JPH06203952A - Artificial graphite electrode for dc arc furnace - Google Patents
Artificial graphite electrode for dc arc furnaceInfo
- Publication number
- JPH06203952A JPH06203952A JP4358609A JP35860992A JPH06203952A JP H06203952 A JPH06203952 A JP H06203952A JP 4358609 A JP4358609 A JP 4358609A JP 35860992 A JP35860992 A JP 35860992A JP H06203952 A JPH06203952 A JP H06203952A
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- hole
- artificial graphite
- arc
- graphite electrode
- 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.)
- Pending
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Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Discharge Heating (AREA)
- Furnace Details (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はＤＣアーク炉用人造黒鉛
電極に関し、さらに詳しくは、使用時におけるアーク消
耗が少なく、耐消耗性に優れた、ＤＣアーク炉用の人造
黒鉛製電極に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an artificial graphite electrode for a DC arc furnace, and more particularly to an artificial graphite electrode for a DC arc furnace which has a low arc consumption during use and is excellent in wear resistance.
【０００２】[0002]
【従来の技術】アーク炉用人造黒鉛電極のアーク消耗、
すなわち電極先端のアーク発生部におけるスポーリング
による消耗および高熱による昇華消耗、を減少させる手
段として従来から最も一般的に試みられているのは、使
用する人造黒鉛の熱膨張係数、弾性率、比抵抗などの物
理的特性をコントロールすることによってアーク消耗の
少ない人造黒鉛電極を得ようとする方法である。2. Description of the Related Art Arc wear of artificial graphite electrodes for arc furnaces,
That is, the thermal expansion coefficient, elastic modulus, and specific resistance of the artificial graphite to be used have hitherto been most commonly tried as means for reducing the consumption due to spalling and the sublimation due to high heat at the arc generation portion of the electrode tip. This is a method for obtaining an artificial graphite electrode with less arc consumption by controlling physical properties such as.
【０００３】しかしながら、この種の物理的特性は原料
コークスの性質に依存する部分が多く、人造黒鉛電極の
工業的生産にあってはかかる特性のコントロールに制約
が多大であることから、かかる方法ではアーク消耗の十
分な低減効果を得るには至っていない。However, since the physical properties of this kind depend largely on the properties of the raw coke, and in the industrial production of the artificial graphite electrode, there are many restrictions on the control of such properties. It has not been possible to obtain a sufficient reduction effect of arc consumption.
【０００４】一方、最近急速に普及してきたＤＣアーク
炉においては、アーク消耗を生ずる要因として従来のＡ
Ｃアーク炉とは異なった現象が観察される。すなわち、
ＤＣアーク炉においては電極接続部周辺におけるアーク
消耗が過大である。On the other hand, in the DC arc furnace, which has been rapidly popularized recently, the conventional A
A phenomenon different from that of the C arc furnace is observed. That is,
In the DC arc furnace, arc consumption around the electrode connection is excessive.
【０００５】図３に、ＤＣアーク炉において従来の人造
黒鉛電極を用いた場合のアークの発生状況の一例を示
す。図３に示すように、電極本体２をニップル３を介し
て接続してなる従来の人造黒鉛電極１の接続部が電極先
端に近付くと、電極先端のみならず接続部近傍の割れ７
や電極接続面のすき間８からアークＡ（模式的に示す）
が発生し、それによって益々割れ７やすき間８が拡がっ
てアーク偏向が増大していくと考えられる。かかるアー
ク偏向が増大すると電極が接続部周辺で局部的に消耗
し、それによって接続部近傍の強度が低下して電極先端
部の脱落が発生し、電極原単位の悪化をもたらしてい
た。FIG. 3 shows an example of the state of arc generation when a conventional artificial graphite electrode is used in a DC arc furnace. As shown in FIG. 3, when the connecting portion of the conventional artificial graphite electrode 1 formed by connecting the electrode body 2 through the nipple 3 approaches the electrode tip, cracks 7 occur not only in the electrode tip but also in the vicinity of the connecting portion.
From the gap 8 between the electrode and the electrode connection surface to arc A (schematically shown)
It is considered that the cracks 7 and the gaps 8 are further expanded and the arc deflection is further increased. When the arc deflection increases, the electrodes are locally consumed in the vicinity of the connection portion, which lowers the strength in the vicinity of the connection portion and causes the electrode tip portion to fall off, resulting in deterioration of the electrode unit consumption.
