JP2005230826A - Nozzle for supplying molten metal - Google Patents

Nozzle for supplying molten metal Download PDF

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Publication number
JP2005230826A
JP2005230826A JP2004039494A JP2004039494A JP2005230826A JP 2005230826 A JP2005230826 A JP 2005230826A JP 2004039494 A JP2004039494 A JP 2004039494A JP 2004039494 A JP2004039494 A JP 2004039494A JP 2005230826 A JP2005230826 A JP 2005230826A
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JP
Japan
Prior art keywords
molten metal
longitudinal side
side wall
supply nozzle
metal supply
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JP2004039494A
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Japanese (ja)
Inventor
Hisahiko Fukase
久彦 深瀬
Shiro Osada
史郎 長田
Hiroyuki Otsuka
裕之 大塚
Atsushi Hirata
淳 平田
Koki Yoshizawa
廣喜 吉澤
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IHI Corp
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IHI Corp
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Application filed by IHI Corp filed Critical IHI Corp
Priority to JP2004039494A priority Critical patent/JP2005230826A/en
Priority to PCT/AU2005/000186 priority patent/WO2005077570A1/en
Priority to US11/057,452 priority patent/US20050211411A1/en
Priority to KR1020067019108A priority patent/KR20070001190A/en
Priority to CNA2005800089885A priority patent/CN1960823A/en
Priority to EP05706236A priority patent/EP1720675A4/en
Priority to JP2006552424A priority patent/JP2008529796A/en
Publication of JP2005230826A publication Critical patent/JP2005230826A/en
Pending legal-status Critical Current

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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

<P>PROBLEM TO BE SOLVED: To provide a nozzle for supplying molten metal, which nozzle can prevent a disturbance of the surface of the molten metal in a molten metal vessel. <P>SOLUTION: A nozzle trough 11 for receiving the molten metal 1 to be supplied between cooling rolls 6 is formed by a pair of longitudinal side walls 15 which intersect so as to make a sharp shape at their lower ends and a pair of end portion walls 19 continued to the longitudinal side walls 15. Apertures 23 passing through from the nozzle trough 11 toward the outside peripheral surfaces of the cooling rolls 6 are provided on the longitudinal side walls 15. Minute bubbles produced in the molten metal basin 10 are introduced upward along the longitudinal side walls 15 and are discharged outside the molten metal vessel 10. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は双ロール鋳造機に組み込む溶湯供給ノズルに関するものである。   The present invention relates to a molten metal supply nozzle incorporated in a twin roll casting machine.

双ロール鋳造機では、溶湯供給ノズルによって一対の冷却ロールの間に溶湯を供給している（例えば、特許文献１参照）。   In the twin roll casting machine, the molten metal is supplied between a pair of cooling rolls by a molten metal supply nozzle (see, for example, Patent Document 1).

図５は特許文献１の溶湯供給ノズルを示すもので、溶湯１を受けるために頂部が開いた細長のノズルトラフ２を、下端寄り部分が徐々に近接し合う一対の長手方向側壁３と、両長手方向側壁３の下端に連なる水平な底部床４と、長手方向側壁３及び底部床４の端部のそれぞれに連なる一対の端部壁５とにより形成している。   FIG. 5 shows a melt supply nozzle disclosed in Patent Document 1. An elongated nozzle trough 2 whose top is opened to receive the melt 1 is paired with a pair of longitudinal side walls 3 whose lower end portions gradually approach each other, The horizontal bottom floor 4 is connected to the lower end of the directional side wall 3, and the pair of end walls 5 are connected to the end portions of the longitudinal side wall 3 and the bottom floor 4.

双ロール鋳造機は、水平に且つ互いに平行に配置した一対の冷却ロール６と、当該冷却ロール６に付帯する一対のサイド堰７とを備えている。   The twin roll casting machine includes a pair of cooling rolls 6 disposed horizontally and parallel to each other, and a pair of side weirs 7 attached to the cooling roll 6.

冷却ロール６は、内部に冷却水が流通可能に形成され、鋳造すべきストリップ８の板厚に応じてロール間隙Ｇを拡縮調整できるようになっている。   The cooling roll 6 is formed so that cooling water can flow therethrough, and the roll gap G can be adjusted in accordance with the thickness of the strip 8 to be cast.

