JP3008687B2 - Method of manufacturing composite strand for overhead transmission line - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a composite strand for an overhead transmission line, which has excellent strength and can continuously produce a composite strand for an overhead transmission line having an arbitrary diameter.

[0002] It is generally known as a method for producing a composite element wire in which aluminum or an aluminum alloy is combined with silicon carbide fiber.
There are the following methods.

(1) A continuous casting method in which a short fiber dispersing material is added to a molten aluminum just before casting, and the molten metal is continuously formed into a composite wire and cast and rolled by a belt-and-wheel method or the like (Japanese Patent Laid-Open No. 181303/1990). No.).

(2) A metal foil or a thin plate is superimposed on a fiber, and a matrix is diffused and bonded to the fiber while applying pressure at a high temperature by a hot press.

(3) The molten metal is infiltrated between the aligned fiber bundles and cast at a high pressure.

(4) A copper wire is used as a seed wire, and the wire diameter is increased and drawn by continuously dip forming the copper wire.

(5) A copper wire is used as a core wire, and aluminum is coated by continuous extrusion to form an AS wire.

[0008]

However, the above-described method has the following problems.

(1) In the case of a continuous casting method using a belt-and-wheel method or the like, it is possible to manufacture a strand by rolling and drawing an ingot in which short fibers are combined.
When compounding long fibers, it is difficult to perform rolling and drawing of the composite material due to the stress-strain characteristics of the fibers (Japanese Patent Laid-Open No. 2-1).
No. 81301).

(2) A diffusion bonding method or a high pressure casting method using a hot press is effective when compounding short fibers. However, it is necessary to continuously produce a composite of long fibers (about 1000 m) and a matrix. It is difficult.

(3) In the case of continuous extrusion of aluminum using a steel wire as a core wire, the steel wire and the aluminum are not bonded, and the adhesive strength is low.

Accordingly, an object of the present invention is to provide a composite wire for an overhead transmission line which solves the above-mentioned problems, has excellent strength, and can continuously produce a composite wire for an overhead transmission line having an arbitrary diameter. It is to provide a manufacturing method.

[0013]

According to the present invention, there is provided a preform wire comprising aluminum or an aluminum alloy and long fibers, and a plurality of such wires are bundled.
Dip form with molten aluminum or aluminum alloy
The core wire is formed integrally by a rolling method, and the outer periphery of the core wire is coated with aluminum or an aluminum alloy by continuous extrusion.

[0014]

Further, in the present invention, a core wire is integrated by previously incorporating short fibers in a molten aluminum or molten aluminum alloy.

[0016]

According to the above construction, a preform wire is formed in advance from aluminum or an aluminum alloy and long fibers, and a plurality of the preform wires are bundled to form a molten aluminum or aluminum alloy.
By integrating the molten metal into a core wire by dip forming to improve the tensile strength in the longitudinal direction, continuous extrusion can be performed. Further, the adhesive strength with aluminum or aluminum alloy covering the outer periphery of the core wire is improved.

Furthermore, since the number of core wires and the thickness of the aluminum or aluminum alloy on the outer periphery can be arbitrarily adjusted, a composite strand having an arbitrary wire diameter can be formed.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a schematic view of an embodiment of a composite strand manufacturing apparatus to which the method for manufacturing a composite strand for an overhead transmission line according to the present invention is applied.

In the figure, a composite strand manufacturing apparatus is composed of Si
Supply roller 2 for supplying C / Al preform wire 1
And a processing device 3 arranged in front of the supply roller 2 (left side in the drawing) to collect and pretreat the preform wires 1 drawn from the supply roller 2, and a short fiber arranged in front of the pretreatment device 3 ( Or a crucible 5 containing a molten aluminum 4 containing whisker) and through which a pretreated wire 1a can pass, and a wire passing through a crucible 5 provided above the crucible 5 and covered with aluminum containing short fibers. Cooling system 6 for cooling the cooling wire 1b, and a cooled wire 1b provided on the cooling system 6
Roller 7 for folding back and aluminum (or aluminum alloy) around the wire 1b covered with aluminum including short fibers
And a winding roller 9 for winding the composite wire 1c for overhead power transmission lines.

The SiC / Al preform wire 1 is, for example, a long SiC wire (hereinafter, a long fiber) 1 having a diameter of about 0.5 mm.
0 is a long composite wire obtained by passing 0 through the molten aluminum layer.

Here, the composite strand 1 by the composite strand manufacturing apparatus is used.
The manufacturing process of c comprises a first step of passing the wire 1a into the crucible 5 and a continuous extrusion of aluminum or an aluminum alloy around the wire with the wire 1b subjected to the dip forming process in the first step as a core wire. It comprises a second step.

FIG. 2 is an explanatory diagram for describing the first step in detail.

In FIG. 1, a plurality (three in the figure) of preform wires 1 selected so as to have an arbitrary fiber volume ratio Vf are passed through a processing device 3 including a collecting portion 11 and a preprocessing device 12. They are bundled together and pass through the crucible 5. Around the crucible 5, a heater 13 for melting aluminum contained in the crucible 5 is provided. In this crucible 5, short fibers (or whiskers) are mixed with aluminum, and the strands 1 bundled together
When a is passed through the molten aluminum, a is integrated and short fibers adhere thereto. The wire 1b to which the short fibers are attached is cooled by a gas,
And becomes the central portion of the composite wire 1c for an overhead transmission line, and is wound up by the winding roller 15. That is, in the first step, an element wire as a core wire in which the long fiber 10 and aluminum are combined is formed at the center.

Here, since the wires 1b formed in the first step are integrated, the occurrence of variations in the wires 1b during the extrusion is suppressed.

