JP2008529796A - Steel strip continuous casting method and apparatus - Google Patents

Steel strip continuous casting method and apparatus Download PDF

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JP2008529796A
JP2008529796A JP2006552424A JP2006552424A JP2008529796A JP 2008529796 A JP2008529796 A JP 2008529796A JP 2006552424 A JP2006552424 A JP 2006552424A JP 2006552424 A JP2006552424 A JP 2006552424A JP 2008529796 A JP2008529796 A JP 2008529796A
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casting
nozzle
side wall
nozzle body
supply nozzle
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久彦 深瀬
史郎 長田
裕之 大塚
淳 平田
廣喜 吉澤
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キャストリップ・リミテッド・ライアビリティ・カンパニー
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/064—Accessories therefor for supplying molten metal
    • B22D11/0642—Nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles

Abstract

ストリップ鋳造機の鋳造溜めに溶融金属を供給する供給ノズルが、溶融金属を受けるトラフを形成する細長ノズル本体（１１）と、ノズル本体に沿い離間してトラフからの溶融金属をノズル本体側壁（１５）から側方外方に放出する側部出口開口（２３）とを有する。出口開口（２３）の下で側壁（１５）が延びすぼまってノズル下先端（３２）で交わることにより、鋳造溜め内のノズルトラフ下での気泡溜込みを抑制するよう構成された外面を有するノズル本体底部（３０）を形成する。
A supply nozzle that supplies molten metal to a casting pool of a strip casting machine has an elongated nozzle body (11) that forms a trough for receiving the molten metal, and a nozzle body side wall (15 ) And a side outlet opening (23) that discharges laterally outward. The side wall (15) extends under the outlet opening (23) and has an outer surface configured to suppress bubble accumulation under the nozzle trough in the casting pool by intersecting at the lower nozzle tip (32). A nozzle body bottom (30) is formed.

Description

本発明は金属ストリップ鋳造に関する。特に、鉄系の薄板金属ストリップ鋳造に適用されるが、これに限定されるものではない。   The present invention relates to metal strip casting. In particular, it is applied to iron-based sheet metal strip casting, but is not limited thereto.

双ロール鋳造機を用いた連続鋳造での薄板金属ストリップ鋳造が公知である。一対の、内部冷却され相互方向に回転する水平鋳造ロール間に溶融金属を導入することにより、動いているロール表面上に金属殻が凝固し、それらをロール間のロール間隙で合わせて、凝固した薄板ストリップ品を生み出し、ロール間のロール間隙から下方に送給する。「ロール間隙」という語は、本明細書では、ロール同士が最接近する領域全般を指すために用いる。溶融金属を取鍋から小容器へと注いで、そこから溶融金属が鋳造ロール間のロール間隙上方に位置した金属供給ノズルを流れ、ロール間隙直上の鋳造ロール表面に支持された溶融金属鋳造溜めを形成できる。この鋳造溜めは、ロール端に摺動係合保持される側部板又は側部堰間に閉じ込めることができる。   Sheet metal strip casting in continuous casting using a twin roll caster is known. By introducing the molten metal between a pair of internally cooled horizontal casting rolls that rotate in opposite directions, the metal shell solidifies on the surface of the moving roll, and they are solidified by combining them with the roll gap between the rolls. A thin strip product is produced and fed downward from the roll gap between the rolls. The term “roll gap” is used herein to refer to the entire area where the rolls are closest. The molten metal is poured from the ladle into a small container, from which the molten metal flows through a metal supply nozzle located above the roll gap between the casting rolls, and forms a molten metal casting reservoir supported on the casting roll surface immediately above the roll gap. Can be formed. This casting pool can be confined between side plates or side weirs that are slidably held at the roll ends.

双ロール鋳造機を用いた薄板鋼ストリップ鋳造の場合、鋳造溜め及びその内部へのスムーズな金属流が生じるよう金属供給ノズルの設計に多大の留意が払われている。従来提案されているのは、溶融金属を受けるトラフが形成される供給ノズルであり、鋳造作業中、斯かる供給ノズルの下部は鋳造溜めに浸漬し、溶融金属がノズル側部開口から鋳造溜めへ、ロールの鋳造表面に向け外方に流れ出ることができる。   In the case of sheet steel strip casting using a twin roll caster, great care has been taken in the design of the metal supply nozzle to produce a smooth flow of metal into the casting pool and inside. Conventionally proposed is a supply nozzle in which a trough that receives molten metal is formed. During the casting operation, the lower part of the supply nozzle is immersed in the casting reservoir, and the molten metal passes from the nozzle side opening to the casting reservoir. , Can flow outward toward the casting surface of the roll.

斯かる金属供給ノズルの例が、特許文献１及び特許文献２に開示されている。
特開平０９−１０３８５５号公報 アメリカ特許第６，０１２，５０８号 Examples of such metal supply nozzles are disclosed in Patent Document 1 and Patent Document 2.
JP 09-103855 A US Patent No. 6,012,508

我々の経験では、斯かる従来の双ロール鋳造機に底部が台形の金属供給ノズルを用い、平らな底部を鋳造溜めに浸漬した。斯かる先行技術の金属供給ノズルを図１に示す。その双ロール鋳造機で造られた薄板鋳造ストリップは凝固が不均一なために、鋳造ストリップに波紋状の縮みとそれに関連した割れが見られた。   In our experience, such a conventional twin roll caster used a trapezoidal metal feed nozzle at the bottom and immersed the flat bottom in the casting pool. Such a prior art metal supply nozzle is shown in FIG. The thin cast strip produced by the twin roll caster was unevenly solidified, and the cast strip showed rippled shrinkage and associated cracks.

