JP3393712B2 - Continuous casting method of molten metal - Google Patents
Continuous casting method of molten metalInfo
- Publication number
- JP3393712B2 JP3393712B2 JP22637494A JP22637494A JP3393712B2 JP 3393712 B2 JP3393712 B2 JP 3393712B2 JP 22637494 A JP22637494 A JP 22637494A JP 22637494 A JP22637494 A JP 22637494A JP 3393712 B2 JP3393712 B2 JP 3393712B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- molten metal
- slab
- continuous casting
- water
- 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.)
- Expired - Lifetime
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Description
【０００１】[0001]
【産業上の利用分野】本発明は、溶融金属の連続鋳造方
法に関する。FIELD OF THE INVENTION The present invention relates to a continuous casting method for molten metal.
【０００２】[0002]
【従来の技術】冷却した鋳型内に溶融金属を注入し、こ
れを連続鋳造して鋳片を得る際に、溶融金属は鋳型壁か
ら凝固を開始する。その際溶融金属の自由表面には酸化
物などの不純物が存在する。この不純物が鋳造引き抜き
と共に鋳片表面に捕捉され、鋳片の表面欠陥を形成す
る。これを防止する技術として、例えば、Ａｌの連続鋳
造に用いられるホットトップ鋳造法がある。この鋳造法
は、鋳型上部を断熱状態に近い条件にして、凝固開始点
を自由表面より下方に移動させ、不純物の鋳造鋳片への
捕捉を防止するものである。また、耐火物ないしは鋳型
上部に加熱コイルを設け、溶融金属を溶融保持して同様
の効果を得る事もできる。2. Description of the Related Art When molten metal is poured into a cooled mold and continuously cast to obtain a slab, the molten metal begins to solidify from the mold wall. At that time, impurities such as oxides exist on the free surface of the molten metal. The impurities are trapped on the surface of the slab together with the casting drawing, and form surface defects of the slab. As a technique for preventing this, for example, there is a hot top casting method used for continuous casting of Al. In this casting method, the upper part of the mold is set to a condition close to an adiabatic state, and the solidification start point is moved below the free surface to prevent impurities from being trapped in the cast slab. A heating coil may be provided on the refractory or the upper part of the mold to melt and hold the molten metal to obtain the same effect.
【０００３】特開平２−３７９４３号公報には、このよ
うな方法の例が記載されている。しかし、断熱状態に保
つには、耐火物を用いる必要があるため、耐火物寿命の
問題や、耐火物による溶湯の汚染、さらには、溶融金属
を凝固させるために耐火物の下側に設置された鋳型にお
いて、鋳片と鋳型との間の潤滑が不足し、鋳造引抜速度
の増加が図れない、あるいは、耐火物と鋳型の接続部が
存在するために、鋳造鋳片の表面にくぼみ等の欠陥が発
生する等種々の問題があった。これらの問題に対して
は、凝固前面に連続的に電磁力を印加して、凝固部での
鋳型への押しつけによる摩擦力の発生、鋳型への焼き付
きなどを防止する方法が考えられる。例えば、特開平１
−２８４４６９号公報には、耐火物と鋳型の接続部に電
磁力を連続的に作用させ、鋳造鋳片の表面に生成する前
記欠陥を防止する方法が述べられている。An example of such a method is described in Japanese Patent Laid-Open No. 2-37943. However, since it is necessary to use refractory to keep it in an adiabatic state, there is a problem of refractory life, contamination of molten metal by refractory, and further installation under refractory to solidify molten metal. In the mold, the lubrication between the slab and the mold is insufficient, it is not possible to increase the casting drawing speed, or because there is a connection between the refractory and the mold, such as dents on the surface of the cast slab There were various problems such as defects. To solve these problems, a method of continuously applying an electromagnetic force to the front surface of the solidification to prevent generation of frictional force due to pressing against the mold at the solidification portion, seizure to the mold, and the like can be considered. For example, JP-A-1
JP-A-284469 describes a method of continuously applying an electromagnetic force to a connecting portion between a refractory material and a mold to prevent the above-mentioned defects generated on the surface of a cast slab.
