JPH0130584B2 - - Google Patents
Info
- Publication number
- JPH0130584B2 JPH0130584B2 JP57196249A JP19624982A JPH0130584B2 JP H0130584 B2 JPH0130584 B2 JP H0130584B2 JP 57196249 A JP57196249 A JP 57196249A JP 19624982 A JP19624982 A JP 19624982A JP H0130584 B2 JPH0130584 B2 JP H0130584B2
- Authority
- JP
- Japan
- Prior art keywords
- molten metal
- continuous casting
- mold
- swirling flow
- casting method
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Description
本発明は、金属溶湯の連続鋳造方法の改良に関
する。
The present invention relates to an improvement in a continuous casting method for molten metal.
鋼をはじめとする合金の連続鋳造においては、
鋳片表皮下の気泡形成と介在物を低減し、鋳片中
の偏析と冷却方向の結晶成長とを最少限におさえ
るため、凝固しつつある溶湯を撹拌することが必
要であつて、このためにさまざまな努力がなされ
ている。
通常実施されているのは電磁撹拌であつて、最
も強力にこれを行なう場合は、電磁撹拌装置
EMS（Electro Magnetic Stirrer）を、モールド
内（Ｍ−EMS）、モールド下の第二次（Ｓ−
EMS）および全凝固直前の最終（Ｆ−EMS）の
各段階に設ける。
これらの電磁撹拌手段は、多額の設備費を必要
とするわりには、効果が決定的とはいえないうら
みがあつた。発明者らの一人は、さきに共同者と
ともに、EMSとくにＭ―EMSに代わり得る溶湯
撹拌手段を探求し、連続鋳造において浸漬ノズル
を通じてモールド内へ溶湯を供給する際に、溶湯
が吐出される勢いを利用して自然な旋回流を発生
させて撹拌に役立てることを着想し、その効果を
確認してすでに提案した（特願昭56−176652号）。
さきに開示した連続鋳造方法は、金属溶湯を水
冷モールド内へ浸漬ノズルを通じて供給吐出して
行なう連続鋳造において、吐出流を、吐出の中心
に関して対称な複数の位置において接線方向に、
かつモールド面に対して、平行でも直角でもない
斜めの方向に向け、モールド内溶湯に水平方向の
旋回流を発生させることを特徴とする。
その後さらに研究を重ねたところ、上記の吐出
流を斜め方向に向けて旋回流を発生させること
と、Ｍ―EMSとを組み合わせることにより、予
期を超えた強力な撹拌が実現することを見出し
た。
In continuous casting of alloys such as steel,
It is necessary to stir the solidifying molten metal in order to reduce the formation of bubbles and inclusions under the skin of the slab, and to minimize segregation in the slab and crystal growth in the direction of cooling. Various efforts have been made. Usually, electromagnetic stirring is used, and the most powerful method is to use an electromagnetic stirring device.
EMS (Electro Magnetic Stirrer) is installed inside the mold (M-EMS) and under the mold (S-
EMS) and the final stage (F-EMS) just before total solidification. Although these electromagnetic stirring means require a large amount of equipment cost, they have the disadvantage that their effects are not decisive. One of the inventors, together with his co-workers, first explored a means of stirring molten metal that could replace EMS, especially M-EMS, and discovered that the force with which molten metal is discharged when it is supplied into a mold through an immersion nozzle in continuous casting. He came up with the idea of using this to generate a natural swirling flow to aid in stirring, and after confirming its effectiveness, he has already proposed it (Japanese Patent Application No. 176,652/1982). The continuous casting method disclosed above is continuous casting in which molten metal is supplied and discharged into a water-cooled mold through a submerged nozzle, and the discharge flow is tangentially directed at a plurality of positions symmetrical about the center of discharge.
It is also characterized by generating a horizontal swirling flow in the molten metal in the mold in an oblique direction that is neither parallel nor perpendicular to the mold surface. After further research, they discovered that by combining the above-mentioned discharge flow diagonally to generate a swirling flow and M-EMS, a more powerful stirring than expected could be achieved.
従つて本発明の目的は、この知見を利用して、
効果的なモールド内溶鋼の撹拌を可能にし、改良
された連続鋳造の技術を提供することにある。
Therefore, the object of the present invention is to utilize this knowledge to
The object of the present invention is to enable effective stirring of molten steel in a mold and to provide an improved continuous casting technique.
本発明の連続鋳造方法は、金属溶湯を水冷モー
ルド内へ浸漬ノズルを通じて供給吐出して行なう
連続鋳造において、第１図または第２図に示すよ
うに、すべての吐出流をモールド面に対して同じ
側に傾斜した方向に向け、モールド内溶湯に水平
方向の旋回流を発生させるとともに、同じ方向に
溶湯を旋回する駆動力をもたらす電磁撹拌手段を
併用することにより、溶湯の外周部付近において
最も強い旋回流を実現することを特徴とする。
第１図は、前述したさきの発明に従つて、吐出
流を接線方向にした場合の溶湯の流れの方向を示
す。第２図は、吐出流を中心から放射方向にした
場合の、溶湯の流れの方向を示す。
本発明の連続鋳造方法は、モールド面の長辺と
短辺の比が１またはそれに近い鋳片を得るのに適
している。
旋回流を発生させる方向は、溶湯面の上方から
みて、左回り（反時計回り）にすることが好まし
い。これは、北半球で発生する渦は、地球の自転
の影響を受けて左回りになるので、それと同じ方
向をえらべば、旋回が容易になるからである。
The continuous casting method of the present invention is a continuous casting method in which molten metal is supplied and discharged into a water-cooled mold through a submerged nozzle.As shown in FIG. 1 or FIG. By using an electromagnetic stirring means that generates a horizontal swirling flow in the molten metal in the mold in a direction that is inclined to the side, and also provides a driving force to swirl the molten metal in the same direction, the flow is strongest near the outer periphery of the molten metal. It is characterized by realizing a swirling flow. FIG. 1 shows the direction of flow of molten metal when the discharge flow is tangential, according to the previous invention described above. FIG. 2 shows the flow direction of the molten metal when the discharge flow is radial from the center. The continuous casting method of the present invention is suitable for obtaining a slab in which the ratio of the long side to the short side of the mold surface is 1 or close to it. The direction in which the swirling flow is generated is preferably to the left (counterclockwise) when viewed from above the molten metal surface. This is because vortices that occur in the Northern Hemisphere rotate counterclockwise due to the influence of the Earth's rotation, so if you choose the same direction, it will be easier to turn.
