JP4810388B2 - Twisted wire conductor and manufacturing method thereof - Google Patents

Description

  The present invention relates to a stranded wire conductor and a manufacturing method thereof, and more particularly to a stranded wire conductor used for an electric wire and the like and a manufacturing method thereof.

  Conventionally, the wire used as the base of the strand which comprises the stranded conductor used for an electric wire etc. is generally a round wire with a circular cross section, and is formed in the same diameter. As the wire, a copper wire is mainly used, and a copper wire plated with tin, nickel, silver, an aluminum wire, and various alloy wires are used.

  Conventionally, as a method for producing a stranded wire conductor having a hollow portion at the center, a method for producing a plurality of types of compression dies while twisting a plurality of wires arranged on the same circumference is known. (For example, refer to Patent Document 1). Hereinafter, this is referred to as Prior Art 1.

  In addition, as a method of manufacturing a stranded conductor having a hollow portion in the center, a manufacturing method is known in which a cross-sectional shape of a strand is formed by combining and twisting deformed strands formed into a fan-shaped shape in which a ring is divided into a plurality of rings. (For example, see Patent Documents 2 and 3). Hereinafter, this is referred to as Conventional Technology 2.

  In the stranded wire conductor of the prior art 1, there are problems that the manufacturing method is complicated and the manufacturing efficiency is poor by using a plurality of types of compression dies.

  Moreover, in the stranded wire conductor of the prior art 2, since it is necessary to prepare a deformed element wire for each type of the stranded conductor, the deformed element wire has no versatility, and the design and manufacture of the deformed element wire There is a problem that it takes time and cost, and the manufacturing cost becomes high.

Moreover, the manufacturing method of patent document 4 is known as a manufacturing method of the strand wire conductor which has a hollow part in the center part which solved said problem. Hereinafter, this is referred to as Conventional Technology 3.
Japanese Utility Model Publication No. 64-35615 Japanese Patent Publication No.61-9691 Japanese Examined Patent Publication No. 4-66952 Japanese Patent Laid-Open No. 11-25758

  In the stranded wire conductor of Prior Art 3, as the number of strands arranged on the same circumference increases, it becomes more difficult to form a cavity, and even if it can be formed, external stress from the outside of the stranded wire conductor However, since the hollow portion is easily crushed, it is a limit to arrange a maximum of 20 strands on the same circumference.

  In addition, there is a problem in that twisting back occurs due to the ease of slipping between adjacent lines, and the twist is opened.

This problem is considered to be caused by the following factors.
In the stranded wire conductor 101 of the prior art 3, since all the same wires are used, all the wires have the same physical characteristics and are formed by compression deformation with a compression die, as shown in FIG. The contact surface 103 between 102 and 102 has a planar shape as shown in FIG. Thus, when the contact surface 103 has a planar shape, a slip phenomenon is likely to occur at the contact surface 103 between the adjacent strands 102 and 102, and the shape of the hollow portion is likely to be crushed.

  In general, when the wire used for the stranded conductor 101 is the same material, the contact surface 103 between the adjacent strands 102 and 102 has a flat regular compression mark under a compressible compressibility. It becomes the form. In addition, the deformation state of the compressed portion of each strand 102 is uniformly dispersed as the number of constituents increases, and the number of contact portions decreases, so that a slip phenomenon occurs on the contact surface 103 between the adjacent strands 102 and 102. It is likely to occur and it will be difficult to construct a robust arch shape.

  Further, as the number of strands 102 arranged on the same circumference increases, the angle formed by the contact surfaces 103, 103 on both sides of the strand 102 becomes narrower and sharper. Further, since the compression marks are dispersed and lightened as the number of components increases, it is considered that a slip phenomenon between adjacent strands 102 and 102 is likely to occur.

  On the other hand, in the market, a hollow portion is stable and a twisted conductor has a large diameter. However, in the prior art 3, it is the limit to arrange 20 wires on the same circumference. I couldn't make something with a large caliber.

