JPH04138843A - Device and method for continuously casting metal - Google Patents
Device and method for continuously casting metalInfo
- Publication number
- JPH04138843A JPH04138843A JP26082990A JP26082990A JPH04138843A JP H04138843 A JPH04138843 A JP H04138843A JP 26082990 A JP26082990 A JP 26082990A JP 26082990 A JP26082990 A JP 26082990A JP H04138843 A JPH04138843 A JP H04138843A
- Authority
- JP
- Japan
- Prior art keywords
- casting
- mold
- metal
- lubricant
- molten metal
- 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.)
- Granted
Links
- 238000005266 casting Methods 0.000 title claims abstract description 66
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 32
- 239000002184 metal Substances 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000001816 cooling Methods 0.000 claims abstract description 13
- 238000005058 metal casting Methods 0.000 claims description 6
- 238000007654 immersion Methods 0.000 claims description 4
- 229910001338 liquidmetal Inorganic materials 0.000 claims description 4
- 230000007547 defect Effects 0.000 abstract description 8
- 239000000843 powder Substances 0.000 abstract description 8
- 229910000831 Steel Inorganic materials 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- 239000010959 steel Substances 0.000 abstract description 3
- 239000010687 lubricating oil Substances 0.000 abstract 1
- 239000000314 lubricant Substances 0.000 description 35
- 238000009749 continuous casting Methods 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 230000005499 meniscus Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 230000005288 electromagnetic effect Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000002436 steel type Substances 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 101100136092 Drosophila melanogaster peng gene Proteins 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Landscapes
- Continuous Casting (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、熔融金属の連続鋳造に際して、凝固鋳片の
表面欠陥の発生を防止するとともに鋳造操業の安定な立
上りと鋳造の高速化を実現するための金属の連続鋳造装
置および鋳造方法に関する。[Detailed description of the invention] (Industrial application field) This invention prevents the occurrence of surface defects in solidified slabs during continuous casting of molten metal, and achieves stable start-up of casting operations and faster casting. This invention relates to continuous metal casting equipment and casting methods.
（従来の技術）
連続鋳造鋳片の品質向上と鋳造速度の高速化のために、
鋳造時にｉｉ磁力を利用する方法が種々提案されている
（特開昭５２−３２８２４号公報、特開昭６２−２３０
４５９号公報など）。(Conventional technology) In order to improve the quality of continuously cast slabs and increase the casting speed,
Various methods have been proposed to utilize magnetic force during casting (Japanese Unexamined Patent Publication No. 52-32824, Japanese Unexamined Patent Publication No. 62-230).
459, etc.).
特開昭５２−３２８２４号公報の方法は、第１図に示す
ように鋳型１を包囲するように配置され、耐火物７で電
気的に絶縁された通電コイル２に交流電流を供給して溶
融金属４のメニスカス部を湾曲させ、潤滑剤（パウダー
）６の鋳型面への流入を円滑にすると共に初期凝固にお
ける鋳型と鋳片の接触圧を軽減することにより表面性状
の向上を図るものである。The method disclosed in Japanese Patent Application Laid-open No. 52-32824 involves melting by supplying alternating current to a current-carrying coil 2 which is arranged to surround a mold 1 and is electrically insulated by a refractory 7, as shown in FIG. The meniscus portion of the metal 4 is curved to smooth the flow of the lubricant (powder) 6 to the mold surface and to reduce the contact pressure between the mold and the slab during initial solidification, thereby improving the surface quality. .
しかし、この方法では低周波の交流電流が鋳型内を通過
するために潤滑剤６が溶融金属４中に巻き込まれるとい
う新たな問題が発生するとともに、蒲スラブの長辺側で
は磁場が３３遇するために電磁効果が期待できないとい
う問題も存在する。However, with this method, a new problem arises in that the lubricant 6 is caught up in the molten metal 4 because a low-frequency alternating current passes through the mold, and a magnetic field is generated on the long side of the slab. Therefore, there is also the problem that electromagnetic effects cannot be expected.
