JP6048813B2 - Consumable electrode for remelting - Google Patents
Consumable electrode for remelting Download PDFInfo
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- JP6048813B2 JP6048813B2 JP2012277917A JP2012277917A JP6048813B2 JP 6048813 B2 JP6048813 B2 JP 6048813B2 JP 2012277917 A JP2012277917 A JP 2012277917A JP 2012277917 A JP2012277917 A JP 2012277917A JP 6048813 B2 JP6048813 B2 JP 6048813B2
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Description
本発明は、真空アーク再溶解（以下、ＶＡＲという）やエレクトロスラグ再溶解（以下、ＥＳＲという）に用いられる再溶解用の消耗電極に関するものである。 The present invention relates to a remelting consumable electrode used for vacuum arc remelting (hereinafter referred to as VAR) and electroslag remelting (hereinafter referred to as ESR).
例えば、高清浄度鋼、チタン等のインゴットの製造には、非汚染雰囲気下で溶融できるＶＡＲ、ＥＳＲと呼ばれる消耗電極式アーク溶解が一般的に用いられている。
この消耗電極式アーク溶解は、るつぼ内に吊り下げた消耗電極に給電してアークを発生させ、そのアーク熱により消耗電極から溶融滴下した溶湯を凝固させる鋳造方法である。
For example, consumable electrode arc melting called VAR and ESR that can be melted in a non-contaminating atmosphere is generally used for manufacturing ingots such as high clean steel and titanium.
This consumable electrode type arc melting is a casting method in which an arc is generated by supplying power to a consumable electrode suspended in a crucible, and the molten metal melted and dropped from the consumable electrode is solidified by the arc heat.
この鋳造方法で用いる消耗電極は、所定組成の溶湯を鋳込んで母材を作製して得ることができる。そして、例えばＶＡＲでは、消耗電極と溶解プールとの間のアーク加熱を利用し、消耗電極を下端から再溶解することによりインゴットを得ることができる。この方法で得たインゴットは、これによって不純物を除去したり、未溶解を防止したり、成分組成の均一化を図ることができる。 The consumable electrode used in this casting method can be obtained by casting a molten metal having a predetermined composition to produce a base material. For example, in VAR, an ingot can be obtained by remelting the consumable electrode from the lower end using arc heating between the consumable electrode and the melting pool. The ingot obtained by this method can remove impurities, prevent undissolution, and achieve a uniform component composition.
上述した消耗電極は、所定組成の溶湯を鋳型に鋳込んで母材を得るときに、冷却過程で表面に割れが発生する場合がある。この場合には、消耗電極の表面の割れ部を除去するために、旋削等の切削加工を施す工程が必要となり、大幅な歩留低下や工数の上昇を招く。 When the above-mentioned consumable electrode is obtained by casting a molten metal having a predetermined composition into a mold to obtain a base material, cracks may occur on the surface during the cooling process. In this case, in order to remove the crack part on the surface of the consumable electrode, a process of performing a cutting process such as turning is required, which causes a significant decrease in yield and man-hour.
また、消耗電極は、次工程の溶解のために、スタブと呼ばれる把持用部材と溶接により接合される。そして、スタブと消耗電極の溶接は、消耗電極が円柱体であるということから、スタブと消耗電極とを回転させながら溶接されるのが一般的である。
スタブと消耗電極の溶接が不十分であると、溶解中に溶接部が高温に曝され、溶接強度が低下してしまい、消耗電極の残材がスタブから剥がれてインゴット中に落下する虞がある。この場合には、インゴットに混入した非健全部を切断除去したり、再度消耗電極式アーク溶解したりする工程が必要となり、大幅な歩留低下や工数の増加を招く。
In addition, the consumable electrode is joined by welding to a gripping member called a stub for melting in the next step. The stub and the consumable electrode are generally welded while rotating the stub and the consumable electrode because the consumable electrode is a cylindrical body.
If welding between the stub and the consumable electrode is inadequate, the weld will be exposed to high temperatures during melting, the welding strength will decrease, and the remaining material of the consumable electrode may be peeled off from the stub and fall into the ingot. . In this case, it is necessary to cut and remove the unhealthy part mixed in the ingot, or to perform a consumable electrode type arc melting again, resulting in a significant decrease in yield and increase in man-hours.
本発明の目的は、円柱体でなる再溶解用の消耗電極において、消耗電極鋳造時に生じる消耗電極の表面割れの問題を解決し、さらに、スタブと消耗電極との溶接作業性を向上させることができる、新規な再溶解用の消耗電極を提供することである。 An object of the present invention is to solve the problem of surface cracking of a consumable electrode that occurs during casting of a consumable electrode in a consumable electrode for remelting made of a cylindrical body, and further improve the welding workability between the stub and the consumable electrode. It is possible to provide a new reconsumable consumable electrode that can be dissolved.
