JP6000137B2 - Molten steel scattering prevention device - Google Patents
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- JP6000137B2 JP6000137B2 JP2013009295A JP2013009295A JP6000137B2 JP 6000137 B2 JP6000137 B2 JP 6000137B2 JP 2013009295 A JP2013009295 A JP 2013009295A JP 2013009295 A JP2013009295 A JP 2013009295A JP 6000137 B2 JP6000137 B2 JP 6000137B2
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本発明は、連続鋳造装置のブレークアウト時に飛散する溶鋼を捕捉することによって溶鋼の飛散を防止する溶鋼飛散防止装置に関する。 The present invention relates to a molten steel scattering prevention device that prevents molten steel from scattering by capturing molten steel that is scattered during breakout of a continuous casting apparatus.
従来より、連続鋳造方法では、転炉や二次精錬設備等から出鋼された溶鋼を取鍋によってタンディッシュまで搬送し、搬送された取鍋内の溶鋼をタンディッシュへ注入後、このタンディッシュから鋳型へ溶鋼を供給することで、溶鋼を連続的に鋳造している。鋳型へ供給された溶鋼は次第に冷却されて凝固シェルとなり、鋳型の下方側から引き抜かれることになる。係る作業中に希ではあるが、凝固シェルが破断して、未凝固の溶鋼が流出するブレークアウトが発生することがある。ブレークアウトが発生後は、連続鋳造装置の復旧作業を行うことになるが、この復旧作業は大変であり、多大な時間がかかることがある。そこで、希にブレークアウトが発生した場合でも溶鋼の飛散を防止することにより、連続鋳造装置の損傷を抑えると共に復旧作業の負担を軽減する様々な技術（特許文献１，２）が開発されている。 Conventionally, in the continuous casting method, the molten steel produced from the converter, secondary refining equipment, etc. is transported to the tundish with a ladle, and the molten steel in the ladle is poured into the tundish, and then this tundish is used. The molten steel is continuously cast by supplying molten steel to the mold. The molten steel supplied to the mold is gradually cooled to become a solidified shell, which is pulled out from the lower side of the mold. Although rare during such work, the solidified shell may break and a breakout may occur in which unsolidified molten steel flows out. After the breakout occurs, the restoration work of the continuous casting apparatus is performed, but this restoration work is difficult and may take a lot of time. Therefore, various technologies (Patent Documents 1 and 2) have been developed that prevent the molten steel from scattering even in the rare occurrence of breakout, thereby suppressing damage to the continuous casting apparatus and reducing the burden of restoration work. .
特許文献１の地金流出防止装置では、フレーム間に水抜け可能な流下抑制部材を張り、その下端に回転ローラを備えたプロテクターを連鋳機のサポートロールセグメントの内部に取付け、この回転ローラを所定圧力でスラブの短辺に接触させている。
特許文献２の溶融金属流下防止装置では、水抜き孔が形成された耐火物により上部が覆われたトレーと、トレーの一端に設けられたタッチローラーと、タッチローラーが設けられた方向にトレーを水平移動させる駆動部とを備える駆動トレー機構が、モールドに続いて設けられた縦型のローラーエプロンセグメントの対向するフレームの間に、タッチローラーが対向するように設けている。
In the metal spill prevention device of Patent Document 1, a flow control member capable of draining water is stretched between the frames, a protector having a rotating roller at the lower end thereof is attached to the inside of the support roll segment of the continuous casting machine, and the rotating roller is attached. The short side of the slab is brought into contact with a predetermined pressure.
In the molten metal flow prevention device of Patent Document 2, a tray whose upper part is covered with a refractory having a drain hole, a touch roller provided at one end of the tray, and a tray in a direction in which the touch roller is provided. A drive tray mechanism including a horizontally moving drive unit is provided so that the touch rollers are opposed to each other between the opposed frames of the vertical roller apron segments provided after the mold.
特許文献１では、ブレークアウト時の溶鋼の飛散をある程度抑制することができるものの、飛散した溶鋼を絡め取って留めることができないのが実情である。また、特許文献２でも、ブレークアウト時の溶鋼の飛散をある程度は抑えることができるものの、飛散した溶鋼がロールスタンド側へ流れ出ることがあり、溶鋼を絡めとることができないのが実情である。 In patent document 1, although the scattering of the molten steel at the time of a breakout can be suppressed to some extent, the actual situation is that the scattered molten steel cannot be entangled and fastened. Further, even in Patent Document 2, although the scattering of molten steel at the time of breakout can be suppressed to a certain extent, the scattered molten steel may flow out to the roll stand side, and the actual situation is that the molten steel cannot be entangled.
そこで、本発明では、ブレークアウト時に飛散した溶鋼を冷却する冷却部材等の構造を適正化することによって、ブレークアウト時に飛散する溶鋼を捕捉して溶鋼の飛散を防止することができる溶鋼飛散防止装置を提供することを目的とする。 Therefore, in the present invention, by optimizing the structure of a cooling member or the like that cools the molten steel scattered at the breakout, the molten steel scattering prevention device can capture the molten steel scattered at the breakout and prevent the molten steel from scattering. The purpose is to provide.
前記目的を達成するために、本発明は、次の手段を講じた。
即ち、本発明の溶鋼飛散防止装置は、連続鋳造装置のブレークアウト時に飛散する溶鋼を捕捉することによって溶鋼の飛散を防止する溶鋼飛散防止装置であって、前記溶鋼を冷却する複数の冷却部材を備え、前記各冷却部材は前記鋳型の下端に設けられた短辺側のフットロールを支持するフレームに取り付けられており、前記冷却部材に関し、当該冷却部材の下端は、前記連続鋳造装置の鋳型の下端から７００ｍｍ以上の位置とされ、隣接する冷却部材の距離は１０ｍｍ〜４０ｍｍとされ、冷却部材の総断面積が４００ｍｍ２以上とされ、前記鋳片から１０ｍｍ〜５０ｍｍの範囲に設置され、前記フレームと冷却部材との取付部の強度は、前記冷却部材又は冷却部材を連結する連結部材の破断強度以下とされていることを特徴とする。
In order to achieve the above object, the present invention has taken the following measures.
That is, the molten steel scattering preventing device of the present invention is a molten steel scattering preventing device that prevents molten steel from being scattered by capturing molten steel that is scattered during breakout of a continuous casting apparatus, and includes a plurality of cooling members that cool the molten steel. Each cooling member is attached to a frame that supports a foot roll on the short side provided at the lower end of the mold, and with respect to the cooling member, the lower end of the cooling member is a mold of the continuous casting apparatus. 700 mm or more from the lower end, the distance between adjacent cooling members is 10 mm to 40 mm, the total cross-sectional area of the cooling member is 400 mm 2 or more, installed in the range of 10 mm to 50 mm from the slab, The strength of the mounting portion with the cooling member is not more than the breaking strength of the cooling member or the connecting member that connects the cooling member.
また、本発明の他の溶鋼飛散防止装置は、連続鋳造装置のブレークアウト時に飛散する溶鋼を捕捉することによって溶鋼の飛散を防止する溶鋼飛散防止装置であって、前記溶鋼を冷却する一の冷却部材を備え、前記冷却部材は前記鋳型の下端に設けられた短辺側のフットロールを支持するフレームに取り付けられており、前記冷却部材に関し、当該冷却部材の下端は、前記連続鋳造装置の鋳型の下端から７００ｍｍ以上の位置とされ、冷却部材に形成された空隙の大きさは１０ｍｍ〜４０ｍｍとされ、冷却部材の総断面積が４００ｍｍ２以上とされ、前記鋳片から１０ｍｍ〜５０ｍｍの範囲に設置され、前記フレームと冷却部材との取付部の強度は、前記冷却部材の破断強度以下とされていることを特徴とする。 Further, another molten steel scattering preventing device of the present invention is a molten steel scattering preventing device that prevents molten steel from being scattered by capturing molten steel that is scattered during breakout of a continuous casting apparatus, and is a cooling device that cools the molten steel. The cooling member is attached to a frame that supports a foot roll on the short side provided at the lower end of the mold, and the lower end of the cooling member is a mold of the continuous casting apparatus. The position of the gap formed in the cooling member is 10 mm to 40 mm, the total cross-sectional area of the cooling member is 400 mm 2 or more, and is set in the range of 10 mm to 50 mm from the slab. In addition, the strength of the attachment portion between the frame and the cooling member is not more than the breaking strength of the cooling member.
