JPH03178103A - Manufacture of superconducting coil - Google Patents

Abstract

PURPOSE:To minimize the deterioration in the superconducting characteristics during winding process by a method wherein originally bent tape are rolled out so that the curvature thereof is controlled directly on winding up into a specific coil. CONSTITUTION:A tape 1 rolled out with a curve by rollers 2, 2' is deposited on a turnable 3 arranged below the rollers 2,2'. At this time, if the tape 1 is rolled out with the two rollers 2, 2' making a specific angle, the tape 1 is rolled out in a specific curvature. The bent tape 1 is wound up around a bobbin on the turntable 3 so as to be laminated forming a solenoid coil 4. Through these procedures, the solenoid coil 4 can be wound up without giving the bending strain to the tape 1 thereby minimizing the deterioration in the superconductive characteristics.

Description

Detailed Description of the Invention [Object of the Invention] (Industrial Application Field) The present invention relates to a novel method for manufacturing a superconducting coil using an oxide superconductor.

(Prior art) Conventionally, to form a coil using an oxide superconductor, YBa2Cu30v1Bi2 was added to a pipe made of metal such as silver.
After filling powder of oxide superconductor such as (Sr, Ca)4cu30x, processing such as wire drawing and rolling is performed to make a straight wire or tape, which is then wound into a coil. A superconducting coil is manufactured by heat treatment.

(Problems to be solved by the invention) In the conventional superconducting coil manufacturing method as described above, wire drawing,
Since straight superconducting wires made by rolling or other means are bent and wound into coils, [11] distortion is applied to the superconducting wires that make up the coils, resulting in deterioration of superconducting properties such as critical current density. There is a problem with this.

In particular, when using bismuth-based superconducting materials such as B12 (Sr, Ca) + Cu30x, the critical current density is It is known that wire rods with high However, when a rolled linear tape is wound into a solenoid shape as shown in Fig. 4, after the second heat treatment, an axial compression press is applied to the rolled surface where the most effective pressing effect can be obtained. It is difficult to apply it in the vertical direction.

The present invention is capable of winding a silver-sheathed superconducting wire using an oxide superconductor to make a coil without applying bending strain to the wire, and that a uniaxial compression press treatment is performed after heat treatment. The purpose of this study is to provide a method for manufacturing superconducting coils that enables the following.

[Structure of the Invention (Means for Solving the Problems)] In order to solve the above problems, the present invention provides a method for bending the rolled wire by changing the parallelism of the rolling rolls during rolling to form the superconducting wire. Utilizing this phenomenon, the deviation from the parallelism of the rolling rolls is adjusted so that the radius of curvature of the rolled wire rod becomes a predetermined value, and the rolled wire rod is placed on a turntable that rotates so that it has a constant curvature. A solenoid coil is formed by winding it into a solenoid coil shape. This is then heat treated to form a superconducting coil. Further, depending on the superconducting material used, treatments such as uniaxial compression pressing and final heat treatment are performed after the secondary heat treatment.

(Function) Hereinafter, the present invention will be explained based on the drawings. When performing rolling, if the two rolling rolls are accurately parallel, the rolled tape-shaped wire will be straight. When the rolling rolls deviate from the parallel position, the rolled tape becomes a tape-shaped wire having a radius of curvature corresponding to the deviation of the rolling rolls from parallel.

FIG. 5 shows a state where rolling is being carried out at a deviation angle of 20 from parallelism of the rolling rolls. In the state shown in FIG. 5(a), the rolling rolls 2 and 2' are tilted away from parallelism, and the wire rod 1 to be rolled is subjected to different degrees of rolling action at the left and right ends. The rolling ratio is large at the left end where the distance between the rolls 2.2' is narrow. On the other hand, the right end has a lower rolling rate and less elongation than the left end. As a result, as shown in FIG. 6(a), the rolled tape-shaped wire rod curves toward the side with a wider roll gap due to the difference in elongation at the left and right end portions. Figure 5(b) is better than Figure 5(a).
It also shows a state in which the angle θ formed by the rolling rolls is increased. In this state, the difference in compressibility between the left and right ends of the tape-shaped wire rod 1 becomes even larger, so as shown in FIG. A wire rod is obtained.

