JPH05200513A - Method for continuously casting metal - Google Patents
Method for continuously casting metalInfo
- Publication number
- JPH05200513A JPH05200513A JP1536992A JP1536992A JPH05200513A JP H05200513 A JPH05200513 A JP H05200513A JP 1536992 A JP1536992 A JP 1536992A JP 1536992 A JP1536992 A JP 1536992A JP H05200513 A JPH05200513 A JP H05200513A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- lubricant
- metal
- coil
- continuous casting
- 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
Links
Landscapes
- Continuous Casting (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、金属の連続鋳造時に発
生する鋳片の表面欠陥、特にタンディッシュと鋳型を直
結した鋳造装置(以下、直結型連続鋳造装置と記す)を
用いて鋳造する際、溶融金属の供給ノズル(以下、給湯
ノズルと記す)、鋳型および溶融金属が同時に接する部
分(以下、三重点と記す)から発生する表面欠陥を防止
する金属の連続鋳造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to surface defects of a slab generated during continuous casting of metal, particularly casting using a casting device in which a tundish and a mold are directly connected (hereinafter referred to as a direct-connection type continuous casting device). At this time, the present invention relates to a continuous metal casting method for preventing surface defects generated from a molten metal supply nozzle (hereinafter referred to as a hot water supply nozzle) and a portion where a mold and molten metal are simultaneously in contact with each other (hereinafter referred to as a triple point).
【0002】[0002]
【従来の技術】従来、連続鋳造では、タンディッシュか
ら長い浸漬ノズルを介して溶融金属を供給するという方
法が多く用いられているが、この方法では、大気との遮
断が充分ではなく、溶融金属たとえば、溶鋼の必要以上
の流動による介在物の巻き込み、ノズル閉塞あるいは薄
スラブの製造が困難である等の問題がある。これらの問
題を解消するため、直結型連続鋳造装置による鋳造方法
が用いられるのであるが、この方法による鋳片の品質向
上と鋳込速度の高速化のために、例えば特開昭51-65023
号公報および特開昭58-356号公報等に電磁力を利用する
方法が提示されている。2. Description of the Related Art Conventionally, in continuous casting, a method of supplying molten metal from a tundish through a long dipping nozzle has been often used. However, this method does not sufficiently block the atmosphere and the molten metal. For example, there is a problem that inclusion of inclusions due to excessive flow of molten steel, nozzle clogging, or difficulty in manufacturing thin slabs. In order to solve these problems, a casting method using a direct-connection type continuous casting apparatus is used. To improve the quality of the slab and increase the casting speed by this method, for example, Japanese Patent Laid-Open No. 51-65023.
Japanese Patent Laid-Open Publication No. 58-356 and Japanese Patent Laid-Open Publication No. 58-356 disclose methods of utilizing electromagnetic force.
【0003】上記特開昭51-65023号公報に記載の方法
は、鋳型の上流部に通電コイルを設け、これに交流電流
を供給して電磁的ピンチ力を発生させ、この力によって
溶融金属を特定の空間に閉じ込めたり開孔部や継ぎ目へ
の流入を抑止し、安定した連続鋳造を行おうとする方法
であるが、未だ隙間のシールという考え方に留まってお
り、更にこの方法で実操業を行うには、コイルと鋳型の
形状および配置の改良により、三重点近傍の溶融金属面
における誘導電流の局部的高密度化をはかる必要があ
る。しかし、この高密度化を実施すると、同時にジュー
ル発熱量が増加するのでコイルと溶融金属の効果的な冷
却を行う方法を付加しなければならず、さらに解決すべ
き問題が生ずる。In the method described in Japanese Patent Laid-Open No. 51-65023, an energizing coil is provided on the upstream side of the mold, and an alternating current is supplied to the energizing coil to generate an electromagnetic pinch force, which melts the molten metal. This is a method of confining it in a specific space or suppressing the inflow to holes or joints for stable continuous casting, but it is still the idea of sealing gaps, and this method is also used for actual operation. In order to improve the shape and arrangement of the coil and the mold, it is necessary to locally densify the induced current on the molten metal surface near the triple point. However, if this densification is carried out, the heat value of Joule increases at the same time, and therefore a method for effectively cooling the coil and the molten metal must be added, which causes a problem to be solved.
