JP2017172062A - Braided wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a braided wire capable of obtaining both flexibility and flex resistance.SOLUTION: A braided wire 1 has multiple braided element wires 2. The braided wire 1 has a cylindrical shape. Multiple element wires 2 comprise multiple first Al alloy element wires and multiple second Al alloy element wires. The first Al alloy element wire extends more largely than the second Al alloy element wire. Tensile strength of the second Al alloy element wire is higher than that of the first Al alloy element wire. The first Al alloy element wire can be formed of 1000 series Al alloy. The second Al alloy element can be formed of one Al alloy selected from a group consisting of 3000 series Al alloy, 5000 series Al alloy, 6000 series Al alloy, and 7000 series Al alloy.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a braided wire.

  Conventionally, a braided wire formed by knitting a plurality of strands into a tubular shape is used in a wire harness used in a vehicle such as an automobile. As a strand constituting this type of braided wire, for example, as described in Patent Document 1, a copper strand mainly composed of copper such as a bare annealed copper wire, an oxygen-free annealed copper wire, and a tin-plated annealed copper wire is used. Has been.

  In recent years, in order to reduce the weight of wire harnesses and the like, it has been proposed to use aluminum strands mainly composed of aluminum instead of copper strands.

JP 2015-18756 A

  However, aluminum generally has a lower elongation than copper and is less flexible. For this reason, a braided wire made of an aluminum strand tends to deteriorate the assembly workability when assembling the wire harness.

  Aluminum is lower in strength than copper. For this reason, when a braided wire made of an aluminum strand is arranged in a high-vibration region that is subject to vibration, such as an engine or a door bent portion in an automobile or the like, there is a possibility that all the aluminum strand may be disconnected due to metal fatigue due to vibration. Therefore, it is difficult to arrange a braided wire made of an aluminum strand in a high vibration region.

  Furthermore, when it is going to improve the flexibility of a braided wire by improving the elongation of an aluminum strand, the intensity | strength of an aluminum strand will fall and the bending resistance of a braided wire will fall. On the contrary, when it is going to improve the bending resistance of a braided wire by improving the intensity | strength of an aluminum strand, the elongation of an aluminum strand will fall and the flexibility of a braided wire will fall.

  The present invention has been made in view of the above background, and intends to provide a braided wire capable of achieving both flexibility and bending resistance.

One aspect of the present invention is a tubular braided wire having a plurality of braided strands,
The plurality of strands are composed of a plurality of first Al alloy strands and a plurality of second Al alloy strands,
The elongation of the first Al alloy strand is larger than the elongation of the second Al alloy strand,
The tensile strength of the second Al alloy strand is a braided wire that is greater than the tensile strength of the first Al alloy strand.

  In the braided wire, a plurality of strands constituting the braided wire are composed of a plurality of first Al alloy strands and a plurality of second Al alloy strands. The elongation of the first Al alloy strand is larger than that of the second Al alloy strand, and the tensile strength of the second Al alloy strand is larger than the tensile strength of the first Al alloy strand. Therefore, in the braided wire, elongation is ensured by the plurality of first Al alloy strands, and strength is ensured by the plurality of second Al alloy strands. Therefore, the braided wire can achieve both flexibility and bending resistance compared to a braided wire made of a single Al alloy strand.

1 is an external view schematically showing a braided wire of Example 1. FIG. It is the figure which showed typically the II-II line cross section in FIG.

  The braided wire is composed of a plurality of first Al alloy strands and a plurality of second Al alloy strands.

  The elongation of the first Al alloy strand is larger than the elongation of the second Al alloy strand. The elongation of each strand is a value measured in accordance with JIS H4040 under conditions of an ambient temperature of 23 ° C. and a strain increase rate of 50% / min or less. Further, the tensile strength of the second Al alloy strand is larger than the tensile strength of the first Al alloy strand. The tensile strength of each strand is a value measured according to JIS H4040 under conditions of an ambient temperature of 23 ° C. and a strain increase rate of 50% / min or less.

  The first Al alloy strand and the second Al alloy strand can be composed of different Al alloys. In this case, the first Al alloy strand and the second Al alloy strand can easily satisfy the above-described relationship between elongation and tensile strength.

  Specifically, the first Al alloy strand can be composed of a 1000 series Al alloy. In this case, the second Al alloy strand can be composed of one Al alloy selected from the group consisting of a 3000 series Al alloy, a 5000 series Al alloy, a 6000 series Al alloy, and a 7000 series Al alloy. In this case, the first Al alloy strand and the second Al alloy strand more easily satisfy the above-described relationship between elongation and tensile strength.

