JPH105945A - Method for controlling molten steel flow in continuous casting mold - Google Patents
Method for controlling molten steel flow in continuous casting moldInfo
- Publication number
- JPH105945A JPH105945A JP16652696A JP16652696A JPH105945A JP H105945 A JPH105945 A JP H105945A JP 16652696 A JP16652696 A JP 16652696A JP 16652696 A JP16652696 A JP 16652696A JP H105945 A JPH105945 A JP H105945A
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- Prior art keywords
- magnetic field
- mold
- flow
- molten steel
- frequency
- Prior art date
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Abstract
(57)【要約】
【課題】 移動磁場による連続鋳造鋳型内溶鋼の流動制
御方法において、電磁制動された吐出流と鋳型サイズと
に起因する共振現象による流動や、磁場強度と吐出流速
のバランスのくずれた場合の付随流れにより、脱酸生成
物及びモールドパウダーが鋳片に捕捉される。
【解決手段】 磁場の移動方向が鋳型幅方向であるリニ
ア移動磁場発生装置８、１０にて、磁束密度と移動磁場
の周波数とを鋳造中に独立に変更して磁場を印加する、
又は、鋳型幅方向左右２つに分割されたリニア移動磁場
発生装置に印加する交流電流の位相を鋳造中に相対的に
変化させる。
PROBLEM TO BE SOLVED: To provide a method for controlling the flow of molten steel in a continuous casting mold by a moving magnetic field, wherein the flow is caused by a resonance phenomenon caused by an electromagnetically damped discharge flow and a mold size, and a balance between a magnetic field intensity and a discharge flow velocity. The deoxidation products and mold powder are trapped in the slab by the accompanying flow in the case of collapse. SOLUTION: In a linear moving magnetic field generator 8, 10 in which a moving direction of a magnetic field is a mold width direction, a magnetic field is applied by changing a magnetic flux density and a frequency of a moving magnetic field independently during casting.
Alternatively, the phase of the alternating current applied to the linear moving magnetic field generator divided into two right and left parts in the mold width direction is relatively changed during casting.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、鋳型に設置したリ
ニア移動磁場発生装置により鋼の連続鋳造鋳型内の溶鋼
流動を制御する方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the flow of molten steel in a continuous casting mold of steel by a linear moving magnetic field generator installed in the casting mold.
【０００２】[0002]
【従来の技術】鋼の連続鋳造法においては、タンディッ
シュから浸漬ノズルを介し、鋳型短辺に向け注入された
溶鋼の吐出流は、短辺凝固シェルに衝突して下降流と上
昇流とに分かれ、そして、下降流は鋳片未凝固層深部に
進入し、又、上昇流は鋳型内溶鋼表面（以下、「メニス
カス」と記す）で鋳型短辺から浸漬ノズルに向かう流れ
となり、メニスカスに「渦」、「盛り上がり」等の流れ
の乱れを生成させる。2. Description of the Related Art In a continuous casting method of steel, a discharge flow of molten steel injected from a tundish through an immersion nozzle toward a short side of a mold collides with a short-side solidified shell to form a downward flow and an upward flow. The downward flow enters the deep portion of the slab unsolidified layer, and the upward flow flows from the short side of the mold toward the immersion nozzle on the surface of the molten steel in the mold (hereinafter referred to as "meniscus"). A turbulence such as a vortex or a swell is generated.
【０００３】脱酸生成物であるアルミナを主体とする酸
化物は、下降流により鋳片未凝固層深くまで侵入して凝
固シェルに捕捉され、又、メニスカス上に添加されたモ
ールドパウダーは、メニスカスの渦や盛り上がりにより
溶鋼中に巻き込まれ、凝固シェルに補捉される。そし
て、これらに起因する非金属介在物が鋳片の品質欠陥の
主原因であり、この現象は鋳造速度の増速に伴う吐出流
速度の高速度化や、浸漬ノズル内又は浸漬ノズル吐出孔
にアルミナが付着して左右の吐出流速が不均一となる、
所謂、偏流が発生した場合に顕著となっている。[0003] The oxide mainly composed of alumina, which is a deoxidation product, penetrates deeply into the unsolidified layer of the slab by a downward flow and is captured by the solidified shell. The mold powder added on the meniscus is Is swept up into the molten steel by the whirlpools and swells, and is caught by the solidified shell. The non-metallic inclusions resulting from these are the main causes of quality defects of the slab, and this phenomenon increases the discharge flow speed due to the increase of the casting speed, and the inside of the immersion nozzle or the immersion nozzle discharge hole Alumina adheres and the left and right discharge flow rates become uneven,
This is remarkable when so-called drift occurs.
【０００４】この対策として、電磁力（Electro-magnet
ic force）を用いて溶鋼流動を制動しようとする試みが
数多く提案されている。As a countermeasure against this, an electromagnetic force (Electro-magnet
Numerous attempts to dampen the flow of molten steel using ic force) have been proposed.
【０００５】特開平３−１４２０４９号公報（以下、
「先行技術１」と記す）には、対向する鋳型長辺各背面
の上下に設置した上下各一対の磁極の間で、鋳片の幅全
体にわたり静磁場を印加させ、吐出流を磁場で減速させ
る方法が開示されている。[0005] Japanese Patent Application Laid-Open No. 3-14049 (hereinafter, referred to as "
According to “Prior art 1”, a static magnetic field is applied across the entire width of a slab between a pair of upper and lower magnetic poles installed above and below each back surface of a long side of a facing mold, and the discharge flow is decelerated by the magnetic field. There is disclosed a method for causing this to occur.
【０００６】特開平１−１５０４５０号公報（以下、
「先行技術２」と記す）には、メニスカスの下１．５ｍ
から４．０ｍの鋳造方向下方の範囲に、直流磁場もしく
は低周波交流磁場を印加させ、磁場を通過する溶鋼流動
を減速・分散させる技術が開示されている。[0006] Japanese Patent Application Laid-Open No. 1-150450 (hereinafter referred to as
1.5 m below the meniscus
A technique of applying a DC magnetic field or a low-frequency AC magnetic field to a range below 4.0 m in the casting direction to reduce and disperse the flow of molten steel passing through the magnetic field is disclosed.
【０００７】又、先行技術１、２は磁場が移動しない静
止型磁場であるに対し、特開平５−２３８０４号公報
（以下、「先行技術３」と記す）には、低周波の交流電
源による移動磁場を用いる技術が開示されている。先行
技術３では鋳型長辺背面にリニア移動磁場発生装置を配
置し、浸漬ノズルからの溶鋼の吐出流方向と反対方向に
磁場を移動させることで溶鋼を磁場の移動方向に移動さ
せ、溶鋼の吐出流速度を減速させる技術であり、その
際、吐出する溶鋼流の断片が移動磁場の周波数周期の１
周期以上の期間を磁場内に滞在するように、リニア移動
磁場発生装置に印加する電流の周波数の下限値を定めて
いる。The prior arts 1 and 2 are static magnetic fields in which the magnetic field does not move. On the other hand, JP-A-5-23804 (hereinafter referred to as "prior art 3") discloses a low-frequency AC power supply. A technique using a moving magnetic field is disclosed. In Prior Art 3, a linear moving magnetic field generator is arranged on the back side of the long side of the mold, and the magnetic field is moved in the direction opposite to the direction of flow of the molten steel from the immersion nozzle, thereby moving the molten steel in the moving direction of the magnetic field, thereby discharging the molten steel. This is a technique for reducing the flow velocity, in which a fragment of the molten steel flow to be discharged is one of the frequency periods of the moving magnetic field.