本発明は、この問題を完全に緩和しないまでも抑制できる金属供給ノズルを提供する。     The present invention provides a metal supply nozzle that can suppress this problem even if it is not alleviated.

（ａ）長手方向に延びる側壁と端壁とを有してノズルトラフを形成する細長ノズル本体と、
（ｂ）トラフからの溶融金属流をノズル側部から側方外方に提供できる側壁の側部出口開口とからなり、
（ｃ）側部出口開口より下でノズル側壁が下方に延びすぼまってノズル下先端で交わり、鋳造溜め内のノズルトラフ下での気泡溜込みを抑制するよう構成された外面を有するノズル本体底部を形成することからなる、
ストリップ鋳造機の鋳造溜めに溶融金属を供給する金属供給ノズルが提供される。 (A) an elongated nozzle body having a side wall and an end wall extending in the longitudinal direction to form a nozzle trough;
(B) a side outlet opening on the side wall that can provide a molten metal flow from the trough laterally outward from the nozzle side,
(C) Nozzle body bottom having an outer surface configured to suppress the bubble accumulation under the nozzle trough in the casting reservoir by crossing the nozzle sidewall extending downward below the side outlet opening and intersecting at the nozzle lower tip. Consisting of forming,
A metal supply nozzle is provided for supplying molten metal to a casting pool of a strip caster.

側部出口開口は、ノズル側壁に沿い長手方向に離間できる。又、側部出口開口は、トラフ底部に隣接した溶融金属外向き流を提供できる。   The side outlet openings can be spaced longitudinally along the nozzle sidewall. The side outlet openings can also provide a molten metal outward flow adjacent to the trough bottom.

金属供給ノズルにおいて、底部は側壁延長部であっても、別個の部分であってもよい。いずれにしろ、底部はノズル本体に沿い下方内方に角度のついたほぼ平らな外面を有することができる。又、底部は、全体にほぼ平らな外面を有し、鋭角で交わってノズル本体に沿う際だった端を形成してもよい。若しくは、底部が凸状に湾曲した外面を有し、それがノズル本体底先端でノズル本体に沿い弧状に交わってもよい。   In the metal supply nozzle, the bottom may be a side wall extension or a separate part. In any case, the bottom can have a generally flat outer surface that is angled inward and downward along the nozzle body. Also, the bottom may have a generally flat outer surface as a whole and form an end that intersects the nozzle body at an acute angle. Alternatively, the bottom portion may have an outer surface curved in a convex shape, and it may intersect in an arc along the nozzle body at the nozzle body bottom end.

又、実施例によっては、側壁上部が下方に延びて底部を形成し、ノズル本体に沿い凸状に湾曲した外面を備えてよい。加えて、底部を形成する側壁の凸状に湾曲した外面がノズル本体に沿った丸形に底先端で交わってよい。若しくは、底部を形成する側壁の凸状に湾曲した外面が底先端で鋭角に交わって、ノズル本体に沿う際だった端を形成することができる。   In some embodiments, the upper portion of the side wall may extend downward to form a bottom portion, and may have an outer surface that is curved in a convex shape along the nozzle body. In addition, the convexly curved outer surfaces of the side walls forming the bottom may intersect with a round shape along the nozzle body at the bottom tip. Alternatively, the convexly curved outer surface of the side wall forming the bottom portion can intersect at an acute angle at the bottom tip to form an end that is in line with the nozzle body.

双ロール鋳造機において上記形状の供給ノズルを用いることで、双ロール鋳造機で造られる薄板鋳造ストリップには、不均一な凝固が原因の波紋状の縮れとそれに関連した割れが、完全になくならないとしても、抑制されることが見いだされた。因果関係は定かではないが、鋳造溜めに生じる気泡が金属供給ノズル底部の下で溜め込まれて集まって大きな気泡とならないからというのが一解釈である。大きな気泡は、均衡が破れると、鋳造溜め表面に外乱をもたらし得るからである。ガスが鋳造溜めに形成されるのは、溶融金属スラグ中の酸化物と溶融金属中の炭素と金属供給ノズルを構成するのに使われるノズル耐火材との間の反応によることが知られている。底部を形成する側壁外面及び上部側壁外面に沿いガスがスムーズに上昇して直ちに放出されると、鋳造溜め表面の外乱は完全に軽減されないとしても減少し、鋳造ストリップの波紋欠陥と割れが、完全になくならないとしても抑制されると考えられる。   By using a feed nozzle of the above shape in a twin roll caster, the ripple cast and the associated cracks due to non-uniform solidification are not completely eliminated in the sheet cast strip produced by the twin roll caster. Even so, it was found to be suppressed. Although the causal relationship is not clear, it is one interpretation that bubbles generated in the casting pool are collected under the bottom of the metal supply nozzle and do not collect to form large bubbles. This is because large bubbles can cause disturbances in the casting pool surface if the balance is broken. It is known that the gas is formed in the casting sump due to the reaction between the oxide in the molten metal slag, the carbon in the molten metal, and the nozzle refractory used to construct the metal supply nozzle. . If the gas rises smoothly along the outer side wall of the bottom and the upper side wall and is released immediately, the disturbance on the casting pool surface is reduced, if not completely reduced, and the ripples and cracks in the casting strip are completely eliminated. Even if it does not disappear, it is thought that it will be suppressed.

