JP2683769B2 - Method for manufacturing hollow superconductor - Google Patents
Method for manufacturing hollow superconductorInfo
- Publication number
- JP2683769B2 JP2683769B2 JP62017869A JP1786987A JP2683769B2 JP 2683769 B2 JP2683769 B2 JP 2683769B2 JP 62017869 A JP62017869 A JP 62017869A JP 1786987 A JP1786987 A JP 1786987A JP 2683769 B2 JP2683769 B2 JP 2683769B2
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- superconductor
- superconducting
- tape
- welding
- 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 - Lifetime
Links
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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
Landscapes
- Manufacturing Of Electric Cables (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
Description
【発明の詳細な説明】
［発明の目的］
（産業上の利用分野）
本発明は導体内部に冷媒を強制的に圧送する強制冷却
型の中空超電導体の製造方法に関する。
（従来の技術）
現在、核融合炉用大型マグネット、加速器用マグネッ
ト等の大型マグネットや特殊形状のマグネットへの強制
冷却方式の適用が種々検討されている。
強制冷却方式のうち、内部直接冷却方式は中空導体を
用い、導体内部にヘリウムを強制的に流して直接冷却す
る方式であるが、冷却効率に優れ、かつ機械的強度の大
なる性質を有する中空導体として、第３図及び第４図に
示すようなものが知られている。
すなわち、第３図および第４図において、超電導体１
は、多フィラメン構造の超電導線２の多数本を撚合せ、
この外周にステンレステープ３を重ね巻きしたものをス
テンレス管４中に収容した構造を有しており、この超電
導体はステンレス板を円筒状に成形しながら、その内部
にステンレステープを巻回した超電導撚線を収容し、次
いでステンレス板の突合わせ部を溶接した後、全体を矩
形状にロール成形することによって製造される。
上記の方法において、ステンレス板の突合わせ部の溶
接は、円筒状に成形された状態で行われるが、溶接部の
下面が酸化して脆くなり、後の平角加工時にクラックが
発生し易いという問題がある。この場合、ステンレス板
の開放端側からArのような不活性ガスをパイプで送給す
ることも考えられるが、上記の強制冷却型の導体の場合
には内部に超電導撚線が挿入されているため採用するこ
とができない。
（発明が解決しようとする問題点）
本発明は上記の難点を解決するためになされたもの
で、ステンレス管の溶接部の酸化を有効に防止すること
のできる中空超電導体の製造方法を提供することをその
目的とする。
［発明の構成］
（問題点を解決するための手段）
本発明は、ステンレステープを円筒状に成形しなが
ら、その内部に多数本の絶縁被覆が施された超電導撚線
を収容し、次いでステンレステープの突合わせ部を溶接
して全体を所定形状に成形した後、巻き取りボビンに巻
き取る中空超電導体の製造方法において、前記所定形状
に成形後の管内に、その巻き取り側端末部より不活性な
ガスを供給しながら前記溶接を施すことを特徴としてい
る。
（作用）
本発明においては、溶接後のステンレス管、例えば平
角形状に成形後のステンレス管の端末、すなわち巻取側
の端末より不活性なガスを供給するため、管内に超電導
撚線が挿入されていても溶接部下面を上記のガスで満た
しておくことが可能となる。不活性なガスとしてはN2ガ
ス等のほかArガス等のような不活性ガスを用いることが
できる。
（実施例）
以下本発明の一実施例について説明する。
第１図および第２図は本発明の方法に使用される製造
装置を示したものである。
第２図において符号５はステンレステープを巻回した
送り出しボビン、６は複数組の縦ロールおよび横ロール
からなるフォーミングロール、７はステンレステープを
外周に巻回した超電導撚線、８はその送り出しボビン、
９はTIG溶接機、10は成形ロール、11は巻取ボビンであ
る。
上記の装置において、ボビン５から引出されたステン
レステープ７はフォーミングロール６で円筒状に成形さ
れ、その両端部が突合わせられる。この突合わせ部は溶
接機９によりTIG溶接され、成形ロール10により平角状
に成形された後、ボビン11に巻取られる。一方超電導撚
線10は円筒状に成形されつつあるステンレステープの開
放部より管内に挿入されステンレステープとともに平角
状に成形された後、ボビン11に巻取られる。この際巻取
ボビン側の管の端末よりArが管内に送給される。
第１図は上記の巻取りボビン11を示したもので、シャ
フト12により支持されたボビン11に巻回された平角形状
の中空超電導体13の端末部13aは封止され、この端末部1
3aからチューブ14がシャフト12に取付けられたロータリ
ージョイント15に延びている。このロータリージョイン
ト15はボンベ16とチューブ17によって接続されており、
Arガスはボンベ16から端末部13aを介して中空超電導体1
3の内部へ送給される。
具体例
厚さ2mmのステンレステープを円筒状に成形しながら
内部に外形1.14mmφの多心構造のNb−Ti合金超電導線の
486本を挿入し、ステンレステープの突合わせ部をTIG溶
接した後、これを29mm×37.5mmの矩形状に成形した。こ
の際ステンレス管の端末よりArガスを送給しながら溶接
を行った。溶接部の断面を顕微鏡で観察したところクラ
ックの発生は何等認められなかった。
尚上記の実施例においてステンレス管中に超電導撚線
を収容したが、これに代わって熱処理により超電導線を
形成する複合線の多数本を撚合せた撚線を収容し最終形
状に成形後、超電導化合物生成の熱処理を施す場合も本
発明の範囲に含まれることは言うまでもない。
［発明の効果］
以上述べたように、本発明によればステンレステープ
を成形および溶接して内部に多数の超電導撚線を収容
し、所定形状に成形する際に溶接部の内側が非酸化雰囲
気に維持されるため、溶接部におけるクラックの発生を
防止することが容易になされる。従って健全な内部冷却
型の中空超電導体を長尺に亘って製造することが可能と