【０００４】[0004]
【発明が解決しようとする課題】前記のように耐火物を
用いる方法によれば、従来に比して清浄度に優れた鋳片
を製造する事ができる。さらに、凝固前面に電磁力を付
与することにより、耐火物と鋳型の接続に起因する欠陥
の生成を改善し、あるいは鋳型と鋳造鋳片間の摩擦抵抗
を減少させて生産性の向上が図れる。しかしながら、耐
火物の利用では、耐火物自身による溶融金属の汚染や、
耐火物と鋳型の接続部に起因した鋳片表面における欠陥
の生成の問題がある。このため、電磁力を付与して凝固
前面での溶融金属の非接触保持を図り、欠陥の生成を改
善することができる。しかし、連続して電流を電磁コイ
ルに印加し、鋳片と鋳型の間の摩擦抵抗を減少させる方
法は、本発明者らが実験したところによると、溶融金属
内に生成する非定常な流動や、溶融金属の注入流の影響
により、鋳型から鋳片を引き抜く際の溶融金属の表面に
ふらつきが生じ、鋳型との接触が周方向に安定しない結
果、鋳片の表面性状を改善しようとしても鋳片周方向に
安定したものとはならなかった。According to the method of using a refractory material as described above, it is possible to manufacture a slab having a higher cleanliness than the conventional one. Further, by applying an electromagnetic force to the solidification front surface, the production of defects due to the connection between the refractory and the mold can be improved, or the frictional resistance between the mold and the cast slab can be reduced to improve the productivity. However, when refractory is used, contamination of molten metal by the refractory itself,
There is a problem of generation of defects on the surface of the slab due to the connection between the refractory and the mold. Therefore, electromagnetic force can be applied to hold the molten metal on the front surface of solidification in a non-contact manner, and the generation of defects can be improved. However, according to the experiments conducted by the present inventors, a method of continuously applying a current to the electromagnetic coil to reduce the frictional resistance between the cast slab and the mold is unsteady flow or , Due to the influence of the injection flow of the molten metal, the surface of the molten metal is wobbled when the slab is pulled out of the mold, and the contact with the mold is not stable in the circumferential direction. It was not stable in one direction.
【０００５】[0005]
【課題を解決するための手段】本発明では、溶融金属を
保持する容器をアルミナ等の耐火物の断熱材で構成する
代りに、水冷機構を有し、互いに電気的に絶縁された複
数の導電性セグメントが、上下に開口した筒を形成する
ように、その周方向に沿って配列されて水冷容器を形成
し、その外側に、正弦波状交流電流を流すための誘導コ
イルが前記導電性セグメントと同軸に配置されて電磁場
誘導装置を形成する装置を用いる。According to the present invention, instead of forming a container for holding a molten metal with a heat insulating material of a refractory material such as alumina, a plurality of electrically conductive members electrically insulated from each other have a water cooling mechanism. The conductive segment is arranged along the circumferential direction to form a water-cooled container so as to form a cylinder that is opened vertically, and an induction coil for flowing a sinusoidal alternating current is formed on the outer side of the water-cooled container and the conductive segment. A device is used that is arranged coaxially to form an electromagnetic field induction device.
【０００６】まず、導電性セグメントにより形成されて
いる水冷容器内で溶融金属を誘導加熱しながらこれを溶
融保持し、その後、この溶融金属を水冷容器の下側に接
続された鋳型を用いて凝固させ、得られた鋳片を連続的
に引き抜く。本発明による溶融金属の連続鋳造方法は、
その際に、鋳型外周を取り囲むように配置された電磁コ
イルによって、鋳型内の溶融金属に電磁力を与え、凝固
シェルと鋳型との間の摩擦抵抗を減少させることにより
潤滑性を向上させて行なうものである。First, a molten metal is induction-heated in a water-cooled container formed of conductive segments while it is melted and held, and then the molten metal is solidified by using a mold connected to the lower side of the water-cooled container. Then, the obtained cast piece is continuously pulled out. The continuous casting method of the molten metal according to the present invention,
At that time, an electromagnetic coil is arranged so as to surround the outer periphery of the mold to apply an electromagnetic force to the molten metal in the mold to reduce frictional resistance between the solidified shell and the mold to improve lubricity. It is a thing.
