JP2007277637A - Aluminum for electric use, method for recycling aluminum wire, and electric wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an aluminum for electric use, which can maintain practically sufficient characteristics even though a content of zinc exceeds a conventional target management level and can be recycled; an electric wire using the same; and a method for recycling an aluminum wire. <P>SOLUTION: The aluminum for the electric use has a component ratio comprising 0.10 mass% or less Si, 0.25 mass% or less Fe, 0.005 mass% or less Cu, 0.005 mass% or less Mn, 0.005 mass% or less in total of Ti and V, 0.01 to 0.05 mass% Zn, and the balance aluminum with unavoidable impurities. A steel-cored aluminum stranded wire 10 is manufactured by the steps of: preparing hard aluminum base wires 5a and 5b by using the aluminum for electric use; preparing a steel core part 3 by stranding 6 galvanized steel wires 1b having a circular cross-section around a similar galvanized steel wire 1a; and stranding 10 hard aluminum base wires 5a having a circular cross-section around the steel core part 3, and further stranding 16 similar hard aluminum base wires 5b around the hard aluminum base wires 5a to form an aluminum part 7. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to electrical aluminum, a method for reusing aluminum wires (hereinafter referred to as aluminum wires), and electric wires. In particular, even if the content of zinc (Zn) exceeds the conventional target management level, the characteristics are practically sufficient. The present invention relates to an electrical aluminum that can be maintained, a method for reusing an aluminum wire, a method for reusing an aluminum wire constituting a steel core aluminum stranded wire of a removed transmission line, and an electric wire using the same.

Conventional overhead transmission lines mainly use steel core aluminum stranded wires (ACSR).
FIG. 2 shows an example of a conventional steel core aluminum stranded wire.
The steel core aluminum stranded wire 20 includes a steel core portion 3 in which six similar galvanized steel wires 1b are twisted on the outer periphery of a single galvanized steel wire 1a having a circular cross section, and an outer periphery of the steel core portion 3. Are formed by twisting 10 pieces of hard aluminum strands 15a having a circular cross section and 16 pieces of similar hard aluminum strands 15b around the outer periphery of the hard aluminum strand 15a ( Patent Document 1).

The hard aluminum strands 15a and 15b constituting the aluminum portion 7 are required to have the highest aluminum purity of 99.65% or more.
This purity is defined in JIS (Japanese Industrial Standards) H2110 “Electric Aluminum Ingot”, which is required by the standard of JIS C3108 “Electric Hard Aluminum Wire” as the conductor of the wire after drawing. This is to satisfy properties such as conductivity, tensile strength, and elongation.

  Such a steel core aluminum stranded wire 20 may be removed in order to repair or remove the power transmission line. However, since the steel core aluminum stranded wire 20 has been exposed to the natural world for many years, the surface of the aluminum has been oxidized, corroded or attached with dirt due to the influence of wind, rain, dust, air, etc. The characteristics of aluminum for electrical use cannot be satisfied, and until now it has not been realized difficult to reuse for electric wires even if it is removed.

  On the other hand, since aluminum distribution lines are covered with an insulation coating, the oxidation, corrosion, and contamination of aluminum wires are relatively less than those of bare power transmission lines, so that they can be recycled and have already been put into practical use.

However, even if aluminum distribution lines are recycled, if recycling is performed using only reused aluminum, the impurity concentration increases with each turn, and the electrical and mechanical characteristics defined in JIS C3108 decrease. To do. This is because during the aluminum recycling process, the zinc of the galvanized steel wire peels off and adheres to the aluminum stranded wire, or zinc plating adheres to the aluminum stranded wire due to long-term use and is mixed into the aluminum as an impurity. The main cause is. Therefore, the mixing ratio of recycled aluminum and new aluminum is specified so that the characteristics as electrical aluminum can be obtained, the mixing ratio of recycled products is 50% or less, and the component ratio of zinc is 0.01% or less. It has been operated (see Non-Patent Document 1).
JP 2000-90744 A Fujikura Technical Report “Development of Recycled Aluminum Distribution Lines” No. 83, October 1992

  When aluminum wires are collected from the steel core aluminum strands of the actually removed transmission lines, and dissolved and analyzed, the zinc content contained as impurities exceeds the target management level set for recycled products of distribution lines. Such aluminum wires may be reused for secondary processing products such as automobile parts that can be used even with low-purity aluminum, or in some cases treated as waste. It was.