【０００６】このようなアーク偏向の防止手段としては
従来、本来はスポンジアイアンなどの炉内への挿入を目
的とする大口径の貫通穴（例えば、直径18〜24インチ
［ 460〜610 mm］の大型電極の場合で50〜100 mmφ以上
の穴）を有する円筒状の黒鉛電極を使用し、その中空部
に不活性ガス等を流入せしめる方法があった。しかしな
がら、この方法において使用する円筒状の黒鉛電極は工
業的に製造が非常に煩雑であり、かかる貫通穴を小径に
したり径を一定にすることもむずかしく、またそのアー
ク偏向防止効果も期待されるほどではなかった。このた
め、上記の円筒状黒鉛電極を使用する従来の方法はＤＣ
アーク炉におけるアーク偏向の防止手段としては未だ充
分でなく、より簡便にかつ効果的にアーク偏向を防止で
きる手段が求められていた。As a means for preventing such arc deflection, conventionally, a large diameter through hole (for example, a diameter of 18 to 24 inches [460 to 610 mm], which is originally intended to insert a sponge iron into a furnace, is used. In the case of a large electrode, there was a method of using a cylindrical graphite electrode having a hole of 50 to 100 mmφ or more) and allowing an inert gas or the like to flow into the hollow portion thereof. However, the cylindrical graphite electrode used in this method is very complicated to manufacture industrially, and it is difficult to reduce the diameter of the through hole or to keep the diameter constant, and the arc deflection prevention effect is expected. Not so much. Therefore, the conventional method using the above cylindrical graphite electrode is DC
The means for preventing arc deflection in an arc furnace is not yet sufficient, and there has been a demand for means that can more simply and effectively prevent arc deflection.
【０００７】[0007]
【発明が解決しようとする課題】本発明は、上記従来技
術の有する課題に鑑みてなされたものであり、ＤＣアー
ク炉における電極接続部近傍のアーク偏向を防止でき、
耐消耗性に優れしかも簡易に製造可能なＤＣアーク炉用
人造黒鉛電極を提供することを目的とするものである。SUMMARY OF THE INVENTION The present invention has been made in view of the above problems of the prior art, and it is possible to prevent arc deflection near the electrode connection portion in a DC arc furnace,
An object of the present invention is to provide an artificial graphite electrode for a DC arc furnace which has excellent wear resistance and can be easily manufactured.
【０００８】[0008]
【課題を解決するための手段】本発明者らは上記目的を
達成すべく鋭意研究した結果、ニップルに軸方向の貫通
孔を設けかつ電極本体の端部にも接続時に該貫通孔に連
通する空孔を設けた人造黒鉛電極が上記課題を解決し得
ることを見出し、本発明に到達した。Means for Solving the Problems As a result of intensive studies conducted by the present inventors in order to achieve the above object, the present inventors have found that a nipple is provided with an axial through hole and the end of the electrode body is communicated with the through hole at the time of connection. The inventors have found that an artificial graphite electrode having pores can solve the above-mentioned problems, and have reached the present invention.
【０００９】すなわち、本発明のＤＣアーク炉用人造黒
鉛電極は、両端部にニップル嵌合用ソケットを有する複
数の人造黒鉛製電極本体を該ソケットに嵌合したニップ
ルを介して接続してなるＤＣアーク炉用人造黒鉛電極で
あって、該ニップルに軸方向の貫通孔を設け、かつ接続
時に該貫通孔に連通する空孔を前記電極本体の端部に設
けたことを特徴とするものである。That is, the artificial graphite electrode for DC arc furnace of the present invention is a DC arc in which a plurality of artificial graphite electrode bodies having nipple fitting sockets at both ends are connected through the nipples fitted in the sockets. The artificial graphite electrode for a furnace is characterized in that an axial through hole is provided in the nipple, and a hole communicating with the through hole at the time of connection is provided at an end portion of the electrode body.
【００１０】以下、図面を参照しながら本発明のＤＣア
ーク炉用人造黒鉛電極について詳細に説明する。Hereinafter, the artificial graphite electrode for a DC arc furnace of the present invention will be described in detail with reference to the drawings.
