JPH0696832B2 - Stranding method for deformed wires - Google Patents

Description

TECHNICAL FIELD The present invention relates to a fan-shaped Al used for, for example, an optical composite overhead ground wire.
The present invention relates to a method of twisting a deformed element wire such as a covered steel wire on a center wire.

2. Description of the Related Art As a recent overhead ground wire, a high-strength conductive element wire such as an Al-covered steel wire or a high-strength aluminum alloy wire is twisted around the optical fiber unit as a center line to provide an optical transmission function. Optical composite overhead ground wire has been developed. In such an optical composite overhead ground wire, it is desirable to increase the cross-sectional area of the wire in order to obtain sufficient wire strength, and at the same time, to reduce the overall outer diameter from the viewpoint of resistance to wind. As shown in FIG. 7, by making the cross-sectional shape of each element wire 2 twisted around the optical fiber unit 1 into a fan shape, the overall cross-sectional outer shape is made to be a shape close to a perfect circle. In addition, by making the cross-sectional shape of each strand 2 fan-shaped in this way, the pressure from the surroundings given to the central optical fiber unit 1 by the bridge effect between adjacent strands 2 forming the twisted wire layer is relaxed. There are also possible effects. Here, the fan shape means a shape in which a portion sandwiched by two concentric circles is divided by a cutting line along the radial direction.

By the way, in the case of manufacturing an optical composite overhead ground wire by twisting the strands 2 made of an Al-covered steel wire or the like having the above-mentioned fan-shaped cross section around the optical fiber unit 1, the length of the overhead ground wire is not limited. Even at the position of, the phase of each strand 2 is relative to the twisted center wire (center line of the optical fiber unit 1) so that the concave curved surface 2A of each strand 2 faces and the convex curved surface 2B faces outward. Need to match. Therefore, generally, the strands 2 drawn from the bobbin without twisting are twisted on the outer circumference of the optical fiber unit 1. That is, for example, as shown in FIG. 8, a plurality of bobbins 3 for paying out the individual strands 2 to be twisted are arranged so that their axes are along the rotation circumference of the rotation frame 4 and the rotation center of the rotation frame 4. It is attached to the rotary frame 4 so as not to be able to rotate in a plane orthogonal to the, and while rotating the rotary frame 4 around the center line of the optical fiber unit 1, the strands 2 are respectively drawn out from the bobbins 3 and twisted together. Is done. In this case, although each bobbin 3 revolves around the center of the rotating frame 4,
Does not rotate in the plane orthogonal to the center of rotation of
Therefore, the phase of each strand with respect to the twisted center line is always maintained without twisting.

The Al-covered steel wire and high-strength Al alloy wire used for the above-mentioned optical composite overhead ground wire have much higher rigidity than the pure Al wire. Therefore, when twisting wires with irregular cross-sections such as Al-covered steel wires and high-strength Al alloy wires in a fan-shaped cross-section as described above, the springback of each wire causes the wires to come apart (raised and floated). There is a risk that the gap between them will open) or that the twisted wires will swell or rotate.
In particular, when twisted using an Al-covered steel wire, there is also a problem that the Al coating layer on the surface of each wire is damaged due to the dispersion of the wire, and the corrosion resistance of the wire is reduced.

To solve this problem, for example, JP-A-60-154829 is used.
As disclosed in Japanese Patent Laid-Open No. 60-154831 or Japanese Patent Laid-Open No. 60-154831, twisting is applied to each strand, and then twisted, and after twisting, heat treatment is performed to distort the strand (residual stress). There has been proposed a method of preventing the occurrence of springback by removing the. In addition, for example, JP-A-60-
As disclosed in Japanese Patent No. 154828, before twisting, each wire is spirally wound around a core material as a dummy different from the original center wire material in advance, and in that state, it is wound by a roller former or heat treatment. A method has also been proposed in which the strain of the wire is removed, and then the wire is removed from the core material as the dummy and twisted again on the center wire material. Further, for example, JP-A-60-15
After twisting each wire in advance as described in Japanese Patent No. 4828, a strain is removed by acting a roller former on each wire, and then each wire is twisted on the center wire. Is also proposed.

Problems to be Solved by the Invention The above-mentioned JP-A-60-154829 or JP-A-60-1548
In the method described in Japanese Patent No. 31, particularly in the case of an optical composite overhead ground wire, if heat treatment is performed after twisting, heat is also applied to the optical fiber unit, which causes a problem that the optical fiber is deteriorated by heat.

