JPH0119995B2 - - Google Patents
Info
- Publication number
- JPH0119995B2 JPH0119995B2 JP58000416A JP41683A JPH0119995B2 JP H0119995 B2 JPH0119995 B2 JP H0119995B2 JP 58000416 A JP58000416 A JP 58000416A JP 41683 A JP41683 A JP 41683A JP H0119995 B2 JPH0119995 B2 JP H0119995B2
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- ladle
- molten metal
- ladle nozzle
- passage
- 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
- 239000002184 metal Substances 0.000 claims description 30
- 239000011819 refractory material Substances 0.000 claims description 22
- 239000011261 inert gas Substances 0.000 claims description 10
- 239000000945 filler Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 238000002347 injection Methods 0.000 description 10
- 239000007924 injection Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 7
- 238000007796 conventional method Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000009848 ladle injection Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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
Description
【発明の詳細な説明】
この発明は、取鍋内の溶鋼を、その底部に設け
た取鍋ノズルおよびこれに係合するロングノズル
を介してタンデイシユ内へ無酸化注入する際の取
鍋ノズルの開孔方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for injecting molten steel in a ladle into a tundish without oxidation through a ladle nozzle provided at the bottom of the ladle and a long nozzle that engages with the ladle nozzle. The present invention relates to a hole-opening method.
第１図に取鍋からタンデイシユに至る溶融金属
の注入通路を模式的に示す。従来、ロングノズル
４を用いて取鍋１からタンデイシユ８（第２図参
照）へ溶融を無酸化注入する場合、取鍋ノズルの
下取鍋ノズル３をロングノズル４とともにスライ
ドさせ、その通路を上取鍋ノズル３′の通路に連
通させることによつて上記上取鍋ノズル３′に予
め充てんしてある詰め物耐火材２をタンデイシユ
８の溶湯浴面に落下させ溶湯の注入を行つてい
た。ところでこのような要領で取鍋ノズルを開孔
して溶湯の注入を行うと、第２図に示すように、
上取鍋ノズル３′から落下した詰め物耐火材２が
ロングノズル４内の溶湯浴面上に残留し、これが
ロングノズル４の通路を閉塞することがあり、こ
のとき、ロングノズル４と下取鍋ノズル３との係
合部における押し付け力が弱いとその隙間から溶
湯が噴出し、注湯作業に著しい支障を来すことが
あつた。一般には、ロングノズル４は支持アーム
５上に設置されていて、支持アーム５は通常エア
ーシリンダ６によつて上方に押し付けられてい
る。この際の押し付け力は、エアーシリンダ６の
大きさによるが、関連装置との釣り合いから規制
されている。押し付け力が余り強過ぎると取鍋ノ
ズル摺動用シリンダ７またはモータの負荷が大き
くなり問題となる。そのため、ロングノズル４内
で詰め物耐火材２が詰まるのを防ぐため、：第
３図に示すようにロングノズル４をタンデイツシ
ユ８内の溶湯面上に引き上げた状態で取鍋ノズル
を開孔し、詰め物耐火材２をロングノズル４外に
排出していた。このため、注入流は一時的に大気
にさらされ、所謂るオープン注入となる。また先
にノズル外に排出された詰め物耐火材は後継注入
流によつて、溶湯中に非金属介在物として押し込
まれる。 FIG. 1 schematically shows the injection path for molten metal from the ladle to the tundish. Conventionally, when using the long nozzle 4 to inject melt from the ladle 1 into the tundish 8 (see Figure 2) without oxidation, the lower ladle nozzle 3 of the ladle nozzle is slid together with the long nozzle 4, and the passage is upwardly moved. By communicating with the passage of the ladle nozzle 3', the filler refractory material 2 previously filled in the upper ladle nozzle 3' is dropped onto the molten metal bath surface of the tundish 8, thereby injecting the molten metal. By the way, when the ladle nozzle is opened in this way and molten metal is injected, as shown in Figure 2,
The filler refractory material 2 that has fallen from the upper ladle nozzle 3' remains on the molten metal bath surface in the long nozzle 4, and this may block the passage of the long nozzle 4. In this case, the long nozzle 4 and the lower ladle If the pressing force at the engagement portion with the nozzle 3 was weak, molten metal would spurt out from the gap, causing a significant hindrance to pouring work. Generally, the long nozzle 4 is installed on a support arm 5, which is usually pressed upward by an air cylinder 6. The pressing force at this time depends on the size of the air cylinder 6, but is regulated based on balance with related devices. If the pressing force is too strong, the load on the ladle nozzle sliding cylinder 7 or the motor will increase, causing a problem. Therefore, in order to prevent the filling refractory material 2 from clogging in the long nozzle 4, as shown in FIG. The filling refractory material 2 was being discharged to the outside of the long nozzle 4. Therefore, the injection stream is temporarily exposed to the atmosphere, resulting in so-called open injection. Further, the filler refractory material previously discharged outside the nozzle is forced into the molten metal as a nonmetallic inclusion by the subsequent injection flow.