【０００７】このとき、鋳型外周の電磁コイルに印加す
る交流電流には、その振幅に周期的にステップ状の強弱
を付加する。あるいはまた、鋳型外周の電磁コイルに付
与する交流電流を、振幅変調、周波数変調、位相変調の
いずれかで変調した電流としても同等の効果を得ること
ができる。At this time, the alternating current applied to the electromagnetic coil on the outer periphery of the mold is periodically added with a stepwise strength or weakness in its amplitude. Alternatively, the same effect can be obtained even if the alternating current applied to the electromagnetic coil on the outer periphery of the mold is modulated by any of amplitude modulation, frequency modulation and phase modulation.
【０００８】このとき、連続的に引き抜かれる鋳片及び
その直上にある溶融金属が鋳型から引き離される際の安
定性を保持するためには、交流電流の振幅に付加される
ステップ状の強弱の周期を０．５Hz以上５Hz以下にする
事が望ましい。この点については、電流を変調する場合
にも同様である。また、ステップ状の強弱を付加する場
合、その周期内で強い磁場を印加する時間の比率を全体
の１０％以上５０％以下とすることが望ましい。ここ
で、この時間の比率の下限は間欠的な電磁力の印加によ
る効果を発現する上で、最低必要とする時間であり、ま
た、上限は鋳型から引き離された溶融金属の安定性を保
持する上で必要な条件として決まるものである。At this time, in order to maintain the stability when the continuously drawn slab and the molten metal immediately above the slab are separated from the mold, a step-like strong and weak cycle added to the amplitude of the alternating current is maintained. It is desirable that the frequency is 0.5 Hz or more and 5 Hz or less. The same applies to the case where the current is modulated. Further, when stepwise strength is added, it is desirable that the ratio of the time for applying a strong magnetic field within the cycle is 10% or more and 50% or less of the whole. Here, the lower limit of the ratio of this time is the minimum required time for expressing the effect by the intermittent application of electromagnetic force, and the upper limit maintains the stability of the molten metal separated from the mold. It is decided as a necessary condition above.
【０００９】さらに、鋳型を用いて溶融金属を凝固さ
せ、得られた鋳片を引き抜く際に、鋳片を、連続的では
なく、間欠的に引き抜くことでも同等の効果が得られ
る。この場合には、鋳型外周の電磁コイルに印加する交
流電流の振幅に付加する周期的なステップ状の強弱の繰
り返しの周波数ｆt を、鋳片を間欠的に引き抜く際の周
波数ｆm と同じに設定する、あるいは、鋳型外周の電磁
コイルに付与する変調電流の信号波の周波数ｆs を、鋳
片を間欠的に引き抜く際の周波数ｆm と同じに設定す
る。Further, when the molten metal is solidified by using a mold and the obtained slab is pulled out, the same effect can be obtained by intermittently withdrawing the slab, not continuously. In this case, the frequency ft of periodic step-like strength addition to the amplitude of the alternating current applied to the electromagnetic coil on the outer periphery of the mold is set to be the same as the frequency fm when the slab is intermittently pulled out. Alternatively, the frequency fs of the signal wave of the modulation current applied to the electromagnetic coil on the outer periphery of the mold is set to be the same as the frequency fm when the slab is intermittently pulled out.
【００１０】なお、前記容器外周の誘導コイルに与える
正弦波状交流電流の周波数は、５００Hz以上１００kHz
以下とするのが良い。この上限及び下限は、溶融金属に
対する加熱効率及び溶融金属の安定性保持から決まって
くるものである。The frequency of the sinusoidal alternating current applied to the induction coil on the outer circumference of the container is 500 Hz or more and 100 kHz.
The following is good. The upper and lower limits are determined by the heating efficiency for molten metal and the stability of molten metal.
