JPH06292951A - Method for completing pouring of molten steel in tundish and device therefor - Google Patents
Method for completing pouring of molten steel in tundish and device thereforInfo
- Publication number
- JPH06292951A JPH06292951A JP10489893A JP10489893A JPH06292951A JP H06292951 A JPH06292951 A JP H06292951A JP 10489893 A JP10489893 A JP 10489893A JP 10489893 A JP10489893 A JP 10489893A JP H06292951 A JPH06292951 A JP H06292951A
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- mold
- tundish
- ladle
- pouring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Landscapes
- Continuous Casting (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、鋼の連続鋳造において
タンディッシュ(以下TD)内溶鋼の鋳型への注入終了
を行う方法と装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for finishing casting of molten steel in a tundish (TD) into a mold in continuous casting of steel.
【0002】[0002]
【従来の技術】連続鋳造におけるTDから鋳型への溶鋼
の注入終了は、一般にはTD内溶鋼を完全に注入してT
Dスラグが鋳型内へ流出した直後にTDノズルを閉止し
て行われる。この場合、TD内溶鋼を残さず注入し且つ
TDスラグの流出量を最小限に抑えることが、鋳造歩留
向上や作業性向上のための基本条件である。2. Description of the Related Art In the continuous casting, the injection of the molten steel from the TD into the mold is generally completed by completely injecting the molten steel in the TD.
This is performed by closing the TD nozzle immediately after the D slag flows out into the mold. In this case, it is a basic condition to improve the casting yield and workability by injecting the molten steel in the TD without leaving it and minimizing the outflow amount of the TD slag.
【0003】従来の方法では、TD内残溶鋼量の把握は
ロードセルなどの秤量器や検尺棒で測定し、最終的な注
入終了はオペレーターがTDスラグの鋳型内流出を直に
目視確認することによりなされている。In the conventional method, the amount of residual molten steel in the TD is grasped by measuring with a weighing machine such as a load cell or a measuring rod, and at the end of the final injection, the operator directly visually confirms the outflow of the TD slag into the mold. Is done by.
【0004】これらの方法では誤差があり、TD内に重
量で数トンの溶鋼が残ったり、或は銭型内に相当量のT
Dスラグが流出するため、鋳造歩留の低下や鋳型内スラ
グの除去作業に時間を要し問題である。There is an error in these methods, and several tons of molten steel remains in the TD, or a considerable amount of T remains in the coin mold.
Since the D slag flows out, it takes a long time to reduce the casting yield and remove the slag in the mold, which is a problem.
【0005】[0005]
【発明が解決しようとする課題】上記のようにTD内残
湯量の把握を秤量器や検尺棒で行い、最終的な注入終了
をTDスラグの鋳型内への流出確認を目視により行う方
法では、TD内壁への付着地金や残留スラグにより影響
を受け易い。As described above, in the method in which the amount of residual hot water in the TD is grasped by a scale or a measuring rod, and the final injection is visually confirmed by the outflow confirmation of the TD slag. , TD is easily affected by the metal attached to the inner wall and residual slag.
【0006】また、鋳型内溶鋼表面上には鋳造用のパウ
ダーが数10mmの厚さで存在するために、TDスラグ
が流出しても目視確認しにくいため、オペレーターがス
ラグ注出を確認してTDノズルを閉止するまでには、相
当の動作時間がかかることから、多量のTDスラグが鋳
型内へ流出し易する問題がある。[0006] Moreover, since the powder for casting is present on the surface of the molten steel in the mold with a thickness of several tens of mm, it is difficult to visually confirm even if the TD slag flows out. Therefore, the operator confirms the slag pouring out. Since it takes a considerable operating time to close the TD nozzle, there is a problem that a large amount of TD slag easily flows out into the mold.