更に又、金属供給ノズルのノズル本体の長手方向側壁及び端壁を、炭素を含有しない耐火材で形成することができる。斯かる非崩壊的な耐火材により、発生ガスの放出が促進されると考えられる。加えて、ノズル側壁外面をケイ酸アルカリ塩材料、アルミナ、ジルコニア又はマグネシア等の、炭素を含有しない材料で被覆すると、スムーズなガス放出が更に促進されると考えられる。   Furthermore, the longitudinal side wall and the end wall of the nozzle body of the metal supply nozzle can be formed of a refractory material that does not contain carbon. Such a non-destructive refractory material is considered to promote the release of the generated gas. In addition, it is considered that smooth outgassing is further promoted when the outer surface of the nozzle side wall is coated with a material not containing carbon, such as an alkali silicate material, alumina, zirconia, or magnesia.

本発明は、両者間にロール間隙を形成する一対の横方向に位置した鋳造ロールと、鋳造ロール間のロール間隙に沿いロール間隙上方に配した細長金属供給ノズルとからなる薄板金属ストリップ連続鋳造装置にも範囲が及ぶ。金属供給ノズルは、溶融金属を供給してロール間隙上方で鋳造ロール上に支持される溶融金属鋳造溜めを形成することができる。供給ノズルは、長手方向に延びる側壁と端壁とを配してノズルトラフを形成する細長ノズル本体からなり、側壁の側部出口開口はトラフからの溶融金属流をノズル側壁から側方外方に鋳造ロールの外周面に向けて軸方向に提供することができる。側部出口開口の下でノズル側壁が下方に延びすぼまってノズル下先端で交わり、鋳造溜め内のノズルトラフ下で気泡が溜込まれるのを抑制するよう構成した外面を有するノズル本体底部を形成する。   The present invention relates to a sheet metal strip continuous casting apparatus comprising a pair of laterally located casting rolls forming a roll gap therebetween and an elongated metal supply nozzle disposed above the roll gap along the roll gap between the casting rolls. Range. The metal supply nozzle can supply molten metal to form a molten metal casting pool that is supported on the casting roll above the roll gap. The supply nozzle is composed of an elongated nozzle body having a longitudinally extending side wall and an end wall to form a nozzle trough, and a side outlet opening on the side wall casts a molten metal flow from the trough laterally outward from the nozzle side wall. It can be provided in the axial direction toward the outer peripheral surface of the roll. Underneath the side outlet opening, the nozzle sidewall extends downward and intersects at the nozzle tip, forming the bottom of the nozzle body with an outer surface configured to prevent air bubbles from being trapped under the nozzle trough in the casting pool To do.

加えて、若しくはその替わりに、両者間にロール間隙を形成するよう位置決めされた一対の鋳造ロールを有する薄板ストリップ鋳造機を組み立てる段階と、ロール間隙上方の鋳造ロール間で鋳造溜めを形成でき、ロール端に隣接した側部堰で鋳造溜めを閉じ込める金属供給システムを組み立てる段階と、金属供給システムの一部として上記構成のいずれか一つの供給ノズルを組み立てる段階とからなる薄板金属ストリップ連続鋳造方法も提供される。   In addition, or alternatively, the casting strip can be formed between the casting strip having a pair of casting rolls positioned to form a roll gap therebetween and between the casting rolls above the roll gap. A sheet metal strip continuous casting method comprising the steps of assembling a metal supply system for confining the casting pool with a side dam adjacent to the end and assembling any one of the above-described supply nozzles as part of the metal supply system is also provided. Is done.

本発明を更に詳細に説明できるようにするため、添付図面に関連していくつか特定の実施例を記述する。   In order that the present invention may be described in further detail, certain specific embodiments are described in connection with the accompanying drawings.

図２に関し、本発明の金属供給ノズルを示す。溶融金属１を受けるための細長ノズル本体１１に形成される一対の長手方向側壁１５の下部が下方に延びて互いに接近し、下先端で交わってノズル本体底部３０を形成する。一対の端壁１９も長手方向側壁１５に接合して底部３０を形成する。   FIG. 2 shows the metal supply nozzle of the present invention. Lower portions of a pair of longitudinal side walls 15 formed in the elongated nozzle body 11 for receiving the molten metal 1 extend downward and approach each other, and intersect at the lower tip to form the nozzle body bottom 30. A pair of end walls 19 are also joined to the longitudinal side wall 15 to form a bottom 30.