また、冷却ロール６の回転方向及び速度は、それぞれの外周面が上側からロール間隙Ｇへ向かって等速で移動するように設定されている。   Further, the rotation direction and speed of the cooling roll 6 are set so that the respective outer peripheral surfaces move from the upper side toward the roll gap G at a constant speed.

一方のサイド堰７は、各冷却ロール６の一端に面接触し、他方のサイド堰７は、各冷却ロール６の他端に面接触しており、サイド堰７と冷却ロール６で囲まれる空間には、溶湯供給ノズルがロール間隙Ｇの真上に位置するように配置されている。   One side weir 7 is in surface contact with one end of each cooling roll 6, and the other side weir 7 is in surface contact with the other end of each cooling roll 6, and is a space surrounded by the side weir 7 and the cooling roll 6. Is arranged so that the molten metal supply nozzle is located immediately above the roll gap G.

更に、長手方向側壁３の下端寄り部分には、ノズルトラフ２から冷却ロール６外周面へ向かって貫通する開口９が冷却ロール６軸線方向に並ぶように複数穿設してあり、ノズルトラフ２に溶湯１を流し込むと、ロール間隙Ｇの上方に冷却ロール６外周面に接する溶湯溜まり１０が形成される。   Further, a plurality of openings 9 penetrating from the nozzle trough 2 toward the outer peripheral surface of the cooling roll 6 are formed in the portion near the lower end of the longitudinal side wall 3 so as to be aligned in the axial direction of the cooling roll 6. As a result, the molten metal pool 10 that contacts the outer peripheral surface of the cooling roll 6 is formed above the roll gap G.

図５に示す溶湯供給ノズルを組み込んだ双ロール鋳造機では、冷却水の流通により冷却ロール６を抜熱しつつ、上記の溶湯溜まり１０を形成して冷却ロール６を回転させると、冷却ロール６外周面で溶湯１が凝固し、ロール間隙Ｇよりストリップ８が下方へ向かって送り出される。
特開平０９−１０３８５５号公報 In the twin roll casting machine incorporating the molten metal supply nozzle shown in FIG. 5, when the cooling roll 6 is rotated while the cooling roll 6 is removed by circulating the cooling water and the cooling roll 6 is rotated, the outer periphery of the cooling roll 6 The molten metal 1 is solidified on the surface, and the strip 8 is sent downward from the roll gap G.
JP 09-103855 A

ところが、図５のような溶湯供給ノズルを組み込んだ双ロール鋳造機では、溶湯溜まり１０中を上昇してきた大径の気泡が破れてガスが拡散する際に、溶湯溜まり１０の液面が揺らぐという事象が生じる。   However, in the twin roll casting machine incorporating the molten metal supply nozzle as shown in FIG. 5, the liquid level of the molten metal pool 10 fluctuates when the large diameter bubbles rising in the molten metal pool 10 are broken and the gas diffuses. An event occurs.

このため、凝固の不均一に起因した波紋状の縮れがストリップ８の表面に出現したり、波紋に沿った割れがストリップ８の厚みの半分程度にまで達することがある。   For this reason, ripple-shaped fringes resulting from non-uniform solidification may appear on the surface of the strip 8, and cracks along the ripple may reach about half the thickness of the strip 8.

上記の気泡は、溶湯供給ノズルの素材に用いているアルミナグラファイト中の非結晶質炭素や鋼の組成物である炭素が、溶湯１に含まれている酸素、もしくは酸化マンガンなどのスラグと反応して生成される一酸化炭素であると考えられる。   The above bubbles react with the amorphous carbon in the alumina graphite used for the material of the molten metal supply nozzle or the carbon as the steel composition with oxygen contained in the molten metal 1 or slag such as manganese oxide. It is considered to be carbon monoxide produced by

また、気泡が大径になる要因は、水平な底部床４の下側に留まった微細な気泡が徐々に一体化することにあると想定され、均衡が崩れたときに大径の気泡が溶湯溜まり１０中を急速に上昇すると考えられる。   In addition, it is assumed that the bubbles become larger in diameter because the fine bubbles staying under the horizontal bottom floor 4 are gradually integrated, and when the balance is lost, the larger diameter bubbles are melted. It is considered that the inside of the pool 10 rises rapidly.

