JP2001219255A - Flow control apparatus for molten metal - Google Patents
Flow control apparatus for molten metalInfo
- Publication number
- JP2001219255A JP2001219255A JP2000031809A JP2000031809A JP2001219255A JP 2001219255 A JP2001219255 A JP 2001219255A JP 2000031809 A JP2000031809 A JP 2000031809A JP 2000031809 A JP2000031809 A JP 2000031809A JP 2001219255 A JP2001219255 A JP 2001219255A
- Authority
- JP
- Japan
- Prior art keywords
- linear motor
- magnetic flux
- mold
- molten metal
- control apparatus
- 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
Landscapes
- Continuous Casting (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は溶融金属の流動制御
装置に係り、特に、溶融金属にモールド内循環力を付与
する電磁攪拌装置と溶融金属の下降流に対して制動力を
付与する電磁制動装置の相互干渉を低減することのでき
る溶融金属の流動制御装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for controlling the flow of molten metal, and more particularly to an electromagnetic stirrer for applying a circulation force to a molten metal in a mold and an electromagnetic brake for applying a braking force to a downward flow of the molten metal. The present invention relates to a molten metal flow control device capable of reducing mutual interference between devices.
【０００２】[0002]
【従来の技術】溶鉱炉で溶融された溶鋼からスラブを生
産する連続鋳造においては、レードル内の溶鋼はタンデ
ィシュを介して浸漬ノズルからモールド内に注入され
る。そして、溶鋼はモールド底面から引き出されスラブ
に成形される。スラブ成形の際モールド内の溶鋼に水平
方向の温度が不均一であるとスラブに表面割れやシェル
破断が生じ易いので、モールド側壁外側上端にリニアモ
ータ装置を設置し、溶鋼をモールド内で循環させて溶鋼
温度を均一にすることが既に提案、実用化されている。2. Description of the Related Art In continuous casting for producing a slab from molten steel melted in a blast furnace, molten steel in a ladle is injected into a mold through a tundish from an immersion nozzle. Then, the molten steel is drawn from the bottom of the mold and formed into a slab. If the temperature of the molten steel in the mold in the horizontal direction is not uniform during slab molding, surface cracks and shell ruptures are likely to occur in the slab. Making the molten steel temperature uniform has already been proposed and put into practical use.
【０００３】さらに、溶鋼の表面に存在するパウダの巻
き込みによりスラブの品質が低下することを防止するた
めに、モールド内で溶鋼の下降流を抑制する電磁制動装
置を設置することも提案、実用化されている。図１はリ
ニアモータ装置及び電磁制動装置を具備したモールドの
縦断面図であって、モールド１０の上方にはリニアモー
タ装置１１が、中段には電磁制動装置１２が設置されて
いる。Further, in order to prevent the quality of the slab from deteriorating due to the entrainment of powder existing on the surface of the molten steel, it has been proposed and put into practice to install an electromagnetic braking device for suppressing the downward flow of the molten steel in the mold. Have been. FIG. 1 is a longitudinal sectional view of a mold provided with a linear motor device and an electromagnetic braking device. A linear motor device 11 is provided above a mold 10 and an electromagnetic braking device 12 is provided in a middle stage.
【０００４】図２はリニアモータ装置１１の上面図であ
って、モールド１０の対向する側面に沿ってリニアモー
タ用鉄芯１１１及び１１２が設置されている。このリニ
アモータ用鉄芯１１１及び１１２にはモールド１０の対
向する側面に垂直な平面内でリニアモータ用コイル１１
３及び１１４が巻回されている。リニアモータ用コイル
１１３及び１１４は、それぞれ例えば３６個のコイルか
ら構成されているが、３６個のコイルは６個づつ６組に
分割されている。FIG. 2 is a top view of the linear motor device 11, and iron cores 111 and 112 for linear motors are installed along opposing side surfaces of the mold 10. These linear motor cores 111 and 112 have linear motor coils 11 in a plane perpendicular to the opposite side surface of mold 10.
3 and 114 are wound. The linear motor coils 113 and 114 are each composed of, for example, 36 coils, and the 36 coils are divided into six sets of six coils each.
【０００５】各組の６個のコイルは直列接続されてお
り、各組には三相交流電源１１５のＵ、Ｖ及びＷ相電流
が供給される。即ち、リニアモータ用コイル１１３の各
組には右側から逆Ｕ相電流、正Ｖ相電流、逆Ｗ相電流、
正Ｕ相電流、逆Ｖ相電流、正Ｗ相電流が供給され、リニ
アモータ用コイル１１４の各組には左側から逆Ｕ相電
流、正Ｖ相電流、逆Ｗ相電流、正Ｕ相電流、逆Ｖ相電
流、正Ｗ相電流が供給される。[0005] The six coils of each set are connected in series, and the U, V and W phase currents of the three-phase AC power supply 115 are supplied to each set. In other words, the reverse U-phase current, the positive V-phase current, the reverse W-phase current,
A positive U-phase current, a reverse V-phase current, and a positive W-phase current are supplied, and a reverse U-phase current, a positive V-phase current, a reverse W-phase current, a positive U-phase current, A reverse V-phase current and a positive W-phase current are supplied.
