201b−ノズル内壁間の距離:10mm、外ノズル200aの厚み:10mmとすると、ノズル先端での厚みは10+2×8+2×10+2×10=66mmとなり、特許文献2のロールを用いて、このノズルからドラム表面まで5mmの隙間を確保できる位置を求めると次のようになる(ロール径R=1000mm,ドラム間の隙間=0mm)。
66/2+5=R(1−cosθ)、H=Rsinθ、R=1000により、
ロールの中立点(KP)からの高さHは2730mmとなるのである。
That is, when the diameter of the through hole 201b in Patent Document 3 is 8 mm on average, the thickness of the central partition part 201a is 10 mm, the distance between the through hole 201b and the inner wall of the nozzle is 10 mm, and the thickness of the outer nozzle 200a is 10 mm, the tip of the nozzle The thickness at is 10 + 2 × 8 + 2 × 10 + 2 × 10 = 66 mm. Using the roll of Patent Document 2, the position where a 5 mm gap can be secured from the nozzle to the drum surface is as follows (roll diameter R = 1000 mm, gap between drums = 0 mm).
66/2 + 5 = R (1-cos θ), H = R sin θ, R = 1000,
The height H from the neutral point (KP) of the roll is 2730 mm.

さらに、特許文献3で開示された注湯ノズル200(浸漬ノズル200a)では貫通孔201bを用いており、貫通孔201b部では流路が幅方向に分断されているために、分断箇所と貫通孔201bの箇所での流れが異なり、幅方向の流速分布を均一化するという第2の課題も解決することができないという欠点があった。   Further, the pouring nozzle 200 (immersion nozzle 200a) disclosed in Patent Document 3 uses the through hole 201b, and the flow path is divided in the width direction in the through hole 201b portion. There is a drawback that the second problem of making the flow velocity distribution in the width direction uniform and the flow at the portion 201b cannot be solved.

また、特許文献4で開示された注湯方法では、ノズル内部に堰を設けて縦溝に区切り分散流とすることが述べられているが、実施例では溝幅60mm、溝ピッチ100mmとあり、従って堰の幅は40mmとなる。しかしこれだと堰の部分では吐出流が全く発生せず、流れは幅方向で均一にはならない。例え実施例より溝ピッチを狭めたとしても、堰の部分からは吐出流が生じないので、堰の部分と隣の溝の部分で流れは異なり幅方向に均一にするのが困難であり、前述した第1の課題はもとより第2の課題も十分に解決することができないという問題点があった。   In addition, in the pouring method disclosed in Patent Document 4, it is stated that weirs are provided inside the nozzles and separated into vertical grooves to form a dispersed flow, but in the examples, the groove width is 60 mm and the groove pitch is 100 mm. Therefore, the width of the weir is 40 mm. However, in this case, no discharge flow is generated at the weir and the flow is not uniform in the width direction. Even if the groove pitch is narrower than in the embodiment, since no discharge flow is generated from the weir part, the flow is different between the weir part and the adjacent groove part, and it is difficult to make it uniform in the width direction. The first problem as well as the second problem cannot be solved sufficiently.

そこで、本発明の目的は、ノズル先端を可及的にロールの中立点(KP)に近づけることと幅方向に均一な溶鋼流れを生成することを可能にして鋳片性状のより一層の向上が図れる双ロール式連続鋳造機及び双ロール式連続鋳造方法を提供することにある。   Therefore, an object of the present invention is to make the tip of the nozzle as close as possible to the neutral point (KP) of the roll and to generate a uniform molten steel flow in the width direction, thereby further improving the slab properties. An object is to provide a twin roll type continuous casting machine and a twin roll type continuous casting method.

前記目的を達成するための本発明に係る双ロール式連続鋳造機は、
(1)互いに逆方向に回転する一対のロールの周面間に溶鋼を供給し、各ロールの周面で凝固した凝固シェルを各ロール間の隙間で圧接して鋳造した鋳片を、各ロール間の隙間から連続して引き出す双ロール式連続鋳造機において、
前記凝固シェルを袋綴じ状に圧接すべく前記一対のロールの少なくとも一方を凹型ロールに形成し、前記一対のロールの周面間に溶鋼を供給する注湯ノズルの先端をロールの中立点に可及的に近づけて挿入可能とした、
ことを特徴とする。
In order to achieve the above object, a twin roll type continuous casting machine according to the present invention comprises:
(1) Molten steel is supplied between the peripheral surfaces of a pair of rolls rotating in opposite directions, and a slab casted by pressing a solidified shell solidified on the peripheral surface of each roll with a gap between the rolls. In the twin roll type continuous casting machine that pulls out continuously from the gap between
At least one of the pair of rolls is formed in a concave roll so that the solidified shell is pressed into a bag-like shape, and the tip of a pouring nozzle that supplies molten steel between the peripheral surfaces of the pair of rolls can be used as a neutral point of the roll. It was possible to insert as close as possible,
It is characterized by that.