【００１１】また、本発明において水冷容器を形成する
セグメントの数は、２〜数１０個程度である。各セグメ
ントは銅などの導電性材料で中空に作られて、内部を貫
流する冷却水により冷却される。この導電性セグメント
により形成される容器は、上開きの形でその水平断面積
が下方に向かって連続的に減少するように工夫されてお
り、溶融金属を注湯する容器の上部では注入が容易な構
造になっている。例えば、振動鋳型による鋼の連続鋳造
法では、注湯する上での寸法の限界から製造が難しいと
される肉厚５０mm以下の薄肉鋳片の場合でも、本発明の
方法によれば、前記した導電性セグメントによる容器の
下端の内寸５０mmに対して上部を連続的に拡大し、注湯
部において１５０mmから２００mm程度の内寸を与えるこ
とが可能となり、製造が可能となる。In the present invention, the number of segments forming the water-cooled container is about 2 to several tens. Each segment is made hollow from a conductive material such as copper and is cooled by cooling water flowing through the inside. The container formed by this conductive segment is designed so that its horizontal cross-sectional area decreases continuously downwards in the form of an upper opening, and injection is easy at the top of the container where molten metal is poured. It has a simple structure. For example, according to the method of the present invention, even in the case of a thin cast piece having a wall thickness of 50 mm or less, which is considered to be difficult to manufacture in the continuous casting method of steel by a vibration mold due to the limit of the size when pouring, The conductive segment allows the upper portion to be continuously enlarged with respect to the inner diameter of 50 mm at the lower end of the container, and the inner diameter of about 150 mm to 200 mm can be given in the pouring portion, which enables manufacture.
【００１２】[0012]
【作用】溶融金属を溶融保持する容器と、その容器の下
側に連続して接続されて、溶融金属を凝固させるための
鋳型とを用いて鋳造を行った場合、鋳片表面には周期的
な欠陥が現れたり、あるいは鋳型と鋳片の焼き付きによ
る欠陥が発生する。[Operation] When casting is performed by using a container for melting and holding the molten metal and a mold for continuously solidifying the molten metal under the container and for solidifying the molten metal, the surface of the slab has a periodic pattern. Defects appear, or defects occur due to seizure between the mold and the slab.
【００１３】これに対し、鋳型の回りに鋳型と同軸で配
置した電磁コイルにステップ状の強弱を付加した交流電
流を印加し、鋳型内の凝固前面の溶融金属並びに凝固シ
ェルに間欠的に電磁力を作用させると、図２のような電
磁力が発生し、図３に示すように、初期凝固部において
鋳型と鋳片の接触圧が間欠的に低減される結果、前記し
たような欠陥が改善される。On the other hand, by applying an alternating current with stepwise strength added to an electromagnetic coil arranged coaxially with the mold around the mold, electromagnetic force is intermittently applied to the molten metal on the solidification front and the solidified shell in the mold. 2 causes electromagnetic force as shown in FIG. 2, and as shown in FIG. 3, the contact pressure between the mold and the slab is intermittently reduced at the initial solidification part, resulting in improvement of the above defects. To be done.
【００１４】さらに、鋳片の引き抜きを、凝固が逐次発
生するように、例えば図４のように、間欠的に行うこと
により凝固を安定させる事ができる。ただし、電磁力を
印加したりせずにそのまま行なった場合には間欠的に凝
固が進行するため、それが表面欠陥となって表われる。
そこで、前記のステップ状の印加を実施し、特に、間欠
引き抜きにおける最大引き抜き速度の時点前後で電磁力
を印加する。これによって鋳片が安定して鋳型中心に向
かって絞りこまれるようになり、鋳型と鋳片の間隙が確
保されて、鋳型と鋳片の間の抵抗が小さくなると共に、
凝固シェルに作用する剪断力が減少するため破断が防止
される。Further, the solidification can be stabilized by intermittently extracting the slab so that solidification successively occurs, for example, as shown in FIG. However, when the electromagnetic force is applied as it is without being applied, solidification progresses intermittently, which appears as a surface defect.
Therefore, the stepwise application is performed, and in particular, the electromagnetic force is applied before and after the time of the maximum drawing speed in the intermittent drawing. With this, the slab can be stably squeezed toward the center of the mold, a gap between the mold and the slab is secured, and the resistance between the mold and the slab is reduced,
Fracture is prevented because the shearing forces acting on the solidified shell are reduced.