【００１１】図１は本発明の人造黒鉛電極の接続部の一
例を示す部分断面図である。FIG. 1 is a partial sectional view showing an example of a connecting portion of an artificial graphite electrode of the present invention.
【００１２】本発明の人造黒鉛電極１は、複数の人造黒
鉛製電極本体２とそれらの電極本体を接続する人造黒鉛
製ニップル３とからなるものであり、電極本体２の両端
部にはニップル３嵌合用のソケット４が設けられてい
る。図１におけるソケット４はテーパー状凹部として形
成されており、ソケット４の側面並びにニップル３の側
面には互いに螺合するように螺子（図示せず）が刻設さ
れているが、本発明にかかるソケット４およびニップル
３は上記構造に限定されるものではない。The artificial graphite electrode 1 of the present invention comprises a plurality of artificial graphite electrode bodies 2 and an artificial graphite nipple 3 connecting the electrode bodies, and the nipples 3 are provided at both ends of the electrode body 2. A socket 4 for fitting is provided. The socket 4 in FIG. 1 is formed as a tapered recess, and a screw (not shown) is engraved on the side surface of the socket 4 and the side surface of the nipple 3 so as to be screwed with each other. The socket 4 and the nipple 3 are not limited to the above structure.
【００１３】本発明の人造黒鉛電極１にあっては、ニッ
プル３に軸方向の貫通孔５を設け、さらに電極本体２に
も接続時に貫通孔５に連通する空孔６を設ける必要があ
る。ここで、接続時に貫通孔５と空孔６とが相互に連通
していないと接続部近傍のアーク偏向が充分に防止され
ない。In the artificial graphite electrode 1 of the present invention, it is necessary to provide the nipple 3 with the through hole 5 in the axial direction and further provide the electrode body 2 with the hole 6 communicating with the through hole 5 at the time of connection. Here, if the through hole 5 and the hole 6 do not communicate with each other at the time of connection, arc deflection near the connection portion cannot be sufficiently prevented.
【００１４】本発明にかかる貫通孔５はニップル３の軸
方向、好ましくは中心軸に沿って設けられる。貫通孔５
の直径（ｄ1 ）は特に制限されないが、直径（ｄ1 ）と
電極本体２の外直径（Ｄ）との比（ｄ1 ／Ｄ）が０．０
１〜０．０５の範囲にあることが好ましい。比（ｄ1 ／
Ｄ）が０．０１未満では本発明の効果が充分に得られな
い傾向にあり、他方、比（ｄ1 ／Ｄ）が０．０５を超え
るとアーク偏向が完全に防止されなくなってくると共に
ニップル３の強度が低下して接続部における折損等のト
ラブルが生じる危険が出てくるからである。The through hole 5 according to the present invention is provided in the axial direction of the nipple 3, preferably along the central axis. Through hole 5
The diameter (d 1 ) of the electrode is not particularly limited, but the ratio (d 1 / D) of the diameter (d 1 ) to the outer diameter (D) of the electrode body 2 is 0.0.
It is preferably in the range of 1 to 0.05. Ratio (d 1 /
If D) is less than 0.01, the effect of the present invention tends not to be sufficiently obtained. On the other hand, if the ratio (d 1 / D) exceeds 0.05, arc deflection cannot be completely prevented and the nipple is not completely prevented. This is because there is a risk that the strength of No. 3 will decrease and troubles such as breakage at the connecting portion will occur.
【００１５】本発明にかかる空孔６は電極本体２を貫通
する必要はなく、ソケット４の底面から任意の深さで設
けることが好ましい。また、空孔６の方向は、貫通孔５
と同様に電極本体２の軸方向が好ましく、中心軸に沿っ
て設けることが特に好ましい。空孔６の直径（ｄ2 ）も
特に制限されないが、直径（ｄ2 ）と電極本体２の外直
径（Ｄ）との比（ｄ2 ／Ｄ）が０．０１〜０．０５の範
囲にあることが好ましい。比（ｄ2 ／Ｄ）が０．０１未
満では本発明の効果が充分に得られない傾向にあり、他
方、比（ｄ2 ／Ｄ）が０．０５を超えるとアーク偏向が
完全に防止されなくなってくる傾向にあるからである。
また、貫通孔５の直径（ｄ1 ）と空孔６の直径（ｄ2 ）
とが略同一であれば本発明の効果を安定して発揮できま
たそれらの製造がより簡易になるので好ましい。The hole 6 according to the present invention does not need to penetrate the electrode body 2, and is preferably provided at an arbitrary depth from the bottom surface of the socket 4. In addition, the direction of the holes 6 is the through holes 5
Similarly to the above, the axial direction of the electrode body 2 is preferable, and it is particularly preferable to provide it along the central axis. The diameter (d 2 ) of the holes 6 is also not particularly limited, but the ratio (d 2 / D) of the diameter (d 2 ) to the outer diameter (D) of the electrode body 2 is in the range of 0.01 to 0.05. Preferably there is. If the ratio (d 2 / D) is less than 0.01, the effect of the present invention tends to be insufficient, while if the ratio (d 2 / D) exceeds 0.05, arc deflection is completely prevented. This is because it tends to disappear.