また、
(2)前記注湯ノズルの内部に、湯流れを分散する整流板を有すると共に該整流板の下方に分散した湯流れを保持する溝状の湯流れ捕捉部を設けたことを特徴とする。
Also,
(2) The present invention is characterized in that a grooved hot water flow capturing portion for holding a hot water flow dispersed under the flow straightening plate is provided inside the hot water pouring nozzle.

(3)互いに逆方向に回転する一対のロールの周面間に溶鋼を供給し、各ロールの周面で凝固した凝固シェルを各ロール間の隙間で圧接して鋳造した鋳片を、各ロール間の隙間から連続して引き出す双ロール式連続鋳造機において、
前記一対のロールの周面間に溶鋼を供給する注湯ノズルの内部に、湯流れを分散する整流板を有すると共に該整流板の下方に分散した湯流れを保持する溝状の湯流れ捕捉部を設けたことを特徴とする。
(3) Molten steel is supplied between the peripheral surfaces of a pair of rolls rotating in opposite directions, and a cast piece cast by pressing a solidified shell solidified on the peripheral surface of each roll with a gap between the rolls, In the twin roll type continuous casting machine that pulls out continuously from the gap between
A grooved hot water flow catching portion having a flow straightening plate for dispersing the hot water flow inside the pouring nozzle for supplying molten steel between the peripheral surfaces of the pair of rolls and holding the hot water flow dispersed below the flow straightening plate. Is provided.

前記目的を達成するための本発明に係る双ロール式連続鋳造方法は、
(4)前記(1),(2)又は(3)の双ロール式連続鋳造機を用いた連続鋳造方法において、
注湯ノズルの先端をロールの中立点に可及的に近づけた状態で注湯を開始し、その後注湯ノズルの先端を溶鋼内に浸漬させたまま注湯ノズルを上昇させる、
ことを特徴とする。
In order to achieve the above object, a twin-roll continuous casting method according to the present invention comprises:
(4) In the continuous casting method using the twin roll type continuous casting machine of (1), (2) or (3),
Start pouring with the tip of the pouring nozzle as close as possible to the neutral point of the roll, and then raise the pouring nozzle while the tip of the pouring nozzle is immersed in the molten steel.
It is characterized by that.

また、
(5)前記注湯開始時に溶鋼の供給流量を絞り、注湯ノズルの先端が溶鋼内に浸漬した後に供給流量を増やすことを特徴とする。
Also,
(5) The supply flow rate of the molten steel is reduced at the start of the pouring, and the supply flow rate is increased after the end of the pouring nozzle is immersed in the molten steel.

前記(1)の発明によれば、凹型ロールによりロールの周面間に必ず隙間を確保することができるので、ロール径が大きくなっても注湯ノズルの先端を確実にロールの中立点(KP)に近づけられ、溶鋼の飛散が抑制されて鋳片性状の向上が図れる。   According to the invention of (1), since the gap can be ensured between the peripheral surfaces of the roll by the concave roll, the tip of the pouring nozzle can be reliably connected to the neutral point (KP) of the roll even when the roll diameter is increased. ), The scattering of molten steel is suppressed, and the slab properties can be improved.

前記(2)の発明によれば、(1)の作用効果に加えて、ノズル先端の薄肉化によりその先端を可及的にロールの中立点(KP)に近づけて溶鋼の飛散を抑制できると共に、整流板及び湯流れ捕捉部により溶鋼の均一な流れを確保して鋳片性状のより一層の向上が図れる。   According to the invention of (2), in addition to the effect of (1), the tip of the nozzle can be made as close as possible to the neutral point (KP) of the roll by reducing the thickness of the nozzle, and the scattering of molten steel can be suppressed. Further, the flow of the molten steel can be ensured by the flow straightening plate and the molten metal flow capturing portion, and the slab properties can be further improved.

