JPS60263407A - Manufacture of saddle shaped superconductive coil - Google Patents

Abstract

PURPOSE:To stop the dislocation of a superconductive wire during conduction and to maintain a stable superconductive state by pressing in a sandwich construction while pressure-welding a side arc spacer on a keystone shaped superconductive wire at both ends of a coil formation intermediate product. CONSTITUTION:A coil formation intermediate product 11 is made by winding a keystone shaped superconductive wire 10, in which a copper layer is formed on the surface of a superconductive wire of a cross-sectional rough inverted trapezoid, closely wound plural turns like a race track. Subsequently, the coil formation intermediate product 11 is mounted on the surface of a male force 12 of a semi-circular cylinder shape. In this moment, side arc spacers 13 are pressure- welded to contact semi-circular side faces 14 with both ends of the coil formation intermediate product 11. A radius of curvature of the side face 14 is set suitably depending on the configuration of the edge of a saddle shaped superconductive coil to be manufactured. Then the saddle shaped superconductive coil is manufactured by pressure-welding the female force 17 having a concave 16 of a cross-sectional semicircular cylinder shape adjoining the male force 12 in order to press the coil formation intermediate product 11 in a sandwich construction.

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing a rectangle-shaped superconducting coil.

Conventionally, a superconducting wire 1 having a substantially inverted trapezoidal cross section as shown in FIG.
A so-called keystone superconducting wire 3 with a copper layer 2 formed on its surface.
A hollow-shaped superconducting coil is manufactured using this method.

The method for manufacturing a square-shaped superconducting coil is as follows: First, a keystone-shaped superconducting wire 3 is tightly wound to produce a coil-forming intermediate.Next, a coil is formed to obtain a square-shaped superconducting coil 4. However, with this method, the keystone type superconductor wire 3 at the end of the coil forming intermediate is deformed to fill the circumference of the cape during press working, which is enlarged as shown in Fig. 3. As shown, the keystone type super vM1 conductor 3 on the end side falls sideways. As a result, the keystone-shaped superconducting edge 3 at this end is likely to move when energized, and the superconducting state is likely to be destroyed.In order to solve this problem, or along the radial direction,
Interposition of color is being done. However, end 5
Due to the complicated shape of the keystone superconducting wire 3 when energized,
It has been difficult to create a collar that can completely prevent movement. Note that deformation under isoperipheral conditions refers to, for example, when a strip-shaped tape is deformed by passing it along the curved circumferential surface of an elongated male mold with an approximately semicircular cross section and passing it across this curved surface. , refers to the conditions under which the tape can be curved without stretching or contracting on both sides along the longitudinal direction of the tape. Therefore, as will be described later, when a similar process is applied to a coil-forming intermediate formed in the shape of a racetrack, the superconducting wire (equivalent to tape) constituting it becomes twisted on the circumferential side of the male die. The horizontal fall shown in FIG. 3 occurs.

The present invention has been made in view of the above points, and it is possible to prevent the superconducting wire from shifting when energized, maintain a stable superconducting state, and facilitate the production of accessories such as collars. The present invention provides a method for manufacturing a hollow-shaped superconducting coil.

That is, in the present invention, a coil forming intermediate is formed by tightly winding a plurality of keystone superconducting wires having a substantially inverted trapezoidal cross section in a racetrack shape, and then the coil forming intermediate is wound into a semi-cylindrical male mold. Next, while pressing a side arcuate spacer so that the semicircular side surface portions are in contact with the keystone superconducting wires at both ends of the coil forming intermediate, In this method, a female mold having a recess with a semicircular cross section that abuts the coil-forming intermediate is pressed into contact with the coil-forming intermediate for sandwich-like pressing.

Embodiments of the present invention will be described below with reference to the drawings.

First, as shown in FIG. 4, a keystone superconducting wire 10, which is a superconducting wire with a substantially inverted trapezoidal cross section and a copper layer formed on its surface, is wound closely in multiple layers in a racetrack shape to produce a coil forming intermediate 11. .

Next, the coil-forming intermediate 11 is placed on the surface of a semi-cylindrical male mold 12, as shown in FIG.

At this time, the side arcuate spacer 13 is pressed against both ends of the coil forming intermediate body 11 so that its semicircular arcuate side surface portions 14 are in contact with each other. As the material of the side arcuate spacer 13, for example, copper is used so that it can easily come into close contact with the curved surface of the male die 12 during the next press process and also come into close contact with the end of the coil forming intermediate body 11. In addition, the side arc spacer 13
A large number of #$15 are formed on the surface of the mold 12 so as to be easily deformed during press working and to be in close contact with the male die 12. The radius of the curved surface of the side surface portion 14 is appropriately set depending on the shape of the end portion of the saddle-shaped superconducting coil to be manufactured. Next, a female die 17 having a concave portion 16 having a semicircular cross section that abuts the male die 12 is pressed into contact with the coil forming intermediate body 11 for sandwich-like pressing, thereby producing a saddle-shaped superconducting coil.

In this way, according to the manufacturing method of the Tonokura-shaped superconducting coil, press working is performed with the side arcuate spacers 13 fully pressed against both ends of the coil forming intermediate 11, which is shown enlarged in FIG. Thus, the keystone superconducting wire 10 at the coil end of the rectangle-shaped superconducting coil can be installed in a correctly erected state without falling sideways. As a result, it is possible to prevent the keystone type superconducting wire 1o from shifting during energization 5, and to create a stable superconducting state.

In addition, since the keystone superconducting wire 1o of the coil part is installed in the correct standing state without falling sideways, the shape of the attached parts such as collars that are interposed between them can be simplified, making it easier to manufacture. It can be done.

As explained above, according to the method for manufacturing a saddle-shaped superconducting coil according to the present invention, it is possible to stop the displacement movement of the superconducting wire during energization and maintain a stable superconducting state, and also to manufacture accessories such as collars. It is something that can be easily done.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of the keystone superconducting wire, Figure 2 is
FIG. 3 is a partially cutaway perspective view of a cross-shaped superconducting coil obtained by the conventional method. FIG. 3 is an explanatory diagram showing a keystone superconducting wire lying sideways. FIG. FIG. 5 is an explanatory diagram showing an embodiment of the present invention, and FIG. 6 is a plan view of a formed intermediate body, and FIG. 6 is a keystone-shaped superconducting wire at the coil end of a crown-shaped superconducting coil produced by the method of the present invention. FIG. 2 is an explanatory diagram showing the installation state of the DESCRIPTION OF SYMBOLS 10... Keystone type superconducting wire, 11... Coil forming intermediate body, 12... Male type, 13... Side arcuate spacer, 14... Side part, 15... Groove, 16... ...four parts, no...female type. Applicant's agent Patent attorney Suzue Takehikocho 71

Claims (1)

[Claims] A coil-forming intermediate is formed by closely winding a plurality of keystone-shaped superconducting wires having an approximately inverted trapezoidal cross section in a racetrack shape, and then the coil-forming intermediate is placed on the surface of a semi-cylindrical male mold. Next, while pressing a side arc spacer so that the semicircular side surface portions are in contact with the keystone superconducting wire at both ends of the coil forming intermediate, a semicircular cross section abutting against the male mold is pressed. 1. A method for producing a hollow-shaped superconducting coil, comprising: pressing a female mold having a recessed portion onto the coil-forming intermediate for sandwich-like pressing.