Also, the diameter of the through hole 5 (d 1 ) and the diameter of the hole 6 (d 2 )
And are substantially the same, the effects of the present invention can be stably exhibited, and their production is simplified, which is preferable.
【００１６】また、電極本体２に設ける空孔６の深さは
特に制限されないが、貫通孔５の両側の空孔６の長さ
（深さ）と該貫通孔５の長さとの加算長（Ｌ）が、ニッ
プルの長さ（ｌ）の１．２〜３．０倍の範囲｛比（Ｌ／
ｌ）＝１．２〜３．０｝にあることが好ましく、また、
貫通孔５を挟んで対向する両側の空孔６の深さが略等し
いことが好ましい。比（Ｌ／ｌ）が１．２未満では本発
明の効果が充分に得られない傾向にあり、他方、比（Ｌ
／ｌ）が３．０を超えるとアーク偏向の防止効果が向上
しない割に製造が煩雑となるのであまり意味がないから
である。The depth of the holes 6 provided in the electrode body 2 is not particularly limited, but the sum of the length (depth) of the holes 6 on both sides of the through hole 5 and the length of the through hole 5 ( L) is in the range of 1.2 to 3.0 times the nipple length (l) {ratio (L /
1) = 1.2 to 3.0}, and
It is preferable that the holes 6 on both sides facing each other across the through hole 5 have substantially the same depth. If the ratio (L / l) is less than 1.2, the effect of the present invention tends to be insufficient, while the ratio (L / l)
This is because if / l) exceeds 3.0, the manufacturing effect becomes complicated while the effect of preventing arc deflection is not improved, so that it is meaningless.
【００１７】本発明の人造黒鉛電極に関する他の条件は
特に制限されず、使用する人造黒鉛は従来からＤＣアー
ク炉用電極に使用されているものでよい。また、その製
造方法も基本的には従来の人造黒鉛電極と同様でよく、
ニップル及び電極本体の加工時またはその後に本発明に
かかる貫通孔及び空孔をそれぞれに穿孔するなどして容
易に形成することができる。The other conditions relating to the artificial graphite electrode of the present invention are not particularly limited, and the artificial graphite used may be one that has been conventionally used for a DC arc furnace electrode. Also, the manufacturing method thereof may be basically the same as that of the conventional artificial graphite electrode,
The through holes and the holes according to the present invention can be easily formed at the time of processing the nipple and the electrode body or thereafter.
【００１８】また、使用方法も本発明の人造黒鉛電極は
従来の人造黒鉛電極と特に変わりはなく、一般的には電
極本体の一端にニップルを嵌合した状態で使用中の電極
本体の上端に順次接続して使用される。The method of use of the artificial graphite electrode of the present invention is not particularly different from that of the conventional artificial graphite electrode. Generally, the artificial graphite electrode is attached to the upper end of the electrode body in use with a nipple fitted to one end of the electrode body. Used by connecting sequentially.
【００１９】[0019]
【作用】図２（ａ）〜（ｄ）はＤＣアーク炉において本
発明の人造黒鉛電極を用いた場合のアークの発生状況を
経時的に示す。2 (a) to 2 (d) show the arc generation situation with time when the artificial graphite electrode of the present invention is used in a DC arc furnace.