特開昭６２−２３０４５９号公報に開示されている鋳造
法は潤滑剤を使用しない方法である。第２図はその説明
図で、左側半分は磁場を利用しない場合、右側半分は磁
場を印加した場合である。この方法の基本的な考え方は
、浸漬ノズル３から鋳型１に注入された溶融金属４のメ
ニスカス部を、通電コイル２によるピンチ力で湾曲させ
、鋳型１による一次冷却領域（図中りで示す）を可能な
限り狭く、即ちｈｔ＜ｈ、とじて、冷却水８による二次
冷却のみで鋳造を行うことにより、鋳造に伴う鋳片５の
抜熱速度の変動を回避して鋳肌品質の改善を図るもので
ある。この方法は、比較的密度が小さく、かつ熱伝導と
電気伝導に優れている融点の低いアルミニウムなどの鋳
造には優れた鋳肌品質改善効果を発揮するものと思われ
るが、熱伝導変と電気伝導度が低く、しかも高融点で密
度が大きい鉄などの鋳造に対しては鋳型の焼き付きが問
題になるとともに、仮に鋳造が可能だとしてもブレーク
アウトが発生するので鋳造速度を高めるのは難しいと考
えられる。The casting method disclosed in JP-A-62-230459 does not use a lubricant. FIG. 2 is an explanatory diagram thereof, in which the left half shows the case where no magnetic field is used, and the right half shows the case where a magnetic field is applied. The basic idea of this method is to bend the meniscus part of the molten metal 4 injected into the mold 1 from the immersion nozzle 3 by the pinch force of the energized coil 2, and to bend the meniscus part of the molten metal 4 injected into the mold 1 from the immersion nozzle 3. By keeping ht as narrow as possible, that is, ht<h, and performing casting with only secondary cooling using cooling water 8, fluctuations in the heat removal rate of the slab 5 due to casting can be avoided and the quality of the casting surface can be improved. The aim is to This method is thought to have an excellent effect on improving casting surface quality when casting materials such as aluminum, which has a relatively low density and a low melting point and has excellent thermal and electrical conductivity. When casting materials such as iron, which has low conductivity, high melting point, and high density, mold seizure is a problem, and even if casting is possible, breakouts will occur, making it difficult to increase the casting speed. Conceivable.
（発明が解決しようとするｉｌｌ！！り鋳型内に浸漬ノ
ズルから溶融金属を供給し、鋳型と鋳片の間隙に潤滑剤
を流入させながら凝固鋳片を引抜く電磁力利用の連続鋳
造において、通常用いられる鋳型の外周に通電コイルを
配置した装置では、鋳型内で磁場が減衰するので、溶融
金属の鋳型内表面メニスカス形状を１１節して、潤滑剤
の流入量を制御することは困難である。(The invention aims to solve this problem in continuous casting using electromagnetic force, in which molten metal is supplied from a submerged nozzle into a mold, and a solidified slab is pulled out while a lubricant flows into the gap between the mold and the slab. In a commonly used device in which a current-carrying coil is placed around the outer periphery of a mold, the magnetic field attenuates within the mold, making it difficult to control the amount of lubricant flowing into the mold by creating 11-node meniscus shapes on the mold's inner surface. be.
本発明の目的は、鋳型内の溶融金属に電磁力を効率的に
作用させ、溶融金属の一次冷却領域における潤滑剤の供
給量（流入量、即ち、消費量）の制御性を向上させるこ
とにより、高速鋳造でも表面性状の良好な鋳片を安定し
て製造することができる連続鋳造装置および鋳造方法を
捉供することにある。An object of the present invention is to efficiently apply electromagnetic force to the molten metal in the mold and improve the controllability of the lubricant supply amount (inflow amount, i.e. consumption amount) in the primary cooling area of the molten metal. Another object of the present invention is to provide a continuous casting device and a casting method that can stably produce slabs with good surface properties even during high-speed casting.
（課題を解決するための手段）
本発明者は、上記課題を解決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。即ち、（ａ） 熱
伝導廣と電気伝導度が低くしかも高融点で密度が大きい
鉄などを高速鋳造して、安定して良好な鋳片を製造する
には、内部水冷構造でしがも一次冷却領域の長い鋳型構
造と潤滑方法が必要である。(Means for Solving the Problems) As a result of various studies on means for solving the above problems, the inventors have obtained the following knowledge. That is, (a) In order to produce stable and good slabs by high-speed casting of iron, etc., which has low thermal conductivity and low electrical conductivity, high melting point, and high density, an internal water cooling structure is necessary. A mold structure with a long cooling area and a lubrication method are required.
