JP2007173040A - Superconductive wire and manufacturing method for it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a superconductive wire and a manufacturing method for it for improving a binding state between a plurality of superconductive wire constituents and manufacturing the superconductive wire by comparatively simple work without being affected by the superconductive wire constituents. <P>SOLUTION: This superconductive wire is constituted by binding superconductive wire constituents each formed of an intermediate wire formed by wiredrawing a plurality of composite bodies 1, in each of which a superconductive strand formed of an NbTi single core wire 2 is arranged inside a copper-base metal. The end 3 of the superconductive constituent formed of the composite bodies 1 is constituted of the copper-base metal alone. When the end 3 of the superconductive wire constituent and the superconductive strand formed of the NbTi single core wire 2 are connected to each other via a joint part 4 by means of welding and the like, the superconductive wire constituent is constituted. A plurality of superconductive wire constituents are continuously connected to one another at their ends 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a superconducting wire and a method for manufacturing the same, and particularly to a wire drawing technique for a metal superconducting wire such as NbTi or Nb ₃ Sn.

  An NbTi alloy superconducting wire known as one of this type of metal superconducting wire is usually formed by inserting an NbTi rod into an oxygen-free copper pipe and drawing it, and using this as a single core wire. Is inserted into a stabilizer pipe made of oxygen-free copper, and further subjected to wire drawing, and finished to a desired wire diameter (see, for example, Patent Document 1).

Next, as other metal-based superconducting wires, Nb ₃ Sn-based, Nb ₃ Ge-based, V ₃ Ga-based, Nb ₃ Al-based A15 type compound-based superconducting wires are known.
Among these, Nb ₃ Sn superconducting wires known as typical ones are usually manufactured by methods such as an internal tin diffusion method, an external tin diffusion method, a bronze method, a tube method, and an in situ method.
Among these, in the internal tin diffusion method, an Nb rod is inserted into an oxygen-free copper pipe, wire drawing is performed, and this is used as a single core wire to obtain a desired number of single core wires. Arrange the desired number of single core wires around the member into which the rod is inserted and combine them in an oxygen-free copper pipe, repeat the wire drawing process as many times as necessary, and use this as a composite wire to convert the desired number of composite wires from oxygen-free copper Inserted into the stabilizer pipe to be further drawn, and finally, the diffusion of tin into copper (bronze) by heat treatment, and the reaction of Nb and tin, many Nb ₃ Sn superconducting filaments It is a method of forming in a bronze matrix.
Other Nb ₃ Sn-based superconducting wire manufacturing methods also embed Nb filaments in a copper or bronze matrix and finally react with Nb and tin to produce a large number of Nb ₃ Sn superconducting filaments in the bronze matrix. I am letting.

Therefore, in any of the superconducting wires obtained by each of these methods, the internal structure is provided with a stabilizer on the outer periphery, and inside the matrix made of copper, bronze, etc., NbTi or It has a structure in which a large number of Nb rods or the like that become superconductors such as Nb ₃ Sn are embedded by heat treatment, and is finished to a desired wire diameter by wire drawing.

JP-A-2-10611 (page 3, FIG. 1)

The wire drawing is thinned by hitting the tip of the superconducting wire with a device called a swaging machine (hereinafter referred to as piercing operation), and then the diameter of the outlet of the superconducting wire is smaller than the inlet called the die. This is done by passing through a metal jig having a hole, holding the superconducting wire from the die with a chuck, and pulling it out. The general cross-section reduction rate is about 10 to 30%, and this process is usually repeated several tens of times until the desired wire diameter is reached, so that it takes a lot of time for mouth-to-mouth work and die change work. There was a problem.
In order to shorten the time for die change work, continuous wire drawing with multiple dies is also performed. In this case, it is necessary to continuously pass the tips of superconducting wires through multiple dies. There is a new problem that the part is wasted due to the mouth-to-mouth work and the work time becomes longer.

  Therefore, it was attempted to eliminate the wasted part by welding the dummy copper wire and the superconducting wire, or to continuously draw a wire by welding a plurality of superconducting wires. At this time, the internal NbTi and Nb components are melted and the die is damaged, and there is a problem that the wire drawing cannot be performed.

  The present invention has been made to solve the above-described problems, and is manufactured by a relatively simple operation without improving the coupling state of a plurality of superconducting wire components and being adversely affected by superconducting wire components. It is an object to provide a superconducting wire that can be produced and a method of manufacturing the superconducting wire.

  In the superconducting wire according to the present invention, in the superconducting wire formed by joining a plurality of superconducting wire constructs in which the superconducting wires are disposed inside the base metal, the end portion of the superconducting wire construct is only the base metal. And the end portions of the superconducting wire constructs are joined to each other to continuously join the plurality of superconducting wire constructs.