このような一時的なオープン注入を避けるため
には、：第４図・第５図に示すような、下部の
内容積を大きくしたロングノズル７′，７″を用い
ることによつても、解決できるが、この場合でも
詰め物耐火材が後続注入流によつて溶湯中に押し
込まれるのは（）の場合と同じである。そのた
め、従来は、取鍋交換時の溶湯中の介在物は、第
８図のように一時的に増加し、品質上にも問題が
あり、これらの欠点・問題点を解消できる取鍋ノ
ズルの開孔法の提案が要望されていた。 In order to avoid such temporary open injection, it is also possible to solve the problem by using long nozzles 7' and 7'' with a larger internal volume at the bottom, as shown in Figures 4 and 5. However, even in this case, the filling refractory material is pushed into the molten metal by the subsequent injection flow, just as in the case of ().Therefore, conventionally, inclusions in the molten metal when changing the ladle are As shown in Figure 8, there is a temporary increase in the number of holes and there are problems with quality, and there has been a demand for a proposal for a method of opening holes in a ladle nozzle that can eliminate these drawbacks and problems.
ロングノズルを使用して取鍋からタンデイシユ
に溶融金属を注入する場合に、取鍋ノズルの開孔
に際して落下させた詰め物耐火材に起因したノズ
ル閉塞や溶湯の汚染を有利に回避できる取鍋ノズ
ルの開孔方法を提案することがこの発明の目的で
ある。 When pouring molten metal from a ladle into a tundish using a long nozzle, a ladle nozzle that advantageously avoids nozzle clogging and contamination of the molten metal caused by filler refractory material dropped when opening the ladle nozzle. It is an object of this invention to propose a hole drilling method.
取鍋ノズルの開孔に当たり、ロングノズルの先
端に残留、蓄積する詰め物耐火材を該ロングノズ
ルの外部に排出し併せて溶湯浴面上に容易に浮上
させるべく種々実験と検討を重ねた結果、取鍋ノ
ズルの開孔の際に下取鍋ノズル又はロングノズル
の通路壁からそれらの通路内に不活性ガスを吹き
込むことが極めて有効であることを見い出した。 As a result of various experiments and studies, in order to discharge the filler refractory material that remains and accumulates at the tip of the long nozzle to the outside of the long nozzle when opening the ladle nozzle, and also to easily float it to the surface of the molten metal bath. It has been found that it is extremely effective to blow an inert gas into the passages of the lower ladle nozzle or the long nozzle from the passage wall when opening the ladle nozzle.
この発明は上記の知見に立脚するものである。 This invention is based on the above knowledge.