The lower limit of the frequency of the current applied to the linear moving magnetic field generator is determined so that the period longer than the period stays in the magnetic field.
【０００８】[0008]
【発明が解決しようとする課題】先行技術１は、鋳片の
全幅にわたって磁場を配置し、吐出流の局所に磁場を配
置した場合に発生する溶鋼流の局部的な回り込みを防止
している。しかし、先行技術１においても磁場が強過ぎ
る場合には、上下の磁場の谷間に沿って水平方向に溶鋼
流が走り、この溶鋼流は短辺凝固シェルに衝突した時点
で流れ方向を変え、下降流となる。更に、鋳片の端部で
ある短辺近傍では、鋳片と鋳型壁とが電気的に絶縁状態
にあるため、誘導電流が逆向きに流れて下降流を加速す
る方向に電磁力が作用するので、下降流は未凝固層深く
まで侵入する。その結果、鋳片の幅方向中央部の品質は
向上するものの、短辺近傍部は品質が劣化する。In the prior art 1, a magnetic field is arranged over the entire width of a slab to prevent a local sneak of a molten steel flow generated when the magnetic field is arranged locally in a discharge flow. However, even in the prior art 1, when the magnetic field is too strong, the molten steel flow runs in the horizontal direction along the valleys of the upper and lower magnetic fields, and the molten steel flow changes its flow direction when it collides with the short-side solidified shell, and descends. It becomes a flow. Furthermore, in the vicinity of the short side, which is the end of the slab, the slab and the mold wall are in an electrically insulated state, so that the induced current flows in the opposite direction and the electromagnetic force acts in a direction to accelerate the descending flow. Therefore, the downward flow penetrates deep into the unsolidified layer. As a result, the quality of the slab at the center in the width direction is improved, but the quality near the short side is deteriorated.
【０００９】先行技術２では、溶鋼への制動力の発生手
段として、直流磁場に代わって、低周波の交流磁場を用
いる方法も開示している。交流磁場の場合は、準静的な
誘導電流が存在しないため、先行技術１で発生する鋳片
短辺近傍での下降流を助長する現象はない。Prior Art 2 also discloses a method of using a low-frequency AC magnetic field instead of a DC magnetic field as a means for generating a braking force on molten steel. In the case of an AC magnetic field, since there is no quasi-static induced current, there is no phenomenon that promotes a downward flow near the short side of the slab, which occurs in the prior art 1.
【００１０】交流磁場の場合、印加する電流の周波数に
応じて磁界の方向と誘導電流の方向とは１８０度変化す
るものの、磁気による制動力の方向は変わらないため流
動制御が可能である。しかし、この制動力は、印加する
電流値に応じ、最大から零まで周期的に変化することに
なる。In the case of an AC magnetic field, the direction of the magnetic field and the direction of the induced current change by 180 degrees according to the frequency of the applied current, but the direction of the braking force by magnetism does not change, so that flow control is possible. However, this braking force changes periodically from the maximum to zero according to the applied current value.
【００１１】先行技術２では印加する電流の周波数が一
定で且つ１Ｈｚ未満の低周波であるので、磁気制動され
た溶鋼流は溶鋼流の慣性力のために印加される電流の周
波数で変動する。その結果、その変動がメニスカス部ま
で及ぶ高速鋳造の場合、電磁力の制御によって逆にメニ
スカスが乱れ、パウダーの巻き込みを助長する。In the prior art 2, since the frequency of the applied current is constant and a low frequency of less than 1 Hz, the magnetically damped molten steel flow fluctuates at the frequency of the applied current due to the inertia of the molten steel flow. As a result, in the case of high-speed casting in which the fluctuation extends to the meniscus portion, the meniscus is disturbed by the control of the electromagnetic force, and the entrainment of the powder is promoted.
【００１２】先行技術３は、磁場の移動方向への吐出流
の制動を目的としたもので、この場合、周波数が低く且
つ磁束密度が大きい条件の下で、吐出流の速度制動に主
眼をおいた制御を行うと、浸漬ノズルを中心としてメニ
スカスが大きく上下振動することがある。これは、電磁
力による吐出流の速度変動周期と鋳型サイズに起因する
湯面変動との共振現象により発生するものである。更
に、移動磁場の周波数を上げて磁場移動方向の制動力を
優先させると、移動磁場による付随流れが発生し、浸漬
ノズルからの吐出流速と磁場強度とのバランスがくずれ
た場合には、パウダー巻き込みを助長するような状況も
起こり得る。The prior art 3 aims at damping the discharge flow in the direction of movement of the magnetic field. In this case, the main focus is on the velocity damping of the discharge flow under conditions of low frequency and high magnetic flux density. When such control is performed, the meniscus may largely vibrate up and down around the immersion nozzle. This is caused by a resonance phenomenon between the cycle of the speed fluctuation of the discharge flow due to the electromagnetic force and the fluctuation of the molten metal level caused by the mold size. Furthermore, if the frequency of the moving magnetic field is increased and the braking force in the moving direction of the magnetic field is prioritized, an accompanying flow due to the moving magnetic field is generated, and if the balance between the discharge velocity from the immersion nozzle and the magnetic field strength is lost, powder entrainment occurs. There can be situations that promote the following.
【００１３】以上のように、電磁力を利用した鋳型内溶
鋼の流動制御方法に関して、いずれの方法も改善の余地
が大きいのが現状である。As described above, with respect to the flow control method of molten steel in a mold using electromagnetic force, at present, there is much room for improvement in any of the methods.
【００１４】本発明は、上記事情に鑑みなされたもの
で、その目的とするところは移動磁場における流動制御
方法を改善し、未凝固層深奥までの吐出流の侵入による
脱酸生成物の混入と、メニスカスにおける湯面変動に起
因するモールドパウダーの巻き込みとを共に防止して、
鋳片全幅にわたって非金属介在物のない高品質の鋳片を
製造するための連続鋳造鋳型内の溶鋼流動制御方法を提
供するものである。The present invention has been made in view of the above circumstances, and an object of the present invention is to improve a flow control method in a moving magnetic field so that mixing of a deoxidized product due to penetration of a discharge flow deep into an unsolidified layer can be prevented. , To prevent both entrainment of mold powder due to fluctuations in the level of the meniscus,
An object of the present invention is to provide a method for controlling the flow of molten steel in a continuous casting mold for producing a high quality slab without nonmetallic inclusions over the entire width of the slab.