【0007】多量のスラグの流出は、スラグの除去に労
力と時間を要するばかりか、先鍋の溶鋼注入を終了し引
き続いて後鍋の溶鋼を異鋼種連々鋳する場合には、鋳片
の継目部に巻き込まれたスラグがブレークアウトの原因
になる危険性がある。The outflow of a large amount of slag not only requires labor and time to remove the slag, but also when the molten steel in the first ladle is finished and the molten steel in the second ladle is subsequently cast in succession with different steel types, the seam of the slab is There is a risk that the slag caught in the part will cause a breakout.
【0008】上記問題点を防ぐためには、先鍋の溶鋼の
一部(数トン)をTD内へ計画的に残し、後鍋の溶鋼を
TDに注入して連々鋳を行う方法(「TD湯混ざり型異
鋼種連々鋳法」)では、異鋼種同志の場合には異なる成
分がTD内で混合し、先鍋にも後鍋にも適合しない成分
の鋳片が大量に(TD内残湯量の数倍程度)発生する問
題点がある。In order to prevent the above problems, a method of intentionally leaving a part (several tons) of the molten steel in the first ladle in the TD and injecting the molten steel in the rear ladle into the TD for continuous casting ("TD hot water") In the mixed type different steel type continuous casting method "), different components are mixed in the TD in the case of different steel types, and a large amount of slabs of components that are not compatible with the first ladle and the second ladle ( There is a problem that occurs.
【0009】上記問題点を解決するためには、先鍋の溶
鋼をTD内に極力残さず且つTDスラグの鋳型内への流
出を最小限に抑える方法及び装置の確立が必要である。In order to solve the above-mentioned problems, it is necessary to establish a method and an apparatus for keeping the molten steel of the pan in the TD as little as possible and minimizing the outflow of the TD slag into the mold.
【0010】[0010]
【課題を解決するための手段】本発明は、前記課題を解
決する方法と装置を提供するものである。SUMMARY OF THE INVENTION The present invention provides a method and apparatus for solving the above problems.
【0011】即ち、本発明は、取鍋からTDへの溶鋼注
入を終了した鋳造末期において、鋳型内湯面レベル計の
指示値を監視しながら鋳造し、該湯面レベル計の指示値
が急激に低下した瞬間を、TDから鋳型内への溶鋼の注
入が終了したものと判定してタンディッシュ注入ノズル
を閉止する方法と装置である。That is, according to the present invention, in the final stage of casting after the molten steel injection from the ladle to the TD is completed, casting is performed while monitoring the indicated value of the level gauge in the mold, and the indicated value of the level gauge suddenly increases. It is a method and an apparatus for closing the tundish injection nozzle by judging that the injection of the molten steel from the TD into the mold is completed at the moment when the temperature falls.
【0012】本発明になる注入終了装置を図1に示し、
以下に図に基ずいて詳細に説明する。1はTD、2はス
トッパーノズル、3はストッパー支持アーム、4はスト
ッパー駆動装置、5は溶鋼、6はTDスラグ、7は浸漬
ノズル、8は鋳型、9は鋳片、10はピンチロール、1
1は鋳型内湯面レベル計、12は鋳型内湯面レベル演算
及び湯面レベル急速低下検知装置、13は取鍋注入終了
入力装置、14はTD注入終了出力装置、15は警報装
置、16はストッパー駆動制御装置である。An injection termination device according to the present invention is shown in FIG.
A detailed description will be given below with reference to the drawings. 1 is TD, 2 is a stopper nozzle, 3 is a stopper support arm, 4 is a stopper driving device, 5 is molten steel, 6 is TD slag, 7 is a dipping nozzle, 8 is a mold, 9 is a slab, 10 is a pinch roll, 1
1 is a level meter in the mold, 12 is a device for calculating the level in the mold and a device for detecting a rapid decrease in the level, 13 is a ladle injection end input device, 14 is a TD injection end output device, 15 is an alarm device, 16 is a stopper drive It is a control device.
【0013】本発明で用いる湯面レベル計としては、高
感度で高応答性のものであれば良く、渦流式、γ線方
式、レーザー方式などが望ましい。The molten metal level meter used in the present invention may be any one having a high sensitivity and a high response, and a vortex type, a γ-ray type, a laser type or the like is preferable.