  Then, this invention aims at providing the strand wire conductor which solved the said problem, and its manufacturing method.

In order to solve the above-mentioned problem, the invention according to claim 1 is a twisted wire conductor in which a plurality of wires are twisted and compression-molded,
The outer layer is formed by alternately arranging two types of strands on the same circumference , forming a hollow portion inside the outer layer , and placing the outer circumference of one type of strand into the other type of strand. It is a stranded conductor characterized in that it is formed to be harder than the outer periphery of the wire and the outer periphery of one type of strand is bitten into the outer periphery of the other type of strand when compression molding is performed. .

The invention according to claim 2 is a twisted wire conductor in which a plurality of wires are twisted and compression molded,
The hollow portion is formed inside the outer layer, the outer layer, a hard line, constructed by arranging two strands of soft softer line than the rigid line alternately on the same circumference, and compression molded In this case, the stranded wire conductor is characterized in that a hard wire is bitten into a soft wire .

According to a third aspect of the present invention, in the stranded conductor according to the first or second aspect, the outer layer is composed of a single layer or a plurality of layers.

The invention according to claim 4 is the stranded conductor according to any one of claims 1 to 3 , wherein an inner layer made of one or a plurality of wires or fillers is disposed inside the outer layer , The inner diameter formed at the innermost end of the outer layer is larger than the outer diameter formed at the outermost end of the inner layer .

The invention according to claim 5 is a method of manufacturing a stranded wire conductor in which a plurality of wires are twisted and compression-molded.
Two types of wire rods are obtained by alternately arranging two types of wire rods whose outer peripheral portion of one type of wire rod is harder than the outer peripheral portion of the other type of wire rods on the same circumference and passing through compression dies. The outer periphery of one type of wire rods into the outer periphery of the other type of wire rod to form an outer layer having a hollow portion on the inside. Is the method.

The invention according to claim 6 is a method for producing a stranded wire conductor in which a plurality of wires are twisted and compression-molded.
The two types of wires are compressed from the outside by alternately disposing two types of wires, a hard wire and a soft wire softer than the hard wire, on the same circumference and passing through a compression die . It is a manufacturing method of a stranded wire conductor characterized in that an outer layer is bitten into an outer periphery of a soft wire to form an outer layer having a hollow portion inside .

The invention according to claim 7 is characterized in that, in the method for producing a stranded wire conductor according to claim 5 or 6 , the two kinds of wires are circular in cross section and all have the same diameter. To do.

Invention of Claim 8 is a manufacturing method of the strand wire conductor of any one of Claim 5 thru | or 7. WHEREIN: A single or multiple wire or a filler is put inside the wire which forms the said outer layer. Arranging and forming the inner layer through a compression die simultaneously with the wire constituting the outer layer,
The inner diameter formed at the innermost end of the outer layer is larger than the outer diameter formed at the outermost end of the inner layer .

  According to the present invention, the outer layer of the stranded wire conductor is composed of two types of strands having different hardness at the outer peripheral portion, so that one type of wire (hard wire) is compressed during compression in the manufacture of the stranded wire conductor. By biting into the other adjacent type of wire (soft wire), the contact surface between adjacent strands does not have a planar shape but a curved shape, like the stranded wire conductor 101 of the prior art 3. Thereby, it is difficult for a slip phenomenon to occur between the contact surfaces of adjacent strands (one type of strand and the other type of strand), and the stranded conductor is not easily crushed.

  Moreover, when it has a hollow part, the contact surface between adjacent strands becomes a curved surface shape, for example, one type of strand (hard wire) bites into the other type of strand (soft wire) which adjoins. As a result, the outer layer becomes a robust arch structure, and the hollow portion becomes stable.

  In addition, since the sliding phenomenon is less likely to occur between the contact surfaces of the adjacent strands than the stranded wire conductor of the prior art 3, twisting is less likely to occur, and the opening of the twist is less likely to occur. Can be formed.