Further, in the method described in Japanese Patent Laid-Open No. 60-154828, since the strain of each strand is removed before twisting, the problem of deterioration of the optical fiber due to heat does not occur, but it is different before twisting. In the process, the process of winding around the core material as a dummy, the process of removing the strain on the dummy core material, and the process of removing it from the core material must be performed, which makes the process extremely complicated and significantly reduces the man-hours. As the number of facilities increases, the facility cost also increases significantly, so that there is a problem that practical use cannot be endured in terms of efficiency and cost.

Further, the method described in JP-A-60-154828 also requires a step of twisting the strands in a separate step before twisting and a step of removing the strain with a roller former. Therefore, the number of man-hours is large and the equipment cost is high, which is far from practical use.

This invention has been made in the background of the above circumstances, in twisting the deformed strands on the center line, without causing the inconvenience of each of the above-mentioned conventional examples, the variation of the strands due to the springback of the strands and It is an object of the present invention to provide a method for twisting a deformed wire in which rotation and undulation do not occur.

Means for Solving the Problems In the twisting method of the first invention of this application, in twisting a plurality of deformed element wires on a center wire, first, each deformed element wire is unwound from a bobbin or the like. Do without. Then, to each of the deformed strands that have been fed out, in order that the pitch of the residual twist in the state where the twist is returned by the springback expected after the twist becomes the same as the predetermined twist pitch, than the predetermined twist pitch. Twist is given at a short pitch (hereinafter, giving twist at a pitch shorter than the twisted pitch is referred to as overtwist). Further, before twisting the overtwisted strands, the twist of each deformed strand is returned by a twist amount (overtwist amount) corresponding to the twist return amount expected by the springback, and In this state, twist each strand on the center wire. That is, the twist for the overtwist is forcibly returned, and the twist is equivalent to the residual twist of the pitch equal to the predetermined twist pitch,
Twist in that state.

In the twisting method of the second invention, after overtwisting as in the case of the first invention, twisting back is caused by springback until twisting, and residual twist equal to a predetermined twisting pitch is generated. In this state, the deformed strands are twisted on the center wire in that state. That is, in this case, the twist of the overtwist is naturally returned before the twisting.

In the twisted wire method of the working first invention, for each of the plurality of deformed strands twisted or unwound as described above,
Overtwist so that the pitch of the residual twist becomes the same as the twist pitch when the twist is returned by the springback after twisting, and then the twist is returned by that overtwist (that is, the amount of twist returned by springback). Twisting after twisting means that the twisting back due to springback has already been completed before the twisting. Therefore, after twisting, the twisting back due to the spring back does not occur any more, and therefore, it is possible to effectively prevent the twisted twisted wires from being distorted, undulated, and rotated due to the spring back of the wires.

For example, if the twist amount commensurate with the twisting pitch is 100%, and if the twist back amount due to springback is expected to be 20%, if you perform overtwisting with a twist amount of 125%, the twisting after overtwisting Between 125
20% untwisting against 100% untwist
%, The twist amount corresponds to the twisting pitch, and twisting is performed in that state. This is the same as when the springback caused a twist return of 20%, so there is no springback in the twisted wire. If generalized, the amount of twist return due to springback is X
If it is expected to be%, the twist amount Y at the time of over twist
(%) May be Y = 1000 / (100−X). Of course, there may be some error in practice, and in practice, about 5% above and below the value of Y is allowed. That is, even with such an error, the pitch of the residual twist in the state where the twist is returned by the spring back after the twist can be regarded as substantially the same as the twist pitch. Note that the return amount of twist due to springback in the fan-shaped Al covered steel wire used for the optical composite overhead ground wire which is mainly targeted in the present invention is 20 to 30%.
Therefore, in this case, the twist amount at the time of overtwist may be about 125 to 140%.

In the method of the second invention, after overtwisting as in the method of the first invention, the twist of the overtwist naturally returns due to springback until the twisting, and the twisting is performed in that state. Also, as in the case of the first invention, springback does not occur in the twisted wire after twisting.

It should be noted that the above is the first step from the feeding of each wire to the twisting.
Both the invention and the second invention are carried out in one continuous process.

Example FIG. 1 shows an example of a situation in which the method of the first invention is being carried out, and FIGS. 2 (A), (B), (C) and (D) show the state at each stage.