Even if such low-purity aluminum is used, if it can be used as electrical aluminum, it can be recycled again as a conductor for electric wires. Compared to the enormous energy consumption of aluminum refining and casting using electricity, the material of aluminum wires can be obtained with much smaller energy, and it is expected to have a large economic effect from the viewpoint of energy saving and recycling. it can.

  Therefore, in view of the above-mentioned problems, the object of the present invention is to maintain the practically sufficient characteristics even when the zinc content exceeds the conventional target management level, and to be reused, and to use the aluminum Is to provide an electric wire.

Another object of the present invention is to provide a reusable method of reusing an aluminum wire that can be reused as a conductor for an electric wire while minimizing the deterioration of the characteristics of the electric aluminum ingot. There is to do.
Furthermore, the other object of this invention is to provide the reuse method of the aluminum wire which comprises the steel core aluminum twisted wire of the removed transmission line.

  As a result of repeated investigations and studies to achieve the above object, the present inventors have satisfied the required characteristics of JIS C3108 even in the following specific component ranges, and the aluminum wire used as the transmission line satisfies the conventional recycling. The present invention has been completed by finding that it can be reused even if it exceeds the range of Zn defined in aluminum.

  That is, the electrical aluminum of the present invention is composed of Si: 0.10% by mass or less, Fe: 0.25% by mass or less, Cu: 0.005% by mass or less, Mn: 0.005% by mass or less, and Ti and V. Total: 0.005% by mass or less, Zn: More than 0.01% by mass and 0.05% by mass or less, with the balance being composed of component ratios of aluminum and inevitable impurities.

  In addition, the aluminum wire recycling method of the present invention recovers an aluminum wire having a zinc component ratio of 0.01% by mass or less or an aluminum wire having a zinc component ratio of greater than 0.01% by mass. Alternatively, by melting and casting aluminum wires having different component ratios, the composition is Si: 0.10% by mass or less, Fe: 0.25% by mass or less, Cu: 0.005% by mass or less, Mn: 0.00%. 005% by mass or less, total of Ti and V: 0.005% by mass or less, Zn: an electrical component having a component ratio of more than 0.01% by mass and 0.05% by mass with the balance being aluminum and inevitable impurities It is made to recycle in aluminum.

  Furthermore, in the method for reusing an aluminum wire of the present invention, Si: 0.10 mass is obtained by collecting the aluminum wire constituting the steel core aluminum stranded wire of the removed transmission line, melting the aluminum wire, and casting it. % Or less, Fe: 0.25 mass% or less, Cu: 0.005 mass% or less, Mn: 0.005 mass% or less, total of Ti and V: 0.005 mass% or less, Zn: 0.05 mass% It is characterized in that the composition is controlled so as to be used for a power transmission line so as to contain the following components, with the balance being aluminum for electrical components having a component ratio consisting of aluminum and inevitable impurities.

  An electric wire made of electrical aluminum having the composition component ratio described above can be formed as a conductor by forming a single wire or twisting a plurality of wires.

  According to the electrical aluminum of the present invention, even if the Zn content is higher than that of the conventional product, the tensile strength, elongation and electrical conductivity equivalent to those of the conventional product are obtained, and the characteristics satisfying the standard value of JISC3108 can be obtained.

  For this reason, the electric wire using the electrical aluminum has practically sufficient characteristics even though the zinc content exceeds the conventional target management level, and can be suitably used for an overhead power transmission line. .