【０００６】従って、リニアモータ装置が励磁されたと
きは、リニアモータ用コイル１１３に沿って左から右に
向かう移動磁界が、リニアモータ用コイル１１４に沿っ
て右から左に向かう移動磁界が発生し、溶鋼にはモール
ド内循環力が付与される。図３は電磁制動装置１２の上
面図であって、モールド１０の周囲に電磁制動用鉄芯１
２１が配置されている。そして、電磁制動用鉄芯１２１
にはモールド１０の対向する側面に平行な平面内で電磁
制動用コイル１２２及び１２３が巻回されている。Therefore, when the linear motor device is excited, a moving magnetic field from left to right along the linear motor coil 113 and a moving magnetic field from right to left along the linear motor coil 114 are generated. The circulation force in the mold is applied to the molten steel. FIG. 3 is a top view of the electromagnetic braking device 12.
21 are arranged. Then, the electromagnetic braking iron core 121
The electromagnetic braking coils 122 and 123 are wound in a plane parallel to the opposite side surface of the mold 10.
【０００７】この電磁制動用コイル１２２及び１２３を
直流電源１２４で励磁すると、モールド１０を貫通する
磁束が発生する。この磁束中を溶鋼が下降すると、フレ
ミングの右手の法則に基づき溶鋼中をモールド側壁と平
行方向に流れる電流が惹起される。すると、この磁束と
この電流の相互作用によりフレミングの左手の法則に基
づき上向きのローレンツ力が発生し、溶鋼の下降流は制
動される。When the electromagnetic braking coils 122 and 123 are excited by the DC power supply 124, a magnetic flux penetrating the mold 10 is generated. When the molten steel descends in the magnetic flux, an electric current is generated which flows in the molten steel in a direction parallel to the mold side wall based on Fleming's right-hand rule. Then, the interaction between the magnetic flux and the current generates an upward Lorentz force based on Fleming's left-hand rule, and the descending flow of the molten steel is braked.
【０００８】溶鋼の下降流はモールド１０の上方ほど強
いので、電磁制動装置１２はモールドのできる限り上方
に設置することが望ましい。Since the descending flow of the molten steel is higher above the mold 10, it is desirable that the electromagnetic braking device 12 be installed as high as possible above the mold.
【０００９】[0009]
【発明が解決しようとする課題】しかしながら、電磁制
動装置１２を上方に設置した場合には、電磁制動装置１
２によって惹起された直流磁束とリニアモータ装置によ
り付与された溶鋼の循環力との相互作用により発生する
ローレンツ力により循環力が弱められることは回避でき
ない。However, when the electromagnetic braking device 12 is installed above, the electromagnetic braking device
It is unavoidable that the circulating force is weakened by the Lorentz force generated by the interaction between the DC magnetic flux induced by 2 and the circulating force of the molten steel provided by the linear motor device.
【００１０】そして、溶鋼の循環流が弱まると、溶鋼に
水平方向の温度が不均一となり、スラブに表面割れやシ
ェル破断が発生するおそれも増大する。本発明は上記課
題に鑑みなされたものであって、リニアモータ装置と電
磁制動装置の相互干渉により溶鋼の循環流が制動される
ことを防止することのできる溶融金属の流動制御装置を
提供することを目的とする。When the circulating flow of the molten steel is weakened, the temperature of the molten steel in the horizontal direction becomes non-uniform, and the possibility that surface cracks and shell fractures occur in the slab increases. The present invention has been made in view of the above problems, and provides a molten metal flow control device capable of preventing a circulating flow of molten steel from being braked by mutual interference between a linear motor device and an electromagnetic braking device. With the goal.
【００１１】[0011]
【課題を解決するための手段】第１の発明に係る溶融金
属の流動制御装置は、溶融金属にモールド内循環力を付
与するリニアモータ装置と、リニアモータ装置の下方に
設置され溶融金属の下降流を制動する制動装置と、リニ
アモータ装置と制動装置の間に設置される磁束遮蔽板
と、を具備する。According to a first aspect of the present invention, there is provided a molten metal flow control device which applies a circulating force within a mold to a molten metal, and a lowering device for the molten metal which is installed below the linear motor device. A braking device for braking the flow, and a magnetic flux shielding plate installed between the linear motor device and the braking device.
