JPH0346216B2 - - Google Patents
Info
- Publication number
- JPH0346216B2 JPH0346216B2 JP13811886A JP13811886A JPH0346216B2 JP H0346216 B2 JPH0346216 B2 JP H0346216B2 JP 13811886 A JP13811886 A JP 13811886A JP 13811886 A JP13811886 A JP 13811886A JP H0346216 B2 JPH0346216 B2 JP H0346216B2
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- pouring
- molten metal
- side wall
- mold
- 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
- 229910052751 metal Inorganic materials 0.000 claims description 42
- 239000002184 metal Substances 0.000 claims description 42
- 238000009749 continuous casting Methods 0.000 claims description 10
- 238000005266 casting Methods 0.000 description 10
- 239000000843 powder Substances 0.000 description 7
- 230000007547 defect Effects 0.000 description 6
- 238000007664 blowing Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000000155 melt Substances 0.000 description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000655 Killed steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- RQMIWLMVTCKXAQ-UHFFFAOYSA-N [AlH3].[C] Chemical compound [AlH3].[C] RQMIWLMVTCKXAQ-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 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
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、連続鋳造の溶融金属注湯用ノズルに
関するものであり、特に高速鋳造時の湯面の変動
やモールドパウダーの巻き込みを防止し得る溶融
金属注湯用ノズルに関するものである。Detailed Description of the Invention (Industrial Application Field) The present invention relates to a nozzle for pouring molten metal in continuous casting, and is particularly capable of preventing fluctuations in the molten metal level and entrainment of mold powder during high-speed casting. This invention relates to a nozzle for pouring molten metal.
（従来の技術）
連続鋳造に用いられる溶融金属注湯用ノズルに
要求される機能としては、連続鋳造鋳型に溶融金
属を一定速度で安定して供給する機能に加えて製
品欠陥の原因となる非金属介在物の分離浮上とい
う機能が要求されている。これらの機能を満足さ
せるために、鋳型の寸法、鋳造速度等の条件によ
り溶融金属注湯ノズルの注湯口の形状を丸型、縦
楕円型或いは横楕円型にしたり、注湯口の角度を
水平、下向き或いは上向きにするなど、設計上工
夫がされている。(Prior art) The functions required of a molten metal pouring nozzle used in continuous casting are the function of stably supplying molten metal to the continuous casting mold at a constant rate, and the function of stably supplying molten metal to the continuous casting mold. The ability to separate and float metal inclusions is required. In order to satisfy these functions, the shape of the pouring port of the molten metal pouring nozzle may be made round, vertically elliptical, or horizontally oval depending on conditions such as mold dimensions and casting speed, and the angle of the pouring port may be set horizontally or The design has been devised, such as facing downwards or upwards.
しかし、何れの溶融金属注湯ノズルも連続鋳造
用鋳型の短辺壁に対向する位置のみに注湯口が設
けられているのが一般的である（第40・41回西山
講座「鋼の連続鋳造技術における最近の進歩」
p197）。 However, it is common for all molten metal pouring nozzles to have a pouring port only at a position facing the short side wall of the continuous casting mold (40th and 41st Nishiyama Lectures ``Continuous Casting of Steel'') Recent advances in technology
p197).
（発明が解決しようとする問題点）
この様に連続鋳造用鋳型内に配置された溶融金
属注湯ノズルの注湯口からの溶融金属の流れを、
下向き・縦楕円の注湯口を有する溶融金属注湯ノ
ズルの場合を例にとり、第１図に模式的に示す。(Problems to be Solved by the Invention) In this way, the flow of molten metal from the spout of the molten metal pouring nozzle arranged in the continuous casting mold is
An example of a molten metal pouring nozzle having a downwardly directed, vertically elliptical pouring spout is schematically shown in FIG.