【0014】取鍋注入終了入力装置への入力方法は、取
鍋からTDへの溶鋼注入が終了した時点でオペレータが
入力するか、取鍋の重量検出、或は取鍋スラグ流出検知
等により自動的に入力するものとしてもよい。The input method to the ladle pouring end input device is input by the operator at the time when the molten steel pouring from the ladle to the TD is completed, or automatically by detecting the weight of the ladle or detecting the outflow of the ladle slag. It may be input manually.
【0015】図1は本発明になる連続鋳造の最終チャー
ジの鋳造終了法「オートストップ法」を示す図である。FIG. 1 is a diagram showing a casting termination method "auto stop method" of the final charge of continuous casting according to the present invention.
【0016】即ち、取鍋注入終了入力装置13から取鍋
注入終了信号が入力された後の鋳造末期において、鋳型
内湯面レベル演算及び湯面レベル急速低下検知装置12
にて湯面レベル変化率を演算し一定以上の変化率を検出
した場合に、前記TD注入終了出力装置14から、警報
装置15並びにストッパー駆動制御装置16に操作指令
を出力し、ストッパー駆動装置4及びストッパー指示ア
ーム3を介して、ストッパーノズル2を自動的に閉止す
る鋳造終了方法である。That is, at the end of casting after the ladle pouring end signal is input from the ladle pouring end input device 13, the molten metal level calculation in the mold and the rapid molten metal level detection device 12 are performed.
When the level change rate of the molten metal surface is calculated and the rate of change above a certain level is detected, the TD injection end output device 14 outputs an operation command to the alarm device 15 and the stopper drive control device 16, and the stopper drive device 4 And a method of ending casting in which the stopper nozzle 2 is automatically closed via the stopper instruction arm 3.
【0017】図2には、同一TDを用いて溶鋼成分の異
なる異鋼種の連々鋳を行うに際し、先鍋の鋳造末期に湯
面レベル演算装置12にて湯面レベル変化率を演算し一
定以上の変化率を検出した場合に、前記TD注入終了出
力装置14から、警報装置15並びにストッパー駆動制
御装置16、ピンチロール駆動制御装置17に操作指令
を出力して、ストッパーノズル2を自動的に閉止すると
共に鋳片9の引抜を一旦停止し、次いで取鍋ノズル駆動
制御装置18に操作指令を出力し後鍋20の溶鋼を取鍋
ノズル駆動装置19によりTD1へ注入開始して鋳型8
への注入と鋳片9の引抜を再開する異鋼種連々鋳法を示
す。この方法は、「鋳型内湯混ざり型異鋼種連々鋳法」
である。In FIG. 2, when performing continuous casting of different steel types having different molten steel components using the same TD, the rate of change of the molten metal level is calculated by the molten metal level calculation device 12 at the end of casting of the ladle, and the molten metal level change rate is above a certain level. When the rate of change is detected, the TD injection end output device 14 outputs an operation command to the alarm device 15, the stopper drive control device 16, and the pinch roll drive control device 17 to automatically close the stopper nozzle 2. At the same time, the withdrawal of the slab 9 is temporarily stopped, then an operation command is output to the ladle nozzle drive control device 18, and the molten steel in the rear ladle 20 is started to be injected into the TD 1 by the ladle nozzle drive device 19 and the mold 8
A continuous casting method of different steel types in which the injection into the slab and the withdrawal of the slab 9 are restarted is shown. This method is a "continuous casting method of different types of steel mixed in the mold"
Is.
【0018】図3には、図2と同様にTD注入終了出力
装置14からの操作指令の出力に基ずいて、ストッパー
ノズルを閉止すると共に鋳片の引抜を一時中断した後、
鋳型8の内部にシーケンスブロック21を挿入した後、
後鍋溶鋼のTDへの注入を開始し、鋳型内への注入及び
鋳片9の引抜を再開する異鋼種連々鋳法を示す。この方
法は、「シーケンスブロック挿入型異鋼種連々鋳法」で
ある。Similar to FIG. 2, in FIG. 3, the stopper nozzle is closed based on the output of the operation command from the TD injection end output device 14, and the withdrawal of the cast piece is temporarily interrupted.