溶湯に加わる撹拌力の強さは、湯面における旋
回流の流速を概念的なグラフにした、第３図に示
すような分布をとる。すべての吐出流をモールド
面に対して同じ側に傾斜した方向に向け、モール
ド面で反射させることにより発生する旋回流
に、Ｍ―EMSがもたらす旋回駆動力が組み合
わされて、で示したような旋回流が生じるので
ある。
その流速は、たとえば鋼の鋳造において代表的
な形状寸法のモールドにおいて、20〜30cm／sec
程度（回転数にして、数〜30rpm）である。
The strength of the stirring force applied to the molten metal has a distribution as shown in Figure 3, which is a conceptual graph of the flow velocity of the swirling flow at the molten metal surface. The swirling flow generated by directing all the discharge flows to the same side with respect to the mold surface and reflecting them at the mold surface is combined with the swirling driving force produced by M-EMS, resulting in the flow as shown in This results in a swirling flow. The flow rate is, for example, 20 to 30 cm/sec in a mold with a typical shape and size for steel casting.
(number of revolutions, several to 30 rpm).
このような、モールド内溶湯に対して強い撹拌
力、とくにその外周部近くにおいて最も強い撹拌
力が得られると、介在物が浮上しやすくなつて、
鋳片の内部欠陥の防止にとり、きわめて効果的で
ある。従つて本発明の連続鋳造方法は、品質上の
要求が最もきびしいグレードの製品を製造する場
合に、その意義が大きい。
If such a strong stirring force is obtained for the molten metal in the mold, especially the strongest stirring force near the outer periphery, inclusions will easily float up.
It is extremely effective in preventing internal defects in slabs. Therefore, the continuous casting method of the present invention is of great significance when manufacturing a grade of product with the most stringent quality requirements.
第１図および第２図は、本発明の連続鋳造方法
の原理を説明するための、溶湯の吐出流の方向を
示す概念的な図である。第３図は、第１図および
第２図における溶湯撹拌の状況を、湯面における
旋回流の流速をもつてあらわした概念的なグラフ
である。
1 and 2 are conceptual diagrams showing the direction of the discharge flow of molten metal for explaining the principle of the continuous casting method of the present invention. FIG. 3 is a conceptual graph showing the state of molten metal stirring in FIGS. 1 and 2 in terms of the flow velocity of the swirling flow at the surface of the molten metal.
Claims (1)
じて供給吐出して行なう連続鋳造において、すべ
ての吐出流をモールド面に対して同じ側に傾斜し
た方向に向け、モールド内溶湯に水平方向の旋回
流を発生させるとともに、同じ方向に溶湯を旋回
する駆動力をもたらす電磁撹拌手段を併用するこ
とにより、溶湯の外周部付近において最も強い旋
回流を実現することを特徴とする連続鋳造方法。 ２ 旋回流の方向が上方からみて反時計回りであ
る特許請求の範囲第１項の連続鋳造方法。 ３ 金属溶湯が溶鋼である特許請求の範囲第１項
または第２項の連続鋳造方法。[Claims] 1. In continuous casting, in which molten metal is supplied and discharged into a water-cooled mold through a submerged nozzle, all discharge flows are directed in a direction inclined to the same side with respect to the mold surface, and are horizontal to the molten metal in the mold. A continuous casting method characterized by generating a swirling flow in one direction and realizing the strongest swirling flow near the outer periphery of the molten metal by using an electromagnetic stirring means that provides a driving force to swirl the molten metal in the same direction. . 2. The continuous casting method according to claim 1, wherein the direction of the swirling flow is counterclockwise when viewed from above. 3. The continuous casting method according to claim 1 or 2, wherein the molten metal is molten steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19624982A JPS5985352A (en) | 1982-11-09 | 1982-11-09 | Continuous casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19624982A JPS5985352A (en) | 1982-11-09 | 1982-11-09 | Continuous casting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5985352A JPS5985352A (en) | 1984-05-17 |
| JPH0130584B2 true JPH0130584B2 (en) | 1989-06-21 |
Family
ID=16354660
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19624982A Granted JPS5985352A (en) | 1982-11-09 | 1982-11-09 | Continuous casting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5985352A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07163977A (en) * | 1993-09-22 | 1995-06-27 | Shigenobu Fujimoto | Method and device for treatment of water |
| JP4613922B2 (en) * | 2007-03-29 | 2011-01-19 | Ｊｆｅスチール株式会社 | Steel continuous casting method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55158857A (en) * | 1979-05-28 | 1980-12-10 | Nippon Steel Corp | Continuous casting method of steel slab |
-
1982
- 1982-11-09 JP JP19624982A patent/JPS5985352A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5985352A (en) | 1984-05-17 |
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