金属供給ノズルは、双ロール鋳造機の側部堰７及び鋳造ロール６で囲まれた空間内のロール間隙Ｇ上方に配する。長手方向側壁１５の下部に設けられた複数の側部出口開口２３を介し溶融金属はノズル本体１１から放出でき、鋳造ロール６外周面へと向けられる。溶融金属１がノズルトラフ１１を介し流れると、溶融金属鋳造溜め１０が鋳造ロール６外周面に接してロール間隙Ｇ上方に形成される。   The metal supply nozzle is disposed above the roll gap G in the space surrounded by the side dam 7 and the casting roll 6 of the twin roll casting machine. Molten metal can be discharged from the nozzle body 11 through a plurality of side outlet openings 23 provided in the lower part of the longitudinal side wall 15 and directed to the outer peripheral surface of the casting roll 6. When the molten metal 1 flows through the nozzle trough 11, a molten metal casting pool 10 is formed above the roll gap G in contact with the outer peripheral surface of the casting roll 6.

ノズル本体１１の下方に延びる側壁１５が底部３０を形成して供給ノズルの底先端３２に延びる。図２に示した供給ノズルでは、ノズル底部３０の側壁３１は全体にほぼ平らな外面であって鋭角に交わり、ノズル本体に沿い底先端３２に際だった端(distinct edge)を形成する。   A side wall 15 extending downward from the nozzle body 11 forms a bottom 30 and extends to a bottom tip 32 of the supply nozzle. In the supply nozzle shown in FIG. 2, the side wall 31 of the nozzle bottom 30 is a generally flat outer surface and intersects at an acute angle, forming a distinct edge at the bottom tip 32 along the nozzle body.

図２に示したような金属供給ノズルを備えた双ロール鋳造機では、鋳造ロール６が相互方向に回転して溶融金属鋳造溜め１０が形成される。冷却水が鋳造ロール６内を流れるので鋳造ロール６を介し溶融金属１が抜熱され、金属殻が鋳造ロール６外周面に凝固し、鋳造ロール間のロール間隙Ｇで薄板ストリップ８が鋳造され、ロール間隙Ｇから下方に送給される。   In the twin roll casting machine provided with the metal supply nozzle as shown in FIG. 2, the casting roll 6 rotates in the mutual direction to form the molten metal casting reservoir 10. Since the cooling water flows in the casting roll 6, the molten metal 1 is removed through the casting roll 6, the metal shell is solidified on the outer peripheral surface of the casting roll 6, and the thin strip 8 is cast at the roll gap G between the casting rolls. It is fed downward from the roll gap G.

このようにして製造される薄板鋳造ストリップでは、波紋状の縮れが鋳造ストリップ８表面に生じるのが完全になくなるわけではないにしろ抑制されるのが見いだされた。我々の実験によれば、溶融金属溜め１０に生じる一酸化炭素等の同伴ガスが長手方向側壁１５に沿い小さな気泡として上昇でき、図１に示した平らな基部の下のようには溶融金属鋳造溜め１０に溜込まれないと考えられる。鋳造溜めに生じたガスは側壁３１に沿い上昇し、鋳造溜め１０表面で安定してコントロールされた状態で逃げると考えられる。従って、我々の実験によれば、大径の気泡が上方に浮上することによる溶融金属溜め１０表面の外乱は、完全に緩和されないにしろ減少し、鋳造ストリップ８表面の波紋状の縮れが完全になくならないにしろ抑制される、と考えられる。   It has been found that the thin cast strip produced in this way is suppressed, if not completely eliminated, from generating ripples on the surface of the cast strip 8. According to our experiments, entrained gas such as carbon monoxide generated in the molten metal reservoir 10 can rise as small bubbles along the longitudinal side wall 15, and the molten metal casting is located under the flat base shown in FIG. It is considered that it is not stored in the reservoir 10. It is considered that the gas generated in the casting pool rises along the side wall 31 and escapes in a state of being stably controlled on the surface of the casting pool 10. Therefore, according to our experiment, the disturbance on the surface of the molten metal reservoir 10 due to the rising of the large diameter bubbles is reduced, if not completely mitigated, and the ripples on the surface of the casting strip 8 are completely eliminated. It is thought that it will be suppressed if it does not disappear.

図３は本発明の第２の供給ノズルを示す。溶融金属１を受ける細長ノズル本体１２には一対の長手方向側壁１６と、長手方向側壁１６に接合する一対の端壁２０とが形成される。側壁１６の下部は相互に近づいてノズル本体の下先端で交わる。   FIG. 3 shows a second supply nozzle of the present invention. The elongated nozzle body 12 that receives the molten metal 1 is formed with a pair of longitudinal side walls 16 and a pair of end walls 20 that are joined to the longitudinal side walls 16. The lower portions of the side walls 16 approach each other and meet at the lower tip of the nozzle body.

金属供給ノズルは、双ロール鋳造機の側部堰７及び鋳造ロール６で囲まれる空間内のロール間隙Ｇ上方に配する。長手方向側壁１６の下部に設けられた複数の側部出口開口２４はノズル本体１２からの溶融金属を鋳造ロール６外周面に向けて放出できる。溶融金属１がノズル本体１２を流れると、溶融金属鋳造溜め１０が鋳造ロール６外周面のロール間隙Ｇ上方に形成される。   The metal supply nozzle is disposed above the roll gap G in the space surrounded by the side dam 7 and the casting roll 6 of the twin roll casting machine. A plurality of side outlet openings 24 provided in the lower part of the longitudinal side wall 16 can discharge the molten metal from the nozzle body 12 toward the outer peripheral surface of the casting roll 6. When the molten metal 1 flows through the nozzle body 12, a molten metal casting pool 10 is formed above the roll gap G on the outer peripheral surface of the casting roll 6.

