JP4099257B2 - Lower nozzle for discharging molten metal - Google Patents

Lower nozzle for discharging molten metal Download PDF

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Publication number
JP4099257B2
JP4099257B2 JP03623798A JP3623798A JP4099257B2 JP 4099257 B2 JP4099257 B2 JP 4099257B2 JP 03623798 A JP03623798 A JP 03623798A JP 3623798 A JP3623798 A JP 3623798A JP 4099257 B2 JP4099257 B2 JP 4099257B2
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JP
Japan
Prior art keywords
molten metal
nozzle
nozzle body
discharging
mounting step
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 - Fee Related
Application number
JP03623798A
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Japanese (ja)
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JPH11226726A (en
Inventor
英明 加藤
清訓 原
整 瀧川
洋 山田
賢一 向山
恵子 岡田
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Krosaki Harima Corp
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Krosaki Harima Corp
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Filing date
Publication date
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Priority to JP03623798A priority Critical patent/JP4099257B2/en
Publication of JPH11226726A publication Critical patent/JPH11226726A/en
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Publication of JP4099257B2 publication Critical patent/JP4099257B2/en
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  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は溶融金属排出用下ノズルに係わり、特にノズルの亀裂を防止し耐久性を向上させた溶融金属排出用下ノズルに関する。
【0002】
【従来の技術】
溶融金属排出用下ノズルは、溶融金属排出装置、例えば取鍋内の溶融金属の排出量を調整するスライドゲート装置の下端部に取り付けられ、そのスライドゲート装置から排出される溶融金属の流動を制御する装置である。
【0003】
近年は溶融金属排出用下ノズル、例えば鉄鋼連続鋳造用下ノズルとしての連続鋳造用下ノズル31は、図4に示すように、耐火物製で中央部に溶鋼用流路32を有するノズル本体33にこのノズル本体33を囲繞する鉄皮34を有するものが用いられている。
【0004】
このノズル31を例えばスライドゲート装置に取り付けるため鉄皮34およびノズル本体33には取付段部35、36がそれぞれ設けられている。
【0005】
この鉄皮34に設けられた取付段部35はノズル本体33に設けられた段部36に対してノズル31の流出口37側(下側)に設けられている。
【0006】
【発明が解決しようとする課題】
このような構造のノズル31を取付具によりスライドゲート装置の下端部に取り付ける場合、鉄皮34に設けられた取付段部35を取付具によりスライドゲート装置方向に常時押圧してスライドゲート装置に取り付ける。従って、鉄皮34の取付段部35およびこの取付段部35近傍には常時押圧力F0が作用し、取付 段部35に対向してノズル本体34に設けられた段部36にも押圧力による応力が作用する。段部36に押圧力による応力が作用すると、形状的に熱応力に弱い段部36には、溶鋼による熱応力と押圧力による応力の相乗作用で段部36から亀裂Cが生じ、溶鋼が漏れることがあり、危険であった。
【0007】
本発明は上述した事情を考慮してなされたもので、安全でかつ耐久性の高い溶融金属排出用下ノズルを提供することを目的とする。
【0008】
【課題を解決するための手段】
上記目的を達成するためになされた本願請求項1の発明は、両端に溶融金属の流入口と流出口を有し、流入口から流出口にかけて貫通する溶融金属排出用流路を有する耐火物製のノズル本体と、このノズル本体を囲繞する耐熱性カバーとから構成される溶融金属排出用下ノズルにおいて、耐熱性カバーの外周に溶融金属排出用下ノズルを溶融金属排出装置に取付けるための取付段部を設け、かつ、この取付段部よりもノズルの流出口側に、少なくとも取付段部よりもノズルの流入口側に至るまでの間にわたってノズル本体の外周直径が増大変化し始める環状のネック部をノズル本体に形成したことを特徴とする溶融金属排出用下ノズルであることを要旨としている。