【0004】特開昭58-356号公報に記載の方法は、水平
連続鋳造を対象にしたもので、タンディッシュに臨む鋳
型面付近に磁場発生用通電コイルを配し鋳型とタンディ
ッシュの接合面から溶融金属を排除して鋳造の高速化を
図ろうとするものである。しかし、この設備を用いた場
合にも前記特開昭51-65023号公報に記載の方法と同様な
問題を有している。The method described in Japanese Patent Laid-Open No. 58-356 is intended for horizontal continuous casting, in which an energizing coil for magnetic field generation is arranged near the surface of the mold facing the tundish, and the joining surface of the mold and the tundish is joined. It aims to speed up casting by eliminating molten metal from the. However, even when this equipment is used, it has the same problems as the method described in the above-mentioned JP-A-51-65023.
【0005】特に特開昭51-65023号公報に記載の装置の
ように耐火物製ノズル、金属製鋳型および溶融金属によ
る三重点ができる場合には鋳型による冷却のために耐火
物の鋳型に隣接する部分に凝固シェルが成長して固着す
る。この凝固シェルは鋳造とともに引き抜かれるので耐
火物が破損し、これが原因となって鋳片表面に欠陥が発
生することが多い。三重点における表面欠陥を防止する
には溶融金属をここから排除するのがよいが、このため
には鋳型内部における、いわば無効な誘導電流の発生を
抑制するとともに、コイルをできるだけ鋳型に接近させ
る必要がある。In particular, when a refractory nozzle, a metal mold, and a triple point by molten metal are formed as in the apparatus described in JP-A-51-65023, it is adjacent to the refractory mold for cooling by the mold. The solidified shell grows and adheres to the part to be covered. Since the solidified shell is pulled out along with casting, the refractory is damaged, and this often causes defects on the surface of the slab. In order to prevent surface defects at the triple points, it is better to remove molten metal from here, but for this purpose it is necessary to suppress the generation of so-called invalid induced current inside the mold and to bring the coil as close to the mold as possible. There is.
【0006】しかし、通電コイルを鋳型の上流側から鋳
型に近づけ過ぎると短絡を起こしたり、鋳型のコーナー
に集中してジュール熱が発生する等の問題も起こる。し
たがってコイルで発生するピンチ力を鋳型の上流側か
ら、溶融金属表面に作用させる上記方法では、三重点か
ら溶融金属を確実に排除することは困難であり、またこ
のため潤滑剤の供給が円滑に行えなくなって、はなはだ
しい場合にはブレークアウトを起こす恐れがある。However, if the energizing coil is brought too close to the mold from the upstream side of the mold, short-circuiting may occur, or Joule heat may be generated at the corners of the mold. Therefore, in the above method in which the pinch force generated in the coil is applied to the surface of the molten metal from the upstream side of the mold, it is difficult to reliably remove the molten metal from the triple point, and therefore, the lubricant can be smoothly supplied. If you can't do it, you could break out in extreme cases.
【0007】一方、鋳造の高速化のためには、鋳型と鋳
片との間の潤滑が必要であるが、パウダー状の潤滑剤は
そのままでは細い供給管内での搬送が困難であるため、
代わりにレプシードオイル等の液体潤滑剤を利用する方
法が考えられる。しかし、この方法にも高温鋳型内での
ガス化によるバブリング現象の発生、およびこの現象に
よる凝固シェル破断等の問題が生ずる。On the other hand, in order to increase the speed of casting, it is necessary to lubricate between the mold and the slab, but it is difficult to convey the powdery lubricant as it is in a thin supply pipe.