すなわちこの発明は取鍋の底部と連通する上取
鍋ノズルの通路内に予め詰め物耐火材を充填して
おき、この上取鍋ノズルの通路を、該上取鍋ノズ
ルの下端に接し、先端をタンデイシユの溶湯内に
浸漬したロングノズルとともにスライド可能な下
取鍋ノズルの通路に連通させることにより、該耐
火材をタンデイシユの溶湯浴面に向けて落下させ
取鍋ノズルを開孔するにあたり、
上取鍋ノズルの通路を下取鍋ノズルの通路に連
通させるに先立ち、
下取鍋ノズルまたはロングノズルの通路壁から
不活性ガスを吹き込み、この不活性ガスの吹き込
み下に詰め物耐火材を落下させてロングノズルの
先端よりタンデイシユ内へ該耐火材を排出するこ
とを特徴とする取鍋ノズルの開孔方法である。 That is, in this invention, the passage of the upper ladle nozzle that communicates with the bottom of the ladle is filled with a refractory material in advance, and the passage of the upper ladle nozzle is brought into contact with the lower end of the upper ladle nozzle, and the tip is connected to the lower end of the upper ladle nozzle. By connecting the long nozzle immersed in the molten metal of the tundish with the passage of the lower ladle nozzle that can slide, the refractory material is dropped toward the molten metal bath surface of the tundish and the ladle nozzle is opened. Before connecting the passage of the ladle nozzle to the passage of the lower ladle nozzle, inert gas is blown from the passage wall of the lower ladle nozzle or long nozzle, and the refractory material is dropped under the inert gas injection to form the long nozzle. This method of opening a ladle nozzle is characterized by discharging the refractory material into a tundish from the tip of the nozzle.
第６図および７図に、下取鍋ノズル３および上
取鍋ノズル３′よりなる取鍋ノズルとこれに係合
するロングノズル４の横断面を模式的に示す。こ
の発明に従い取鍋ノズルを開孔するには、まず第
６図に示すように下取鍋ノズル３の通路を上取鍋
ノズル３′の通路に連通させるに先立ち下取鍋ノ
ズル３またはロングノズル４の適当な位置からこ
れらのノズルの通路内不活性ガスを吹き込む。 6 and 7 schematically show a cross section of a ladle nozzle consisting of a lower ladle nozzle 3 and an upper ladle nozzle 3', and a long nozzle 4 that engages with the ladle nozzle. In order to open a hole in the ladle nozzle according to the present invention, first, as shown in FIG. Inert gas is blown into the passages of these nozzles from appropriate positions in step 4.
次いで第７図に示すように不活性ガスを吹き込
んだ状態で下取鍋ノズル３をロングノズル４とと
もにスライドさせ、これらノズルの通路を上取鍋
ノズル３′の通路に連通させる。 Next, as shown in FIG. 7, the lower ladle nozzle 3 is slid together with the long nozzle 4 while inert gas is blown into it, and the passages of these nozzles are communicated with the passage of the upper ladle nozzle 3'.
ここに取鍋ノズルの開孔状況をより詳細に説明
すると、上取鍋ノズル３′の詰め物耐火材２は一
般に砂粒状でありその上部には凝固殻が形成され
ているので、まず耐火材２はその下部から、徐々
にタンデイシユ８の溶湯面に向けて落下する。こ
の際、下取鍋ノズル３、ロングノズル４の通路内
には、不活性ガスが吹きこまれているので上記の
耐火材２はロングノズル４の先端からタンデイシ
ユ８内の溶湯中に速やかに押し出され、さらに不
活性ガスのバブルによつて溶湯浴面へ浮上する。
このため耐火材２の落下に引き続き溶湯の注入が
開始されても、ロングノズル４の先端の溶湯浴面
には耐火材２が残留することがないので注入流に
よつて、耐火材２がタンデイシユ溶湯内に深く押
し込まれることもない。 To explain in more detail how the ladle nozzle is opened, the filling refractory material 2 of the upper ladle nozzle 3' is generally in the shape of sand grains, and a solidified shell is formed on its upper part. gradually falls from the bottom toward the molten metal surface of the tundish 8. At this time, since inert gas is blown into the passages of the lower ladle nozzle 3 and the long nozzle 4, the above-mentioned refractory material 2 is quickly pushed out from the tip of the long nozzle 4 into the molten metal in the tundish 8. The molten metal floats to the surface of the molten bath due to inert gas bubbles.
