JPH0151842B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a rectangular shape of a copper coated wire, a Cypronickel coated wire, a copper coated superconducting wire or a copper wire, an aluminum wire, and a plurality of round wires made by applying varnish coating, tape wrapping, etc. The present invention relates to an improvement in the manufacturing method of rectangular shaped stranded wires twisted together in a shape.

Conventionally, when producing the above-mentioned rectangular shaped stranded wire, first a cylindrical air-core stranded wire is formed from each element wire, and then this is biaxially rolled from the top, bottom, left and right using Turks head rollers. ing. In this method, the stranded wires introduced into the Turks head roller have a gap in the center, so they are likely to become untwisted, and there is a risk that each strand will cross multiple times and break during molding.

Further, as shown in FIGS. 5 and 6, the cylindrical air-core twisted wire 5 is
0 is introduced into the die 5 to perform the drawing process to increase the sum of contact arc lengths between each strand to prevent twisting.
In this case, since each strand is subjected to two rolling processes: drawing with a die and rolling with the Turks head roller 51, an excessive load acts on the superconducting wire etc. embedded in the strand, causing damage. It was dangerous.

This invention was made in order to eliminate the above-mentioned drawbacks, and it is possible to eliminate twisting and reliably prevent multiple crossings of each strand, and also to provide a superconducting wire embedded in the strands. The present invention provides a method for manufacturing rectangular shaped stranded wire that can be formed into a predetermined shape without damaging the wire.

In other words, the present invention introduces a plurality of round strands of wire unwound from a bobbin into the guide holes of a noose that rotates coaxially with the wire twisting machine, thereby maintaining the same circumferential shape until just before the strands are twisted together. Arranged in
Immediately after being led out from the nose, each strand is introduced into the conical introduction hole of the die, and twisted into a rectangular shape in a rectangular hole with a rectangular cross section connected to the introduction hole of the die. The rectangular stranded wire is rolled immediately after being led out from the die by a Turks head roller disposed close to an arcuate recess formed at the tip of the die.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a process diagram for explaining the method for manufacturing a twisted wire according to the present invention. A plurality of round wires 10 drawn out from a bobbin 1 of a wire twisting machine are introduced into guide holes 20 of a nose 2 that rotates coaxially with the wire twisting machine, and then passed through a die 3 continuously provided in the nose 2. is introduced into the conical introduction hole 30 of the die 3.
A rectangular hole 3 with a rectangular cross section is connected to the introduction hole 30 of
After the rectangular strands 11 are twisted together in a rectangular shape, the rectangular stranded wires 11 are rolled by Turks head rollers 4 disposed above, below, left and right of the tip of the die 3.

As shown in FIG. 2, the guide hole 20 of the nose 2 is formed to be inclined at a predetermined angle so as to converge toward a tapering conical introduction hole 30 formed at the rear end of the die 3. , and a protrusion 21 with a tapered end is formed at the tip of the nose 2 to restrict the round wire 10 led out from the guide hole 20 from the inside,
These guide holes 20 and protrusions 21 allow the wires 10 to be arranged on the same circumference until just before being twisted together, and are directly twisted in a rectangular shape within the rectangular hole 31 of the die 3. Further, as shown in FIG. 3, an arc-shaped recess 32 corresponding to the outer peripheral surface of the Turks head roller 4 is provided on the outer periphery of the tip of the die 3, and this recess 32 and the outer peripheral surface of the roller 4 are in close proximity. By arranging them so that the rolling portion of the Turks head roller 4 is close to the tip of the die 3. Therefore, the stranded wire 11 is rolled immediately after being led out from the die 3. Note that this die 3 is formed by a pair of upper and lower divided pieces.

In this way, the rectangular stranded wires 11 are directly twisted without forming air-core strands before the rolling process by the Turks head roller 4, and the strands 11 are twisted together from before each strand 10 is twisted until the rolling process is completed. During the twisting process, the nose 2, die 3, and Turk's head roller 4 are used to control and position the yarn.
Each strand 10 can be accurately twisted and formed into a predetermined shape. Therefore, when this stranded wire 10 is rolled by the Turks head roller 4, it is possible to reliably prevent each strand 10 from crossing multiple times and breaking. In addition, a rectangular shaped stranded wire having a loading ratio of about 80 to 95% can be produced in one rolling process using the rollers 4. Moreover, damage to the superconducting wire etc. embedded within the wire 10 can be reliably prevented.

Note that the inclination angle α of the guide hole 20 of the nose 2 is
It is desirable to set it within the range of 30° to 120°. That is, if the inclination angle α is smaller than 30°, there is a disadvantage that the horizontal length L of the guide hole 20 becomes longer and the device becomes larger.
This is because if the angle is larger than 120°, the introduction angle of the strands 10 is too steep and there is a risk of twisting disorder.

Further, the die 3 can be formed from an integral member, but if the die 3 is formed from a pair of upper and lower divided pieces as shown in the above embodiment, these pieces are separated at the start of operation. There is an advantage that the wire 10 can be introduced into the die 3, and workability is greatly improved. Furthermore, by configuring both the divided pieces to be pressed with a predetermined pressure from above and below, it is possible to apply an appropriate pressing force to the strands 10 that are twisted together in the die 3. The twisted wires 11 can be formed accurately.