Instead, a method of using a liquid lubricant such as repseed oil can be considered. However, this method also has problems such as occurrence of a bubbling phenomenon due to gasification in the high temperature mold, and breakage of the solidified shell due to this phenomenon.
【0008】[0008]
【発明が解決しようとする課題】直結型連続鋳造装置で
は、三重点から表面欠陥が発生しやすい。本発明の目的
はこの三重点から溶融金属を排除し、そこに生じた空洞
部に溶融した潤滑剤を供給することにより、表面欠陥の
発生を防止し、高品質の鋳片を高速度で鋳造できる連続
鋳造方法を提供することにある。In the direct connection type continuous casting apparatus, surface defects are likely to occur from the triple point. The object of the present invention is to eliminate molten metal from this triple point and to supply molten lubricant to the cavity formed therein, thereby preventing the occurrence of surface defects and casting high quality slabs at high speed. An object of the present invention is to provide a continuous casting method.
【0009】[0009]
【課題を解決するための手段】本発明者らは、連続鋳造
時に三重点から溶融金属を効果的に排除して(図1の空
洞部P参照)、表面欠陥の発生を防止する手段について
種々検討を重ねた結果、下記の知見を得た。すなわち、 a.通電コイルと溶融金属間に発生するピンチ力を用い
て直接三重点の溶融金属を排除する方法は、誘導電流が
溶融金属より鋳型の方に多く発生するので効果的ではな
い。The present inventors have various means for effectively eliminating molten metal from the triple point during continuous casting (see cavity P in FIG. 1) to prevent the generation of surface defects. As a result of repeated studies, the following findings were obtained. That is, a. The method of directly excluding the molten metal at the triple point by using the pinch force generated between the energizing coil and the molten metal is not effective because the induced current is generated more in the mold than in the molten metal.
【0010】b.通電コイルを用いて鋳型に誘導電流を
積極的に生起させ、それにより二次的に生じる鋳型と溶
融金属間に発生するピンチ力を利用すれば、三重点の溶
融金属を確実に排除できる。B. The induced current is positively generated in the mold using the energizing coil, and the secondary pinch force generated between the mold and the molten metal is utilized, whereby the molten metal at the triple point can be reliably eliminated.
【0011】c.三重点におけるピンチ力を特別に高め
るためには、耐火物製給湯ノズルと接する鋳型の部分に
スリット部を形成し、そこを周回するように通電コイル
を配置すればよい。C. In order to increase the pinch force at the triple points particularly, a slit portion may be formed in the portion of the mold that is in contact with the refractory hot water supply nozzle, and the energizing coil may be arranged so as to surround the slit portion.
【0012】d.上記cの構造とすれば鋳型と通電コイ
ルを近接して配置する必要がないので鋳型とコイルが短
絡するような危険性は小さい。D. With the above structure c, it is not necessary to dispose the mold and the current-carrying coil close to each other, so that the risk of short-circuiting between the mold and the coil is small.
【0013】e.鋳型のスリット部を介して、溶融金属
を排除してできた空洞部に潤滑剤を供給すれば、より安
定した鋳造ができる。E. If a lubricant is supplied to the cavity formed by removing the molten metal through the slit portion of the mold, more stable casting can be performed.
【0014】f.上記スリット部内に埋設した供給管か
ら溶融した潤滑剤を供給すれば更に安定した鋳造ができ
る。F. If the molten lubricant is supplied from the supply pipe embedded in the slit portion, more stable casting can be performed.
【0015】本発明は、これらの知見に基づいてなされ
たものであり、その要旨は次の連続鋳造方法にある。The present invention has been made on the basis of these findings, and its gist resides in the following continuous casting method.