After inserting the sequence block 21 into the mold 8,
A continuous casting method of different steel types in which the injection of the molten steel into the TD is started, and the injection into the mold and the withdrawal of the slab 9 are restarted is shown. This method is "sequence block insertion type different steel type continuous casting method".
【0019】尚、図1、図2及び図3の方法において、
TD注入終了出力装置14から警報装置15へ出力され
た警報により、オペレーターが手動でストッパーノズル
の閉止、ピンチロールの停止、取鍋注入、TD注入及び
鋳片引抜などの一連の操作を手動で行うことも可能であ
る。In the method shown in FIGS. 1, 2 and 3,
An operator manually performs a series of operations such as closing the stopper nozzle, stopping the pinch roll, ladle pouring, TD pouring, and slab withdrawal by an alarm output from the TD pouring end output device 14 to the alarm device 15. It is also possible.
【0020】[0020]
【作用】図4に、発明者らが測定したTD注入終了時の
鋳型内湯面レベル変化の例(渦流式レベル計)を示す。FIG. 4 shows an example of the change in the molten metal level in the mold (vortex flow level meter) measured by the inventors at the end of TD injection.
【0021】図において、TD内溶鋼の注入が終了する
と、鋳型内湯面レベル計の指示値が急激に低下すること
が明らかである。この現象は溶融、パウダーとスラグの
物性差によって発生するものと考えられる。In the figure, it is clear that when the injection of the molten steel in the TD is completed, the value indicated by the molten metal level gauge in the mold drops sharply. This phenomenon is considered to occur due to the difference in the physical properties between the melt and the powder and the slag.
【0022】本発明になる鋳造終了法及び異鋼種連々鋳
法においては、いずれも従来の方法に比べてTD内溶鋼
を残らず鋳型へ完鋳出来ると同時に、鋳型内に流出する
TDスラグを殆ど皆無にコントロールすることが出来、
しかも再現性が高い。In both the casting termination method and the different steel type continuous casting method according to the present invention, compared with the conventional method, the molten steel in the TD can be completely cast into the mold without leaving at the same time, and at the same time, the TD slag flowing out into the mold is almost eliminated. You can control without any
Moreover, the reproducibility is high.
【0023】[0023]
【実施例】ヒートサイズ270トン/チャージの転炉に
て機械構造用鋼を溶製し、曲率半径12mRの湾曲型連
鋳機で横断面サイズ350mm×560mmの鋳片を鋳
造した。鋳型内湯面レベル計としては渦流式レベル計を
用い、本発明の方法、装置により鋳造を行った。EXAMPLE Steel for machine structural use was melted in a converter with a heat size of 270 tons / charge, and a slab having a cross-sectional size of 350 mm × 560 mm was cast by a curved continuous casting machine having a radius of curvature of 12 mR. A vortex flow level meter was used as the level gauge in the mold, and casting was performed by the method and apparatus of the present invention.
【0024】先鍋としてS45C、後鍋としてSCM4
20を容量30トンのTDを用いて異鋼種連々鋳した
が、先鍋のS45Cは鋳造速度0.70m/minで鋳
造し、取鍋注入終了後に後鍋として低合金鋼(SCM4
20)をレードルターレツトに載せて鍋交換を実施し
た。S45C as the first pot, SCM4 as the second pot
20 was continuously cast with different steel grades using a TD with a capacity of 30 tons, but S45C of the first ladle was cast at a casting speed of 0.70 m / min, and after pouring the ladle, it was made of low alloy steel (SCM4).
20) was placed on the ladle turret and the pan was replaced.