この場合、下方に延びる側壁１６がノズル底部３３を形成してノズル底先端３５へと延びる。側壁３４の上部外面はほぼ平らで、図２のノズル本体側壁３１と同様に下方内方にテーパーしている。しかしながら、この実施例においては側壁３３の底部外面は凸状に湾曲していてノズル底先端で交わってノズル本体に沿う弧状の底端をなす。   In this case, the side wall 16 extending downward forms the nozzle bottom 33 and extends to the nozzle bottom tip 35. The upper outer surface of the side wall 34 is substantially flat and tapers inward and downward in the same manner as the nozzle body side wall 31 of FIG. However, in this embodiment, the bottom outer surface of the side wall 33 is convexly curved and intersects at the nozzle bottom tip to form an arc-shaped bottom end along the nozzle body.

図３に示したような金属供給ノズルを備えた双ロール鋳造機では、鋳造ロール６が相互方向に回転して溶融金属鋳造溜め１０が形成される。冷却水が鋳造ロール内を流れるので、溶融金属１が抜熱されて、金属殻が鋳造ロール６外周面に凝固し、ロール間隙Ｇに薄板鋳造ストリップ８を形成してロール間隙Ｇから下方に送給される。   In the twin roll casting machine provided with the metal supply nozzle as shown in FIG. 3, the casting roll 6 rotates in the mutual direction to form the molten metal casting pool 10. Since the cooling water flows in the casting roll, the molten metal 1 is removed and the metal shell is solidified on the outer peripheral surface of the casting roll 6 to form a thin plate casting strip 8 in the roll gap G and sent downward from the roll gap G. Be paid.

形成される薄板鋳造ストリップ８は表面の波紋状の縮れが完全になくなるわけではないにしろ抑制される。我々の研究によれば、これは溶融金属鋳造溜め１０に生じる一酸化炭素その他の同伴ガスが、金属供給ノズル長手方向側壁１６の底部３０の形状故に鋳造溜め１０に溜込まれず、長手方向側壁１６に沿い小さな気泡の形で全般に上昇するために生じると考えられる。従って、大径の気泡が上方に浮上することによる溶融金属鋳造溜め１０表面の外乱は、完全に緩和されないにしろ大幅に減少し、薄板鋳造ストリップ８表面の波紋状の縮れは、完全になくならないにしろ抑制されると考えられる。   The formed cast strip 8 is suppressed, if not completely eliminated, from the ripples on the surface. According to our study, this is because carbon monoxide and other entrained gases generated in the molten metal casting reservoir 10 are not accumulated in the casting reservoir 10 because of the shape of the bottom 30 of the metal supply nozzle longitudinal sidewall 16, and the longitudinal sidewall 16 It is thought that it occurs because it rises generally in the form of small bubbles along. Therefore, the disturbance on the surface of the molten metal casting pool 10 due to the rising of the large-sized air bubbles is greatly reduced if not completely mitigated, and the ripple-like crimp on the surface of the thin cast strip 8 is not completely eliminated. It is thought that it will be suppressed.

図４は本発明の第３の金属供給ノズルを示し、溶融金属１を受けるノズル本体１３には一対の長手方向側壁１７と、各長手方向側壁１７に接合する一対の端壁２１が形成される。下部は互いに次第に近づき下先端で交わって底部３６を形成する。   FIG. 4 shows a third metal supply nozzle according to the present invention. A nozzle body 13 for receiving the molten metal 1 is formed with a pair of longitudinal side walls 17 and a pair of end walls 21 joined to each longitudinal side wall 17. . The lower parts gradually approach each other and intersect at the lower tip to form the bottom 36.

ノズル底部３６の側壁３７を形成する下方に延びる側壁１７はノズル本体の底先端３８に至る。側壁３７の外面は凸状に湾曲して、ノズル本体の底先端でほぼ鋭角に交わってノズル本体に沿う際だった底端を形成する。   The downwardly extending side wall 17 forming the side wall 37 of the nozzle bottom 36 reaches the bottom tip 38 of the nozzle body. The outer surface of the side wall 37 is convexly curved to form a bottom end that intersects the nozzle body at a substantially acute angle at the bottom tip of the nozzle body.

金属供給ノズルは双ロール鋳造機の側部堰７及び鋳造ロール６で囲まれる空間内のロール間隙Ｇ上方に配される。長手方向側壁１７の下部に設けられた複数の側部出口開口２５は溶融金属をノズル本体１３から鋳造ロール６外周面に向けて放出できる。溶融金属１がノズル本体１３を流れると、溶融金属鋳造溜め１０が鋳造ロール６外周面のロール間隙Ｇ上方に形成される。   The metal supply nozzle is arranged above the roll gap G in the space surrounded by the side dam 7 and the casting roll 6 of the twin roll casting machine. A plurality of side outlet openings 25 provided in the lower part of the longitudinal side wall 17 can discharge molten metal from the nozzle body 13 toward the outer peripheral surface of the casting roll 6. When molten metal 1 flows through nozzle body 13, molten metal casting pool 10 is formed above roll gap G on the outer peripheral surface of casting roll 6.