【0016】溶融金属を貯留するタンディッシュと、こ
のタンディッシュと一体のノズルと、このノズルに直結
する鋳造方向に複数本のスリットを有する金属製冷却鋳
型と、この鋳型を周回して高周波電流を通電するコイル
とを備えた連続鋳造装置により、前記スリット部内に埋
設した複数本の供給管から、前記コイルの電磁場によっ
て発生した三重点付近の鋳型内空洞部に、予め加熱溶融
した潤滑剤を供給することを特徴とする直結型連続鋳造
の方法。A tundish for storing molten metal, a nozzle integral with the tundish, a metal cooling mold having a plurality of slits in the casting direction directly connected to the nozzle, and a high-frequency current circulating around the mold. By a continuous casting device equipped with a coil that energizes, from a plurality of supply pipes embedded in the slit part, the preheated and melted lubricant is supplied to the cavity inside the mold near the triple point generated by the electromagnetic field of the coil. A method of direct-coupling continuous casting, characterized by:
【0017】上記の連続鋳造方法において、潤滑剤の供
給管を金属製とすること、または/および潤滑剤に金属
粉を混合することにより、コイルの電磁場によって発生
する誘導電流で潤滑剤を溶融させることが望ましい。In the above continuous casting method, the lubricant supply pipe is made of metal, and / or metal powder is mixed with the lubricant to melt the lubricant with an induction current generated by the electromagnetic field of the coil. Is desirable.
【0018】[0018]
【作用】まず、本発明の方法を実施するための装置を図
に基づいて説明する。図1は、縦型の直結型連続鋳造装
置の1例を示す断面図である。図2は、鋳型のスリット
部内に埋設した潤滑剤供給管の設置例を示す鋳型の一部
の斜視図である。First, an apparatus for carrying out the method of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing an example of a vertical direct-connection type continuous casting device. FIG. 2 is a perspective view of a part of the mold showing an installation example of the lubricant supply pipe embedded in the slit portion of the mold.
【0019】図に示すように、この鋳造装置の耐火物製
タンディッシュ1には、これと一体の給湯ノズル2があ
り、このノズル2に金属製冷却鋳型3が嵌合して直結し
ている。溶融金属13と接する鋳型3の上部、具体的には
ノズル2の下端部の少なくとも空洞部Pを含む部分に
は、鋳型の長手方向に延びるスリット4が複数本形成さ
れ、このスリット4を設けた鋳型部分の外周を通電コイ
ル5が周回するように配置されている。また、鋳型3の
三重点に生ずる空洞部P付近には、耐火物等によって鋳
型と絶縁された金属製の潤滑剤供給管6が複数本埋設さ
れている。これは外部に設置した粉末状潤滑剤(モール
ドパウダー)7の貯留容器8に接続されている。この貯
留容器8には微振動を与える加振機9が取り付けられて
いる。図1および図2において、11は絶縁用耐火物を、
12は凝固シェルをそれぞれ示してしる。As shown in the figure, a refractory tundish 1 of this casting apparatus has a hot water supply nozzle 2 which is integral with the tundish 1, and a metal cooling mold 3 is fitted and directly connected to the nozzle 2. .. A plurality of slits 4 extending in the longitudinal direction of the mold are formed in the upper portion of the mold 3 in contact with the molten metal 13, more specifically, in the lower end portion of the nozzle 2 including at least the cavity P, and the slits 4 are provided. The energizing coil 5 is arranged so as to circulate around the outer periphery of the mold part. In the vicinity of the cavity P formed at the triple point of the mold 3, a plurality of metal lubricant supply pipes 6 insulated from the mold by a refractory material are embedded. This is connected to a storage container 8 for powder lubricant (mold powder) 7 installed outside. A vibration exciter 9 that gives a slight vibration is attached to the storage container 8. 1 and 2, 11 is a refractory for insulation,
12 indicates solidified shells respectively.
【0020】上記の装置を用い、コイル5に通電して高
周波電流による電磁場を印加すると、ピンチ力によって
三重点の溶融金属が排除され、空洞部Pが生ずる。When the coil 5 is energized and an electromagnetic field is applied by a high-frequency current using the above-mentioned device, the pinch force removes the molten metal at the triple point to form the cavity P.