（ロ）その際、溶融金属と潤滑剤の界面形状を電磁力を
利用して１５Ｍ５すると、鋳型と鋳片の間隙に流入する
潤滑剤量を制御することができ、潤滑剤消費量の制御性
が向上する。その結果、表面性状の良好な鋳片を安定し
て製造することができる。(b) At that time, if the interface shape between the molten metal and the lubricant is adjusted to 15M5 using electromagnetic force, the amount of lubricant flowing into the gap between the mold and the slab can be controlled, making it possible to control the amount of lubricant consumed. will improve. As a result, slabs with good surface properties can be stably produced.
（Ｃ）シかし、前記第１図に示すような装置では、鋳型
内で磁場が減衰して溶融金属に到達しないので効果的で
ない。(C) However, the apparatus shown in FIG. 1 is not effective because the magnetic field is attenuated within the mold and does not reach the molten metal.
（ｄ） 鋳型の上部に鋳造方向に沿う複数のスリ・ン
トを設けその周囲に通電コイルを多重に巻く構造の場合
は、鋳型のスリット部分を介して誘導電流が鋳型の内面
に侵入し、溶融金属に効率よくピンチ力が作用して、メ
ニスカス部を大きく湾曲させることができる。さらに、
コイルに供給する高周波電流の実効値を変化させると、
溶融金属と潤滑剤との界面形状を調節することができる
。(d) In the case of a structure in which multiple slits are provided along the casting direction at the top of the mold and energized coils are wound multiple times around them, induced current enters the inner surface of the mold through the slits of the mold, causing melting. Pinch force acts efficiently on the metal, making it possible to greatly curve the meniscus. moreover,
By changing the effective value of the high-frequency current supplied to the coil,
The shape of the interface between the molten metal and the lubricant can be adjusted.
本発明は、上記知見に基づいてなされたものであり、そ
の要旨は次の（１）および（２）の連続鋳造装置と（３
）の鋳造方法にある。The present invention has been made based on the above findings, and its gist is the following continuous casting apparatus (1) and (2) and (3)
) in the casting method.
（１）液体金属を鋳型に供給する耐火物製浸漬ノズルと
、液体金属を凝固させる内部水冷構造の金属製冷却鋳型
と、この鋳型を周回して高周波を流を通す通電コイルを
備えた金属の連続鋳造装置であって、前記鋳型は、その
上部に鋳造方向に延びる複数のスリットにより分割され
た内部冷却可能な構造のセグメント部分を有し、前記通
電コイルはこのセグメント部分を周回して配置されてい
ることを特徴とする金属の連続鋳造装置。(1) A metal cooling mold equipped with a refractory immersion nozzle that supplies liquid metal to the mold, a metal cooling mold with an internal water-cooled structure that solidifies the liquid metal, and an energizing coil that circulates around this mold and passes high frequency waves through it. In the continuous casting apparatus, the mold has a segment portion divided by a plurality of slits extending in the casting direction in the upper part and has a structure capable of internal cooling, and the energized coil is arranged around the segment portion. Continuous metal casting equipment characterized by:
（２）鋳型のセグメント部分の最上端部に、内部冷却可
能な構造の平板状の金属製フランジが機械的に結合され
ており、このフランジの外周側は一体構造であり、内周
側は前記鋳型のスリットの延長線上にスリットが設けら
れており、該スリットの下側部分を周回するように通電
コイルが配置されていることを特徴とする上記（１）の
金属の連続鋳造装置。(2) A flat metal flange with an internal cooling structure is mechanically connected to the uppermost end of the segment part of the mold, and the outer circumferential side of this flange is an integral structure, and the inner circumferential side is The continuous metal casting apparatus according to (1) above, characterized in that a slit is provided on an extension of the slit of the mold, and an energizing coil is arranged so as to go around the lower part of the slit.
（３）上記（１）または（２）の鋳造装置を用いる鋳造
方法であって、鋳造速度の変動に応じて通電コイルに供
給する高周波ｉｔ流の実効値を制御することを特徴とす
る金属の連続鋳造方法。(3) A method for casting metal using the casting apparatus according to (1) or (2) above, characterized in that the effective value of the high-frequency IT current supplied to the energizing coil is controlled according to fluctuations in the casting speed. Continuous casting method.