図４に示したような金属供給ノズルを備えた双ロール鋳造機では、鋳造ロール６が相互方向に回転して溶融金属の鋳造溜め１０が形成される。冷却水が鋳造ロールの中を流れるので、溶融金属１が抜熱されて、金属殻が鋳造ロール６外周面に凝固し、ロール間隙Ｇに薄板鋳造ストリップ８を形成してロール間隙Ｇから下方に送給される。   In the twin roll casting machine provided with the metal supply nozzle as shown in FIG. 4, the casting roll 6 rotates in the mutual direction to form a molten metal casting reservoir 10. Since the cooling water flows through the casting roll, the molten metal 1 is removed from heat, the metal shell solidifies on the outer peripheral surface of the casting roll 6, and a thin plate casting strip 8 is formed in the roll gap G to move downward from the roll gap G. Be sent.

ここでも、形成される薄板鋳造ストリップ８は表面の波紋状の縮れが完全になくなるわけではないにしろ抑制される。我々の研究によれば、溶融金属鋳造溜め１０に生じる一酸化炭素その他の同伴ガスが、底部を形成するノズル本体長手方向側壁１７の下部外面の形状故に溶融金属鋳造溜め１０に溜込まれず、長手方向側壁１７に沿いほぼ小さな気泡の形で上昇できると考えられる。従って、大径の気泡が上方に浮上することによる溶融金属溜め１０表面の外乱は、完全に緩和されないにしろ減少され、ストリップ８表面の波紋状の縮れは、完全になくならないにしろ抑制されると考えられる。   Here again, the formed thin cast strip 8 is suppressed, if not completely eliminated, from the ripples on the surface. According to our research, carbon monoxide and other entrained gas generated in the molten metal casting reservoir 10 are not accumulated in the molten metal casting reservoir 10 because of the shape of the lower outer surface of the nozzle body longitudinal side wall 17 forming the bottom. It is thought that it can rise in the form of small bubbles along the directional side wall 17. Therefore, the disturbance on the surface of the molten metal reservoir 10 due to the rising of the large-sized air bubbles upwards is reduced if not completely mitigated, and the ripples on the surface of the strip 8 are suppressed if not completely eliminated. it is conceivable that.

図５は本発明の第４の供給ノズルを示す。溶融金属１を受けるノズル本体１４には一対の長手方向側壁１８と、長手方向側壁１８に各々接合する一対の端壁２２とが形成される。側壁１８の下部は相互に次第に近づいて底先端で交わる。下方に延びる長手方向壁１８が、底先端４８に延びるノズル本体底部４６側壁４７を形成する。側壁４７の外面は凸状に湾曲して交わり、ノズル本体に沿った丸形のノズル本体底部を形成する。   FIG. 5 shows a fourth supply nozzle of the present invention. The nozzle body 14 that receives the molten metal 1 is formed with a pair of longitudinal side walls 18 and a pair of end walls 22 that are respectively joined to the longitudinal side walls 18. The lower portions of the side walls 18 gradually approach each other and meet at the bottom tip. A downwardly extending longitudinal wall 18 forms a nozzle body bottom 46 side wall 47 that extends to a bottom tip 48. The outer surfaces of the side walls 47 are curved and intersect to form a round nozzle body bottom along the nozzle body.

溶融金属供給ノズルは、双ロール鋳造機の側部堰７と鋳造ロール６で囲まれる空間内のロール間隙Ｇ上方に配する。長手方向側壁１８下部で、複数の側部出口開口２６は溶融金属をノズル本体１４から鋳造ロール６外周面に向けて放出できる。溶融金属がノズル本体１４を流れると、冷却ロール６外周面に接触して溶融金属鋳造溜め１０がロール間隙Ｇ上方に形成される。   The molten metal supply nozzle is disposed above the roll gap G in the space surrounded by the side dam 7 and the casting roll 6 of the twin roll casting machine. Below the longitudinal side wall 18, the plurality of side outlet openings 26 can discharge molten metal from the nozzle body 14 toward the outer peripheral surface of the casting roll 6. When the molten metal flows through the nozzle body 14, the molten metal casting pool 10 is formed above the roll gap G in contact with the outer peripheral surface of the cooling roll 6.

図５に示したような金属供給ノズルを備えた双ロール鋳造機では、鋳造ロール６が相互方向に回転して溶融金属鋳造溜め１０が形成される。冷却水が鋳造ロール１６内を流れるので、溶融金属１が抜熱されて、金属殻が鋳造ロール６外周面に凝固し、ロール間隙Ｇに薄板鋳造ストリップ８を形成してロール間隙Ｇから下方に送給される。   In the twin roll casting machine provided with the metal supply nozzle as shown in FIG. 5, the casting roll 6 rotates in the mutual direction to form the molten metal casting reservoir 10. Since the cooling water flows in the casting roll 16, the molten metal 1 is removed from heat, the metal shell solidifies on the outer peripheral surface of the casting roll 6, and a thin plate casting strip 8 is formed in the roll gap G to move downward from the roll gap G. Be sent.

