JPH08264046A - Manufacture of stranded wire - Google Patents

Abstract

PURPOSE: To provide a stranded wire excellent in flexibility and having the outer periphery excellent in smoothness and circularity by twisting upper twisting strands on the upper layer of lower stranded wires twisted in advance while untwisting the lower stranded wires by a prescribed quantity. CONSTITUTION: Upper twisting strands 13 are twisted on the upper layer of lower stranded wires 10 twisted in advance while untwisting the lower stranded wires 10 by a prescribed quantity. The twisting pitch of the lower stranded wires 10 is made longer (coarser) when the lower stranded wires 10 are untwisted. The irregular state of the outer periphery of the lower stranded wires 10 is mitigated, the smoothness and circularity is increased, and the flexibility is increased. The smoothness and circularity of the outer periphery of upper stranded wires 12 twisted on the outer periphery of the lower stranded wires 10 is increased, and the flexibility of the whole stranded wires is increased. Since the lower stranded wires 10 are untwisted when the upper stranded wires 12 are twisted, the lower stranded wires 10 may have a short (fine) twisting pitch before they are inserted into a twisting machine. When the pitch of the lower stranded wires 10 is short, such problems are prevented that strands are dispersed or hooked on other objects when the lower stranded wires 10 are conveyed or handled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a stranded wire used for electric wires and the like.

[0002]

2. Description of the Related Art Conventionally, as a twisted wire, a uni-ray concentric type as shown in FIG. 3 and a true concentric type as shown in FIG. 4 are known.

As shown in FIG. 3, the uni-ray concentric type spirally winds a large number of strands 2 around a center line 1 in a predetermined direction B to form a circle around the center line 1. Box,
A second layer that surrounds the outer periphery of the first layer in a circular shape by spirally winding a larger number of strands 3 around the outer periphery of the first layer in the same twist pitch as in the first layer and in the same twist direction B. And a necessary number of layers having the same twist pitch and the same twist direction B as described above are further provided on the outer periphery of the second layer.

The true concentric type is shown in FIG.
As shown in FIG. 1, one or a plurality of layers composed of a large number of strands 2 and 3 are provided on the outer periphery of the center line 1 as in the case of the Uniray Concentrate type. The twist direction is reversed (when the lower layer twist direction is the A direction, the upper layer twist direction is the B direction), and the twist pitches are the same.

These are one type of concentric twisted wire, and have excellent characteristics as compared with the collective twist and rope twist which are generally multi-core twisted wires.

[0006]

In the above-mentioned UNIRAY CONCENTRIC type, each layer has the same twist pitch and the same twist direction, so that the wires of the upper layer fall into the twist of the lower layer. There is a problem that the arrangement of the wires is broken, and the outer surface of the twisted wire formed by the assembly of the uppermost layer of wires has large irregularities, thereby impairing the roundness and smoothness of the surface. The collapsed state of the arrangement of the strands is shown in FIG. This Figure 5
(B) is a drawing of a cross-sectional photograph of an actually twisted stranded wire as it is.

Further, since the lower layer strands (eg, the strands of the first layer) are generally twisted at a fine twist pitch, the whole twisted strands are easily stiffened and a twisted strand having excellent flexibility is formed. There are also problems that are difficult to address.

The true-concentric type is superior to the UNI-RAY concentric type in roundness and smoothness, but since the twisting pitch of the lower layer wire is fine, the rigidity of the whole stranded wire is improved. For the same problem occurs.

Therefore, an object of the present invention is to provide a manufacturing method for manufacturing a stranded wire having a high roundness, an excellent flexibility and a smooth surface.

[0010]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems. According to the invention of claim 1, the lower twisted wire (10) is provided on the upper layer of the lower twisted wire (10) which is twisted in advance. ), The twisted wire (13) for the upper twisted wire is twisted around while returning the twisted amount by a predetermined amount.

In the present invention, the twisting pitch of the lower twisted wire (10) becomes longer (rougher) by untwisting the lower twisted wire (10). Therefore, the unevenness of the outer peripheral surface of the lower twisted wire (10) is relaxed, the smoothness and roundness thereof are enhanced, and the flexibility is also enhanced. Therefore, the smoothness and roundness of the outer circumferential surface of the upper twisted wire (12) twisted around the outer circumference of the lower twisted wire (10) are improved, and the flexibility of the entire twisted wire is also increased.

In addition, as described above, when the upper twisted wire (12) is twisted, the lower twisted wire (10) is untwisted. The lower twisted wire (10) before being put into the twisting machine has its twist pitch. A short (fine) one is acceptable. Therefore, if the lower twisted wire to be used has a long twist pitch (rough), there is a problem in that when the lower twisted wire is transported or handled, the strands of the lower twisted wire tend to be scattered or caught by other objects. However, as described above, when the twist pitch of the lower twisted wire used is short, such a problem disappears.