なる。DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a method for producing a forced cooling type hollow superconductor in which a refrigerant is forcibly pumped into a conductor. (Prior Art) At present, various studies are being made on the application of the forced cooling method to large magnets for fusion reactors, accelerator magnets, and other large magnets and specially shaped magnets. Among the forced cooling methods, the internal direct cooling method is a method in which a hollow conductor is used and helium is forced to flow inside the conductor for direct cooling, but it has excellent cooling efficiency and a large mechanical strength. As conductors, those shown in FIGS. 3 and 4 are known. That is, in FIGS. 3 and 4, the superconductor 1
Twists a large number of superconducting wires 2 with a multi-filament structure,
This superconductor has a structure in which a stainless tape 3 is wound around the outer periphery and is housed in a stainless tube 4. This superconductor is a superconducting material in which a stainless steel plate is formed into a cylindrical shape and the stainless tape is wound inside. It is manufactured by accommodating a stranded wire, then welding a butt portion of a stainless steel plate, and then roll-forming the whole into a rectangular shape. In the above method, the welding of the abutting portion of the stainless steel plate is performed in a state of being formed into a cylindrical shape, but the lower surface of the welding portion is oxidized and becomes brittle, and a problem that cracks easily occur during the subsequent flat-angle processing There is. In this case, it is possible to feed an inert gas such as Ar with a pipe from the open end side of the stainless steel plate, but in the case of the forced cooling type conductor, the superconducting stranded wire is inserted inside. Therefore, it cannot be adopted. (Problems to be Solved by the Invention) The present invention has been made to solve the above problems, and provides a method for manufacturing a hollow superconductor capable of effectively preventing oxidation of a welded portion of a stainless steel pipe. That is the purpose. [Structure of the Invention] (Means for Solving Problems) According to the present invention, a stainless steel tape is formed into a cylindrical shape, and a large number of superconducting twisted wires coated with an insulating coating are housed therein, and then a stainless steel tape is formed. In the method of manufacturing a hollow superconductor in which the abutting portion of the tape is welded to form the whole into a predetermined shape and then wound on a winding bobbin, in the tube after being formed into the predetermined shape, a portion from the end portion on the winding side is provided. The feature is that the welding is performed while supplying an active gas. (Operation) In the present invention, since the inert gas is supplied from the end of the welded stainless steel pipe, for example, the stainless steel pipe formed into a rectangular shape, that is, the winding-side end, the superconducting stranded wire is inserted into the pipe. However, the lower surface of the welded portion can be filled with the above gas. As the inert gas, it is possible to use N 2 gas and the like as well as inert gases such as Ar gas and the like. Example An example of the present invention will be described below. 1 and 2 show the manufacturing apparatus used in the method of the present invention. In FIG. 2, reference numeral 5 is a delivery bobbin wound with a stainless tape, 6 is a forming roll composed of a plurality of sets of vertical rolls and horizontal rolls, 7 is a superconducting twisted wire with a stainless tape wound around the outer periphery, and 8 is the delivery bobbin. ,