本発明は上述した実情に鑑みてなしたもので、溶湯溜まり液面の乱れを解消可能な溶湯供給ノズルを提供することを目的としている。   The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a molten metal supply nozzle capable of eliminating the disturbance of the molten metal pool liquid level.

上記目的を達成するため、本発明は、冷却ロールの間に供給すべき溶湯を受けるノズルトラフを、下端寄り部分がロール間隙へ向けて近接し合い且つ下端で交わる一対の長手方向側壁と、該長手方向側壁にそれぞれに連なる一対の端部壁とにより形成し、前記側壁にノズルトラフから冷却ロール外周面に向かって貫通する開口を設けている。   In order to achieve the above object, the present invention provides a nozzle trough that receives molten metal to be supplied between cooling rolls, a pair of longitudinal side walls whose lower end portions are close to the roll gap and intersect at the lower end, and the longitudinal troughs. Each of the side walls is formed by a pair of end walls, and an opening penetrating from the nozzle trough toward the outer peripheral surface of the cooling roll is provided on the side wall.

長手方向側壁の下端部分は、冷却ロール軸線方向に見て尖った形状や、または円弧状に交わらせる。   The lower end portion of the longitudinal side wall intersects with a sharp shape or an arc shape when viewed in the cooling roll axis direction.

長手方向側壁の冷却ロール外周面に相対する面を、ケイ酸アルカリ塩で被覆する。   The surface of the longitudinal side wall facing the outer peripheral surface of the cooling roll is covered with an alkali silicate salt.

長手方向側壁及び端部壁の素材としては、アルミナ、ジルコニア、あるいはマグネシアを用いる。   Alumina, zirconia, or magnesia is used as the material for the longitudinal side wall and the end wall.

本発明においては、長手方向側壁の下端を互いに交わらせて、水平な面を呈しないように尖った形状や円弧状にし、溶湯溜まり中に生じた微小な気泡を長手方向側壁の下端寄り部分に沿わせて上方へ導き、溶湯溜まりの外部へ逃がす。   In the present invention, the lower ends of the longitudinal side walls intersect with each other to have a sharp shape or an arc shape so as not to present a horizontal surface, and minute bubbles generated in the molten metal pool are located near the lower end of the longitudinal side walls. Along the way, lead to the outside and escape to the outside of the molten metal pool.

更に、ケイ酸アルカリ塩の被覆により、長手方向側壁への微小な気泡の付着を抑制する。   Furthermore, adhesion of minute bubbles to the longitudinal side wall is suppressed by the coating of the alkali silicate salt.

アルミナ、ジルコニア、及びマグネシアを素材に用いて、溶湯溜まり内での一酸化炭素の生成を抑制する。   Alumina, zirconia, and magnesia are used as materials to suppress the formation of carbon monoxide in the molten metal pool.

（１）水平な面を呈しないように、一対の長手方向側壁の下端を交わらせたので、溶湯溜まり中に微細な気泡が留まらず、大径の気泡が浮かび上がることに起因した溶湯溜まり表面の乱れを解消でき、よって、ストリップの表面に波紋状の縮れが出現しない。   (1) Since the lower ends of the pair of longitudinal side walls are crossed so as not to present a horizontal surface, the surface of the molten metal pool is caused by the fact that fine bubbles do not stay in the molten metal pool and large-sized bubbles rise. The turbulence of the strip can be eliminated, so that no ripples appear on the surface of the strip.

（２）ケイ酸アルカリ塩で長手方向側壁を被覆することにより、微細な気泡が当該長手方向側壁に付着することを抑制できる。   (2) By covering the longitudinal side wall with an alkali silicate salt, it is possible to prevent fine bubbles from adhering to the longitudinal side wall.

（３）アルミナ、ジルコニア、及びマグネシアのいずれかを素材に用いることにより、溶湯溜まり内での一酸化炭素の生成を抑制できる。   (3) By using any one of alumina, zirconia, and magnesia as a raw material, the production of carbon monoxide in the molten metal pool can be suppressed.