本発明によれば、ブレークアウト時に飛散する溶鋼を確実に捕捉することができ、溶鋼の飛散を防止することができる。 ADVANTAGE OF THE INVENTION According to this invention, the molten steel scattered at the time of a breakout can be capture | acquired reliably, and the scattering of molten steel can be prevented.
本発明の溶鋼飛散防止装置について図を基に説明する。
［第１実施形態］
図１に示すように、溶鋼飛散防止装置１は、取鍋内の溶鋼をタンディッシュを介して鋳型２に注入して溶鋼を鋳造する連続鋳造装置３に取り付けられるものであって、連続鋳造装置３で鋳造中にブレークアウトが発生したときの飛散する溶鋼を捕捉することによって溶鋼の飛散を防止するものである。なお、溶鋼飛散防止装置１を取り付ける連続鋳造装置３は、垂直曲げ型の連続鋳造装置３であっても、垂直部を有さない湾曲型連続鋳造装置３であってもよい。
The molten steel scattering prevention device of the present invention will be described with reference to the drawings.
[First Embodiment]
As shown in FIG. 1, a molten steel scattering prevention device 1 is attached to a continuous casting device 3 that casts molten steel by pouring molten steel in a ladle into a mold 2 through a tundish. 3 prevents the molten steel from being scattered by capturing the molten steel that is scattered when a breakout occurs during casting. The continuous casting device 3 to which the molten steel scattering prevention device 1 is attached may be a vertical bending type continuous casting device 3 or a curved type continuous casting device 3 having no vertical portion.
連続鋳造装置３にて連続鋳造を行った際、鋳型２内の溶鋼は次第に凝固して凝固シェルになるが、希に、凝固シェルが鋳型２内から出たときに破断し、鋳型２の直下に設けられているロール類（ロールスタンド）に溶鋼が飛散することがある。ロール類（ロールスタンド）に溶鋼が飛散した場合、連続鋳造装置３の復旧に多大な時間がかかってしまう。このようなことから、ブレークアウトが発生した場合でも、本発明の溶鋼飛散防止装置１によりロールスタンドに溶鋼が飛散することを防止することとしている。 When continuous casting is performed by the continuous casting apparatus 3, the molten steel in the mold 2 gradually solidifies to become a solidified shell, but rarely breaks when the solidified shell comes out of the mold 2, and immediately below the mold 2. The molten steel may be scattered on the rolls (roll stand) provided in When molten steel scatters on rolls (roll stands), it takes a long time to restore the continuous casting apparatus 3. For this reason, even when a breakout occurs, the molten steel scattering prevention device 1 of the present invention prevents the molten steel from being scattered on the roll stand.
以下、溶鋼飛散防止装置１について詳しく説明する。
図１に示すように、溶鋼飛散防止装置１は、鋳型２の短辺側の直下に設置されたフットロール（短辺フットロールという）５を支持するフレーム（ロールスタンド）６に取り付けられている。
詳しくは、鋳型２の短辺側の両側の直下には、それぞれ短辺フットロール５が設置されている。一方側（紙面左側）に設置された短辺フットロール５ａも、他方側（紙面右側）に設置された短辺フットロール５ｂも、それぞれ鋳型２の短辺側に設置されたフレーム６により支持されている。
Hereinafter, the molten steel scattering prevention device 1 will be described in detail.
As shown in FIG. 1, the molten steel scattering prevention device 1 is attached to a frame (roll stand) 6 that supports a foot roll (referred to as a short-side foot roll) 5 installed immediately below the short side of the mold 2. .
Specifically, short-side foot rolls 5 are respectively provided immediately below both sides of the short side of the mold 2. Both the short side foot roll 5a installed on one side (left side of the drawing) and the short side foot roll 5b installed on the other side (right side of the drawing) are supported by the frame 6 installed on the short side of the mold 2, respectively. ing.
一方側の短辺フットロール５ａ及び他方側の短辺フットロール５ｂは、鋳型２の直下から下側に向けて１本又は複数本設置されている。一方側の短辺フットロール５ａは、鋳型２の左短辺側に設置された第１フレーム６ａに支持され、他方側の短辺フットロール５ｂは、鋳型２の右短辺側に設置された第２フレーム６ｂに支持されている。
第１フレーム６ａの下端部及び第２フレーム６ｂの下端部には、それぞれ溶鋼飛散防止装置１が取り付けられている。なお、連続鋳造装置３において鋳型２の長辺側の直下にもフットロール（長辺フットロール）が設置されているが、本発明の溶鋼飛散防止装置１は短辺フットロール５を支持するフレームに支持されるものであるため、長辺フットロール側の構成は省略する。鋳造方向に並べられた短辺フットロール５の本数は、長辺フットロールの本数よりも少ないものとなっている。即ち、鋳片の短辺側は、長辺側に比べてバルジングが小さいため、短辺フットロール５の本数は、長辺フットロールの本数よりも少なく、鋳型２の直下の限られた範囲に設置されたものとなっている。
One or a plurality of short side foot rolls 5a on one side and short side foot rolls 5b on the other side are installed from directly under the mold 2 to the lower side. The short foot roll 5a on one side is supported by the first frame 6a installed on the left short side of the mold 2, and the short foot roll 5b on the other side is installed on the right short side of the mold 2. It is supported by the second frame 6b.
The molten steel scattering prevention device 1 is attached to the lower end of the first frame 6a and the lower end of the second frame 6b, respectively. In addition, although the foot roll (long side foot roll) is installed also in the continuous casting apparatus 3 just under the long side of the casting_mold | template 2, the molten steel scattering prevention apparatus 1 of this invention is the flame | frame which supports the short side foot roll 5. FIG. Therefore, the configuration on the long side foot roll side is omitted. The number of short side foot rolls 5 arranged in the casting direction is smaller than the number of long side foot rolls. That is, since the short side of the slab has less bulging than the long side, the number of short side foot rolls 5 is smaller than the number of long side foot rolls, and is in a limited range directly below the mold 2. It has been installed.
図２は、様々な溶鋼飛散防止装置１を示したものである。説明の便宜上、図２の上下方向を垂直方向又は縦方向、図２の左右方向を水平方向又は横方向という。したがって、図２の上側から下側に向かう方向は鋳造方向となり、図２の左右方向は、鋳片（スラブ）の短辺方向に沿ったものとなる。溶鋼飛散防止装置１の横方向に直交する方向であって図２の紙面貫通方向は、鋳片（スラブ）の長辺方向に沿ったものとなる。 FIG. 2 shows various molten steel scattering prevention devices 1. For convenience of explanation, the vertical direction in FIG. 2 is referred to as a vertical direction or a vertical direction, and the horizontal direction in FIG. 2 is referred to as a horizontal direction or a horizontal direction. Therefore, the direction from the upper side to the lower side in FIG. 2 is the casting direction, and the left-right direction in FIG. 2 is along the short side direction of the slab. The direction perpendicular to the lateral direction of the molten steel scattering prevention device 1 and the paper surface penetration direction in FIG. 2 is along the long side direction of the slab.
図２に示すように、溶鋼飛散防止装置１は、複数の冷却部材８を備えており、各冷却部材８の形状や配置等によって、チェーン状、団子状、縦短冊状、横短冊状などの複数種類のものがある。
図２（ａ）に示すように、チェーン状の溶鋼飛散防止装置１ａは、金属製であって長鎖環の複数のチェーン（冷却部材）８ａを、横方向（短辺方向）に所定の間隔で並べることにより構成したものである。各チェーン８ａの上端は、フレーム６に溶接され、チェーン８ａはフレーム６に取り付けられている。なお、上側からチェーン８ａを平面視した見たとき、当該チェーン８ａは、図３（ａ）、（ｂ）に示すように、横方向に一直線上に並べてもよいし、短辺方向に加えて長辺方向に並べて全体として千鳥状に配置してもよい。
As shown in FIG. 2, the molten steel scattering prevention device 1 includes a plurality of cooling members 8. Depending on the shape and arrangement of each cooling member 8, a chain shape, a dumpling shape, a vertical strip shape, a horizontal strip shape, etc. There are several types.