（作用）
以下、本発明の連続鋳造装置および鋳造方法を図面を用
いて説明する。(Function) The continuous casting apparatus and casting method of the present invention will be described below with reference to the drawings.
第３図の（ａ）およびら）は、それぞれ本発明鋳造装置
の１７２垂直断面図および水平断面図である。3(a) and 3(a) are a 172 vertical cross-sectional view and a horizontal cross-sectional view, respectively, of the casting apparatus of the present invention.
図示のように、この鋳造装置では鋳型１の上部に内部水
冷構造で、かつ鋳造方向に沿うスリットＩＣにより分割
されたセグメント部分１ａが形成されており、その周囲
に通電コイル２が多重に巻かれている。鋳型１には、そ
の内部に浸漬した給湯ノズル３を介して溶融金属４が供
給される。As shown in the figure, in this casting apparatus, a segment part 1a is formed in the upper part of a mold 1 with an internal water cooling structure and divided by a slit IC along the casting direction, and a current-carrying coil 2 is wound multiple times around the segment part 1a. ing. Molten metal 4 is supplied to the mold 1 through a hot water supply nozzle 3 immersed therein.
溶融金属４０表面には粉体状の潤滑剤６が上方から供給
され、溶湯と接触する潤滑剤６の一部は溶融して液体状
となり、鋳型と凝固シェル５の間隙に流入し、やがて固
化して凝固潤滑剤６−１が形成される。なお図において
１ｂはセグメント部分１ａの冷却水入口、２ａは通電コ
イル２の冷却水入口である。A powdered lubricant 6 is supplied to the surface of the molten metal 40 from above, and a portion of the lubricant 6 that comes into contact with the molten metal melts into a liquid state, flows into the gap between the mold and the solidified shell 5, and eventually solidifies. A solidified lubricant 6-1 is formed. In the figure, 1b is the cooling water inlet of the segment portion 1a, and 2a is the cooling water inlet of the energized coil 2.
このような連続鋳造装置を使用して鋳造を行う場合、鋳
型を上下に微小振動（オツシレーション）させて潤滑剤
の流入を促進しつつ、給湯ノズルから連続的に溶湯を供
給して凝固鋳片を連続的に引き抜いて行く、このとき、
高周波磁場を用いない、または高周波磁場を用いたとし
ても、鋳造方向に沿うスリットが鋳型に配置されていな
い第４図に示すような構造の従来の鋳型による鋳造法の
場合は、第５図の（ａ）に詳しく示すように、潤滑剤・
溶融金属の界面と固化した潤滑剤のなす角θは比較的大
きく、おおむね８０°〜９０°である。When casting using such continuous casting equipment, the mold is slightly vibrated up and down (oscillation) to promote the inflow of lubricant, and the molten metal is continuously supplied from the hot water supply nozzle to solidify the slab. At this time, when the
In the case of a casting method using a conventional mold with a structure as shown in Fig. 4, in which a high-frequency magnetic field is not used, or even if a high-frequency magnetic field is used, slits along the casting direction are not arranged in the mold, the structure shown in Fig. 5 is as follows. As shown in detail in (a), lubricants and
The angle θ formed between the interface of the molten metal and the solidified lubricant is relatively large, and is approximately 80° to 90°.
一方、本発明の鋳造装置においてコイルに高周波電流を
供給した場合は、第３図（ａ）に示すようにピンチ力Ｆ
が溶湯の表面近傍に発生するため潤滑剤６と溶融金属４
の界面が大きく湾曲し、第５図（ロ）に示すとおり、角
θを小さくすることができる。On the other hand, when a high frequency current is supplied to the coil in the casting apparatus of the present invention, the pinch force F
is generated near the surface of the molten metal, so the lubricant 6 and the molten metal 4
The interface is greatly curved, and the angle θ can be made small as shown in FIG. 5(b).
即ち、本発明装置の場合は、潤滑剤・溶融金属の界面と
固化した潤滑剤との隙間が大きく、かつ深くなるので潤
滑剤の流入量を増やすことができるのである。That is, in the case of the apparatus of the present invention, the gap between the lubricant/molten metal interface and the solidified lubricant becomes larger and deeper, so that the amount of lubricant flowing can be increased.