In FIG. 1, a plurality of deformed strands 2 having, for example, a fan-shaped cross section are delivered from a plurality of bobbins 3 arranged at predetermined intervals along the circumferential direction of the first rotary frame 10. In FIG. 1, only one bobbin 3 is shown for simplification of the drawing. Here, each bobbin 3 has the
It is attached to the rotating frame 10 of. It is attached to the first rotating frame 10. A second rotary frame 11 arranged in series in front of the first rotary frame 10 in front of the first rotary frame 10.
The plurality of deformed strands 2 fed from the bobbin 3 in the first rotating frame 10 are separately wound around each of the plurality of sets of double capstans for regulating the position and posture of each strand 2.
Twelve (only one set is shown in the figure) are arranged at predetermined intervals in the circumferential direction. These double capstans 12 are configured so as to be able to rotate in the direction of reaction with the rotation direction (revolution direction) of the second rotary frame 11 in a plane orthogonal to the rotation center line of the second rotary frame 11. ing. Further, the third rotary frame 13 arranged in front of the second rotary frame 11 in series with the second rotary frame 11 includes a double capstan inside the second rotary frame 11.
A plurality of sets of double capstans 14 (only one set is shown in the figure) for circumferentially arranging the plurality of deformed strands 2 that have passed through 12 respectively to regulate their positions and postures are arranged at predetermined intervals in the circumferential direction. Are arranged. These double capstans 14 are also configured to be able to roll in a direction opposite to the rotation direction (revolution direction) of the third rotation frame 13 in a plane orthogonal to the rotation center line of the third rotation frame 13. Has been done. The rotating frames 10, 11, 13 are rotated in the same cycle, and as shown in the figure, the rotating frames 10, 11, 13 may be independently configured to rotate in synchronization with each other. Or each rotating frame 10,
You may comprise so that 11 and 13 may rotate integrally. Further, a twisting die 15 is arranged in front of the third rotary frame 13, and a winding drum 17 for winding the twisted wire 16 is arranged in front of the twisting die 15. ing.

An example of carrying out the twisting method of the first invention by using the apparatus as shown in FIG. 1 will be described below.

A plurality of deformed filament wires 2 such as fan-shaped Al-covered steel wires to be twisted are fed out from each bobbin 3 arranged on the first rotating frame 10, and, for example, a metal pipe or the like accommodating an internal optical fiber cable. Twisted center wire 18 from another bobbin 19 to each rotating frame 1
It is supplied so as to pass through the center positions of 0, 11, and 13. Here, the first rotating frame 10 rotates at a predetermined speed according to the twisting pitch and the rotating speed of the winding drum 17. On the other hand, since each bobbin 3 does not rotate in the plane orthogonal to the spring back center line of the first rotary frame 10 (that is, in the plane of rotation), each deformed element wire 2 is delivered without twisting. FIG. 1 (A) schematically shows the revolving state of the bobbin 3 and the phase of the deformed filament wire 2 having a fan-shaped cross section that is sent out in a plane orthogonal to the rotation center line 0 of the first rotary frame 10.

The deformed strands 2 fed from the bobbins 3 are wound around the double capstan 12 of the second rotary frame 11, respectively.
Here, the second rotary frame 11 rotates in the same direction in synchronization with or integrally with the first rotary frame 10 at the same rotational speed. Further, each double capstan 12 is rotated in the rotation plane of the second rotary frame 11 in a direction opposite to the rotation direction of the second rotary frame 11 at a rotational angular velocity exceeding the rotational angular velocity of the second rotary frame 11. Then, each twisted wire 2 is given an overtwist.

Here, when the double capstan 12 makes one rotation (360 °) of rotation for one rotation of the second rotating frame 11, the maximum rotation is 100.
% Twist, that is, 360 ° twist per 1 pitch of twisting, is given, but in the case of the present invention, it corresponds to 1 turn of the second rotary frame corresponding to the amount of twist return expected by spring back. Double capstan 12
It gives an overtwist by rotating it over 360 °. For example, when the twist return due to springback is expected to be 25%, the twist amount Y at the time of overtwist is required to be 133.3% (= 4/3) according to the above formula, so that one rotation of the second rotary frame 11 is required. For 360 ° × 4/3 = 48
A 0 ° rotation is given to the double capstan 12. The rotating state of the double capstan 12 in this case is schematically shown in FIG. 2 (B). FIG. 1 shows the situation in which one double capstan 12 revolves while revolving over time, together with the change in phase of the deformed strand 2 having a fan-shaped cross section wound around the double capstan 12. is there. In this way, the double capstan 1 is rotated by 480 ° per revolution of the second rotary frame 11.
By imparting to 2, the deformed strand 2 is given a twist of 480 °, and eventually it is overtwisted by 120 ° as compared with the case of 100% twist.