前記(3)の発明によれば、ノズル先端の薄肉化によりその先端を可及的にロールの中立点(KP)に近づけて溶鋼の飛散を抑制できると共に、整流板及び湯流れ捕捉部により溶鋼の均一な流れを確保して鋳片性状の向上が図れる。   According to the invention of (3), the nozzle tip can be made as close as possible to the neutral point (KP) of the roll by reducing the thickness of the nozzle tip, and the splash of molten steel can be suppressed. This ensures a uniform flow of the slab and improves the slab properties.

前記(4)の発明によれば、吐出流によるシェル湯洗いによりシェルの生成が阻害されることが回避されると共に、吐出流が湯面に当たって溶鋼が飛散するのが回避され、鋳片性状の向上が図れる。   According to the invention of the above (4), it is avoided that the formation of the shell is inhibited by the shell hot water washing by the discharge flow, and it is avoided that the molten steel is scattered by the discharge flow hitting the molten metal surface. Improvement can be achieved.

前記(5)の発明によれば、注湯初期の溶鋼飛散を効果的に抑制しつつ早期に必要流量を確保でき、注湯流による凝固シェルの薄肉化が防止できる。   According to the invention of (5), the required flow rate can be secured at an early stage while effectively suppressing molten steel scattering in the initial stage of pouring, and the thinning of the solidified shell due to the pouring flow can be prevented.

本発明の実施例1を示す双ロール式連続鋳造機の要部正面図である。It is a principal part front view of the twin roll type continuous casting machine which shows Example 1 of this invention. 同じく平面図である。It is also a plan view. 同じく注湯ノズルの変形例を示す双ロール式連続鋳造機の要部正面図である。It is a principal part front view of the twin roll type continuous casting machine which similarly shows the modification of a pouring nozzle. 本発明の実施例2を示す双ロール式連続鋳造機の要部正面図である。It is a principal part front view of the twin roll type continuous casting machine which shows Example 2 of this invention. 同じく注湯ノズルの説明図で、同図(a)は正断面図、同図(b)は側断面図、同図(c)は同図(a)のA−A線断面図である。FIG. 4A is an explanatory view of a pouring nozzle, in which FIG. 1A is a front sectional view, FIG. 2B is a side sectional view, and FIG. 1C is a sectional view taken along line AA of FIG. ノズル幅方向の流速分布の比較を示すグラフである。It is a graph which shows the comparison of the flow velocity distribution of a nozzle width direction. 本発明の実施例3を示す注湯ノズルの作用説明図である。It is action | operation explanatory drawing of the pouring nozzle which shows Example 3 of this invention. 注湯流量の制御フローである。It is a control flow of the pouring flow rate. 凹型ロールの各種例を示す説明図である。It is explanatory drawing which shows the various examples of a concave roll. 従来の双ロール式連続鋳造機の要部斜視図である。It is a principal part perspective view of the conventional twin roll type continuous casting machine. 整流用内装物付き注湯ノズルを用いた従来の双ロール式連続鋳造機の要部正面図である。It is a principal part front view of the conventional twin roll type continuous casting machine using the pouring nozzle with the rectifying interior.

以下、本発明に係る双ロール式連続鋳造機及び双ロール式連続鋳造方法を実施例により図面を用いて詳細に説明する。   Hereinafter, a twin roll type continuous casting machine and a twin roll type continuous casting method according to the present invention will be described in detail with reference to the accompanying drawings.

図1は本発明の実施例1を示す双ロール式連続鋳造機の要部正面図、図2は同じく平面図、図3は同じく注湯ノズルの変形例を示す双ロール式連続鋳造機の要部正面図、図9は凹型ロールの各種例を示す説明図である。   FIG. 1 is a front view of a main part of a twin-roll continuous casting machine showing Embodiment 1 of the present invention, FIG. 2 is a plan view of the same, and FIG. FIG. 9 is an explanatory view showing various examples of concave rolls.

図1及び図2に示すように、本実施例の双ロール式連続鋳造機10は、一対の逆方向に回転するロール11a,11bを近接して配置しており、これらのロール11a,11bの軸方向両端は、ロール端面に密着する図示しないサイド堰により仕切られている。   As shown in FIGS. 1 and 2, the twin roll type continuous casting machine 10 of the present embodiment has a pair of rolls 11a and 11b that rotate in opposite directions close to each other. Both ends in the axial direction are partitioned by side dams (not shown) that are in close contact with the roll end faces.