As shown in FIG. 2 (a), the chain-shaped molten steel scattering prevention device 1a is made of metal and has a plurality of long-chain rings (cooling members) 8a arranged at predetermined intervals in the lateral direction (short side direction). It is constituted by arranging in order. The upper end of each chain 8 a is welded to the frame 6, and the chain 8 a is attached to the frame 6. In addition, when the chain 8a is viewed from above, the chain 8a may be arranged in a straight line in the lateral direction as shown in FIGS. 3A and 3B, or in addition to the short side direction. You may arrange in a zigzag form as a whole along the long side direction.
図２（ｂ）に示すように、団子状の溶鋼飛散防止装置１ｂは、金属製の球体（冷却部材）８ｂを所定の間隔で縦方向（垂直方向）に並べると共に並べた球体８ｂを連結部材９によって縦方向に連結し、且つ、球体８ｂを連結した連結部材９を横方向に所定の間隔で並べることにより構成したものである。球体８ｂを連結する連結部材９の上端を、フレーム６に溶接することによって球体８ｂ及び連結部材９は当該フレーム６に取り付けられている。 As shown in FIG. 2 (b), the dumpling-shaped molten steel scattering prevention device 1b includes metal spheres (cooling members) 8b arranged in a vertical direction (vertical direction) at predetermined intervals and a sphere 8b arranged in a row. 9, the connecting members 9 connected in the vertical direction and connected to the spheres 8b are arranged at predetermined intervals in the horizontal direction. The upper end of the connecting member 9 that connects the spherical body 8 b is welded to the frame 6, so that the spherical body 8 b and the connecting member 9 are attached to the frame 6.
また、図２（ｃ）に示すように、縦短冊状の溶鋼飛散防止装置１ｃは、縦方向に延びる板状の金属製の縦板材（冷却部材）８ｃを横方向に所定の間隔で並べることにより構成したもので、縦板材８ｃの上端をフレーム６に溶接することにより縦板材８ｃは当該フレーム６に取り付けられている。
さらに、図２（ｄ）に示すように、横短冊状の溶鋼飛散防止装置１ｄは、横方向に延びる板状の金属製の横板材（冷却部材）８ｄを縦方向に所定の間隔で並べ且つ並べた冷却部材８ｄを連結することにより構成したものである。横板材８ｄを連結する連結部材１０の上端をフレーム６に溶接することにより横板材８ｄ及び連結部材１０が当該フレーム６に取り付けられている。
Moreover, as shown in FIG.2 (c), the vertical strip-shaped molten steel scattering prevention apparatus 1c arranges the plate-shaped metal vertical board material (cooling member) 8c extended in a vertical direction at a predetermined space | interval. The vertical plate member 8 c is attached to the frame 6 by welding the upper end of the vertical plate member 8 c to the frame 6.
Further, as shown in FIG. 2 (d), the horizontal strip-shaped molten steel scattering prevention device 1d is arranged with plate-shaped metal horizontal plate materials (cooling members) 8d extending in the horizontal direction at predetermined intervals. It is configured by connecting the cooling members 8d arranged side by side. By welding the upper end of the connecting member 10 that connects the horizontal plate member 8 d to the frame 6, the horizontal plate member 8 d and the connecting member 10 are attached to the frame 6.
次に、溶鋼飛散防止装置１を構成する冷却部材に関して詳しく説明する。
チェーン状、団子状、縦短冊状、横短冊状のいずれの溶鋼飛散防止装置１であっても、冷却部材８の下端は、鋳型２の下端から７００ｍｍ以上の位置に設置されている。
図２に示すように、チェーン状の溶鋼飛散防止装置１ａでは、フレーム６に吊り下げられたチェーン８ａの下端が、鋳型２の下端から縦方向に７００ｍｍ以上離れた位置にある。団子状の溶鋼飛散防止装置１ｂでは、最も下側に位置する球体８ｂであって当該球体８ｂの最外面が、鋳型２の下端から鋳造方向に７００ｍｍ以上離れた位置にある。
Next, the cooling member which comprises the molten steel scattering prevention apparatus 1 is demonstrated in detail.
The lower end of the cooling member 8 is installed at a position 700 mm or more from the lower end of the mold 2 in any of the molten steel scattering prevention device 1 in a chain shape, dumpling shape, vertical strip shape, or horizontal strip shape.
As shown in FIG. 2, in the chain-shaped molten steel scattering prevention device 1 a, the lower end of the chain 8 a suspended from the frame 6 is at a position separated from the lower end of the mold 2 by 700 mm or more in the vertical direction. In the dumpling-shaped molten steel scattering prevention device 1b, the sphere 8b located on the lowermost side and the outermost surface of the sphere 8b is located at a position separated from the lower end of the mold 2 by 700 mm or more in the casting direction.
また、縦短冊状の溶鋼飛散防止装置１ｃでは、フレーム６に吊り下げられた縦板材８ｃの下端が、鋳型２の下端から縦方向に７００ｍｍ以上離れた位置にある。横短冊状の溶鋼飛散防止装置１ｄでは、最も下側に位置する横板材８ｄの下端が、鋳型２の下端から鋳造方向に７００ｍｍ以上離れた位置にある。なお、冷却部材８の下端が連続鋳造装置３の曲げ部に位置する場所にあってもよい。 Further, in the vertical strip-shaped molten steel scattering prevention device 1 c, the lower end of the vertical plate member 8 c suspended from the frame 6 is located at a position separated from the lower end of the mold 2 by 700 mm or more in the vertical direction. In the horizontal strip-shaped molten steel scattering prevention device 1d, the lower end of the lowermost horizontal plate 8d is at a position separated from the lower end of the mold 2 by 700 mm or more in the casting direction. Note that the lower end of the cooling member 8 may be located at a bending portion of the continuous casting apparatus 3.
このように、冷却部材８の下端を、鋳型２の下端から７００ｍｍ以上の以上離れた位置とすれば、ブレークアウト時に鋳片から飛散した溶鋼を溶鋼飛散防止装置１によって受け止め、連続鋳造装置３の外側に位置する設備に達することを防止することができる。一方、冷却部材８の下端が鋳型２の下端から７００ｍｍ未満である場合は、ブレークアウト時に飛散する溶鋼を十分に受け止めることができないため、十分に効果を得ることができない。なお、冷却部材８の設置は、垂直曲げ型の連続鋳造装置３であっても、垂直部を有さない曲げ型連続鋳造装置３であってもよい。また、冷却部材の下端が曲げ部に位置してもよい。 Thus, if the lower end of the cooling member 8 is set at a position more than 700 mm away from the lower end of the mold 2, the molten steel scattered from the slab at the breakout is received by the molten steel scattering prevention device 1, and the continuous casting device 3 Reaching the equipment located outside can be prevented. On the other hand, when the lower end of the cooling member 8 is less than 700 mm from the lower end of the mold 2, the effect cannot be sufficiently obtained because the molten steel scattered at the breakout cannot be sufficiently received. The cooling member 8 may be installed in the vertical bending type continuous casting apparatus 3 or the bending type continuous casting apparatus 3 having no vertical portion. Moreover, the lower end of the cooling member may be located at the bent portion.
