JP2005174554A - Aluminum conductive wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an aluminum conductive wire used for an automobile and having excellent flexibility. <P>SOLUTION: This aluminum conductive wire uses, as an element wire, an aluminum fine wire comprising 0.15-0.40 mass% of Fe, 0.05-0.25 mass% of Cu and 0.05-0.20 mass% of Mg, and having the remnant comprising aluminum and inevitable impurities, and is characterized by intertwining the element wires. The aluminum conductive wire is characterized by that tensile strength of the wire formed by intertwining the element wires each having a diameter of 0.07-1.50 mm formed of the aluminum conductive wire, and subjected to coating has above 40N. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an aluminum conductive wire, and relates to an aluminum conductive wire that is lightweight, excellent in flexibility and flexibility, excellent in a moving part such as a driving portion, and can be used for a wire harness or a battery cable, particularly for automobiles.

  Conventionally, an annealed copper wire as stipulated in JIS C 3102 as a wiring wire for automobiles, or a wire subjected to tin plating or the like is twisted to form a stranded wire conductor, and this conductor is made of vinyl chloride, crosslinked polyethylene, etc. An electric wire coated with an insulating material has been used.

  In recent years, as the performance and functionality of automobiles has increased, the control circuits for various electronic devices have increased, increasing the number of wiring locations in the automobile and increasing the weight due to the wiring. It is becoming. In addition, the demand for reduction in wiring space and weight reduction can be met by making the wires thinner, and further, the environmental protection feeling has increased, and therefore automobile wires that are easy to recycle are required.

  In response to such demands, there is known an automotive conductor that improves the required electrical conductivity and solder adhesion, and has improved flexibility and tensile strength by using a steel wire coated with copper. (For example, Patent Document 1).

Japanese Patent Laid-Open No. 03-184210

  Moreover, without using a copper alloy wire, a hard copper wire and an annealed copper wire are twisted together to ensure mechanical strength by reducing the diameter, and at the same time, the conductor cross-sectional area is 0. A wire conductor for automobiles of 3 mm 2.0 mm or less is known (for example, Patent Document 2).

Japanese Patent Application Laid-Open No. 06-060739

  In addition, wiring conductors with zinc alloy coating on aluminum wires are used to solve electrical connection problems, and since copper is not used, there is no copper contamination when recycling automobiles, and recycled steel A wire conductor for wiring in which deterioration of the quality of the material is suppressed is known (for example, Patent Document 3).

Japanese Patent Laid-Open No. 06-203639

  In addition, conductors made of aluminum alloy are known mainly for overhead electric wires (for example, Patent Documents 4, 5, 6, and 7).

Japanese Patent Laid-Open No. 51-043307 JP-A-51-050212 Japanese Patent Laid-Open No. 51-058698 JP 52-045514 A

  The electric wire conductors for automobiles in Patent Documents 1 and 2 are conductors made of copper or copper alloy, and are heavy. In addition, solder is used for this conductor during connection, and during recycling, lead contained in the solder used during connection of the conductor is one of the environmental pollutants and has become a major problem. .

  Further, as disclosed in Patent Document 3, an aluminum wire coated with a zinc alloy as a wire harness conductor for an automobile is extremely effective as part of ease of recycling and weight reduction. However, the aluminum wires used for ordinary fine wires are mainly made of hard aluminum wires for electrical use (JIS C 3108), etc., and have a significantly lower flexibility than copper wires, etc., and around the door hinges of automobiles. In a place where the number of times of opening and closing is large, it breaks earlier compared to a copper wire, so that there is a problem that it cannot be used for a conventional structural part.

  In addition, Patent Documents 4, 5, 6, and 7 whose main purpose is for overhead wires are not particularly excellent in flexibility, and more generally, the wires themselves are thick and structurally different from those for automobiles. It was inappropriate.

  In the present invention, in order to reduce the weight as much as possible from the viewpoint of improving the performance of automobiles, various tests and researches have been conducted on the use of aluminum wires for automobile wire harnesses. Even if the electric wire for automobile wire harness is made lighter by using aluminum wire, it does not make sense if the electrical conductivity, bending resistance, etc. are reduced. Therefore, aluminum materials that balance these are used and are comparable to conventional copper wires. It is intended to provide aluminum wires for automobile wire harnesses.