以下、本発明の実施の形態を図面に基づき説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１は本発明の溶湯供給ノズルの実施の形態の第１の例を示すもので、溶湯１を受けるノズルトラフ１１を、下端寄り部分が徐々に近接し合い且つ下端で交わる一対の長手方向側壁１５と、該長手方向側壁１５にそれぞれに連なる一対の端部壁１９とにより形成している。   FIG. 1 shows a first example of an embodiment of a molten metal supply nozzle according to the present invention. A nozzle trough 11 that receives a molten metal 1 has a pair of longitudinal side walls 15 in which the lower end portions gradually approach each other and intersect at the lower end. And a pair of end walls 19 respectively connected to the longitudinal side wall 15.

この溶湯供給ノズルは、双ロール鋳造機のサイド堰７と冷却ロール６で囲まれる空間には、ロール間隙Ｇの真上に位置するように配置されており、長手方向側壁１５の下端寄り部分には、ノズルトラフ１１から冷却ロール６外周面へ向かって貫通する開口２３が冷却ロール６軸線方向に並ぶように複数穿設してあり、ノズルトラフ１１に溶湯１を流し込むと、ロール間隙Ｇの上方に冷却ロール６外周面に接する溶湯溜まり１０が形成される。   The molten metal supply nozzle is disposed in a space surrounded by the side dam 7 and the cooling roll 6 of the twin roll casting machine so as to be positioned immediately above the roll gap G, and is located near the lower end of the longitudinal side wall 15. Is formed with a plurality of openings 23 penetrating from the nozzle trough 11 toward the outer peripheral surface of the cooling roll 6 so that the melt 1 is poured into the nozzle trough 11 and cooled above the roll gap G. A molten metal pool 10 that contacts the outer peripheral surface of the roll 6 is formed.

長手方向側壁１５の下端寄り部分は、冷却ロール６軸線方向に見て直線状、すなわち、傾斜平面となるようにしてあり、その下端が尖った形状を呈して交わっている。   A portion closer to the lower end of the longitudinal side wall 15 is linear when viewed in the axial direction of the cooling roll 6, that is, an inclined plane, and the lower end intersects with a sharp shape.

図１に示す溶湯供給ノズルを組み込んだ双ロール鋳造機では、冷却水の流通により冷却ロール６を抜熱しつつ、上記の溶湯溜まり１０を形成して冷却ロール６を回転させると、冷却ロール６外周面で溶湯１が凝固し、ロール間隙Ｇよりストリップ８が下方へ向かって送り出される。   In the twin roll casting machine incorporating the molten metal supply nozzle shown in FIG. 1, when the cooling roll 6 is rotated by removing the cooling roll 6 by circulating the cooling water and rotating the cooling roll 6, The melt 1 is solidified on the surface, and the strip 8 is fed downward from the roll gap G.

このとき、溶湯溜まり１０で生成された一酸化炭素は、溶湯供給ノズルの長手方向側壁１５に水平な面がないため、溶湯溜まり１０中に留まらずに微小な気泡のままで長手方向側壁１５に沿って上昇する。   At this time, since the carbon monoxide generated in the molten metal reservoir 10 has no horizontal surface on the longitudinal side wall 15 of the molten metal supply nozzle, the carbon monoxide does not stay in the molten metal reservoir 10 and remains in the longitudinal direction side wall 15 as fine bubbles. Ascend along.

従って、大径の気泡が浮かび上がることによる溶湯溜まり１０表面の乱れを解消でき、ストリップ８の表面に波紋状の縮れが出現しない。   Therefore, the disturbance of the surface of the molten metal pool 10 due to the rising of large-diameter bubbles can be eliminated, and the ripple-shaped crimp does not appear on the surface of the strip 8.

図２は本発明の溶湯供給ノズルの実施の形態の第２の例を示すもので、溶湯１を受けるノズルトラフ１２を、下端寄り部分が徐々に近接し合い且つ下端で交わる一対の長手方向側壁１６と、該長手方向側壁１６にそれぞれに連なる一対の端部壁２０とにより形成している。   FIG. 2 shows a second example of the embodiment of the molten metal supply nozzle of the present invention. A nozzle trough 12 that receives the molten metal 1 has a pair of longitudinal side walls 16 in which the lower end portions gradually approach each other and intersect at the lower end. And a pair of end walls 20 respectively connected to the longitudinal side wall 16.