【0021】一方、加振機9を用いて貯留容器8に微振
動を与えるとモールドパウダー7が供給管6内に搬送さ
れる。前記の電磁場によって供給管6部には誘導電流が
発生し、このジュール熱によりモールドパウダー7が溶
融する。粉体のままでは搬送が困難であったモールドパ
ウダーを、このように溶融状態にして供給することがで
き、液体潤滑剤などを使用する場合に発生するガス化、
バブリングの問題を回避することができる。On the other hand, when a slight vibration is applied to the storage container 8 using the vibrator 9, the mold powder 7 is conveyed into the supply pipe 6. Due to the electromagnetic field, an induced current is generated in the supply pipe 6, and the Joule heat melts the mold powder 7. Mold powder, which was difficult to convey as a powder, can be supplied in a molten state in this way, and gasification that occurs when using a liquid lubricant,
The bubbling problem can be avoided.
【0022】潤滑剤供給管6の材質としてはTi等の高融
点金属材料が望ましい。また通電コイルに流す高周波電
流の実効値、もしくは周波数を増加させれば、発生する
ジュール熱も増大するため潤滑剤溶融量の制御が可能と
なる。もしも、ジュール熱のみでは十分にモールドパウ
ダーが溶融しない場合、もしくは搬送供給管内で詰まっ
てしまう場合などは、補助的に予めヒーター10を用いて
モールドパウダーを加熱、溶融させればよい。一方、加
振機9により貯留容器8に与えられる微振動の振動数を
変化させることで、搬送されるモールドパウダーの量が
制御可能であるから、これにより溶融パウダーの供給量
を制御することができる。As the material of the lubricant supply pipe 6, a high melting point metal material such as Ti is desirable. Further, if the effective value or frequency of the high-frequency current flowing through the energizing coil is increased, the Joule heat generated also increases, so that the amount of melted lubricant can be controlled. If the mold powder is not sufficiently melted by the Joule heat alone, or if the mold powder is clogged in the carrier supply pipe, it is possible to auxiliary heat the mold powder beforehand by using the heater 10. On the other hand, since the amount of the mold powder to be conveyed can be controlled by changing the frequency of the microvibration applied to the storage container 8 by the vibrator 9, it is possible to control the supply amount of the molten powder. it can.
【0023】更に、モールドパウダーに鋳片の品質に無
害な金属の粉末を予め混入しておくことが望ましい。供
給管6が前記Ti等の金属製もしくは耐火物等の非金属製
であっても、発生した誘導電流によって、このパウダー
そのものも発熱するため溶融および空洞部Pへの供給が
容易となり、電流値の低減等省エネルギー的効果も生ず
る。Further, it is desirable to previously mix the mold powder with a metal powder that is harmless to the quality of the slab. Even if the supply pipe 6 is made of a metal such as Ti or a non-metal such as a refractory, the induced current also causes the powder itself to generate heat, which facilitates melting and supply to the cavity P, resulting in a current value. Energy saving effects such as reduction of
【0024】このように、本発明の方法を用いれば、直
結型連続鋳造装置において電磁力を利用して三重点から
溶融金属を排除し、これによって生じた空洞部に予め溶
融したモールドパウダーを供給することができ、鋳型表
面の緩冷却効果の促進とあいまって表面欠陥の発生を防
止すると共に、良好な表面性状を有する鋳片の製造が可
能である。As described above, according to the method of the present invention, the molten metal is eliminated from the triple point by utilizing the electromagnetic force in the direct-connection type continuous casting apparatus, and the pre-melted mold powder is supplied to the cavity formed by this. It is possible to prevent the generation of surface defects in combination with the promotion of the slow cooling effect on the mold surface, and it is possible to manufacture a slab having good surface properties.
【0025】また、本発明の方法は、潤滑剤を予め溶融
するための別の新たな熱源や装置を必要とせず、加熱用
ヒーター程度の追加設備で十分であるため、経済的な方
法でもある。Further, the method of the present invention does not require another new heat source or apparatus for preliminarily melting the lubricant, and an additional equipment such as a heater for heating is sufficient, and thus is an economical method. ..