【００１５】このような間欠的な電磁力を発生させるコ
イル電流は、ステップ状交流電流に限定されるものでは
ない。振幅変調や周波数変調、位相変調等の変調された
電流に依っても実現できる。この場合、変調電流の信号
波の周波数ｆs がステップ状交流における電流振幅の強
弱の繰り返し周波数ｆt に相当し、搬送波の周波数ｆc
が交流電流の周波数ｆp に相当するため、信号波の周波
数ｆs を間欠引き抜きの振動数ｆm と同じに設定するこ
とで、上述のステップ状交流電流を印加した場合と同じ
作用を得る事ができる。なお、ここで言う、ステップ状
印加とは一般に図５（ｂ）に示すようなモードであり、
図５（ａ）に示すようなオンオフを繰り返すパルス状印
加を含むものである。The coil current for generating such an intermittent electromagnetic force is not limited to the stepwise alternating current. It can also be realized by using a modulated current such as amplitude modulation, frequency modulation or phase modulation. In this case, the frequency fs of the signal wave of the modulation current corresponds to the repetition frequency ft of the strength and weakness of the current amplitude in the stepwise alternating current, and the frequency fc of the carrier wave.
Corresponds to the frequency fp of the alternating current. Therefore, by setting the frequency fs of the signal wave to be the same as the frequency fm of the intermittent extraction, the same action as when the stepwise alternating current is applied can be obtained. The stepwise application referred to here is generally a mode as shown in FIG.
This includes pulsed application in which ON / OFF is repeated as shown in FIG.
【００１６】次に、上部容器に関し、水冷機構を有し、
互いに電気的に絶縁された複数の導電性セグメントが、
上下に開口した筒を形成するように、その周方向に沿っ
て配列して成る水冷容器と、その容器の外側に、正弦波
状交流電流を流すための誘導コイルが前記導電性セグメ
ントによる容器と同軸に配置されて成る電磁場誘導装置
については、誘導コイルに交流電流を供給すると、容器
内溶融金属は、容器内に閉じこめられるような力（ピン
チ力）を受ける。印加した電磁場は、高周波電磁場であ
る。これがスリットを設け、セグメント化した水冷容器
の各々のセグメントを周回する電流ループを作ることに
より容器内部を浸透し、溶融金属を浮揚させるように作
用する。それと共に、ジュール熱が発生するため、溶融
金属は水冷容器と接触しても薄い凝固スカルを生成する
のみで、内部の溶融金属の大部分は溶融状態に保持され
る。この薄い凝固スカルは、鋳造には概ね問題ない。た
とえ凝固スカルがその生成条件にうまく合致して生成し
たとしても、容器下部で間欠的に電磁力が作用するた
め、鋳型内で生成する凝固シェルとつながる結果、鋳造
に支障をきたす恐れもない。Next, the upper container has a water cooling mechanism,
A plurality of electrically conductive segments electrically isolated from each other,
A water-cooled container arranged along the circumferential direction so as to form a cylinder opened vertically, and an induction coil for flowing a sinusoidal alternating current on the outside of the container is coaxial with the container formed by the conductive segment. With respect to the electromagnetic field induction device configured as described above, when an alternating current is supplied to the induction coil, the molten metal in the container receives a force (pinch force) such that the molten metal is confined in the container. The applied electromagnetic field is a high frequency electromagnetic field. This provides a slit to create a current loop around each segment of the segmented water cooled vessel to penetrate the vessel interior and act to levitate the molten metal. At the same time, Joule heat is generated, so that even if the molten metal comes into contact with the water-cooled container, only a thin solidified skull is generated, and most of the molten metal inside is held in a molten state. This thin solidified skull is generally fine for casting. Even if the solidified skull is produced in a manner that meets the production conditions well, the electromagnetic force acts intermittently in the lower portion of the container, and as a result, it is connected to the solidified shell produced in the mold, so that there is no risk of impeding casting.
【００１７】[0017]
【実施例】図１に示す装置を用いて、普通鋼の丸ビレッ
トの鋳造を行った。装置の代表寸法は、注入ノズル１の
直径５０mm、上部の導電性セグメント容器２の上端内径
３５０mm、下端内径１５０mm、肉厚３０mm、高さ２５０
mm、セグメント容器用誘導コイル３の上端内径４３０m
m、下端内径２３０mm、下端外径２７０mm、高さ１５０m
mで７ターンとした。この誘導コイル３には２０kHzの正
弦波高周波で２００kWの電力を印加した。また、鋳型４
は銅チューブとステンレスチューブを同軸に配置して、
その間隙に冷却水を流す構造とし、鋼板厚７mm、ステン
レス板厚１０mmで直径１５０mm、高さ６００mmとした。
さらに、ステップ状電流あるいは変調電流を与える電磁
コイル５は、内径２３０mm、外径５３０mm、高さ１５０
mmで４９ターンとした。この電磁コイルには、周波数３
kHzの搬送波に、６０Hzの信号波を付与した変調電流を
印加した。コイル印加電力は３００kWとした。EXAMPLE A round billet of ordinary steel was cast using the apparatus shown in FIG. The typical dimensions of the device are as follows: the diameter of the injection nozzle 1 is 50 mm, the inner diameter of the upper conductive segment container 2 is 350 mm, the lower diameter is 150 mm, the wall thickness is 30 mm, and the height is 250.