さらに、通電コイルに供給する高周波電流の実効値を変
えることにより、鋳造速度、鋼種、潤滑剤の物性値に応
じて、潤滑剤が鋳片と鋳型の間隙に適正量流入できるよ
うに角θを調節することができる。特に鋳造装置のスタ
ートから定常鋳込状態に至る過程において、鋳造速度の
増加とともに潤滑剤の種類を変えて、その物性値の変化
により潤滑剤の流入量を変える従来の操業法と同じ効果
が、高周波電流に供給する電流を変えるという簡単かつ
敏速な操作で得られる。Furthermore, by changing the effective value of the high-frequency current supplied to the energizing coil, we can adjust the angle θ to allow the appropriate amount of lubricant to flow into the gap between the slab and the mold, depending on the casting speed, steel type, and physical properties of the lubricant. Can be adjusted. In particular, in the process from the start of the casting equipment to the steady state of pouring, the type of lubricant is changed as the casting speed increases, and the same effect as the conventional operation method is achieved by changing the inflow amount of lubricant due to changes in its physical properties. This can be achieved by simply and quickly changing the current supplied to the high-frequency current.
第６図に示すのは、本発明による別の連続鋳造装置で、
（ａ）は１／２縦断面図、わ）は同じく水平断面図であ
る。この装置では、鋳型の特に上部における熱膨張によ
る変形を防止するため、鋳型のセグメント部分の最上端
部に、内部冷却可能な構造の平板状の金属製フランジ１
ｄが機械的に結合されている。ｌｅは冷却水の供給口で
ある。このフランジの外周側は連続した一体構造であり
、内周側は前記鋳型のスリットの延長線上にスリットが
設けられており、該スリットの下側部分（垂直部分）を
周回するようにｉ１１！コイル２が配置されている。FIG. 6 shows another continuous casting apparatus according to the present invention,
(a) is a 1/2 vertical cross-sectional view, and (w) is a horizontal cross-sectional view. In this device, in order to prevent deformation due to thermal expansion, especially in the upper part of the mold, a flat metal flange 1 with an internal cooling structure is installed at the top end of the segment part of the mold.
d are mechanically connected. le is a cooling water supply port. The outer circumferential side of this flange is a continuous integral structure, and the inner circumferential side is provided with a slit on an extension of the slit in the mold, and i11! A coil 2 is arranged.
このような装置による鋳造操作も前記第３図の装置の場
合と同じである。The casting operation using such an apparatus is also the same as that for the apparatus shown in FIG.
第３図または第６図に例示する本発明装置において、ス
リットＩＣに湯差しが起きるおそれがある場合は、スリ
ット部分に耐火物等の絶縁物を充填すればよい、このよ
うにしても、機能上は何の障害もない。In the device of the present invention illustrated in FIG. 3 or FIG. 6, if there is a possibility that hot water may occur in the slit IC, the slit portion may be filled with an insulating material such as a refractory material. There are no obstacles above.
第３図および第６図に示した装置は、鋳型の水平断面が
長方形のものであるが、これは正方形、円形、その他の
形状であってもよいことは言うまでもない。In the devices shown in FIGS. 3 and 6, the horizontal cross section of the mold is rectangular, but it goes without saying that this may be square, circular, or other shapes.
以下、実施例により本発明の鋳造装置および鋳造方法を
さらに詳しく説明する。Hereinafter, the casting apparatus and casting method of the present invention will be explained in more detail with reference to Examples.
〔実施例１〕
第３図（ａｌおよび（ｂ）に示した本発明装置を用いて
、角断面の鋳片を製造した。鋳造装置の諸元および鋳造
条件は下記の逼りである。[Example 1] A slab with a square cross section was manufactured using the apparatus of the present invention shown in Figs. 3 (al and (b)).The specifications of the casting apparatus and casting conditions were as follows.