【００１２】本発明にあっては、リニアモータ装置と制
動装置の間に磁束遮蔽板を設置することによりリニアモ
ータ装置近傍における制動装置によって惹起される磁束
が低減される。第２の発明に係る溶融金属の流動制御装
置は、磁束遮蔽板のモールド側面に垂直方向の長さが制
動装置のモールド側面に垂直方向の長さの１／２以上で
ある。In the present invention, the magnetic flux induced by the braking device near the linear motor device is reduced by installing the magnetic flux shielding plate between the linear motor device and the braking device. In the molten metal flow control device according to the second invention, the length of the magnetic flux shielding plate in the direction perpendicular to the mold side surface is at least １ ／ of the length in the direction perpendicular to the mold side surface of the braking device.
【００１３】本発明にあっては、磁束遮蔽板のモールド
側面に垂直方向の長さは制動装置のモールド側面に垂直
方向の長さの１／２以上とされる。In the present invention, the length of the magnetic flux shielding plate in the direction perpendicular to the mold side surface is at least half the length in the direction perpendicular to the mold side surface of the braking device.
【００１４】[0014]
【発明の実施の形態】図４は本発明に係る溶融金属の流
動制御装置の構成図であって、モールド１０の上端には
溶鋼に循環力を付与するリニアモータ装置１１が、そし
てモールド１０の中段には溶鋼の下降流に対して制動力
を付与する電磁制動装置１２が設置される。FIG. 4 is a block diagram of a molten metal flow control device according to the present invention. A linear motor device 11 for applying a circulating force to molten steel is provided at an upper end of a mold 10 and a mold 10 is provided. An electromagnetic braking device 12 for applying a braking force to the descending flow of molten steel is installed in the middle stage.
【００１５】さらに、リニアモータ装置１１と電磁制動
装置１２の間には、電磁制動装置１２によって惹起され
る磁束を遮蔽するために磁束遮蔽板１３が配置される。
なお、図５は磁束遮蔽板１３の上面図である。磁束遮蔽
板１３の長さはモールドの側壁と同一であるが、幅Ｌは
相互干渉が十分に減衰するように決定することが必要で
ある。Further, a magnetic flux shielding plate 13 is arranged between the linear motor device 11 and the electromagnetic braking device 12 to shield magnetic flux generated by the electromagnetic braking device 12.
FIG. 5 is a top view of the magnetic flux shielding plate 13. The length of the magnetic flux shielding plate 13 is the same as the side wall of the mold, but the width L needs to be determined so that mutual interference is sufficiently attenuated.
【００１６】[0016]
【表１】 [Table 1]
【００１７】［表１］は磁束遮蔽板１３の幅Ｌをパラメ
ータとしたときの電磁制動装置１２によりリニアモータ
装置１１中心及び電磁制動装置１２中心で惹起される磁
束密度の測定結果である。なお磁束遮蔽板１３の幅Ｌは
電磁制動装置１２の幅ＬB で正規化しており、例えば２
／４幅は磁束遮蔽板１３の幅Ｌが（２／４×ＬB ）であ
ることを表している。Table 1 shows the measurement results of the magnetic flux density induced at the center of the linear motor device 11 and the center of the electromagnetic braking device 12 by the electromagnetic braking device 12 when the width L of the magnetic flux shielding plate 13 is used as a parameter. Note the width L of the magnetic flux shielding plate 13 is normalized by the width L B of the electromagnetic brake device 12, for example 2
The / 4 width indicates that the width L of the magnetic flux shielding plate 13 is (2/4 × L B ).
【００１８】ここで電磁制動装置１２によって惹起され
る直流磁束に起因するメニスカスにおける溶鋼の循環を
妨げるローレンツ力は磁束密度の二乗に比例するので、
この表から判明するように４／４幅、即ちＬ＝ＬB の磁
束遮蔽板１３を設置した場合はリニアモータ装置１１中
心における直流磁束に起因する磁束密度は磁束遮蔽板１
３を設置しない場合の３６．５％に低減するので、溶鋼
の循環を妨げるローレンツ力は１３．３％に低減する。Here, the Lorentz force that prevents the circulation of molten steel in the meniscus due to the DC magnetic flux induced by the electromagnetic braking device 12 is proportional to the square of the magnetic flux density.
4/4 width to be seen from this table, i.e. L = L flux density when installed the magnetic flux shielding plate 13 due to the DC magnetic flux in the linear motor unit 11 around the B is the magnetic flux shielding plate 1
3 is reduced to 36.5% when not installed, and the Lorentz force that hinders the circulation of molten steel is reduced to 13.3%.
