JPH0631413A - Method for controlling inert gas blowing rate into immersion nozzle in continuous casting - Google Patents

Method for controlling inert gas blowing rate into immersion nozzle in continuous casting

Info

Publication number
JPH0631413A
JPH0631413A JP19393792A JP19393792A JPH0631413A JP H0631413 A JPH0631413 A JP H0631413A JP 19393792 A JP19393792 A JP 19393792A JP 19393792 A JP19393792 A JP 19393792A JP H0631413 A JPH0631413 A JP H0631413A
Authority
JP
Japan
Prior art keywords
inert gas
immersion nozzle
flow rate
mold
nozzle
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.)
Pending
Application number
JP19393792A
Other languages
Japanese (ja)
Inventor
Shuji Tanaka
修二 田中
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Original Assignee
Kawasaki Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Priority to JP19393792A priority Critical patent/JPH0631413A/en
Publication of JPH0631413A publication Critical patent/JPH0631413A/en
Pending legal-status Critical Current

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  • Continuous Casting (AREA)
  • Flow Control (AREA)

Abstract

PURPOSE:To provide a control method of inert gas blowing rate into an immersion nozzle for suppressing the variation of molten metal surface level in a mold to the irreducible minimum, in continuous casting. CONSTITUTION:In the control method of the inert gas blowing rate into the immersion nozzle 4 in the continuous casting, by changing the opening of a sliding nozzle 3 fitted between a tundish 1 and the immersion nozzle 4, a feedforward control is applied on an operating signal in the inert gas flow rate adjusting valve 12. Then, by adjusting the inert gas blowing rate into the immersion nozzle, the variation of the molten metal surface level in the mold can be suppressed to the irreducible minimum.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、連続鋳造における浸漬
ノズルへの不活性ガス吹き込み流量の制御方法に関す
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the flow rate of an inert gas blown into a dipping nozzle in continuous casting.

【0002】[0002]

【従来の技術】従来、溶融金属の連続鋳造においては、
タンディッシュからモールドへの連続鋳造に用いられる
浸漬ノズル内に生じるAl2O3 析出による目詰まり防止の
ために、浸漬ノズルやスライディングノズルに不活性ガ
スを吹き込んでいる。一般に、モールド内の湯面レベル
の制御は、モールド湯面レベル計からの出力信号により
スライディングノズルの開度を制御して、モールドへの
溶融金属注入量を調節してモールド内湯面レベルを一定
に保つようにフィードバック制御が行われている。浸漬
ノズルへの不活性ガス吹き込み量は、浸漬ノズルの内圧
と不活性ガス吹き込み配管内のガス圧力の差圧によって
決定される。スライディングノズルの開度により、浸漬
ノズルへの溶融金属の注入流量が変化するため、浸漬ノ
ズルの内圧は、上記スライディングノズルの開度と密接
な関係がある。
2. Description of the Related Art Conventionally, in continuous casting of molten metal,
An inert gas is blown into the immersion nozzle or sliding nozzle to prevent clogging due to Al 2 O 3 precipitation that occurs in the immersion nozzle used for continuous casting from the tundish to the mold. Generally, the level of molten metal in the mold is controlled by controlling the opening of the sliding nozzle by the output signal from the mold level meter and adjusting the amount of molten metal injected into the mold to keep the level of molten metal in the mold constant. Feedback control is performed to keep it. The amount of inert gas blown into the immersion nozzle is determined by the pressure difference between the internal pressure of the immersion nozzle and the gas pressure in the inert gas injection pipe. Since the flow rate of the molten metal injected into the immersion nozzle changes depending on the opening of the sliding nozzle, the internal pressure of the immersion nozzle is closely related to the opening of the sliding nozzle.

【0003】即ち、湯面レベルの低下信号によってスラ
イディングノズルの開度が大きくなると注入流量が増加
し、浸漬ノズル内圧が低下するため、Arガス流量は一時
的に増加する方向になり、逆に湯面レベル上昇信号によ
ってスライディングノズル開度が小さくなると注入流量
が低下し、浸漬ノズル内圧が上昇するためArガス流入量
は一時的に減少する方向になる。
That is, when the opening level of the sliding nozzle is increased by the signal for lowering the molten metal surface level, the injection flow rate is increased, and the internal pressure of the immersion nozzle is reduced. When the sliding nozzle opening degree is decreased by the surface level increase signal, the injection flow rate is decreased and the immersion nozzle internal pressure is increased, so that the Ar gas inflow amount tends to be temporarily decreased.