【００２０】本発明の人造黒鉛電極１には上述の空孔６
−貫通孔５−空孔６からなる連通孔が接続部近傍に軸方
向に設けられているため、かかる接続部が電極先端にあ
る程度近付くと図２（ａ）に示すようにアークＡ（模式
的に示す）が上記連通孔に集中し、それによって接続部
近傍の割れや電極接続面のすき間からのアークの発生、
すなわちアーク偏向が防止される。The artificial graphite electrode 1 of the present invention has the above-mentioned holes 6 in it.
-Since the communication hole including the through hole 5 and the hole 6 is provided in the axial direction in the vicinity of the connection portion, when the connection portion approaches the electrode tip to some extent, the arc A (schematic) is shown as shown in FIG. (Shown in Fig. 4) is concentrated in the communication hole, which causes cracks in the vicinity of the connection part and generation of an arc from the gap in the electrode connection surface,
That is, arc deflection is prevented.
【００２１】このような状態は図２（ｂ）〜（ｄ）に示
すようにこの接続部が完全に消耗するまで継続し、その
間アーク偏向は防止されるので接続部近傍の異常損耗や
それによる電極先端部の脱落が防止され、その結果連続
操業下における電極原単位の低減がもたらされる。As shown in FIGS. 2 (b) to 2 (d), such a state continues until this connecting portion is completely consumed. During that time, arc deflection is prevented, so that abnormal wear in the vicinity of the connecting portion and the resulting wear The electrode tip is prevented from falling off, resulting in a reduction in the electrode unit consumption under continuous operation.
【００２２】また、本発明の人造黒鉛電極にあっては、
ニップルに貫通孔がありかつ接続部近傍の電極本体に空
孔があることによって接続部への応力集中が緩和され、
その作用によっても接続部の折損等が防止される。In the artificial graphite electrode of the present invention,
Since the nipple has a through hole and the electrode body near the connection part has holes, stress concentration on the connection part is reduced,
The action also prevents breakage of the connecting portion.
【００２３】[0023]
【実施例】以下、実施例及び比較例に基づいて本発明を
より具体的に説明する。EXAMPLES The present invention will be described more specifically below based on Examples and Comparative Examples.
【００２４】実施例１〜６ 図１に示すように両端部にテーパー状のニップル螺合用
ソケット４（JIS R 7201,T244L0 、深さ 234.6mm）を有
する 610mmφ×2400mmＬ（２４インチ×８フィート）の
人造黒鉛製電極本体２と、ソケット４に螺合する人造黒
鉛製ニップル３を製造し、それぞれの中心軸に沿って表
１に示す条件を満たす空孔６並びに貫通孔５をソケット
並びにニップル加工後旋盤穿孔によって設けた。なお、
表１中のｄ1 、ｄ2 、Ｄ、Ｌ、ｌはそれぞれ図１中でそ
れらが示す部分の寸法である。 Examples 1 to 6 A 610 mmφ × 2400 mmL (24 inches × 8 feet) having tapered nipple screwing sockets 4 (JIS R 7201, T244L0, depth 234.6 mm) at both ends as shown in FIG. An artificial graphite electrode body 2 and an artificial graphite nipple 3 screwed into a socket 4 are manufactured, and holes 6 and through holes 5 satisfying the conditions shown in Table 1 are formed along the central axes of the sockets and the nipples. It was provided by lathe drilling. In addition,
In Table 1, d 1 , d 2 , D, L, and l are the dimensions of the portions shown in FIG. 1, respectively.
【００２５】上記の電極本体２を３本ニップル３を介し
て接続して人造黒鉛電極１を作成し、６０トン容量のＤ
Ｃアーク炉の通電用電極として使用して、８０チャージ
の連続操業を行なった。その間、電極１の先端側の電極
本体２が消耗したら、一方のソケット４にニップル３を
装着した状態の新たな電極本体２を使用中の電極１上端
に接続することによって順次補充した。The above-mentioned electrode body 2 is connected through three nipples 3 to form an artificial graphite electrode 1, and D of 60 ton capacity is prepared.
It was used as a current-carrying electrode of a C arc furnace and continuously operated at 80 charges. In the meantime, when the electrode body 2 on the tip side of the electrode 1 is consumed, a new electrode body 2 with the nipple 3 attached to one socket 4 is connected to the upper end of the electrode 1 in use to replenish it in sequence.
【００２６】上記連続操業の間の電極原単位を表１に示
す。Table 1 shows the electrode basic unit during the above continuous operation.