そして、各ロール11a,11bの回転下で、各ロール11a,11b及びサイド堰により囲まれて形成された内部空間(湯溜まり部)には、注湯ノズル12を介して溶鋼が供給され、各ロール11a,11bの周面で凝固した凝固シェルを各ロールロール11a,11b間の隙間で圧接して鋳造した鋳片を、各ロール11a,11b間の隙間から連続して引き出すようになっている。注湯ノズル12は筒状の注湯ノズル部12aとスリット状の吐出口12cを有した扁平な筐体状の浸漬ノズル部12bとからなる。   And under rotation of each roll 11a, 11b, molten steel is supplied via the pouring nozzle 12 to the internal space (hot water pool part) formed surrounded by each roll 11a, 11b and the side weir, The slab casted by pressing the solidified shell solidified on the peripheral surfaces of the rolls 11a and 11b in the gaps between the rolls 11a and 11b is continuously drawn out from the gaps between the rolls 11a and 11b. . The pouring nozzle 12 includes a cylindrical pouring nozzle portion 12a and a flat casing-shaped immersion nozzle portion 12b having a slit-like discharge port 12c.

また、前記凝固シェルを袋綴じ状に圧接すべく前記一対のロール11a,11bの少なくとも一方(図示例では両方)を凹型ロールに形成し、前記一対のロール11a,11bの周面間に溶鋼を供給する注湯ノズル12の先端をロールの中立点(KP)に可及的に近づけて挿入可能になっている。   Further, at least one of the pair of rolls 11a and 11b (both in the illustrated example) is formed in a concave roll so as to press the solidified shell into a bag-like shape, and molten steel is placed between the peripheral surfaces of the pair of rolls 11a and 11b. The tip of the pouring nozzle 12 to be supplied can be inserted as close as possible to the neutral point (KP) of the roll.

即ち、凹型ロール11a,11bにおいては、ロールの胴部13の径と端部14の径との径差分必ず隙間(袋状空間)15が確保でき、この隙間15内に注湯ノズル12の先端を挿入する、即ち、ノズル幅を隙間15に納まる寸法に設定することで、当該ノズル先端をロールの中立点(KP)に可及的に近づけられるのである。   That is, in the concave rolls 11a and 11b, a gap (bag-like space) 15 between the diameter of the roll body 13 and the diameter of the end 14 can always be secured, and the tip of the pouring nozzle 12 is placed in the gap 15. Is inserted, that is, the nozzle width is set to a dimension that fits in the gap 15, so that the nozzle tip can be brought as close as possible to the neutral point (KP) of the roll.

尚、「凹型ロール」とは、「ロールの軸方向に沿う両端の径が、ロールの中央部分の径よりも大きくなっているロール」と定義することができ、例えば、凹型ロール11a,11bとしては、図9の(a)に示すように、胴部13の両端に胴部径より大径の端部14を有するものや、図9の(b)に示すように、胴部13の両端がテーパー状に拡がってから端部14を有するもの、あるいは図9の(c)に示すように、胴部13の両端に端部14を有すると共に胴部13は軸方向の中央に向かうに従い径が漸減する鼓状になっているものなど、各種形状のロールが考えられる。   The “concave roll” can be defined as “a roll in which the diameters of both ends along the axial direction of the roll are larger than the diameter of the central portion of the roll”, for example, as the concave rolls 11a and 11b. FIG. 9 (a) shows an end portion 14 having a diameter larger than the diameter of the body portion at both ends of the body portion 13, and both ends of the body portion 13 as shown in FIG. 9 (b). 9 having an end 14 after expanding into a taper shape, or as shown in FIG. 9C, the body 13 has ends 14 at both ends, and the body 13 has a diameter toward the center in the axial direction. Various shapes of rolls are possible, such as a drum shape with gradually decreasing diameter.

このように構成されるため、鋳造ロールに凹型ロール11a,11bを用いたことにより、ロール11a,11bの周面間に必ず隙間15を確保することができるので、注湯ノズル12(浸漬ノズル部12b)の先端をロールの中立点(KP)に可及的に近づけられる。   Since the concave rolls 11a and 11b are used as the casting rolls, the gap 15 can always be secured between the peripheral surfaces of the rolls 11a and 11b. The tip of 12b) can be brought as close as possible to the neutral point (KP) of the roll.

