JPS639905B2 - - Google Patents
Info
- Publication number
- JPS639905B2 JPS639905B2 JP9900383A JP9900383A JPS639905B2 JP S639905 B2 JPS639905 B2 JP S639905B2 JP 9900383 A JP9900383 A JP 9900383A JP 9900383 A JP9900383 A JP 9900383A JP S639905 B2 JPS639905 B2 JP S639905B2
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- electrode
- nozzle body
- heating
- molten metal
- 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
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 238000009749 continuous casting Methods 0.000 claims description 4
- 239000003575 carbonaceous material Substances 0.000 claims description 3
- 239000011819 refractory material Substances 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 description 15
- 239000002184 metal Substances 0.000 description 11
- 238000000034 method Methods 0.000 description 5
- 230000020169 heat generation Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000004901 spalling Methods 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
- B22D41/60—Pouring-nozzles with heating or cooling means
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Description
【発明の詳細な説明】
本発明は連続鋳造用の浸漬ノズルの構造に関
し、とくに注入前ないしは注入中にノズルを通電
加熱するのに適したノズルの構造に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a submerged nozzle for continuous casting, and in particular to a nozzle structure suitable for heating the nozzle with electricity before or during pouring.
連続鋳造において、溶融金属注入初期の浸漬ノ
ズル（以下たんにノズルという）のスポーリング
による割れや地金付着を防止するために、注入開
始前に該ノズルを加熱することが行なわれてい
る。この加熱はCOG等のガスの燃焼による場合
が多いが、このガス加熱法は、高温加熱が困難
である、加熱に長時間を要する、ノズルを均
一に加熱することが困難である等の欠点があるこ
とから、最近はノズルに直接通電してその抵抗熱
によつて加熱する方法が提案されている。この通
電加熱法は、ノズルの電気伝導性を利用し、ノズ
ルに1000〜3000Aの電流を流してジユール熱を発
生させるものであり、第１図に示すように、上下
の炭素電極２，３を介して電源７からノズル１に
電流を供給して加熱するものである。 In continuous casting, in order to prevent cracks and base metal adhesion due to spalling of a submerged nozzle (hereinafter simply referred to as a nozzle) during the initial stage of pouring molten metal, the nozzle is heated before the pouring starts. This heating is often done by burning a gas such as COG, but this gas heating method has drawbacks such as difficulty in heating at high temperatures, a long time required for heating, and difficulty in uniformly heating the nozzle. For this reason, a method has recently been proposed in which the nozzle is directly energized and heated by its resistance heat. This electrical heating method utilizes the electrical conductivity of the nozzle to generate Joule heat by passing a current of 1000 to 3000 A through the nozzle. As shown in Figure 1, upper and lower carbon electrodes 2 and 3 are connected to each other. Electric current is supplied from the power source 7 to the nozzle 1 through the nozzle 1 to heat it.
この方法では加熱終了後のノズルを電極から取
りはずして、タンデイツシユ等に装着するので、
この間にノズルの温度が降下し、エネルギー的に
不利であつた。またノズル形状に由来する電流密
度のちがいからノズルの長手方向に生じる偏熱の
ためにノズルに割れを生じたり、電極とノズルの
間の接触抵抗による発熱のために炭素電極やノズ
ルが酸化し損傷するという欠点もあつた。 In this method, after heating is completed, the nozzle is removed from the electrode and attached to a container, etc.
During this time, the temperature of the nozzle decreased, which was disadvantageous in terms of energy. In addition, the nozzle may crack due to uneven heat generated in the longitudinal direction of the nozzle due to the difference in current density due to the nozzle shape, and the carbon electrode and nozzle may be damaged due to oxidation due to heat generation due to contact resistance between the electrode and the nozzle. There was also the drawback of doing so.
本発明の目的はノズルの通電加熱に際して電極
及びノズルの損傷を防止するとともに、加熱終了
後のノズルの温度降下の問題を排除できるノズル
を提供することにある。 An object of the present invention is to provide a nozzle that can prevent damage to the electrode and nozzle during electrical heating of the nozzle, and eliminate the problem of temperature drop in the nozzle after heating is completed.
この目的を達成するための本発明のノズルは、
炭素を含有する耐火材料からなるノズルの少なく
とも上半部の外周の相対向する側に、ひれ状の炭
素質からなる電極を前記ノズル本体と一体的に形
成したことを特徴としている。 The nozzle of the present invention for achieving this purpose is
The present invention is characterized in that fin-shaped electrodes made of carbonaceous material are integrally formed with the nozzle body on opposing sides of the outer periphery of at least the upper half of the nozzle made of a refractory material containing carbon.