【0026】[0026]
【実施例1】図1および図2に示す装置を用いて、本発
明の方法により溶鋼を対象として丸断面鋳片の連続鋳造
を実施した。装置および鋳込条件は次に示す通りであ
る。Example 1 Using the apparatus shown in FIGS. 1 and 2, continuous casting of round-section cast slab was carried out for molten steel by the method of the present invention. The equipment and casting conditions are as follows.
【0027】 鋳型 :内直径150mm 、肉厚35mm、長さ1000mmスリット :幅0.2 mm、長さ 150mm、32本 通電コイル:外径30mm、肉厚 2mm、巻き数4 電流実効値20000A、周波数20KHz 鋼組成 :C= 0.2%、Mn= 0.4%、Si= 0.3%、P
=0.02%、S=0.02% パウダー :SiO2=33.6%、CaO =35.0%、Al2O3 =
2.7%、MgO = 4.9% Na2O= 9.7%、K2O = 0.5%、F= 3.9%、Fe2O3 =
3.9% MnO = 0.1%、FreeC= 4.1% 融点1130℃ 溶鋼ヘッド :60〜90mm 溶湯ノズル内径 :130mm 溶鋼温度 :1540℃ 鋳造速度 :2.5m/min 潤滑剤供給管 :内径 1mm、外径 3.5mm、(Ti製)32
本 ヒーター設定温度:1000℃ 鋳造は鋳型と通電コイルに常温の冷却水を供給しつつ、
溶鋼をタンディッシュから鋳型内に供給し、2.5m/minの
速度で60秒間引き抜きを行った。金属製の潤滑剤供給管
は図2に示したようにスリット内に設けた細孔に耐火物
で絶縁して埋設した。このとき加振機を調節して潤滑剤
供給管から 4.2g/sec の割合で溶融潤滑剤を供給した。
鋳型内に埋設した熱電対の測温結果から、このとき潤滑
剤供給管の温度は、鋳型内壁より10mmの位置にて約1150
〜1250℃で、潤滑剤は十分溶融していた。鋳造の結果、
電磁力を印加しない時に見られるブレークアウトやコー
ルドシャットに起因する表面欠陥は見られず、良好な品
質の鋳片が得られた。一方、比較のためヒーターの設定
温度を1200℃として潤滑剤を予め溶融させ、電磁力を印
加せずに、その他は上記と同様な条件での鋳造も行った
が、潤滑剤は溶融するものの、三重点付近の鋳型内に空
洞部が形成されないために、潤滑剤の供給が行われず、
正常な鋳込み状態は得られなかった。この結果鋳片表面
にも割れ等の欠陥が見られた。Mold: Inner diameter 150 mm, wall thickness 35 mm, length 1000 mm Slit: Width 0.2 mm, length 150 mm, 32 energizing coil: Outer diameter 30 mm, wall thickness 2 mm, winding number 4 Current effective value 20000 A, frequency 20 KHz steel Composition: C = 0.2%, Mn = 0.4%, Si = 0.3%, P
= 0.02%, S = 0.02% Powder: SiO 2 = 33.6%, CaO = 35.0%, Al 2 O 3 =
2.7%, MgO = 4.9% Na 2 O = 9.7%, K 2 O = 0.5%, F = 3.9%, Fe 2 O 3 =
3.9% MnO = 0.1%, FreeC = 4.1% Melting point 1130 ℃ Molten steel head: 60 to 90mm Molten metal nozzle inner diameter: 130mm Molten steel temperature: 1540 ℃ Casting speed: 2.5m / min Lubricant supply pipe: Inner diameter 1mm, outer diameter 3.5mm, (Made of Ti) 32
Setting temperature of this heater: 1000 ℃ Casting is supplying cooling water at room temperature to the mold and energizing coil.