According to the second aspect of the present invention, a pre-twisted lower twisted wire (10) and a strand (13) for the upper twisted wire (12) twisted around the outer circumference of the lower twisted wire (10). Is put into the twist buncher machine (20), the rotor (22) of the twist buncher machine (20) is rotated in the direction opposite to the twisting direction of the lower twisted wire (10), and the lower twisted wire (10) is While twisting back a predetermined amount, the strand (13) of the upper twisted wire (12) is twisted into the lower twisted wire (1).
A twisted wire manufacturing method is characterized by twisting in a direction opposite to the twisting direction of 2).

Also in this invention, the same effect as that of the invention of claim 1 is exhibited. Further, in the present invention,
It is possible to easily untwist the lower twisted wire (10) using a twist buncher machine.

Further, since the lower twisted wire (10) and the upper twisted wire (12) are twisted in opposite directions, the upper twisted wire (12)
Between the strands (13) of the lower twisted wire (10) and the strands (13) of the upper twisted wire (12) between the strands (11) of the lower twisted wire (10). I'm not depressed. Therefore, the smoothness and roundness of the outer circumference of the upper twisted wire (12) are further enhanced.

[0016]

EXAMPLE First, a twisted wire manufactured by the method for manufacturing a twisted wire of the present invention will be described with reference to FIG.

Reference numeral 10 is a lower twisted wire (lower layer wire) of a multi-core twisted wire (multi-wired twisted wire) formed by twisting a large number of strands 11 in one direction A and bundling them in a perfect circle shape. The twist pitch of the wire 11 is set large (roughly).

Reference numeral 12 denotes an upper stranded wire (upper layer wire) obtained by twisting a large number of strands 13 around the lower stranded wire 10 in a spiral shape so as to surround the lower stranded wire 10. 13 is a direction B in which the twisting direction is opposite to the strand 11 of the lower twisted wire 10.
And, it is twisted with a small (fine) twist pitch. The lower twisted wire 10 and the upper twisted wire 12 form a twisted wire 14.

Next, an example of manufacturing the stranded wire shown in FIG. 1 using a double twist buncher machine will be described with reference to FIG. An outline of the double twist buncher machine used is shown in Fig. 2 (a). In the figure, reference numeral 20 is a main body of the double twist buncher, and a wire collecting port 21 is provided on the twisted wire input side. Reference numeral 22 denotes a rotor that rotates about the axis of the above-mentioned concentrating port 21. For example, when inserting a lower twisted wire twisted in the Z (left) direction, the S (right) direction (the rotor in FIG. 2). The upper part of 22 rotates to the front of the paper). Reference numeral 23 is a first guide roller whose tangent line is the concentrator 2.
It is located on the axis of No. 1 and revolves with the rotor 22 to form the first twisted point portion D. A second guide roller 24 revolves around the rotor 22.

Reference numeral 25 denotes a third guide roller, the tangent line of which is located on the rotation axis of the rotor 22.
It is equipped so that it can rotate without revolving with
It constitutes the twisted portion E. 26 is a capstan, 2
Reference numerals 7 and 28 are guide rollers, and 29 is a winding bobbin, which rotate together with the rotor 22 without revolving.

The rotor 22 and the winding bobbin 29 are rotationally driven by a drive motor (not shown). Next, the twisting operation will be described.

For example, 28 pieces of tin-plated copper wires 11 having a diameter of 0.180 mm are used, and the wires 11 are twisted in the Z (left) direction at a twist pitch of 20 mm and bundled. The lower twisted wire 10 is used, and the lower twisted wire 10 is put into the wire collecting port 21 of the double twist buncher machine 20 in a wound state.

Also, 22 pieces of tin-plated copper wires 13 having a wire diameter of 0.180 mm were used, and these were used as the above-mentioned twisted wire 1
Double twist buncher machine 20 located on the outer periphery of 0
It is put in the concentrating port 21 of.

While rotating the rotor 22 in the S (right) direction at a predetermined rotation speed, the lower twisted wire 10 and the upper twisted wire 13 are connected to the first guide roller 23 and the rotor 22 part. ,
After passing through the second guide roller 24 and the third guide roller 25, and further wound around the take-up captan 26, it is wound around the take-up bobbin 29 at a predetermined speed through the guide rollers 27 and 28.

As a result, the individual strands 13 for the upper twisted wire at the first twist point D of the first guide roller 23 are attached to the outer circumferential surface of the lower twisted wire 10 which is twisted in the Z (left) direction by S (right). ) Wrapped with direction twist. Further, at this time, since the twist in the S (right) direction is applied to the lower twisted wire 10 twisted in the Z (left) direction, the twist of the lower twisted wire 10 is returned by a predetermined amount, and the twist in the Z (left) direction is reduced. The twist pitch becomes longer (rougher). The twisted state of the twisted wire in this portion is shown in FIG. In the figure, F indicates the traveling direction of the twisted wire.