この溶湯供給ノズルは、双ロール鋳造機のサイド堰７と冷却ロール６で囲まれる空間には、ロール間隙Ｇの真上に位置するように配置されており、長手方向側壁１６の下端寄り部分には、ノズルトラフ１２から冷却ロール６外周面へ向かって貫通する開口２４が冷却ロール６軸線方向に並ぶように複数穿設してあり、ノズルトラフ１２に溶湯１を流し込むと、ロール間隙Ｇの上方に冷却ロール６外周面に接する溶湯溜まり１０が形成される。   The molten metal supply nozzle is disposed in a space surrounded by the side weir 7 and the cooling roll 6 of the twin roll casting machine so as to be located immediately above the roll gap G, and is located near the lower end of the longitudinal side wall 16. Is formed with a plurality of openings 24 penetrating from the nozzle trough 12 toward the outer peripheral surface of the cooling roll 6 so that the melt 1 is poured into the nozzle trough 12 and cooled above the roll gap G. A molten metal pool 10 that contacts the outer peripheral surface of the roll 6 is formed.

長手方向側壁１６の下端寄り部分は、冷却ロール６軸線方向に見て直線状、すなわち、傾斜平面となるようにしてあり、その下端が円弧状を呈して交わっている。   A portion closer to the lower end of the longitudinal side wall 16 is linear when viewed in the axial direction of the cooling roll 6, that is, an inclined plane, and the lower ends intersect with each other in an arc shape.

図２に示す溶湯供給ノズルを組み込んだ双ロール鋳造機では、冷却水の流通により冷却ロール６を抜熱しつつ、上記の溶湯溜まり１０を形成して冷却ロール６を回転させると、冷却ロール６外周面で溶湯１が凝固し、ロール間隙Ｇよりストリップ８が下方へ向かって送り出される。   In the twin roll casting machine incorporating the molten metal supply nozzle shown in FIG. 2, when the cooling roll 6 is rotated by removing the cooling roll 6 by circulating the cooling water and rotating the cooling roll 6, the outer periphery of the cooling roll 6 is obtained. The melt 1 is solidified on the surface, and the strip 8 is fed downward from the roll gap G.

このとき、溶湯溜まり１０で生成された一酸化炭素は、溶湯供給ノズルの長手方向側壁１６に水平な面がないため、溶湯溜まり１０中に留まらずに微小な気泡のままで長手方向側壁１６に沿って上昇する。   At this time, the carbon monoxide generated in the molten metal reservoir 10 has no horizontal surface on the longitudinal side wall 16 of the molten metal supply nozzle. Ascend along.

従って、大径の気泡が浮かび上がることによる溶湯溜まり１０表面の乱れを解消でき、ストリップ８の表面に波紋状の縮れが出現しない。   Therefore, the disturbance of the surface of the molten metal pool 10 due to the rising of large-diameter bubbles can be eliminated, and the ripple-shaped crimp does not appear on the surface of the strip 8.

図３は本発明の溶湯供給ノズルの実施の形態の第３の例を示すもので、溶湯１を受けるノズルトラフ１３を、下端寄り部分が徐々に近接し合い且つ下端で交わる一対の長手方向側壁１７と、該長手方向側壁１７にそれぞれに連なる一対の端部壁２１とにより形成している。   FIG. 3 shows a third example of the embodiment of the molten metal supply nozzle of the present invention. A nozzle trough 13 that receives the molten metal 1 has a pair of longitudinal side walls 17 in which the lower end portions gradually approach each other and intersect at the lower end. And a pair of end walls 21 respectively connected to the longitudinal side wall 17.

この溶湯供給ノズルは、双ロール鋳造機のサイド堰７と冷却ロール６で囲まれる空間には、ロール間隙Ｇの真上に位置するように配置されており、長手方向側壁１７の下端寄り部分には、ノズルトラフ１３から冷却ロール６外周面へ向かって貫通する開口２５が冷却ロール６軸線方向に並ぶように複数穿設してあり、ノズルトラフ１３に溶湯１を流し込むと、ロール間隙Ｇの上方に冷却ロール６外周面に接する溶湯溜まり１０が形成される。   This molten metal supply nozzle is disposed in a space surrounded by the side dam 7 and the cooling roll 6 of the twin roll casting machine so as to be positioned immediately above the roll gap G, and is located near the lower end of the longitudinal side wall 17. Is formed with a plurality of openings 25 penetrating from the nozzle trough 13 toward the outer peripheral surface of the cooling roll 6 so that the melt 1 is poured into the nozzle trough 13 and cooled above the roll gap G. A molten metal pool 10 that contacts the outer peripheral surface of the roll 6 is formed.