Molten steel was supplied from the tundish into the mold, and drawn for 60 seconds at a speed of 2.5 m / min. As shown in FIG. 2, the metal lubricant supply pipe was embedded in the pores provided in the slit while being insulated with a refractory material. At this time, the vibration exciter was adjusted to supply the molten lubricant at a rate of 4.2 g / sec from the lubricant supply pipe.
From the temperature measurement result of the thermocouple buried in the mold, the temperature of the lubricant supply pipe at this time was about 1150 at a position 10 mm from the mold inner wall.
At ~ 1250 ° C, the lubricant was fully molten. As a result of casting,
No surface defects due to breakout or cold shut, which were observed when no electromagnetic force was applied, were not seen, and a slab of good quality was obtained. On the other hand, for comparison, the heater was set to 1200 ° C. to melt the lubricant in advance, electromagnetic waves were not applied, and casting was also performed under the same conditions as above, but the lubricant melts, Since no cavity is formed in the mold near the triple point, the lubricant is not supplied,
A normal cast state was not obtained. As a result, defects such as cracks were also found on the surface of the slab.
【0028】[0028]
【実施例2】実施例1と同様の装置を用いて、潤滑剤供
給管を石英管に、更に潤滑剤を平均粒径 150μm のFe粉
を重量比で5%混入したパウダーにそれぞれ変更し、他
の条件は同じとして連続鋳造を実施した。その結果、潤
滑剤と供給管の性能に差は認められず、充分な潤滑剤の
供給が得られた。したがって実施例1の電磁力を印加し
た場合と同様に良好な鋳片が得られた。また、Ti管と上
記Fe粉混入パウダーを併用する方法も実施したが、概ね
20%程度と認められるパウダー自身の発熱向上効果のた
め、更にコイルの周波数もしくは電流実効値を約20%程
度低下させても潤滑剤の溶融および供給は十分行われて
いることを確認した。Example 2 Using the same apparatus as in Example 1, the lubricant supply pipe was changed to a quartz pipe, and the lubricant was changed to a powder in which 5% by weight of Fe powder having an average particle diameter of 150 μm was mixed. Other conditions were the same, and continuous casting was carried out. As a result, no difference was found in the performance of the lubricant and the supply pipe, and sufficient supply of the lubricant was obtained. Therefore, a good cast piece was obtained as in the case of applying the electromagnetic force of Example 1. We also implemented a method that uses a Ti tube and the above-mentioned powder mixed with Fe powder, but
It was confirmed that the lubricant was sufficiently melted and supplied even if the coil frequency or effective current value was further reduced by about 20% due to the heat generation improving effect of the powder itself, which is recognized as about 20%.
【0029】[0029]
【発明の効果】本発明の方法により、三重点に起因する
表面欠陥を防止すると共に、溶融潤滑剤を供給すること
で、焼き付きの防止、緩冷却の促進が実現され、良好な
表面性状を有する鋳片の製造を高速度で行うことが可能
になる。By the method of the present invention, surface defects caused by triple points are prevented, and by supplying a molten lubricant, seizure is prevented and gentle cooling is promoted, and good surface properties are obtained. It enables the production of the slab to be performed at high speed.
【図1】本発明の方法を実施するための、直結型連続鋳
造装置の1例を示す断面図である。FIG. 1 is a cross-sectional view showing an example of a direct connection type continuous casting apparatus for carrying out the method of the present invention.
【図2】本発明の方法を実施するための、鋳型のスリッ
ト部内に埋設する潤滑剤供給管の設置例の一つを示す鋳
型の一部の斜視図である。FIG. 2 is a perspective view of a part of a mold showing one example of installation of a lubricant supply pipe embedded in a slit part of the mold for carrying out the method of the present invention.