The length H of the center of the conical introduction hole 30 formed in this die 3 is 5 of the diameter d of the wire 10.
It is desirable to set it to about 20 times to 20 times. That is, if the length H is less than 5 times the diameter d of the wire 10, there is a risk that the wire 10 cannot be positioned sufficiently and the twisting may be disordered, and the length H is less than the diameter d. This is because if it is 20 times or more, the total length of the dice 3 becomes too large, resulting in an increase in the size of the device. Furthermore, the rectangular hole 31 of the die 3 allows the stranded wire 11 to
It is necessary to press the strands 11 from above and below to mold them into a predetermined shape, and to restrict the strands 11 from escaping in the left-right direction, and the width W and depth D thereof are set as follows.

W=d×(N-2/2+√3)×K...(2) D=2d-G...(3) G=(0.1~0.5)×d...(4) In other words, the square hole 31 When the number N of the strands 10 is an odd number, the width W becomes the value shown in the above formula (1), and this value is the width (A+B) of the stranded wire 11 determined geometrically in Fig. 4a. is multiplied by a coefficient K determined by the rigidity of the wire 10.
In addition, when the number N of the strands 10 is an even number, the value is shown in the above formula (2), which is the value obtained by multiplying the width (C + 2B) of the stranded wire 11 found in Fig. 4b by the coefficient K. Become.

Note that the above numerical values A, B, and C are as shown below from the wire diameter d and the number N.

Moreover, if the value of the coefficient K is too small, the rectangular hole 31
The width W becomes too narrow and the strands 10 twisted together in the die 3 are strongly pressed from the sides, causing multiple intersections of the strands 10 and making it impossible to form the rectangular strands 11. In addition, if the value of the coefficient K is too large, the width W of the rectangular hole 31 becomes too large and the stranded wire 11 cannot be restricted in the width direction.
The twisted wire 11 cannot be formed into a predetermined shape. Therefore, it is desirable to set the value of the coefficient K to about 0.8 to 1.5, and this has been experimentally confirmed.

Further, the depth D of the rectangular hole 31 is set to a value obtained by subtracting the presser foot G from the height 2d of the stranded wire 11 as shown in the above equation (3), and this presser foot G is shown as the above equation (4). It is desirable to set the diameter d to about 0.1 to 0.5 times the diameter d of the wire 10. That is, if the presser foot G is less than 0.1 times the diameter d, the presser foot is insufficient and the strands 10 cannot be sufficiently pressed within the die 3, and the strands 1
1 cannot be formed into a predetermined shape, and if the presser foot G is more than 0.5 times the diameter d, a gap will be formed between the upper and lower divided pieces even if the upper and lower divided pieces are pressed with an appropriate pressure. This is because the strands 10 protrude from this gap, making it impossible to form a normal rectangular stranded wire 11.

A specific example in which a rectangular shaped stranded wire was manufactured by the manufacturing method according to the present invention will be described below. In other words, it consists of a multicore superconducting wire with a diameter d of 0.84 mm.
The 13 strands 10 are connected to the nose 2 with an inclination angle α of 90°.
After introducing into the guide hole 20, the horizontal part height H of the conical introduction hole 30 is 15 mm, and the width W of the rectangular hole 31 is 8.5 cm.
(K = 1.3) is guided to the Turks head roller 4 through the die 3 with a depth D of 1.3 mm (G = 0.38 mm), and the thickness
When a rectangular shaped stranded wire of 1.5 mm in width and 5.6 mm in width with a space factor of 85% or more was molded for 6000 m, multiple crossings and disconnections of the strands 10 did not occur at all.

As explained above, the present invention regulates each strand to be arranged on the same circumference until just before it is twisted, forms a rectangular stranded wire directly in the die, and this stranded wire is led out from the die. Since the structure is such that the strands are rolled by a Turks head roller immediately after the strands are stranded, rectangular formed strands of a predetermined shape can be manufactured without causing breakage due to twisting or multiple intersections. A rectangular shaped stranded wire having a predetermined stacking area can be manufactured by a single rolling process using rollers.
This has the advantage that damage to the superconducting wires etc. embedded in each strand can be prevented.

[Brief explanation of drawings]

Figure 1 is a process diagram showing an embodiment of this invention;
The figure is a partially enlarged sectional view showing the structure of the nose and die, Figure 3 is a partially cutaway perspective view showing the structure of the rear end of the die, and Figures 4a and b are the structure of the stranded wire after twisting and before rolling. 5 is a process diagram showing a conventional example, and FIG. 6 is a sectional view taken along the line - in FIG. 5. 1...Bobbin, 2...Knows, 3...Dice,
4...Turks head roller, 10...Round wire,
11... Twisted wire, 20... Guide hole, 30... Conical introduction hole, 31... Rectangular hole, 32... Recessed part.

Claims (1)

[Claims] 1. Multiple round wires unwound from the bobbin,
By introducing each strand into the guide hole of a noze that rotates coaxially with the wire twisting machine, each strand is arranged in the same circumferential shape until just before being twisted, and immediately after being led out from the above nose, each strand is inserted into the cone of the die. The strands are introduced into a rectangular hole with a rectangular cross section that is connected to the introduction hole of this die, and are twisted together in a rectangular shape, close to the arc-shaped recess formed at the tip of this die. 1. A method for producing a rectangular shaped stranded wire, characterized in that the rectangular stranded wire is rolled immediately after being led out from the die by a Turk's head roller arranged as follows.