JPS6037591B2 - How to connect superconducting wires - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a method for connecting superconducting wires having a core village in the center, and a method for easily connecting superconducting wires without deteriorating their superconducting properties, electrical properties, and mechanical properties. The purpose is to provide a method.

Conventionally, OFHC was applied to the outer periphery of a superconducting wire 2 as shown in FIG.
A method of connecting superconducting wires by covering them with a stabilizing material 1 such as 1 is to perform cold compaction several times during the expansion/contraction process, but in this case, burrs 5 are removed as shown in FIG. After removing this burr, the wire is drawn again to produce a wire.

However, in recent years, the applications and specifications of superconducting wires have become diverse, so
Its structure has also become more complex, and a superconducting wire with a core material in the center as shown in FIG. 3 has appeared.

That is, as shown in FIGS. 3A and 3B, a core village provided at the center, for example, a superconducting wire 2 and a stabilizing material 1 are placed around the outer periphery of the OFHC 3.
It consists of a three-layer structure in which the following are sequentially provided.

When such superconducting wires are connected by a normal method, for example, by cold welding, as shown in FIG. 4, burrs 5 are generated.

However, when this burr 5 is removed, the superconducting strands 2 are not connected to each other, and there is a gap of 0.5 to 2. Forms the gap between the ribs. Therefore, when connecting superconducting wires with a core material, the superconducting properties are significantly impaired due to this gap. The present invention has been made as a result of intensive research aimed at improving the above drawbacks, and as a result has discovered a connection method that can significantly suppress deterioration of superconducting properties when connecting superconducting wires with a core material.

That is, the method of the present invention is a method for connecting superconducting wires having a three-layer structure in which superconducting wires and stabilizing materials are sequentially provided on the outer periphery of a core material provided at the center, and the bonding ends of the superconducting wires to be connected are A first step of removing the core material and superconducting wire to form a perforated part, a second step of cleaning the perforated part by degreasing, brushing, etc., and filling the part with a stabilizing material, and a second step of removing the end part. This process consists of a third step of abutting and cold-pressing, and a fourth step of removing burrs generated by the pressing. A fifth example of the present invention will be explained in detail based on the drawings.
As shown in the figure, the stretching process of a superconducting wire consisting of a three-layer structure with an outer diameter of 10 ribs is performed, in which OFHC 3 with a diameter of 5 willow is provided as a core material, superconducting strands 2 and OFHC are provided as stabilizing materials on the outer periphery. The core material 3 at one end of the superconducting wire and the superconducting strand 2 to be connected during processing are made with a length of about 10 to
A perforated portion 6 is provided by removing the hole in an area of approximately 15 mm.

Next, as shown in FIG. 6, the perforated portion 6 is cleaned by degreasing and brushing, and then filled with OFHC 7 similar to the core material and sealed. The superconducting wires obtained in this way were
As shown in the figure, the OFHC filled part 7 is butted and joint set, and the OFHC filled part 8 is set as shown in FIG.
Connect by adjusting the length so that the sleeves are pressed against each other. Next, the burrs 5 generated here were removed to obtain a superconducting wire according to the method of the present invention. As described above, according to the method of the present invention, by sealing the perforated portion with a material that is the same as the core material as shown in FIG. The superconducting strand 2 is not included at all, and the perforated end of the twill reaches the center of the connection just before it comes out as a burr. Therefore, the subsequent superconducting strands reach the center of the connection, and the superconducting strand 2 In this method, we were able to construct superconducting wires in which the gaps between the strands were much smaller than in the conventional method.

In addition, to show an example of the post-cold pressure method in the method of the present invention, as shown in FIG. 9, two superconducting wires 8, 8' are sandwiched between two sets of chucks 9, 9' and 10, 10'. These are butted together at the butt portion 4 to set the joint.

Furthermore, Fig. 10 shows the state in which burrs 5 are formed by performing the lining pressure, Fig. 11 is a front view of Fig. 9, and Fig. 12 shows the state immediately after performing the cold pressing. It is a front view. As detailed above, the method of the present invention has remarkable effects such as producing a superconducting wire with excellent electrical and mechanical properties without impairing the superconducting properties.

[Brief explanation of the drawing]

Figures 1 to 4 show conventional methods of connecting superconducting wires, Figures 1A and 3A are side sectional views showing one example, and Figure 1B is a side sectional view of Figure 1A. Cross-sectional view taken along line X-X',
FIG. 3B is a sectional view taken along the Y-Y' line of FIG. 3A, FIGS.
The drawings are schematic explanatory diagrams showing the steps of the method of the present invention, and FIGS. 9 to 12 are explanatory diagrams of the lining pressure and twill in the method of the present invention. 1... Stabilizing material, 2... Superconducting Qin wire, 3...
・Heartwood, 4...Joint part, 5...Burr, 6...
・Drilling part, 7... Filling part, 8, 8'...
・Superconducting wire, 9, 9', 10, 10'...Chick. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12

Claims (1)

[Claims] 1. In a method for connecting superconducting wires with a three-layer structure in which superconducting wires and stabilizing materials are sequentially provided around the outer periphery of a core material provided in the center, the joint ends of the superconducting wires to be connected are connected to the core material. and a first step of removing the superconducting wire to form a perforated portion, a second step of cleaning the perforated portion by degreasing, brushing, etc., and filling the portion with a stabilizing material, and abutting the ends. A method for connecting superconducting wires, comprising a third step of cold crimping, and a fourth step of removing burrs generated by the crimping.