まず、溶融金属注湯ノズルの供給通路Ａを通つ
て注湯口２より吐出した溶融金属は鋳型の短辺壁
に当り、上昇流と下降流に分岐する。上記上昇流
は、鋳型の短辺壁面に沿つて上昇し、湯面に到達
した後、溶融金属注湯用ノズルの注湯口に向けて
流れ、再び吐出流と合流する。一方、下降流の大
部分は、鋳型の短辺壁面に衝突後、撥ね返り下降
するが、下降流れの一部は反転し、溶融金属注湯
用ノズル下方より上昇し、吐出流と合流する。 First, the molten metal discharged from the pouring port 2 through the supply passage A of the molten metal pouring nozzle hits the short side wall of the mold and branches into an upward flow and a downward flow. The above-mentioned upward flow rises along the short side wall surface of the mold, and after reaching the molten metal surface, flows toward the pouring port of the molten metal pouring nozzle, and merges with the discharge flow again. On the other hand, most of the downward flow rebounds and descends after colliding with the short side walls of the mold, but a portion of the downward flow reverses, rises from below the molten metal pouring nozzle, and merges with the discharge flow.
この様な現象を呈する溶融金属注湯用ノズルを
用いて、生産性を上げるために鋳造速度を増加さ
せると、溶融金属の上昇流の流速が速くなり湯面
変動が激しくなつたり、モールドパウダーの巻き
込みが増加し、鋳片性状の悪化や介在物による製
品欠陥が増加するという問題が生じる。 If you use a molten metal pouring nozzle that exhibits this phenomenon and increase the casting speed to increase productivity, the upward flow of molten metal will increase in velocity, resulting in drastic fluctuations in the level of the mold powder and This increases entrainment, resulting in problems such as deterioration of slab properties and increased product defects due to inclusions.
本発明の目的は、高速鋳造時でも連続鋳造用鋳
型内の上昇流の流速の増加を抑え、湯の変動やモ
ールドパウダーの巻き込みによる鋳片の性状の悪
化及び介在物による製品欠陥を防止することにあ
る。 The purpose of the present invention is to suppress the increase in the flow rate of upward flow in a continuous casting mold even during high-speed casting, and to prevent deterioration of the properties of slabs due to fluctuations in hot water and entrainment of mold powder, and product defects due to inclusions. It is in.
（問題点を解決するための手段）
上述した問題点を解決するために、本発明は、
ノズル本体の側壁に、連続鋳造用鋳型の短辺壁に
向けてそれぞれ開口する注湯口を備える溶融金属
注湯用ノズルにおいて、上記溶融金属注湯用ノズ
ルのノズル本体先端部に、鋳型の一方の短辺壁側
から他方の短辺壁側に向けてノズル本体をその径
方向に分断するとともに、一端を溶融金属の供給
通路へつながる各注湯口へ連通し、他端をノズル
本体先端に開口してなるスリツトを設けたことを
特徴とする溶融金属注湯用ノズル、にするとこで
前述した問題点を解決した。(Means for solving the problems) In order to solve the above-mentioned problems, the present invention
In a molten metal pouring nozzle that is equipped with a pouring port that opens toward the short side wall of a continuous casting mold on the side wall of the nozzle body, the tip of the nozzle body of the molten metal pouring nozzle has one side of the mold. The nozzle body is divided in the radial direction from one short side wall side to the other short side wall side, one end is communicated with each pouring port connected to the molten metal supply passage, and the other end is opened at the tip of the nozzle body. The above-mentioned problems have been solved by creating a nozzle for pouring molten metal, which is characterized by having a slit of 200 mm.
更に、鋳込み中に前記スリツトが閉塞しないよ
うに、ガス吹込口を設けておくと効果的である。 Furthermore, it is effective to provide a gas inlet to prevent the slit from being blocked during casting.
第２ａ図及至第４ｂ図に基き、本発明の具体例
について述べる。 A specific example of the present invention will be described based on FIGS. 2a to 4b.
