JP3694389B2 - Powder adhesion prevention method for continuous casting mold - Google Patents
Powder adhesion prevention method for continuous casting mold Download PDFInfo
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- JP3694389B2 JP3694389B2 JP15168697A JP15168697A JP3694389B2 JP 3694389 B2 JP3694389 B2 JP 3694389B2 JP 15168697 A JP15168697 A JP 15168697A JP 15168697 A JP15168697 A JP 15168697A JP 3694389 B2 JP3694389 B2 JP 3694389B2
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Description
【０００１】
【発明の属する技術分野】
本発明は、溶鋼の連続鋳造における鋳型へのパウダ−等の異物の付着を防止し、短辺幅変更時の鋳型表面の摺り疵の発生防止し、鋳型の長寿命化を図るものである。
【０００２】
【従来の技術】
溶鋼等の溶融金属を鋳造する短辺鋳型と長辺鋳型がそれぞれ独立し鋳片幅を変更するために、短辺鋳型が可変する鋳型で溶融金属の連続鋳造を実施する場合、溶融金属と鋳型の間の潤滑を主目的にパウダ−が供給される。
このようなパウダ−は顆粒状、焼結状、あるいは溶融状になって溶鋼に接する鋳型に付着し、前述したように短辺鋳型を移動させた場合には短辺と長辺の間に噛み込み、その結果長辺鋳型表面が摺り疵が発生し、鋳型の寿命が短命となる。
【０００３】
従って鋳型の寿命延長には長辺鋳型に付着したパウダ−を除去することが必要である。このため、従来の技術として、例えば実開昭５９−１８５０４４号公報で提案されている方法を図３を参照して説明する。
図３は鋳型短辺の片側のみを示した平面図であり、短辺鋳型１の摺動面を薄くなし、かつ短辺鋳型１の薄肉部６の開放側に凹陥段部７を設け、この凹陥段部７に開放側にスクレ−パ−８を付設し、且つ、弾性を有するスプリング９により前記スクレーパー８を長辺鋳型２に圧接することで、長辺鋳型２に付着したパウダ−を除去し、付着パウダ−による長辺鋳型２の摺り疵の抑制するものである。なお、図中５はタイボルトせある。
【０００４】
【発明が解決しようとする課題】
鋳型へのパウダー付着は鋳造中における長辺鋳型内側の溶鋼に接する面だけでなく、長辺鋳型の短辺鋳型接触部より後方にも進入し、鋳型下方の鋳片冷却用水の蒸気と混じり合い、長辺鋳型の短辺鋳型接触部より後方の長辺鋳型側の摺動面にも付着する。
長辺鋳型の短辺鋳型接触部より前方側溶鋼と接触面側に付着したパウダ−は、鋳造終了後の次鋳造の準備中毎にオペレ−タ−が完全に除去することから、付着パウダ−が蓄積することは少なく、むしろ長辺鋳型の短辺鋳型接触部後方の長辺鋳型に付着したパウダ−は、短辺鋳型後方の短辺鋳型可変用のシリンダ−や、鋳型冷却水の配管等があり、鋳造終了後の次鋳造準備中に付着パウダ−を完全に除去することは難しく、鋳型交換後に鋳型を分解しなければ完全に除去することはできないため、付着パウダーは徐々に蓄積して行く。
【０００５】
このように従来技術での長辺鋳型に付着したパウダ−をスクレ−パ−により除去する方法では、スクレ−パ−押しつけ力が大きすぎるとスクレ−パ−により長辺鋳型に疵が付き易くなり、反対に押しつけ力が小さすぎると逆にパウダ−を完全に除去できなくなり効果が無くなる恐れがある。
このため、スクレ−パ−の押しつけ力の制御は非常に難しく、しかも、スクレ−パ−自身の磨耗が進行し、常に一定の押しつけ力を確保できない。つまり従来方法ではスクレ−パ−押しつけ力の制御が難しく、逆に摺り疵発生の可能性も高くなる故に、次鋳造の準備作業中にも除去されずに長辺鋳型の短辺鋳型接触部より前方側溶鋼と接触面側に多量に付着したパウダ−をスクレ−パ−で完全に取り除くことは困難であった。
【０００６】
本発明は、上記問題を有することなく、安価に、しかも、簡便、確実に長辺鋳型の短辺鋳型接触部後方へのパウダ−付着を防止することを課題とするものである。
【０００７】
【課題を解決するための手段】
本発明は上記課題を解決するためになされたものである。
【０００８】
相対峙して配置された長辺鋳型間に該長辺鋳型の長手方向に移動可能な短辺鋳型を相対峙して配置した連続鋳造鋳型で溶融金属を連続鋳造するに際し、鋳型に異物除去用スクレーパーを設置せずに短辺鋳型の非溶融金属接触面側の鋳造方向上部と中央部に散水ノズルを配置し、該散水ノズルにより連続鋳造中に前記長辺鋳型の短辺鋳型接触部より後方側面に向けて１．５リットル／分／ｍ ２ 以上、５．５リットル／分／ｍ ２ 未満の水を散水して濡れ壁を形成することを特徴とする連続鋳造用鋳型のパウダ−付着防止方法である。
【０００９】
【発明の実施の形態】
以下に本発明を詳細に説明する。
図１および図２は本発明の実施形態を説明するための図であり、図１は平面図を図２は側面図（鋳型内部よりみた図）をしめした。短辺鋳型１及び長辺鋳型２を相対峙配置させて形成した連続鋳造用鋳型であり、短辺鋳型１が後退、前進することで任意に鋳造巾を設定することが可能である。
この短辺鋳型１後面の非鋳造部に散水ノズル３を配置している。さらにその散水ノズル３は長辺鋳型２の両面に噴射するよう配置する。
