JPS60154415A - Apparatus for producing shaped flat twisted wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to an apparatus for manufacturing shaped flat stranded wire.
In particular, the present invention relates to improvements for providing favorable conditions for molding using tax head rolls.

Description of the Prior Art The shaped rectangular stranded wire that is the object of the present invention can be advantageously used as a stranded superconducting conductor if it is constructed using strands made of a superconducting material.

Generally, superconducting conductors can be broadly classified into monolithic type and stranded type. In stranded wire type, generally 1M
In the case of superconducting magnets of J or less, shaped rectangular stranded wire without a core material is used to increase the current density of the magnet and to enable the conductor itself to sufficiently support the electromagnetic force.

Furthermore, due to current capacity and magnet winding considerations, there is a demand for the development of a shaped rectangular stranded wire with a large number of twists and a large aspect ratio.

Such demands are particularly strong for magnets for high-energy accelerators.

FIG. 1 is a schematic diagram showing an outline of a manufacturing apparatus for forming flat stranded wire. Bobbins 2 for supplying the strands 1 are prepared according to the number of twists, and each bobbin 2 is rotated in the direction of arrow 4 within the supply cage 3 while its posture is kept constant. The strands 1 drawn out from each bobbin 2 are collected in a rectangular twisting die 5, where they are twisted together according to rotation in the four directions of the arrows. When passing through the twisting die 5, the plurality of wires 1 are stranded wires having a substantially rectangular shape (hereinafter referred to as "stranded wires having an approximate rectangular square shape").

) 6 6. -Twist 1i with rectangular approximate shape like Z
16 is passed through the rad roll 7 to the tuck in order to obtain the desired rectangular shape. The details of the tax head roll 7 will be described later, but it is composed of upper and lower and left and right roll pairs.

A shaped rectangular strand 8 is obtained, which then passes through a capstan 9 and is then wound onto a winding drum 10.

Yo, □Yugaiyu. 1. . Engineering. □ゎ The planar shape of the single stranded wire 6 is shown in FIG. 2, and the cross section is shown in FIG. The stranded wire 6 having an approximate rectangular shape is in an unstable stranded state before being passed through the tax head roll 7, especially since the edge portions have not yet been formed.
The tension acting between the supply side and the take-up side tended to break the proper stranded state, as shown in FIG.

As this trend progresses further, as shown in Figure 5, 1'
It was destroyed to such an extent that it no longer retained its original form.

This phenomenon occurs because the rectangular strands tend to become round due to the rigidity of the cable, so when one strand lifts up,
This is caused by other wires entering underneath it.

This tendency becomes more pronounced as the number of twists increases and as the aspect ratio increases.

Furthermore, the proper stranding condition may also be destroyed at the position of the rad roll 7 to the next tax. This will be explained in detail below.

FIG. 6 shows the arrangement of the tax head roll 7,
FIG. 7 shows an enlarged view of the operating portion of the tax head roll 7 of FIG.

The tax roll 7 is composed of a pair of side surface shaping rolls 11 that act from the left and right sides of the stranded wire 6 having an approximately rectangular shape, and a pair of upper and lower surface shaping rolls 12 that act from above and below. As shown in FIG. 6, the four rolls 11 and 12 are arranged so that the axes of each roll are located on the same plane.
One roll is arranged so that its circumferential surface faces the side surface of the other adjacent roll. According to this arrangement, the shape and size of the gap 1ffi13 in FIG. 6 can be changed arbitrarily, and the number of twists can be changed.

As shown in FIG. 7, the strands 1 constituting the twisted wire are passed through the gap 13.

In FIG. 8, the operating state of the tax roll 7 is illustrated divided into a side surface forming roll 11 and a top and bottom surface forming roll 12. When the stranded wire 6 having an approximately rectangular shape is formed by these rolls 11 and 12, part of the forming action is to increase the filling rate on the cross section of the element mi, as shown in Fig. 9. to work. However, part of this shaping action results in the strands 1 not being extended upstream.

This state is represented by the heel 1a shown in the lower drawing of FIG. For this reason, the A8
The strand 1a extending between them is looser than the strand 1 between XY, and the strand 1a between AB is in a floating state.

This state is shown in FIG. 10, which shows the line E-FIIi plane of FIG. 8. As shown in FIG. 10, in the gap formed by the lifted strands 1a, adjacent strands
enters the wire, destroying the shape of the rectangular stranded wire. That is, A
The reason why the wire 1a between points B can maintain its rectangular state is because of the friction between points A and B and the adjacent wire.

In this case as well, the tendency for the above-mentioned proper twisted state to be disrupted becomes more pronounced as the number of twists increases and as the aspect ratio increases.

Purpose of the Invention Therefore, an object of the present invention is to provide an apparatus for manufacturing a shaped flat stranded wire that can stably form a shaped flat stranded wire into a shaped flat stranded wire having a large number of twists and a large aspect ratio. be.

Summary of the Invention The present invention provides an apparatus for manufacturing shaped rectangular stranded wire, characterized in that a pair of holding jigs are provided for pressing the flat surface of the stranded wire having an approximately rectangular shape from above and below on the upstream side of the tax roll. It is.

Effects of the Invention According to this invention, a pair of holding jigs are provided that press down the flat surface of the stranded wire from above and below before it enters the tax head roll, thereby preventing the strands from lifting up before entering the tax head roll. Therefore, stable rectangular molding can be performed. In addition, it has become possible to smoothly manufacture a shaped rectangular stranded wire with a large number of twists and a large aspect ratio without a core.