ここでも、形成される薄板鋳造ストリップ８は表面に波紋状の縮れが生じるのが完全になくならないにしろ抑制される。我々の研究によれば、溶融金属鋳造溜め１０に生じる一酸化炭素等の同伴ガスが、ノズル本体長手方向側壁１８の底部外面形状故に鋳造溜め１０に溜込まれず、ノズル本体長手方向側壁１８に沿い小さな気泡の形で上昇すると考えられる。従って、大径の気泡が上方に浮上することによる溶融金属溜め１０表面の外乱は、緩和されないにしろ減少され、ストリップ８表面の波紋状の縮れはなくならないにしろ抑制されると考えられる。   Here too, the thin cast strip 8 to be formed is suppressed if it does not completely eliminate the occurrence of ripples on the surface. According to our research, entrained gas such as carbon monoxide generated in the molten metal casting reservoir 10 is not accumulated in the casting reservoir 10 due to the shape of the bottom outer surface of the nozzle body longitudinal side wall 18, but along the nozzle body longitudinal side wall 18. It is thought to rise in the form of small bubbles. Therefore, it is considered that the disturbance on the surface of the molten metal reservoir 10 due to the rising of the large-sized bubbles upwards is reduced if it is not alleviated, and the ripples on the surface of the strip 8 are not suppressed if it is not eliminated.

更に又、図２〜図５に示した長手方向側壁１５，１６，１７，１８の表面をケイ酸アルカリ塩釉薬（水ガラス）等の炭素を含有しない材料で覆えば、小さな気泡が長手方向側壁１５，１６，１７，１８に付着するのが防がれる。   Furthermore, if the surfaces of the longitudinal side walls 15, 16, 17, and 18 shown in FIGS. 2 to 5 are covered with a carbon-free material such as alkali silicate glaze (water glass), small bubbles are formed in the longitudinal side walls. Adhering to 15, 16, 17, and 18 is prevented.

更に又、炭素を含まない、アルミナ、ジルコニア及びマグネシアなどの耐火材を長手方向側壁１５，１６，１７，１８及び端壁１９，２０，２１，２２を構成するのに使えば、溶融金属鋳造溜め１０の内部での一酸化炭素その他のガスの発生が制限され、気泡生成量が減少する。   Furthermore, if a refractory material such as alumina, zirconia and magnesia, which does not contain carbon, is used to form the longitudinal side walls 15, 16, 17, 18 and the end walls 19, 20, 21, 22, 22, a molten metal casting reservoir. The generation of carbon monoxide and other gases inside 10 is limited, and the amount of bubble generation is reduced.

以上、本発明を特定の実施例に関し詳細に記述してきたが、本発明はこれら記述した実施例に限定されるものではないと理解すべきである。むしろ、本発明は本発明の範囲内にある変更例、改変例及び同等構造を包含し、それらの権利保護が希望される。   Although the invention has been described in detail with reference to specific embodiments, it should be understood that the invention is not limited to these described embodiments. Rather, the present invention includes modifications, alterations, and equivalent structures that are within the scope of the present invention, and protection of those rights is desired.

先行技術の金属供給ノズルを示す断面図である。It is sectional drawing which shows the metal supply nozzle of a prior art. 本発明の金属供給ノズルの第１実施例を示す断面図である。It is sectional drawing which shows 1st Example of the metal supply nozzle of this invention. 本発明の金属供給ノズルの第２実施例を示す断面図である。It is sectional drawing which shows 2nd Example of the metal supply nozzle of this invention. 本発明の金属供給ノズルの第３実施例を示す断面図である。It is sectional drawing which shows 3rd Example of the metal supply nozzle of this invention. 本発明の金属供給ノズルの第４実施例を示す断面図である。It is sectional drawing which shows 4th Example of the metal supply nozzle of this invention.

Claims (16)