【0009】
本願請求項2の発明は、ノズル本体の環状のネック部が、環状のネック部より流出口側のノズル本体の外周と環状のネック部から流入口側のノズル本体の外周の傾斜の違いによる変曲点により形成したことを特徴とする請求項1に記載の溶融金属排出用下ノズルであることを要旨としている。
【0010】
本願請求項3の発明は、耐熱性カバーを鉄皮であり、取付段部がノズル本体の軸方向に対し垂直な方向の環状面を有するように形成されていることを特徴とする請求項2に記載の溶融金属排出用下ノズルであることを要旨としている。
【0011】
本願請求項4の発明は、取付段部の流出口側に、対応する部位のノズル本体の外周と同一のテーパを有するテーパ部を連接したことを特徴とする請求項1乃至請求項3のいずれかに記載の溶融金属排出用下ノズルであることを要旨としている。
【0012】
【発明の実施の形態】
以下、本発明に係わる溶融金属排出用ノズルの実施の形態および実施状況について添付図面に基づき説明する。
【0013】
図1に示されるような本発明に係わる溶融金属排出用下ノズル1は、耐火物製のノズル本体2とこのノズル本体2を囲繞する耐熱性カバー、例えば鉄皮3とから構成されている。
【0014】
ノズル本体2には中央部に軸方向に貫通して延びる溶融金属排出用流路4が設けられ、この溶融金属排出用流路4には流入口5と流出口6が設けられている。さらに、ノズル本体2は円筒状で、ノズル本体2の外周形状は直胴部7とこの直胴部7の端部を起点8とし、この起点8から先細になるようなテーパ部9を有し、このテーパ部9の終点、すなわち変曲点10aからさらに異なる勾配を有する本体主部11を有して先細の形状になっている。
【0015】
本体主部11の勾配はテーパ部9の勾配よりも小さく形成されおり、変曲点10aには凹状の環状のネック部10が形成される。なお、ここで本体主部11の勾配が0、すなわちネック部10から延伸する本体主部11は垂直線に沿い、外径寸法が同一の円筒状であってもよい。
【0016】
一方、鉄皮3はノズル本体2の直胴部7に平行な内壁面を有する直胴部12を有し、さらにこの直胴部12の端部にはノズル本体2のネック部10より入り口5側に位置して環状の取付段部13が設けられ、さらにこの取付段部13から延伸し勾配を有する鉄皮主部14が形成されている。なお、この鉄皮主部14も勾配を有さず、円筒状であってもよい。
【0017】
上述した取付段部13に対向するようにノズル本体2のテーパ部9が形成されており、起点8は取付段部13より流入口5側(上側)に位置するように、変曲点10、すなわちネック部10は取付段部13より流出口6側(下側)に離間距離Lを有して位置するように形成されている。なお、ノズル本体2と鉄皮3間に形成される空隙にはモルタル15が充填される。
【0018】
本発明に係わる溶融金属排出用下ノズル1は以上のような構造になっているから、図2に示されるように溶融金属排出装置、例えばスライドゲート装置20に組み込むには、スライドゲート装置20に回動自在に設けられた取付装置21の取付具22により、鉄皮3の取付段部13をスライドゲート装置20方向に押圧して行う。このとき、取付具22はスプリング23により常時スライドゲート装置20方向に押圧されており、取付具22により取付段部13は常時押圧されノズル1は確実にスライドゲート装置20に保持される。
【0019】
取付段部13が取付具22によって常時押圧されるがこの押圧力による応力は直接ノズル本体2のネック部10には作用しない。
【0020】
従って、このような状態でスライドゲート装置20を介して溶融金属排出用下ノズル1に溶融金属が流されても、ノズル本体2のネック部10には溶融金属による熱応力しか作用せず、ノズル本体2で形状上応力に対して最も弱いネック部10から亀裂を生じることがない。
【0021】
以上要するに本発明に係わる溶融金属排出用下ノズル1はノズル本体2に設けられたネック部10を鉄皮3に設けられた取付段部13よりも流出口6側(下側)に設けたので、ネック部10には押圧力による応力と溶融金属による熱応力が相乗的して作用することがなく、ネック部10に亀裂が発生することもなく、耐久性の長い溶融金属排出用下ノズル1が得られる。
【0022】
次に他の実施形態について説明する。
【0023】
さらに、耐熱性カバーとしての鉄皮24にはノズル本体25のテーパ部26のほぼ中間部に対向しての取付段部27を位置させ、さらにこの取付段部27からノズル本体25のネック部28方向に向い、かつ応力分散用のテーパ部、例えばテーパ部26にほぼ平行なテーパ部29を形成する。
【0024】
鉄皮24に応力分散用のテーパ部29を設けることにより、取付具により鉄皮24を介してノズル本体25にかかる応力は分散されノズル本体25のネック部28以外での亀裂発生が一層効果的に防止される。
【0025】
以上は、本発明の具体例を説明するものであり、本発明の範囲が、この実施の形態の説明により限定されるものではない。
【0026】
【発明の効果】
本発明に係わる溶融金属排出用下ノズルによれば、ノズル本体のネック部からの亀裂の発生を的確に防止でき、安全で耐久性の長い溶融金属排出用下ノズルを提供することができる。
【図面の簡単な説明】
【図1】本発明に係わる連続鋳造用下ノズルの縦断面図である。
【図2】本発明に係わる連続鋳造用下ノズルをスライドゲート装置に組み込んだ状態を示す断面図。
【図3】本発明に係わる連続鋳造用下ノズルの他の実施の形態の要部を示す断面図。