Furthermore, also in the second twisted portion E of the third guide roller 25, the strand 13 for the upper twisted wire is twisted in the S (right) direction with respect to the lower twisted wire 10, and the strand The twist pitch of 13 becomes even shorter (thinner). Further, at this time, since the twist in the S (right) direction is applied to the lower twisted wire 10, the lower twisted wire 1
0 twist is further untwisted than the first twist point E, and Z
The twist pitch in the (left) direction becomes longer (rougher). The twisted state of the twisted wire in this portion is shown in FIG. In the figure, F
Indicates the traveling direction of the twisted wire.

Actually, the lower twisted wire 10 having a twist pitch of 20 mm is twisted in the Z (left) direction by the double twist buncher machine 2
2 so that the strand 13 for the upper twisted wire is finally twisted in the S (right) direction with a twist pitch of 25 mm at the second twist point E formed by the third guide roller 13. Rotor 2
As a result of manufacturing the twisted wire by rotating 2 the twist in the Z (left) direction, the twist pitch is 100 mm, and the S
By twisting in the (right) direction, an upper twisted wire (upper layer wire) 12 having a twist pitch of 25 mm was obtained.

The final (final) pitch Y of the lower twisted wire 10
Is calculated by the following twist calculation formula in the relation between the twist pitch (A) of the lower twisted wire 10 and the finishing (final) pitch B of the upper twisted wire 12 before the charging.

Y = A × B / A + B where Z (left) twist is a minus (-) value and S (right)
The twist is a plus (+) value.

Therefore, in the case of the above pitch number, (−20) × (+25) / (− 20) + (25) = − 5
00/5 = -100, and the finishing (final) pitch of the lower twisted wire 10 is Z (left)
The twist pitch is 100 mm in the direction.

Although the above has described the method of manufacturing a twisted wire using the double twist buncher machine, in the case of a single twist buncher machine as well, the lower twisted wire bundled by previously twisting in the Z (left) direction as described above is bundled. 10 is put into the single twist buncher machine, and the strand 13 for the upper twisted wire is placed at the outer peripheral surface of the lower twisted wire 10 in the same manner as above, and the rotor of the single twist buncher machine is put in the S (right) direction. By rotating the wire 13 at one twist point (corresponding to the first twist point D in FIG. 2), the wire 13 is wound around the outer circumference of the lower twisted wire 10 in the S (right) direction and Twisting in the S (right) direction is applied to the twisted wire 10, and the lower twisted wire 10 is untwisted. Therefore, even with this single twist buncher machine, the lower twisted wire 10 having a twist pitch similar to the twist pitch of the upper twisted wire is thrown in, and the twist pitch of the finished lower twisted wire 10 is changed to the upper twisted wire 12. It can be much larger than the twist pitch.

In the double twist buncher machine, the upper twisted wire 12 can be twisted and the lower twisted wire 10 can be untwisted at two locations, so that the same twisted wire can be obtained compared to the single twist buncher machine. The productivity can be improved by increasing the moving speed of the rotor and the rotating speed of the rotor. Therefore, it is more effective to use a double twist buncher machine.

Next, the function of the twisted wire that has been twisted as described above will be described. Generally, in a multi-core stranded wire (a multi-core stranded wire) in which a large number of strands are bundled, such as the lower stranded wire 10 described above, the outer peripheral surface in the bundled state is likely to be uneven and When the pitch is made smaller, the unevenness of the outer peripheral surface becomes more prominent, and it tends to be rigid, and the flexibility is impaired.

On the other hand, by increasing the twist pitch of the lower twisted wire 10 of the multifilamentary twisted wire as in the above embodiment, the unevenness of the outer circumferential surface of the lower twisted wire 10 is relaxed and smoothed. Sex and roundness are increased. Furthermore, the flexibility of movement of the strands 11 is enhanced to enhance flexibility, and the strands 11 are easy to fit in. This familiarity is more favorably achieved by using a double twist buncher machine or a single twist buncher machine in which the upper twisted wire is twisted while untwisting the lower twisted wire.

Therefore, when an upper twisted wire is twisted around a lower twisted wire having a large number of cores, in the case where the lower twisted wire of the lower twisted wire has a small twist pitch as in the prior art, the influence of the unevenness also affects the upper twisted wire. It appears remarkably and inevitably has large irregularities on the outer peripheral surface, impairs circularity, and forms a stranded wire with high rigidity.