  In the method of manufacturing a superconducting wire according to the present invention, in the method of manufacturing a superconducting wire by joining a plurality of superconducting wire constructs each having a superconducting wire disposed inside a base metal, the end of the superconducting wire construct is provided. The plurality of superconducting wire constituents are continuously connected by connecting the ends of the superconducting wire constituents to each other, and the combined superconducting wire configuration. The body is drawn.

  According to the present invention, it is possible to provide a superconducting wire and a method of manufacturing a superconducting wire that can be manufactured in a relatively simple operation without being adversely affected by a superconducting wire component by improving the coupling state of a plurality of superconducting wire structures. it can.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 is a longitudinal sectional view showing the structure of a composite for producing the NbTi superconducting wire in the first embodiment. 2 is a cross-sectional view taken along the line II-II in FIG. 3 is a cross-sectional view taken along line III-III in FIG.

  In FIG. 1 which shows the structure of the composite 1 for manufacturing the NbTi superconducting wire according to the first embodiment of the present invention, the same number of copper-based metal rods as the NbTi single core wires 2 are provided at both ends of the plurality of NbTi single core wires 2, respectively. 3 is welded at the joint 4, and they are combined in an oxygen-free copper tube 5.

  In FIG. 2 showing a cross-sectional configuration other than the end of the composite 1, a plurality of NbTi single core wires 2 are combined in an oxygen-free copper tube 5.

  Further, in FIG. 3 showing the cross-sectional configuration of the end portion of the composite 1, a plurality of copper-based metal rods 3 are combined in an oxygen-free copper tube 5. 2 and 3, the same reference numerals as those in FIG. 1 denote the same or corresponding parts.

61 NbTi single core wires 2 having a diameter of 3 mm and a length of 960 mm having a shape in which an NbTi rod is embedded in the center of oxygen-free copper, and a 20 mm long copper base metal rod 3 having the same diameter as the NbTi single core wire 2 122 are prepared.
Next, a copper-based metal rod 3 was welded to both ends of the NbTi single core wire 2 by a butt welder so as to form a joint portion 4 to obtain a continuous rod having a length of about 1000 mm. The weld ingot generated during welding was removed manually with a file. This operation was performed on all the NbTi single core wires 2 and the copper-based metal rods 3 to produce 61 continuous rods.
These are carefully bundled and then inserted into an oxygen-free copper tube 5 having an outer diameter of 40 mm, an inner diameter of 30 mm, and a length of 1000 mm to produce an NbTi superconducting wire having the cross-sectional shape shown in FIGS. Composite 1 was obtained. A total of 5 composites 1 were produced in the same manner.
Next, each of the composites 1 was drawn at a cross-section reduction rate of 20% (17 passes) until the diameter became 6 mm, and five intermediate wires having a length of about 44 m were obtained. These five intermediate wires were very good in workability without causing breakage at the joint 4 in the staking operation using a swaging machine and the wire drawing operation using a die. Of these five intermediate lines, about 80 cm of each of both end portions was a copper-based metal only portion.

This intermediate wire was processed as follows using a 7-pass continuous wire drawing machine capable of continuously drawing wire of 6 mm to 2.75 mm (cross-sectional reduction rate 20%: 7 passes).
First, a dummy copper wire having a diameter of 6 mm and a length of 20 m was pierced by a swaging machine, passed through each die in turn, and one of the intermediate wires was connected to the rear end portion thereof by welding. Since both were welded between copper-based metals, the NbTi component inside the superconducting wire did not melt, and the connection state was very good. The weld ingot generated during welding was removed with a file and the surface was smoothed, then the continuous wire drawing machine was operated to start the wire drawing work. The wire drawing process proceeds without causing breakage of the joint, and immediately before the first intermediate line is finished (about 305 m), the apparatus is once stopped and the second intermediate line is welded to the rear end. . Also in this case, since both were welded between the copper base metals, the connection state was very good without melting the NbTi component inside the superconducting wire. The weld ingot generated during welding was removed manually with a file and the surface was smoothed, and then the continuous wire drawing machine was operated to continue the wire drawing operation. These operations were repeated, and five intermediate lines were processed continuously. The workability of the five intermediate lines was good, and a continuous intermediate line having a diameter of 2.75 mm and a total length of about 1150 m was obtained. Of this continuous intermediate line, the tip portion was about 100 m, the connection portion was about 8 m, and the rear end portion was about 4 m, which was only a copper base metal.

  Next, this continuous intermediate wire was processed by a 7-pass continuous wire drawing machine capable of continuously drawing 2.75 mm to 1.26 mm (cross-sectional reduction rate 20%: 7 passes). At this time, similarly to the above, first, a dummy copper wire having a diameter of 2.75 mm and a length of 20 m was struck with a swaging machine, passed through each die in turn, and then a continuous intermediate wire was connected to the rear end portion by welding. did. Since both were welded between copper-based metals, the NbTi component inside the superconducting wire did not melt, and the connection state was very good. The weld ingot generated during welding was removed manually with a file, the surface was smoothed, and then the continuous wire drawing machine was operated to start the wire drawing work. The wire drawing process proceeded without causing breakage of the joint, and a continuous intermediate line having a diameter of 1.26 mm and a length of about 5590 m was obtained. Of the continuous intermediate line, the front end portion of about 115 m, the connection portion of about 40 m, and the rear end portion of about 470 m were only copper base metal.

