JP2010205549A - Method of manufacturing wire conductor, and wire conductor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wire conductor which can be made thin in diameter and light in weight, and does not have loosening in the element wires and is superior in flexibility. <P>SOLUTION: After stranding a plurality of peripheral copper alloy fine wires 12 with a diameter 0.01 mm or more and 0.6 mm or less around a center copper alloy fine wire 11 with the diameter 0.01 mm or more and 0.6 mm or less, a circular compression processing is applied on the stranded wire so that only the peripheral copper alloy fine wires 12 may be compressed in substance. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for producing a wire conductor used for an automobile wire and the like, and a wire conductor.

  In recent years, there is an increasing demand for reducing the diameter and weight of automobile wires.

  Conventionally, as a conductor of an automobile electric wire, an annealed copper wire or a wire obtained by twisting an annealed copper wire with tin plating or the like has been used. However, although these annealed copper wires and tin-plated annealed copper wires are excellent in workability, there is a problem that the outer diameter is increased due to poor mechanical strength, and as a result, the weight is also increased.

  In this regard, for example, in Patent Document 1, a stainless steel having a specific gravity smaller than that of copper is used as a center wire, and a peripheral wire made of copper or a copper alloy is twisted around the wire. It is described that it is used as a conductor. Patent Document 2 uses a wire whose mechanical properties such as tensile strength are improved by performing specific wire drawing on a copper alloy containing less than 1.0 mass% of a metal element such as Mg. An automotive wire conductor is described. By using a strand having a small specific gravity or a high tensile strength, it is intended to reduce the thickness and weight.

  By the way, the above-mentioned patent document describes that a circular compression process is performed on the twisted strands in order to prevent the strands from being separated and to stabilize the twisted strand shape. However, in the case of a wire conductor that is simply subjected to circular compression as in the above-mentioned patent document, the stranding of the strands is surely prevented and the stranded wire shape is stabilized, but the flexibility may be impaired. was there. When the flexibility is lowered, the workability of the wiring is lowered, and there is a problem that the degree of freedom in the wiring design is reduced due to restrictions on the wiring place and the like.

  Thus, as a result of studying the cause by earnest research, the present inventors have found that “the degree of restraint by the peripheral copper alloy fine wire relative to the central copper alloy fine wire” greatly affects the flexibility.

  For example, as can be seen from the description of the above-mentioned patent documents (refer to the selection diagrams for both Patent Documents 1 and 2), if the circular compression is simply applied, the center fine material is also deformed, and the restraint between the central copper alloy fine material and the peripheral copper alloy fine material The degree will be very high. In such a case, there has been a problem that the flexibility is remarkably lowered and the degree of freedom in wiring design is greatly reduced.

JP 2004-288625 A JP 2008-16284 A

  An object of the present invention is to provide a method of manufacturing a wire conductor that can be reduced in diameter and weight, and that does not cause strand breakage and is excellent in flexibility, and by such a method. The object is to provide a manufactured wire conductor.

  In order to achieve the above object, the invention described in claim 1 is characterized in that a peripheral copper alloy fine wire having a diameter of 0.01 mm to 0.6 mm is disposed around a central copper alloy fine wire having a diameter of 0.01 mm to 0.6 mm. After twisting a plurality of wires, a circular compression process is performed on the stranded wire so that only the peripheral copper alloy fine wire is substantially compressed.

  Invention of Claim 2 is the manufacturing method of the electric wire conductor of Claim 1, Comprising: With respect to the said stranded wire, in the cross section of the said electric wire conductor, the said center copper alloy fine wire and the said surrounding copper alloy fine wire of the circumference | surroundings The circular compression process is performed such that the contact length is ¼ or less of the peripheral length of the central copper alloy fine wire.

  The invention described in claim 3 is characterized in that, in the method of manufacturing an electric wire conductor according to claim 1 or 2, the circular compression processing rate of the circular compression processing is 85% or more and 99% or less. .

  According to a fourth aspect of the present invention, in the method for manufacturing an electric wire conductor according to any one of the first to third aspects, the circular compression process includes a plurality of compression processes. .

The invention described in claim 5 is the method of manufacturing a wire conductor according to any one of claims 1 to 4, wherein the wire conductor has a cross-sectional area of 0.1 mm ² or less. It is.

  The invention described in claim 6 is the method of manufacturing an electric wire conductor according to claim 5, wherein the electric wire conductor has a tensile breaking load of 100 N or more.

  The invention described in claim 7 is the method of manufacturing a wire conductor according to any one of claims 1 to 6, wherein the wire conductor is a wire conductor for an automobile.

  Invention of Claim 8 is a manufacturing method of the electric wire conductor of any one of Claims 1 thru | or 7, The said copper alloy contains 1 mass% or more and less than 24 mass% Ag. It is what.

  According to the ninth aspect of the present invention, a plurality of peripheral copper alloy thin wires having a diameter of 0.01 mm to 0.6 mm are twisted around a central copper alloy thin wire having a diameter of 0.01 mm to 0.6 mm, and circular compression is performed. A wire conductor formed by processing, wherein the central copper alloy fine wire has a substantially retained cross-sectional shape before compression.

  According to a tenth aspect of the present invention, in the electric wire conductor according to the ninth aspect, a contact length between the central copper alloy fine wire and the surrounding copper alloy fine wire around the electric wire conductor in the cross section of the electric wire conductor is the central copper alloy fine wire. It is characterized in that it is ¼ or less of the perimeter of.

  According to the present invention, it is possible to obtain an electric wire conductor that can be reduced in diameter and weight, and that does not cause strand breakage and is excellent in flexibility.

