JPH0440809B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for manufacturing a compressed stranded wire having a layer of twisted wires having a fan-shaped (segment-shaped) cross section.

[Prior art and its problems]

Generally, when the outer diameter of the stranded wire is made small or when it is necessary to increase the strength against external pressure, a compressed wire having a twisted layer of strands with a fan-shaped cross section is used. An example is shown in FIG. This compressed stranded wire 11 is made by twisting a required number of strands 13 having a fan-shaped cross section around the outer periphery of an aluminum pipe 12. Each wire 13 has a steel core material 14 and an aluminum coating material 15
It is in the form of a composite wire consisting of. Such a compressed combustion wire 11 is used as an optical composite overhead ground wire by housing an optical fiber in an aluminum pipe 12, for example.

Conventionally, when producing compressed stranded wires as described above, the wires 16 having a fan-shaped cross section as shown in FIG. There is.

By the way, as mentioned above, composite wires containing a strong steel core material in the center have high rigidity, so in order to produce hard-stranded wires, it is necessary to untwist them using a planetary type wire twisting machine. Although it is preferable to twist the wire while twisting, it has been impossible to untwist the wire because the inner and outer surfaces are determined when the wire has a fan-shaped cross section. For this reason, conventionally, a rigid type wire twisting machine has been used to perform twisting without untwisting, and it is essentially difficult to produce tightly twisted wire with this method. .

In order to twist strands of fan-shaped wire as tightly as possible using a jet-type wire twisting machine, it is necessary to apply strong preforms and postforms, and to provide a strong guide on the pass line to suppress rotation of the strands. be. However, as mentioned above, when the covering material of the strands is made of low-strength aluminum or the like, it is easy to be damaged or deformed when strong force is applied, and there is a limit to how hard the wires can be twisted.

[Means for solving problems and their effects]

The present invention provides a method for producing compressed stranded wire that solves the problems of the prior art as described above, and its structure consists of a core material with high strength and a core material with high strength from each bobbin of a planetary type stranding machine. A composite wire with a fan-shaped cross section made of a small sheathing material is sent out, and the composite wire is used with a roller die before the twisting end to deform the cross-sectional shape of the sheathing material without changing the cross-sectional shape of the core material, and to separate the core material and the sheathing. The feature is that the materials are twisted together while being formed into a fan-shaped cross section without changing the total cross-sectional area of the materials.

Generally, when obtaining a wire with a fan-shaped cross section from a wire with a circular cross section by drawing with a roller die, if the wire is made of a single material, the cross-sectional area after processing will be smaller than the cross-sectional area before processing, and the required It is difficult to obtain a cross-sectional shape, and if the area reduction ratio is increased to obtain the desired cross-sectional shape, wire breakage is likely to occur. In the case of composite wires, most of the drawing tension is borne by the strong core material, and the cross-sectional shape of the sheathing material is deformed without deforming the cross-sectional shape of the core material, thereby changing the total cross-sectional area of the core material and sheathing material. The drawing process can be performed without any process. By doing so, it is possible to reliably form a sector-shaped strand with a high dimensional accuracy. Therefore, even if forming with a roller die and twisting are performed at the same time, compressed stranded wires having accurate cross-sectional shapes and cross-sectional areas can be efficiently produced without causing wire breakage. In addition, since a planetary type wire stranding machine is used to produce compressed stranded wire,
It becomes possible to produce compressed stranded wire with a hard twist.

〔Example〕

1 to 3 show one embodiment of the present invention. In FIG. 1, 21 is a planetary type wire twisting machine, 22 is its cage, 23 is a bobbin supported within the cage 22, 24 is a hollow shaft integrated with the cage 22, and 25 and 26 are fixed to the hollow shaft 24. 27 is a twisting spout, and 28 is a tightening skin. A large number of roller dies 29 are attached to the second face plate 26, as shown in FIG. These roller dies 29 are composed of a roller 30 and an upper roller 31 as shown in FIG. It has a groove 33 to These two rollers 30,3
By combining 1, fan-shaped die hole 3
4 is formed.