即ち、ロール径が大きくなると、高さに対するロール間隙間量の変化が小さくなり、ある程度の隙間を確保するためには高さ(ロールの中立点(KP)からの距離)を大きく取る必要があるが、本実施例では上述したように、凹型ロール11a,11bの胴部13の径と端部14の径との径差分必ず隙間(袋状空間)15が確保できるのでロール径による問題は生じないのである。   That is, when the roll diameter is increased, the change in the gap amount between the rolls with respect to the height is reduced, and it is necessary to increase the height (distance from the neutral point (KP) of the roll) in order to secure a certain gap. However, in the present embodiment, as described above, the difference in diameter between the diameter of the body portion 13 and the diameter of the end portion 14 of the concave rolls 11a and 11b can always ensure a gap (bag-shaped space) 15, and thus a problem due to the roll diameter arises. There is no.

因みに、ノズル厚み:10mm、スリット(吐出口)幅10mmとすると、ノズル下端での厚みは10+10+10=30mmとなる。
仮に、特許文献2のロールを用いて、このノズルからロール表面まで5mmの隙間を確保できる位置を求めると次のようになる(ロール径R=1000mm,ドラム間の隙間=0mm)。
30/2+5=R(1−cosθ)、H=Rsinθ、R=1000により、ロールの中立点(KP)からの高さHは200mmとなる。
ここで、袋綴じロール(端部R=1000mm、胴部R=960mm)を用いノズル幅を胴部相当以下とすると、ノズル先端をロールの中立点(KP)に置くことができる。
Incidentally, if the nozzle thickness is 10 mm and the slit (discharge port) width is 10 mm, the thickness at the lower end of the nozzle is 10 + 10 + 10 = 30 mm.
If the position where a 5 mm gap can be secured from the nozzle to the roll surface is obtained using the roll of Patent Document 2, the following is obtained (roll diameter R = 1000 mm, gap between drums = 0 mm).
30/2 + 5 = R (1−cos θ), H = R sin θ, and R = 1000, the height H from the neutral point (KP) of the roll is 200 mm.
Here, when a bag binding roll (end R = 1000 mm, barrel R = 960 mm) is used and the nozzle width is equal to or less than the barrel, the tip of the nozzle can be placed at the neutral point (KP) of the roll.

これにより、初期注湯時に吐出流の勢いで溶鋼が飛散し、ロール11a,11bの表面に付着して二重肌が生成されることが回避されて鋳片性状の向上が図れる。   Thereby, molten steel is scattered by the momentum of the discharge flow at the time of initial pouring, and it is avoided that double skin is generated by adhering to the surfaces of the rolls 11a and 11b, and the slab properties can be improved.

また、図3に示すように、注湯ノズル12における浸漬ノズル部12bの片面側を、吐出口12cの下部一側面が開放されるぐらいに、カットすることでノズル先端厚みをより薄くすることができる。   Moreover, as shown in FIG. 3, the nozzle tip thickness can be made thinner by cutting one side of the immersion nozzle portion 12b of the pouring nozzle 12 so that the lower one side surface of the discharge port 12c is opened. it can.

これによれば、ノズル先端をより一層ロールの中立点(KP)に近づけられる。   According to this, the nozzle tip can be made closer to the neutral point (KP) of the roll.

図4は本発明の実施例2を示す双ロール式連続鋳造機の要部正面図、図5は同じく注湯ノズルの説明図で、同図(a)は正断面図、同図(b)は側断面図、同図(c)は同図(a)のA−A線断面図、図6はノズル幅方向の流速分布の比較を示すグラフである。   4 is a front view of a main part of a twin roll type continuous casting machine showing Embodiment 2 of the present invention, FIG. 5 is an explanatory view of a pouring nozzle, FIG. 4 (a) is a front sectional view, and FIG. Is a sectional side view, FIG. 6C is a sectional view taken along line AA of FIG. 6A, and FIG. 6 is a graph showing a comparison of flow velocity distributions in the nozzle width direction.