9 is a TIG welding machine, 10 is a forming roll, and 11 is a winding bobbin. In the above apparatus, the stainless tape 7 pulled out from the bobbin 5 is formed into a cylindrical shape by the forming roll 6 and both ends thereof are butted. The butt portion is TIG welded by the welding machine 9, formed into a rectangular shape by the forming roll 10, and then wound on the bobbin 11. On the other hand, the superconducting stranded wire 10 is inserted into the tube through the open portion of the stainless steel tape which is being formed into a cylindrical shape, is formed into a rectangular shape together with the stainless steel tape, and is then wound on the bobbin 11. At this time, Ar is fed into the tube from the end of the tube on the winding bobbin side. FIG. 1 shows the take-up bobbin 11 described above. The end portion 13a of the rectangular hollow superconductor 13 wound on the bobbin 11 supported by the shaft 12 is sealed, and the end portion 1a
A tube 14 extends from 3a to a rotary joint 15 attached to the shaft 12. This rotary joint 15 is connected by a cylinder 16 and a tube 17,
Ar gas is emitted from the cylinder 16 through the terminal portion 13a and the hollow superconductor 1
Delivered inside 3. Concrete example While molding a 2 mm thick stainless tape into a cylindrical shape, the inside of the Nb-Ti alloy superconducting wire of the multi-core structure with an outer diameter of 1.14 mm φ
After inserting 486 pieces and TIG welding the abutting part of the stainless steel tape, this was formed into a rectangular shape of 29 mm x 37.5 mm. At this time, welding was performed while supplying Ar gas from the end of the stainless steel pipe. When the cross section of the welded portion was observed with a microscope, no crack was found. Although the superconducting stranded wire was housed in the stainless steel tube in the above examples, the superconducting stranded wire was housed in place of the superconducting stranded wire to form a superconducting wire, and the superconducting stranded wire was formed into the final shape. It goes without saying that the case of applying a heat treatment for compound formation is also included in the scope of the present invention. [Advantages of the Invention] As described above, according to the present invention, when a stainless tape is formed and welded to accommodate a large number of superconducting stranded wires, the inside of the welded portion is a non-oxidizing atmosphere when formed into a predetermined shape. Therefore, it is easy to prevent the occurrence of cracks in the welded portion. Therefore, it becomes possible to manufacture a sound internal cooling type hollow superconductor over a long length.