  The best mode for carrying out the present invention will be described with reference to the drawings.

  1 to 4 show a first embodiment of the present invention. FIG. 1 is a cross-sectional view cut in a direction orthogonal to the axial direction of the stranded wire conductor 1, and the oblique lines indicating the cross-section of each element wire are omitted in order to avoid complication of the drawing.

  As shown in FIG. 1, the stranded wire conductor 1 is composed of only one outer layer 2, and a hollow portion 3 is formed inside the outer layer. The outer layer 2 is composed of 22 core wires 4, and the strand 4 is composed of 11 types of hard wires 5 and 11 types of soft wires 6 that are softer than the hard wires 5. That is, the strand 4 is composed of two types of strands having different hardness. The outer layer 2 is formed by alternately arranging the hard wires 5 and the soft wires 6 on the same circumference.

  Note that the wire 4, that is, the hard wire 5 a and the soft wire 6 a (see FIG. 4), which are the basis of the hard wire 5 and the soft wire 6, have a circular cross section (round shape) and all have substantially the same diameter. Is used. In Example 1, a tin-plated hard copper wire having a diameter of 0.1830 mm and an elongation rate of 2.0% at a tensile load of 1.18 kg is used as the hard wire 5a, and a diameter of 0.1830 mm is used as the soft wire 6a. Tin-plated annealed copper wire with an elongation of 22.5% at a load of 0.63 kg was used, but as before, copper wire, copper wire plated with nickel, silver, aluminum wire, and various alloy wires Can be used. Moreover, the relationship between the tensile load and elongation rate of the hard wire 5a and the soft wire 6a may be set arbitrarily, and the hard wire 5a and the soft wire 6a may be made of different materials.

Next, a method for manufacturing the stranded wire conductor 1 will be described.
The stranded wire conductor 1 is manufactured by using a stranded wire machine 10 having a wire collecting port 11 as shown in FIG. A compression die 12 is provided in the concentrating port 11, and an eye plate 13 is provided behind the concentrating port 11. In the eye plate 13, 22 wire passage holes 13 a are formed through a front and back of the eye plate 13 at predetermined intervals on a circle centered on the central axis of the compression die 12.

  First, the hard wire 5a is supplied from the hard wire supply unit 14 disposed behind the eye plate 13, and the soft wire 6a is supplied from the soft wire supply unit 15 to the wire passage hole 13a of the eye plate 13. At this time, the hard wire 5a and the soft wire 6a are alternately supplied to the 22 wire passing holes 13a in the circumferential direction.

  The hard wire 5a and the soft wire 6a that have passed through the wire passage hole 13a are gathered evenly in the center direction of the eyeplate, that is, in the center direction of the compression die 12.

  The collected hard wire 5a and soft wire 6a are supplied to the twisting machine 10. When the hard wire 5a and the soft wire 6a are supplied to the twisting machine 10, the lead wire 15 is simultaneously supplied so as to be positioned at the center of a circle formed by the hard wire 5a and the soft wire 6a.

  The lead wire 15 must have a diameter corresponding to the inner diameter of the hollow portion 3. Further, the length of the lead wire 15 is shorter than the length of the strand 4, and the material thereof is not limited, but it is desirable to use the same material as the hard wire 5a and the soft wire 6a.

  The hard wire 5a and the soft wire 6a are alternately arranged in the circumferential direction and pass between the lead wire 15 and the compression die 12, and are twisted in one direction by the twisting machine 10. In addition, although the compression rate by the compression die 12 ((1−inner diameter of compression die / outer diameter when wire rods are collected) × 100) is arbitrarily set, in Example 1, it was set to 11.5%. . Moreover, although the twist pitch at this time is set arbitrarily, in the present Example 1, it set to 7.8 mm.