【００１５】[0015]
【課題を解決するための手段】請求項１に係る本発明の
連続鋳造鋳型内の溶鋼流動制御方法は、磁場の移動方向
が鋳型幅方向であるリニア移動磁場発生装置にて磁場を
印加して鋳型内の溶鋼流動を制御する方法において、磁
束密度と移動磁場の周波数とを鋳造中に独立に変更する
ことを特徴とするものである。According to a first aspect of the present invention, there is provided a method for controlling molten steel flow in a continuous casting mold according to the present invention, wherein a magnetic field is applied by a linear moving magnetic field generator in which the moving direction of the magnetic field is the width direction of the mold. A method for controlling the flow of molten steel in a mold, wherein the magnetic flux density and the frequency of the moving magnetic field are independently changed during casting.
【００１６】交流移動磁場により溶鋼吐出流に作用する
制動力は、以下の２種類の制動力に区別することができ
る。The braking force acting on the molten steel discharge flow by the AC moving magnetic field can be classified into the following two types of braking force.
【００１７】１つは、磁場が移動することにより、溶鋼
中に誘導電流を発生させ、この誘導電流と磁場とによる
電磁力により、磁場の移動方向に溶鋼を強制的に流動さ
せ、この強制的な溶鋼流動と浸漬ノズルからの吐出流と
を干渉させて、吐出流速度を減速又は加速させるもの
で、以下この制動力を本願では「駆動力」と呼ぶ。One is that, when the magnetic field moves, an induced current is generated in the molten steel, and the electromagnetic force generated by the induced current and the magnetic field forces the molten steel to flow in the moving direction of the magnetic field. The flow of the molten steel and the discharge flow from the immersion nozzle interfere with each other to reduce or accelerate the discharge flow speed. Hereinafter, this braking force is referred to as “driving force” in the present application.
【００１８】他の１つは、電磁ブレーキとも呼ばれるも
ので、磁場中を吐出流が流動することで、吐出流に誘導
電流が発生し、この誘導電流と磁場とで生じる電磁力に
より、吐出流速度を減速させるもので、以下この制動力
を本願では「ブレーキ力」と呼ぶ。交流磁場によるブレ
ーキ力は、電流値に比例して周期的に変動する。The other one is also called an electromagnetic brake. When a discharge flow flows in a magnetic field, an induced current is generated in the discharge flow, and the discharge force is generated by the electromagnetic force generated by the induced current and the magnetic field. This braking force is referred to as "braking force" in the present application. The braking force due to the AC magnetic field fluctuates periodically in proportion to the current value.
【００１９】移動磁場の磁束密度をＢ、移動磁場の周波
数をｆ、浸漬ノズル吐出孔からの溶鋼吐出流の流速をＶ
とすると、駆動力はＢ2 ｆに比例して磁場の移動方向に
作用し、又、ブレーキ力はＢ2 Ｖに比例する。The magnetic flux density of the moving magnetic field is B, the frequency of the moving magnetic field is f, and the flow velocity of the molten steel discharge flow from the immersion nozzle discharge hole is V
Then, the driving force acts on the moving direction of the magnetic field in proportion to B 2 f, and the braking force is proportional to B 2 V.
【００２０】そのため、磁束密度Ｂと移動磁場の周波数
ｆを鋳造中に独立に変更することにより、吐出流に対し
て様々の磁気制動制御を行うことができ、又、磁束密度
を変更せずに周波数のみ変更することで、駆動力を増減
しつつブレーキ力を保持することができるので、浸漬ノ
ズルからの吐出流速に応じた制動力で制御することが可
能となり、移動磁場による付随流れを抑えることができ
る。Therefore, by changing the magnetic flux density B and the frequency f of the moving magnetic field independently during casting, various magnetic braking controls can be performed on the discharge flow, and without changing the magnetic flux density. By changing only the frequency, it is possible to maintain the braking force while increasing or decreasing the driving force, so it is possible to control with the braking force according to the discharge flow rate from the immersion nozzle, and to suppress the accompanying flow due to the moving magnetic field Can be.
【００２１】請求項２に係る本発明の連続鋳造鋳型内の
溶鋼流動制御方法は、磁場の移動方向が鋳型幅方向であ
るリニア移動磁場発生装置にて磁場を印加して鋳型内の
溶鋼流動を制御する方法において、磁場の磁束密度の２
乗と移動磁場の周波数との積が一定の条件で、磁束密度
と移動磁場の周波数とを鋳造中に連続的に変更すること
を特徴とするものである。According to a second aspect of the present invention, there is provided a method for controlling the flow of molten steel in a continuous casting mold according to the present invention. In the controlling method, the magnetic flux density of the magnetic field is 2
The method is characterized in that the magnetic flux density and the frequency of the moving magnetic field are continuously changed during casting under the condition that the product of the power and the frequency of the moving magnetic field is constant.
【００２２】リニア移動磁場発生装置に印加する電流の
周波数を鋳造中に連続的に変更するので、電磁力による
吐出流の速度変動周期と鋳型サイズに起因する湯面変動
との共振現象が完成する以前に周波数が変化するため、
共振現象の防止が可能となり、浸漬ノズルを中心とした
メニスカスの上下振動現象を防止できる。又、磁場の磁
束密度の２乗と移動磁場の周波数との積が一定の条件で
変更するので、駆動力を減じることがない。Since the frequency of the current applied to the linear moving magnetic field generator is continuously changed during casting, the resonance phenomenon of the fluctuation speed of the discharge flow due to the electromagnetic force and the fluctuation of the molten metal level caused by the mold size is completed. Because the frequency has changed before,
The resonance phenomenon can be prevented, and the vertical vibration phenomenon of the meniscus around the immersion nozzle can be prevented. Further, since the product of the square of the magnetic flux density of the magnetic field and the frequency of the moving magnetic field changes under a constant condition, the driving force is not reduced.
【００２３】請求項３に係る本発明の連続鋳造鋳型内の
溶鋼流動制御方法は、浸漬ノズルを中心として鋳型幅方
向左右に２分割され、磁場の移動方向が鋳型幅方向であ
るリニア移動磁場発生装置にて左右独立に磁場を印加し
て鋳型内の溶鋼流動を制御する方法において、２分割さ
れた左右のリニア移動磁場発生装置に印加する交流電流
の位相を鋳造中に相対的に変化させることを特徴とする
ものである。According to a third aspect of the present invention, there is provided a method for controlling the flow of molten steel in a continuous casting mold according to the present invention. In the method of controlling the flow of molten steel in the mold by applying a magnetic field independently on the left and right by the device, the phase of the alternating current applied to the two divided left and right linear moving magnetic field generators is relatively changed during casting It is characterized by the following.
【００２４】鋳型幅方向左右に２分割されているリニア
移動磁場発生装置に供給する交流電流の位相を相対的に
変化させることにより、電磁力による吐出流の速度変動
周期と鋳型サイズに起因する湯面変動との共振現象に外
乱を加えることができるので、共振の発生がなく、浸漬
ノズルを中心としたメニスカスの上下振動現象を防止で
きる。By relatively changing the phase of the alternating current supplied to the linear moving magnetic field generator divided into two parts left and right in the mold width direction, the speed fluctuation cycle of the discharge flow due to the electromagnetic force and the hot water caused by the mold size Since disturbance can be added to the resonance phenomenon with the surface fluctuation, no resonance occurs, and the vertical vibration phenomenon of the meniscus centering on the immersion nozzle can be prevented.