これは、実施例1における注湯ノズル12において、浸漬ノズル部12bの内部に吐出口12cの上部に位置して貫通孔構造の整流板16を設置すると共に、この整流板16下方の吐出口12c内面に縦溝又は縦の窪みからなる溝状の湯流れ捕捉部17a,17bを設けた例である。   This is because, in the pouring nozzle 12 in the first embodiment, a rectifying plate 16 having a through-hole structure is installed in the upper part of the discharge port 12c inside the immersion nozzle portion 12b, and the discharge port 12c below the rectification plate 16 is installed. This is an example in which groove-like hot water flow capturing portions 17a and 17b each having a vertical groove or a vertical depression are provided on the inner surface.

これによれば、整流板16を注湯ノズル12の上部におくことで、ノズル先端を細く形成することができ、実施例1のように鋳造ロールに凹型ロール11a,11bを用いなくてもノズル先端を可及的にロールの中立点(KP)に近づけることができる。図示例では、単なる円形のロール20a,20bが用いられているが、実施例1のように凹型ロール11a,11bを用いるとより一層ノズル先端をロールの中立点(KP)に近づけられることは言うまでもない。   According to this, by placing the baffle plate 16 on the top of the pouring nozzle 12, the nozzle tip can be formed thin, and the nozzle can be used without using the concave rolls 11a and 11b as the casting roll as in the first embodiment. The tip can be as close as possible to the neutral point (KP) of the roll. In the illustrated example, simple circular rolls 20a and 20b are used, but it goes without saying that if the concave rolls 11a and 11b are used as in the first embodiment, the nozzle tip can be made closer to the neutral point (KP) of the roll. Yes.

ところで、上述したように整流板16を注湯ノズル12の上部におくと、整流板16から下の部分では溶鋼が流下するに従って表面張力や縮流により偏流していき、折角整流板16で溶鋼流れを分散した効果が無くなるが、本実施例では、整流板16の下方に溝状の湯流れ捕捉部17a,17bを設けているので、図6に示すノズル幅方向の流速分布の比較を示すグラフでも判るように、溶鋼流れを拘束して整流板16での分散効果を持続することができる。また、この溝状の湯流れ捕捉部17a,17bの長さは、必ずしもノズル出口まで必要ではなく、整流板16の分散効果が持続できる長さだけ設定されていれば良い。   By the way, when the rectifying plate 16 is placed on the upper part of the pouring nozzle 12 as described above, the molten steel flows away from the rectifying plate 16 due to surface tension or contraction as the molten steel flows down. Although the effect of distributing the flow is lost, in the present embodiment, since the grooved hot water flow capturing portions 17a and 17b are provided below the current plate 16, a comparison of the flow velocity distribution in the nozzle width direction shown in FIG. 6 is shown. As can be seen from the graph, the molten steel flow can be constrained to maintain the dispersion effect on the rectifying plate 16. Further, the length of the groove-shaped hot water flow capturing portions 17a and 17b is not necessarily required up to the nozzle outlet, and may be set to a length that can maintain the dispersion effect of the rectifying plate 16.

尚、縦溝又は縦の窪みを仕切った場合、即ち、向き合ったノズル面(吐出口12c内面)の同じ位置に設けた場合、拘束力はより高められるが、仕切りにより流れが幅方向に分断されてします。そこで、本実施例では、向き合ったノズル面(吐出口12c内面)の湯流れ捕捉部17a,17bにおける縦溝又は縦の窪みを千鳥配置としている(図5の(c)参照)ので、縦溝又は縦の窪みの配置が途切れることがなくなり、幅方向の均一効果がより一層高められる。   In addition, when a vertical groove or a vertical depression is partitioned, that is, provided at the same position on the facing nozzle surface (inner surface of the discharge port 12c), the binding force is further increased, but the flow is divided in the width direction by the partition. I will. Therefore, in this embodiment, the vertical grooves or vertical depressions in the hot water flow capturing portions 17a and 17b on the nozzle surfaces facing each other (the inner surface of the discharge port 12c) are arranged in a staggered manner (see FIG. 5C). Alternatively, the arrangement of the vertical depressions is not interrupted, and the uniform effect in the width direction is further enhanced.

図7は本発明の実施例3を示す注湯ノズルの作用説明図、図8は注湯流量の制御フローである。   FIG. 7 is an explanatory diagram of the operation of the pouring nozzle showing Embodiment 3 of the present invention, and FIG. 8 is a control flow of the pouring flow rate.