FIG. 3 is an explanatory view of a continuous extruder used in the second step.

In FIG. 1, a continuous extruder 8 includes an insertion path 8a provided in the main body for inserting the element wire 1b, and an insertion path 8b provided on the upper and lower parts of the main body for inserting aluminum (or aluminum alloy). , 8c and these insertion paths 8a, 8
a melting portion 18 provided near the intersection where b and 8c intersect each other for melting aluminum; and rollers 16 and 17 provided near the melting portion 18 for coating the outer periphery of the wire 1b with the molten aluminum. And a die 18 for regulating the outer diameter of the aluminum-coated wire 1b, and a discharge path 8d for discharging the composite wire 1c.

That is, the insertion path 8a of the continuous extruder 8
The wire 1b formed in the first step is inserted into the wire 1b.
By coating the outer periphery of aluminum or aluminum alloy,
A composite strand 1c is formed as a final strand having a structure as shown in FIG. FIG. 4 is a sectional view of a composite strand formed by the apparatus shown in FIG. As shown in the figure, the composite strand is composed of three SiC / Al preform wires 1
Are twisted, the short fiber 19 is coated around the wire, and the outer periphery of the short fiber 19 is coated with aluminum 20.

Next, the operation of the embodiment will be described.

A preform wire 1 is formed in advance from aluminum or an aluminum alloy and long fibers 10, and a plurality of the preform wires are bundled to form a molten aluminum or an aluminum alloy.
By integrating the core wire with the molten metal by the dip forming method, the tensile strength of the preform wire 1 in the longitudinal direction is improved, and the preform wire 1 can be continuously extruded. Alternatively, the adhesive strength with aluminum or an aluminum alloy wound around the outer periphery of the core wire is improved. Furthermore, by adjusting the number of preform wires 1 and the size of the die, the diameter of the composite wire 1c for an overhead power transmission line can be adjusted to an arbitrary size.

As described above, according to the present embodiment, a preform wire made of aluminum or an aluminum alloy and long fibers is formed, and a plurality of the wires are bundled to form a molten aluminum or
Integrated by dip forming method with molten aluminum alloy
Since the core wire was coated with aluminum or an aluminum alloy by continuous extrusion, the composite wire for overhead power transmission lines having an arbitrary diameter and excellent in strength can be continuously manufactured.

In the first step, short fibers or whiskers are mixed in the crucible. However, the present invention is not limited to this, and short fibers or whiskers may not be mixed. The cross section in this case is as shown in FIG. That is, the composite strand has a structure in which three strands 1 are covered with the aluminum layer 20a, and the periphery of the aluminum layer 20a is covered with the aluminum 20.

In this embodiment, the composite wire for the overhead transmission line is formed in the first step and the second step. However, the present invention is not limited to this, and only the first step or the second step is performed. A composite strand for an overhead transmission line can be formed with only the above.

[0034]

In summary, according to the present invention, the following excellent effects are exhibited.

(1) Lightweight, low sag as overhead transmission lines,
The capacity can be increased, and the strands for fiber reinforced electric wires can be manufactured continuously.

(2) Preforms (plastic processing for preventing disintegration) during the manufacturing process of twisted wires and the like can be performed, and a strand having a structure in which aluminum is provided in the outer layer can be manufactured by placing the composite portion at the center. Become.

(3) At the start of production, S
The production efficiency is improved by using the iC / Al preform wire, and a composite strand having an arbitrary fiber volume ratio and an outer diameter can be obtained.

(4) Rolling and drawing after production are unnecessary, and by exchanging the die of the continuous extruder, it is possible to produce a composite strand having an arbitrary diameter.

(5) By integrating several preform wires by a dip forming method as a pretreatment for continuous extrusion, it is possible to prevent the preform wires from becoming uneven or deteriorating due to extrusion pressure. The bonding strength of the composite wire is improved, and furthermore, it is possible to manufacture a composite element wire in which the fiber is uniformly composited at the center.

(6) By performing aluminum coating on the aluminum layer of the preform wire, the adhesive strength between the core wire and the coating layer is improved.

[Brief description of the drawings]

FIG. 1 is a schematic view of an embodiment of a composite strand manufacturing apparatus to which a method of manufacturing a composite strand for an overhead transmission line according to the present invention is applied.

FIG. 2 is an explanatory diagram for describing a first step in the composite strand manufacturing apparatus shown in FIG.

FIG. 3 is an explanatory view of a continuous extruder used in a second step in the composite strand manufacturing apparatus shown in FIG.

FIG. 4 is a sectional view of a composite strand formed by the apparatus shown in FIG.

FIG. 5 is a cross-sectional view of a composite element wire formed when short fibers (or whiskers) are not mixed in the apparatus shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 SiC / Al preform wire 1a, 1b strand 1c Composite strand 2 Supply roller 3 Processing unit 4 Fused aluminum 5 Crucible 6 Cooling system 7 Roller 8 Continuous extruder 9 Winding roller 10 Long SiC wire (long fiber)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H01B 13/00 501 D07B 1/06 H01B 5/00-5/16

Claims (2)

(57) [Claims] 1. A preform wire comprising aluminum or an aluminum alloy and long fibers is formed, and a plurality of such wires are bundled.
Dip form with molten aluminum or aluminum alloy
A method for producing a composite strand for an overhead power transmission line, comprising: forming a core wire by integrating the core wire by a coating method; and coating an outer periphery of the core wire with aluminum or an aluminum alloy by continuous extrusion. 2. The method according to claim 1, wherein said molten aluminum or molten aluminum alloy is
Make sure that the core wire is integrated by incorporating short fibers in advance.
The composite strand for an overhead transmission line according to claim 1, wherein
Manufacturing method .