【００２５】請求項４に係る本発明の連続鋳造鋳型内の
溶鋼流動制御方法は、浸漬ノズルを中心として鋳型幅方
向左右に２分割され、磁場の移動方向が鋳型幅方向であ
るリニア移動磁場発生装置にて左右独立に磁場を印加し
て鋳型内の溶鋼流動を制御する方法において、２分割さ
れた左右のリニア移動磁場発生装置に印加する交流電流
の位相を鋳造中に相対的に変化させると共に、磁束密度
と移動磁場の周波数とを鋳造中に独立に変更することを
特徴とするものである。According to a fourth aspect of the present invention, there is provided a method for controlling the flow of molten steel in a continuous casting mold according to the present invention. In the method of controlling the flow of molten steel in the mold by applying a magnetic field independently on the left and right by the device, the phase of the alternating current applied to the two divided left and right linear moving magnetic field generators is relatively changed during casting and The magnetic flux density and the frequency of the moving magnetic field are independently changed during casting.
【００２６】印加する交流電流の位相を鋳造中に相対的
に変化させると共に、磁束密度と移動磁場の周波数とを
鋳造中に独立に変更するので、共振現象による浸漬ノズ
ルを中心としたメニスカスの上下振動現象を防止しつ
つ、吐出流に対して様々の制動制御を左右独立に行うこ
とができる。The phase of the alternating current to be applied is relatively changed during casting, and the magnetic flux density and the frequency of the moving magnetic field are independently changed during casting. Various braking controls on the discharge flow can be performed independently for the left and right while preventing the vibration phenomenon.
【００２７】[0027]
【発明の実施の形態】本発明の実施の形態を図１を参照
して説明する。図１は、本発明に係る鋳型内溶鋼の流動
制御方法を適用した連続鋳造機の鋳型部の概要を示す図
であり、（ａ）は側断面図、（ｂ）は平面図である。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. FIGS. 1A and 1B are diagrams showing an outline of a mold part of a continuous casting machine to which a flow control method of molten steel in a mold according to the present invention is applied, wherein FIG. 1A is a side sectional view and FIG.
【００２８】各１対の鋳型長辺２と鋳型短辺３とを組み
合わせた矩形型鋳型１の上部にタンディッシュ４が設け
られ、タンディッシュ４は図示しない取鍋から溶鋼５の
供給を受ける。溶鋼流量調整用のスライディングノズル
１４がタンディッシュ４の底部に設けられ、スライディ
ングノズル１４の下面に浸漬ノズル６が取り付けられて
いる。タンディッシュ４内の溶鋼５はスライディングノ
ズル１４と浸漬ノズル６を介して鋳型１内に注入され
る。浸漬ノズル６の下端部は鋳型１内の溶鋼５に浸漬さ
れ、浸漬ノズル６の左右一対の吐出孔７から、溶鋼５が
鋳型短辺３に向けて吐出される。鋳型１内に吐出された
溶鋼５は冷却され、凝固シェル１６を生成し、図示しな
いピンチロールにて、鋳型１から下方に連続的に引き抜
かれる。鋳型内溶鋼５のメニスカス１７上にはモールド
パウダー１５が添加されている。A tundish 4 is provided on the upper part of a rectangular mold 1 in which a pair of the long side 2 and the short side 3 of the mold are combined, and the tundish 4 receives molten steel 5 from a ladle (not shown). A sliding nozzle 14 for adjusting the flow rate of molten steel is provided at the bottom of the tundish 4, and the immersion nozzle 6 is attached to the lower surface of the sliding nozzle 14. The molten steel 5 in the tundish 4 is injected into the mold 1 via the sliding nozzle 14 and the immersion nozzle 6. The lower end of the immersion nozzle 6 is immersed in the molten steel 5 in the mold 1, and the molten steel 5 is discharged from the pair of left and right discharge holes 7 of the immersion nozzle 6 toward the short side 3 of the mold. The molten steel 5 discharged into the mold 1 is cooled, forms a solidified shell 16, and is continuously pulled down from the mold 1 by a pinch roll (not shown). A mold powder 15 is added on the meniscus 17 of the molten steel 5 in the mold.
【００２９】両鋳型長辺２の背面には、鋳型長辺２を挟
んで対向する位置にリニア移動磁場発生装置８、８、及
び１０、１０が、浸漬ノズル６を中心として鋳型幅方向
に分割され、配置されている。左側のリニア移動磁場発
生装置８、８は左側の電磁場制御装置９に接続され、
又、右側のリニア移動磁場発生装置１０、１０は右側の
電磁場制御装置１１に接続され、浸漬ノズル６の左右で
独立に磁場を制御できるようになっている。磁場の移動
方向は、浸漬ノズル６から鋳型短辺３に向かう方向と、
その逆の方向に切り替えることができる。リニア移動磁
場発生装置８、８、及び１０、１０の鋳造方向の中心位
置は浸漬ノズル６の吐出孔７下端付近とする。ここで示
す電磁場制御装置９、１１は、電源装置を兼ね備えたも
ので、リニア移動磁場発生装置８、８、及び１０、１０
に印加する電源の電圧値、電流値、周波数値、及び交流
電流の位相を変えることができるもので、周波数は、
０．０５Ｈｚから６０Ｈｚ程度まで変更可能であること
が望ましい。On the back side of both mold long sides 2, linear moving magnetic field generators 8, 8, 10, and 10 are arranged at positions facing each other across the mold long side 2 in the mold width direction with the immersion nozzle 6 as the center. Is being arranged. The left linear moving magnetic field generators 8 and 8 are connected to the left electromagnetic field controller 9,
The right linear moving magnetic field generators 10 and 10 are connected to the right electromagnetic field controller 11 so that the magnetic field can be controlled independently on the left and right sides of the immersion nozzle 6. The moving direction of the magnetic field is the direction from the immersion nozzle 6 toward the mold short side 3,
You can switch in the opposite direction. The center position of the linear moving magnetic field generators 8, 8, 10 and 10 in the casting direction is near the lower end of the discharge hole 7 of the immersion nozzle 6. The electromagnetic field controllers 9 and 11 shown here also have a power supply device, and have linear moving magnetic field generators 8, 8, 10 and 10,
The voltage value, the current value, the frequency value of the power supply to be applied to and the phase of the alternating current can be changed.
It is desirable that the frequency can be changed from 0.05 Hz to about 60 Hz.
