JPS62134150A - Method for preventing intrusion of nonmetallic inclusion during pouring of molten metal - Google Patents
Method for preventing intrusion of nonmetallic inclusion during pouring of molten metalInfo
- Publication number
- JPS62134150A JPS62134150A JP27350785A JP27350785A JPS62134150A JP S62134150 A JPS62134150 A JP S62134150A JP 27350785 A JP27350785 A JP 27350785A JP 27350785 A JP27350785 A JP 27350785A JP S62134150 A JPS62134150 A JP S62134150A
- Authority
- JP
- Japan
- Prior art keywords
- molten metal
- inclusions
- molten steel
- pouring
- intermediate container
- 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
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)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、溶融金属の注湯時における非金属介在物の
混入防止方法に関し、とくに電磁力による遠心力を利用
して溶融金属中に混在する非金属介在物を除去しつつ注
湯する場合において、非金属介在物の除去効果のより一
層の向上を図ったものである。Detailed Description of the Invention (Field of Industrial Application) This invention relates to a method for preventing non-metallic inclusions from being mixed in when pouring molten metal, and in particular, by utilizing centrifugal force caused by electromagnetic force. This is intended to further improve the effect of removing non-metallic inclusions when pouring while removing non-metallic inclusions.
（従来の技術）
溶融金属中の非金属介在物は、鋳込み金属の内質欠陥と
なるばかりでなく、たとえば連続鋳造においては、鋳型
内の浸漬ノズルの内面に付着堆積してノズルを閉塞し、
鋳造が事実上不可能となるといった操業上のトラブルも
招いていた。(Prior Art) Non-metallic inclusions in molten metal not only cause internal defects in the cast metal, but also, in continuous casting, for example, they adhere and accumulate on the inner surface of the immersion nozzle in the mold, clogging the nozzle.
This also led to operational problems, such as making casting virtually impossible.
従来、この主のトラブルを防ぐ手段としては、溶融金属
の中間容器であるタンディツシュ内に堰を設け、金属上
昇流を導くことによって介在物を浮上分離させる方法、
あるいは溶融金属が通過する皿内もしくは浸漬ノズル内
の流路にフィルターを設置し、該フィルターによって介
在物を除去する方法などが知られている。Conventionally, methods to prevent this problem include a method in which a weir is installed in a tundish, which is an intermediate container for molten metal, and inclusions are floated and separated by guiding an upward flow of metal;
Alternatively, a method is known in which a filter is installed in a channel through which molten metal passes in a dish or in a submerged nozzle, and inclusions are removed by the filter.
前者の堰を用いる方法は、重力分離を利用する方法であ
って、溶融金属との密度差が比較的大きくなる大径介在
物の除去には有効ではあるものの小径介在物の除去は十
分とはいえず、さらに後者のフィルターを設置する方法
は、フィルターの目詰まりによる圧損上昇をもたらし、
生産性の点に問題が残る。The former method using a weir utilizes gravity separation, and although it is effective in removing large-diameter inclusions that have a relatively large density difference with the molten metal, it is not sufficient to remove small-diameter inclusions. Moreover, the latter method of installing a filter causes an increase in pressure drop due to filter clogging,
Problems remain in terms of productivity.
ところで最近、特開昭６０−５６４６８号公報において
、電磁力を利用した溶融金属回転流により発生する遠心
力を利用して、介在物を除去しつつ注湯を行う鋳造方法
が提案された。Recently, Japanese Patent Application Laid-Open No. 60-56468 proposed a casting method in which pouring is performed while removing inclusions by using centrifugal force generated by a rotating flow of molten metal using electromagnetic force.
（発明が解決しようとする問題点）
しかしながら上記の方法では、鋳型内への溶融金属の注
入が、溶融金属収納容器の下面中央部に開口させた取り
出し口から行われていたために、第２図ａに示したよう
に、容器内の溶湯高さが十分に高い場合には、分離浮上
した介在物の注湯流中への混入のおそれはないものの、
同図すに示したように溶湯高さが低くなった場合には、
上記介在物の混入を免れ得ないところに問題を残してい
た。(Problems to be Solved by the Invention) However, in the above method, the molten metal is injected into the mold through the outlet opened at the center of the lower surface of the molten metal storage container, and therefore, as shown in FIG. As shown in a, if the height of the molten metal in the container is sufficiently high, there is no risk of separated and floated inclusions getting mixed into the pouring flow;
When the height of the molten metal decreases as shown in the figure,
The problem remains that the inclusion of the above-mentioned inclusions cannot be avoided.