■ 鋳型：内寸法８０ｇ＋鵬×１５０１１ＩＩ、肉Ｉ３
０翔−１長さ１０００ｍ霞
■ スリット： Ｉ！０．１ｍｍ 、長さ１５０ｍ＋＊
、個数３２本■ 給湯ノズル：内径３０１ＩＩＩｌ
■ 通電コイル：外径２０ｍｍ、肉厚１醜−１巻き数４
■ 通電コイルに流れる電流の実効値： ２００００Ａ
■ 高周波１ｔｆＬの周波数： ２０Ｈｚ■ 鋼種 Ｃ
＝０．２％、Ｍｎ＝０．４％、Ｓｔ −０，３％、Ｐ＝
０．０２％、Ｓ＝０．０２％の炭素鋼■ 鋳片の大きさ
：８０ＩＩＩｌ×１５０１■ 鋳造速度： ２．２ｍ＋
／ｓｉｎ
［相］ ｔ＠綱湯温度 １５２０°Ｃ
■ 溶融パウダーのプール厚：】０−■＠ パウダーの
組成：下記第１表のとおり鋳造に際しては鋳型と通電コ
イルに常温の冷却水を供給しつつ、鋳型の下方から８０
ｍｍＸ１５０ｍ＋ｓ。■ Mold: Inner size 80g + Peng x 15011II, meat I3
0 Sho-1 Length 1000m Kasumi ■ Slit: I! 0.1mm, length 150m+*
, Number of pieces: 32 ■ Hot water nozzle: Inner diameter 301III ■ Current-carrying coil: Outer diameter 20 mm, wall thickness 1 - 1 number of turns 4
■ Effective value of current flowing through the energized coil: 20000A
■High frequency 1tfL frequency: 20Hz■ Steel type C
=0.2%, Mn=0.4%, St -0.3%, P=
0.02%, S=0.02% carbon steel■ Slab size: 80III1×1501■ Casting speed: 2.2m+
/sin [Phase] t@Road water temperature 1520°C ■ Molten powder pool thickness: ]0-■@ Powder composition: As shown in Table 1 below, during casting, cool water at room temperature is supplied to the mold and energized coil. 80mm from the bottom of the mold
mmX150m+s.
長さ７０ｍｍのダミーパーを供給ノズルの下端部まで挿
入した。そのあと溶鋼を給湯ノズルを介して鋳型内に給
湯して凝固シェルを形成させつつ２．２ｓ＋／ｗｉｎの
速度で４０秒間連続して引き抜いた。その際、鋳型近傍
における潤滑剤熔融パウダーと溶鋼の界面形状を観察す
るために磁気共鳴の緩和時間差を検出して画像処理を行
った結果、界面と固化した潤滑剤の成す角θは１０”〜
２０°になっていることが確認された。前述の如く、従
来法は角θが８０゜〜９０°であり、本発明の実施によ
り、潤滑剤の鋳型と鋳片との間隙への流入が促進される
ことがわかった。鋳造終了後、鋳片の表面および内部を
検査したところ、コールドシャットに起因する表面欠陥
は従来の５０に程度であり、偏析や割れなどの内部欠陥
もない品質の良好な鋳片であった。A dummy par with a length of 70 mm was inserted to the lower end of the supply nozzle. Thereafter, molten steel was fed into the mold through a hot water supply nozzle to form a solidified shell, and was continuously drawn out at a speed of 2.2 s+/win for 40 seconds. At that time, in order to observe the shape of the interface between the molten lubricant powder and molten steel near the mold, we detected the difference in magnetic resonance relaxation time and performed image processing. As a result, the angle θ between the interface and the solidified lubricant was 10"~
It was confirmed that the angle was 20°. As mentioned above, in the conventional method, the angle θ is 80° to 90°, and it has been found that the implementation of the present invention promotes the flow of the lubricant into the gap between the mold and the slab. After casting was completed, the surface and interior of the slab were inspected, and the surface defects caused by cold shutting were about 50 compared to conventional slabs, and the slab was of good quality with no internal defects such as segregation or cracks.
〔実施例２〕
第６図（ａｌおよび（ｂｌに示した装置（フランジＩｄ
の厚さは３０ｍｍ、スリットの輻および長さはそれぞれ
１ｍｍおよび１００＋ｇｖ＋ ）を使用して実施例１と
同し条件で鋳造した。熱膨張に起因する鋳型の変形は実
施例１の装置に比較して１１５に減少し、表面欠陥のほ
とんど認められない良好な鋳片が得られた。[Example 2] The device shown in Fig. 6 (al and (bl) (flange Id
Casting was carried out under the same conditions as in Example 1, with a thickness of 30 mm and a slit radius and length of 1 mm and 100+gv+, respectively. The deformation of the mold due to thermal expansion was reduced to 115 compared to the apparatus of Example 1, and a good slab with almost no surface defects was obtained.