【００２７】比較例１ 貫通孔５及び空孔６を設けなかった以外は上記実施例１
と同様にして人造黒鉛電極を作成し、それを用いて実施
例１と同様にして８０チャージの連続操業を行なった。 Comparative Example 1 Example 1 above except that the through hole 5 and the hole 6 were not provided.
An artificial graphite electrode was prepared in the same manner as described in (1) and was used for continuous operation at 80 charges in the same manner as in Example 1.
【００２８】上記連続操業の間の電極原単位を表１に示
す。Table 1 shows the basic unit of the electrode during the above continuous operation.
【００２９】[0029]
【表１】 表１に示した電極原単位から明らかなように、ニップル
を介して電極本体を接続した接続部に軸方向の孔（上記
の貫通孔及び空孔）を有する本発明の人造黒鉛電極は、
６０トン容量のＤＣアーク炉で使用した場合の電極原単
位が 1.1〜1.3kg/tonと高水準であり、貫通孔及び空孔
を持たない従来の人造黒鉛電極（電極原単位：1.4 kg/t
on）より耐消耗性が優れたものであった。[Table 1] As is clear from the electrode basic unit shown in Table 1, the artificial graphite electrode of the present invention having an axial hole (the above-mentioned through hole and hole) in the connecting portion connecting the electrode main body through the nipple,
The electrode unit consumption when used in a 60 ton capacity DC arc furnace is as high as 1.1 to 1.3 kg / ton, and the conventional artificial graphite electrode without through holes and holes (electrode unit: 1.4 kg / t)
on) was superior in wear resistance.
【００３０】[0030]
【発明の効果】以上説明したように、本発明の人造黒鉛
電極を使用すればＤＣアーク炉における電極接続部近傍
のアーク偏向が防止され、それに伴った接続部近傍の異
常損耗や電極先端部の脱落を防止できる。従って、本発
明の人造黒鉛電極は従来の人造黒鉛電極に比べて耐消耗
性が高く、本発明の人造黒鉛電極を使用することによっ
てＤＣアーク炉連続操業下における電極原単位の低減が
可能となる。As described above, when the artificial graphite electrode of the present invention is used, arc deflection in the vicinity of the electrode connection portion in the DC arc furnace is prevented, which causes abnormal wear in the vicinity of the connection portion and electrode tip portion. It can be prevented from falling off. Therefore, the artificial graphite electrode of the present invention has higher wear resistance than the conventional artificial graphite electrode, and by using the artificial graphite electrode of the present invention, it is possible to reduce the electrode unit consumption under the continuous operation of the DC arc furnace. .
【００３１】さらに、本発明の人造黒鉛電極は、貫通孔
及び空孔を持たない人造黒鉛電極本体の端部とニップル
に穿孔するだけで製造でき、その穿孔は旋盤やドリルな
どで比較的容易に可能である。従って、本発明の人造黒
鉛電極は簡単に製造でき、貫通孔及び空孔を持たない従
来の人造黒鉛電極と同様に量産が可能である。Further, the artificial graphite electrode of the present invention can be manufactured by simply making a hole in the end portion and the nipple of the artificial graphite electrode body having no through holes or holes, and the perforation is relatively easy with a lathe or a drill. It is possible. Therefore, the artificial graphite electrode of the present invention can be easily manufactured and can be mass-produced similarly to the conventional artificial graphite electrode having no through hole or void.
【図１】本発明の人造黒鉛電極の接続部の一例を示す部
分断面図である。FIG. 1 is a partial cross-sectional view showing an example of a connecting portion of an artificial graphite electrode of the present invention.
【図２】（ａ）〜（ｄ）は、ＤＣアーク炉において本発
明の人造黒鉛電極を用いた場合のアークの発生状況を経
時的に示した、電極先端部の模式断面図である。2 (a) to 2 (d) are schematic cross-sectional views of the tip of an electrode showing the arc generation state with time when the artificial graphite electrode of the present invention is used in a DC arc furnace.
【図３】 ＤＣアーク炉において従来の人造黒鉛電極を
用いた場合のアークの発生状況の一例を示した、電極先
端部の模式断面図である。FIG. 3 is a schematic cross-sectional view of a tip portion of an electrode showing an example of an arc generation state when a conventional artificial graphite electrode is used in a DC arc furnace.