長手方向側壁１７の下端寄り部分は、冷却ロール６軸線方向に見て円弧状、すなわち、湾曲面となるようにしてあり、その下端が尖った形状を呈して交わっている。   A portion closer to the lower end of the longitudinal side wall 17 is formed in an arc shape, that is, a curved surface when viewed in the axial direction of the cooling roll 6, and intersects with a sharp shape at the lower end.

図３に示す溶湯供給ノズルを組み込んだ双ロール鋳造機では、冷却水の流通により冷却ロール６を抜熱しつつ、上記の溶湯溜まり１０を形成して冷却ロール６を回転させると、冷却ロール６外周面で溶湯１が凝固し、ロール間隙Ｇよりストリップ８が下方へ向かって送り出される。   In the twin roll casting machine incorporating the molten metal supply nozzle shown in FIG. 3, when the cooling roll 6 is rotated by removing the cooling roll 6 by circulating the cooling water and rotating the cooling roll 6, the outer periphery of the cooling roll 6 is obtained. The melt 1 is solidified on the surface, and the strip 8 is fed downward from the roll gap G.

このとき、溶湯溜まり１０で生成された一酸化炭素は、溶湯供給ノズルの長手方向側壁１７に水平な面がないため、溶湯溜まり１０中に留まらずに微小な気泡のままで長手方向側壁１７に沿って上昇する。   At this time, since the carbon monoxide generated in the molten metal reservoir 10 has no horizontal surface on the longitudinal side wall 17 of the molten metal supply nozzle, the carbon monoxide does not stay in the molten metal reservoir 10 and remains in the minute side bubbles 17 in the longitudinal side wall 17. Ascend along.

従って、大径の気泡が浮かび上がることによる溶湯溜まり１０表面の乱れを解消でき、ストリップ８の表面に波紋状の縮れが出現しない。   Therefore, the disturbance of the surface of the molten metal pool 10 due to the rising of large-diameter bubbles can be eliminated, and the ripple-shaped crimp does not appear on the surface of the strip 8.

図４は本発明の溶湯供給ノズルの実施の形態の第４の例を示すもので、溶湯１を受けるノズルトラフ１４を、下端寄り部分が徐々に近接し合い且つ下端で交わる一対の長手方向側壁１８と、該長手方向側壁１８にそれぞれに連なる一対の端部壁２２とにより形成している。   FIG. 4 shows a fourth example of the embodiment of the molten metal supply nozzle according to the present invention. A nozzle trough 14 for receiving the molten metal 1 has a pair of longitudinal side walls 18 where the lower end portions gradually approach each other and intersect at the lower end. And a pair of end walls 22 respectively connected to the longitudinal side wall 18.

この溶湯供給ノズルは、双ロール鋳造機のサイド堰７と冷却ロール６で囲まれる空間には、ロール間隙Ｇの真上に位置するように配置されており、長手方向側壁１８の下端寄り部分には、ノズルトラフ１４から冷却ロール６外周面へ向かって貫通する開口２６が冷却ロール６軸線方向に並ぶように複数穿設してあり、ノズルトラフ１４に溶湯１を流し込むと、ロール間隙Ｇの上方に冷却ロール６外周面に接する溶湯溜まり１０が形成される。   This molten metal supply nozzle is disposed in a space surrounded by the side weir 7 and the cooling roll 6 of the twin roll casting machine so as to be located immediately above the roll gap G, and is located at a portion near the lower end of the longitudinal side wall 18. Is formed with a plurality of openings 26 penetrating from the nozzle trough 14 toward the outer peripheral surface of the cooling roll 6 so that the melt 1 is poured into the nozzle trough 14 and cooled above the roll gap G. A molten metal pool 10 that contacts the outer peripheral surface of the roll 6 is formed.