本発明者は、再溶解用の消耗電極表面の割れ、およびスタブと消耗電極との溶接作業性の問題を検討し、消耗電極の本体の外周面に特定の形状を採用することで、歩留向上と工数削減を同時に達成できることを見出し、本発明に到達した。 The present inventor examined the problem of cracking on the surface of the consumable electrode for remelting and the problem of welding workability between the stub and the consumable electrode, and adopted a specific shape on the outer peripheral surface of the main body of the consumable electrode to obtain The inventors have found that improvement and man-hour reduction can be achieved at the same time, and have reached the present invention.
すなわち、本発明は、円柱体でなる再溶解用消耗電極において、前記再溶解用消耗電極の外周面には複数の凸部が配列された領域と、複数の凹部が配列された領域とが設けられ、前記複数の凹部が形成された領域は周方向に連続したリング状の領域であり、前記複数の凹部が形成された領域が前記外周面に少なくとも２つ設けられている再溶解用消耗電極の発明である。
前記凸部および前記凹部は、直方体状であることが好ましく、楕円状または半球状であることがより好ましい。
That is, according to the present invention, in the remelting consumable electrode made of a cylindrical body, a region where a plurality of convex portions are arranged and a region where a plurality of concave portions are arranged are provided on the outer peripheral surface of the remelting consumable electrode. The region where the plurality of recesses are formed is a ring-shaped region continuous in the circumferential direction, and at least two regions where the plurality of recesses are formed are provided on the outer peripheral surface. It is invention of this.
The convex part and the concave part are preferably rectangular parallelepiped, and more preferably elliptical or hemispherical.
本発明によれば、スタブとの溶接作業性を損なうことなく再溶解用の消耗電極の歩留向上を達成することができ、例えば、高清浄度鋼やチタン等のインゴットの製造に有用な技術となる。 According to the present invention, it is possible to achieve a yield improvement of a consumable electrode for remelting without impairing welding workability with a stub, for example, a technique useful for manufacturing an ingot such as high clean steel or titanium. It becomes.
本発明の重要な特徴は、円柱体でなる再溶解用の消耗電極の外周面に、特定の形状を採用したことにある。
本発明の再溶解用消耗電極の一例を模式的に表したものを図１に示す。本発明の再溶解用消耗電極１は、円柱体でなる本体の外周面に複数の凸部２を配列している。これは、再溶解用消耗電極１の表面積を増加させて、鋳造時の外部との熱交換を促進するためである。本発明の再溶解用消耗電極１は、円柱体でなる本体の外周面に複数の凸部２を配列することにより、再溶解用消耗電極作製の鋳造時に、外部との冷却が促進され、速やかに強固な凝固膜を成長させることが可能となり、表面割れを抑制することができ、歩留向上に寄与する。
本発明の再溶解用消耗電極１は、その表面積を、凹凸部のない円柱体の表面積Ｓに対して、１．０１Ｓ〜１．２０Ｓにすることが好ましい。再溶解用消耗電極１の表面積が１．０１Ｓより小さいと、鋳造時の外部との熱交換が促進されず、表面割れを抑制することが困難になる。一方、再溶解用消耗電極１の表面積が１．２０Ｓを超えると、再溶解用消耗電極１と鋳型との摩擦抵抗が増大し、抜塊が困難になる。
An important feature of the present invention resides in that a specific shape is adopted on the outer peripheral surface of the consumable electrode for remelting made of a cylindrical body.
FIG. 1 schematically shows an example of the consumable electrode for redissolution of the present invention. The remelting consumable electrode 1 of the present invention has a plurality of convex portions 2 arranged on the outer peripheral surface of a main body made of a cylindrical body. This is to increase the surface area of the remelting consumable electrode 1 and promote heat exchange with the outside during casting. In the remelting consumable electrode 1 of the present invention, by arranging a plurality of convex portions 2 on the outer peripheral surface of the main body made of a cylindrical body, cooling with the outside is promoted at the time of casting for producing the remelting consumable electrode. It is possible to grow a strong solidified film, suppress surface cracks, and contribute to yield improvement.
The remelting consumable electrode 1 of the present invention preferably has a surface area of 1.01S to 1.20S with respect to the surface area S of the cylindrical body having no irregularities. When the surface area of the remelting consumable electrode 1 is smaller than 1.01S, heat exchange with the outside during casting is not promoted, and it becomes difficult to suppress surface cracking. On the other hand, when the surface area of the remelting consumable electrode 1 exceeds 1.20 S, the frictional resistance between the remelting consumable electrode 1 and the mold increases, and it becomes difficult to perform the extraction.