【００３０】リニア移動磁場発生装置８、８、及び１
０、１０の鋳型長辺２を挟んで対向する磁極は、その移
動磁場による期待する駆動力の形態に応じ、Ｎ極とＳ極
の異極対向のケースと、Ｎ極、若しくはＳ極の同極対向
のケースにすることができる。即ち、鋳型１厚み全体に
駆動力を作用させる場合には、異極対向が望ましく、且
つこの場合には、大きなブレーキ力が期待できる。他
方、鋳型１の壁近傍のみに駆動力を作用させる場合は、
同極対向とすれば良い。しかし、この場合には、磁束密
度は鋳型１の壁近傍では大きいが、鋳型１厚み中心では
ゼロになるため、ブレーキ力は鋳型１の壁近傍のみしか
期待できない。従って目的に応じて、対向する磁極の特
性を決めれば良い。対向する磁極の特性は、例えば電磁
場制御装置９、１１により印加する電流の位相を切り替
えて行うことができる。Linear moving magnetic field generators 8, 8, and 1
The magnetic poles opposing each other with the long sides 2 of the molds 0 and 10 are different from each other depending on the form of driving force expected by the moving magnetic field. Extremely opposing cases can be provided. That is, when a driving force is applied to the entire thickness of the mold 1, opposing opposite poles are desirable, and in this case, a large braking force can be expected. On the other hand, when a driving force is applied only near the wall of the mold 1,
What is necessary is just to oppose the same pole. However, in this case, the magnetic flux density is large near the wall of the mold 1, but becomes zero at the center of the thickness of the mold 1, so that the braking force can be expected only in the vicinity of the wall of the mold 1. Therefore, the characteristics of the opposing magnetic poles may be determined according to the purpose. The characteristics of the opposing magnetic poles can be determined by, for example, switching the phase of the current applied by the electromagnetic field controllers 9 and 11.
【００３１】このような構成からなる溶鋼流動制御装置
において、移動磁場の磁束密度はリニア移動磁場発生装
置８、８、及び１０、１０に印加する電流又は電圧を鋳
造中に増減することで制御し、リニア移動磁場の周波数
ｆは印加する交流電流の周波数を鋳造中に変更して制御
し、又、左右のリニア移動磁場発生装置８、８、及び１
０、１０に印加する交流電流の位相は０〜１８０度の範
囲で鋳造中に相対的に変更して印加する。In the molten steel flow control device having such a configuration, the magnetic flux density of the moving magnetic field is controlled by increasing or decreasing the current or voltage applied to the linear moving magnetic field generators 8, 8, 10 and 10 during casting. The frequency f of the linear moving magnetic field is controlled by changing the frequency of the applied alternating current during casting, and the left and right linear moving magnetic field generators 8, 8, and 1 are controlled.
The phase of the alternating current applied to 0 and 10 is relatively changed during casting in the range of 0 to 180 degrees and applied.
【００３２】[0032]
〔実施例１〕ＤＩ缶用素材として使用され、鋼板の高清
浄性が要求される炭素濃度が０．０３ｗｔ％程度の低炭
素Ａｌキルド鋼に本発明を適用した。[Example 1] The present invention was applied to a low-carbon Al-killed steel having a carbon concentration of about 0.03 wt%, which is used as a material for DI can and requires high cleanliness of a steel sheet.
【００３３】本実施例では、前述した図１の溶鋼流動制
御装置に、更に湯面レベル計１２、１２と演算装置１３
とを加えた装置にて実施した。即ち、図１に示すよう
に、鋳型内溶鋼５の上には湯面レベル計１２、１２が浸
漬ノズル６を挟んで鋳型幅方向の左右対称な位置に１個
ずつ設置され、鋳型内湯面変動を測定している。湯面レ
ベル計１２、１２の測定信号は演算器１３に入力され、
鋳型内の湯面変動に応じ、電磁場制御装置９、１１に信
号を出力することができるようになっている。In the present embodiment, the molten steel flow control device shown in FIG.
And was added to the apparatus. That is, as shown in FIG. 1, on the molten steel 5 in the mold, level gauges 12, 12 are installed one by one at symmetrical positions in the width direction of the mold with the immersion nozzle 6 interposed therebetween. Is measured. The measurement signals of the level gauges 12 and 12 are input to a calculator 13,
A signal can be output to the electromagnetic field control devices 9 and 11 according to the fluctuation of the molten metal level in the mold.
【００３４】又、左右のリニア移動磁場発生装置の鋳造
方向中心位置は浸漬ノズル吐出孔下端から１５０ｍｍの
位置として、磁場の移動方向は鋳型短辺から浸漬ノズル
の方向とし、異極が対向するように配置した。The center of the left and right linear moving magnetic field generators in the casting direction is set at a position 150 mm from the lower end of the immersion nozzle discharge hole, and the magnetic field is moved from the short side of the mold to the immersion nozzle. Was placed.
【００３５】鋳造条件は、鋳片幅１５５０ｍｍ、鋳片厚
み２３０ｍｍ、鋳片引抜き速度は２．０ｍ／ｍｉｎであ
る。The casting conditions were a slab width of 1550 mm, a slab thickness of 230 mm, and a slab drawing speed of 2.0 m / min.
【００３６】左右のリニア移動磁場発生装置共、鋳型中
心における磁束密度が実効値で３１００ガウスになるよ
うに電流値を設定し、電流周波数は０．１５Ｈｚとし、
又、左右のリニア移動磁場発生装置に印加する交流電流
の位相差は０度の条件で鋳造を開始した。The current value of both the left and right linear moving magnetic field generators is set so that the magnetic flux density at the center of the mold becomes an effective value of 3100 gauss, and the current frequency is 0.15 Hz.
Casting was started under the condition that the phase difference of the alternating current applied to the left and right linear moving magnetic field generators was 0 degrees.
【００３７】鋳造中に、湯面レベル計の浸漬ノズル左右
の測定値を比較し、左右のメニスカスに３ｍｍ以上の差
が生じた場合に、湯面レベルの高い側のリニア移動磁場
発生装置の周波数を増加し、同時に低い側のリニア移動
磁場発生装置の周波数を減少した。このようにしてメニ
スカスの変動状況に応じて交流電流の周波数を０．０５
〜０．３Ｈｚの範囲内で最適値となるように制御した。During casting, the measured values of the left and right immersion nozzles of the level gauge are compared, and if a difference of 3 mm or more occurs between the left and right meniscuses, the frequency of the linear moving magnetic field generator on the higher level of the level is measured. And at the same time decreased the frequency of the lower side linear moving magnetic field generator. In this way, the frequency of the alternating current is set to 0.05 in accordance with the fluctuation state of the meniscus.
Control was performed so that the optimum value was obtained within a range of 0.3 Hz.
【００３８】同時に、湯面レベル計の信号で、浸漬ノズ
ルの左右でメニスカスが周期的に上下且つ交互に振動す
ることを確認すると、左右のリニア移動磁場発生装置に
印加する交流電流の位相差を相対的に徐々に増加した。
位相差の変更は０から１８０度まで相対的に変更した。At the same time, when it is confirmed from the signal of the level gauge that the meniscus periodically vibrates alternately up and down on the left and right of the immersion nozzle, the phase difference of the alternating current applied to the left and right linear moving magnetic field generators is determined. Increased relatively gradually.
The phase difference was changed relatively from 0 to 180 degrees.
【００３９】本実施例では、印加した周波数が低いにも
かかわらず、周波数が低い場合に発生する鋳型左右の周
期的な湯面の上下振動変動は、左右のリニア移動磁場発
生装置に印加する電流の位相を相対的に変化させること
によって防止でき、且つ、湯面下近傍に適正な流れを形
成することができた。位相の相対的な変化は３０〜１５
０度の範囲で変更すると左右の周期的な湯面変動は回避
できた。In this embodiment, although the applied frequency is low, the vertical fluctuation of the mold surface on the left and right sides which occurs when the frequency is low is caused by the current applied to the left and right linear moving magnetic field generators. Can be prevented by relatively changing the phase, and an appropriate flow can be formed near the surface of the molten metal. The relative change in phase is 30-15
If the angle was changed within the range of 0 degrees, the periodic fluctuation of the left and right molten metal level could be avoided.