これは、実施例1又は実施例2の双ロール式連続鋳造機を用いた連続鋳造方法において、注湯ノズル12の先端をロールの中立点(KP)に可及的に近づけた状態で注湯を開始し、その後注湯ノズルの先端を溶鋼21内に浸漬させたまま注湯ノズル12を上昇させるようにした例である。   In the continuous casting method using the twin roll type continuous casting machine of Example 1 or Example 2, the pouring is performed in a state where the tip of the pouring nozzle 12 is as close as possible to the neutral point (KP) of the roll. Then, the pouring nozzle 12 is raised while the tip of the pouring nozzle is immersed in the molten steel 21.

これによれば、実施例1及び2の作用効果に加えて、吐出流によるシェル湯洗いによりシェルの生成が阻害されることが回避されると共に、吐出流が湯面に当たって溶鋼21が飛散するのが回避され、鋳片性状のより一層の向上が図れる。   According to this, in addition to the effects of the first and second embodiments, it is avoided that generation of shells is inhibited by shell hot water washing by the discharge flow, and the molten steel 21 is scattered by the discharge flow hitting the molten metal surface. Is avoided, and the slab properties can be further improved.

加えて、本実施例では、図8に示すように、前記注湯開始時に溶鋼の供給流量を絞り、注湯ノズル12の先端が溶鋼21内に浸漬した後に供給流量を増やすようにしている。即ち、ステップP1の初期注湯流量Q0とステップP3の注湯流量Q1との間には、Q0<Q1の関係が有り、初期注湯流量Q0は吐出流が大きく飛散しない程度の流量で、注湯流量Q1は鋳造条件(鋳造速度、鋳片厚等)に応じた流量である。   In addition, in this embodiment, as shown in FIG. 8, the supply flow rate of the molten steel is reduced at the start of the pouring, and the supply flow rate is increased after the tip of the pouring nozzle 12 is immersed in the molten steel 21. That is, there is a relationship of Q0 <Q1 between the initial pouring flow rate Q0 in step P1 and the pouring flow rate Q1 in step P3, and the initial pouring flow rate Q0 is a flow rate at which the discharge flow is not greatly scattered. The hot water flow rate Q1 is a flow rate according to casting conditions (casting speed, slab thickness, etc.).

これによれば、前述した作用効果に加えて、注湯初期の溶鋼飛散を効果的に抑制しつつ早期に必要流量を確保でき、注湯流による凝固シェルの薄肉化が防止できるという利点が得られる。   According to this, in addition to the effects described above, there is an advantage that the necessary flow rate can be secured at an early stage while effectively suppressing molten steel scattering in the initial stage of pouring, and the thinning of the solidified shell due to the pouring flow can be prevented. It is done.

尚、本発明は上記各実施例に限定されず、本発明の要旨を逸脱しない範囲で、注湯ノズルにおける吐出口の形状変更等各種変更が可能であることは言うまでもない。   Needless to say, the present invention is not limited to the above-described embodiments, and various changes such as a change in the shape of the discharge port in the pouring nozzle can be made without departing from the scope of the present invention.

本発明に係る双ロール式連続鋳造機は、薄物の鋼板(ストリップ)や厚物の鋳片を問わず適用することができる。   The twin roll type continuous casting machine according to the present invention can be applied to a thin steel plate (strip) or a thick slab.

10 双ロール式連続鋳造機
11a,11b ロール(凹型ロール)
12 注湯ノズル
12a 注湯ノズル部
12b 浸漬ノズル部
12c 吐出口
13 ロールの胴部
14 ロールの端部
15 隙間(袋状空間)
16 整流板
17a,17b 湯流れ捕捉部
20a,20b 円形のロール
21 溶鋼
KP ロールの中立点
10 Twin roll type continuous casting machine 11a, 11b Roll (concave roll)
12 Pouring nozzle 12a Pouring nozzle portion 12b Immersion nozzle portion 12c Discharge port 13 Roll body 14 Roll end portion 15 Clearance (bag-like space)
16 Current plate 17a, 17b Hot water flow capturing part 20a, 20b Circular roll 21 Neutral point of molten steel KP roll

Claims (5)