  In addition, according to the method of reusing aluminum wires of the present invention, after aluminum wires used as overhead power transmission lines and overhead distribution lines have fulfilled their mission for many years, they are recovered and melted again to retransmit power lines, etc. Since it can function as a conductor, it contributes to the effective use of resources and the minimization of energy loss, and can realize recycling. Furthermore, the cost of the aluminum wire can be reduced as compared with the case of casting a new aluminum ingot.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
In FIG. 1, the structure of the steel core aluminum twisted wire which concerns on this embodiment is shown.
This steel core aluminum stranded wire 10 includes a steel core portion 3 in which six similar galvanized steel wires 1b are twisted together on the outer periphery of one galvanized steel wire 1a having a circular cross section, and the outer periphery of the steel core portion 3. In addition, 10 hard aluminum strands 5a having a circular cross section are twisted together, and 16 similar hard aluminum strands 5b are twisted around the outer periphery of the hard aluminum strand 5a.

  Here, the hard aluminum wires 5a and 5b are composed of Si: 0.10% by mass or less, Fe: 0.25% by mass or less, Cu: 0.005% by mass or less, Mn: 0.005% by mass or less, Ti and V total: 0.005 mass% or less, Zn: more than 0.01 mass% and 0.05 mass% or less, with the balance being composed of aluminum and inevitable impurities.

In the hard aluminum strands 5a and 5b, the upper limit of Zn is set to 0.05% by mass in order to secure a conductivity of 61% or more as a conductor and to suppress a decrease in conductivity as much as possible. is there.
The degree of influence on the electrical conductivity due to the inclusion of Zn is 2.2 [% IACS (International Annealed Copper Standard) / Wt%]. That is, if zinc increases by 1%, the electrical conductivity deteriorates by 2.2%. Therefore, if Zn is 0.05 mass% or less, it is possible to reduce the electrical conductivity to about 0.1% or less.
Further, the reason why Zn is made larger than 0.01% by mass is to make it a conductor having the same conductivity as the above-described recycled aluminum for aluminum distribution lines having a conductivity of 61% or more.

  By using an aluminum material within the above composition range, as demonstrated in the examples described later, even if the Zn content is higher than that of the conventional product, it has the same tensile strength, elongation, and conductivity as the conventional product. Thus, characteristics satisfying the standard value of JIS C3108 can be obtained.

  Therefore, the steel core aluminum stranded wire 10 using the hard aluminum strands 5a and 5b made of this aluminum material has practically sufficient characteristics even though the zinc content exceeds the conventional target management level. It can be suitably used for an overhead power transmission line.

  Further, the steel core aluminum stranded wire 10 collects an aluminum wire having a zinc component ratio of 0.01% by mass or less or an aluminum wire having a component ratio of greater than 0.01% by mass, and the same component ratio and / or different. By melting and casting the aluminum wire of the component ratio, the composition is Si: 0.10 mass% or less, Fe: 0.25 mass% or less, Cu: 0.005 mass% or less, Mn: 0.005 mass %, Ti and V total: 0.005% by mass or less, Zn: Electrical aluminum containing a component ratio of more than 0.01% by mass and 0.05% by mass with the balance being aluminum and inevitable impurities It can be formed from a hard aluminum wire regenerated into

Furthermore, this steel core aluminum stranded wire 10 collects the aluminum wire which comprises the steel core aluminum stranded wire of the removed transmission line, melt | dissolves and casts this aluminum wire, Si: 0.10 mass% or less Fe: 0.25% by mass or less, Cu: 0.005% by mass or less, Mn: 0.005% by mass or less, total of Ti and V: 0.005% by mass or less, Zn: 0.05% by mass or less It can be used for a power transmission line by forming it with a hard aluminum element wire that has been composition-controlled and regenerated so that it contains electrical components with a component ratio of aluminum and inevitable impurities.
Here, Zn is 0.05% by mass or less, and 0.01% by mass or less is included. Insulating coated aluminum distribution lines have been put into practical use as recycled aluminum materials. Aluminum transmission lines removed after laying of steel core aluminum stranded wires have not been put into practical use yet. Therefore, this removed transmission line can be reused as a recycled aluminum material for an aluminum element wire satisfying the characteristics of JISC3108 and applied again to an overhead transmission line.