［実施例３］ 実施例２と同し装置を用いて次の連続鋳造を実施した。[Example 3] The following continuous casting was carried out using the same equipment as in Example 2.
即ち、連続鋳造の立上り期において、１０秒間で鋳造速
度を２．２ｍ／ｓｉｎの所定速度まで高め、この間鋳造
速度に比例して通電コイルに供給する高周波電流実効値
をＯＡから２００００ Ａに増加した。That is, during the start-up period of continuous casting, the casting speed was increased to a predetermined speed of 2.2 m/sin for 10 seconds, and during this period, the effective value of the high-frequency current supplied to the energized coil was increased from OA to 20,000 A in proportion to the casting speed. .
その外の鋳造条件は実施例２と同じである。The other casting conditions were the same as in Example 2.
この場合、パウダーは鋳造開始から終了まで同一種類の
ものを使用したが、何らの欠陥もない鋳片が得られた。In this case, the same type of powder was used from the start to the end of casting, and slabs without any defects were obtained.
つまり、従来法のように、低速鋳込時には低速用パウダ
ーを、高速鋳込時には高速用パウダーを使用する潤滑剤
変更操作を行わなくても、本発明の実施により鋳造速度
に応じた適正量の潤滑剤消費が実現されており、その結
果、表面欠陥の全く存在しない鋳片が得られたのである
。In other words, without having to change the lubricant as in the conventional method, in which a low-speed powder is used for low-speed casting and a high-speed powder is used for high-speed casting, the present invention enables an appropriate amount of lubricant to be used according to the casting speed. Lubricant consumption was achieved, resulting in slabs completely free of surface defects.
（発明の効果）
上述のとおり、本発明の連続鋳造装置および鋳造方法に
よれば、通電コイルに流す高周波電流の実効価を変える
ことにより、鋳型と溶融金属の間隔に潤滑剤が流入する
角度を制御できるので、鋳造速度に応じて潤滑剤が適正
に供給され表面欠陥の少ない鋳片を安定して製造するこ
とができる。(Effects of the Invention) As described above, according to the continuous casting apparatus and casting method of the present invention, by changing the effective value of the high-frequency current flowing through the current-carrying coil, the angle at which the lubricant flows into the gap between the mold and the molten metal can be adjusted. Since it can be controlled, lubricant can be supplied appropriately according to the casting speed, and slabs with few surface defects can be stably manufactured.
この方法によれば、特殊なパウダーを使用しなくても高
速連続鋳造が可能になる。This method allows high-speed continuous casting without using special powder.
【図面の簡単な説明】
第１図は、潤滑剤を使用する従来のｔＭ１作用を利用し
た鋳造装置を示すＮ断面図である。
第２図は、潤滑剤を使用しない従来のｔ磁作用を利用し
た鋳造装置を示す縦断面図である。
第３図は、本発明の電磁作用を利用する鋳造装置の一例
を示す図で、（ａ）は１／２縦断面図、ｂ）は水平断面
図である。
第４図は、潤滑剤を使用して！磁作用を利用しない従来
の鋳造装置を示す１／２縦断面図である。
第５図（ａ）および働）は、それぞれ第３図および第４
図の一部を拡大した図である。
第６図は、内周側にスリットを設けた７ランジ導体を鋳
型最上端に機械的に結合した本発明の鋳造装置を示す図
で、（ａｌは１／２縦断面図、ら）は同じく水平断面図
である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an N cross-sectional view showing a conventional casting apparatus using tM1 action using a lubricant. FIG. 2 is a longitudinal cross-sectional view showing a conventional casting apparatus using t-magnetic action without using lubricant. FIG. 3 is a diagram showing an example of a casting apparatus that utilizes the electromagnetic effect of the present invention, in which (a) is a 1/2 vertical cross-sectional view, and (b) is a horizontal cross-sectional view. Figure 4 uses lubricant! FIG. 2 is a 1/2 vertical cross-sectional view showing a conventional casting device that does not utilize magnetic action. Figures 5(a) and 4) correspond to Figures 3 and 4, respectively.