上述したように、スタブと再溶解用消耗電極１の溶接は、再溶解用消耗電極１が円柱体でなるということから、再溶解用消耗電極１を２対のローラ上に配置して回転させながらスタブと溶接されるのが一般的である。上記の目的で再溶解用消耗電極１の表面積を増加させるために、再溶解用消耗電極１の全面に凸部２を設けてしまうと、再溶解用消耗電極１の受けとなる２対のローラと再溶解用消耗電極１との回転がスムーズに行えなくなる。その結果、溶接の作業性が低下することに加え、溶接が確実に行えず、溶接強度が低下してしまうという問題が生じる場合がある。
本発明の再溶解用消耗電極１は、複数の凹部３が配列された領域を設ける。そして、これら複数の凹部３が形成された領域を周方向に連続したリング状の領域とし、少なくとも２つ設ける。これにより、本発明の再溶解用消耗電極１は、その表面積を増加させることができ、表面割れの問題を解決することができる上、溶接時に用いる２対のローラとの接触が円滑になり、再溶解用消耗電極１の回転をスムーズにすることができ、溶接作業性の改善が可能となり、溶接強度が確保できる。
As described above, the welding of the stub and the remelting consumable electrode 1 is performed by arranging the remelting consumable electrode 1 on two pairs of rollers and rotating it because the remelting consumable electrode 1 is a cylindrical body. However, it is generally welded with a stub. In order to increase the surface area of the remelting consumable electrode 1 for the above purpose, if the convex portion 2 is provided on the entire surface of the remelting consumable electrode 1, two pairs of rollers that receive the remelting consumable electrode 1 are provided. And the remelting consumable electrode 1 cannot be smoothly rotated. As a result, in addition to a decrease in welding workability, there may be a problem that welding cannot be reliably performed and welding strength is reduced.
The remelting consumable electrode 1 of the present invention is provided with a region where a plurality of recesses 3 are arranged. And the area | region in which these some recessed part 3 was formed is made into the ring-shaped area | region continuous in the circumferential direction, and at least 2 is provided. As a result, the remelting consumable electrode 1 of the present invention can increase its surface area, solve the problem of surface cracking, and smooth contact with the two pairs of rollers used during welding, The remelting consumable electrode 1 can be rotated smoothly, welding workability can be improved, and welding strength can be ensured.
本発明の再溶解用消耗電極１の本体の外周面に配列する凸部２および凹部３は、その表面積を増加させることできるものであればどのような形状でもよく、直方体状、楕円状および半球状のものを適用することができる。再溶解用消耗電極を得るための鋳型を造型する観点からは、できるだけ簡素な形状がよく、直方体状の凸部および凹部とすることが好ましく、図２に示すような楕円状または半球状がより好ましい。
また、本発明の再溶解用消耗電極１の本体の外周面に配列する凸部２および凹部３は、外周面と曲面で接続するか、または面取りを施して接続することが好ましい。これにより、鋳型および再溶解用消耗電極に発生する熱応力を緩和することができ、抜塊時や冷却時に表面割れを抑制できる。
本発明の再溶解用消耗電極１の本体の外周面に配列する凸部２および凹部３は、図１に示すように、円柱体の長手方向および円周方向に沿って規則的に配列させることが好ましい。これにより、再溶解用消耗電極１の外周面を均一に冷却することができ、表面割れの抑制が可能となる。
本発明の再溶解用消耗電極１は、図１に示す凸部２および凹部３が得られるように円筒の内壁面に凹部および凸部を形成して造型された鋳型に所定組成の溶湯を鋳込むことで得ることができる。
The convex portions 2 and the concave portions 3 arranged on the outer peripheral surface of the main body of the remelting consumable electrode 1 of the present invention may have any shape as long as the surface area can be increased, and are rectangular parallelepiped, elliptical, and hemispherical. Can be applied. From the viewpoint of molding a mold for obtaining a remelting consumable electrode, the shape as simple as possible is good, and preferably a rectangular parallelepiped convex portion and concave portion, and an oval or hemispherical shape as shown in FIG. preferable.
Moreover, it is preferable to connect the convex part 2 and the recessed part 3 which are arranged in the outer peripheral surface of the main body of the remelting consumable electrode 1 of the present invention by connecting the outer peripheral surface with a curved surface or chamfering. Thereby, the thermal stress which generate | occur | produces in a casting_mold | template and the consumable electrode for remelting can be relieve | moderated, and a surface crack can be suppressed at the time of extraction or cooling.
The protrusions 2 and the recesses 3 arranged on the outer peripheral surface of the main body of the remelting consumable electrode 1 of the present invention are regularly arranged along the longitudinal direction and the circumferential direction of the cylindrical body as shown in FIG. Is preferred. Thereby, the outer peripheral surface of the remelting consumable electrode 1 can be cooled uniformly, and surface cracks can be suppressed.