mm, upper end inner diameter of induction coil 3 for segment vessel 430 m
m, bottom inner diameter 230mm, bottom outer diameter 270mm, height 150m
I made 7 turns in m. Electric power of 200 kW was applied to the induction coil 3 at a sine wave high frequency of 20 kHz. Also, mold 4
Arranges the copper tube and the stainless tube coaxially,
The cooling water was made to flow through the gap, and the thickness of the steel plate was 7 mm, the thickness of the stainless steel plate was 10 mm, the diameter was 150 mm, and the height was 600 mm.
Further, the electromagnetic coil 5 which gives a step current or a modulation current has an inner diameter of 230 mm, an outer diameter of 530 mm, and a height of 150.
I made 49 turns in mm. This electromagnetic coil has a frequency of 3
A modulation current with a signal wave of 60 Hz was applied to a carrier wave of k Hz. The power applied to the coil was 300 kW.
【００１８】以上のような装置により、鋳造速度１００
cm／分の速度で鋳造を行い、良好な鋳片を得た。この時
の鋳片表面の欠陥の深さは、電磁コイルにより電磁力を
印加しない時に１０００μｍ程度であったものが、電磁
力印加により３００μｍ程度まで改善された。さらに、
鋳片を周波数３Hz、１周期内で５０％が静止状態、５０
％が前記速度の倍速で引き抜きを行った場合、電磁力を
印加しないときには、５００μｍ程度の深さの欠陥が存
在した。しかし、電磁力を印加することにより１００μ
ｍ以下の深さの欠陥が存在する程度まで改善され、本発
明が鋳片の表面性状改善に非常に有効とわかった。な
お、鋳造後セグメント容器の内部を確認したところ、セ
グメントの上部より１５０mmから２５０mmの部分に凝固
スカル６が観察された。しかし鋳型と上部容器との繋ぎ
目にはなんら残留物は認められず、上部容器に認められ
たスカルと鋳型内の凝固シェルが鋳造中に分離された状
態にあったことが確認された。A casting speed of 100 is obtained by the above apparatus.
Casting was performed at a speed of cm / min to obtain a good slab. At this time, the depth of defects on the surface of the slab was about 1000 μm when no electromagnetic force was applied by the electromagnetic coil, but was improved to about 300 μm by the application of electromagnetic force. further,
The slab has a frequency of 3 Hz, 50% is stationary within one cycle, 50
%, When the extraction was performed at a speed double the above speed, there was a defect with a depth of about 500 μm when no electromagnetic force was applied. However, it is 100μ when the electromagnetic force is applied.
It was improved to the extent that defects with a depth of m or less were present, and the present invention was found to be very effective in improving the surface quality of the slab. When the inside of the segment container was checked after casting, solidified skull 6 was observed in a portion 150 mm to 250 mm from the upper portion of the segment. However, no residue was found at the joint between the mold and the upper container, confirming that the skull found in the upper container and the solidified shell in the mold were separated during casting.
【００１９】[0019]
【発明の効果】以上説明してきたように、本発明の方法
を用いれば、従来の鋳型構造の鋳造では得られなかっ
た、良好な表面性状の鋳片を多種の金属に対して製造す
ることが可能となる。As described above, by using the method of the present invention, it is possible to produce a slab of good surface quality for various metals, which cannot be obtained by the conventional casting of the mold structure. It will be possible.
【図１】本発明の方法の概念図。FIG. 1 is a conceptual diagram of the method of the present invention.
【図２】ステップ状の電磁力の発生図。FIG. 2 is a generation diagram of a step-like electromagnetic force.