【図4】従来連続鋳造用下ノズルを示す断面図。
【符号の説明】
1 溶融金属排出用下ノズル
2 ノズル本体
3 耐熱性カバー
4 溶融金属排出用流路
5 流入口
6 流出口
7 直胴部
8 起点
9 テーパ部
10 環状のネック部
10a 変曲点
11 本体主部
12 直胴部
13 取付段部
14 鉄皮主部
15 モルタル
20 スライドゲート装置
21 取付装置
22 取付具
23 スプリング
24 鉄皮
25 ノズル本体
26 テーパ部
27 取付段部
28 ネック部
29 テーパ部
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lower nozzle for discharging a molten metal, and more particularly to a lower nozzle for discharging a molten metal, which prevents cracking of the nozzle and improves durability.
[0002]
[Prior art]
The lower nozzle for discharging molten metal is attached to the lower end of a molten metal discharging device, for example, a slide gate device for adjusting the amount of molten metal discharged in the ladle, and controls the flow of molten metal discharged from the slide gate device. It is a device to do.
[0003]
In recent years, a lower nozzle 31 for molten metal discharge, for example, a lower nozzle 31 for continuous casting as a lower nozzle for continuous casting of steel is a refractory nozzle body 33 having a molten steel flow path 32 at the center as shown in FIG. Further, the one having an iron skin 34 surrounding the nozzle body 33 is used.
[0004]
In order to attach the nozzle 31 to, for example, a slide gate device, the iron skin 34 and the nozzle body 33 are provided with attachment step portions 35 and 36, respectively.
[0005]
The mounting step 35 provided on the iron skin 34 is provided on the outlet 37 side (lower side) of the nozzle 31 with respect to the step 36 provided on the nozzle body 33.
[0006]
[Problems to be solved by the invention]
When the nozzle 31 having such a structure is attached to the lower end portion of the slide gate device by the attachment tool, the attachment step portion 35 provided on the iron skin 34 is always pressed toward the slide gate device by the attachment tool and attached to the slide gate device. . Accordingly, a pressing force F0 always acts on the mounting step portion 35 of the iron skin 34 and in the vicinity of the mounting step portion 35, and the step portion 36 provided on the nozzle body 34 facing the mounting step portion 35 is also caused by the pressing force. Stress acts. When the stress due to the pressing force acts on the stepped portion 36, the stepped portion 36 that is weak in thermal stress in shape has a crack C from the stepped portion 36 due to the synergistic effect of the thermal stress due to the molten steel and the stress due to the pressing force, and the molten steel leaks. It was dangerous.