  After cutting off the unnecessary 370 m of the copper base metal-only portion 470 m at the rear end of the continuous intermediate line, the continuous intermediate line is finally subjected to twist drawing and finish drawing, and the diameter is 1.01 mm. A final line about 8170 m long was obtained. The workability was very good without causing disconnection of the joint. Of these final wires, the tip portion is about 180 m, the connection portion is about 60 m, and the rear end portion is about 160 m, which are only copper-based metal parts. By removing these, five NbTi superconducting wires of 1570 m are finally obtained. I was able to.

In Embodiment 1 according to the present invention, as a composite 1 for producing an NbTi superconducting wire, a copper-based metal rod 3 is welded to both ends of each of a plurality of NbTi single core wires 2 at joints 4 and they are oxygen-free. What was inserted in the copper tube 5 was used.
Thereby, the both ends of the composite 1 will be comprised only with a copper base metal, and the connection of a dummy copper wire and the said composite 1 at the time of a subsequent wire drawing process, the said multiple composites 1 each other Since the joining is performed between the copper base metals, the NbTi component inside the superconducting wire is not melted, and the joining state is very good. Further, the weld ingot generated during welding can be easily removed with a file, and the surface passes through the die with a smooth surface, so that the wire drawing can be performed without damaging the die. For these reasons, the plurality of joined composites 1 can be drawn without breaking to the desired wire diameter, and a plurality of NbTi superconducting wires can be continuously obtained.

(1A) According to Embodiment 1 of the present invention, an intermediate wire obtained by drawing a plurality of composites 1 in which a superconducting element wire made of a NbTi single core wire 2 is disposed inside a base metal made of a copper-based metal In the superconducting wire constituted by joining the superconducting wire constituting body composed of each other, the end portion of the superconducting wire constituting body composed of an intermediate line obtained by drawing the composite 1 is composed only of a base metal made of a copper base metal, The end of the superconducting wire structure made of the composite 1 and the superconducting element wire made of the NbTi single core wire 2 are joined to form a superconducting wire structure, and the ends of the plurality of superconducting wire structures are connected to each other. Since the plurality of superconducting wire structures are joined together by joining, the mutual coupling state of the plurality of superconducting wire structures is improved and is relatively simple without being adversely affected by the superconducting wire components. Superconducting wire that can be manufactured by work It is possible to provide.

(1B) According to the first embodiment of the present invention, an intermediate wire obtained by drawing a plurality of composites 1 in which a superconducting element wire made of a NbTi single core wire 2 is disposed inside a base metal made of a copper base metal In a method for manufacturing a superconducting wire by joining superconducting wire constituents composed of each other, an end portion of the superconducting wire constituent composed of the composite 1 is composed only of a base metal composed of a copper-based metal, and the composite 1 An end of the superconducting wire constituting body and a superconducting element wire composed of the NbTi single core wire 2 are welded at the joint 4 to form a superconducting wire constituting body, and the end of the plurality of superconducting wire constituting bodies is welded. Since the plurality of superconducting wire constructs are joined together and continuously joined together and the joined superconducting wire constructs are drawn, the ends of the superconducting wire constructs and the superconducting elements Multiple superconducting wire structures welded to a wire It is possible to provide a manufacturing method of a superconducting wire can be produced in a relatively simple task without being adversely affected by more superconducting wire components.

Embodiment 2. FIG.
A second embodiment according to the present invention will be described.
In the second embodiment, the configuration other than the specific configuration described here has the same configuration contents as the configuration in the first embodiment described above, and exhibits the same operation.

  An NbTi superconducting wire was manufactured by the same method as in the first embodiment. However, the second embodiment is different only in that each NbTi single-core wire 2 and the copper-based metal rod 3 are joined by cold welding so as to form a joint 4. Also in the second embodiment, five NbTi superconducting wires of 1570 m were finally obtained.