【0025】図2に示した「鋳型内湯混ざり型異鋼種連
々鋳法(A法)」及び図3に示した「シーケンスブロッ
ク挿入型異鋼種連々鋳法(B法)」を夫々実施すると共
に、比較のためにTD内に先鍋の溶鋼を3トン残して後
鍋を注入混合する「TD内湯混ざり型異鋼種連々鋳法」
も行った。While carrying out the "Mixed-in-mold type different steel type continuous casting method (A method)" shown in FIG. 2 and the "Sequence block insertion type different steel type continuous casting method (B method)" shown in FIG. 3, respectively, For comparison, "TD inner molten metal mixed type continuous steel casting method" in which 3 tons of molten steel in the first ladle is left in the TD and the latter ladle is poured and mixed
I also went.
【0026】異鋼種連々鋳継目部の鋳片の長さを比較し
て図5に示す。本発明になる方法では、鋳片継目部の長
さは明らかに短く鋳造歩留が高い結果が得られた。FIG. 5 shows a comparison of the lengths of the slabs at the seam joints of different steel types. According to the method of the present invention, the length of the seam of the cast slab is apparently short and the casting yield is high.
【0027】[0027]
【発明の効果】本発明では、TD内残湯量を殆ど皆無と
することが出来るので、異鋼種連々鋳における継目片長
さの低減、鋳造歩留の向上に大きな効果があると共に、
TD内スラグの鋳型内への流出を確実に防止出来るの
で、操業の安定化にも極めて大きな効果がある。According to the present invention, since the amount of residual hot water in the TD can be made almost zero, there is a great effect in reducing the seam piece length in continuous casting of different steel types and improving the casting yield.
Since it is possible to reliably prevent the outflow of the slag in the TD into the mold, it is extremely effective in stabilizing the operation.
【図1】本発明の鋳造終了装置を示す説明図。FIG. 1 is an explanatory view showing a casting termination device of the present invention.
【図2】本発明による異鋼種連々鋳法を示す説明図。FIG. 2 is an explanatory view showing a continuous casting method for different steel types according to the present invention.
【図3】本発明による異鋼種連々鋳法を示す説明図。FIG. 3 is an explanatory view showing a continuous casting method for different steel types according to the present invention.
【図4】TD注入終了時の湯面レベル変化を示す図。FIG. 4 is a diagram showing changes in the molten metal level at the end of TD injection.
【図5】本発明の効果を示す図。FIG. 5 is a diagram showing the effect of the present invention.
1 TD 2 ストッパーノズル 3 ストッパー支持アーム 4 ストッパー駆動装置 5 溶鋼 6 TDスラグ 7 浸漬ノズル 8 鋳型 9 鋳片 10 ピンチロール 11 鋳型内湯面レベル計 12 鋳型内湯面レベル演算及び湯面レベル急速低下検
知装置 13 取鍋注入終了入力装置 14 TD注入終了出力装置 15 警報装置 16 ストッパー駆動制御装置 17 ピンチロール駆動制御装置 18 取鍋ノズル駆動制御装置 19 取鍋ノズル駆動装置 20 後鍋 21 シーケンスブロック1 TD 2 Stopper nozzle 3 Stopper support arm 4 Stopper drive device 5 Molten steel 6 TD slag 7 Immersion nozzle 8 Mold 9 Cast slab 10 Pinch roll 11 Mold level gauge 12 Mold level calculation and melt level rapid drop detector 13 Ladle injection end input device 14 TD injection end output device 15 Alarm device 16 Stopper drive control device 17 Pinch roll drive control device 18 Ladle nozzle drive control device 19 Ladle nozzle drive device 20 Rear pan 21 Sequence block
Claims (2)
ィッシュへの溶鋼注入が終了した以降、鋳型内湯面レベ
ルを監視して該湯面レベルが急激にに低下した瞬間をタ
ンディッシュ内溶鋼の鋳型への注入が終了したと判定し
タンディッシュ注入ノズルを閉止することを特徴とする
タンディッシュ内溶鋼注入終了方法。1. In the continuous casting of steel, after the molten steel injection from the ladle to the tundish is completed, the level of the molten metal in the mold is monitored and the moment when the molten metal level drops sharply A method for terminating molten steel injection in a tundish, which comprises closing the tundish injection nozzle upon determining that the injection into the mold is completed.