長手方向に延びる側壁と端壁とを有してノズルトラフを形成する細長ノズル本体と、
ノズル本体からの溶融金属をノズル本体の側壁から側方外方に放出できる側壁の側部出口開口とからなり、
ノズル本体の側壁が側部出口開口下方で下方に延びすぼまってノズル下先端で交差して、鋳造溜め内のノズルトラフ下での気泡溜込みを抑制するよう構成された外面を有するノズル本体底部を形成することからなる、
ストリップ鋳造機の鋳造溜めに溶融金属を供給する供給ノズル。 An elongated nozzle body having a side wall and an end wall extending in the longitudinal direction to form a nozzle trough;
It consists of a side outlet opening on the side wall that can discharge the molten metal from the nozzle body laterally outward from the side wall of the nozzle body,
Nozzle body bottom having an outer surface configured such that the side wall of the nozzle body extends downward below the side outlet opening and intersects at the lower tip of the nozzle to suppress bubble accumulation under the nozzle trough in the casting pool Consisting of forming,
Supply nozzle that supplies molten metal to the casting pool of the strip casting machine. 側部出口開口が側壁に沿い長手方向に離間している、請求項１に記載の供給ノズル。   The supply nozzle of claim 1, wherein the side outlet openings are longitudinally spaced along the side wall. 側部出口開口がトラフ底部に隣接した溶融金属外向き流を提供できる、請求項１又は２に記載の供給ノズル。   3. A supply nozzle according to claim 1 or 2, wherein the side outlet opening can provide a molten metal outward flow adjacent to the trough bottom. 底部が側壁と一体になった部分である、請求項１乃至３のいずれかに記載の供給ノズル。   The supply nozzle according to any one of claims 1 to 3, wherein the bottom is a portion integrated with the side wall. 底部が側壁とは別個の部分である、請求項１乃至３のいずれかに記載の供給ノズル。   The supply nozzle according to claim 1, wherein the bottom part is a part separate from the side wall. 底部を形成する側壁の上部が、ノズル本体に沿って下方内方に角度のついたほぼ平らな外面を有する、請求項１乃至４のいずれかに記載の供給ノズル。   5. A supply nozzle as claimed in any one of the preceding claims, wherein the upper part of the side wall forming the bottom has a substantially flat outer surface angled downward inward along the nozzle body. 下方に延びて底部を形成するノズル本体側壁が全体にほぼ平らな外面を有し、鋭角で交差して、ノズル本体に沿い際だった端を形成する、請求項６に記載の供給ノズル。   The supply nozzle of claim 6, wherein the nozzle body sidewalls extending downward to form a bottom have a generally flat outer surface and intersect at an acute angle to form a sharp edge along the nozzle body. 下方に延びて底部を形成するノズル本体側壁が凸状に湾曲した外面を有し、ノズル本体底先端で交差してノズル本体に沿った尖った形状をなす、請求項１乃至４のいずれかに記載の供給ノズル。   The nozzle body side wall extending downward to form a bottom portion has a convexly curved outer surface, and intersects at the nozzle body bottom tip to form a pointed shape along the nozzle body. The supply nozzle described. 下方に延びて底部を形成する側壁の上部が、ノズル本体に沿った凸状に湾曲する外面を有する、請求項１乃至４のいずれかに記載の供給ノズル。   The supply nozzle according to any one of claims 1 to 4, wherein an upper portion of a side wall extending downward to form a bottom has an outer surface curved in a convex shape along the nozzle body. 底部を形成する、側壁の凸状に湾曲した外面が底先端で交差してノズル本体に沿った丸い形状をなす、請求項９に記載の供給ノズル。   The supply nozzle according to claim 9, wherein the outer curved surface of the side wall that forms the bottom part intersects at the bottom tip to form a round shape along the nozzle body. 底部を形成する側壁の凸状に湾曲した外面が底先端で鋭角に交差してノズル本体に沿い際だった端を形成する、請求項９に記載の供給ノズル。   The supply nozzle according to claim 9, wherein the convexly curved outer surface of the side wall forming the bottom portion intersects an acute angle at the bottom tip to form a sharp edge along the nozzle body. 側壁外面を、炭素を含有しない材料で被覆する、請求項１乃至１１のいずれかに記載の供給ノズル。   The supply nozzle according to claim 1, wherein the outer surface of the side wall is coated with a material not containing carbon. 前記炭素を含有しない材料がケイ酸アルカリ塩材料である、請求項１２に記載の供給ノズル。   The supply nozzle according to claim 12, wherein the carbon-free material is an alkali silicate material. ノズル本体長手方向側壁及び端壁を、炭素を含有しない耐火材で形成する、請求項１乃至１３のいずれかに記載の供給ノズル。   The supply nozzle according to any one of claims 1 to 13, wherein the nozzle body longitudinal side wall and the end wall are formed of a refractory material containing no carbon. 両者間にロール間隙を形成する一対の横方向に位置した鋳造ロールと、鋳造ロール間のロール間隙上方に且つそれに沿って配し、溶融金属を放出してロール間隙上方で鋳造ロールに支持される溶融金属鋳造溜めを形成できる細長金属供給ノズルとからなり、供給ノズルが請求項1乃至14のいずれかに記載の如く構成されている、薄板金属ストリップの連続鋳造装置。   A pair of laterally located casting rolls forming a roll gap between them, and the upper side of and between the roll gaps between the casting rolls, the molten metal is discharged and supported by the casting rolls above the roll gap. 15. A continuous casting apparatus for a thin metal strip, comprising an elongated metal supply nozzle capable of forming a molten metal casting reservoir, wherein the supply nozzle is configured as in any one of claims 1 to 14. 両者間にロール間隙を形成するよう位置した一対の鋳造ロールを有する薄板ストリップ鋳造機を組み立て、ロール間隙上方で鋳造ロール間に鋳造溜めを形成することができ、ロール間隙の端に隣接した側部堰で鋳造溜めを画成する、金属供給システムを組み立て、金属供給システムの一部として、請求項１乃至１４のいずれかに記述した如き構成の細長ノズル本体からなる供給ノズルを組み立てることからなる薄板金属ストリップの連続鋳造方法。   Assemble a sheet strip casting machine with a pair of casting rolls positioned to form a roll gap between them, and form a casting pool between the casting rolls above the roll gap, the side adjacent to the end of the roll gap A thin plate comprising: assembling a metal supply system that defines a casting reservoir with a weir; and assembling a supply nozzle comprising an elongated nozzle body configured as described in any of claims 1 to 14 as part of the metal supply system Continuous casting method for metal strip.
JP2006552424A 2004-02-17 2005-02-14 Steel strip continuous casting method and apparatus Pending JP2008529796A (en)

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KR20070001190A (en) 2007-01-03

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