第２ａ図、第２ｂ図は本発明に従う溶融金属注
湯用ノズルの一例を示したものであり、このノズ
ルには、ノズル本体１ａの先端部に、一端を溶融
金属の供給通路Ａにつながる各注湯口２ａ，２ｂ
へ連通し、他端をノズル先端に開口して該ノズル
本体先端部を鋳型の一方の短辺壁側から他方の短
辺壁側に向けてその径方向に分断する狭幅のスリ
ツト５を設けてあり、このスリツト５により均一
な下降流を確保でき、注湯流量を増大させた場合
でも上昇流の流速が増大するのを極力回避するこ
とができる。 Figures 2a and 2b show an example of a molten metal pouring nozzle according to the present invention. Pouring spout 2a, 2b
A narrow slit 5 is provided that communicates with the nozzle body and opens the other end at the nozzle tip to divide the nozzle body tip in the radial direction from one short side wall side of the mold to the other short side wall side. This slit 5 makes it possible to ensure a uniform downward flow, and even when the pouring flow rate is increased, an increase in the flow velocity of the upward flow can be avoided as much as possible.
また、上記の溶融金属注湯用ノズルでも湯面の
変動が大きい場合若しくはモールドパウダーの巻
き込み量が多い場合、第３ａ図及び第３ｂ図に示
すようにノズルの内径を下部で広げた溶融金属注
湯用ノズルを適用して溶湯流を減速することもで
きる。この溶融金属注湯用ノズルもその先端部に
スリツト５を設け、このスリツト５により均一な
下降流を確保することによつて上昇流の流速が増
大するのを防止することができる。 In addition, even with the above-mentioned molten metal pouring nozzle, if there are large fluctuations in the molten metal level or a large amount of mold powder is involved, it is possible to use the molten metal pouring nozzle by expanding the inner diameter of the nozzle at the bottom as shown in Figures 3a and 3b. A hot water nozzle can also be applied to slow down the melt flow. This nozzle for pouring molten metal also has a slit 5 at its tip, and by ensuring a uniform downward flow, it is possible to prevent the flow velocity of the upward flow from increasing.
更に、第４ａ図及び第４ｂ図に示す溶融金属注
湯用ノズルは、第２ａ図及び第２ｂ図に示した溶
融金属注湯用ノズルにガス吹込み用プラグ６を設
けたノズルであり、溶融金属注湯用ノズル内にガ
スを吹き込みつつ鋳込むとスリツト５が閉塞する
ことがなくなる。 Furthermore, the molten metal pouring nozzle shown in FIGS. 4a and 4b is a nozzle in which a gas blowing plug 6 is provided in the molten metal pouring nozzle shown in FIGS. 2a and 2b, and the molten metal pouring nozzle shown in FIGS. By blowing gas into the metal pouring nozzle while pouring, the slit 5 will not be clogged.
第２ａ図及び第２ｂ図に示した溶融金属注湯用
ノズルと第３ａ図及び第３ｂ図に示した溶融金属
注湯用ノズルのスリツトの幅は５mm以上にすると
有効であり、この幅が５mm未満であると鋳込み中
にAl2O3等の付着物でスリツトが閉塞する危険性
がある。なお、ガス吹込み用プラグを設ける場合
は、スリツトの幅を５mm以下にできる。 It is effective to set the slit width of the molten metal pouring nozzle shown in Figures 2a and 2b and the molten metal pouring nozzle shown in Figures 3a and 3b to 5 mm or more; If it is less than that, there is a risk that the slit will be clogged with deposits such as Al 2 O 3 during casting. Note that when a gas blowing plug is provided, the width of the slit can be 5 mm or less.
（実施例）
連続鋳造装置の高速鋳込み用注湯ノズルとし
て、ノズルの内径を60mm、ノズルの注湯口の形状
を縦楕円（60×80mm）、注湯口の角度を下向に15
度とし、注湯用ノズルの下部にスリツトを設けな
い従来型の注湯用ノズル（No.１ノズルという）、
第２ａ図及び第２ｂ図にすタイプの注湯ノズルで
ノズル先端部に幅３mmのスリツトを設けた注湯用
ノズル（No.２ノズルという）、同じく第２ａ図及
び第２ｂ図に示す注湯用ノズルでノズル先端部に
幅10mmのスリツトを設けた注湯ノズル（No.３ノズ
ルという）、第３ａ図及び第３ｂ図に示す注湯用
ノズルで、ノズルの先端部におけるノズルの形状
を60×120mmの楕円型とし、更に幅10mmのスリツ
トを設けた注湯ノズル（No.４ノズルという）、第
４ａ図及び第４ｂ図に示す注湯ノズルでガス吹込
みプラグを設け、ノズルの先端部に幅３mmのスリ
ツトを設けた注湯ノズル（No.５ノズルという）を
それぞれ製作した。(Example) As a pouring nozzle for high-speed pouring of a continuous casting device, the inner diameter of the nozzle is 60 mm, the shape of the nozzle pouring port is a vertical ellipse (60 x 80 mm), and the angle of the pouring port is 15 mm downward.