Therefore, even if the injection of molten metal starts after the refractory material 2 falls, the refractory material 2 will not remain on the molten metal bath surface at the tip of the long nozzle 4, so the refractory material 2 will be transferred to the tundish by the injection flow. It is not pushed deeply into the molten metal.
なお不活性ガスを吹き込むに当たつては、不取
鍋ノズル３またはロングノズル４の通路壁にポー
ラス質れんがを埋め込むか、または細孔を設けこ
こからガスを吹き込むのがよい。 Note that when blowing inert gas, it is preferable to embed porous bricks in the passage wall of the ladle nozzle 3 or long nozzle 4, or to provide pores and blow the gas therethrough.
ガスの吹込流量は多い方が詰め物耐火材２のノ
ズル外への押し出しと、浮上促進に有利である。 A larger flow rate of gas is advantageous in pushing out the refractory filler 2 out of the nozzle and promoting floating.
第８図に、この発明に従つて溶湯を注入した際
の溶湯中介在物の推移状況の調査結果を下記の要
領で溶湯を注入した場合の結果と併せて示す。 FIG. 8 shows the results of an investigation of the transition of inclusions in the molten metal when the molten metal was injected according to the present invention, together with the results when the molten metal was injected in the following manner.
従来法：第３図に示すように取鍋注入開始時、
ロングノズルをタンデイシユ溶湯面上に上げて
取鍋ノズルを開孔する。Conventional method: As shown in Figure 3, at the start of ladle injection,
Raise the long nozzle above the molten metal surface of the tundish and drill the ladle nozzle.
従来法：第４図・第５図に示すようにロングノ
ズル下部の内容積を大きくしたロングノズルを
用いてロングノズルをタンデイシユ内溶湯面下
に浸漬させて、取鍋ノズルを開孔する。Conventional method: As shown in FIGS. 4 and 5, a long nozzle with a large internal volume at the bottom of the long nozzle is immersed below the surface of the molten metal in a tundish, and a ladle nozzle is opened.
この発明によれば取鍋ノズルを開孔するときロ
ングノズルの先端に耐火材が残留し閉塞栓を形成
することがないので、ノズル係合部からの溶湯の
噴出を有利に防止でき、また耐火材がタンデイシ
ユ溶湯内へ深く押し込まれることもないので、溶
湯中の介在物の増加を極力抑制できる。 According to this invention, when the ladle nozzle is opened, the refractory material will not remain at the tip of the long nozzle and will not form a blockage plug. Since the material is not pushed deeply into the tundish molten metal, the increase in inclusions in the molten metal can be suppressed as much as possible.
第１図は取鍋ノズルおよびロングノズルの配設
関係の説明図、第２図は従来方法による場合の漏
湯事故の説明図、第３図はオープン注入の説明
図、第４図・第５図は改良型のロングノズルの説
明図、第６図・第７図は本発明実施例で第６図は
開孔前第７図は開孔直後の状態を示す模式図、第
８図は取鍋交換時における本発明方法と従来法と
の介在物の推移を示したグラフである。
１……取鍋、２……詰め物耐火材、３′……上
取鍋ノズル、３……下取鍋ノズル、４……ロング
ノズル、５……支持アーム、６……ロングノズル
押付け用シリンダ、７……摺動用駆動源、８……
タンデイツシユ、９……溶融金属。
Figure 1 is an explanatory diagram of the arrangement relationship of the ladle nozzle and long nozzle, Figure 2 is an explanatory diagram of a leakage accident in the case of the conventional method, Figure 3 is an explanatory diagram of open injection, and Figures 4 and 5. The figure is an explanatory diagram of the improved long nozzle, Figures 6 and 7 are examples of the present invention, Figure 6 is a schematic diagram showing the state before the hole is opened, Figure 7 is a schematic diagram showing the state immediately after the hole is opened, and Figure 8 is a schematic diagram showing the state immediately after the hole is opened. It is a graph showing the transition of inclusions between the method of the present invention and the conventional method when replacing the pot. 1... Ladle, 2... Filling refractory material, 3'... Upper ladle nozzle, 3... Lower ladle nozzle, 4... Long nozzle, 5... Support arm, 6... Long nozzle pressing cylinder , 7...Sliding drive source, 8...