  By the compression die 12 and the lead wire 15, the hard wire 5 a and the soft wire 6 a are compressed and deformed into the hard wire 5 and the soft wire 6 as shown in FIGS. Further, the hollow portion 3 is formed by twisting the hard wire 5 a and the soft wire 6 a around the lead wire 15. Even after the lead wire 15 no longer exists, the hard wire 5a and the soft wire 6a are continuously twisted in the state having the hollow portion 3, and the stranded wire conductor 1 is formed.

Next, the hard wire 5 and the soft wire 6 will be described.
2 is an enlarged cross-sectional view of the hard wire 5 obtained by untwisting the stranded wire conductor 1 of FIG. 1, and FIG. 3 is an enlarged cross-sectional view of the soft wire 6 obtained by untwisting the stranded wire conductor 1 of FIG.

  As can be seen from FIG. 2, the hard wire 5 maintains a round shape like the hard wire 5a although slight deformation is recognized. As is apparent from FIG. 3, the left and right sides of the soft wire 6, that is, the contact surface with the hard wire 5, are formed with recesses 6 b deformed by the hard wires 5 adjacent to the left and right. The concave portion 6b is formed by the hard wire 5 biting into the soft wire 6 when compressed by the compression die 12 when the stranded wire conductor 1 is manufactured due to the difference in plastic characteristics between the hard wire 5 and the soft wire 6. It is. Moreover, when the soft wire 6 was observed with the microscope, the compression mark received by the compression deformation was recognized.

  The hard wire 5 bites into the recesses 6b of the left and right soft wires 6, that is, the side portions of the hard wire 5 are fitted into the recesses 6b of the soft wire 6, so that the wire between the prior art 3 is planar. It forms a stronger arch structure than the one, the slip phenomenon hardly occurs between the contact surfaces of the hard wire 5 and the soft wire 6, and the stranded wire conductor 1 is hard to be crushed. In addition, since the slip phenomenon is difficult to occur, the hard wire 5 and the soft wire 6 are not easily twisted back, and the twisted line is less likely to open than in the prior art 3, and the shield form is more accurate than the stranded wire conductor in the prior art 3. Can do.

  As a result, in the twisted wire conductor in which the same strands are arranged on the same circumference in the prior art 3, 20 cores were the maximum, but as in the first embodiment, even 22 cores having a larger number of configurations than that. A stable stranded wire conductor 1 can be formed.

  In the first embodiment, the outer layer 2 is composed of eleven hard wires 5 and eleven core soft wires 6. However, the outer layer is composed of any number of hard wires 5 other than eleven and the same number of hard wires 5. In the same manner as in the first embodiment, the hard wire 5 and the soft wire 6 may be alternately arranged on the same circumference.

FIG. 5 shows an example showing the second embodiment. FIG. 5 is a cross-sectional view cut in a direction orthogonal to the axial direction of the stranded wire conductor 21, and the oblique lines indicating the cross section of each element wire are omitted in order to avoid complication of the drawing. Figure stranded conductor 21 shown in 5 is constituted by only the outer layer 22 of the first layer, constituted by a softer line 6 of the outer layer 22 10 Heart rigid lines 5 and 10 hearts.

The structure, configuration and manufacturing method other than those described above are the same as those in the first embodiment.
Also in the second embodiment, the same operations and effects as the first embodiment are achieved.

  In the first and second embodiments, the stranded wire conductor 1 is formed by only one outer layer, but two layers are formed by alternately arranging the hard wires 5 and the soft wires 6 on the same circumference. Alternatively, a plurality of layers such as three layers may be provided as the outer layer.

The structure, configuration, and manufacturing method other than those described above are the same as in the first and second embodiments.
Also in the third embodiment, the same operations and effects as the first embodiment are achieved.

  In the stranded wire conductor of Example 4, an inner layer formed of one or a plurality of wires is provided inside the outer layer of Examples 1 to 3.

  The diameter of the wire constituting the inner layer is arbitrarily determined, and may be the same as or different from the diameter of the wire constituting the outer layer. In addition, as the wire forming the inner layer, copper wire, copper wire plated with tin, nickel, silver, aluminum wire, various alloy wires can be used, and the same as the wire forming the outer layer A material may be used, and a different material may be used.