  Therefore, compared to the enormous energy consumption of aluminum refining and casting that newly takes alumina from bauxite and uses a large amount of electricity, hard aluminum strands can be obtained with much smaller energy, saving energy and recycling From this point of view, a great economic effect can be expected.

  In the present embodiment, the steel core aluminum stranded wire (ACSR) 10 has been described as an example. However, the hard aluminum strands 5a and 5b can be various alloys such as a heat-resistant aluminum wire. Moreover, in the steel core part 3, instead of the galvanized steel wires 1a and 1b, a galvanized invar wire, an aluminum-coated steel wire, an aluminum-coated invar wire, or the like may be used.

  Moreover, it can also be set as the electric wire which consists of a twisted wire only of aluminum, without providing the steel core part 3. FIG. Further, it may be used as an aluminum bus in a substation or the like.

  Continuous casting by the Properti method, which is a kind of continuous casting method using wheels and belts, using a conventional product having a composition ratio shown in Table 1 (the balance is aluminum) and the aluminum materials of Examples 1 and 2. Rolled to obtain a rough drawn wire having an outer diameter of 9.5 mm. Table 2 shows the characteristics of the rough drawn lines.

  Further, Table 3 shows the result of the characteristic test after drawing the rough line of the conventional product and Examples 1 and 2 to each size (4.5 mm, 3.8 mm, 3.2 mm, 2.6 mm).

  According to the results of Table 2 and Table 3, the aluminum materials of Examples 1 and 2 having a higher Zn component than the conventional products also have the same tensile strength, elongation and electrical conductivity as the conventional products. It was also confirmed that the characteristics satisfy the standard value of JIS C3108.

It is sectional drawing which shows the structure of the steel core aluminum strand wire (ACSR) of this embodiment. It is sectional drawing which shows the structure of the conventional steel core aluminum strand wire.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Zinc plating steel wire 1b Zinc plating steel wire 3 Steel core part 5a Hard aluminum strand 5b Hard aluminum strand 7 Aluminum part 10 Steel core aluminum strand 15a Hard aluminum strand 15b Hard aluminum strand 20 Steel core aluminum strand

Claims (5)

  Si: 0.10 mass% or less, Fe: 0.25 mass% or less, Cu: 0.005 mass% or less, Mn: 0.005 mass% or less, total of Ti and V: 0.005 mass% or less, Zn : Aluminum for electrical use, comprising a component greater than 0.01% by mass and less than or equal to 0.05% by mass, the balance being composed of a component ratio of aluminum and inevitable impurities.   An aluminum wire having a zinc component ratio of 0.01% by mass or less or an aluminum wire having a component ratio of greater than 0.01% by mass is recovered, and aluminum wires having the same component ratio and / or different component ratios are melted and cast. Therefore, the composition is Si: 0.10% by mass or less, Fe: 0.25% by mass or less, Cu: 0.005% by mass or less, Mn: 0.005% by mass or less, and the total of Ti and V: 0.0. 005% by mass or less, Zn: an aluminum wire comprising a component greater than 0.01% by mass and 0.05% by mass or less, with the balance being a component ratio of aluminum and unavoidable impurities. How to reuse.   By recovering the aluminum wire constituting the steel core aluminum stranded wire of the removed transmission line, melting and casting the aluminum wire, Si: 0.10% by mass or less, Fe: 0.25% by mass or less, Cu : 0.005% by mass or less, Mn: 0.005% by mass or less, Ti and V in total: 0.005% by mass or less, Zn: 0.05% by mass or less, the balance being aluminum and inevitable impurities A method for reusing an aluminum wire, wherein the composition is controlled so as to be electrical aluminum having a component ratio as described above and used for a power transmission line.   An electric wire, wherein the electric wire is a conductor formed by forming a single strand of aluminum for electrical use according to claim 1 or twisting a plurality of strands.   An electric wire characterized by being a conductor formed by forming a single aluminum wire or twisting a plurality of aluminum wires obtained by the aluminum wire recycling method according to claim 2 or 3.

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