長手方向側壁１８の下端寄り部分は、冷却ロール６軸線方向に見て円弧状、すなわち、湾曲面となるようにしてあり、その下端が円弧状を呈して交わっている。   A portion closer to the lower end of the longitudinal side wall 18 has an arc shape, that is, a curved surface when viewed in the axial direction of the cooling roll 6, and the lower ends intersect with each other in an arc shape.

図４に示す溶湯供給ノズルを組み込んだ双ロール鋳造機では、冷却水の流通により冷却ロール６を抜熱しつつ、上記の溶湯溜まり１０を形成して冷却ロール６を回転させると、冷却ロール６外周面で溶湯１が凝固し、ロール間隙Ｇよりストリップ８が下方へ向かって送り出される。   In the twin roll casting machine incorporating the molten metal supply nozzle shown in FIG. 4, when the cooling roll 6 is rotated by removing the cooling roll 6 by circulating the cooling water and rotating the cooling roll 6, the outer periphery of the cooling roll 6 is obtained. The melt 1 is solidified on the surface, and the strip 8 is fed downward from the roll gap G.

このとき、溶湯溜まり１０で生成された一酸化炭素は、溶湯供給ノズルの長手方向側壁１８に水平な面がないため、溶湯溜まり１０中に留まらずに微小な気泡のままで長手方向側壁１８に沿って上昇する。   At this time, the carbon monoxide generated in the molten metal reservoir 10 does not have a horizontal surface on the longitudinal side wall 18 of the molten metal supply nozzle. Ascend along.

従って、大径の気泡が浮かび上がることによる溶湯溜まり１０表面の乱れを解消でき、ストリップ８の表面に波紋状の縮れが出現しない。   Therefore, the disturbance of the surface of the molten metal pool 10 due to the rising of large-diameter bubbles can be eliminated, and the ripple-shaped crimp does not appear on the surface of the strip 8.

更に、図１乃至図４に示す長手方向側壁１５，１６，１７，１８の冷却ロール６外周面に相対して溶湯溜まり１０に浸る面をケイ酸アルカリ塩（水ガラス）で被覆しておけば、当該長手方向側壁１５，１６，１７，１８に微細な気泡が付着することを防げる。   Furthermore, if the surfaces of the longitudinal side walls 15, 16, 17, 18 shown in FIGS. 1 to 4 that are immersed in the molten metal pool 10 are coated with alkali silicate (water glass) relative to the outer peripheral surface of the cooling roll 6. Further, fine bubbles can be prevented from adhering to the longitudinal side walls 15, 16, 17, 18.

また、長手方向側壁１５，１６，１７，１８及び端部壁１９，２０，２１，２２の素材にアルミナ、ジルコニア、マグネシアのような炭素を含有しない耐火物を用いれば、溶湯溜まり１０内での一酸化炭素の生成を抑制して気泡発生量の低減を図ることができる。   Further, if a refractory material containing no carbon such as alumina, zirconia, or magnesia is used as the material of the longitudinal side walls 15, 16, 17, 18 and the end walls 19, 20, 21, 22, 22, the inside of the molten metal reservoir 10 The generation of carbon monoxide can be suppressed to reduce the amount of bubbles generated.

なお、本発明の溶湯供給ノズルは、上述した実施の形態のみに限定されるものではなく、本発明の要旨を逸脱しない範囲において変更を加え得ることは勿論である。   In addition, the molten metal supply nozzle of this invention is not limited only to embodiment mentioned above, Of course, it can add in the range which does not deviate from the summary of this invention.

本発明の溶湯供給ノズルは、鋼をはじめとして種々の金属ストリップの製造に適用することができる。   The molten metal supply nozzle of the present invention can be applied to manufacture of various metal strips including steel.

本発明の溶湯供給ノズルの実施の形態の第１の例を示す断面図である。It is sectional drawing which shows the 1st example of embodiment of the molten metal supply nozzle of this invention. 本発明の溶湯供給ノズルの実施の形態の第２の例を示す断面図である。It is sectional drawing which shows the 2nd example of embodiment of the molten metal supply nozzle of this invention. 本発明の溶湯供給ノズルの実施の形態の第３の例を示す断面図である。It is sectional drawing which shows the 3rd example of embodiment of the molten metal supply nozzle of this invention. 本発明の溶湯供給ノズルの実施の形態の第４の例を示す断面図である。It is sectional drawing which shows the 4th example of embodiment of the molten metal supply nozzle of this invention. 従来の溶湯供給ノズルの一例を示す断面図である。It is sectional drawing which shows an example of the conventional molten metal supply nozzle.