In this way, each deformed strand 2 to which the over-twist is given by the double capstan 12 of the second rotary frame 11 is
It is wound around the double capstan 14 of the rotating frame 13. The third rotary frame 13 rotates in the same direction as the first and second rotary frames 10 and 11 and rotates integrally with each other at the same rotational speed, and the double capstan 14 serves as the third rotary frame 13 of the third rotary frame 13. In the opposite direction to the rotation direction, one rotation of the third rotation frame 13 (360 rotations)
゜) Rotate. This situation is schematically shown in FIG. As can be understood by comparing FIG. 2 (C) with FIGS. 2 (A) and (B), it can be seen in relation to the deformed strands in a state of being drawn from the bobbin 3 of the first rotating frame 10. Third rotating frame 13
Double capstan 14's rotation and revolution will give you a total of 360
Although it is in a state where it is twisted in a degree of ゜, it is twisted only by the amount of over twist when viewed from the relationship with the deformed element wire in the state where over twist is given by the double capstan 12 of the second rotating frame 11. Is returned to a state in which a twist corresponding to the twisting pitch is given. That is, in the example where 480 ° overtwist is performed as described above, 1
The 20 ° twist will be returned. Here, the amount of twist return of 120 ° is equivalent to 25% against 480 °, so the amount of twist return expected by springback is 25%.
Is returned between the double capstan 12 of the second rotary frame 11 and the double capstan 14 of the third springback 13.

Next, each deformed wire 2 is a center wire rod in the twisting die 15.
Twisted on 18. At this time, the respective twisted strands 2 are already twisted in accordance with the twisting pitch, and therefore the twisted strands 2 are correctly twisted without losing the phase of each twisted strand 2. FIG. 2D shows the state of rotation of the deformed filament wire 2 at the inlet of the twisting die 15.

In addition, in the above embodiment, FIGS.
The rotation state of one bobbin 3 or one double capstan 12 or 14 in each rotating frame 10, 11, 13 is shown over time, but between the bobbin 3 and the double capstan 12, just in case All the bobbins, all capstans, and between the double capstan 12 and the double capstan 14 and between the double capstan 14 and the twisting die 15 are integer multiples of the twist pitch Fig. 3 (A)-
It shows in (D). However, FIG. 3 (D) shows a twisted state.

In the embodiment shown in FIG. 1, the double capstan of the third rotary frame 13 is made to facilitate the twisting of the respective deformed strands 2.
It is needless to say that a device for giving a winding pattern to each deformed element wire may be arranged between 14 and the twisting die 15.

FIG. 4 shows an example of a situation in which the method of the second invention is being carried out.

In the apparatus of FIG. 4, the third rotary frame in FIG.
It has the same configuration as the apparatus of FIG. 1 except that 13 and the double capstan 14 arranged therein are omitted. Even when the third rotary frame 13 and the double capstan 14 are omitted in this way, as in the case described above, the double capstan 12 of the second rotary frame 11 can be used to impart an overtwist to each deformed strand 2. For example, a twisted wire is returned from the second capstan 12 to the twisting die 15 due to overtwisting due to springback, so that a twisted wire in which twistback due to springback does not occur further can be obtained. However, if you want to naturally return the twist of the overtwist equivalent to springback,
It is desirable that the twisting die 15 reliably hold the posture of each deformed strand.

Also, as described above, the double capstan of the third rotating frame 13 is
When 14 is not provided, for example, as shown in FIGS. 5 and 6, the cross section of each deformed strand 2 is located at a position an integer multiple of the twisting pitch from the twisting position (that is, the inlet of the twisting die 15). Multiple perforated rolls or dies that closely match the shape 20
And the hole type roll or die 20 is attached to the fourth rotating frame 21, and the hole type roll or die 20 is rotated in synchronization with the revolution of the bobbin 2 or the double capstan 12. Then, the deformed element wires 2 may be passed through the hole-shaped roll or the die 20 to hold the deformed element wires 2 in the twisted position. In this case, the twist of the overtwist is returned between the double capstan 12 of the second rotary frame 11 and the hole type roll or die 20.