A conventional pouring nozzle (referred to as No. 1 nozzle) with a slit at the bottom of the pouring nozzle.
A pouring nozzle of the type shown in Figures 2a and 2b with a 3 mm wide slit at the nozzle tip (referred to as No. 2 nozzle), also shown in Figures 2a and 2b. A pouring nozzle with a slit of 10 mm width at the tip of the nozzle (referred to as No. 3 nozzle) is a pouring nozzle shown in Figures 3a and 3b, and the shape of the nozzle at the tip of the nozzle is 60 mm. A pouring nozzle (referred to as No. 4 nozzle), which has an oval shape of 120 mm x 120 mm and a slit of 10 mm width (referred to as No. 4 nozzle), is equipped with a gas blowing plug as shown in Figures 4a and 4b, and the tip of the nozzle is A pouring nozzle (referred to as No. 5 nozzle) with a slit of 3 mm width was manufactured in each case.
製作した各注湯ノズル（No.１ノズル〜No.５ノズ
ル）を用いて、鋳型の短辺壁の幅が260mm、長辺
壁の幅が1900mmになる鋳型に740／minの鋳込
速度で低炭アルミキルド鋼の鋳込みを実施した。
この時の湯面変動量とモールドパウダーの巻き込
み等による介在物による製品欠陥を第５図及び第
６図に示す。 Using each manufactured pouring nozzle (No. 1 nozzle to No. 5 nozzle), pour into a mold with a width of 260 mm on the short side wall and 1900 mm on the long side wall at a casting speed of 740/min. Casting of low carbon aluminum killed steel was carried out.
Figures 5 and 6 show the amount of fluctuation in the melt level at this time and product defects due to inclusions caused by entrainment of mold powder.
本発明の注湯用ノズルに相当するNo.３ノズル乃
至No.５ノズルを使用した場合の湯面変動量は、従
来型の注湯ノズルに比べて約40〜70％減少し、介
在物に起因する製品欠陥も約60〜85％減少した。 When using the No. 3 nozzle to No. 5 nozzle, which corresponds to the pouring nozzle of the present invention, the amount of fluctuation in the melt level is reduced by about 40 to 70% compared to the conventional pouring nozzle. The resulting product defects were also reduced by approximately 60-85%.
なお、比較のために使用した注湯ノズル（No.２
ノズル）は、ノズル内の先端部にAl2O3等の付着
物が堆積しスリツトの閉塞が生じ、従来型の注湯
ノズルと同じ結果となつた。 In addition, the pouring nozzle (No. 2) used for comparison
(Nozzle), deposits such as Al 2 O 3 were deposited at the tip of the nozzle, causing the slit to become clogged, resulting in the same results as with conventional pouring nozzles.
（発明の効果）
以上説明したように本発明によれば、高速鋳造
時においても、湯面変動が減少しレベル制御が容
易になる。また、モードパウダーの巻き込みによ
る製品欠陥も大幅に減少する。(Effects of the Invention) As described above, according to the present invention, even during high-speed casting, fluctuations in the molten metal level are reduced and level control becomes easy. In addition, product defects due to mode powder entrainment are greatly reduced.