[0007]
The present invention has been made in consideration of the above-described circumstances, and an object of the present invention is to provide a lower nozzle for discharging molten metal that is safe and highly durable.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the invention of claim 1 of the present invention is a refractory product having a molten metal inlet and outlet at both ends and a molten metal discharge channel penetrating from the inlet to the outlet. In the lower nozzle for molten metal discharge comprising the nozzle body and the heat resistant cover surrounding the nozzle body, a mounting stage for mounting the lower nozzle for discharging the molten metal on the outer periphery of the heat resistant cover to the molten metal discharging device An annular neck portion in which the outer peripheral diameter of the nozzle body starts to increase and increase at least from the mounting step portion to the nozzle inlet side than the mounting step portion. It is a gist that it is a lower nozzle for discharging molten metal, characterized in that is formed in the nozzle body.
[0009]
In the invention of claim 2 of the present application, the annular neck portion of the nozzle body changes due to the difference in inclination between the outer periphery of the nozzle body on the outlet side from the annular neck portion and the outer periphery of the nozzle body on the inlet side from the annular neck portion. The gist of the present invention is the lower nozzle for discharging molten metal according to claim 1, wherein the lower nozzle is formed by a curved point.
[0010]
The invention of claim 3 of the present application is characterized in that the heat-resistant cover is an iron skin and the mounting step portion is formed to have an annular surface perpendicular to the axial direction of the nozzle body. It is the gist that it is the lower nozzle for molten metal discharge described in 1.
[0011]
The invention of claim 4 of the present application is characterized in that a taper portion having the same taper as the outer periphery of the nozzle body at the corresponding portion is connected to the outlet side of the mounting step portion. The gist of the invention is the lower nozzle for discharging molten metal as described above.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments and implementation status of a molten metal discharge nozzle according to the present invention will be described below with reference to the accompanying drawings.
[0013]
A lower nozzle 1 for discharging a molten metal according to the present invention as shown in FIG. 1 is composed of a refractory nozzle body 2 and a heat-resistant cover surrounding the nozzle body 2, for example, an iron skin 3.
[0014]
The nozzle body 2 is provided with a molten metal discharge channel 4 extending in the axial direction in the center, and an inlet 5 and an outlet 6 are provided in the molten metal discharge channel 4. Further, the nozzle body 2 has a cylindrical shape, and the outer peripheral shape of the nozzle body 2 has a straight barrel portion 7 and an end portion of the straight barrel portion 7 as a starting point 8, and has a tapered portion 9 that tapers from the starting point 8. The taper portion 9 has a main body 11 having a different slope from the end point, that is, the inflection point 10a, and has a tapered shape.
[0015]
The gradient of the main body 11 is formed smaller than the gradient of the tapered portion 9, and a concave annular neck 10 is formed at the inflection point 10a. Here, the main body main portion 11 has a gradient of 0, that is, the main body main portion 11 extending from the neck portion 10 may have a cylindrical shape along the vertical line and having the same outer diameter.
[0016]
On the other hand, the iron skin 3 has a straight body portion 12 having an inner wall surface parallel to the straight body portion 7 of the nozzle body 2, and an entrance 5 from a neck portion 10 of the nozzle body 2 is provided at the end of the straight body portion 12. An annular mounting step portion 13 is provided on the side, and an iron skin main portion 14 extending from the mounting step portion 13 and having a gradient is formed. The iron skin main part 14 may also have a cylindrical shape without a gradient.