【図３】ステップ状の電磁力印加時の溶融金属及び凝固
シェルの変形を示す図。FIG. 3 is a diagram showing deformation of a molten metal and a solidified shell when a step-like electromagnetic force is applied.
【図４】間欠引き抜きのパターンを示す図。FIG. 4 is a view showing an intermittent drawing pattern.
【図５】コイルに印加する電流の波形を示す図。FIG. 5 is a diagram showing a waveform of a current applied to a coil.
１ 注入ノズル ２ 導電性セグメント容器 ３ 誘導加熱コイル ４ 鋳型 ５ 間欠電磁力印加コイル ６ 凝固スカル ７ 凝固シェル ８ 溶融金属 1 injection nozzle 2 Conductive segment container 3 induction heating coil 4 molds 5 Intermittent electromagnetic force application coil 6 solidification skull 7 solidification shell 8 Molten metal
───────────────────────────────────────────────────── フロントページの続き (72)発明者 浅井 滋生 愛知県名古屋市緑区鳴海町薬師山112番 地 (72)発明者 佐々 健介 愛知県愛知郡長久手町大字長湫字丁子田 15−43 (56)参考文献 特開 平２−37943（ＪＰ，Ａ) 特開 平３−294057（ＪＰ，Ａ) 特開 昭64−83348（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B22D 11/04 311 B22D 11/07 B22D 11/115 B22D 11/16 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigeo Asai 112 Yakushiyama, Narumi-cho, Midori-ku, Aichi Prefecture Nagoya City (72) Inventor Kensuke Sasa, Nagakute-cho, Aichi-gun, Aichi 15-43 (56) ) Reference JP-A-2-37943 (JP, A) JP-A-3-294057 (JP, A) JP-A 64-83348 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB) Name) B22D 11/04 311 B22D 11/07 B22D 11/115 B22D 11/16
Claims (5)
れた複数の導電性セグメントが、上下に開口した筒を形
成するように、その周方向に沿って配列されて水冷容器
を形成し、その外側に、正弦波状交流電流を流すための
誘導コイルが前記導電性セグメントと同軸に配置されて
電磁場誘導装置を形成する装置を用い、導電性セグメン
トにより形成されている水冷容器内で溶融金属を誘導加
熱しながらこれを溶融保持し、その後、この溶融金属を
水冷容器の下側に接続された鋳型を用いて凝固させ、得
られた鋳片を連続的に引き抜くに当たり、鋳型外周を取
り囲むように配置された電磁コイルによって、鋳型内の
溶融金属に電磁力を与え、凝固シェルと鋳型との間の摩
擦抵抗を減少させて溶融金属の連続鋳造を行なう方法で
あって、鋳型外周の電磁コイルに印加する交流電流の振
幅に周期的にステップ状の強弱を付加することを特徴と
する溶融金属の連続鋳造方法。1. A water-cooled container having a water-cooling mechanism, wherein a plurality of electrically-conductive segments electrically insulated from each other are arranged along the circumferential direction so as to form a cylinder that is open vertically. , The outside of which, an induction coil for flowing a sinusoidal alternating current is arranged coaxially with the conductive segment to form an electromagnetic field induction device, and a molten metal is formed in the water-cooled container formed by the conductive segment. It is melted and held while inductively heating it, then this molten metal is solidified using a mold connected to the lower side of the water cooling container, and when continuously extracting the obtained slab, surround the outer periphery of the mold. A method for performing continuous casting of molten metal by applying an electromagnetic force to the molten metal in the mold by an electromagnetic coil arranged in the mold to reduce frictional resistance between the solidified shell and the mold. A continuous casting method for molten metal, characterized in that stepwise strength is periodically added to the amplitude of an alternating current applied to an electromagnetic coil.
れた鋳片を引き抜く際に、（１）鋳片を、連続的ではな
く、間欠的に引き抜くこと、（２）鋳型外周の電磁コイ
ルに印加する交流電流の振幅に付加する周期的なステッ
プ状の強弱の繰り返しの周波数ｆt を、鋳片を間欠的に
引き抜く際の周波数ｆm と同じに設定すること、の２点
を特徴とする請求項１記載の溶融金属の連続鋳造方法。2. When the molten metal is solidified by using a mold and the obtained slab is drawn, (1) the slab is intermittently withdrawn, not continuously, (2) electromagnetic waves around the outer periphery of the mold. It is characterized in that the frequency ft of periodical step-like strength addition to the amplitude of the alternating current applied to the coil is set to be the same as the frequency fm when the slab is intermittently pulled out. The continuous casting method for molten metal according to claim 1.