第１図は、鋳型内での溶融金属の流れを示す模
式図、第２ａ図及び第２ｂ図は本発明の注湯ノズ
ルを示す図、第３ａ図及び第３ｂ図は本発明の注
湯ノズルの他の態様を示す図、第４ａ図及び第４
ｂ図はガス吹込みプラグを設けた本発明の注湯ノ
ズルを示す図、第５図は、各種構造の注湯ノズル
の湯面変動量を示す図、第６は、各種構造になる
注湯ノズルの介在物に起因する製品欠陥指数を示
す図、第７図は本発明の注湯ノズルの斜視図であ
る。
１……注湯ノズル、１ａ……ノズル本体、２，
２ａ，２ｂ……注湯口、３……モールドパウダ
ー、４……短辺壁、５……スリツト、６……ガス
吹入口、Ａ……供給通路。
Figure 1 is a schematic diagram showing the flow of molten metal in the mold, Figures 2a and 2b are diagrams showing the pouring nozzle of the present invention, and Figures 3a and 3b are the pouring nozzles of the present invention. Figures 4a and 4 showing other aspects of
Figure b is a diagram showing the pouring nozzle of the present invention equipped with a gas blowing plug, Figure 5 is a diagram showing the amount of fluctuation in the melt level of pouring nozzles with various structures, and Figure 6 is a diagram showing pouring nozzles with various structures. FIG. 7 is a perspective view of the pouring nozzle of the present invention, which shows the product defect index caused by inclusions in the nozzle. 1...Pouring nozzle, 1a...Nozzle body, 2,
2a, 2b...pouring port, 3...mold powder, 4...short side wall, 5...slit, 6...gas inlet, A...supply passage.
Claims (1)
壁に向けてそれぞれ開口する注湯口を備える溶融
金属注湯用ノズルにおいて、 上記溶融金属注湯用ノズルのノズル本体先端部
に、鋳型の一方の短辺壁側から他方の短辺壁側に
向けてノズル本体をその径方向に分断するととも
に、一端を溶融金属の供給通路へつながる各注湯
口へ連通し、他端をノズル本体先端に開口してな
るスリツトを設けたことを特徴とする溶融金属注
湯用ノズル。 ２ ノズル本体にノズル閉塞を防止するガス吹込
口を有する特許請求の範囲第１項記載の溶融金属
注湯用ノズル。[Scope of Claims] 1. A molten metal pouring nozzle comprising pouring ports each opening toward the short side wall of a continuous casting mold on a side wall of the nozzle body, wherein the tip of the nozzle body of the molten metal pouring nozzle described above At the same time, the nozzle body is divided in the radial direction from one short side wall side of the mold to the other short side wall side, and one end is connected to each pouring port connected to the molten metal supply passage, and the other end is connected to each pouring port connected to the molten metal supply passage. A nozzle for pouring molten metal, characterized in that a slit is provided at the tip of the nozzle body. 2. A nozzle for pouring molten metal according to claim 1, which has a gas inlet in the nozzle body to prevent nozzle clogging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13811886A JPS62296944A (en) | 1986-06-16 | 1986-06-16 | Nozzle for pouring molten metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13811886A JPS62296944A (en) | 1986-06-16 | 1986-06-16 | Nozzle for pouring molten metal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62296944A JPS62296944A (en) | 1987-12-24 |
| JPH0346216B2 true JPH0346216B2 (en) | 1991-07-15 |
Family
ID=15214383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13811886A Granted JPS62296944A (en) | 1986-06-16 | 1986-06-16 | Nozzle for pouring molten metal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62296944A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2778455B2 (en) * | 1993-10-13 | 1998-07-23 | 日本鋼管株式会社 | Immersion nozzle for continuous casting |
| JP4209976B2 (en) * | 1998-10-22 | 2009-01-14 | 新日本製鐵株式会社 | Dipping nozzle for continuous casting and method for continuous casting of steel |
| JP4543562B2 (en) * | 2001-02-20 | 2010-09-15 | Ｊｆｅスチール株式会社 | Continuous casting method for molten steel |
| GB0610809D0 (en) † | 2006-06-01 | 2006-07-12 | Foseco Int | Casting nozzle |
-
1986
- 1986-06-16 JP JP13811886A patent/JPS62296944A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62296944A (en) | 1987-12-24 |
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