この発明は、上記の問題をを利に解決するもので、中間
容器内の溶融金属に電磁力を利用して回転流を与え、そ
の遠心力によって非金属介在物を除去しつつ注湯を行う
方法において、中間容器内の溶融金属の高さの如何にか
かわらず、注湯流中への非金属介在物の混入を効果的に
阻止し得る方法を提案することを目的とする。This invention advantageously solves the above problem by applying a rotational flow to the molten metal in the intermediate container using electromagnetic force, and pouring the molten metal while removing non-metallic inclusions by the centrifugal force. It is an object of the present invention to propose a method that can effectively prevent non-metallic inclusions from being mixed into the poured metal flow, regardless of the height of the molten metal in the intermediate container.
（問題点を解決するための手段）
すなわちこの発明は、溶融金属を収容する円筒状の中間
容器の外面から回転磁場を印加して、該容器内溶融金属
を回転撹拌しつつ鋳型内に注湯する方法において、中間
容器からの溶融金属の注湯を、該中間容器の下方外周部
もしくは底面り）縁部に設けた取り出し口から行うこと
を特徴とする、溶融金属の注湯時における非金属介在物
の混入防止方法である。(Means for solving the problem) That is, the present invention applies a rotating magnetic field from the outer surface of a cylindrical intermediate container containing molten metal, and pours the molten metal into the mold while rotating and stirring the molten metal in the container. A method for pouring molten metal from an intermediate container through an outlet provided at the lower outer periphery or bottom edge of the intermediate container. This is a method for preventing the inclusion of inclusions.
この発明において、中間容器の下方外周面に設置される
取り出し口から注湯される溶融金属の流路を、中間容器
内の溶融回転流の接線方向に一致させることが〜容器内
耐火物の無用の溶損を避ける上で好ましく、また介在物
除去効果のより一層の向上のためには、上記流路にフィ
ルターを設置することが望ましい。In this invention, the flow path of the molten metal poured from the outlet installed on the lower outer circumferential surface of the intermediate container can be aligned with the tangential direction of the rotating melt flow in the intermediate container. It is preferable to install a filter in the flow path in order to avoid melting and loss of the liquid, and to further improve the effect of removing inclusions.
以下この発明を具体的に説明する。This invention will be explained in detail below.
まずこの発明の基礎となった実験結果から説明する。First, the experimental results that formed the basis of this invention will be explained.
第３図に、実験に用いた５トンの溶鋼を収容し得る５Ｕ
Ｓ３０４を外皮とする円筒状の中間容器ｌを、該容器内
溶湯に回転流を与えるために設置した回転磁界発生コイ
ル（２極３相コイル）２と共に示す。Figure 3 shows the 5U, which can accommodate 5 tons of molten steel used in the experiment.
A cylindrical intermediate container 1 having S304 as its outer shell is shown together with a rotating magnetic field generating coil (two-pole three-phase coil) 2 installed to provide a rotational flow to the molten metal in the container.
さて上記の中間容器１内に、ＡＩで脱酸した溶鋼３を収
容し、回転を与えつつ溶鋼３のサンプリングを行って、
溶融金属中の非金属介在物分布に対応する鋼中酸素分布
について調査したところ、第３図中に例示したとおりの
結果が得られた。Now, the molten steel 3 deoxidized by AI is placed in the intermediate container 1, and the molten steel 3 is sampled while being rotated.
When the oxygen distribution in steel corresponding to the distribution of nonmetallic inclusions in molten metal was investigated, the results as illustrated in FIG. 3 were obtained.