In the above explanation, each bobbin 3 and double capstan 1
2 and 14 are attached to a rotating frame and revolved, but in some cases, these are attached to a non-rotating frame, and a winding drum 17 for winding the twisted twisted wire is used as a reference for the twisting center line. It goes without saying that a so-called drum twister system in which the rotation is performed may be adopted. Also in this case, the double capstan 14 can be omitted in the same manner as described above, and in that case, the posture may be held by the hole type roll or the hole type die 20, and in the latter case, the hole type roll or the die 20 is provided at the fixed position. be able to.

Further, the specific means for giving the overtwist to the deformed strands 2 unwound from the bobbins 3 is not limited to the double capstan as described above, but has, for example, a spiral deformed groove. A method such as passing through a die may be applied. In this case, the die having the spiral irregular shaped groove may be fixedly attached to the second rotary frame 11. In each drawing, the case of twisting the deformed element wires having a fan-shaped cross section is shown, but it is needless to say that the present invention is also applicable to the case of twisting the element wires having other deformed shapes.

EFFECTS OF THE INVENTION As is apparent from the above description, according to the twisting method of the present invention, when twisting a plurality of odd-shaped strands on the center wire, the strands are separated by the springback of each strand after the stranding. There is no risk of waviness or rotation of the entire stranded wire,
Therefore, it is optimal for twisting deformed element wires having high rigidity, such as Al-covered steel wire and high-strength Al alloy wire, that is, wire elements with extremely large springback. In the case of Al covered steel wire,
There is no risk that the Al coating layer will be damaged by the dislocation of the strands after twisting, and therefore the corrosion resistance of the Al coating layer can be sufficiently maintained. Further, in the method of the present invention, it is not necessary to perform heat treatment for strain removal after twisting in order to prevent springback, so that a center wire material including a wire material such as an optical fiber cable which is easily deteriorated by heating, such as an optical composite overhead ground wire, is used. Even if it is used, there is no risk of deterioration of the optical fiber cable, etc. Furthermore, since the operation from feeding of each deformed element wire to twisting is performed in one continuous extremely simple process, high work efficiency and low equipment cost Therefore, the overall manufacturing cost of the stranded wire is significantly lower than that of the conventional method.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an example of a situation in which the method of the first invention is carried out, and FIGS. 2 (A) to (D) respectively show a bobbin or a double capstan at each stage in the method of FIG. The schematic diagram which shows the time-dependent rotation situation of a deformed strand in the surface orthogonal to the rotation center line 0, FIG. 3 (A)-(D).
FIG. 4 is a schematic view showing the situation of each bobbin or each double capstan and each variant wire at the same time in each step in the method of FIG. 1 in a plane orthogonal to their rotation center lines; FIG. 5 is a schematic diagram showing an example of a situation in which the method of the second invention is being carried out, FIG. 5 is a schematic diagram showing another example of an apparatus for carrying out the method of the second invention, and FIG. Arrow view
VI-VI front view, FIG. 7 is a cross-sectional view showing an example of an optical composite overhead ground wire, and FIG. 8 is an example of a conventional twisting method for twisting the optical composite overhead ground wire of FIG. It is a side view shown. 2 ... Deformed strand, 3 ... Bobbin, 10 ... First rotating frame,
11 …… Second rotating frame, 12 …… Double capstan, 13…
… Third rotating frame, 14 …… Double capstan, 15 …… Twisting die, 16 …… Twisted wire, 17 …… Winding drum, 18 …… Center wire.

Claims (2)

[Claims] 1. When twisting a plurality of deformed element wires on a center wire, each deformed element wire is delivered without twisting, and subsequently, each deformed element wire is twisted by a springback after twisting. So that the pitch of the residual twist in the returned state is the same as the predetermined twist pitch, twist is added at a pitch shorter than the predetermined twist pitch, and then the twist back amount due to the springback before twisting. The twisting method of the odd-shaped element wires, wherein the twist of each odd-shaped element wire is returned by an amount corresponding to the twist amount, and in that state, the respective odd-shaped element wires are twisted on the center wire. 2. When twisting a plurality of deformed element wires on a center wire, each deformed element wire is drawn out without twisting, and subsequently, each deformed element wire is twisted by a springback after twisting. Twisting is applied at a pitch shorter than the specified twisting pitch so that the residual twist pitch in the returned state is the same as the specified twisting pitch. A twisted wire method for a deformed element wire, characterized in that a residual twist having a pitch equal to a predetermined twisting pitch is provided, and each deformed element wire is twisted on the center wire in that state.