れた複数の導電性セグメントが、上下に開口した筒を形
成するように、その周方向に沿って配列されて水冷容器
を形成し、その外側に、正弦波状交流電流を流すための
誘導コイルが前記導電性セグメントと同軸に配置されて
電磁場誘導装置を形成する装置を用い、導電性セグメン
トにより形成されている水冷容器内で溶融金属を誘導加
熱しながらこれを溶融保持し、その後、この溶融金属を
水冷容器の下側に接続された鋳型を用いて凝固させ、得
られた鋳片を連続的に引き抜くに当たり、鋳型外周を取
り囲むように配置された電磁コイルによって、鋳型内の
溶融金属に電磁力を与え、凝固シェルと鋳型との間の摩
擦抵抗を減少させて溶融金属の連続鋳造を行なう方法で
あって、鋳型外周の電磁コイルに振幅変調、周波数変
調、位相変調のいずれかで変調した交流電流を付与する
ことを特徴とする溶融金属の連続鋳造方法。3. A water-cooled container having a water-cooling mechanism, wherein a plurality of electrically-conductive segments electrically insulated from each other are arranged along the circumferential direction so as to form a cylinder that opens vertically. , The outside of which, an induction coil for flowing a sinusoidal alternating current is arranged coaxially with the conductive segment to form an electromagnetic field induction device, and a molten metal is formed in the water-cooled container formed by the conductive segment. It is melted and held while inductively heating it, then this molten metal is solidified using a mold connected to the lower side of the water cooling container, and when continuously extracting the obtained slab, surround the outer periphery of the mold. A method for performing continuous casting of molten metal by applying an electromagnetic force to the molten metal in the mold by an electromagnetic coil arranged in the mold to reduce frictional resistance between the solidified shell and the mold. A continuous casting method for molten metal, characterized in that an alternating current modulated by any of amplitude modulation, frequency modulation and phase modulation is applied to an electromagnetic coil.
れた鋳片を引き抜く際に、（１）鋳片を、連続的ではな
く、間欠的に引き抜くこと、（２）鋳型外周の電磁コイ
ルに付与する変調電流の信号波の周波数ｆs を、鋳片を
間欠的に引き抜く際の周波数ｆm と同じに設定するこ
と、の２点を特徴とする請求項３記載の溶融金属の連続
鋳造方法。4. When a molten metal is solidified using a mold and the obtained slab is drawn, (1) the slab is intermittently withdrawn, not continuously, (2) electromagnetic waves around the outer periphery of the mold. 4. The continuous casting method for molten metal according to claim 3, wherein the frequency fs of the signal wave of the modulation current applied to the coil is set to be the same as the frequency fm when the slab is intermittently pulled out. .
波数を、５００Hz以上１００kHz以下とすることを特徴
とする請求項１〜４のいずれかに記載の溶融金属の連続
鋳造方法。5. The frequency of the sinusoidal alternating current supplied to the induction coil, the continuous casting method of melting metal according to any one of claims 1 to 4, characterized in that a 100 k Hz and not more than 500 Hz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22637494A JP3393712B2 (en) | 1994-09-21 | 1994-09-21 | Continuous casting method of molten metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22637494A JP3393712B2 (en) | 1994-09-21 | 1994-09-21 | Continuous casting method of molten metal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0890183A JPH0890183A (en) | 1996-04-09 |
| JP3393712B2 true JP3393712B2 (en) | 2003-04-07 |
Family
ID=16844136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22637494A Expired - Lifetime JP3393712B2 (en) | 1994-09-21 | 1994-09-21 | Continuous casting method of molten metal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3393712B2 (en) |
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|---|---|---|---|---|
| CN111496205B (en) * | 2020-04-07 | 2021-08-24 | 江苏华企铝业科技股份有限公司 | Suspension over-and-under type agitating unit for aluminum ingot production |
-
1994
- 1994-09-21 JP JP22637494A patent/JP3393712B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0890183A (en) | 1996-04-09 |
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