・Description of the Embodiment FIG. 11 is a diagram corresponding to the above-mentioned FIG. 8, and shows the characteristic portion of an embodiment of the present invention. In addition,
In FIG. 11, 11. shown in FIG. ．． ．． □5o, 3
Breasts, 6. . Ya9-1.9.1! has been done.

On the upstream side of the rolls 11 and 12 constituting the tax roll 7, a pair of holding jigs 14 are installed in order to press down the flat surfaces of the stranded wires 6 having an approximate rectangular shape from above and below. The surface of this holding jig 14, particularly the surface that comes into contact with the stranded wires 6, is made of a material such as L11 Teflon (trade name) or hard nylon, and is in a smooth state.

It is preferable that the holding jig 14 be provided as close to the roll 11.12 as possible. In particular, the holding jig 14 is designed to be able to press approximately the middle part between A and 8 of the strand 1a passing through point A, which is the contact start point between the side surface forming roll 11 and the stranded wire 6 having an approximately rectangular shape. is preferably provided. For example, when the number of twisted wires is 15 or more and the twist angle θ is 5° x θ x 25°, the holding jig 14 allows one strand 1a to be twisted on one flat surface.
It is arranged so that it can be pressed from the point [AB] cos θx (1/2>) to the side near the rad roll position when measured from point A. Here, [AB]
indicates the distance that one strand 1a extends on a flat surface.

Further, the width of the holding jig 14 may be selected so as to cover the entire width of the stranded wire 6 having an approximate rectangular shape, but at least
(1/4) times the width is sufficient.

Next, in order to confirm the effects of this invention, I will introduce the results of an experiment.

When 27 superconducting strands with a diameter Q of 7n+m and a Qu ratio of 2.0 were formed into rectangular strands using a conventional device as shown in Fig. 8, the wires came out of the twisting die 5 (Fig. 1). By the way, when the stranded wire 6, which has been twisted together in a rectangular shape, is formed in the tax head roll 7, the rectangular shape is lost at the entrance of the tax head roll 7, and the load of forming the wire at the entrance of the rad roll 7 to the tax becomes large, and the stranded wire This resulted in a disconnection.

Therefore, when we pressed the flat surface from above and below from the exit of the twisting die 5 to the entrance of the tax roll 7 using a pressing jig 14 whose contact surface was finished with Teflon, the tax head was smoothly held without any collapse of the rectangular shape. It was molded using roll 7.

In addition, although the above-mentioned embodiment explained the superconducting shaped rectangular stranded wire, it should be pointed out that the present invention is equally applicable to other general shaped rectangular stranded wires in general.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an outline of a manufacturing apparatus for forming flat stranded wire. FIG. 2 is a plan view showing the twisted wire 6 having an approximately rectangular shape after leaving the twisting die 5. FIG. FIG. 3 is a cross-sectional view of the stranded wire 6 of FIG. FIGS. 4 and 5 show a state in which the proper twisted state of the twisted wires 6 has been disrupted. FIG. 6 shows the arrangement of the tax head roll 7. FIG. 7 does not show a part of the rad roll 7 shown in FIG. 6 on an enlarged scale. FIG. 8 shows the operating state of the tax head roll 7 divided into a side surface molding roll 11 and a top and bottom surface molding roll 12. FIG. 9 is a cross-sectional view of the strand 1 for explaining the forming action by the tax head roll 7. FIG. 10 is a sectional view taken along line EF in FIG. 8. FIG. 11 is a diagram corresponding to FIG. 8, and shows characteristic parts of an embodiment of the present invention. In the figure, 1 and 1a are bare wires, 2 is a bobbin, 5 is a twisting die, 6 is a stranded wire with an approximate rectangular shape, 7 is a tax head roll, 8 is a forming flat stranded wire, 11 is a roll for forming side surfaces, 12 1 is a roll for molding the upper and lower surfaces, and 14 is a holding jig. (2 others)

Claims (6)

[Claims] (1) A stranded wire consisting of a plurality of strands twisted together without a core and pre-shaped into an approximate rectangular shape is passed through a tax head roll consisting of upper and lower and left and right roll pairs, and formed.
In the apparatus for manufacturing a shaped rectangular stranded wire to obtain a desired rectangular shape, a pair of pressing jigs are provided on the upstream side of the tax roll to press down the flat surface of the stranded wire having an approximately rectangular shape from above and below. This is a manufacturing device for forming flat stranded wire. (2) The number of twists is 15 or more, and the twist angle θ is 5.
6. The apparatus for producing a shaped rectangular stranded wire according to claim 1, wherein the angle is 6<0 x 25°. [A B ] From the point of cos θX (1/2) to the tax so that it can be held down to the side near the rad roll position,
The shaped rectangular twist according to claim 2, which is arranged.
manufacturing equipment. However, [AB] indicates the distance that one strand extends on a flat surface. (4) The apparatus for manufacturing a shaped rectangular stranded wire according to any one of claims 1 to 3, wherein the surface of the pressing jig is configured to have a smooth structure. (5) The width of the holding jig is 1 to (
1/4) times, Claims 1 to 4
An apparatus for manufacturing a shaped flat stranded wire according to any one of the items. (6) The apparatus for producing a shaped rectangular stranded wire according to any one of claims 1 to 5, wherein the shaped rectangular stranded wire is a superconducting shaped rectangular stranded wire.