また容器１の中央域には、図示したような紡錘状に集積
した介在物量４が認められ、従って溶湯高さが低い場合
に、容器の底面中央部から溶鋼を取り出した場合には、
前述した通り介在物の混入が危惧される。とくに介在物
の除去効率を」二げるべく溶鋼回転速度を上げた場合に
は、溶融金属中央部の凹みが大きくなるため、集積介在
物塊しヘルも下がることから、ますまず混入のおそれが
強まる。Further, in the center area of the container 1, there is an amount of inclusions 4 accumulated in a spindle shape as shown in the figure. Therefore, when the height of the molten metal is low and the molten steel is taken out from the center of the bottom of the container,
As mentioned above, there is a risk of inclusion of inclusions. In particular, when the rotation speed of molten steel is increased in order to increase the removal efficiency of inclusions, the depression in the center of the molten metal becomes larger, which causes the inclusions to accumulate and reduce the heat, which increases the risk of contamination. Get stronger.
この点、容器の外周下方および底面外縁は、酸素濃度が
低い従って介在物量は少なく、またたとえ溶湯高さが低
下したとしても介在物の混入のおそれは極めて小さい。In this respect, the lower outer periphery and the outer edge of the bottom of the container have a low oxygen concentration, so the amount of inclusions is small, and even if the height of the molten metal is lowered, the risk of inclusions being mixed in is extremely small.
そこでこの発明では、中間容器からの溶鋼の取り出しを
、該容器の下方外周部または底面外縁部から行うことに
したのである。Therefore, in the present invention, the molten steel is taken out from the intermediate container from the lower outer periphery or the outer edge of the bottom surface of the container.
（作用）
この発明では、溶湯が回転撹拌しているわけであるから
、注湯に際し、取り出し口に溶湯が衝突して耐火物が損
耗するおそれがある。従って溶融金属と容器耐火物との
衝突に伴う耐火物の損耗に起因した介在物の無用の生成
を防ぐ観点からは、取り出し口を、溶湯回転流の接線方
向に向けて容器の外周下方に設けることがとりわけ有利
である。(Function) In the present invention, since the molten metal is rotated and stirred, there is a risk that the molten metal collides with the outlet when pouring the molten metal, causing damage to the refractory. Therefore, from the viewpoint of preventing the unnecessary formation of inclusions due to wear and tear of the refractory due to collision between the molten metal and the refractory of the container, the outlet is provided below the outer periphery of the container, facing in the tangential direction of the rotating flow of the molten metal. This is particularly advantageous.
この取り出しの際、溶湯流は遠心力によるヘッド圧を有
しているので、その流路にフィルターを設けたとしても
、該フィルターの圧用に打ち勝って、十分な溶湯流束を
確保し得る。During this extraction, the molten metal flow has head pressure due to centrifugal force, so even if a filter is provided in the flow path, the pressure of the filter can be overcome and a sufficient molten metal flux can be ensured.
（実施例）
実験に用いた注湯装置の基本構造を第１図に模式で示す
。図中５は取り出し口、６は流路、７は整・；流用のタ
ンディツシュ、８は連鋳用の鋳型、そして９ば取消であ
る。(Example) The basic structure of the pouring device used in the experiment is schematically shown in FIG. In the figure, 5 is an outlet, 6 is a flow path, 7 is a tundish for adjustment and diversion, 8 is a mold for continuous casting, and 9 is a cancellation.
同図？、こ示した円筒状の中間容器１内に、１００ｔｏ
ｎ取堝９から溶鋼を供給し、該容器１内で／８鋼を回転
磁界発生コイル２により回転撹拌させつつ、取り出し口
５から取り出し、流路６、整流用タンディツシュ７を介
して、連鋳用鋳型８内に注湯した。Same figure? , in the cylindrical intermediate container 1 shown here, 100 to
Molten steel is supplied from a draw basin 9, and the /8 steel is rotated and stirred in the container 1 by a rotating magnetic field generating coil 2, taken out from an outlet 5, and passed through a flow path 6 and a rectifying tundish 7 to be continuously cast. The metal was poured into the mold 8.
中間容器１からの溶鋼の取り出しは、次の各要領で行っ
た。The molten steel was taken out from the intermediate container 1 in the following manner.