【0004】この不活性ガスの吹き込み量が多いと、モ
ールド内の溶融金属表面上に、不活性ガスが多量に浮上
してモールド内湯面レベル制御に悪影響を与え、モール
ド内湯面レベル変動が大きくなる。特開昭60−133959号
公報には、この状態を解決するために、タンディッシュ
から溶融金属を、不活性ガスの供給も兼ねる浸漬ノズル
を介して連続鋳造用鋳型へ注入し鋳造する方法におい
て、浸漬ノズルへ吹き込む不活性ガス供給量を連続鋳造
用鋳型内の湯面の変動速度に応じて、調整しつつ吹き込
むことを特徴とする溶融金属の鋳造方法が開示されてい
る。
When the amount of the inert gas blown in is large, a large amount of the inert gas floats on the surface of the molten metal in the mold, which adversely affects the level control of the molten metal inside the mold, resulting in large fluctuations in the molten metal level inside the mold. . JP-A-60-133959 discloses, in order to solve this state, molten metal from the tundish, in a method of casting by casting into a continuous casting mold through an immersion nozzle that also serves as the supply of an inert gas, Disclosed is a method for casting molten metal, characterized in that the amount of the inert gas supplied to the immersion nozzle is adjusted and blown according to the changing speed of the molten metal level in the continuous casting mold.

【0005】[0005]

【発明が解決しようとする課題】しかしながら、スライ
ディングノズルによる湯面レベル制御を行いつつモール
ドレベルの変動速度に応じて不活性ガスの供給流量を調
整する前記の従来方法では、浸漬ノズル内の内圧の変化
と、不活性ガス流量調節弁から配管を通して不活性ガス
吹き込み口まで不活性ガスが移動する場合の遅れなどに
より、スライディングノズル開度制御と不活性ガス流量
制御とが同調せずお互いに干渉し合い、モールドレベル
の一時的な大きな変動は避けられない。
However, in the above-mentioned conventional method of adjusting the supply flow rate of the inert gas in accordance with the fluctuation speed of the mold level while controlling the molten metal level by the sliding nozzle, the internal pressure of the immersion nozzle is Due to changes and delays when the inert gas moves from the inert gas flow control valve to the inert gas inlet through the pipe, the sliding nozzle opening control and the inert gas flow control do not synchronize and interfere with each other. Therefore, a temporary large fluctuation of the mold level is unavoidable.

【0006】本発明は、上記の従来技術の問題を解決
し、モールド内湯面レベルの変化をより小さく抑えるこ
とが可能な連続鋳造における浸漬ノズルへの不活性ガス
吹き込み流量の制御方法を提供するものである。
The present invention solves the above-mentioned problems of the prior art and provides a method of controlling the flow rate of the inert gas blown into the immersion nozzle in continuous casting, which can suppress the change of the molten metal surface level in the mold. Is.

【0007】[0007]

【課題を解決するための手段】本発明は、連続鋳造にお
ける浸漬ノズルへの不活性ガス吹き込み流量の制御方法
において、タンディッシュと該浸漬ノズルとの間に装着
されたスライディングノズルの開度の変化により、不活
性ガス流量調節弁の操作信号にフィード・フォワード制
御を行い、該浸漬ノズルへの不活性ガス吹き込み流量を
調節することを特徴とする連続鋳造における浸漬ノズル
への不活性ガス吹き込み流量の制御方法である。
DISCLOSURE OF THE INVENTION The present invention relates to a method for controlling the flow rate of an inert gas blown into a submerged nozzle in continuous casting, in which the opening of a sliding nozzle mounted between the tundish and the submerged nozzle is changed. The feed-forward control is performed on the operation signal of the inert gas flow rate control valve, and the flow rate of the inert gas blown into the immersion nozzle is adjusted to control the flow rate of the inert gas blown into the immersion nozzle. It is a control method.