It is an enlarged view of a part of the figure. Fig. 6 is a diagram showing a casting apparatus of the present invention in which a seven-lung conductor with slits provided on the inner circumferential side is mechanically connected to the uppermost end of the mold, (al is a 1/2 vertical cross-sectional view, and It is a horizontal sectional view.
Claims (3)
、液体金属を凝固させる内部水冷構造の金属製冷却鋳型
と、この鋳型を周回して高周波電流を通す通電コイルを
備えた金属の連続鋳造装置であって、前記鋳型は、その
上部に鋳造方向に延びる複数のスリットにより分割され
た内部冷却可能な構造のセグメント部分を有し、前記通
電コイルはこのセグメント部分を周回して配置されてい
ることを特徴とする金属の連続鋳造装置。(1) A metal continuum that includes a refractory immersion nozzle that supplies liquid metal to the mold, a metal cooling mold with an internal water-cooled structure that solidifies the liquid metal, and a current-carrying coil that circulates around this mold and passes a high-frequency current through it. In the casting apparatus, the mold has a segment portion divided by a plurality of slits extending in the casting direction in the upper part and has a structure capable of being internally cooled, and the energizing coil is disposed around the segment portion. Continuous metal casting equipment characterized by:
能な構造の平板状の金属製フランジが機械的に結合され
ており、このフランジの外周側は一体構造であり、内周
側は前記鋳型のスリットの延長線上にスリットが設けら
れており、該スリットの下側部分を周回するように通電
コイルが配置されていることを特徴とする請求項（１）
の金属の連続鋳造装置。(2) A flat metal flange with an internal cooling structure is mechanically connected to the uppermost end of the segment part of the mold, and the outer circumferential side of this flange is an integral structure, and the inner circumferential side is Claim (1) characterized in that a slit is provided on an extension line of the slit of the mold, and an energizing coil is arranged so as to go around the lower part of the slit.
Continuous metal casting equipment.
造方法であって、鋳造速度の変動に応じて高周波電流の
実効値を制御することを特徴とする金属の連続鋳造方法
。(3) A continuous metal casting method using the casting apparatus according to claim (1) or (2), characterized in that the effective value of the high-frequency current is controlled in accordance with fluctuations in casting speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2260829A JP2555768B2 (en) | 1990-09-29 | 1990-09-29 | Continuous metal casting apparatus and casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2260829A JP2555768B2 (en) | 1990-09-29 | 1990-09-29 | Continuous metal casting apparatus and casting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04138843A true JPH04138843A (en) | 1992-05-13 |
| JP2555768B2 JP2555768B2 (en) | 1996-11-20 |
Family
ID=17353339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2260829A Expired - Fee Related JP2555768B2 (en) | 1990-09-29 | 1990-09-29 | Continuous metal casting apparatus and casting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2555768B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0515949A (en) * | 1991-03-22 | 1993-01-26 | Sumitomo Metal Ind Ltd | Apparatus and method for continuously casting metal |
| JP2010207843A (en) * | 2009-03-09 | 2010-09-24 | Nippon Steel Corp | Continuous casting method of molten metal |
| WO2013137607A1 (en) * | 2012-03-13 | 2013-09-19 | 한국생산기술연구원 | Crucible for electromagnetic casting with slits formed at nonequal intervals |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02147150A (en) * | 1988-11-29 | 1990-06-06 | Kobe Steel Ltd | Mold for continuous casting |
-
1990
- 1990-09-29 JP JP2260829A patent/JP2555768B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02147150A (en) * | 1988-11-29 | 1990-06-06 | Kobe Steel Ltd | Mold for continuous casting |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0515949A (en) * | 1991-03-22 | 1993-01-26 | Sumitomo Metal Ind Ltd | Apparatus and method for continuously casting metal |
| JP2010207843A (en) * | 2009-03-09 | 2010-09-24 | Nippon Steel Corp | Continuous casting method of molten metal |
| WO2013137607A1 (en) * | 2012-03-13 | 2013-09-19 | 한국생산기술연구원 | Crucible for electromagnetic casting with slits formed at nonequal intervals |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2555768B2 (en) | 1996-11-20 |
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