互いに逆方向に回転する一対のロールの周面間に溶鋼を供給し、各ロールの周面で凝固した凝固シェルを各ロール間の隙間で圧接して鋳造した鋳片を、各ロール間の隙間から連続して引き出す双ロール式連続鋳造機において、
前記凝固シェルを袋綴じ状に圧接すべく前記一対のロールの少なくとも一方を凹型ロールに形成すると共に、
前記一対のロールの周面間に溶鋼を供給する注湯ノズルの先端をロールの中立点に可及的に近づけて挿入可能とした、
ことを特徴とする双ロール式連続鋳造機。
The molten steel is supplied between the circumferential surfaces of a pair of rolls rotating in opposite directions, and the cast slab cast by pressing the solidified shell solidified on the circumferential surface of each roll with the gap between the rolls is formed between the rolls. In the twin roll type continuous casting machine that draws continuously from
Forming at least one of the pair of rolls into a concave roll so as to press the solidified shell into a bag binding shape;
The tip of a pouring nozzle that supplies molten steel between the peripheral surfaces of the pair of rolls can be inserted as close as possible to the neutral point of the roll,
A twin-roll type continuous casting machine.
前記注湯ノズルの内部に、湯流れを分散する整流板を有すると共に該整流板の下方に分散した湯流れを保持する溝状の湯流れ捕捉部を設けたことを特徴とする請求項1に記載の双ロール式連続鋳造機。   The grooved hot water flow capturing portion is provided in the pouring nozzle, having a flow straightening plate for dispersing the hot water flow and holding the hot water flow dispersed below the flow straightening plate. The twin roll type continuous casting machine described. 互いに逆方向に回転する一対のロールの周面間に溶鋼を供給し、各ロールの周面で凝固した凝固シェルを各ロール間の隙間で圧接して鋳造した鋳片を、各ロール間の隙間から連続して引き出す双ロール式連続鋳造機において、
前記一対のロールの周面間に溶鋼を供給する注湯ノズルの内部に、湯流れを分散する整流板を有すると共に該整流板の下方に分散した湯流れを保持する溝状の湯流れ捕捉部を設けたことを特徴とする双ロール式連続鋳造機。
The molten steel is supplied between the circumferential surfaces of a pair of rolls rotating in opposite directions, and the cast slab cast by pressing the solidified shell solidified on the circumferential surface of each roll with the gap between the rolls is formed between the rolls. In the twin roll type continuous casting machine that draws continuously from
A grooved hot water flow catching portion having a flow straightening plate for dispersing the hot water flow inside the pouring nozzle for supplying molten steel between the peripheral surfaces of the pair of rolls and holding the hot water flow dispersed below the flow straightening plate. A twin-roll continuous casting machine characterized in that
前記請求項1,2又は3に記載の双ロール式連続鋳造機を用いた連続鋳造方法において、
注湯ノズルの先端をロールの中立点に可及的に近づけた状態で注湯を開始し、その後注湯ノズルの先端を溶鋼内に浸漬させたまま注湯ノズルを上昇させる、
ことを特徴とする双ロール式連続鋳造方法。
In the continuous casting method using the twin roll type continuous casting machine according to claim 1, 2, or 3,
Start pouring with the tip of the pouring nozzle as close as possible to the neutral point of the roll, and then raise the pouring nozzle while the tip of the pouring nozzle is immersed in the molten steel.
A twin-roll continuous casting method characterized by the above.
前記注湯開始時に溶鋼の供給流量を絞り、注湯ノズルの先端が溶鋼内に浸漬した後に供給流量を増やすことを特徴とする請求項4に記載の双ロール式連続鋳造方法。   The twin-roll continuous casting method according to claim 4, wherein the supply flow rate of molten steel is reduced at the start of pouring, and the supply flow rate is increased after the tip of the pouring nozzle is immersed in the molten steel.
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CN109840373A (en) * 2019-01-24 2019-06-04 太原科技大学 A method of thick steel plate is solved with the snakelike Calculating Rolling Force Energy Parameters of diameter friction speed
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
CN111745879A (en) * 2019-03-29 2020-10-09 江苏北星新材料科技有限公司 Micro-concave roller and method for manufacturing lithium ion battery diaphragm

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JPS61219449A (en) * 1985-03-27 1986-09-29 Mitsubishi Heavy Ind Ltd Continuous casting method for thin sheet
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CN109840373A (en) * 2019-01-24 2019-06-04 太原科技大学 A method of thick steel plate is solved with the snakelike Calculating Rolling Force Energy Parameters of diameter friction speed
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
CN111745879A (en) * 2019-03-29 2020-10-09 江苏北星新材料科技有限公司 Micro-concave roller and method for manufacturing lithium ion battery diaphragm

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