ンディッシュへの溶鋼注入が終了したことを入力する手
段と、鋳型内湯面レベル検出手段と、該鋳型内湯面レベ
ル検出手段で検出した湯面レベルが急激に低下したこと
を検知する手段と、タンディッシュ注入ノズルを閉止す
る制御手段とから構成され、取鍋からタンディッシュへ
の溶鋼注入終了信号が入力された後、鋳型内湯面レベル
の急速低下を検知した時点でタンディッシュ注入ノズル
を閉止せしめる制御を行う機能を具備したことを特徴と
するタンディッシュ内溶鋼注入終了装置。2. In a continuous casting facility for steel, means for inputting completion of molten steel injection from a ladle to a tundish, means for detecting a molten metal level in a mold, and molten metal detected by the means for detecting a molten metal level in the mold It consists of a means to detect that the surface level has dropped sharply and a control means to close the tundish injection nozzle.After the molten steel injection end signal from the ladle to the tundish is input, An apparatus for terminating molten steel injection in a tundish having a function of controlling to close a tundish injection nozzle when a rapid drop is detected.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10489893A JPH06292951A (en) | 1993-04-08 | 1993-04-08 | Method for completing pouring of molten steel in tundish and device therefor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10489893A JPH06292951A (en) | 1993-04-08 | 1993-04-08 | Method for completing pouring of molten steel in tundish and device therefor |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH06292951A true JPH06292951A (en) | 1994-10-21 |
Family
ID=14392970
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10489893A Withdrawn JPH06292951A (en) | 1993-04-08 | 1993-04-08 | Method for completing pouring of molten steel in tundish and device therefor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH06292951A (en) |
-
1993
- 1993-04-08 JP JP10489893A patent/JPH06292951A/en not_active Withdrawn
Similar Documents
Publication | Publication Date | Title |
---|---|---|
KR20090064452A (en) | Method for pouring melt from a tiltable metallurgic vessel and system for performing the method | |
US4370719A (en) | Control of centrifugal pipe casting operation | |
CA2793913A1 (en) | Device and method for closing an outflow opening of a metallurgical vessel | |
JPH06292951A (en) | Method for completing pouring of molten steel in tundish and device therefor | |
JP3604661B2 (en) | Method and device for judging completion of molten steel injection | |
JPH09253815A (en) | Device for adjusting molten metal quantity in ladle in continuous caster | |
JPH08168871A (en) | Apparatus for pouring molten metal | |
JP3130170B2 (en) | Injection nozzle abnormality judgment method | |
JPH09150241A (en) | Method for completing casting of molten steel in tundish | |
JPS619966A (en) | Estimating method of amount of molten steel remaining in ladle | |
JPH02200362A (en) | Method for predicting and restraining nozzle clogging in continuous casting apparatus | |
JP3107688B2 (en) | Pinch roller speed controller for continuous casting equipment | |
JPH0361536B2 (en) | ||
JPH0947861A (en) | Method for pouring molten metal in ladle | |
JPH06344125A (en) | Automatic molten metal pouring apparatus | |
JPH0617110A (en) | Method for deciding completion of metal tapping | |
SU1431893A1 (en) | Method and apparatus for determining the mass of slag in melt | |
JPS61222665A (en) | Detection of slag outflow | |
JPH0571340B2 (en) | ||
JP4457707B2 (en) | Finishing pouring of molten steel in tundish | |
JPS61226155A (en) | Detection of slag outflow | |
JPH0745096B2 (en) | Continuous casting method | |
JPH01170569A (en) | Method for controlling automatic casting in continuous casting | |
JPH09150251A (en) | Method for completing pouring of molten steel in ladle | |
JPS583764A (en) | Charging method for molten metal |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20000704 |