9. Molten metal.
Claims (1)
に予め詰め物耐火材を充填しておき、この上取鍋
ノズルの通路を、該上取鍋ノズルの下端に接し、
先端をタンデイシユの溶湯内に浸漬したロングノ
ズルとともにスライド可能な下取鍋ノズルの通路
に連通させることにより、該耐火材をタンデイシ
ユの溶湯浴面に向けて落下させ取鍋ノズルを開孔
するにあたり、 上取鍋ノズルの通路を下取鍋ノズルの通路に連
通させるに先立ち、 下取鍋ノズルまたはロングノズルの通路壁から
不活性ガスを吹き込み、この不活性ガスの吹き込
み下に詰め物耐火材を落下させてロングノズルの
先端よりタンデイシユ内へ該耐火材を排出するこ
とを特徴とする取鍋ノズルの開孔方法。[Scope of Claims] 1. The passage of the upper ladle nozzle that communicates with the bottom of the ladle is filled with a refractory filler in advance, and the passage of the upper ladle nozzle is brought into contact with the lower end of the upper ladle nozzle. ,
By communicating the tip with the passage of the lower ladle nozzle which can slide together with the long nozzle immersed in the molten metal of the tundish, the refractory material is dropped toward the molten metal bath surface of the tundish and the ladle nozzle is opened. Before communicating the passage of the upper ladle nozzle with the passage of the lower ladle nozzle, inert gas is blown from the passage wall of the lower ladle nozzle or long nozzle, and the filling refractory material is dropped under the blown inert gas. A method for opening a ladle nozzle, characterized in that the refractory material is discharged into a tundish from the tip of a long nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP41683A JPS59125250A (en) | 1983-01-07 | 1983-01-07 | Hole opening method of long nozzle in continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP41683A JPS59125250A (en) | 1983-01-07 | 1983-01-07 | Hole opening method of long nozzle in continuous casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59125250A JPS59125250A (en) | 1984-07-19 |
| JPH0119995B2 true JPH0119995B2 (en) | 1989-04-13 |
Family
ID=11473190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP41683A Granted JPS59125250A (en) | 1983-01-07 | 1983-01-07 | Hole opening method of long nozzle in continuous casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59125250A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010050936A1 (en) * | 2010-11-11 | 2012-05-16 | Heraeus Electro-Nite International N.V. | Floor spout nozzle for placement in the bottom of a metallurgical vessel |
| BR112013033005B1 (en) * | 2012-06-29 | 2022-07-19 | Nippon Steel Corporation | CAST STEEL SUPPLY INITIATION METHOD |
| JP6892129B2 (en) * | 2018-10-16 | 2021-06-18 | 明智セラミックス株式会社 | Long nozzle for continuous casting |
| CN111299566B (en) * | 2020-04-16 | 2021-10-29 | 东北大学 | Tundish free-flow-injection long-nozzle structure and argon blowing smelting method |
| CN112170826A (en) * | 2020-08-21 | 2021-01-05 | 华北理工大学 | Steel ladle protective sleeve structure, continuous casting device and argon blowing pouring smelting method |
| CN112247136B (en) * | 2020-09-30 | 2021-08-03 | 东北大学 | Tundish short-distance jet flow long nozzle structure and argon blowing smelting method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55165273A (en) * | 1979-06-11 | 1980-12-23 | Nippon Steel Corp | Tapping start method of molten metal in vessel |
-
1983
- 1983-01-07 JP JP41683A patent/JPS59125250A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55165273A (en) * | 1979-06-11 | 1980-12-23 | Nippon Steel Corp | Tapping start method of molten metal in vessel |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59125250A (en) | 1984-07-19 |
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