【００４０】鋳造された鋳片を薄鋼板に圧延し、薄鋼板
において超音波探傷試験にてモールドパウダー及び脱酸
生成物を起因とする非金属介在物の欠陥を調査した。非
金属介在物の欠陥発生率は、後述する比較例における欠
陥発生率を１．０として比較すると０．６となった。The cast slab was rolled into a thin steel sheet, and defects in the non-metallic inclusions caused by the mold powder and deoxidation products were examined in the thin steel sheet by ultrasonic testing. The defect occurrence rate of nonmetallic inclusions was 0.6 when the defect occurrence rate in a comparative example described later was set to 1.0.
【００４１】このように、鋳造中に印加する周波数を変
更することで吐出流速度を左右で均等にすることがで
き、且つ、位相を変更することで周期的な湯面変動を防
止することができるので、メニスカス直下近傍の流れの
最適化が得られ、又、磁束密度を高い状態に保持できる
ので、吐出流速の鋳型下方方向の制動効果が得られ、そ
の結果、アルミナを主体とする脱酸生成物や、モールド
パウダー等の凝固殻への補足防止と浮上促進が図られ、
内部及び表面ともに極めて清浄な鋳片を得ることができ
た。As described above, by changing the frequency applied during casting, the discharge flow velocity can be made uniform between the left and right, and by changing the phase, periodic fluctuations in the molten metal level can be prevented. As a result, the flow near the meniscus can be optimized, and the magnetic flux density can be maintained at a high level. As a result, the effect of damping the discharge flow velocity in the mold downward direction can be obtained. Prevention of product and solidification shell such as mold powder, etc. are prevented and floating is promoted.
Extremely clean slabs were obtained both inside and on the surface.
【００４２】〔実施例２〕実施例１と同一な鋼種、及
び、装置にて本発明を適用した。[Embodiment 2] The present invention was applied to the same steel type and apparatus as in Embodiment 1.
【００４３】鋳造条件は、鋳片幅１５５０ｍｍ、鋳片厚
み２３０ｍｍ、鋳片引抜き速度は１．５ｍ／ｍｉｎであ
る。The casting conditions were a slab width of 1550 mm, a slab thickness of 230 mm, and a slab drawing speed of 1.5 m / min.
【００４４】左右のリニア移動磁場発生装置共、鋳型中
心における磁束密度が実効値で２２００ガウスになるよ
うに電流値を設定し、電流周波数は０．５Ｈｚとし、
又、左右のリニア移動磁場発生装置に印加する交流電流
の位相差は０度の条件で鋳造を開始した。The current value of both the right and left linear moving magnetic field generators is set so that the magnetic flux density at the center of the mold becomes an effective value of 2200 gauss, and the current frequency is 0.5 Hz.
Casting was started under the condition that the phase difference of the alternating current applied to the left and right linear moving magnetic field generators was 0 degrees.
【００４５】鋳造中に、湯面レベル計の浸漬ノズル左右
の測定値を比較し、左右のメニスカスに３ｍｍ以上の差
が生じた場合に、湯面レベルの高い側のリニア移動磁場
発生装置の周波数を増加し、同時に低い側のリニア移動
磁場発生装置の周波数を減少した。このようにしてメニ
スカスの変動状況に応じて交流電流の周波数を０．１〜
０．８Ｈｚの範囲内で最適値となるように制御した。During casting, the measured values of the left and right immersion nozzles of the level gauge are compared, and if a difference of 3 mm or more occurs between the left and right meniscuses, the frequency of the linear moving magnetic field generator on the higher level of the level is measured. And at the same time decreased the frequency of the lower side linear moving magnetic field generator. In this way, the frequency of the alternating current is set to 0.1 to
Control was performed so that the optimum value was obtained within a range of 0.8 Hz.
【００４６】同時に、湯面レベル計の信号で、浸漬ノズ
ルの左右でメニスカスが周期的に上下且つ交互に振動す
ることを確認すると、左右のリニア移動磁場発生装置に
印加する交流電流の位相差を相対的に徐々に増加した。
位相差の変更は０から１８０度まで相対的に変更した。At the same time, when it is confirmed that the meniscus periodically vibrates up and down and alternately on the left and right sides of the immersion nozzle by the signal of the level gauge, the phase difference of the alternating current applied to the left and right linear moving magnetic field generators is determined. Increased relatively gradually.
The phase difference was changed relatively from 0 to 180 degrees.
【００４７】印加する電流が０．５Ｈｚ以下の低周波時
には、左右のリニア移動磁場発生装置に印加する位相に
変化のない場合は、メニスカスの上下振動が発生した
が、交流電流の位相を相対的に変化させることで防止す
ることができた。又、０．５Ｈｚ以上の周波数では、電
流の位相変化なしでも、メニスカスの上下振動は、ほと
んど発生しなかった。When the applied current is at a low frequency of 0.5 Hz or less, if the phase applied to the left and right linear moving magnetic field generators does not change, a vertical oscillation of the meniscus occurs. It was able to prevent by changing to. At a frequency of 0.5 Hz or more, the vertical vibration of the meniscus hardly occurred even without a phase change of the current.
【００４８】鋳造された鋳片を薄鋼板に圧延し、薄鋼板
において超音波探傷試験にてモールドパウダー及び脱酸
生成物を起因とする非金属介在物の欠陥を調査した。非
金属介在物の欠陥発生率は、後述する比較例における欠
陥発生率を１．０として比較すると、０．５５となっ
た。The cast slab was rolled into a thin steel plate, and defects in the non-metallic inclusions caused by the mold powder and deoxidation products were examined in the thin steel plate by an ultrasonic inspection test. The defect occurrence rate of the nonmetallic inclusions was 0.55 when the defect occurrence rate in a comparative example described later was set to 1.0.
【００４９】本実施例の適用効果は、実施例１と同様
に、浸漬ノズルからの吐出流の沈静化に威力を発揮し、
内部及び表面共に極めて高清浄な鋳片が得られた。た
だ、本実施例では、磁場の移動方向以外に向かう流れに
対する制動効果は、実施例１に比較して小さいため、浸
漬ノズルからの吐出速度の小さい、すなわち鋳造速度の
低いケースでその大きな効果が期待できる。The effect of the present embodiment is, as in the first embodiment, effective in calming the discharge flow from the immersion nozzle.
Extremely clean slabs were obtained both inside and on the surface. However, in the present embodiment, the braking effect on the flow flowing in a direction other than the moving direction of the magnetic field is smaller than that in the first embodiment. Can be expected.
【００５０】〔実施例３〕実施例１と同一な鋼種、及
び、装置にて本発明を適用した。但し、本実施例では、
湯面レベル計は湯面変動を測定するのみであり、測定し
た信号は電磁場制御装置にフィードバックしていない。[Embodiment 3] The present invention was applied to the same steel type and apparatus as in Embodiment 1. However, in this embodiment,
The level gauge only measures the level fluctuation, and the measured signal is not fed back to the electromagnetic field controller.