On the other hand, in the case where the twist pitch of the lower twisted wire 10 is increased as in the present invention, the lower twisted wire 10 is
Since the smoothness, roundness and flexibility of
Even if the twist pitch is small, the smoothness of the twisted wire,
Roundness and flexibility are inevitably high.

Further, the twist pitch of the upper twisted wire 12 is set to the lower twisted wire 10
Since the twist pitch is smaller than the twist pitch of No. 1, even if the twist pitch of the lower twisted wire 10 is large, the upper twisted wire 12 maintains the shape of the twisted wire in a good shape. Furthermore, since the twisting directions of the lower twisted wire 10 and the upper twisted wire 12 are made opposite to each other (reverse direction), these strands 11 and 13 cross each other, and the strand 13 of the upper twisted wire 12 is lowered. It does not fall into the twist between the strands 11 of the twisted wire 10.
Therefore, the upper twisted wire 12 can be wound around the outer circumference of the lower twisted wire 10 in a perfect circle, and in combination with the above-described twist pitch state, a twisted wire having more excellent smoothness and roundness can be obtained.

FIG. 5 (a) is a diagrammatic representation of a cross-sectional photograph of a twisted wire actually twisted by the manufacturing method of the present invention. According to this FIG. 5 (a), compared with the conventional one of FIG. 5 (b),
It can be seen that the outer peripheral surface of the twisted wire 14 has excellent smoothness and roundness.

The present invention is not limited to the above embodiment. That is, the wire diameter and the covering material of each of the strands 11 and 13 are selected as desired according to the intended use, and the number of wires used is also selected as desired according to the diameter of the stranded wire. Further, the twist pitch of the lower twisted wire 10 and the twist pitch of the upper twisted wire 12 are not limited to the numerical values of the above-mentioned embodiment as long as the former is larger than the latter.

Further, the lower twisted wire 10 may be twisted in the S (right) direction and the upper twisted wire 12 may be twisted in the Z (left) direction. According to the result of actual twisting and use, a good result was obtained when the twist pitch of the lower twisted wire 10 was 30 mm or more. Therefore, the twist pitch of the lower twisted wire 10 is preferably 30 mm or more.

Further, in the above embodiment, the lower twisted wire 10 is composed of a multi-core twisted wire.
The concentric stranded wire described above may be used, and this concentric stranded wire can also obtain the same operation and effect as above.

[0042]

As described above, according to the first aspect of the present invention, it is possible to manufacture a stranded wire having an outer peripheral surface excellent in smoothness and roundness and having high flexibility.

Moreover, since the twist pitch of the lower stranded wire before the upper stranded wire is twisted can be shortened (thinned), when the lower stranded wire is transported or handled, the strands of the lower stranded wire are caught or other objects are caught. There is no obstacle.

According to the second aspect of the invention, the twisted buncher machine can be used to easily untwist the lower twisted wire,
A stranded wire having the above effect can be easily manufactured. Moreover,
It is possible to manufacture a twisted wire with higher smoothness and roundness.

[Brief description of drawings]

FIG. 1 schematically shows a stranded wire manufactured according to the present invention, in which (a) is a side view and (b) is a cross-sectional view taken along the line CC in (a).

FIG. 2A is a schematic side view illustrating a manufacturing method of the present invention using a double twist buncher machine, and FIG.
The figure which shows the state of the twisted wire in the twist point part A, (c) is a figure which shows the state of the twisted wire in the 2nd twist point part B.

3A and 3B schematically show a conventional uni-ray concentric stranded wire, in which FIG. 3A is a side view and FIG. 3B is a sectional view taken along line DD in FIG.

FIG. 4 schematically shows a conventional true-concentric twisted wire, in which (a) is a side view and (b) is a sectional view taken along line EE in (a).

FIG. 5 is a diagram showing a photograph of a cross section of an actually twisted twisted wire, (a) showing a twisted wire manufactured by the present invention, and (b) showing a conventional twisted wire.

[Explanation of symbols] 10 ... lower twisted wire 12 ... upper twisted wire 11, 13 ... strands 20 ... double twist buncher machine 22 ... rotor 23 ... first twisting roller 24 ... second twisting roller

Claims (2)

[Claims] 1. A method for producing a twisted wire, which comprises twisting an element wire for an upper twisted wire while returning a predetermined amount of twist of the lower twisted wire to an upper layer of the previously twisted lower twisted wire. 2. A pre-twisted lower twisted wire and an upper twisted wire twisted around the outer circumference of the lower twisted wire are put into a twist buncher machine, and a rotor of the twist buncher machine is twisted into the lower twisted wire. The twisted wire is characterized by rotating in a direction opposite to the twisting direction of the lower twisted wire and twisting the lower twisted wire back by a predetermined amount, and twisting the element wire of the upper twisted wire in a direction opposite to the twisted direction of the lower twisted wire. Manufacturing method.