以下実施例を示す図面によつて本発明を詳しく
説明する。 The present invention will be explained in detail below with reference to drawings showing embodiments.
第２図ａ，ｂは本発明の一実施例を示す図で、
ａは部分断面の正面図、ｂはａのＡ―Ａ断面図で
ある。この実施例では、アルミナ―黒鉛質のノズ
ル本体１の上半部の外周に相対向するそれぞれの
側にひれ状の電極４を一体成型し、該電極４にボ
ルト・ナツト５で係止したリード線８を経て電源
７から直接ノズル本体１の電流を供給できる構造
とし、該電極４は電気抵抗の低い炭素質とした。 FIGS. 2a and 2b are diagrams showing an embodiment of the present invention,
A is a front view of a partial cross section, and b is a sectional view taken along line AA of a. In this embodiment, a fin-shaped electrode 4 is integrally molded on each side facing the outer periphery of the upper half of the nozzle body 1 made of alumina-graphite, and a lead is secured to the electrode 4 with a bolt/nut 5. The nozzle body 1 has a structure in which current can be directly supplied to the nozzle body 1 from a power source 7 via a wire 8, and the electrode 4 is made of carbonaceous material with low electrical resistance.
該炭素質の電極としたので該電極部の温度がノ
ズル本体に較べて低くノズル本体の十分安定な加
熱が可能である。なお、ノズル本体の下半部を溶
融金属注入時に鋳型内の溶融金属中に浸漬した際
に、もし下半部に炭素質の電極があると溶融金属
により電極の炭素質が溶解して溶融金属中に入
り、品質に影響を与えるという問題を生じるが、
本実施例では、炭素質の電極をノズル長手方向の
上半部だけにひれ状に設け、下半部に設けていな
いので、上記問題を生じない。 Since the carbonaceous electrode is used, the temperature of the electrode portion is lower than that of the nozzle body, and the nozzle body can be heated in a sufficiently stable manner. Note that when the lower half of the nozzle body is immersed in the molten metal in the mold when pouring molten metal, if there is a carbonaceous electrode in the lower half, the molten metal will dissolve the carbonaceous electrode and the molten metal will melt. However, this creates the problem of entering the inside and affecting quality.
In this embodiment, the carbonaceous electrode is provided in the shape of a fin only in the upper half in the longitudinal direction of the nozzle, and is not provided in the lower half, so the above problem does not occur.
さらに本実施例のノズルは電極とノズル本体と
が一体成型されているので、従来のノズルのよう
な接触抵抗による発熱はなく、またタンデイツシ
ユにノズルを装着した状態で通電加熱できるの
で、従来のノズルのように加熱終了後に電極を取
り外す必要はなく、従つて加熱終了後のノズル温
度の降下の問題は生ぜず、注入初期のトラブルは
確実に避けられる。 Furthermore, since the electrode and nozzle body of the nozzle of this embodiment are integrally molded, there is no heat generation due to contact resistance as in conventional nozzles, and the nozzle can be electrically heated with the nozzle attached to the tundish, unlike conventional nozzles. There is no need to remove the electrode after heating is completed as in the above, and therefore the problem of drop in nozzle temperature after heating is not caused, and troubles at the initial stage of injection can be reliably avoided.
さらに要すれば注入中もノズルの加熱を行なう
ことができるという利点もある。 A further advantage is that the nozzle can be heated during injection if necessary.
第３図ａ〜ｃは本発明の他の実施例を示し、ａ
は部分断面の正面図、ｂはａのＢ―Ｂ断面図、ｃ
はａのＣ―Ｃ断面図である。この実施例のノズル
は第２図に示す実施例のノズル本体の下半部にも
ノズル本体と１体の金属電極６を設けたものであ
る。そして、この電極６の材質を溶融金属によつ
て溶解されたとき溶融金属に悪影響を与えない金
属（たとえば溶鋼に対しては鋼製の電極）とし
た。 Figures 3a to 3c show other embodiments of the invention, a
is a front view of a partial cross section, b is a BB sectional view of a, c
is a CC sectional view of a. In the nozzle of this embodiment, a metal electrode 6 is provided in the lower half of the nozzle body of the embodiment shown in FIG. 2 as well as the nozzle body. The material of the electrode 6 is a metal that does not adversely affect the molten metal when it is melted by the molten metal (eg, a steel electrode for molten steel).