【0008】[0008]

【作 用】本発明によれば、スライディングノズルが開
いた場合、浸漬ノズル内の溶鋼流量が増加し、浸漬ノズ
ル内圧が低下するため一時的に不活性ガス吹き込み流量
が増えようとするのを、スライディングノズル開度の変
化に応じてp動作制御して不活性ガス流量をその流量調
節弁により一定量調節し、不活性ガス吹き込み流量が適
量増加するように調整されるので、モールド湯面レベル
制御に与える影響は少なくなる。
[Operation] According to the present invention, when the sliding nozzle is opened, the molten steel flow rate in the immersion nozzle increases and the internal pressure of the immersion nozzle decreases, so that the flow rate of the inert gas blown is temporarily increased. The p operation is controlled according to the change in the sliding nozzle opening, the flow rate of the inert gas is adjusted by the flow control valve to a certain amount, and the flow rate of the inert gas is adjusted so as to increase appropriately. Has less effect on.

【0009】逆にスライディングノズルが閉まった場合
は、不活性ガス吹き込み流量が僅かしか減少しないた
め、浸漬ノズル閉塞防止の効果は充分に保てる。
On the contrary, when the sliding nozzle is closed, the flow rate of the inert gas is slightly reduced, so that the effect of blocking the immersion nozzle can be sufficiently maintained.

【0010】[0010]

【実施例】図1は、本発明に用いる装置の系統説明図で
ある。タンディッシュ1内の溶鋼はスライディングノズ
ル3を通り、浸漬ノズル4を経てモールド2に注入され
る。5はスライディングノズル操作用油圧シリンダであ
り、6はモールド内湯面レベル検出器、7はモールド内
湯面レベル検出器からの出力信号の増幅器、8はモール
ド内湯面レベル調節計、9は油圧バルブスタンド、11は
不活性ガス流量計、13は不活性ガス遮断弁、15は不活性
ガス流量フィード・フォワード調節計、16は不活性ガス
吹き込み配管である。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a system diagram of an apparatus used in the present invention. Molten steel in the tundish 1 passes through a sliding nozzle 3 and a dipping nozzle 4 and is poured into a mold 2. 5 is a hydraulic cylinder for operating the sliding nozzle, 6 is a level controller in the mold, 7 is an amplifier of the output signal from the level detector in the mold, 8 is a level controller in the mold, 9 is a hydraulic valve stand, Reference numeral 11 is an inert gas flow meter, 13 is an inert gas cutoff valve, 15 is an inert gas flow rate feed forward controller, and 16 is an inert gas blowing pipe.

【0011】溶鋼がスライディングノズル3を通過する
際、スライディングノズル開度計10の出力信号により、
不活性ガス流量フィード・フォワード調節計15は、スラ
イディングノズル3が開いた時は、一時的に不活性ガス
流量調節弁12が所定量閉じるようにし、逆にスライディ
ングノズル3が閉じた時は、不活性ガス流量調節弁12が
一時的に所定量開くように、不活性ガス流量調節計14に
フィード・フォワード指令信号を出力する。
When molten steel passes through the sliding nozzle 3, an output signal from the sliding nozzle opening gauge 10 causes
The inert gas flow rate feed forward controller 15 causes the inert gas flow rate control valve 12 to be temporarily closed by a predetermined amount when the sliding nozzle 3 is opened, and conversely when the sliding nozzle 3 is closed, A feed forward command signal is output to the inert gas flow rate controller 14 so that the active gas flow rate control valve 12 is temporarily opened by a predetermined amount.

【0012】図2は、本発明方法の1実施例および従来
例におけるモールド内湯面レベル、スライディングノズ
ル開度、不活性ガス流量調節弁開度および不活性ガス吹
き込み流量の時間挙動関係特性図である。モールドレベ
ル制御精度を向上するため、オブザーバ制御を適用した
従来方法では、スライディングノズル開度を急激に変化
させるため、この不活性ガス吹き込み量の変化への影響
が著しく、その結果モールド内湯面レベルの大きな変動
が見られるが、本発明方法を適用すると不活性ガス吹き
込み流量およびモールド内湯面レベルは安定している。
FIG. 2 is a characteristic diagram of the time-behavior relationship of the molten metal level in the mold, the sliding nozzle opening, the inert gas flow control valve opening, and the inert gas blowing flow in one embodiment of the method of the present invention and the conventional example. . In order to improve the mold level control accuracy, the conventional method using observer control changes the sliding nozzle opening abruptly, which has a significant effect on the change in the amount of inert gas blown, and as a result Although a large fluctuation is observed, when the method of the present invention is applied, the flow rate of the inert gas blown in and the level of the molten metal in the mold are stable.