  The outer peripheral portion of the inner layer and a part of the inner peripheral portion of the outer layer are in contact with each other, but are not locked, and the inner layer can be easily removed. Further, when the stranded wire conductor is manufactured, the inner layer is not subjected to the pressure from the outer layer, and the wire constituting the inner layer is not compressed and deformed.

  FIG. 6 shows an example of the stranded wire conductor of the fourth embodiment. FIG. 6 is a cross-sectional view cut in a direction orthogonal to the axial direction of the stranded wire conductor 31, and the oblique lines indicating the cross section of each element wire are omitted in order to avoid complication of the drawing.

  The outer layer 32 of the stranded conductor 31 shown in FIG. 6 is composed of ten hard wires 5 and ten soft wires 6, and the hard wires 5 and the soft wires 6 are alternately arranged on the same circumference. Configured. That is, it is the same as the outer layer 22 of FIG.

  An inner layer 35 composed of seven inner layer wires 33 is disposed inside the outer layer 32, and the inner layer wire 33 has a diameter larger than the diameters of the hard wire 5 and the soft wire 6.

Next, a method for manufacturing the stranded conductor 31 will be described.
The stranded wire conductor 31 is manufactured by using a twisted wire machine 10 similar to that of the first embodiment and a grid plate 36 different from that of the first embodiment as shown in FIG. The eye plate 36 has 20 outer layer wire passing holes 36a at predetermined intervals on a circle centering on the center axis of the die 12, and the center axis of the die 12 is centered inside the outer layer wire passing hole 36a. Six inner layer wire passing holes 36b and one inner layer wire passing hole 36b in the central axis are formed through the front and back of the eye plate 36 at predetermined intervals on the circle.

  First, in the same manner as in the first embodiment, the hard wire 5a is supplied from the hard wire supply unit 14 disposed behind the plate 36, and the soft wire 6a is supplied from the soft wire supply unit 15 to the plate 36 and the twisting machine 10. Then, lead wires corresponding to the inner diameter of the outer layer 32 are simultaneously supplied to manufacture only the outer layer 32.

  After the lead wire disappears and the hollow portion starts to be formed inside the outer layer 32, the inner layer wire 33a is supplied from the inner layer wire supply portion 37 disposed behind the eyeplate 36 together with the supply of the hard wire 5a and the soft wire 6a. It supplies to the inner layer wire passage hole 36b. The supplied inner layer wire 33 a passes through the eye plate 36, and is then gathered evenly in the center direction of the eye plate 36, that is, the center direction of the compression die 12, and is supplied to the compression die 12. At this time, by supplying the inner layer wire 33a so as to be positioned inside the circle formed by the hard wire 5a and the soft wire 6a, the inner layer wire is disposed at the portion located in the hollow portion formed only by the outer layer 32. 33 a is supplied, and the inner layer 35 is formed by the inner layer wire 33 a inside the outer layer 32 to form the stranded conductor 31.

The configuration and manufacturing method other than those described above are the same as those in Examples 1 to 3.
Also in the fourth embodiment, the same operations and effects as the first embodiment are achieved.

Reference example 1

  The stranded wire conductor of Example 4 may be a stranded wire conductor in which the outer portion of the inner layer is locked to the inner periphery of the outer layer, although the outer portion of the inner layer is not locked to the inner portion of the outer layer.

In the stranded conductor of Reference Example 1 , the outer portion of the inner layer is locked to the inner portion of the outer layer. For example, in the compression process during manufacturing, the inner layer is affected by the compressive deformation of the outer layer, and the inner portion of the outer layer Since the outer portion of the inner layer is locked, the inner layer cannot be easily removed from the stranded conductor.