  More specifically, when the first Al alloy wire is composed of a 1000 series Al alloy and the second Al alloy strand is composed of a 3000 series Al alloy, the second Al alloy strand is excellent in strength, which is advantageous for improving the strength. It is. When the first Al alloy wire is made of a 1000 series Al alloy and the second Al alloy strand is made of a 5000 series Al alloy, the second Al alloy strand is excellent in corrosion resistance, which is advantageous in improving corrosion resistance. When the first Al alloy strand is composed of a 1000-series Al alloy and the second Al alloy strand is composed of a 6000-series Al alloy, there is an advantage that the second Al alloy strand is easily tempered by heat treatment. When the first Al alloy strand is composed of a 1000-series Al alloy and the second Al alloy strand is composed of a 7000-series Al alloy, the second Al alloy strand is particularly excellent in strength.

  In the braided wire, the ratio of the number of the first Al alloy wires and the second Al alloy wires can be determined in consideration of the balance between flexibility and bending resistance. When importance is attached to the flexibility of the braided wire, the number ratio of the first Al alloy strands may be made larger than the number ratio of the second Al alloy strands within a range in which the bending resistance can be maintained. Further, when the bending resistance of the braided wire is regarded as important, the number ratio of the second Al alloy strands may be made larger than the number ratio of the first Al alloy strands within a range in which flexibility can be maintained.

  The ratio of the number of the first Al alloy strands and the second Al alloy strands can be, for example, in the range of 60:40 to 40:60, and preferably in the range of 55:45 to 45:55.

  In the braided wire, the strand diameter of the first Al alloy strand and the strand diameter of the second Al alloy strand can be the same diameter. In this case, the appearance is superior to the case where the strand diameter of the first Al alloy strand and the strand diameter of the second Al alloy strand are different from each other.

  In the braided wire, the knitting configuration of the first Al alloy strand and the second Al alloy strand is not particularly limited, but is preferably knitted in a regular knitting configuration. In this case, it is possible to obtain a braided wire that easily balances flexibility and bending resistance.

  For example, the first Al alloy strands and the second Al alloy strands may be alternately arranged one by one, or may be alternately arranged by a fixed number. In these cases, it is possible to obtain a braided wire that facilitates uniformizing flexibility and bending resistance in the cylinder circumferential direction.

  The braided wire can be suitably used in a vibration environment. In this case, the above-described operational effects can be sufficiently exhibited.

  The braided wire can be suitably used for vehicles. Specifically, for example, the braided wire can be applied to a vehicle wire harness. More specifically, the braided wire can be used so as to cover the outer periphery of the vehicle wire harness. Moreover, the said braided wire can be used so that the outer periphery of the 1 or 2 or more electric wire which comprises the wire harness for vehicles may be covered. Further, the braided wire can be used so as to be disposed between the conductor of the electric wire constituting the vehicle wire harness and the insulator so as to cover the conductor. Examples of the vehicle include an automobile, a train, a train, and a motorcycle.

  In addition, each structure mentioned above can be arbitrarily combined as needed, in order to acquire each effect etc. which were mentioned above.

  Hereinafter, the braided wire of an Example is demonstrated using drawing.

Example 1
The braided wire of Example 1 will be described with reference to FIGS. As shown in FIG. 1 and FIG. 2, the braided wire 1 of this example has a plurality of strands 2 knitted. The shape of the braided wire 1 is cylindrical. The plurality of strands 2 includes a plurality of first Al alloy strands and a plurality of second Al alloy strands. In addition, in FIG. 2, each strand 2 is abbreviate | omitted.

  Here, the elongation of the first Al alloy strand is larger than the elongation of the second Al alloy strand. Further, the tensile strength of the second Al alloy strand is larger than the tensile strength of the first Al alloy strand. In this example, the first Al alloy strand is made of a 1000 series Al alloy. The second Al alloy strand is composed of one Al alloy selected from the group consisting of a 3000 series Al alloy, a 5000 series Al alloy, a 6000 series Al alloy, and a 7000 series Al alloy.

Hereinafter, a braided wire sample was prepared and evaluated. An experimental example will be described.
(Experimental example)
(Preparation of braided wire)

  A first Al alloy strand made of a 1000 series Al alloy having a diameter of 0.26 mm and a second Al alloy strand made of a 6000 series alloy having the same diameter as the first Al alloy strand were prepared. The elongation of the first Al alloy strand was larger than that of the second Al alloy strand. Moreover, the tensile strength of the 2nd Al alloy strand was larger than the tensile strength of the 1st Al alloy strand.

  The braided wire of Sample 1 was obtained by weaving the first Al alloy strand and the second Al alloy strand into a cylindrical shape. Note that the braided configuration of the braided wire of the sample 1 has a total of 32 strikes and 7 possessions. However, the braided wire of Sample 1 is produced by alternately braiding the first Al alloy strand and the second Al alloy strand 16 times each.