[0017]
The tapered portion 9 of the nozzle body 2 is formed so as to face the mounting step portion 13 described above, and the inflection point 10, so that the starting point 8 is located on the inlet 5 side (upper side) from the mounting step portion 13, That is, the neck portion 10 is formed so as to be positioned with a separation distance L on the outlet 6 side (lower side) from the mounting step portion 13. The gap formed between the nozzle body 2 and the iron skin 3 is filled with mortar 15.
[0018]
Since the lower nozzle 1 for discharging molten metal according to the present invention has the above-described structure, it is necessary to install the molten metal discharging device, for example, the slide gate device 20 in the slide gate device 20 as shown in FIG. The mounting step portion 13 of the iron skin 3 is pressed in the direction of the slide gate device 20 by the mounting tool 22 of the mounting device 21 provided to be rotatable. At this time, the fixture 22 is constantly pressed in the direction of the slide gate device 20 by the spring 23, and the mounting step 13 is always pressed by the fixture 22, so that the nozzle 1 is securely held by the slide gate device 20.
[0019]
The mounting step portion 13 is constantly pressed by the mounting tool 22, but the stress due to this pressing force does not directly act on the neck portion 10 of the nozzle body 2.
[0020]
Therefore, even if molten metal is flowed to the lower nozzle 1 for discharging the molten metal through the slide gate device 20 in such a state, only the thermal stress due to the molten metal acts on the neck portion 10 of the nozzle body 2, and the nozzle The main body 2 does not crack from the neck portion 10 that is weakest in terms of shape.
[0021]
In short, the lower nozzle 1 for discharging molten metal according to the present invention is provided with the neck portion 10 provided on the nozzle body 2 on the outlet 6 side (lower side) than the mounting step portion 13 provided on the iron shell 3. The neck portion 10 does not act synergistically with the stress caused by the pressing force and the thermal stress caused by the molten metal, and the neck portion 10 is not cracked, and has a long durability, and the lower nozzle 1 for discharging the molten metal. Is obtained.
[0022]
Next, another embodiment will be described.
[0023]
Further, an attachment step portion 27 facing the substantially middle portion of the taper portion 26 of the nozzle body 25 is positioned on the iron shell 24 as a heat resistant cover, and the neck portion 28 of the nozzle body 25 is further extended from the attachment step portion 27. A tapered portion 29 that is oriented in the direction and is substantially parallel to the tapered portion 26, for example, the tapered portion 26 is formed.
[0024]
By providing the taper portion 29 for stress dispersion on the iron skin 24, the stress applied to the nozzle body 25 via the iron skin 24 is dispersed by the fixture, and cracks other than the neck portion 28 of the nozzle body 25 are more effectively generated. To be prevented.
[0025]
The above is a description of specific examples of the present invention, and the scope of the present invention is not limited by the description of this embodiment.
[0026]
【The invention's effect】
According to the lower nozzle for discharging molten metal according to the present invention, it is possible to accurately prevent the occurrence of cracks from the neck portion of the nozzle body, and to provide a safe and durable lower nozzle for discharging molten metal.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a lower nozzle for continuous casting according to the present invention.
FIG. 2 is a sectional view showing a state in which a continuous casting lower nozzle according to the present invention is incorporated in a slide gate device.
FIG. 3 is a cross-sectional view showing a main part of another embodiment of a continuous casting lower nozzle according to the present invention.