FIG. 8 shows an example of the stranded wire conductor of the first reference example . FIG. 8 is a cross-sectional view cut in a direction orthogonal to the axial direction of the stranded wire conductor 41, and the oblique lines indicating the cross section of each element wire are omitted in order to avoid complication of the drawing.

  The outer layer 42 of the stranded conductor 41 shown in FIG. 8 is composed of ten hard wires 5 and ten soft wires 6, and the hard wires 5 and the soft wires 6 are alternately arranged on the same circumference. Configured. That is, it is the same as the outer layer 22 of FIG.

  An inner layer 45 composed of seven inner layer wires 43 is disposed inside the outer layer 42, and the inner layer wire 43 has a diameter larger than that of the hard wire 5 and the soft wire 6.

In addition, the manufacturing method of this reference example 1 can be performed similarly to the said Example 4. FIG.
Structures and configurations other than those described above are the same as in the first to fourth embodiments.

Also in the present reference example 1 , the same operations and effects as in the first to fourth embodiments are obtained.

In the said Example 4 or the reference example 1 , although the inner layer was comprised with the wire, you may use a filler.

  The filler is preferably made of a softer material than the wire, and examples thereof include a linear material such as rubber and thread.

The method for disposing the filler in the outer layer can be performed in the same manner as in Example 4 or Reference Example 1 .

Structures and configurations other than those described above are the same as in the first to fourth embodiments.
Also in the fifth embodiment, the same operations and effects as the first to fourth embodiments are achieved.

In the said Example 1 thru | or 5 , the strand 4 which comprises the outer layers 2, 22, 32, 42 was comprised with the metal hard wire 5 and the soft wire 6 from which 2 types of hardness differed, ie, a strand As the wire used as the base of 4, two types of metal hard wires 5 a and soft wires 6 a having different hardnesses were used. However, one or both of the two types of wire rods are copper wires, copper wires plated with nickel or silver, aluminum wires or various alloy wires as core materials, and the core materials are coated with a polymer material. Two types of wires having different outer peripheral hardnesses may be alternately disposed on the same circumference by using a coated wire, and the outer layer of the stranded wire conductor may be formed. That is, as two types of wires having different outer peripheral portions, both of them may be covered wires, one wire may be a wire not covered with a covering, and the other wire may be used as a covered wire.

  As the covering material, for example, a synthetic resin such as fluororesin, polyvinyl chloride, polyethylene, or polypropylene, or a rubber material can be used.

FIG. 9 shows an example of the stranded wire conductor of the sixth embodiment. FIG. 9 is an enlarged cross-sectional view of a main part cut in a direction orthogonal to the axial direction of the stranded wire conductor 51, and the oblique lines indicating the cross section of each element wire are omitted in order to avoid complication of the drawing.

  The stranded wire conductor 51 is composed of only one outer layer 54, and the outer layer 54 is formed by alternately arranging two types of strands 52 and 53. The strand 52 is formed of a wire rod made of SUS304W1 having a diameter of 0.5 mm, and the strand 53 is made of a coated wire rod having a diameter of 0.5 mm in which a core material 53a made of SUS304W1 having a diameter of 0.3 mm is covered with a fluororesin 53b. The hardness is different between the outer peripheral portions of the strands 52 and 53, that is, the SUS304W1 in the outer peripheral portion of the strands 52, and the fluororesin in the outer peripheral portion of the strands 53.

  On the contact surface of the strand 53 with the adjacent strands 52, 52, a recess 53c deformed by the strand 52 is formed in the same manner as the recess 6b of the soft wire 6 of the first to sixth embodiments. The concave portion 53c is formed by deformation of the fluororesin 53b of the strand 53 when the strands 52 and 52 bite into the fluororesin 53b of the strand 53 during compression by the compression die 12 during manufacture of the stranded conductor 51. It has been done. The core material 53 a of the strand 53 is not deformed by the strand 52.

The two types of strands 52 and 53 can be used in place of the two types of strands 4 of the stranded conductors of Examples 1 to 5 , that is, the hard wire 5 and the soft wire 6.