【００１０】
散水ノズル３の配置としては、短辺鋳型１には鋳型を摺動するためにシリンダ−４が設置されているために、このシリンダ−により散水ノズル３からの水の散水が阻害されぬよう設置することが必要であり、設備の干渉具合によって、複数のスプレーノズルを設置が望ましい。すなわち図１、図２の例においては、側面図である図２に示すように散水ノズル３は鋳造方向上部と中央部に配置している。
散水ノズル３からは、長辺鋳型１表面を水が流れ落ちる程度の塗れ壁１０が形成するように散水すればよい。このためには単位面積（１ｍ ２ ）当たり１．５リットル／分以上の水量であればよく、５．５リットル／分以上になるとその効果がサチレ−トして不経済となる。好ましくは、前記散水ノズル３から３．０リットル／分〜５．０リットル／分の水を連続鋳造中に散水する。
【００１１】
またパウダ−を使用しない非鋳造中には散水ノズル３からの水の散水を停止するために、鋳型冷却水の戻水を利用することも可能である。
本例は前述したような散水ノズル３により、長辺鋳型２の短辺鋳型１の接触部後方に散水し、長辺鋳型１の表面に濡れ壁１０を形成することで、鋳造中に飛散したパウダ−が短辺鋳型１の後方の非鋳造面の長辺に浮遊しても付着せずに流れ落ちるため、パウダ−が鋳型に付着することを防止できる。その結果、鋳造巾変更時のための短辺鋳型１摺動の際にも長辺鋳型２との摺動部へのパウダ−等の異物噛み込みが抑制されるために、鋳型摺り疵が減少し、寿命がアップが可能になる。
【００１２】
【実施例】
本発明の実施例及び従来技術による鋳型使用平均ヒ−ト回数を図４に示す。
鋳型の使用はブレ−クアウト等の危険性が高く鋳造不能と判断される鋳型表面の摺り疵の深さが１ｍｍまで使用した。
連続鋳造条件は、鋳片サイズが厚２８０mm×巾１０００〜２３００mm、鋳造速度１．５０ｍ／分であり、１ヒ−トで溶鋼量３５０トンを鋳造可能な連続鋳造機を使用した結果である。なお、各水準での鋳型の条件を表１に示す。
【００１３】
【表１】
表１から判るように本実施例１〜４は鋳型使用回数が従来例１、２に比較して大幅に延長している。
また、従来例１では付着パウダ−除去用の対策を施さなかった場合であり、従来例２は図３に示すように従来技術である短辺鋳型１の摺動面を薄くなし、かつ短辺鋳型１の薄肉部６の開放側に凹陥段部７を設け、凹陥段部７のさらに開放側にスクレ−パ−８を付設し、且つ、弾性を有するスプリング９により前記スクレーパー８を長辺鋳型２に圧接した場合であり、いずれも、鋳型使用回数が短縮している。
【００１５】
【発明の効果】
表１に示すように本発明の実施例１〜４はいずれも従来に比べ鋳型使用回数が増加し、使用可能回数が増え寿命が延長した。更に、鋳型交換後の鋳型分解時に長辺鋳型に付着したパウダ−が少ないため、付着バウダ−除去作業も簡便に行うことも可能になるため、整備時間短縮にも効果がある。
【図面の簡単な説明】
【図１】本発明の１例を示す図（平面図）
【図２】本発明の１例を示す図（側面図）
【図３】従来技術の１例を示す図
【図４】各水準による鋳型の使用回数の結果を示した図。
【符号の説明】
１．短辺鋳型
２．長辺鋳型
３．散水ノズル
４．短辺鋳型移動用シリンダ−
５．タイボルト
６．薄肉部
７．凹陥段部
８．スクレーパー
９．スプリング
10．濡れ壁[0001]
BACKGROUND OF THE INVENTION
The present invention is intended to prevent foreign matters such as powder from adhering to a mold in continuous casting of molten steel, to prevent the occurrence of sliding flaws on the mold surface when the short side width is changed, and to extend the life of the mold.
[0002]
[Prior art]
When continuous casting of molten metal is performed using a mold with a variable short-side mold, the short-side mold and long-side mold for casting molten metal such as molten steel are independent of each other and the slab width is changed. The powder is supplied mainly for the purpose of lubrication.
Such powder is granulated, sintered, or melted and adheres to the mold in contact with the molten steel, and when the short side mold is moved as described above, it is bitten between the short side and the long side. As a result, the surface of the long side mold is rubbed and the mold life is shortened.
[0003]