この実施例のノズルでは、ノズル本体の下半部
の通電加熱を該電極６により行えるので、ノズル
本体の均一加熱が速やかにでき、そのまま電極を
取り外すことなく溶融金属中に浸漬して溶解して
も品質に悪影響を与えることがない。 In the nozzle of this embodiment, the lower half of the nozzle body can be electrically heated by the electrode 6, so the nozzle body can be quickly and uniformly heated, and the nozzle body can be immersed in molten metal and melted without removing the electrode. will not adversely affect quality.
以上、述べたように本発明の連続鋳造用浸漬ノ
ズルは、炭素質の電極とノズル本体を一体的に形
成したノズルであるから、ノズル本体と電極との
接触抵抗はなく、ノズル外周の相対向するそれぞ
れの側にひれ状の電極を設けたので電流経路の面
積をノズル本体の全体にわたつてできるだけ均一
にすることができ、従つて通電加熱時の異常発熱
や偏熱を抑制でき、電極、ノズル本体が酸化損傷
することがない。またタンデイツシユに装着した
まま加熱するという従来のノズルでは不可能であ
つた加熱が可能になり、さらに加熱終了後に電極
を取り外す必要がなく、従つて所望温度に安定し
たノズルの加熱を行なうことができる。 As described above, since the immersion nozzle for continuous casting of the present invention is a nozzle in which the carbonaceous electrode and the nozzle body are integrally formed, there is no contact resistance between the nozzle body and the electrode, and the relative position of the nozzle outer periphery is eliminated. Since fin-shaped electrodes are provided on each side of the nozzle, the area of the current path can be made as uniform as possible over the entire nozzle body, and therefore abnormal heat generation and uneven heat generation during electrical heating can be suppressed. The nozzle body will not be damaged by oxidation. In addition, it is now possible to heat the nozzle while it is attached to the tundish, which was impossible with conventional nozzles.Furthermore, there is no need to remove the electrode after heating is completed, so the nozzle can be heated stably to the desired temperature. .
第１図は、従来のノズル本体の通電加熱法を説
明するための図、第２図ａは本発明の一実施例に
おけるノズルの正面部（一部縦断面図）、第２図
ｂは第２図ａのＡ―Ａ断面図、第３図ａは本発明
の他の実施例におけるノズルの正面図（一部縦断
面図）、第３図ｂは第３図ａのＢ―Ｂ断面図、第
３図ｃは第３図ａのＣ―Ｃ断面図である。
１…ノズル本体、２，３…炭素電極、４…炭素
質電極、５…ボルト・ナツト、６…金属電極、７
…電源。
FIG. 1 is a diagram for explaining a conventional electrical heating method for a nozzle body, FIG. 2a is a sectional view taken along line AA, FIG. 3a is a front view (partially longitudinal sectional view) of a nozzle in another embodiment of the present invention, and FIG. 3b is a sectional view taken along line BB in FIG. 3a. , FIG. 3c is a sectional view taken along line CC in FIG. 3a. DESCRIPTION OF SYMBOLS 1... Nozzle body, 2, 3... Carbon electrode, 4... Carbonaceous electrode, 5... Bolt/nut, 6... Metal electrode, 7
…power supply.
Claims (1)
ズル本体の少なくとも上半部の外周の相対向する
側に、ひれ状の炭素質からなる電極を前記ノズル
本体と一体的に形成したことを特徴とする連続鋳
造用ノズル。1. A cylindrical nozzle body made of a refractory material containing carbon content, and a fin-shaped electrode made of carbonaceous material is formed integrally with the nozzle body on opposing sides of the outer periphery of at least the upper half of the nozzle body. Continuous casting nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9900383A JPS59223149A (en) | 1983-06-03 | 1983-06-03 | Immersion nozzle for continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9900383A JPS59223149A (en) | 1983-06-03 | 1983-06-03 | Immersion nozzle for continuous casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59223149A JPS59223149A (en) | 1984-12-14 |
| JPS639905B2 true JPS639905B2 (en) | 1988-03-02 |
Family
ID=14234825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9900383A Granted JPS59223149A (en) | 1983-06-03 | 1983-06-03 | Immersion nozzle for continuous casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59223149A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3420263B2 (en) * | 1992-09-02 | 2003-06-23 | 黒崎播磨株式会社 | Nozzle support structure for continuous casting |
-
1983
- 1983-06-03 JP JP9900383A patent/JPS59223149A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59223149A (en) | 1984-12-14 |
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