１：人造黒鉛電極、２：電極本体、３：ニップル、４：
ソケット、５：貫通孔、６：空孔、７：接続部近傍の割
れ、８：電極接続面のすき間、ｄ1 ：貫通孔の直径、ｄ
2 ：空孔の直径、Ｄ：電極本体の外直径、Ｌ：貫通孔の
両側の空孔の深さと該貫通孔の長さとの加算長、ｌ：ニ
ップルの長さ、Ａ：アーク。1: Artificial graphite electrode, 2: Electrode body, 3: Nipple, 4:
Socket, 5: through hole, 6: hole, 7: crack in the vicinity of connecting portion, 8: gap of electrode connecting surface, d 1 : diameter of through hole, d
2 : Diameter of hole, D: Outer diameter of electrode body, L: Addition length of depth of holes on both sides of through hole and length of the through hole, 1: Length of nipple, A: Arc.
Claims (3)
る複数の人造黒鉛製電極本体を該ソケットに嵌合したニ
ップルを介して接続してなるＤＣアーク炉用人造黒鉛電
極であって、該ニップルに軸方向の貫通孔を設け、かつ
接続時に該貫通孔に連通する空孔を前記電極本体の端部
に設けたことを特徴とするＤＣアーク炉用人造黒鉛電
極。1. An artificial graphite electrode for a DC arc furnace, comprising a plurality of artificial graphite electrode bodies having nipple fitting sockets at both ends connected to each other through the nipples fitted to the sockets. An artificial graphite electrode for a DC arc furnace, wherein an axial through hole is provided, and a hole communicating with the through hole at the time of connection is provided at an end of the electrode body.
（ｄ1 ）と電極本体の外直径（Ｄ）との比（ｄ1 ／Ｄ）
が０．０１〜０．０５であり、かつ前記電極本体に設け
られた空孔の直径（ｄ2 ）と電極本体の外直径（Ｄ）と
の比（ｄ2 ／Ｄ）が０．０１〜０．０５であることを特
徴とする、請求項１に記載のＤＣアーク炉用人造黒鉛電
極。2. The ratio (d 1 / D) of the diameter (d 1 ) of the through hole provided in the nipple to the outer diameter (D) of the electrode body.
Is 0.01 to 0.05, and the ratio (d 2 / D) of the diameter (d 2 ) of the holes provided in the electrode body to the outer diameter (D) of the electrode body is 0.01 to It is 0.05, The artificial graphite electrode for DC arc furnaces of Claim 1 characterized by the above-mentioned.
続時に該貫通孔の一端に連通する一方の空孔と、接続時
に該貫通孔の他端に連通する他方の空孔との加算長
（Ｌ）の、ニップル全長（ｌ）に対する比（Ｌ／ｌ）が
１．２〜３．０であり、かつ上記双方の空孔の深さが略
等しいことを特徴とする、請求項１または２に記載のＤ
Ｃアーク炉用人造黒鉛電極。3. A total length of a through hole provided in the nipple, one hole communicating with one end of the through hole at the time of connection, and another hole communicating with the other end of the through hole at the time of connection. The ratio (L / l) of (L) to the total length (l) of the nipple is 1.2 to 3.0, and the depths of the both holes are substantially equal to each other. D described in 2
Artificial graphite electrode for C arc furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4358609A JPH06203952A (en) | 1992-12-28 | 1992-12-28 | Artificial graphite electrode for dc arc furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4358609A JPH06203952A (en) | 1992-12-28 | 1992-12-28 | Artificial graphite electrode for dc arc furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06203952A true JPH06203952A (en) | 1994-07-22 |
Family
ID=18460205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4358609A Pending JPH06203952A (en) | 1992-12-28 | 1992-12-28 | Artificial graphite electrode for dc arc furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06203952A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100752831B1 (en) * | 1999-09-30 | 2007-08-29 | 히다치 비아 메카닉스 가부시키가이샤 | Method and device for laser drilling organic materials |
-
1992
- 1992-12-28 JP JP4358609A patent/JPH06203952A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100752831B1 (en) * | 1999-09-30 | 2007-08-29 | 히다치 비아 메카닉스 가부시키가이샤 | Method and device for laser drilling organic materials |
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