また、チェーン状、団子状、縦短冊状、横短冊状のいずれの溶鋼飛散防止装置１であっても、隣接する冷却部材８の距離、即ち、冷却部材８の最短距離Ｌ１を１０ｍｍ〜４０ｍｍの範囲にしている。図２（ａ）に示すように、チェーン状の溶鋼飛散防止装置１ａでは、最も近いチェーン同士の外周面間の最短距離Ｌ１を１０ｍｍ〜４０ｍｍとしている。図３（ｃ）に示すように、団子状の溶鋼飛散防止装置１ｂでは、縦方向に隣接する球体８ｂのうち、最も近い球体８ｂ同士の外周面間の最短距離Ｌ１を１０ｍｍ〜４０ｍｍとしている。なお、縦方向に隣接する球体８ｂの外周面間の距離よりも、横方向に隣接する球体８ｂ同士の外周面間の距離が短い場合は、当該最短距離Ｌ１を１０ｍｍ〜４０ｍｍとしている。図２（ｃ）、（ｄ）に示すように、縦短冊状の溶鋼飛散防止装置１ｃや横短冊状の溶鋼飛散防止装置１ｄでは、横方向又は縦方向に最も近い板材同士の最短距離Ｌ１を１０ｍｍ〜４０ｍｍとしている。 Moreover, even if it is any molten steel scattering prevention apparatus 1 of chain shape, dumpling shape, vertical strip shape, and horizontal strip shape, the distance of the adjacent cooling member 8, ie, the shortest distance L1 of the cooling member 8, is 10 mm-40 mm. It is in range. As shown to Fig.2 (a), in the chain-shaped molten steel scattering prevention apparatus 1a, the shortest distance L1 between the outer peripheral surfaces of the nearest chains is 10 mm-40 mm. As shown in FIG.3 (c), in the dumpling-shaped molten steel scattering prevention apparatus 1b, the shortest distance L1 between the outer peripheral surfaces of the nearest spheres 8b among the spheres 8b adjacent in the vertical direction is set to 10 mm to 40 mm. When the distance between the outer peripheral surfaces of the spheres 8b adjacent in the horizontal direction is shorter than the distance between the outer peripheral surfaces of the spheres 8b adjacent in the vertical direction, the shortest distance L1 is set to 10 mm to 40 mm. As shown in FIGS. 2 (c) and 2 (d), in the vertical strip-shaped molten steel scattering prevention device 1c and the horizontal strip-shaped molten steel scattering prevention device 1d, the shortest distance L1 between the plate members closest to the horizontal direction or the vertical direction is set. 10 mm to 40 mm.
このように、隣接する冷却部材８の距離を１０ｍｍ以上４０ｍｍ以下の範囲にすれば、ブレークアウト時の溶鋼を冷却部材８の間にスムーズに通すことができ、通過中の溶鋼の熱を当該冷却部材８によって効率よく奪って固化することができ、確実に溶鋼を捕捉する（絡め取る）ことができる。
一方、隣接する冷却部材８の距離が１０ｍｍ未満である場合、ブレークアウト時に溶鋼が冷却部材８の間に入り難く、隣接する冷却部材８によって溶鋼の熱を奪うことが難しく、溶鋼を冷却部材８の内側に留めることが難しくなる。また、隣接する冷却部材８の距離が４０ｍｍよりも大きい場合、溶鋼が冷却部材８の間を通過することができるものの、冷却部材８の間で溶鋼を十分に冷却することができず、十分に冷却されなかった溶鋼が冷却部材をつたって外側に出たり、ブレークアウト時の溶鋼が直接外側に出てしまうことがある。
Thus, if the distance of the adjacent cooling member 8 is made into the range of 10 mm or more and 40 mm or less, the molten steel at the time of a breakout can be smoothly passed between the cooling members 8, and the heat | fever of the molten steel in passage is the said cooling The member 8 can be efficiently taken and solidified, and the molten steel can be reliably captured (entangled).
On the other hand, when the distance between the adjacent cooling members 8 is less than 10 mm, it is difficult for the molten steel to enter between the cooling members 8 at the breakout, and it is difficult to take away the heat of the molten steel by the adjacent cooling members 8. It becomes difficult to keep inside. Moreover, when the distance of the adjacent cooling member 8 is larger than 40 mm, although molten steel can pass between the cooling members 8, molten steel cannot fully be cooled between the cooling members 8, and it is enough. In some cases, the molten steel that has not been cooled goes out to the outside through the cooling member, or the molten steel at the time of breakout directly goes out to the outside.
さらに、チェーン状、団子状、縦短冊状、横短冊状のいずれの溶鋼飛散防止装置１であっても、各冷却部材８の断面積を合計した総断面積を４００ｍｍ２以上としている。言い換えれば、各冷却部材８を縦方向及び横方向に断面し、縦方向又は横方向の断面積のうち、断面積が大きい方の各断面積をそれぞれ合計した総断面積を４００ｍｍ２以上としている。 Furthermore, even if it is any molten steel scattering prevention apparatus 1 of chain shape, dumpling shape, vertical strip shape, and horizontal strip shape, the total cross-sectional area which totaled the cross-sectional area of each cooling member 8 shall be 400 mm < 2 > or more. In other words, each cooling member 8 is cross-sectioned in the vertical and horizontal directions, and the total cross-sectional area obtained by adding up the cross-sectional areas having the larger cross-sectional areas among the cross-sectional areas in the vertical and horizontal directions is 400 mm 2 or more. .
チェーン状の溶鋼飛散防止装置１ａでは、各チェーン８ａを縦方向に断面し、その断面積を合計した総断面積が４００ｍｍ２以上となるようにしている。詳しくは、１本のチェーン８ａは複数の環状体１１を連結することにより構成されているが、一本のチェーン８ａを構成する全ての環状体１１の縦方向の断面積を合計することにより１本のチェーン８ａの断面積を求め、チェーン状の溶鋼飛散防止装置１ａを構成する全てのチェーン８ａの断面積の合計を総断面積としている。 In the chain-shaped molten steel scattering prevention device 1a, each chain 8a is sectioned in the vertical direction, and the total sectional area of the total sectional area is 400 mm 2 or more. Specifically, one chain 8a is configured by connecting a plurality of annular bodies 11. However, by adding the cross-sectional areas in the vertical direction of all the annular bodies 11 constituting one chain 8a, 1 The cross-sectional area of the chain 8a is obtained, and the total cross-sectional area of all the chains 8a constituting the chain-shaped molten steel scattering prevention device 1a is defined as the total cross-sectional area.
また、団子状の溶鋼飛散防止装置１ｂでは、縦方向及び横方向に並ぶ各球体８ｂを縦方向に断面し、それぞれの球体８ｂの断面積（中心を通る垂直断面）を合計した総断面積を４００ｍｍ２以上としている。
縦短冊状の溶鋼飛散防止装置１ｃでは、各縦板材８ｃを垂直方向に断面して、それぞれの縦板材８ｃの断面積を合計した総断面積を４００ｍｍ２以上としている。横短冊状の溶鋼飛散防止装置１ｄでは、各横板材８ｄを横方向に断面して、それぞれの横板材８ｄの断面積を合計した総断面積を４００ｍｍ２以上としている。
Further, in the dumpling-shaped molten steel scattering prevention device 1b, the spheres 8b arranged in the longitudinal direction and the transverse direction are sectioned in the longitudinal direction, and the total sectional area obtained by summing the sectional areas (vertical sections passing through the center) of the respective spheres 8b is obtained. 400 mm 2 or more.
In the vertical strip-shaped molten steel scattering prevention device 1c, each vertical plate member 8c is sectioned in the vertical direction, and the total sectional area of the total sectional areas of the respective vertical plate members 8c is 400 mm 2 or more. In the horizontal strip-shaped molten steel scattering prevention device 1d, each horizontal plate member 8d is cross-sectioned in the horizontal direction, and the total sectional area of the total cross-sectional area of each horizontal plate member 8d is 400 mm 2 or more.
このように、各冷却部材８の総断面積を４００ｍｍ２以上とすることにより、溶鋼を冷却する冷却能を十分に確保することができ、ブレークアウト時の溶鋼を冷却することができる。
チェーン状、団子状、縦短冊状、横短冊状のいずれの溶鋼飛散防止装置１であっても、鋳片７からの距離（離間距離）Ｌ３は１０ｍｍ〜５０ｍｍの範囲とされている。即ち、図１に示すように、鋳片７の外周面と冷却部材８の内側面との水平方向の距離（離間距離）Ｌ３を１０ｍｍ〜５０ｍｍとしている。
In this way, by setting the total cross-sectional area of each cooling member 8 to 400 mm 2 or more, it is possible to sufficiently secure the cooling ability for cooling the molten steel, and it is possible to cool the molten steel at the breakout.
The distance (separation distance) L3 from the slab 7 is set to a range of 10 mm to 50 mm in any of the molten steel scattering prevention device 1 in a chain shape, dumpling shape, vertical strip shape, or horizontal strip shape. That is, as shown in FIG. 1, the horizontal distance (separation distance) L3 between the outer peripheral surface of the slab 7 and the inner surface of the cooling member 8 is set to 10 mm to 50 mm.