According to the second embodiment of the present invention, as a composite 1 for manufacturing an NbTi superconducting wire, a copper-based metal rod 3 is cold-welded at both ends of each of a plurality of NbTi single core wires 2 at joints 4, What inserted them in the oxygen-free copper tube 5 was used.
As a result, as in the first embodiment, both ends of the composite 1 are composed of only a copper-based metal. During the subsequent wire drawing process, the connection between the dummy copper wire and the composite 1, a plurality Since the composites 1 were welded between the copper base metals, the NbTi component inside the superconducting wire did not melt and the mutual bonding state was very good. Further, the weld ingot generated during welding can be easily removed with a file, and the surface passes through the die with a smooth surface, so that the wire drawing can be performed without damaging the die. For these reasons, the plurality of joined composites 1 can be drawn without breaking to the desired wire diameter, and a plurality of NbTi superconducting wires can be continuously obtained.
Moreover, in the said Embodiment 2, as the composite 1 for manufacturing a NbTi superconducting wire, it is continuous by cold-welding the copper base metal rod 3 to the both ends of each of the multiple NbTi single core wire 2 by the junction part 4. Since the rod is manufactured, the butt welding process for joining the NbTi single core wire 2 and the copper-based metal rod 3 required at Embodiment 1 to each other is not necessary, and the working time can be shortened. became.

(2A) According to Embodiment 2 of the present invention, a plurality of composites 1 (see FIG. 1) in which superconducting element wires made of NbTi single core wires 2 (see FIG. 1) are arranged inside a copper base metal are provided. In the method of manufacturing a superconducting wire by joining superconducting wire constituents composed of a drawn intermediate wire to each other, an end portion of the superconducting wire constituent consisting of the composite 1 is composed only of a copper base metal, and the composite 1 and the superconducting element wire composed of the NbTi single core wire 2 are joined to each other by cold rolling at the joint 4 (see FIG. 1) to form a superconducting wire structure. A plurality of the superconducting wire constituents are continuously connected by joining the end portions of the superconducting wire constituents to each other by welding, and the combined superconducting wire constituents are drawn. As a result, the end of the superconducting wire structure and the superconducting A line it is possible to provide a manufacturing method of a superconducting wire can be produced in a relatively simple task without being adversely affected by superconducting wire components by superconducting wire structure of the plurality of joined by cold rolling.

Embodiment 3 FIG.
A third embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a longitudinal sectional view showing the structure of the composite for producing the NbTi superconducting wire in the third embodiment. FIG. 5 is a cross-sectional view taken along line VV in FIG. 6 is a cross-sectional view taken along line VI-VI in FIG.
In the third embodiment, the configuration other than the specific configuration described here has the same configuration contents as the configuration in the first embodiment described above, and exhibits the same operation. In the drawings, the same reference numerals indicate the same or corresponding parts.

  In FIG. 4 which shows the structure of the composite 6 for manufacturing the NbTi superconducting wire in Embodiment 3 by this invention, the copper base metal rod 7 is welded by the junction part 8 to the both ends of the multiple NbTi single core wire 2, respectively. They are compounded in the oxygen-free copper tube 5.

  In FIG. 5 showing a cross-sectional configuration other than the end portion of the composite body 6 in Embodiment 3 according to the present invention, a plurality of NbTi single core wires 2 are combined in an oxygen-free copper tube 5.

  In FIG. 6 which shows the cross-sectional structure of the edge part of the said composite body 6 in Embodiment 3 by this invention, the copper base metal rod 7 is compounded in the oxygen-free copper tube 5. In FIG. A round bar that is visible from the gap between the copper-based metal rod 7 and the oxygen-free copper tube 5 is a part of the plurality of NbTi single core wires 2. 4 to 6, the same reference numerals as those in FIGS. 1 to 3 are the same or equivalent.

  61 NbTi single core wires 2 having a diameter of 3 mm and a length of 960 mm, and two copper base metal rods 7 having a diameter of 24 mm and a length of 20 mm, each having a shape in which an NbTi rod is embedded in the center of oxygen-free copper, are prepared. Next, 61 NbTi single-core wires 2 are carefully bundled, and then a copper-based metal rod 37 is pressed against one end so as to form a joint 8, and the boundary between the two is spot welded over the entire circumference. Welded by machine. This welding operation was also performed on the other end portion to obtain a continuous bar having a length of about 1000 mm. The weld ingot generated during welding was removed manually with a file. By inserting this continuous rod into an oxygen-free copper tube 5 having an outer diameter of 40 mm, an inner diameter of 30 mm, and a length of 1000 mm, a composite 6 for producing an NbTi superconducting wire having the cross-sectional shape shown in FIGS. Obtained. A total of five composites 6 were produced in the same manner. Thereafter, the composite 6 was processed by the same method as in the first embodiment, and an NbTi superconducting wire was manufactured. Also in Embodiment 3, five 1570 m were finally obtained.