【００１９】これに対して、電磁制動装置１２中心にお
いては磁束密度は８５．４％に、制動力は７２．９％低
下するものの、低減量はリニアモータ装置１１中心位置
よりも格段に少ない。即ち、リニアモータ装置１１と電
磁制動装置１２の間に磁束遮蔽板１３を配置することに
より電磁制動装置１２の制動力も若干低下するものの、
溶鋼の循環を妨げるローレンツ力の発生を確実に抑制す
ることが可能となる。On the other hand, the magnetic flux density is reduced to 85.4% and the braking force is reduced by 72.9% at the center of the electromagnetic braking device 12, but the reduction is much smaller than that at the center position of the linear motor device 11. That is, although the magnetic flux shielding plate 13 is disposed between the linear motor device 11 and the electromagnetic braking device 12, the braking force of the electromagnetic braking device 12 is slightly reduced.
It is possible to reliably suppress the generation of Lorentz force that hinders the circulation of molten steel.
【００２０】なお、磁束遮蔽板１３の幅Ｌを１／４幅に
まで狭めた場合には溶鋼の循環を妨げるローレンツ力は
約３０％しか減少しないので、磁束遮蔽板１３の幅Ｌは
２／４以上とすることが望ましい。When the width L of the magnetic flux shielding plate 13 is reduced to 1/4, the Lorentz force that hinders the circulation of molten steel is reduced by only about 30%. It is desirable that the number be 4 or more.
【００２１】[0021]
【発明の効果】本発明に係る溶融金属の流動制御装置に
よれば、磁束遮蔽板によってリニアモータ装置の設置位
置で発生する制動装置によって惹起される磁束が遮蔽さ
れ、リニアモータ装置によって付与される循環力の低減
を防止することが可能となる。According to the molten metal flow control device of the present invention, the magnetic flux induced by the braking device generated at the installation position of the linear motor device is shielded by the magnetic flux shielding plate, and is applied by the linear motor device. It is possible to prevent the circulation force from being reduced.
【図１】リニアモータ装置及び電磁制動装置を具備した
モールドの断面図である。FIG. 1 is a cross-sectional view of a mold including a linear motor device and an electromagnetic braking device.
【図２】リニアモータ装置の上面図である。FIG. 2 is a top view of the linear motor device.
【図３】電磁制動装置の上面図である。FIG. 3 is a top view of the electromagnetic braking device.
【図４】本発明に係る溶融金属の流動制御装置の構成図
である。FIG. 4 is a configuration diagram of a molten metal flow control device according to the present invention.
【図５】磁束遮蔽板の上面図である。FIG. 5 is a top view of the magnetic flux shielding plate.
１０…モールド １１…リニアモータ装置 １２…電磁制動装置 １３…磁束遮蔽板 DESCRIPTION OF SYMBOLS 10 ... Mold 11 ... Linear motor device 12 ... Electromagnetic braking device 13 ... Magnetic flux shielding plate
───────────────────────────────────────────────────── フロントページの続き (72)発明者 田中 誠 千葉県富津市新富20−１ 新日本製鐵株式 会社技術開発本部内 Ｆターム(参考） 4E004 AA09 MB11 MB12 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Makoto Tanaka 20-1 Shintomi, Futtsu-shi, Chiba F-term in the Technology Development Division, Nippon Steel Corporation 4E004 AA09 MB11 MB12
Claims (2)
リニアモータ装置と、 前記リニアモータ装置の下方に設置され、溶融金属の下
降流を制動する制動装置と、 前記リニアモータ装置と前記制動装置の間に設置される
磁束遮蔽板と、を具備する溶融金属の流動制御装置。A linear motor device for applying a circulating force within the mold to the molten metal; a braking device installed below the linear motor device for braking a downward flow of the molten metal; a linear motor device and the braking device And a magnetic flux shielding plate installed between the two.
直方向の長さが、前記制動装置の前記モールド側面に垂
直方向の長さの１／２以上である請求項１に記載の溶融
金属の流動制御装置。2. The molten metal according to claim 1, wherein a length of the magnetic flux shielding plate in a direction perpendicular to the side surface of the mold is at least １ ／ of a length of the braking device in a direction perpendicular to the side surface of the mold. Flow control device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000031809A JP3793384B2 (en) | 2000-02-09 | 2000-02-09 | Molten metal flow control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000031809A JP3793384B2 (en) | 2000-02-09 | 2000-02-09 | Molten metal flow control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001219255A true JP2001219255A (en) | 2001-08-14 |
| JP3793384B2 JP3793384B2 (en) | 2006-07-05 |
Family
ID=18556506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000031809A Expired - Lifetime JP3793384B2 (en) | 2000-02-09 | 2000-02-09 | Molten metal flow control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3793384B2 (en) |
-
2000
- 2000-02-09 JP JP2000031809A patent/JP3793384B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP3793384B2 (en) | 2006-07-05 |
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