  The invention according to claim 1 is composed of 0.15 to 0.40 mass% Fe, 0.05 to 0.25 mass% Cu, 0.05 to 0.20 mass% Mg, and the balance is composed of aluminum and inevitable impurities. An aluminum conductive wire comprising an aluminum fine wire as a strand and the strands twisted together.

  A second aspect of the present invention is the aluminum conductive wire according to the first aspect, wherein the tensile strength of an electric wire obtained by twisting strands having a diameter of 0.07 to 1.50 mm and further performing a coating process is 40 N or more. It is a featured aluminum conductive wire.

  According to the aluminum electric wire for an automobile wire harness of the present invention, weight reduction is achieved by making an aluminum wire, workability at the time of wire drawing, conductivity (%), twistability (whether or not stranded wire processing is possible), and bending resistance ( Door opening and closing, flexibility (when wiring harness is assembled), connectivity (dissimilar metal), excellent heat resistance, and recycling is much easier than copper wire wiring harness conductors. It has useful effects such as cleanness without occurrence.

  The present invention will be specifically described below. The reason for limiting the addition amount of Fe to 0.15 mass% or more and 0.40 mass% or less is that when the amount is less than 0.15 mass%, the strength decreases and the tensile strength required for a conductive wire for automobiles cannot be satisfied. On the other hand, if it exceeds 0.40 mass%, the electrical conductivity required for automobiles cannot be obtained. Therefore, the range of Fe is limited to 0.15 mass% or more and 0.40 mass% or less. Preferably they are 0.20 mass% or more and 0.30 mass% or less.

  The reason for limiting the addition amount of Cu to 0.05 mass% or more and 0.25 mass% or less is that the electrical conductivity required when it exceeds 0.25% is not satisfied, and conversely, when it is less than 0.05%, the flexibility is remarkably inferior. Because. Therefore, the range of Cu is limited to 0.05 mass% or more and 0.25 mass% or less. Preferably they are 0.10 mass% or more and 0.20 mass% or less.

  The reason for limiting the amount of Mg added to 0.05 mass% or more and 0.20 mass% or less is that when it exceeds 0.20 mass%, the electrical conductivity is not satisfied, and when it is less than 0.05 mass%, the flexibility is poor. Therefore, the range of Mg is limited to 0.05 mass% or more and 0.20 mass% or less. Preferably they are 0.10 mass% or more and 0.20 mass% or less.

  Inevitable impurities are preferable because they reduce the electrical conductivity. Preferably, Si is 0.10 mass% or less, Mn is 0.02 mass% or less, and the total amount of Ti and V is 0.025 mass% or less.

  Moreover, the strand strength of 0.07-1.50 mm is twisted and the tensile strength of the coated wire is 40N or more when the coated wire is assembled to an automobile, for example. In order not to break the connection portion with the electric wire or the terminal during the operation, it is necessary to have a certain tensile strength or more. Its tensile strength is 40N or more. The coating resin does not affect the tensile strength of the wire. In order to set the tensile strength to 40 N or more in the coated electric wire, it is necessary to set the tensile strength to 140 MPa or more in the aluminum strand having a diameter of 0.32 mm.

  With respect to conductivity, as the in-vehicle electronic equipment of automobiles becomes more sophisticated, it is required to have high conductivity. The conductivity is preferably 57% IACS or more.

In addition, when higher flexibility is required while maintaining the flexibility that can be practically used, it is possible to obtain these effects by further applying heat treatment after drawing or twisting.
Furthermore, by performing low-temperature annealing after wire drawing, it becomes possible to improve flexibility while maintaining tensile strength. Preferably, heat treatment is performed at 80 to 120 ° C. for 100 to 120 hours.

  The coating is required to have insulating properties and flame retardancy, and is preferably PVC and non-halogen. In particular, the thickness is not limited, but it is not preferable to be too thick from an industrial viewpoint. Although it depends on the thickness of the electric wire, a diameter of 0.10 mm to 1.70 mm is preferable.