In Embodiment 3 according to the present invention, as a composite 6 for manufacturing an NbTi superconducting wire, a copper-based metal rod 7 is welded to both ends of a plurality of NbTi single core wires 2 at joints 8 and these are joined with oxygen-free copper. The one inserted into the tube 5 was used.
Thereby, like Embodiment 1 and Embodiment 2, the both ends of the composite 6 will be comprised only with a copper base metal, and at the time of a subsequent wire drawing process, a dummy copper wire, the said composite 6, and Since the connection between the plurality of composite bodies 6 is welding between copper base metals, the NbTi component inside the superconducting wire is not melted, and the joining state is very good. In addition, the weld ingot generated during welding can be easily removed by manual operation with a file, and since the surface passes through the die with a smooth surface, the wire drawing can be performed without damaging the die. For these reasons, a plurality of joined composites 6 can be drawn without disconnection to a desired wire diameter, and a plurality of NbTi superconducting wires can be continuously obtained.
Moreover, in the said Embodiment 3, after bundling the several NbTi single core wire 2 as the composite body 6 for manufacturing a NbTi superconducting wire, the copper base metal rod 7 is joined to the perimeter by the junction part 8 at the both ends. Continuous bars were produced by cross spot welding. This eliminates the need for a butt welding process for joining a plurality of NbTi single core wires 2 and a plurality of copper-based metal rods 3 at both ends, which was necessary in the first embodiment, and the second embodiment. This eliminates the need for the cold-welding process, which was necessary in the past, making it possible to significantly reduce the working time.

  In the third embodiment, as in the second embodiment, the same effect as in the third embodiment can be obtained even if the NbTi single core wire 2 and the copper-based metal rod 7 are joined by cold welding.

(3A) According to Embodiment 3 of the present invention, a superconducting wire comprising an intermediate wire obtained by drawing a plurality of composites 6 in which superconducting wires comprising NbTi single-core wires 2 are disposed inside a copper base metal. In the method of manufacturing a superconducting wire by joining the constituent members to each other, the end portion of the superconducting wire composed of an intermediate wire obtained by drawing the composite 6 is used as a single unit common to a plurality of NbTi single core wires 2. The superconducting wire is composed of only a copper-based metal composed of a copper-based metal rod 7 and the end of the superconducting wire structure and the superconducting element wire composed of the NbTi single core wire 2 are joined to each other by spot welding at the joint 8. A plurality of superconducting wire constructs are continuously coupled by forming a wire constructing body and joining ends of the plurality of superconducting wire constructing members together by welding. Drawing the wire structure As a result, a superconducting wire that can be manufactured in a relatively simple operation without being adversely affected by the superconducting wire component due to a plurality of superconducting wire components in which the end of the superconducting wire component and the superconducting element wire are joined by spot welding. The manufacturing method of can be provided.

Embodiment 4 FIG.
A fourth embodiment of the present invention will be described with reference to FIG. FIG. 7 is a longitudinal sectional view of a composite for producing the NbTi superconducting wire in the fourth embodiment.
In the fourth embodiment, the configuration other than the specific configuration described here has the same configuration contents as the configuration in the first embodiment described above, and exhibits the same operation. In the drawings, the same reference numerals indicate the same or corresponding parts.

  In FIG. 7 which shows the longitudinal cross-sectional structure of the continuous bar 9 for manufacturing the NbTi superconducting wire in Embodiment 4 by this invention, the copper base metal rod 7 is each a copper base metal rod at the both ends of the multiple NbTi single core wire 2 It is welded at the joint 11 through the sheet 10.

61 NbTi single core wires 2 having a diameter of 3 mm and a length of 960 mm, two copper base metal rods 7 having a diameter of 24 mm and a length of 20 mm, and a width of 20 mm, each having a shape in which an NbTi rod is embedded in the center of oxygen-free copper. Two copper-based metal sheets 10 having a thickness of 0.3 mm and a length of 85 mm are prepared.
Next, after 61 NbTi single core wires 2 are carefully bundled, in order to form the joint 11 in a state in which the copper-based metal rod 7 is pressed against one end, the connection between the two is covered. The copper base metal sheet 10 was wound around the copper base metal sheet 10 at the boundary between the NbTi single core wire 2 and the copper base metal rod 7, and was welded with a spot welder over the entire circumference.
This welding operation was also performed on the other end, and the length was set to about 1000 mm, thereby obtaining a continuous bar 9 for manufacturing an NbTi superconducting wire having a longitudinal sectional shape shown in FIG.
A composite for producing an NbTi superconducting wire by removing the weld lump produced by welding this continuous bar manually with a file and inserting it into an oxygen-free copper pipe having an outer diameter of 40 mm, an inner diameter of 30 mm, and a length of 1000 mm. Got the body.
A total of 5 composites were produced in the same manner. Thereafter, the composite was processed by the same method as in the first embodiment to produce an NbTi superconducting wire. Even in the fourth embodiment, five NbTi superconducting wires of 1570 m were finally obtained.