Structures, configurations, and manufacturing methods other than those described above are the same as those in Examples 1 to 5 .
Also in the sixth embodiment, the same operations and effects as the first to fifth embodiments are achieved.

(A) is a cross-sectional view which shows the twisted-wire conductor of Example 1 in this invention, (b) is a principal part expanded horizontal view. FIG. 2 is an enlarged cross-sectional view of one hard wire obtained by twisting the stranded wire conductor of FIG. 1. The expanded sectional view of one soft wire which untwisted the twisted-wire conductor of FIG. The schematic diagram which shows the manufacturing method of the stranded wire conductor of Example 1 in this invention. The cross-sectional view which shows an example of the stranded wire conductor of Example 2 in this invention. The cross-sectional view which shows an example of the stranded wire conductor of Example 4 in this invention. The schematic diagram which shows the manufacturing method of the twisted wire conductor of Example 4 in this invention. The cross-sectional view which shows an example of the stranded wire conductor of the reference example 1 in this invention. The cross-sectional view which shows an example of the stranded wire conductor of Example 6 in this invention. The cross-sectional view which shows the strand wire conductor of the prior art 3. FIG.

1, 21, 31, 41, 51 Stranded wire conductor 2, 22, 32, 42, 54 Outer layer 3 Hollow part 4, 52, 53 Wire 5 Hard wire 5a Hard wire (wire)
6 Soft wire 6a Soft wire (wire)
35, 45 Inner layer

Claims (8)

It is a twisted wire conductor that is twisted and compression-molded on a plurality of wires,
The outer layer is formed by alternately arranging two types of strands on the same circumference , forming a hollow portion inside the outer layer , and placing the outer circumference of one type of strand into the other type of strand. A stranded wire conductor characterized in that it is formed to be harder than the outer periphery of a wire and the outer periphery of one type of strand is bitten into the outer periphery of the other type of strand when compression molded . It is a twisted wire conductor that is twisted and compression-molded on a plurality of wires,
The hollow portion is formed inside the outer layer, the outer layer, a hard line, constructed by arranging two strands of soft softer line than the rigid line alternately on the same circumference, and compression molded A stranded wire conductor characterized in that a hard wire is bitten into a soft wire .   The stranded wire conductor according to claim 1 or 2, wherein the outer layer is composed of a single layer or a plurality of layers. An inner layer made of one or more wires or fillers is disposed inside the outer layer, and the inner diameter formed at the innermost end of the outer layer is larger than the outer diameter formed at the outermost end of the inner layer. The stranded wire conductor according to any one of claims 1 to 3 , wherein the stranded wire conductor is large . A method of manufacturing a stranded wire conductor, in which a plurality of wires are twisted and compression molded,
Two types of wire rods are obtained by alternately arranging two types of wire rods whose outer peripheral portion of one type of wire rod is harder than the outer peripheral portion of the other type of wire rods on the same circumference and passing through compression dies. The outer periphery of one type of wire rods into the outer periphery of the other type of wire rod to form an outer layer having a hollow portion on the inside. Method. A method of manufacturing a stranded wire conductor, in which a plurality of wires are twisted and compression molded,
The two types of wires are compressed from the outside by alternately disposing two types of wires, a hard wire and a soft wire softer than the hard wire, on the same circumference and passing through a compression die . A method for producing a stranded wire conductor, wherein an outer layer is bitten into an outer periphery of a soft wire to form an outer layer having a hollow portion inside .   The method for producing a stranded wire conductor according to claim 5 or 6, wherein the two types of wires have a circular cross section and the same diameter. One or more wires or fillers are disposed inside the wire forming the outer layer, and the inner layer is formed through a compression die simultaneously with the wire constituting the outer layer,
8. The stranded wire conductor according to claim 5 , wherein an inner diameter formed at an innermost end of the outer layer is larger than an outer diameter formed at an outermost end of the inner layer . Production method.

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