離間距離Ｌ３が１０ｍｍ未満である場合、連続鋳造において鋳片７の外周面（短片側の外周面）に付着したスケールと、冷却部材８とが接触し易くなり、冷却部材８によって鋳片７の表面にスリ疵を付けてしまう虞がある。一方、離間距離Ｌ３が５０ｍｍを超える場合、鋳片７の表面にスリ疵が付いてしまうことが無くなるものの、冷却部材８と鋳片７とは離れすぎているため、ブレークアウト時に飛散した溶鋼が冷却部材８によって受けることが難しくなる。溶鋼飛散防止装置１による溶鋼の凝固効果が低下することがある。 When the separation distance L3 is less than 10 mm, the scale attached to the outer peripheral surface (the outer peripheral surface on the short piece side) of the slab 7 in continuous casting and the cooling member 8 can easily come into contact with each other. There is a risk of scratching the surface. On the other hand, when the separation distance L3 exceeds 50 mm, the surface of the slab 7 will not be scratched, but since the cooling member 8 and the slab 7 are too far apart, It becomes difficult to receive by the cooling member 8. The solidification effect of the molten steel by the molten steel scattering prevention device 1 may be reduced.
さて、ブレークアウト時が発生した場合は、冷却部材８に溶鋼が付着し凝固することになる。ブレークアウト後は、例えば、鋳片７を鋳型２から引き抜くことによって、溶鋼飛散防止装置１をフレームから取り外すことになるが、溶鋼飛散防止装置１とフレーム６とを取り付ける取付部１７の強度が、冷却部材８の破断強度よりも大きい場合、溶鋼飛散防止装置１をフレームから取り外すのに多大な力が必要となり、溶鋼飛散防止装置１の取り外しが大変となる。それゆえ、溶鋼飛散防止装置１（冷却部材８）とフレームとを取り付ける取付部１７の強度は、ブレークアウト時の冷却部材８と、冷却部材８の冷却によって凝固した凝固物とを支持できる程度とし、取り外しが容易であればよい。本発明では、フレーム６と冷却部材８との取付部１７の強度は、取付部１７に取り付けられている冷却部材８、或いは、取付部１７に取り付けられている連結部材９の破断強度以下としている。取付部１７の強度は、５００ＭＰａから冷却部材８又は連結部材９の破断強度の範囲であることが好ましい。取付部１７の強度が５００ＭＰａより小さい場合は、連続鋳造中（操業中）に溶鋼飛散防止装置１がフレームから取れてしまうことがある。 Now, when breakout occurs, molten steel adheres to the cooling member 8 and solidifies. After the breakout, for example, by pulling out the slab 7 from the mold 2, the molten steel scattering prevention device 1 is removed from the frame, but the strength of the mounting portion 17 for attaching the molten steel scattering prevention device 1 and the frame 6 is When it is larger than the breaking strength of the cooling member 8, a great amount of force is required to remove the molten steel scattering prevention device 1 from the frame, which makes it difficult to remove the molten steel scattering prevention device 1. Therefore, the strength of the mounting portion 17 for attaching the molten steel scattering prevention device 1 (cooling member 8) and the frame is such that the cooling member 8 at the time of breakout and the solidified solidified by cooling of the cooling member 8 can be supported. It is sufficient if removal is easy. In the present invention, the strength of the mounting portion 17 between the frame 6 and the cooling member 8 is equal to or less than the breaking strength of the cooling member 8 attached to the mounting portion 17 or the connecting member 9 attached to the mounting portion 17. . The strength of the mounting portion 17 is preferably in the range of 500 MPa to the breaking strength of the cooling member 8 or the connecting member 9. When the strength of the mounting portion 17 is less than 500 MPa, the molten steel scattering prevention device 1 may be removed from the frame during continuous casting (during operation).
なお、取付部１７は、チェーン状の場合はチェーン８ａの上端部とフレーム６の下端部との溶接した部分（溶接部という）であり、団子状の場合は連結部材９の上端部とフレーム６の下端部との溶接部であり、縦短冊状の場合は縦板材８ｃの上端部とフレーム６の下端部との溶接部であり、横短冊状の場合は連結部材９の上端部とフレームの下端部との溶接部である。 The attachment portion 17 is a welded portion (referred to as a welded portion) between the upper end portion of the chain 8a and the lower end portion of the frame 6 in the case of a chain shape, and the upper end portion of the connecting member 9 and the frame 6 in the case of a dumpling shape. In the case of a vertical strip shape, it is a welded portion between the upper end portion of the vertical plate member 8c and the lower end portion of the frame 6, and in the case of a horizontal strip shape, the upper end portion of the connecting member 9 and the frame It is a welding part with a lower end part.
以上、溶鋼飛散防止装置１によれば、溶鋼を冷却する複数の冷却部材８を備え、各冷却部材８は短辺フットロール５を支持するフレームに取り付けられており、冷却部材８の下端は、鋳型２の下端からの７００ｍｍ以上の位置とされ、隣接する冷却部材８の距離は１０ｍｍ〜４０ｍｍとされ、冷却部材８の総断面積が４００ｍｍ２以上とされ、鋳片７から１０ｍｍ〜５０ｍｍの範囲に設置され、フレームと冷却部材８との取付部１７の強度は、前記冷却部材８又は冷却部材８同士を連結する連結部材９の破断強度以下とされているため、ブレークアウト時の溶鋼を冷却部材８によって効率よく冷却し、溶鋼を素早く絡め取ることができる。即ち、溶鋼飛散防止装置１によって、ブレークアウト時の溶鋼の飛散を低減し、装置への影響を低減することができ、復旧時間の短縮もすることができる。
［第２実施形態］
第１実施形態では、複数の冷却部材８を用いて溶鋼飛散防止装置１を構成していたが、第２実施形態では、１つの冷却部材８を用いて溶鋼飛散防止装置１を構成したものである。
As described above, according to the molten steel scattering prevention device 1, the cooling member 8 includes a plurality of cooling members 8 that cool the molten steel, and each cooling member 8 is attached to a frame that supports the short-side foot roll 5. The position is 700 mm or more from the lower end of the mold 2, the distance between adjacent cooling members 8 is 10 mm to 40 mm, the total cross-sectional area of the cooling member 8 is 400 mm 2 or more, and the range from 10 mm to 50 mm from the slab 7 Since the strength of the mounting portion 17 between the frame and the cooling member 8 is set to be equal to or less than the breaking strength of the cooling member 8 or the connecting member 9 that connects the cooling members 8 together, the molten steel at the time of breakout is cooled. The member 8 can be efficiently cooled and the molten steel can be quickly entangled. That is, the molten steel scattering prevention device 1 can reduce the scattering of molten steel during breakout, reduce the influence on the device, and shorten the recovery time.
[Second Embodiment]
In 1st Embodiment, although the molten steel scattering prevention apparatus 1 was comprised using the some cooling member 8, in 2nd Embodiment, the molten steel scattering prevention apparatus 1 was comprised using one cooling member 8. is there.
図４は、第２実施形態における溶鋼飛散防止装置１を示したものである。
図４に示すように、溶鋼飛散防止装置１は、１つの冷却部材８を備えており、冷却部材８の形状や配置等によって、格子状、穴状などの複数種類のものがある。図４（ａ）に示すように、格子状の溶鋼飛散防止装置１ｅは、金属製の棒材を格子状に形成することによって冷却部材８の全体を構成し、その冷却部材８を溶鋼飛散防止装置１としたものである。詳しくは、左側に傾斜する金属製の第１線材１２を所定の間隔で配置すると共に、右側に傾斜する金属製の第２線材１３を第１線材１２と交差させながら所定の間隔で配置することにより、冷却部材８が構成されている。
FIG. 4 shows the molten steel scattering prevention device 1 in the second embodiment.
As shown in FIG. 4, the molten steel scattering prevention device 1 includes one cooling member 8, and there are a plurality of types such as a lattice shape and a hole shape depending on the shape and arrangement of the cooling member 8. As shown to Fig.4 (a), the lattice-shaped molten steel scattering prevention apparatus 1e comprises the whole cooling member 8 by forming a metal bar in a grid | lattice form, and prevents the molten member 8 from splashing molten steel. The apparatus 1 is used. Specifically, the metal first wire 12 inclined to the left side is arranged at a predetermined interval, and the metal second wire 13 inclined to the right side is arranged at a predetermined interval while intersecting the first wire 12. Thus, the cooling member 8 is configured.