In Embodiment 4 according to the present invention, as a continuous bar 9 for manufacturing an NbTi superconducting wire, a copper base metal rod 7 is connected to both ends of a plurality of NbTi single core wires 2 at a joint 11 via a copper base metal sheet 10. A welded one was used.
Next, it was made into a composite by inserting it into the oxygen-free copper tube 5, and an NbTi superconducting wire was manufactured by drawing the composite.
By this method, as in the first to third embodiments, both ends of the composite are composed of only a copper-based metal, and at the time of subsequent wire drawing, a connection between the dummy copper wire and the composite, a plurality of Since the joining of the composites of the book is welding between the copper base metals, the NbTi component inside the superconducting wire does not melt and the joining state becomes very good. Further, the weld ingot generated during welding can be easily removed with a file, and the surface passes through the die with a smooth surface, so that the wire drawing can be performed without damaging the die. For these reasons, the plurality of bonded composite bodies can be drawn without breaking to the desired wire diameter, and a plurality of NbTi superconducting wires can be continuously obtained.
Moreover, in the said Embodiment 4, after bundling a plurality of NbTi single core wires 2 as a composite for manufacturing an NbTi superconducting wire, a connecting portion between the two in a state where the copper base metal rod 7 is pressed to both ends thereof A continuous bar was manufactured by wrapping the copper base metal sheet 10 so as to cover the surface and spot welding the entire surface of the copper base metal sheet 10 at the boundary between the NbTi single core wire 2 and the copper base metal bar 7. This eliminates the need for a butt welding process for joining each of the plurality of NbTi single core wires 2 and the plurality of copper-based metal rods 3 at both ends, which is necessary in the first embodiment, and greatly reduces the work time. It became possible to shorten.
Further, since the NbTi single core wire 2 and the copper base metal rod 7 are spot-welded via the copper base metal sheet 10, the bonding strength is increased compared to the third embodiment, and there is no disconnection during wire drawing and reliability is improved. Improved.

(4A) According to the fourth embodiment of the present invention, a superconducting wire comprising an intermediate wire obtained by drawing a plurality of composites 1 in which superconducting wires comprising a NbTi single core wire 2 are disposed inside a copper base metal. In the method of manufacturing a superconducting wire by joining the constituent members to each other, the end portion of the superconducting wire constituent composed of an intermediate wire obtained by drawing the composite 1 is made of only a copper-based metal to form the joint portion 11. In this way, the superconducting wire constituting body is constructed by joining the end portion of the superconducting wire constituting body and the superconducting element wire made of the NbTi single core wire 2 by welding the sheet material made of the copper-based metal sheet 10, and a plurality A plurality of the superconducting wire constituents are continuously coupled by welding end portions of the superconducting wire constituents to each other, and the combined superconducting wire constituents are drawn. So superconducting wire construction Provided is a method of manufacturing a superconducting wire that can be manufactured by a relatively simple operation without being adversely affected by a superconducting wire component by using a plurality of superconducting wire structures in which end portions and superconducting wires are joined by welding a sheet material. be able to.

Embodiment 5 FIG.
A fifth embodiment of the present invention will be described with reference to FIG. FIG. 8 is a longitudinal sectional view of a composite for producing the NbTi superconducting wire in the fifth embodiment.
In the fifth embodiment, the configuration other than the specific configuration described here has the same configuration contents as the configuration in the first embodiment described above, and exhibits the same operation. In the drawings, the same reference numerals indicate the same or corresponding parts.

  In FIG. 8 which shows the longitudinal cross-sectional structure of the composite_body | complex 12 for manufacturing the NbTi superconducting wire in Embodiment 5 by this invention, several NbTi single core wires 2 are in the oxygen-free copper tube 13 which has a screw hole at both ends. The both ends are fixed with copper-based metal screws 14, and joints 15 are formed between the plurality of NbTi single core wires 2 and the copper-based metal screws 14.

61 NbTi single core wires 2 having a diameter of 3 mm and a length of 960 mm having a shape in which an NbTi rod is buried in the center of oxygen-free copper and two copper-based metal M34 screws 14 having a length of 20 mm are prepared.
Next, 61 NbTi single core wires 2 are carefully bundled, and then inserted into an oxygen-free copper tube 13 having an outer diameter of 40 mm, an inner diameter of 30 mm, and a length of 1000 mm having 22 mm long M34 screw holes at both ends. To do. By fastening the bundle of NbTi single core wires 2 from both ends of the oxygen-free copper tube 13 with M34 screws 14 made of copper base metal, joints 15 are formed between the plurality of NbTi single core wires 2 and the copper base metal screws 14. Thus, a composite 12 for producing an NbTi superconducting wire having the cross-sectional shape shown in FIG. 8 was obtained.
A total of five composites 12 were produced in the same manner. Thereafter, the composite 12 was processed by the same method as in the first embodiment, and an NbTi superconducting wire was manufactured. Also in the fifth embodiment, five NbTi superconducting wires of 1570 m were finally obtained.