Therefore, it is necessary to remove the powder adhering to the long side mold to extend the mold life. Therefore, as a conventional technique, for example, a method proposed in Japanese Utility Model Publication No. 59-185044 will be described with reference to FIG.
FIG. 3 is a plan view showing only one side of the short side of the mold, the sliding surface of the
[0004]
[Problems to be solved by the invention]
Powder adhering to the mold enters not only the surface in contact with the molten steel inside the long side mold during casting, but also enters behind the short side mold contact part of the long side mold and mixes with the steam for cooling the slab under the mold. Also, it adheres to the sliding surface on the long side mold side behind the short side mold contact portion of the long side mold.
The powder adhering to the front side molten steel and the contact surface side from the short side mold contact part of the long side mold is completely removed by the operator during preparation for the next casting after the end of casting. However, the powder adhering to the long side mold behind the short side mold contact part of the long side mold is a cylinder for changing the short side mold behind the short side mold, the mold cooling water piping, etc. It is difficult to completely remove the adhered powder during the next casting preparation after the casting is completed, and it cannot be completely removed unless the mold is disassembled after the mold replacement. go.
[0005]
Thus, in the method of removing powder adhering to the long-side mold in the prior art with a scraper, if the scraper pressing force is too large, the long-side mold tends to be wrinkled by the scraper. On the other hand, if the pressing force is too small, the powder cannot be completely removed and the effect may be lost.
For this reason, it is very difficult to control the pressing force of the scraper, and the wear of the scraper itself advances, so that a constant pressing force cannot always be secured. In other words, it is difficult to control the scraper pressing force with the conventional method, and on the contrary, the possibility of sliding flaws increases, so it is not removed even during the preparation work for the next casting. It was difficult to completely remove the powder adhering to the front side molten steel and the contact surface side with a scraper.