図４（ｂ）に示すように、穴状の溶鋼飛散防止装置１ｆは、金属製の１枚の板材１４に貫通孔１５を複数形成することにより冷却部材８の全体を構成し、その冷却部材８を溶鋼飛散防止装置１としたものである。詳しくは、板材１４の横方向に所定の間隔で貫通孔１５をあけると共に、縦方向に所定の間隔で貫通孔をあけることにより、冷却部材８が構成されている。上下方向に隣接する貫通孔同士の中心は幅方向に互いにずれていて、貫通孔１５は板材１４上に千鳥状に配置されたものとなっている。 As shown in FIG. 4 (b), the hole-shaped molten steel scattering prevention device 1f forms the entirety of the cooling member 8 by forming a plurality of through holes 15 in one metal plate 14, and the cooling member 8 is a molten steel scattering prevention device 1. Specifically, the cooling member 8 is configured by opening the through holes 15 at predetermined intervals in the horizontal direction of the plate member 14 and by forming the through holes at predetermined intervals in the vertical direction. The centers of the through holes adjacent in the vertical direction are shifted from each other in the width direction, and the through holes 15 are arranged on the plate member 14 in a staggered manner.
格子状、穴状のいずれの溶鋼飛散防止装置１であっても、第１実施形態と同様に、冷却部材８の下端は、鋳型２の下端からの７００ｍｍ以上の位置に設置されたものとなっている。詳しくは、格子状の冷却部材８にあっては、第１線材１２及び第２線材１３において最も下側に位置する下端部が鋳型２の下端からの７００ｍｍ以上の位置に設置されている。穴状の冷却部材８にあっては、板材１４の下端部が鋳型２の下端からの７００ｍｍ以上の位置に設置されている。 Regardless of the lattice-shaped or hole-shaped molten steel scattering prevention device 1, the lower end of the cooling member 8 is installed at a position of 700 mm or more from the lower end of the mold 2 as in the first embodiment. ing. Specifically, in the grid-like cooling member 8, the lowermost end portion located on the lowermost side of the first wire 12 and the second wire 13 is installed at a position of 700 mm or more from the lower end of the mold 2. In the hole-shaped cooling member 8, the lower end portion of the plate material 14 is installed at a position of 700 mm or more from the lower end of the mold 2.
また、格子状、穴状のいずれの溶鋼飛散防止装置１であっても、冷却部材８に形成された空隙の大きさＬ２は１０ｍｍ〜４０ｍｍとしている。図５（ａ）に示すように、格子状の溶鋼飛散防止装置１ｅでは、隣接する第１線材１２同士の直線距離ａと、隣接する第２線材１３同士の直線距離ｂのうち、短い方の距離が空隙の大きさＬ２とされ、その空隙の大きさＬ２が１０ｍｍ〜４０ｍｍの範囲内としている。 Moreover, the size L2 of the space | gap formed in the cooling member 8 shall be 10 mm-40 mm even if it is any lattice-shaped and hole-shaped molten steel scattering prevention apparatus 1. As shown in FIG. 5A, in the lattice-shaped molten steel scattering prevention device 1e, the shorter one of the linear distance a between adjacent first wire rods 12 and the linear distance b between adjacent second wire rods 13 is short. The distance is the gap size L2, and the gap size L2 is in the range of 10 mm to 40 mm.
詳しくは、図５（ａ）に示すように、第１線材１２同士の直線距離ａと第２線材１３同士の直線距離ｂとのうち、例えば、第１線材１２同士の直線距離ａが短い場合、その直線距離ａが空隙の大きさＬ２とされ、この直線距離ａが１０ｍｍ〜４０ｍｍの範囲内とされている。図５（ｂ）に示すように、穴状の溶鋼飛散防止装置１ｆでは、板材１４に形成された貫通孔１５が空隙とされ、空隙とされた貫通孔１５の直径が１０ｍｍ〜４０ｍｍの範囲内としている。 Specifically, as shown in FIG. 5A, among the linear distance a between the first wire rods 12 and the linear distance b between the second wire rods 13, for example, the linear distance a between the first wire rods 12 is short. The linear distance a is the gap size L2, and the linear distance a is in the range of 10 mm to 40 mm. As shown in FIG.5 (b), in the hole-shaped molten steel scattering prevention device 1f, the through-hole 15 formed in the board | plate material 14 is made into a space | gap, and the diameter of the through-hole 15 made into the space | gap is in the range of 10 mm-40 mm. It is said.
さらに、格子状、穴状のいずれの溶鋼飛散防止装置１であっても、冷却部材８の断面積を合計した総断面積を４００ｍｍ２以上としている。格子状の溶鋼飛散防止装置１ｅでは、冷却部材８を構成する第１線材１２及び第２線材１３の全ての断面積を合計した値が総断面積となる。穴状の溶鋼飛散防止装置１ｆでは、板材の断面積に貫通孔の断面積を減算して値が総断面積となる。 Furthermore, in any of the lattice-shaped and hole-shaped molten steel scattering prevention device 1, the total cross-sectional area obtained by adding up the cross-sectional areas of the cooling members 8 is 400 mm 2 or more. In the lattice-shaped molten steel scattering prevention device 1e, the total cross-sectional area is a value obtained by adding all the cross-sectional areas of the first wire 12 and the second wire 13 constituting the cooling member 8. In the hole-shaped molten steel scattering prevention device 1f, the cross-sectional area of the through hole is subtracted from the cross-sectional area of the plate material to obtain the total cross-sectional area.
格子状、穴状のいずれの溶鋼飛散防止装置１であっても、鋳片７からの距離（離間距離）Ｌ３は１０ｍｍ〜５０ｍｍの範囲とされている。格子状の溶鋼飛散防止装置１ｅでは、第１線材１２から鋳片７までの距離が離間距離Ｌ３となり、穴状の溶鋼飛散防止装置１ｆでは、板材１４から鋳片７までの距離が離間距離Ｌ３となる。
格子状、穴状のいずれの溶鋼飛散防止装置１であっても、フレーム６と冷却部材８との取付部１７の強度は、冷却部材８の破断強度以下とされている。
Regardless of the lattice-shaped or hole-shaped molten steel scattering prevention device 1, the distance (separation distance) L3 from the slab 7 is in the range of 10 mm to 50 mm. In the lattice-shaped molten steel scattering prevention device 1e, the distance from the first wire 12 to the cast piece 7 is the separation distance L3, and in the hole-shaped molten steel scattering prevention device 1f, the distance from the plate material 14 to the cast piece 7 is the separation distance L3. It becomes.
Regardless of the lattice-shaped or hole-shaped molten steel scattering prevention device 1, the strength of the attachment portion 17 between the frame 6 and the cooling member 8 is set to be equal to or less than the breaking strength of the cooling member 8.
なお、取付部１７は、格子状の場合は第１線材１２及び第２線材１３の上端とフレームの下端部との間の溶接部であり、穴状の場合は板材の上端部とフレームの下端部との溶接部である。
以上、溶鋼飛散防止装置１によれば、冷却部材８はフレームに取り付けられ、冷却部材８の下端は鋳型２の下端からの７００ｍｍ以上の位置とされ、空隙の大きさＬ２は１０ｍｍ〜４０ｍｍ、冷却部材８の総断面積は４００ｍｍ２以上とされ、鋳片７から１０ｍｍ〜５０ｍｍの範囲に設置され、さらに、フレームと冷却部材８との取付部１７の強度は、冷却部材８の破断強度以下とされている。
The attachment portion 17 is a welded portion between the upper ends of the first wire 12 and the second wire 13 and the lower end portion of the frame in the case of a lattice, and the upper end portion of the plate member and the lower end of the frame in the case of a hole shape. It is a welding part with a part.