符号の説明Explanation of symbols

６ 冷却ロール
１１，１２，１３，１４ ノズルトラフ
１５，１６，１７，１８ 長手方向側壁
１９，２０，２１，２２ 端部壁
２３，２４，２５，２６ 開口
Ｇ ロール間隙 6 Cooling roll 11, 12, 13, 14 Nozzle trough 15, 16, 17, 18 Longitudinal side wall 19, 20, 21, 22, End wall 23, 24, 25, 26 Opening G Roll gap

Claims (7)

冷却ロールの間に供給すべき溶湯を受けるノズルトラフを、下端寄り部分がロール間隙へ向けて近接し合い且つ下端で交わる一対の長手方向側壁と、該長手方向側壁にそれぞれに連なる一対の端部壁とにより形成し、前記側壁にノズルトラフから冷却ロール外周面に向かって貫通する開口を設けたことを特徴とする溶湯供給ノズル。   A nozzle trough that receives the molten metal to be supplied between the cooling rolls, a pair of longitudinal side walls whose lower end portions are close to each other toward the roll gap and intersect at the lower end, and a pair of end walls connected to the longitudinal side walls, respectively. The molten metal supply nozzle is characterized in that an opening penetrating from the nozzle trough toward the outer peripheral surface of the cooling roll is provided on the side wall. 長手方向側壁の下端部分を、冷却ロール軸線方向に見て尖った形状に交わらせた請求項１に記載の溶湯供給ノズル。   The molten metal supply nozzle according to claim 1, wherein the lower end portion of the longitudinal side wall intersects with a sharp shape when viewed in the cooling roll axis direction. 長手方向側壁の下端部分を、冷却ロール軸線方向に見て円弧状に交わらせた請求項１に記載の溶湯供給ノズル。   The molten metal supply nozzle according to claim 1, wherein the lower end portion of the longitudinal side wall intersects in an arc shape when viewed in the cooling roll axis direction. 長手方向側壁の冷却ロール外周面に相対する面を、ケイ酸アルカリ塩で被覆した請求項１乃至請求項３のいずれかに記載の溶湯供給ノズル。   The molten metal supply nozzle in any one of Claim 1 thru | or 3 which coat | covered the surface opposite to the cooling roll outer peripheral surface of a longitudinal direction side wall with an alkali silicate. 長手方向側壁及び端部壁の素材にアルミナを用いた請求項１乃至請求項４のいずれかに記載の溶湯供給ノズル。   The molten metal supply nozzle according to any one of claims 1 to 4, wherein alumina is used as a material for the longitudinal side wall and the end wall. 長手方向側壁及び端部壁の素材にジルコニアを用いた請求項１乃至請求項４のいずれかに記載の溶湯供給ノズル。   The molten metal supply nozzle in any one of Claims 1 thru | or 4 which used the zirconia for the raw material of a longitudinal direction side wall and an edge part wall. 長手方向側壁及び端部壁の素材にマグネシアを用いた請求項１乃至請求項４のいずれかに記載の溶湯供給ノズル。   The molten metal supply nozzle according to claim 1, wherein magnesia is used as a material for the longitudinal side wall and the end wall.
JP2004039494A 2004-02-17 2004-02-17 Nozzle for supplying molten metal Pending JP2005230826A (en)

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PCT/AU2005/000186 WO2005077570A1 (en) 2004-02-17 2005-02-14 A method and apparatus for continuously casting steel strip
US11/057,452 US20050211411A1 (en) 2004-02-17 2005-02-14 Method and apparatus for continuously casting steel strip
KR1020067019108A KR20070001190A (en) 2004-02-17 2005-02-14 A method and apparatus for continuously casting steel strip
CNA2005800089885A CN1960823A (en) 2004-02-17 2005-02-14 A method and apparatus for continuously casting steel strip
EP05706236A EP1720675A4 (en) 2004-02-17 2005-02-14 A method and apparatus for continuously casting steel strip
JP2006552424A JP2008529796A (en) 2004-02-17 2005-02-14 Steel strip continuous casting method and apparatus

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