1:タンディッシュ 2:給湯ノズル 3:鋳型
4:スリット 5:通電コイル 6:潤滑剤供給管 7:潤滑剤
(モールドパウダー) 8:潤滑剤貯留容器 9:加振機 10:ヒーター 11:絶縁用耐火物 12:凝固シェル 13:溶融金属 P:三重点に生ずる空洞部1: Tundish 2: Hot water nozzle 3: Mold
4: Slit 5: Energizing coil 6: Lubricant supply pipe 7: Lubricant (mold powder) 8: Lubricant storage container 9: Vibrator 10: Heater 11: Insulation refractory 12: Solidified shell 13: Molten metal P : Cavity at triple point
Claims (2)
のタンディッシュと一体のノズルと、このノズルに直結
する鋳造方向に複数本のスリットを有する金属製冷却鋳
型と、この鋳型を周回して高周波電流を通電するコイル
とを備えた連続鋳造装置において、前記スリット内部に
埋設した複数本の供給管を介して、前記コイルの電磁場
によって発生した三重点付近の鋳型内空洞部に、予め加
熱溶融した潤滑剤を供給することを特徴とする溶融金属
の連続鋳造方法。1. A tundish for storing molten metal, a nozzle integral with the tundish, a metal cooling mold having a plurality of slits in the casting direction which are directly connected to the nozzle, and a high-frequency wave circulated around the mold. In a continuous casting device equipped with a coil for passing an electric current, through a plurality of supply pipes embedded inside the slit, in the mold cavity near the triple point generated by the electromagnetic field of the coil, preheated and melted A continuous casting method for molten metal, which comprises supplying a lubricant.
は/および潤滑剤に金属粉を混合することにより、コイ
ルの電磁場によって発生する誘導電流で潤滑剤を溶融さ
せることを特徴とする請求項1の連続鋳造法。2. A lubricant supply pipe is made of metal, and / or a metal powder is mixed with the lubricant, whereby the lubricant is melted by an induction current generated by an electromagnetic field of the coil. The continuous casting method according to claim 1.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1536992A JPH05200513A (en) | 1992-01-30 | 1992-01-30 | Method for continuously casting metal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1536992A JPH05200513A (en) | 1992-01-30 | 1992-01-30 | Method for continuously casting metal |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH05200513A true JPH05200513A (en) | 1993-08-10 |
Family
ID=11886876
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1536992A Pending JPH05200513A (en) | 1992-01-30 | 1992-01-30 | Method for continuously casting metal |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH05200513A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100467233B1 (en) * | 2000-08-31 | 2005-01-24 | 주식회사 포스코 | Continuous casting mold with lubrication injection road |
US20110100582A1 (en) * | 2008-06-30 | 2011-05-05 | Nippon Light Metal Company, Ltd. | Gas pressure controlled casting mold |
JP2014098538A (en) * | 2012-10-15 | 2014-05-29 | Apple Inc | Inline melt control via rf power |
US9873151B2 (en) | 2014-09-26 | 2018-01-23 | Crucible Intellectual Property, Llc | Horizontal skull melt shot sleeve |
-
1992
- 1992-01-30 JP JP1536992A patent/JPH05200513A/en active Pending
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100467233B1 (en) * | 2000-08-31 | 2005-01-24 | 주식회사 포스코 | Continuous casting mold with lubrication injection road |
US20110100582A1 (en) * | 2008-06-30 | 2011-05-05 | Nippon Light Metal Company, Ltd. | Gas pressure controlled casting mold |
US9561539B2 (en) * | 2008-06-30 | 2017-02-07 | Nippon Light Metal Company, Ltd. | Gas pressure controlled casting mold |
JP2014098538A (en) * | 2012-10-15 | 2014-05-29 | Apple Inc | Inline melt control via rf power |
JP2016095127A (en) * | 2012-10-15 | 2016-05-26 | アップル インコーポレイテッド | Inline melt control via rf power |
US9810482B2 (en) | 2012-10-15 | 2017-11-07 | Apple Inc. | Inline melt control via RF power |
US10197335B2 (en) | 2012-10-15 | 2019-02-05 | Apple Inc. | Inline melt control via RF power |
US9873151B2 (en) | 2014-09-26 | 2018-01-23 | Crucible Intellectual Property, Llc | Horizontal skull melt shot sleeve |
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