【図面の簡単な説明】
第１図は本発明に用いられる不活性ガスの送給方法を示
す巻取りボビンの平面図、第２図は本発明に用いられる
装置の概略図、第３図は本発明の方法によって製造され
る超電導体の横断面図、第４図はその縦断面図である。
１、13……超電導体
６……フォーミングロール
７……超電導撚線
９……TIG溶接機
10……成形ロール
11……巻取ボビン
14、17……チューブ
15……ロータリージョイント
16……ボンベBRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a winding bobbin showing an inert gas feeding method used in the present invention, FIG. 2 is a schematic view of an apparatus used in the present invention, and FIG. FIG. 4 is a horizontal sectional view of a superconductor manufactured by the method of the present invention, and FIG. 1, 13 ... Superconductor 6 ... Forming roll 7 ... Superconducting twisted wire 9 ... TIG welding machine 10 ... Forming roll 11 ... Winding bobbin 14, 17 ... Tube 15 ... Rotary joint 16 ... Cylinder
───────────────────────────────────────────────────── フロントページの続き (72)発明者 茅沼 雅也 川崎市川崎区小田栄２丁目１番１号 昭 和電線電纜株式会社内 (72)発明者 青木 伸夫 川崎市川崎区小田栄２丁目１番１号 昭 和電線電纜株式会社内 (56)参考文献 特開 昭58−169712（ＪＰ，Ａ) 特開 昭60−223658（ＪＰ，Ａ) 特公 昭50−27590（ＪＰ，Ｂ１) ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Masaya Kayanuma Akira 2-1-1 Oda Sakae, Kawasaki-ku, Kawasaki-shi Inside Washi Electric Cable Co., Ltd. (72) Inventor Nobuo Aoki Akira 2-1-1 Oda Sakae, Kawasaki-ku, Kawasaki-shi Inside Washi Electric Cable Co., Ltd. (56) References JP-A-58-169712 (JP, A) JP-A-60-223658 (JP, A) Japanese Patent Publication Sho 50-27590 (JP, B1)
Claims (1)
部に多数本の絶縁被覆が施された超電導撚線を収容し、
次いでステンレステープの突合わせ部を溶接して全体を
所定形状に成形した後、巻き取りボビンに巻き取る中空
超電導体の製造方法において、前記所定形状に成形後の
管内に、その巻き取り側端末部より不活性なガスを供給
しながら前記溶接を施すことを特徴とする中空超電導体
の製造方法。(57) [Claims] While molding the stainless steel tape into a cylindrical shape, the superconducting stranded wire on which a large number of insulating coatings are applied is housed inside,
Next, in the method for producing a hollow superconductor which is formed by welding the abutting portions of the stainless steel tape and shaping the whole into a predetermined shape, the winding side end portion is formed in the pipe after being formed into the predetermined shape. A method for producing a hollow superconductor, characterized in that the welding is performed while supplying a more inert gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62017869A JP2683769B2 (en) | 1987-01-28 | 1987-01-28 | Method for manufacturing hollow superconductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62017869A JP2683769B2 (en) | 1987-01-28 | 1987-01-28 | Method for manufacturing hollow superconductor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63187506A JPS63187506A (en) | 1988-08-03 |
| JP2683769B2 true JP2683769B2 (en) | 1997-12-03 |
Family
ID=11955677
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62017869A Expired - Lifetime JP2683769B2 (en) | 1987-01-28 | 1987-01-28 | Method for manufacturing hollow superconductor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2683769B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2522691B2 (en) * | 1988-07-14 | 1996-08-07 | 昭和電線電纜株式会社 | Conduit tube manufacturing method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5027590A (en) * | 1973-07-09 | 1975-03-20 | ||
| DE2628166A1 (en) * | 1976-06-23 | 1978-01-05 | Kabel Metallwerke Ghh | Longitudinally welded pipe made from copper strip - using helium round welding zone to exclude air, thus raising weld strength |
| JPS57136584U (en) * | 1981-02-23 | 1982-08-26 | ||
| JPS58169712A (en) * | 1982-03-30 | 1983-10-06 | 三菱電機株式会社 | Method of producing composite superconductive wire |
| JPS60223658A (en) * | 1984-04-19 | 1985-11-08 | Furukawa Electric Co Ltd:The | Production of metallic pipe |
-
1987
- 1987-01-28 JP JP62017869A patent/JP2683769B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63187506A (en) | 1988-08-03 |
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