As described above, according to the molten steel scattering prevention device 1, the cooling member 8 is attached to the frame, the lower end of the cooling member 8 is positioned 700 mm or more from the lower end of the mold 2, and the size L2 of the gap is 10 mm to 40 mm. The total cross-sectional area of the member 8 is 400 mm 2 or more, and is installed in the range of 10 mm to 50 mm from the cast piece 7. Further, the strength of the mounting portion 17 between the frame and the cooling member 8 is less than the breaking strength of the cooling member 8. Has been.
表１は、上述した実施形態における溶鋼飛散防止装置１を形成して鋳造を行った実施例と、本発明の溶鋼飛散防止装置１とは異なる溶鋼飛散防止装置１を用いて鋳造を行った比較例とを示したものである。 Table 1 shows a comparison between an example in which the molten steel scattering prevention device 1 according to the above-described embodiment was formed and cast, and a casting using a molten steel scattering prevention device 1 different from the molten steel scattering prevention device 1 of the present invention. An example is shown.
連続鋳造装置３は、垂直曲げ型のものを用いた。短辺フットロール５の本数は、鋳型２の直下から垂直方向に１つ設けた１段型、３つ設けた３段型、７つ設けた７段型とした。冷却部材８は、格子状、チェーン状、穴状、団子状、縦短冊状、横短冊状のものを用いた。鋳型２の下端から冷却部材８の下端部までの距離は２００ｍｍ〜１７００ｍｍとした。隣接する冷却部材８の最短距離Ｌ１、或いは、空隙の大きさＬ２は、５〜４５ｍｍとした。冷却部材８の総断面積は、０〜５００ｍｍ２とした。冷却部材８と鋳片７との離間距離Ｌ３は、５〜６０ｍｍとした。 The continuous casting apparatus 3 was a vertical bending type. The number of short-side foot rolls 5 was a one-stage type in which one was provided in the vertical direction from directly below the mold 2, a three-stage type in which three were provided, and a seven-stage type in which seven were provided. The cooling member 8 used was a lattice, chain, hole, dumpling, vertical strip, or horizontal strip. The distance from the lower end of the mold 2 to the lower end of the cooling member 8 was 200 mm to 1700 mm. The shortest distance L1 between adjacent cooling members 8 or the size L2 of the gap was set to 5 to 45 mm. The total cross-sectional area of the cooling member 8 was 0 to 500 mm 2 . The separation distance L3 between the cooling member 8 and the slab 7 was 5 to 60 mm.
図６は、溶接による溶鋼飛散防止装置の取り付けについて説明したものである。図６のハッチングは、溶接した部分を示している。図６に示すように、溶鋼飛散防止装置１とフレーム６との取付は、当該溶鋼飛散防止装置１の上側をフレームに１カ所スポット溶接した場合と、溶鋼飛散防止装置１の上端をフレームに３カ所スポット溶接した場合と、溶鋼飛散防止装置１の上端の全面をフレームに溶接した場合との３パターンにした。取付部の強度を４９０〜２４５０Ｎとした。連続鋳造装置の鋳造速度を１．２〜２．０ｍ／ｍｉｎ、溶鋼過熱度を１５〜５０℃、鋼種を４０Ｋ鋼、５０Ｋ鋼、鋳片サイズ を２３０×８００〜１６００ｍｍとした。 FIG. 6 explains the attachment of the molten steel scattering prevention device by welding. The hatching in FIG. 6 shows the welded portion. As shown in FIG. 6, the molten steel scattering prevention device 1 and the frame 6 are attached to the frame when the upper side of the molten steel scattering prevention device 1 is spot-welded to the frame, and the upper end of the molten steel scattering prevention device 1 is attached to the frame 3. Three patterns were used: spot welding at the spot, and welding the entire upper end of the molten steel scattering prevention device 1 to the frame. The strength of the mounting portion was 490 to 2450N. The casting speed of the continuous casting apparatus was 1.2 to 2.0 m / min, the molten steel superheat degree was 15 to 50 ° C., the steel types were 40K steel and 50K steel, and the slab size was 230 × 800 to 1600 mm.
実施例及び比較例において、ブレークアウトが発生した時に連続鋳造装置の外側（溶鋼飛散防止部材よりも外側）に溶鋼が飛散したが否かを判定した。飛散防止効果の欄に示すように、溶鋼が溶鋼飛散防止装置内で止まった場合を良好「○」とした。また、冷却部材８をつたって下に飛散した場合、冷却部材の下部より溶鋼が飛散した場合、冷却部材の隙間から飛散した場合、操業中に冷却部材が切断されてしまった（ちぎれた）場合を不良「×」とした。 In Examples and Comparative Examples, when breakout occurred, it was determined whether or not molten steel was scattered outside the continuous casting apparatus (outside the molten steel scattering prevention member). As shown in the column of the scattering prevention effect, the case where the molten steel stopped in the molten steel scattering prevention device was evaluated as “good”. In addition, when the cooling member 8 is sprinkled down, the molten steel is spattered from the lower part of the cooling member, the spattered from the gap of the cooling member, or the cooling member is cut (broken) during operation Was determined to be defective “x”.
また、ブレークアウトの発生後の復旧時（鋳片を再引き抜き時）にロールスタンドに対する影響の有無を判定した。設備損傷の欄に示すように、フットロールスタンドが破断した場合、フットロールスタンドが変形した場合を不良「×」とし、鋳片の再引き抜き時にフットロールに影響が無かった場合を良好「○」とした。
さらに、溶鋼飛散防止装置１を設けることにより鋳片の表面にスリ疵が発生しなかったか否かを判定した。図８及び鋳片スリ疵の欄に示すように、鋳片の表面に線状の欠陥が発生した場合を不良「×」とし、線状の欠陥が発生しなかった場合を良好「○」とした。
Moreover, the presence or absence of the influence with respect to a roll stand was determined at the time of recovery after breakout occurrence (at the time of redrawing a slab). As shown in the column of equipment damage, when the foot roll stand breaks, the case where the foot roll stand is deformed is judged as bad `` x '', and when the slab is drawn again, the foot roll is not affected. It was.
Furthermore, it was determined by providing the molten steel scattering prevention device 1 whether or not a flaw occurred on the surface of the slab. As shown in FIG. 8 and the slab surface, the case where a linear defect occurs on the surface of the slab is defined as a failure “x”, and the case where a linear defect does not occur is indicated as “good”. did.
実施例１３〜１７によれば、冷却部材８の下端を鋳型２の下端から７００ｍｍ以上の位置にし（鋳型下からの距離の欄）、隣接する冷却部材８の距離を１０ｍｍ〜４０ｍｍとし（隣接する最短距離の欄）、冷却部材８の総断面積を４００ｍｍ２以上とし（断面積の欄）、鋳片７から１０ｍｍ〜５０ｍｍの範囲に設置し（鋳片からの距離の欄）、フレームと冷却部材８との取付部１７の強度は、冷却部材８又は冷却部材８を連結する連結部材９の破断強度以下（取付部の強度及び破断強度の欄）としているため、溶鋼の飛散防止、設備保護ができ、鋳片７にスリ疵を付けることもなかった（評価結果の欄）。 According to Examples 13 to 17, the lower end of the cooling member 8 is set to a position of 700 mm or more from the lower end of the mold 2 (distance column from below the mold), and the distance between the adjacent cooling members 8 is set to 10 mm to 40 mm (adjacent). (Shortest distance column), the total cross-sectional area of the cooling member 8 is 400 mm 2 or more (cross-sectional area column), and is installed in the range of 10 mm to 50 mm from the slab 7 (distance column from the slab), frame and cooling The strength of the mounting portion 17 with the member 8 is less than or equal to the breaking strength of the cooling member 8 or the connecting member 9 that connects the cooling member 8 (columns of strength and breaking strength of the mounting portion). The slab 7 was not attached to the slab 7 (evaluation result column).
また、実施例１８〜２３によれば、冷却部材８の下端の位置、空隙の大きさ（隣接する最短距離の欄）、冷却部材８の総断面積、鋳片７からの距離、取付部１７の強度のいずれも、本発明に規定した範囲内となっているため、溶鋼の飛散防止や設備の保護ができ、鋳片７のスリ疵も発生することもなかった。
一方、比較例１〜１２によれば、冷却部材８の下端の位置、冷却部材８間の距離或いは空隙の大きさ、冷却部材８の総断面積、鋳片７からの距離、取付部１７の強度のいずれかが本発明に規定した条件外となっていたため、評価結果の欄に示すように、溶鋼の飛散防止や設備保護ができないことがあり、鋳片７にスリ疵が発生することもあった。
Further, according to Examples 18 to 23, the position of the lower end of the cooling member 8, the size of the gap (adjacent shortest distance column), the total cross-sectional area of the cooling member 8, the distance from the slab 7, and the mounting portion 17. Since both of the strengths are within the range defined in the present invention, the molten steel can be prevented from scattering and the equipment can be protected, and no slabs of the slab 7 are generated.