【0013】[0013]

【発明の効果】本発明では、スライディングノズル開度
の変化に応じて不活性ガス流量の制御にフィード・フォ
ワード制御を適用したので、スライディングノズル開度
の変化による不活性ガス流量の変動が軽減され、モール
ド内湯面レベルの大きな変動が避けられた。
In the present invention, the feed forward control is applied to the control of the inert gas flow rate according to the change of the sliding nozzle opening, so that the fluctuation of the inert gas flow rate due to the change of the sliding nozzle opening is reduced. A large fluctuation in the level of the molten metal inside the mold was avoided.

【0014】[0014]

【図面の簡単な説明】[Brief description of drawings]

【0015】[0015]

【図1】本発明の方法の実施に用いる1装置の系統説明
図である。
FIG. 1 is a system diagram of one device used for carrying out the method of the present invention.

【0016】[0016]

【図2】本発明の方法の1実施例と従来例のモールド内
湯面レベル、スライディングノズル開度、不活性ガス流
量調節弁開度および不活性ガス吹き込み流量を示す説明
図である。
FIG. 2 is an explanatory diagram showing a molten metal level in a mold, a sliding nozzle opening, an inert gas flow rate control valve opening, and an inert gas blowing flow rate in one embodiment of the method of the present invention and a conventional example.

【0017】[0017]

【符号の説明】[Explanation of symbols]

1 タンディッシュ 2 モールド 3 スライディングノズル 4 浸漬ノズル 5 油圧シリンダ 6 モールド内湯面レベル検出器 7 モールド内湯面レベル検出器からの出力信号の増幅
器 8 モールド内湯面レベル調節計 9 油圧バルブスタンド 10 スライディングノズル開度計 11 不活性ガス流量計 12 不活性ガス流量調節弁 13 不活性ガス遮断弁 14 不活性ガス流量調節計 15 不活性ガス流量フィード・フォワード調節計 16 不活性ガス吹き込み配管
1 Tundish 2 Mold 3 Sliding Nozzle 4 Immersion Nozzle 5 Hydraulic Cylinder 6 Mold Level Controller in Mold 7 Amplifier of Output Signal from Mold Level Detector in Mold 8 Level Controller in Mold 9 Hydraulic Valve Stand 10 Sliding Nozzle Opening Meter 11 Inert gas flow meter 12 Inert gas flow control valve 13 Inert gas shutoff valve 14 Inert gas flow controller 15 Inert gas flow feed forward controller 16 Inert gas blowing pipe

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 連続鋳造における浸漬ノズルへの不活性
ガス吹き込み流量制御方法において、タンディッシュと
該浸漬ノズルとの間に装着されたスライディングノズル
の開度の変化により、不活性ガス流量調節弁の操作信号
にフィード・フォワード制御を行い、該浸漬ノズルへの
不活性ガス吹き込み流量を調節することを特徴とする連
続鋳造における浸漬ノズルへの不活性ガス吹き込み流量
の制御方法。
1. A method for controlling a flow rate of an inert gas blown into a submerged nozzle in continuous casting, wherein an inert gas flow rate control valve of an inert gas flow control valve is changed by changing an opening of a sliding nozzle mounted between the tundish and the submerged nozzle. A method for controlling the flow rate of an inert gas blown into a dipping nozzle in continuous casting, wherein feedforward control is performed on an operation signal to adjust the flow rate of an inert gas blown into the dipping nozzle.
JP19393792A 1992-07-21 1992-07-21 Method for controlling inert gas blowing rate into immersion nozzle in continuous casting Pending JPH0631413A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19393792A JPH0631413A (en) 1992-07-21 1992-07-21 Method for controlling inert gas blowing rate into immersion nozzle in continuous casting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19393792A JPH0631413A (en) 1992-07-21 1992-07-21 Method for controlling inert gas blowing rate into immersion nozzle in continuous casting

Publications (1)

Publication Number Publication Date
JPH0631413A true JPH0631413A (en) 1994-02-08

Family

ID=16316229

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19393792A Pending JPH0631413A (en) 1992-07-21 1992-07-21 Method for controlling inert gas blowing rate into immersion nozzle in continuous casting

Country Status (1)

Country Link
JP (1) JPH0631413A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2639974A1 (en) * 1988-12-02 1990-06-08 Oceamer DEVICE FORMING ANTI-TURBULENCE SCREEN AND WIND PROTECTION

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2639974A1 (en) * 1988-12-02 1990-06-08 Oceamer DEVICE FORMING ANTI-TURBULENCE SCREEN AND WIND PROTECTION

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