[0006]
An object of the present invention is to prevent powder adhesion to the rear side of a short-side mold contact portion of a long-side mold at a low cost, in a simple and reliable manner, without having the above-mentioned problems.
[0007]
[Means for Solving the Problems]
The present invention has been made to solve the above problems .
[0008]
When continuously casting molten metal with a continuous casting mold in which a short-side mold movable in the longitudinal direction of the long-side mold is placed between the long-side molds arranged in a relative orientation, for removing foreign matters in the mold Without installing a scraper, water spray nozzles are arranged at the upper and central portions in the casting direction on the non-molten metal contact surface side of the short side mold, and behind the short side mold contact part of the long side mold during continuous casting by the water spray nozzle Prevention of powder adhesion of casting mold for continuous casting, characterized by sprinkling water of 1.5 liters / minute / m 2 or more and less than 5.5 liters / minute / m 2 toward the side surface to form a wet wall Is the method.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The present invention is described in detail below.
1 and 2 are views for explaining an embodiment of the present invention. FIG. 1 is a plan view and FIG. 2 is a side view (viewed from inside a mold). This is a continuous casting mold formed by arranging the
The watering
[0010]
As for the arrangement of the
From the watering
[0011]
Further, in order to stop water spraying from the
In this example, the
[0012]
【Example】
FIG. 4 shows the average number of heating times using the mold according to the embodiment of the present invention and the prior art.
The mold was used up to a depth of 1 mm on the surface of the mold, which has a high risk of breakout and is considered impossible to cast.
The continuous casting conditions are the result of using a continuous casting machine in which the slab size is 280 mm thick x 1000 to 2300 mm wide, the casting speed is 1.50 m / min, and the cast steel can cast 350 tons of molten steel in one heat. Table 1 shows the mold conditions at each level.
[0013]
[Table 1]
As can be seen from Table 1, in Examples 1 to 4, the number of times the mold was used was significantly extended compared to Conventional Examples 1 and 2.
Further, Conventional Example 1 is a case in which no countermeasure for removing the adhered powder is taken, and Conventional Example 2 is that the sliding surface of the conventional short-
[0015]
【The invention's effect】
As shown in Table 1, in each of Examples 1 to 4 of the present invention, the number of times the mold was used was increased, the number of usable times was increased, and the life was extended. Furthermore, since there are few powders adhering to the long side mold at the time of mold disassembly after mold replacement, it is possible to easily perform the adhering powder removing operation, which is effective in shortening the maintenance time.
[Brief description of the drawings]
FIG. 1 is a diagram (plan view) showing an example of the present invention.
FIG. 2 is a diagram (side view) showing an example of the present invention.
FIG. 3 is a diagram showing an example of the prior art. FIG. 4 is a diagram showing the results of the number of times the mold is used according to each level.
[Explanation of symbols]
1. 1.
5.
Ten. Wet wall
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15168697A JP3694389B2 (en) | 1997-05-27 | 1997-05-27 | Powder adhesion prevention method for continuous casting mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15168697A JP3694389B2 (en) | 1997-05-27 | 1997-05-27 | Powder adhesion prevention method for continuous casting mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10323741A JPH10323741A (en) | 1998-12-08 |
| JP3694389B2 true JP3694389B2 (en) | 2005-09-14 |
Family
ID=15524051
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15168697A Expired - Fee Related JP3694389B2 (en) | 1997-05-27 | 1997-05-27 | Powder adhesion prevention method for continuous casting mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3694389B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5566185B2 (en) * | 2010-05-19 | 2014-08-06 | 新日鐵住金株式会社 | Method for preventing powder adhesion of continuous casting mold |
| WO2013100211A1 (en) * | 2011-12-26 | 2013-07-04 | 주식회사 포스코 | Size-variable casting mold |
| JP5770337B2 (en) * | 2014-04-30 | 2015-08-26 | 新日鐵住金株式会社 | Prevention method of oscillation synchronization failure of short casting mold plate for continuous casting |
-
1997
- 1997-05-27 JP JP15168697A patent/JP3694389B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10323741A (en) | 1998-12-08 |
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