On the other hand, according to Comparative Examples 1 to 12, the position of the lower end of the cooling member 8, the distance between the cooling members 8 or the size of the gap, the total cross-sectional area of the cooling member 8, the distance from the slab 7, Since one of the strengths was outside the conditions specified in the present invention, as shown in the evaluation result column, it may not be possible to prevent molten steel from being scattered or to protect the equipment, and a slab may be generated in the slab 7. there were.
なお、今回開示された実施形態において、明示的に開示されていない事項、例えば、運転条件や操業条件、各種パラメータ、構成物の寸法、重量、体積などは、当業者が通常実施する範囲を逸脱するものではなく、通常の当業者であれば、容易に想定することが可能な事項を採用している。溶鋼飛散防止装置１は、上述したチェーン状、団子状、縦短冊状、横短冊状、格子状、穴状に限定されず、他の形状であってもよい。図７に示すように、山型の２枚の冷却部材８を並べて、並列した冷却部材８を連結することにより溶鋼飛散防止装置１を構成してもよい。この場合は、冷却部材８の間が空隙の大きさＬ２となる。或いは、１枚の冷却部材８に鋸波状の溝（ギザギザ溝）を設けることにより溶鋼飛散防止装置１を構成してもよい。 It should be noted that matters not explicitly disclosed in the embodiment disclosed this time, such as operating conditions and operating conditions, various parameters, dimensions, weights, volumes, and the like of a component, deviate from the range normally practiced by those skilled in the art. However, matters that can be easily assumed by those skilled in the art are employed. The molten steel scattering prevention device 1 is not limited to the above-described chain shape, dumpling shape, vertical strip shape, horizontal strip shape, lattice shape, or hole shape, but may be other shapes. As shown in FIG. 7, the molten steel scattering prevention device 1 may be configured by arranging two mountain-shaped cooling members 8 and connecting the parallel cooling members 8. In this case, the gap L2 is between the cooling members 8. Or you may comprise the molten steel scattering prevention apparatus 1 by providing the saw-tooth-like groove | channel (gagged groove | channel) in the cooling member 8 of 1 sheet.
１ 溶鋼飛散防止装置
２ 鋳型
３ 連続鋳造装置
５ 短辺フットロール
５ａ 一方側の短辺フットロール
５ｂ 他方側の短辺フットロール
６ フレーム
６ａ 第１フレーム
６ｂ 第２フレーム
７ 鋳片
８ 冷却部材
８ａ チェーン
８ｂ 球体
８ｃ 縦板材
８ｄ 横板材
９ 連結部材
１０ 連結部材
１１ 環状体
１２ 第１線材
１３ 第２線材
１４ 板材
１５ 貫通孔
１７ 取付部
Ｌ１ 最短距離
Ｌ２ 空隙の大きさ
DESCRIPTION OF SYMBOLS 1 Molten steel splash prevention apparatus 2 Mold 3 Continuous casting apparatus 5 Short side foot roll 5a Short side foot roll 5b on one side Short side foot roll 6 on the other side 6 Frame 6a First frame 6b Second frame 7 Cast piece 8 Cooling member 8a Chain 8b Sphere 8c Vertical plate member 8d Horizontal plate member 9 Connecting member 10 Connecting member 11 Annular body 12 First wire member 13 Second wire member 14 Plate member 15 Through hole 17 Mounting portion L1 Shortest distance L2 Size of gap
Claims (2)
前記溶鋼を冷却する複数の冷却部材を備え、前記各冷却部材は前記鋳型の下端に設けられた短辺側のフットロールを支持するフレームに取り付けられており、
前記冷却部材に関し、当該冷却部材の下端は、前記連続鋳造装置の鋳型の下端から７００ｍｍ以上の位置とされ、隣接する冷却部材の距離は１０ｍｍ〜４０ｍｍとされ、冷却部材の総断面積が４００ｍｍ２以上とされ、前記鋳片から１０ｍｍ〜５０ｍｍの範囲に設置され、前記フレームと冷却部材との取付部の強度は、前記冷却部材又は冷却部材を連結する連結部材の破断強度以下とされていることを特徴とする溶鋼飛散防止装置。 A molten steel scattering prevention device for preventing molten steel from being scattered by capturing molten steel scattered during breakout of a continuous casting apparatus,
It comprises a plurality of cooling members for cooling the molten steel, each cooling member is attached to a frame that supports a foot roll on the short side provided at the lower end of the mold,
Regarding the cooling member, the lower end of the cooling member is at a position 700 mm or more from the lower end of the mold of the continuous casting apparatus, the distance between adjacent cooling members is 10 mm to 40 mm, and the total cross-sectional area of the cooling member is 400 mm 2 or more. It is installed in the range of 10 mm to 50 mm from the slab, and the strength of the mounting portion between the frame and the cooling member is set to be equal to or less than the breaking strength of the connecting member that connects the cooling member or the cooling member. A feature to prevent molten steel scattering.
前記溶鋼を冷却する一の冷却部材を備え、前記冷却部材は前記鋳型の下端に設けられた短辺側のフットロールを支持するフレームに取り付けられており、
前記冷却部材に関し、当該冷却部材の下端は、前記連続鋳造装置の鋳型の下端から７００ｍｍ以上の位置とされ、冷却部材に形成された空隙の大きさは１０ｍｍ〜４０ｍｍとされ、冷却部材の総断面積が４００ｍｍ２以上とされ、前記鋳片から１０ｍｍ〜５０ｍｍの範囲に設置され、前記フレームと冷却部材との取付部の強度は、前記冷却部材の破断強度以下とされていることを特徴とする溶鋼飛散防止装置。 A molten steel scattering prevention device for preventing molten steel from being scattered by capturing molten steel scattered during breakout of a continuous casting apparatus,
Comprising one cooling member for cooling the molten steel, the cooling member is attached to a frame that supports a foot roll on the short side provided at the lower end of the mold,
Regarding the cooling member, the lower end of the cooling member is at a position of 700 mm or more from the lower end of the mold of the continuous casting apparatus, and the size of the gap formed in the cooling member is 10 mm to 40 mm. Molten steel having an area of 400 mm2 or more, installed in a range of 10 mm to 50 mm from the cast slab, and the strength of the mounting portion between the frame and the cooling member being equal to or less than the breaking strength of the cooling member Anti-scattering device.
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| BE788995A (en) * | 1971-09-20 | 1973-01-15 | Voest Ag | DEVICE SERVING TO FACILITATE THE FLOW OF CASTING IN CONTINUOUS CASTING PLANTS |
| AT322757B (en) * | 1972-08-17 | 1975-06-10 | Voest Ag | PROTECTIVE DEVICE FOR PREVENTING DAMAGE TO A CONTINUOUS CASTING PLANT |
| JPS5194422A (en) * | 1975-02-19 | 1976-08-19 | ||
| JPS55122958U (en) * | 1979-02-16 | 1980-09-01 | ||
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| JPS6267651U (en) * | 1985-10-18 | 1987-04-27 | ||
| JPH03291130A (en) * | 1990-04-09 | 1991-12-20 | Nippon Stainless Steel Co Ltd | Method for continuously casting stainless steel |
| JPH07136750A (en) * | 1993-11-18 | 1995-05-30 | Nippon Steel Corp | Breakout protection device for thin cast continuous casting machine |
| JP4325452B2 (en) * | 2004-03-22 | 2009-09-02 | Ｊｆｅスチール株式会社 | Supporting guide method for short side of slab directly under continuous casting mold |
| JP2007245213A (en) * | 2006-03-17 | 2007-09-27 | Jfe Steel Kk | Method and apparatus for pulverizing molten steel flowing out by breakout during continuous casting |
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