【００５１】鋳造条件は、鋳片幅１５５０ｍｍ、鋳片厚
み２３０ｍｍ、鋳片引抜き速度は２．０ｍ／ｍｉｎであ
る。The casting conditions were a slab width of 1550 mm, a slab thickness of 230 mm, and a slab drawing speed of 2.0 m / min.
【００５２】本実施例では、印加する電流の周波数を
０．２〜１．２Ｈｚの範囲内で連続的に変化させ、同時
に、磁場移動方向の駆動力が一定になるように、即ち、
磁束密度の２乗と周波数との積が一定になるように、周
波数の変化に応じて自動的に印加電流を変化させて磁束
密度を３１００ガウスから１２７０ガウスまで変更し
た。尚、交流電流の周波数の変更は、最低周波数の約１
周期に相当する時間（約５秒間）で０．２Ｈｚから１．
２Ｈｚまで連続的に変化させた。In the present embodiment, the frequency of the applied current is continuously changed within the range of 0.2 to 1.2 Hz, and at the same time, the driving force in the direction of moving the magnetic field becomes constant.
The magnetic flux density was changed from 3100 gauss to 1270 gauss by automatically changing the applied current according to the frequency change so that the product of the square of the magnetic flux density and the frequency becomes constant. The frequency of the alternating current should be changed by about 1
From 0.2 Hz to 1. at a time corresponding to the cycle (about 5 seconds).
It was continuously changed to 2 Hz.
【００５３】本実施例においては、メニスカスの上下振
動の共振現象が完成する時間以内に周波数が連続的に変
化するため、位相制御を取り入れるまでもなく鋳型内の
液面レベルは極めて平静であった。In this embodiment, since the frequency continuously changes within the time when the resonance phenomenon of the vertical vibration of the meniscus is completed, the liquid level in the mold was extremely calm without incorporating phase control. .
【００５４】鋳造された鋳片を薄鋼板に圧延し、薄鋼板
において超音波探傷試験にてモールドパウダー及び脱酸
生成物を起因とする非金属介在物の欠陥を調査した。非
金属介在物の欠陥発生率は、後述する比較例における欠
陥発生率を１．０として比較すると０．７となった。The cast slab was rolled into a thin steel sheet, and defects in the non-metallic inclusions caused by the mold powder and deoxidation products were examined in the thin steel sheet by an ultrasonic inspection test. The defect occurrence rate of the nonmetallic inclusions was 0.7 when the defect occurrence rate in a comparative example described later was set to 1.0.
【００５５】本実施例でも、実施例１、２と同様に内部
及び表面共に、清浄な鋳片が得られた。In this example, as in Examples 1 and 2, clean slabs were obtained on both the inside and the surface.
【００５６】尚、磁場の移動方向に対して更に大きな駆
動力を必要とする場合は、周波数を本実施例よりも高い
範囲で変動させれば良く、逆に、駆動力が大き過ぎる場
合は、本実施例より更に低い範囲で周波数を変動させれ
ば良い。When a larger driving force is required in the moving direction of the magnetic field, the frequency may be changed in a higher range than in the present embodiment. Conversely, when the driving force is too large, The frequency may be changed in a lower range than in the present embodiment.
【００５７】〔比較例〕実施例１と同一な鋼種、及び、
装置にて実施した。鋳造条件は、鋳片幅１５５０ｍｍ、
鋳片厚み２３０ｍｍ、鋳片引抜き速度２．０ｍ／ｍｉｎ
である。[Comparative Example] The same steel type as in Example 1 and
The test was carried out using an apparatus. The casting conditions were slab width 1550 mm,
Slab thickness 230mm, Slab drawing speed 2.0m / min
It is.
【００５８】左右のリニア移動磁場発生装置共、鋳型中
心における磁束密度が実効値で１０００ガウスになるよ
うに電流値を設定し、電流の周波数を１．０Ｈｚの一定
条件として、左右のリニア移動磁場発生装置に印加する
交流電流の位相は同一の条件で鋳造を開始した。In both the left and right linear moving magnetic field generators, the current value is set so that the magnetic flux density at the center of the mold becomes an effective value of 1000 gauss, and the left and right linear moving magnetic field is set to a constant frequency of 1.0 Hz. Casting was started under the same conditions for the phase of the alternating current applied to the generator.
【００５９】鋳造中に、湯面レベル計の浸漬ノズル左右
の測定値を比較し、左右のメニスカスに３ｍｍ以上の差
が生じた場合に、湯面レベルの高い側のリニア移動磁場
発生装置の電流を増加し、同時に低い側のリニア移動磁
場発生装置の電流を減少した。このようにしてメニスカ
スの変動状況に応じて交流電源の電流値を変更して、鋳
型中心における磁束密度が実効値で３００〜１２００ガ
ウスの範囲内で制御した。During casting, the measured values of the left and right immersion nozzles of the level gauge are compared, and if a difference of 3 mm or more occurs between the left and right meniscuses, the current of the linear moving magnetic field generator on the higher level of the level is measured. And at the same time decreased the current of the lower side linear moving magnetic field generator. In this way, the current value of the AC power supply was changed in accordance with the fluctuation state of the meniscus, and the magnetic flux density at the center of the mold was controlled within an effective value of 300 to 1200 gauss.
【００６０】鋳造された鋳片を薄鋼板に圧延し、薄鋼板
において超音波探傷試験にてモールドパウダー及び脱酸
生成物を起因とする非金属介在物の欠陥を調査した。そ
して、この欠陥発生率を１．０として、本発明の実施例
と比較した。比較例では、磁束密度が小さくなる時期に
該当する鋳片で、主に脱酸生成物であるアルミナによる
欠陥発生率が高い。これは、磁束密度が小さくなる時期
に鋳型下方方向の溶鋼の制動力が弱くなり、吐出流が未
凝固層深くにまで進入したものと考える。The cast slab was rolled into a thin steel sheet, and defects in the non-metallic inclusions caused by the mold powder and deoxidation products were examined in the thin steel sheet by an ultrasonic inspection test. Then, the defect occurrence rate was set to 1.0 and compared with the embodiment of the present invention. In the comparative example, in the slab corresponding to the period when the magnetic flux density becomes small, the defect generation rate mainly due to alumina which is a deoxidation product is high. This is thought to be due to the fact that the braking force of the molten steel in the lower direction of the mold became weaker at the time when the magnetic flux density became smaller, and the discharge flow penetrated deep into the unsolidified layer.
【００６１】[0061]
【発明の効果】本発明によれば、浸漬ノズルからの吐出
流の沈静化に加え、リニア移動磁場による鋳型内流動の
最適化が図られ、モールドパウダーの巻き込み防止と脱
酸生成物の浮上促進が実現した結果、鋳片幅方向全体に
わたって内部及び表面共に極めて清浄な鋳片を得ること
ができる。According to the present invention, in addition to calming the discharge flow from the immersion nozzle, the flow in the mold is optimized by the linear moving magnetic field, thereby preventing the entrainment of the mold powder and promoting the floating of deoxidized products. As a result, extremely clean slabs can be obtained both inside and on the surface over the entire slab width direction.