  Examples of the present invention will be described. Table 1 shows the compositions of the inventive and comparative Al alloys. The Al alloys having the compositions shown in Table 1 were melted by a conventional method, and a rough drawing line of φ9.5 mm was obtained by a continuous casting and rolling method. The rough drawn wire thus obtained was drawn to a diameter of 2.6 mm and heat treated at 350 ° C. for 2 hours. At this time, the tensile strength after heat treatment was finished so as to be 150 MPa or less, and the wire was further drawn to obtain an aluminum strand having a diameter of 0.32 mm.

  The tensile strength was measured in accordance with JIS Z2241, and the average value was shown. The electrical conductivity was calculated by measuring the specific resistance by a four-terminal method in a constant temperature bath maintained at 20 ° C. (± 0.5 ° C.). In addition, the distance between terminals was 100 mm.

  In the bending test, as shown in FIG. 1, a test sample 1 having a diameter of 0.32 mm is sandwiched between mandrels 2, and a weight 3 having a weight of 50 g is hung on the lower end portion and a load is applied to suppress the deflection of the wire. The upper end is fixed by the connection tool 4. In this state, the sample was bent left and right by 30 degrees, and the number of bending until the sample was broken was measured for each sample. The number of round trips was counted as one round trip. The interval between the mandrels 2 was set to 1 mm so as not to compress the sample 1 during the test. The number of times of bending until it broke was assumed to be broken when the weight 3 suspended at the lower end of the sample 1 dropped. Sample 1 was repeatedly bent at a rate of 100 times / minute (rpm). The mandrel 2 is a mandrel having an arc portion corresponding to a circle having a radius of 90 mm. As a result, a bending stress corresponding to a radius of 90 mm can be applied.

  As is clear from Table 1, in Examples 1 to 16, it was possible to achieve both flexibility, tensile strength, and electrical conductivity, and since it was an aluminum electric wire, it was lightweight and excellent in recyclability.

  On the other hand, although the flexibility etc. were excellent in the prior art example 1, since it was Cu alloy, gravity was heavy and it was inferior to recyclability. In the conventional example 2, since it was a pure aluminum electric wire, it was inferior in the flexibility. Comparative Example 1 was inferior in flexibility due to a small amount of Fe, Cu, and Mg. Comparative Example 2 was inferior in flexibility and tensile strength due to a small amount of Fe. Comparative Example 3 was inferior in flexibility and conductivity because of a small amount of Fe. In Comparative Example 4, the conductivity was inferior because the Fe amount was small and the Cu and Mg amounts were large. Comparative Example 5 was inferior in flexibility and conductivity because of a small amount of Cu. Since Comparative Example 6 had a large amount of Mg, the flexibility and conductivity were inferior. Since Comparative Example 7 had a small amount of Mg, the flexibility and conductivity were inferior. Since Comparative Example 8 had a large amount of Cu, the flexibility and conductivity were inferior. Since Comparative Example 9 had a small amount of Cu, the flexibility and conductivity were inferior. Since Comparative Example 10 had a small amount of Mg, the flexibility was poor. Since Comparative Example 11 had a large amount of Mg, the conductivity was inferior. Since Comparative Example 12 had a large amount of Cu, the conductivity was inferior. Since Comparative Example 13 had a large amount of Fe and Mg and a small amount of Cu, the conductivity was inferior. Since Comparative Example 14 had a large amount of Fe, the flexibility and conductivity were inferior. Since Comparative Example 15 had a large amount of Fe, the conductivity was inferior. Since Comparative Example 16 had a large amount of Fe and Cu and a small amount of Mg, the conductivity was inferior.

It is explanatory drawing of the flexibility test of this invention.

Explanation of symbols

1 Wire 2 Mandrel 3 Weight 4 Connector

Claims (2)

0.15 to 0.40 mass% Fe, 0.05 to 0.25 mass% Cu, 0.05 to 0.20 mass% Mg, with the balance being aluminum fine wires composed of aluminum and inevitable impurities, An aluminum conductive wire comprising the strands twisted together.   2. The aluminum conductive wire according to claim 1, wherein the tensile strength of the wire obtained by twisting strands having a diameter of 0.07 to 1.50 mm and further having a coating process is 40 N or more.

Images