（１１中間容器の底面外縁部に設＆Ｊた取り出し口から
取り出した場合（図示せず）。(11 When taken out from the outlet provided on the outer edge of the bottom of the intermediate container (not shown).
（２）中間容器の下方外周部から、溶鋼回転流の接線方
向に取り出した場合（図示例）。(2) When the molten steel is taken out from the lower outer periphery of the intermediate container in the tangential direction of the rotating flow of molten steel (illustrated example).
（３）上記（２）の方法において、整流用タンディツシ
ュに至る流路にセラミックス性のフィルター（図示せず
）を設けた場合。(3) In the method of (2) above, a case where a ceramic filter (not shown) is provided in the flow path leading to the rectifying tundish.
また比較のため、
ｉ）中間容器内の溶鋼に回転流を与えないで、中間容器
の下方外周部から接線方向に取り出乙た場合、および
ｉｉ）溶鋼に回転流を与えつつ、中間容器の底面中央部
から取り出した場合
についても実験した。For comparison, i) the molten steel in the intermediate container is taken out in the tangential direction from the lower outer periphery of the intermediate container without applying a rotational flow; An experiment was also conducted when the sample was taken out from the center of the bottom.
上記の各実験において、溶鋼としては、］、０Ｏｔｏｎ
取鍋内の旦レベルを３０〜４０ｐｐｍに揃えた低炭Ａｌ
キルト鋼を用い、各実験時における連鋳用鋳型８内鋼の
−９−含有量によって、介在物除去能を比較した。In each of the above experiments, the molten steel was ], 0 Oton
Low coal aluminum with a temperature level in the ladle of 30 to 40 ppm
Using quilt steel, the inclusion removal ability was compared based on the -9- content of the steel in the continuous casting mold 8 during each experiment.
表 １
本通常の状態、即ち）容鋼高さ物中間容器内直径を１と
した］旧１１表示。Table 1 This normal state, i.e.) Old 11 display with the internal diameter of the intermediate container for high steel containers being 1.
表１に示した成績より明らかなように、この発明に従っ
て注湯を行うことにより、非金属介在物の混入量が従来
に較べて格段に低減している。As is clear from the results shown in Table 1, by pouring according to the present invention, the amount of nonmetallic inclusions mixed in was significantly reduced compared to the conventional method.
（発明の効果）
かくしてこの発明によれば、中間容器内の溶融金属に回
転流を与えつつ注湯を行う場合に、該容器内の溶融金属
の高さの如何にかかわらず、注湯流中への非金属介在物
の混入を効果的に防止できる。(Effects of the Invention) Thus, according to the present invention, when pouring molten metal while applying a rotational flow to the molten metal in the intermediate container, regardless of the height of the molten metal in the container, the molten metal in the pouring flow is It is possible to effectively prevent non-metallic inclusions from being mixed in.
第１図は、この発明の実施に用いて好適な注湯装置の模
式図、
第２図ａ、ｂはそれぞれ、回転撹拌を利用する従来の注
湯方法における集積介在物臭の挙動を示した図、
第３図は、回転流による介在物の遠心分離効果の説明図
である。
第１図
Ａ−Ａ矢視図
第２図
ｃａ）（ｂ）
第３図Figure 1 is a schematic diagram of a pouring device suitable for carrying out the present invention, and Figures 2a and b respectively show the behavior of accumulated inclusion odor in a conventional pouring method using rotary stirring. Figure 3 is an explanatory diagram of the centrifugal separation effect of inclusions due to rotational flow. Figure 1 A-A arrow view Figure 2 ca) (b) Figure 3
Claims (1)
転磁場を印加して、該容器内溶融金属を回転撹拌しつつ
鋳型内に注湯する方法において、中間容器からの溶融金
属の注湯を、該中間容器の下方外周部もしくは底面外縁
部に設けた取り出し口から行うことを特徴とする、溶融
金属の注湯時における非金属介在物の混防止方法。 ２、中間容器の下方外周部に設置された取り出し口から
注湯される溶融金属の流路を、中間容器内の溶融金属回
転流の接線方向と一致させて成る特許請求の範囲第１項
に記載の方法。 ３、中間容器から、該容器内溶融金属回転流の接線方向
に取り出した溶融金属流の流路に、介在物除去用のフィ
ルターを設けて成る特許請求の範囲第１または２項記載
の方法。[Scope of Claims] 1. In a method for pouring molten metal into a mold while rotating and stirring the molten metal in the container by applying a rotating magnetic field from the outer surface of a cylindrical intermediate container containing molten metal, A method for preventing mixing of non-metallic inclusions during pouring of molten metal, characterized in that the molten metal is poured from an outlet provided at the lower outer periphery or the outer edge of the bottom of the intermediate container. 