In Embodiment 5 according to the present invention, a plurality of NbTi single core wires 2 are inserted into an oxygen-free copper tube 13 having screw holes at both ends as a composite 12 for manufacturing an NbTi superconducting wire, and both ends are respectively What was fixed with the screw 14 made of copper base metal was used.
Thereby, like Embodiment 1-4, the both ends of the composite_body | complex 12 will be comprised only with a copper base metal, and the connection of a dummy copper wire and the said composite_body | complex 12 at the time of subsequent wire drawing processing, Since joining of the plurality of composite bodies 12 is welding between copper base metals, the NbTi component inside the superconducting wire does not melt, and the joining state becomes very good.
Further, the weld ingot generated during welding can be easily removed with a file, and the surface passes through the die with a smooth surface, so that the wire drawing can be performed without damaging the die. For these reasons, the plurality of joined composite bodies 12 can be drawn without breaking to the desired wire diameter, and a plurality of NbTi superconducting wires can be continuously obtained.
And in the said Embodiment 5, as the composite_body | complex 12 for manufacturing a NbTi superconducting wire, the several NbTi single core wire 2 is inserted in the oxygen-free copper pipe which has a screw hole at both ends, and both ends are respectively copper-based. What was fixed with the metal screw 14 was used. This eliminates the need for a butt welding process for joining each of the plurality of NbTi single core wires 2 and the plurality of copper-based metal rods 3 at both ends, which is necessary in the first embodiment, and greatly reduces the work time. It became possible to shorten.
In addition, the spot welding process for joining a plurality of NbTi single core wires 2 and one copper base metal rod 7 at each end required in the third embodiment is not necessary, and the working time is greatly reduced. It became possible to do.
In addition, the spot welding process for joining the plurality of NbTi single core wires 2 and the copper base metal rods 7 arranged at both ends thereof required through the fourth embodiment via the copper base metal sheet 10 is not necessary. It has become possible to greatly reduce the time.
Furthermore, since both ends of the plurality of NbTi single core wires 2 are screwed and fixed in the oxygen-free copper tube 13 with the copper-based metal screws 14, respectively, the bonding strength is increased as compared with the second embodiment, and the wire is being drawn. The disconnection is eliminated and the reliability is improved.

(5A) According to the fifth embodiment of the present invention, a superconducting wire comprising an intermediate wire obtained by drawing a plurality of composites 1 in which superconducting wires comprising NbTi single-core wires 2 are arranged inside a copper base metal. In the method of manufacturing a superconducting wire by joining the constituent members to each other, an end portion of the superconducting wire composed of an intermediate wire obtained by drawing the composite 1 is composed only of a copper-based metal, and the superconducting wire constituent A superconducting wire structure is configured by joining the end portion and the superconducting element wire composed of the NbTi single core wire 2 with a metal screw formed as an end portion of the superconducting wire structure to join each other at the joint 15. The ends of the plurality of superconducting wire constructs are welded together to continuously join the plurality of superconducting wire constructs, and the combined superconducting wire constructs are drawn. So Manufacture of superconducting wire that can be manufactured in a relatively simple operation without being adversely affected by superconducting wire components by using a plurality of superconducting wire components joined by fixing the ends of the wire structure and superconducting wires with metal screws. A method can be provided.

  In the first to fifth embodiments, since a plurality of NbTi superconducting wires can be continuously manufactured, the number of times of die replacement can be reduced as compared with the case where each superconducting wire is manufactured separately one by one. And the reduction of manufacturing cost was achieved.

  Furthermore, in the first to fifth embodiments, not only a plurality of NbTi superconducting wires can be continuously manufactured, but also the swaging machine performs the punching operation only on the first superconducting wire. Since the superconducting wires after this time do not require a swaging work with a swaging machine, the manufacturing time and manufacturing cost can be greatly reduced. In particular, a greater effect can be expected in the case of wire drawing by a continuous wire drawing machine that performs a plurality of passes continuously.

  In general, the staking machine uses a swaging machine to squeeze the wire into a thin shape by hitting the wire from the surroundings. Therefore, the inside of the struck part is damaged and cannot be used as a superconducting wire. It becomes. Therefore, as a composite for manufacturing the NbTi superconducting wire according to the first to fifth embodiments, a copper-based metal material (copper in the first and second embodiments described above) located at each end of each of the plurality of NbTi single core wires 2 is used. By increasing the length of one of the base metal rod 3, the copper base metal rod 7 in the third and fourth embodiments and the copper base metal screw 14 in the fifth embodiment to about 200 mm, the copper base The length of the metal-only portion is increased, and by setting the side as the mouth-working side, a new effect that a defective portion generated during the same work can be reduced has also occurred.

  In the first to fifth embodiments, the case where the NbTi superconducting wire is manufactured using 61 NbTi single core wires 2 has been described. However, the 61 NbTi single core wires 2 may be replaced with one NbTi rod. In this case, the method for producing the NbTi single core wire 2 has the same effects as those of the first to fifth embodiments.

  Furthermore, even if the diameter, the outer diameter, the inner diameter, the length, the number of composites, and the like when the components used in the first to fifth embodiments are combined are changed, and the final diameter is further changed, the above-described embodiments are used. Needless to say, the same effects as those of 1 to 5 can be obtained. Further, the number of connections of the complex is not limited to five.