  A braided wire of a reference sample was obtained by braiding a Cu strand having a diameter of 0.26 mm into a cylindrical shape. Moreover, the braided wire of Sample 1C was obtained by weaving the first Al alloy strand into a cylindrical shape. Moreover, the braided wire of Sample 2C was obtained by weaving the second Al alloy strand into a cylindrical shape.

  Note that the braided wires of the reference sample, the sample 1C, and the sample 2C produced above are each knitted with 32 strokes and a number of 7s. In this experimental example, the length of each braided wire in the longitudinal direction was 1 m.

  Based on a braided wire of a reference sample made of Cu wire that has been widely used in the past, the flexibility and bending resistance of the braided wires of Sample 1, Sample 1C, and Sample 2C were evaluated as follows.

(Flexibility evaluation)
Both ends of the braided wire were supported with a tension of 0.5 N so that the longitudinal direction was horizontal. Next, a load was applied to the central part of the braided wire, and the strength (N) when pushed downward by 3 cm was measured. The case where the obtained measured value was 5N or less was designated as “A +” because of excellent flexibility. The case where the measured value was more than 5N to 10N was regarded as “A” because the flexibility was good. The case where the measured value exceeded 10N was regarded as “C” because it was inferior in flexibility.

(Bend resistance evaluation)
The state of occurrence of wire breakage when each braided wire was bent 10 million times with a constant strain (0.004) was confirmed. The case where there was no disconnection in the element wire was designated as “A +” as having excellent bending resistance. Although disconnection was seen in a part of the strands constituting the braided wire, the conductivity of the braided wire as a whole can be ensured. A ”. The case where all the strands constituting the braided wire were disconnected was designated as “C” as being inferior in bending resistance.

  The evaluation results are summarized in Table 1.

  According to Table 1, the following can be understood. The braided wire of the sample 1C is made of a first alloy strand made of 1000 series Al alloy. The 1000 series Al alloy has good elongation among the Al alloys. For this reason, the braided wire of Sample 1C was able to ensure flexibility. However, 1000 series Al alloy has low strength among Al alloys. For this reason, the braided wire of Sample 1C could not ensure the bending resistance. That is, the braided wire of Sample 1C could not achieve both flexibility and bending resistance.

  The braided wire of the sample 2C is made of a second alloy wire composed of a 6000 series Al alloy. The 6000 series Al alloy has a relatively high strength among the Al alloys. Therefore, the braided wire of the sample 2C was able to ensure the bending resistance. However, the 6000 series Al alloy has a low elongation among the Al alloys. For this reason, the braided wire of the sample 2C cannot secure flexibility. That is, the braided wire of Sample 2C could not achieve both flexibility and bending resistance.

  On the other hand, the braided wire of the sample 1 is composed of a plurality of first Al alloy strands and a plurality of second Al alloy strands. In this example, as described above, the first Al alloy strand is made of a 1000 series Al alloy, and the second Al alloy strand is made of a 6000 series Al alloy. The elongation of the first Al alloy strand is larger than that of the second Al alloy strand, and the tensile strength of the second Al alloy strand is larger than the tensile strength of the first Al alloy strand. Therefore, the braided wire of Sample 1 can be stretched by a plurality of first Al alloy strands, and the strength can be secured by a plurality of second Al alloy strands, so that both flexibility and bending resistance can be achieved. did it. Therefore, it can be said that the braided wire of Sample 1 is useful as an alternative to the braided wire of the reference sample.

  As mentioned above, although the Example of this invention was described in detail, this invention is not limited to the said Example, A various change is possible within the range which does not impair the meaning of this invention.

1 Braided wire 2 Wire

Claims (6)

A tubular braided wire having a plurality of strands knitted,
The plurality of strands are composed of a plurality of first Al alloy strands and a plurality of second Al alloy strands,
The elongation of the first Al alloy strand is larger than the elongation of the second Al alloy strand,
The braided wire in which the tensile strength of the second Al alloy strand is greater than the tensile strength of the first Al alloy strand.   The braided wire according to claim 1, wherein the first Al alloy strand and the second Al alloy strand are made of different Al alloys. The first Al alloy strand is made of 1000 series Al alloy,
The second Al alloy strand is composed of one Al alloy selected from the group consisting of a 3000 series Al alloy, a 5000 series Al alloy, a 6000 series Al alloy, and a 7000 series Al alloy. The braided line described.   The braided wire according to any one of claims 1 to 3, wherein the first Al alloy strands and the second Al alloy strands are alternately arranged one by one or by a fixed number.   The braided wire according to any one of claims 1 to 4, which is used in a vibration environment.   The braided wire according to any one of claims 1 to 5, which is for a vehicle.

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