FIG. 4 is a sectional view showing a conventional lower nozzle for continuous casting.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lower nozzle 2 for discharging molten metal Nozzle body 3 Heat-resistant cover 4 Flow path for discharging molten metal 5 Inlet 6 Outlet 7 Straight body 8 Starting point 9 Tapered part 10 Annular neck 10a Inflection point 11 Main part 12 Straight barrel portion 13 Mounting step portion 14 Iron skin main portion 15 Mortar 20 Slide gate device 21 Mounting device 22 Mounting device 23 Spring 24 Iron skin 25 Nozzle body 26 Tapered portion 27 Mounting step portion 28 Neck portion 29 Tapered portion

Claims (4)

両端に溶融金属の流入口と流出口を有し、流入口から流出口にかけて貫通する溶融金属排出用流路を有する耐火物製のノズル本体と、このノズル本体を囲繞する耐熱性カバーとから構成される溶融金属排出用下ノズルにおいて、耐熱性カバーの外周に溶融金属排出用下ノズルを溶融金属排出装置に取付けるための取付段部を設け、かつ、この取付段部よりもノズルの流出口側に、少なくとも取付段部よりもノズルの流入口側に至るまでの間にわたってノズル本体の外周直径が増大変化し始める環状のネック部をノズル本体に形成したことを特徴とする溶融金属排出用下ノズル。Consists of a refractory nozzle body having a molten metal inflow port and an outflow port at both ends, a molten metal discharge channel penetrating from the inflow port to the outflow port, and a heat resistant cover surrounding the nozzle body In the molten metal discharge lower nozzle, a mounting step portion for mounting the molten metal discharge lower nozzle to the molten metal discharge device is provided on the outer periphery of the heat-resistant cover, and the outlet side of the nozzle from the mounting step portion In addition, a lower nozzle for discharging a molten metal is characterized in that an annular neck portion in which the outer diameter of the nozzle body starts to increase and change at least from the mounting step portion to the nozzle inlet side is formed in the nozzle body. . ノズル本体の環状のネック部が、環状のネック部より流出口側のノズル本体の外周と環状のネック部から流入口側のノズル本体の外周の傾斜の違いによる変曲点により形成したことを特徴とする請求項1に記載の溶融金属排出用下ノズル。The annular neck portion of the nozzle body is formed by an inflection point due to a difference in inclination between the outer periphery of the nozzle body on the outlet side from the annular neck portion and the outer periphery of the nozzle body on the inlet side from the annular neck portion. The lower nozzle for discharging molten metal according to claim 1. 耐熱性カバーを鉄皮であり、取付段部がノズル本体の軸方向に対し垂直な方向の環状面を有するように形成されていることを特徴とする請求項2に記載の溶融金属排出用下ノズル。The bottom for discharging molten metal according to claim 2, wherein the heat-resistant cover is an iron skin, and the mounting step portion is formed to have an annular surface in a direction perpendicular to the axial direction of the nozzle body. nozzle. 取付段部の流出口側に、対応する部位のノズル本体の外周と同一のテーパを有するテーパ部を連接したことを特徴とする請求項1乃至請求項3のいずれかに記載の溶融金属排出用下ノズル。The molten metal discharging device according to any one of claims 1 to 3, wherein a tapered portion having the same taper as the outer periphery of the nozzle body at a corresponding portion is connected to the outlet side of the mounting step portion. Lower nozzle.
JP03623798A 1998-02-18 1998-02-18 Lower nozzle for discharging molten metal Expired - Fee Related JP4099257B2 (en)

Priority Applications (1)

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JP03623798A JP4099257B2 (en) 1998-02-18 1998-02-18 Lower nozzle for discharging molten metal

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Application Number Priority Date Filing Date Title
JP03623798A JP4099257B2 (en) 1998-02-18 1998-02-18 Lower nozzle for discharging molten metal

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Publication Number Publication Date
JPH11226726A JPH11226726A (en) 1999-08-24
JP4099257B2 true JP4099257B2 (en) 2008-06-11

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002011566A (en) * 2000-06-29 2002-01-15 Kawasaki Refract Co Ltd Nozzle for pouring molten metal
EP1439016A1 (en) * 2003-01-20 2004-07-21 Vesuvius Group S.A Casting tube, clamping device for a casting tube and casting machine
JP5001213B2 (en) * 2008-04-16 2012-08-15 品川リフラクトリーズ株式会社 Immersion nozzle for continuous casting

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