【図１】本発明を適用した矩形型鋳型を用いた連続鋳造
機の鋳型部の概要を示した図で、（ａ）は側断面図、
（ｂ）は平面図である。FIG. 1 is a view showing an outline of a mold part of a continuous casting machine using a rectangular mold to which the present invention is applied, (a) is a side sectional view,
(B) is a plan view.
１：鋳型 ２：鋳型長辺 ３：鋳型短辺 ４：タンディッシュ ５：溶鋼 ６：浸漬ノズル ７：吐出孔 ８：左側のリニア移動磁場発生装置 ９：左側の電磁場制御装置 １０：右側のリニア移動磁場発生装置 １１：右側の電磁場制御装置 １２：湯面レベル計 １３：演算機 １４：スライディングノズル １５：モールドパウダー １６：凝固シェル １７；メニスカス 1: Mold 2: Mold long side 3: Mold short side 4: Tundish 5: Molten steel 6: Immersion nozzle 7: Discharge hole 8: Left side linear moving magnetic field generator 9: Left side electromagnetic field controller 10: Right side linear movement Magnetic field generator 11: Right electromagnetic field controller 12: Level gauge 13: Computer 14: Sliding nozzle 15: Mold powder 16: Solidified shell 17; Meniscus
フロントページの続き (72)発明者 石井 俊夫 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 (72)発明者 久保田 淳 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内Continued on the front page (72) Inventor Toshio Ishii 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Inside Nihon Kokan Co., Ltd. (72) Inventor Atsushi Kubota 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Stock In company
Claims (4)
ア移動磁場発生装置にて磁場を印加して鋳型内の溶鋼流
動を制御する方法において、磁束密度と移動磁場の周波
数とを鋳造中に独立に変更することを特徴とする連続鋳
造鋳型内の溶鋼流動制御方法。1. A method for controlling the flow of molten steel in a mold by applying a magnetic field with a linear moving magnetic field generator in which a moving direction of a magnetic field is a mold width direction, wherein a magnetic flux density and a frequency of a moving magnetic field are determined during casting. A method for controlling molten steel flow in a continuous casting mold, wherein the method is independently changed.
ア移動磁場発生装置にて磁場を印加して鋳型内の溶鋼流
動を制御する方法において、磁場の磁束密度の２乗と移
動磁場の周波数との積が一定の条件で、磁束密度と移動
磁場の周波数とを鋳造中に連続的に変更することを特徴
とする連続鋳造鋳型内の溶鋼流動制御方法。2. A method for controlling the flow of molten steel in a mold by applying a magnetic field with a linear moving magnetic field generator in which the moving direction of the magnetic field is the width direction of the mold, the square of the magnetic flux density of the magnetic field and the frequency of the moving magnetic field. The flow rate of the molten steel in the continuous casting mold, wherein the magnetic flux density and the frequency of the moving magnetic field are continuously changed during the casting under a condition that the product of the magnetic flux and the moving magnetic field is constant.
に２分割され、磁場の移動方向が鋳型幅方向であるリニ
ア移動磁場発生装置にて左右独立に磁場を印加して鋳型
内の溶鋼流動を制御する方法において、２分割された左
右のリニア移動磁場発生装置に印加する交流電流の位相
を鋳造中に相対的に変化させることを特徴とする連続鋳
造鋳型内の溶鋼流動制御方法。3. A linear moving magnetic field generator in which the magnetic field moves in the mold width direction is divided into two parts in the mold width direction right and left with the immersion nozzle as a center. A method for controlling the flow of molten steel in a continuous casting mold, wherein the phase of an alternating current applied to the left and right divided linear moving magnetic field generators is relatively changed during casting.
に２分割され、磁場の移動方向が鋳型幅方向であるリニ
ア移動磁場発生装置にて左右独立に磁場を印加して鋳型
内の溶鋼流動を制御する方法において、２分割された左
右のリニア移動磁場発生装置に印加する交流電流の位相
を鋳造中に相対的に変化させると共に、磁束密度と移動
磁場の周波数とを鋳造中に独立に変更することを特徴と
する連続鋳造鋳型内の溶鋼流動制御方法。4. A linear moving magnetic field generator in which the magnetic field moves in the mold width direction is divided into two parts in the mold width direction left and right with the immersion nozzle as the center, and the magnetic field is applied independently to the left and right to control the flow of molten steel in the mold. In the control method, the phase of the alternating current applied to the two divided left and right linear moving magnetic field generators is relatively changed during casting, and the magnetic flux density and the frequency of the moving magnetic field are independently changed during casting. A method for controlling the flow of molten steel in a continuous casting mold, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16652696A JP3240927B2 (en) | 1996-06-27 | 1996-06-27 | Method for controlling molten steel flow in continuous casting mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16652696A JP3240927B2 (en) | 1996-06-27 | 1996-06-27 | Method for controlling molten steel flow in continuous casting mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH105945A true JPH105945A (en) | 1998-01-13 |
| JP3240927B2 JP3240927B2 (en) | 2001-12-25 |
Family
ID=15832951
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16652696A Expired - Fee Related JP3240927B2 (en) | 1996-06-27 | 1996-06-27 | Method for controlling molten steel flow in continuous casting mold |
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| Country | Link |
|---|---|
| JP (1) | JP3240927B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005042186A1 (en) * | 2003-10-27 | 2005-05-12 | Siemens Aktiengesellschaft | Device and method for electromagnetically stirring or slowing down cast metal, especially continuously cast steel |
| JP2005238319A (en) * | 2004-02-27 | 2005-09-08 | Jfe Steel Kk | Steel continuous casting method and continuous casting apparatus |
| JP2006082092A (en) * | 2004-09-14 | 2006-03-30 | Jfe Steel Kk | Steel continuous casting method |
| JP2006281314A (en) * | 2005-03-11 | 2006-10-19 | Jfe Steel Kk | Steel continuous casting method |
| CN115971438A (en) * | 2022-12-08 | 2023-04-18 | 攀钢集团攀枝花钢铁研究院有限公司 | A Control Method for Reducing Liquid Level Fluctuation of Peritectic Steel |
-
1996
- 1996-06-27 JP JP16652696A patent/JP3240927B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005042186A1 (en) * | 2003-10-27 | 2005-05-12 | Siemens Aktiengesellschaft | Device and method for electromagnetically stirring or slowing down cast metal, especially continuously cast steel |
| JP2005238319A (en) * | 2004-02-27 | 2005-09-08 | Jfe Steel Kk | Steel continuous casting method and continuous casting apparatus |
| JP2006082092A (en) * | 2004-09-14 | 2006-03-30 | Jfe Steel Kk | Steel continuous casting method |
| JP2006281314A (en) * | 2005-03-11 | 2006-10-19 | Jfe Steel Kk | Steel continuous casting method |
| CN115971438A (en) * | 2022-12-08 | 2023-04-18 | 攀钢集团攀枝花钢铁研究院有限公司 | A Control Method for Reducing Liquid Level Fluctuation of Peritectic Steel |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3240927B2 (en) | 2001-12-25 |
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