The remelting consumable electrode 1 of the present invention is obtained by casting a molten metal having a predetermined composition into a mold formed by forming recesses and projections on the inner wall surface of a cylinder so as to obtain the projections 2 and recesses 3 shown in FIG. Can be obtained.
図３に示す再溶解用消耗電極１を得るために、先ず、図３に示す凸部２および凹部３を相対的に反転させて形成した鋳型を用意した。この鋳型を用いて鋳造を行い、３ｔｏｎの再溶解用消耗電極１を作製した。鋳造後に得られた再溶解用消耗電極１の表面を目視により観察を行なったところ、その表面には割れ等の欠陥が発生していないことを確認できた。
次に、得られた再溶解用消耗電極１とスタブとを回転させながら溶接した。溶接作業中には、再溶解用消耗電極１の回転をスムーズに行うことができ、再溶解用消耗電極１とスタブとの溶接を確実に行うことができた。
次に、スタブを溶接した再溶解用消耗電極１をるつぼ内に吊り下げ、再溶解用消耗電極１に給電してアークを発生させ、そのアーク熱により再溶解用消耗電極１から溶融滴下した溶湯を凝固させ、インゴットを作製した。このとき、再溶解用消耗電極１は、スタブから剥がれることなく、正常に鋳造することができ、溶接性が確保されていることが確認できた。
In order to obtain the remelting consumable electrode 1 shown in FIG. 3, first, a mold formed by relatively inverting the convex part 2 and the concave part 3 shown in FIG. 3 was prepared. Casting was performed using this mold, and a 3 ton consumable electrode 1 for remelting was produced. When the surface of the remelting consumable electrode 1 obtained after casting was visually observed, it was confirmed that no defects such as cracks were generated on the surface.
Next, the obtained remelting consumable electrode 1 and the stub were welded while rotating. During the welding operation, the remelting consumable electrode 1 can be smoothly rotated, and the remelting consumable electrode 1 and the stub can be reliably welded.
Next, the remelting consumable electrode 1 to which the stub is welded is suspended in the crucible, the remelting consumable electrode 1 is fed to generate an arc, and the molten metal melted and dropped from the remelting consumable electrode 1 by the arc heat. Was solidified to produce an ingot. At this time, the remelting consumable electrode 1 could be normally cast without being peeled off from the stub, and it was confirmed that weldability was ensured.
１ 再溶解用消耗電極
２ 凸部
３ 凹部
1 Consumable electrode for remelting 2 Convex part 3 Concave part
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Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012277917A JP6048813B2 (en) | 2012-12-20 | 2012-12-20 | Consumable electrode for remelting |
| CN201320844649.2U CN203653667U (en) | 2012-12-20 | 2013-12-19 | Consumable electrode for remelting |
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| Application Number | Priority Date | Filing Date | Title |
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| JP2012277917A JP6048813B2 (en) | 2012-12-20 | 2012-12-20 | Consumable electrode for remelting |
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| JP2014121712A JP2014121712A (en) | 2014-07-03 |
| JP6048813B2 true JP6048813B2 (en) | 2016-12-21 |
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| JP2012277917A Active JP6048813B2 (en) | 2012-12-20 | 2012-12-20 | Consumable electrode for remelting |
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Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52123904A (en) * | 1976-04-10 | 1977-10-18 | Hitachi Zosen Corp | Electrode for dissolving electroslag |
| JPS60155628A (en) * | 1984-01-10 | 1985-08-15 | Hitachi Metals Ltd | Electrode for remelting electroslag |
| JP3606404B2 (en) * | 1996-03-08 | 2005-01-05 | 日立金属株式会社 | Consumable electrode type remelting method of super heat-resistant alloy |
| JP4164780B2 (en) * | 1998-08-28 | 2008-10-15 | 大同特殊鋼株式会社 | Consumable electrode type remelting method of super heat-resistant alloy |
| JP2000109940A (en) * | 1998-10-05 | 2000-04-18 | Daido Steel Co Ltd | CONSUMABLE ELECTRODE TYPE REMELTING METHOD FOR Al AND Ti-CONTAINING SUPER HEAT-RESISTANT ALLOY |
| DE69926129T2 (en) * | 1999-10-18 | 2006-05-11 | General Electric Co. | Electrode suspension with weighing device |
| JP4214118B2 (en) * | 2005-02-04 | 2009-01-28 | 株式会社大阪チタニウムテクノロジーズ | Consumable electrode manufacturing method for consumable electrode arc melting method and end face cutting device used therefor |
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| JP2014121712A (en) | 2014-07-03 |
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