FIG. 1 is a diagram illustrating the operation of the apparatus of the present invention. The wire rod 1 which has been rolled by the rolls 2 and 2' and sent out in a curved manner is placed on a turntable 3 installed below the rolls. The rotation speed of turntable 3 at this time is
It is adjusted according to the rolling speed and the magnitude of the curvature of the tape-shaped wire being sent out.

As shown in FIG. 3, if the wire is rolled while keeping the angle formed by the two rolling rolls constant, the wire will be bent and rolled with a constant curvature. As shown in Fig. 2, a turntable S with a bent wire rod installed below the roll 2.2'
The solenoid coil 4 can be formed by stacking the layers while winding them up. By gradually lowering the turntable, a solenoid coil of any length can be formed. The diameter of the solenoid coil is adjusted by changing the deviation from parallelism of the rolling rolls. The completed solenoid coil is then heat-treated after adding reinforcing materials as necessary, creating a superconducting solenoid coil. When the superconducting properties of bismuth-based superconducting materials are improved by applying uniaxial compression press treatment after heat treatment, uniaxial compression press treatment is performed on the solenoid coil in the same direction as the rolling direction of the wire.

FIG. 7 shows another embodiment of the invention. Single-layer solenoid coils 6.7.8 of different diameters are made by the method described above. The diameter of each coil is selected so that the coils can be combined concentrically as shown in the figure. Each single layer solenoid coil 6.7.8 is combined in multiples as shown in the figure,
By electrically connecting the ends of adjacent solenoid coils, it is possible to create a multilayer solenoid coil 9 that can generate a strong magnetic field as a whole.

[Effects of the Invention] The manufacturing method of the present invention does not add a curvature to a straight tape-shaped wire rod and wind it into a coil, but rather creates a wire rod with an originally +In curvature, and controls the curvature. Since the coil is directly processed into the shape of a coil, deterioration of the superconducting properties of the wire due to winding can be reduced.

In particular, when using a superconducting material such as a bismuth-based material whose critical current density increases when the wire is subjected to a uniaxial compression press, the production method of the present invention allows the wire to be rolled in the same direction as the tape-shaped wire. It can be easily pressed into -
Layers are effective.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 are explanatory diagrams of the method for manufacturing a superconducting coil of the present invention, and FIG. 3 is an explanatory diagram of a rolling roll of the present invention.
Figure 4 shows a solenoid type superconducting coil, Figure 5,
FIG. 6 is an explanatory diagram of the operation of the rolling roll of the present invention, and FIG. 7 is an explanatory diagram of a method for manufacturing a multi-layer solenoid coil by combining single-layer solenoid coils. 1... Superconducting wire, 2, 2'... Roll, 3.
... Turntable, 4, 5... Superconducting solenoid coil, 6, 7.8... Single layer solenoid coil, 9...
・Multi-layer solenoid coil. Funeral map Figure 2 Figure 4 (a) (b) Figure 5 ( ) (b)

Claims (2)

[Claims] (1) In a method of manufacturing a superconducting coil using a wire rod that is filled with an oxide superconductor in a metal sheath material and subjected to rolling processing, etc., the radius of curvature of the wire rod after rolling is controlled by controlling the parallelism of the rolling rolls. A method for manufacturing a superconducting coil, comprising means for winding the rolled wire into a solenoid-type coil on a turntable while maintaining a constant temperature. (2) In a method of manufacturing a multilayer superconducting coil using a wire rod that is filled with an oxide superconductor in a metal sheath material and subjected to rolling processing, etc., the parallelism of the rolling rolls is controlled, and the radius of curvature of the wire rod after rolling is controlled. A plurality of solenoid coils that can be concentrically combined are formed by winding the rolled wire rod into a solenoid-type coil shape on a turntable, and the plurality of solenoid coils are concentrically combined. A method for manufacturing a superconducting coil, comprising means for electrically connecting each of the solenoid coils to form a multilayer solenoid coil.