For example, an aluminum pipe 12, which is a central member of the twisted wire, is supplied from the rear of the planetary type wire twisting machine 21, and this aluminum pipe 12 enters the twisting port 27 through the hollow shaft 24. On the other hand, from each bobbin 23, composite wires 16 having a circular cross section consisting of a steel core material 14 and an aluminum coating material 15 as shown in FIG. Further, when passing through the second face plate 26, the roller duster 29 shapes the cross section into a fan shape. The steel core material 14 has extremely high strength compared to the aluminum sheathing material 15, so when the composite wire 19 is drawn through the roller die 29, the cross-sectional shape of the steel core material 14 remains unchanged, and only the aluminum sheathing material 15 has a cross-sectional shape. The shape can be deformed, but the processing is performed without changing the overall cross-sectional area. Therefore, the aluminum coating material 15 sufficiently spreads within the die hole 34 of the roller die 29, and a sector-shaped composite wire 13 having a constant cross-sectional area and accurate dimensions can be obtained. The formed composite wires 13 having a fan-shaped cross section are gathered at the twisting port 27, twisted on the aluminum pipe 12, and then
A compressed twisted wire 11 as shown in the figure is completed. This compressed stranded wire 11 is pulled in the direction of the arrow by a pulling machine (not shown).

By the way, in the planetary type wire twisting machine 21, the bobbin 23 is supported so as to revolve, for example, together with the cage 22, but not to rotate, so that the strands can be twisted. Even in such a configuration, twist is applied to the strands during twisting. However, this twist does not accumulate due to the twisting, and the twisting point 27
The twist at a certain position in front of is constant.
Therefore, the strand 1 having a sector-shaped cross section exits the roller die 29.
In order to twist the wires 13 together in a normal state without strain, the rotation of the wires 13 after exiting the roller die 29 must be 180°×
The twist opening 27 may be installed at a position that is n times larger. However, when the angle is 180° x an odd number, the inner and outer sides of the wire having a fan-shaped cross section are reversed, so it is necessary to replace the lower roller 30 and upper roller 31 in the above embodiment.

In the above embodiment, an aluminum pipe is used as the central member of the stranded wire, but other materials such as a solid wire or a stranded wire may also be used.

〔Effect of the invention〕

As explained above, according to the present invention, when forming composite wires having a circular cross section into a sector-shaped cross section and simultaneously twisting them together, the cross-sectional shape of the sheathing material can be changed using a roller die without deforming the cross-sectional shape of the core material. By deforming and drawing the composite wire without changing the total cross-sectional area of the core material and sheathing material, it is possible to reliably form a sector-shaped wire with high dimensional accuracy. Even if forming and twisting are performed simultaneously, compressed stranded wires having accurate cross-sectional shapes and cross-sectional areas can be efficiently produced without causing wire breakage. Furthermore, since the composite strands are twisted together while being untwisted using a planetary type twisting machine, there is an advantage that a compressed stranded wire with a tight twist can be produced.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing one embodiment of the compression stranded wire production method according to the present invention, Fig. 2 is a front view of a face plate used therein, Fig. 3 is a front view of a roller die, and Fig. 4 is a compression stranded wire manufacturing method. Cross-sectional view showing an example of stranded wire, No. 5
The figure is a sectional view showing a composite wire having a circular cross section. 11... Compression stranded wire, 12... Aluminum pipe, 1
3...Composite wire with fan-shaped cross section, 14...Steel core material, 1
5... Aluminum covering material, 16... Composite wire with circular cross section, 21... Planetary type wire twisting machine, 22... Cage, 23... Bobbin, 25... First face plate, 2
6...Second face plate, 27...Twist opening, 29...Roller die.

Claims (1)

[Claims] 1. From each bobbin of a planetary type wire twisting machine, a composite wire with a circular cross section consisting of a core material with high strength and a covering material with low strength is sent out, and the composite wire is cut into a cross section of the core material by a roller die before the twisting port. By changing the cross-sectional shape of the sheathing material without changing its shape, and without changing the total cross-sectional area of the core material and sheathing material,
A method for manufacturing compressed stranded wire, which is characterized by twisting the wire while forming it into a fan-shaped cross section.