In the present invention, the case of manufacturing the NbTi superconducting wire has been described. However, the present invention is not limited to the method of manufacturing the NbTi superconducting wire, and A15 such as Nb ₃ Sn system, Nb ₃ Ge system, V ₃ Ga system, Nb ₃ Al system, etc. The present invention can also be applied to a manufacturing method of any type of superconducting wire such as a type compound superconducting wire.

  In the present invention, the copper-based metal refers to pure copper or copper containing a small amount of an additive element such as Sn that does not impair workability.

It is a longitudinal cross-sectional view which shows the structure of the composite_body | complex for manufacturing the NbTi superconducting wire in Embodiment 1 by this invention. It is a cross-sectional view in the II-II line of FIG. It is a cross-sectional view in the III-III line of FIG. It is a longitudinal cross-sectional view which shows the structure of the composite_body | complex for manufacturing the NbTi superconducting wire in Embodiment 3 by this invention. It is a cross-sectional view in the VV line of FIG. It is a cross-sectional view in VI-VI of FIG. It is a longitudinal cross-sectional view of the composite_body | complex for manufacturing the NbTi superconducting wire in Embodiment 4 by this invention. It is a longitudinal cross-sectional view of the composite_body | complex for manufacturing the NbTi superconducting wire in Embodiment 5 by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Composite, 2 NbTi single core wire, 3 Copper base metal rod, 4 Junction part, 5 Oxygen-free copper pipe, 6 Composite, 7 Copper base metal rod, 8 Junction part, 9 Continuous bar, 10 Copper base metal sheet, 11 Joint, 12 composite, 13 oxygen-free copper tube, 14 copper-based metal screw, 15 joint.

Claims (7)

  In a superconducting wire formed by joining a plurality of superconducting wire constituents each having a superconducting wire arranged inside the base metal, the end portion of the superconducting wire constituent is constituted only by the base metal, and the superconducting wire configuration A superconducting wire comprising joining the plurality of superconducting wire constituents continuously by joining ends of the body together.   In a method of manufacturing a superconducting wire by joining a plurality of superconducting wire constituents each having a superconducting wire disposed inside a base metal, the superconducting wire constituent end is constituted only by the base metal, and the superconducting A plurality of the superconducting wire constituents are continuously coupled by joining ends of the wire constituents to each other, and the combined superconducting wire constituents are drawn. Superconducting wire manufacturing method.   In a method of manufacturing a superconducting wire by joining a plurality of superconducting wire constructs each having a superconducting wire disposed inside a copper base metal, the end of the superconducting wire construct is composed only of a copper base metal, An end of the superconducting wire construct and the superconducting element wire are welded to form a superconducting wire construct, and a plurality of the superconducting wire constructs are continuously coupled, and the coupled superconducting conductors are combined. A method of manufacturing a superconducting wire, comprising drawing a wire structure.   In a method of manufacturing a superconducting wire by joining a plurality of superconducting wire constructs each having a superconducting wire disposed inside a copper base metal, the end of the superconducting wire construct is composed only of a copper base metal, The ends of the superconducting wire constituting body and the superconducting element wire are joined by cold rolling to form a superconducting wire constituting body, and a plurality of the superconducting wire constituting bodies are continuously joined together. A method of manufacturing a superconducting wire, comprising drawing a plurality of superconducting wire constructs.   In a method of manufacturing a superconducting wire by joining a plurality of superconducting wire constructs each having a superconducting wire disposed inside a copper base metal, the end of the superconducting wire construct is composed only of a copper base metal, An end of the superconducting wire structure and the superconducting element wire are joined by spot welding to form a superconducting wire structure, and a plurality of the superconducting wire structures are continuously coupled, A method of manufacturing a superconducting wire, comprising drawing a superconducting wire structure of a book.   In a method of manufacturing a superconducting wire by joining a plurality of superconducting wire constructs each having a superconducting wire disposed inside a copper base metal, the end of the superconducting wire construct is composed only of a copper base metal, The superconducting wire constituting body is joined by welding the end of the superconducting wire constituting body and the superconducting wire by welding a sheet material, and a plurality of the superconducting wire constituting bodies are continuously coupled. A method of manufacturing a superconducting wire, comprising drawing a plurality of superconducting wire constituents combined. In a method of manufacturing a superconducting wire by joining a plurality of superconducting wire constructs each having a superconducting wire disposed inside a copper base metal, the end of the superconducting wire construct is composed only of a copper base metal, The end of the superconducting wire structure and the superconducting element wire are joined by fixing with a metal screw to form a superconducting wire structure, and a plurality of the superconducting wire structures are continuously coupled, A method of manufacturing a superconducting wire, comprising drawing a plurality of superconducting wire constituents combined.

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