2. Claim 1, wherein the flow path of the molten metal poured from the outlet installed on the lower outer periphery of the intermediate container is aligned with the tangential direction of the rotating flow of molten metal in the intermediate container. Method described. 3. The method according to claim 1 or 2, wherein a filter for removing inclusions is provided in the flow path of the molten metal flow taken out from the intermediate container in the tangential direction of the rotating flow of molten metal in the container.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27350785A JPS62134150A (en) | 1985-12-06 | 1985-12-06 | Method for preventing intrusion of nonmetallic inclusion during pouring of molten metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27350785A JPS62134150A (en) | 1985-12-06 | 1985-12-06 | Method for preventing intrusion of nonmetallic inclusion during pouring of molten metal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62134150A true JPS62134150A (en) | 1987-06-17 |
| JPH0212665B2 JPH0212665B2 (en) | 1990-03-23 |
Family
ID=17528844
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27350785A Granted JPS62134150A (en) | 1985-12-06 | 1985-12-06 | Method for preventing intrusion of nonmetallic inclusion during pouring of molten metal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62134150A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0379513A1 (en) * | 1987-08-19 | 1990-08-01 | Massachusetts Institute Of Technology | Magnetic streamlining and flow control in tundishes |
| JPH02299751A (en) * | 1989-05-12 | 1990-12-12 | Kawasaki Steel Corp | Method for separating non-metallic inclusion in molten metal |
| JPH04187352A (en) * | 1990-11-19 | 1992-07-06 | Kawasaki Steel Corp | Continuous casting method and method for continuously casting stainless steel |
| JPH04327348A (en) * | 1991-04-30 | 1992-11-16 | Kawasaki Steel Corp | Tundish having coil device for generating shifting magnetic field |
| CN105215306A (en) * | 2015-10-28 | 2016-01-06 | 东北大学 | A kind of aluminum alloy semi-continuous casting device and method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04134074U (en) * | 1991-06-04 | 1992-12-14 | 東洋通信機株式会社 | adapter |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55107743A (en) * | 1979-01-08 | 1980-08-19 | Nippon Steel Corp | Removing method for inclusion in molten metal |
| JPS5822317A (en) * | 1981-07-29 | 1983-02-09 | Godo Seitetsu Kk | Eliminating process for nonmetallic inclusions in molten steel |
-
1985
- 1985-12-06 JP JP27350785A patent/JPS62134150A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55107743A (en) * | 1979-01-08 | 1980-08-19 | Nippon Steel Corp | Removing method for inclusion in molten metal |
| JPS5822317A (en) * | 1981-07-29 | 1983-02-09 | Godo Seitetsu Kk | Eliminating process for nonmetallic inclusions in molten steel |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0379513A1 (en) * | 1987-08-19 | 1990-08-01 | Massachusetts Institute Of Technology | Magnetic streamlining and flow control in tundishes |
| JPH02299751A (en) * | 1989-05-12 | 1990-12-12 | Kawasaki Steel Corp | Method for separating non-metallic inclusion in molten metal |
| JPH04187352A (en) * | 1990-11-19 | 1992-07-06 | Kawasaki Steel Corp | Continuous casting method and method for continuously casting stainless steel |
| JPH04327348A (en) * | 1991-04-30 | 1992-11-16 | Kawasaki Steel Corp | Tundish having coil device for generating shifting magnetic field |
| CN105215306A (en) * | 2015-10-28 | 2016-01-06 | 东北大学 | A kind of aluminum alloy semi-continuous casting device and method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0212665B2 (en) | 1990-03-23 |
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