It is sectional drawing which shows an example of the electric wire for motor vehicles using the electric wire conductor of one Embodiment of this invention. It is sectional drawing which shows the electric wire conductor before the compression process of one Embodiment of this invention.

  Embodiments of the present invention will be described below. Although the description will be made based on the drawings, the drawings are provided for illustration only, and the present invention is not limited to the drawings.

FIG. 1 is a cross-sectional view showing an automobile electric wire using an electric wire conductor according to an embodiment of the present invention.
As shown in FIG. 1, this automobile electric wire is composed of a wire conductor 1 and an insulating coating 2 provided on the outer periphery thereof.

  The electric wire conductor 1 has a structure in which a plurality of, for example, six peripheral copper alloy fine wires 12 are twisted around a central copper alloy fine wire 11 and subjected to compression processing so that the cross section becomes a substantially circular shape. The circular compression process is performed such that only the peripheral copper alloy fine wire 12 is substantially compressed without compressing the central copper alloy fine wire 11. That is, the central copper alloy fine wire 11 holds the cross-sectional shape (circular shape) before compression processing, and only the peripheral copper alloy fine wire 12 positioned outside the central copper alloy fine wire 12 has such a shape that the entire cross-sectional shape becomes a circular shape. It is compressed. FIG. 2 shows the electric wire conductor 1 before compression processing.

  In addition, it is preferable that the contact length of the center copper alloy fine wire 11 and the surrounding copper alloy fine wire 12 around the wire conductor 1 is ¼ or less of the circumference of the central copper alloy fine wire in the cross section of the wire conductor 1. More preferably, it is 1/5 or less. When the contact length between the central copper alloy fine wire 11 and the peripheral copper alloy fine wire 12 is larger than 1/4 of the peripheral length of the central copper alloy fine wire, the degree of restraint by the peripheral copper alloy fine wire 12 on the central copper alloy fine wire 11 increases. The flexibility of the wire conductor 1 is reduced.

  The copper alloy fine wires used for the central copper alloy fine wire 11 and the peripheral copper alloy fine wire 12 are formed of an alloy containing at least one metal element such as Mg, Ag, Sn, Zn, and the like, the balance being Cu and inevitable impurities. The diameter is 0.01 mm or more and 0.6 mm or less, preferably 0.03 mm or more and 0.3 mm or less. If the diameter of the copper alloy fine wire is less than the above range, the tensile breaking load is reduced. If the copper alloy fine wire exceeds the above range, the electric wire cannot be reduced in diameter.

  In addition, the copper alloy fine wire has a longitudinal elastic modulus of preferably 110 GPa or more, and more preferably 120 GPa or more. When the longitudinal elastic modulus is smaller than the above, it is difficult to perform a circular compression process that satisfies the above-described conditions. In addition, all the longitudinal elastic modulus of a copper alloy fine wire can be measured with a general purpose tensile testing machine.

  As a material for the copper alloy fine wire, an alloy containing 1% by mass to less than 24% by mass of Ag and the balance of Cu and inevitable impurities being obtained is particularly preferable because of high strength and excellent workability. The content of Ag is more preferably 3% by mass or more and less than 14% by mass. The central copper alloy fine wire 11 and the peripheral copper alloy fine wire 12 may be made of the same kind of copper alloy fine wire, or may be made of different types of copper alloy fine wires. However, the diameter is substantially the same.

  For the purpose of the present invention, it is preferable to use the copper alloy fine wire produced by the following method.

  Casting of an alloy containing Ag in the above-mentioned range, that is, preferably in the range of 1 to 24% by mass, more preferably in the range of 3 to 14% by mass, with the balance being substantially Cu and inevitable impurities. The rod is subjected to cold working for diameter reduction, and one or more heat treatments are performed during the cold working. After the final heat treatment, cold working is performed to the final wire diameter with a reduction in area of 99% or more. The heat treatment is preferably performed at a temperature of 400 to 600 ° C. for 1 to 100 hours.

  Alternatively, an alloy containing Ag in the above range, that is, preferably in the range of 1 to 24% by mass, preferably in the range of 3 to 14% by mass, with the balance being substantially made of Cu and inevitable impurities. Precipitation heat treatment is performed on the casting rod, intermediate cold working is performed, recovery heat treatment for annealing / recovery is performed, and cold working is further performed to a final wire diameter with a reduction in area of 99% or more. The precipitation heat treatment is preferably performed at a temperature of 400 to 600 ° C. for 1 to 100 hours, and the recovery heat treatment is preferably performed at a temperature of 200 to 450 ° C. for 5 to 100 hours.

The area reduction rate is defined by the following formula.
Area reduction ratio R (%) = [(S ₀ −S) / S ₀ ] × 100
(S ₀ : cross-sectional area before processing, S: cross-sectional area after processing)

  The copper alloy fine wire thus manufactured has high strength and high electrical conductivity.

  As described above, the wire conductor 1 is subjected to circular compression processing. The circular compression process is preferably performed by repeating the compression a plurality of times. Thereby, the process crack of the copper alloy fine wire at the time of circular compression processing can be suppressed thru | or prevented.

Further, the circular compression processing rate (the total processing rate when compression is repeated a plurality of times) is preferably in the range of 85% to 99%. If the circular compression processing rate is less than 85%, it becomes difficult to perform the circular compression processing that satisfies the above-described conditions, and the flexibility of the wire conductor 1 is reduced. On the other hand, when the circular compression processing rate exceeds 99%, the strands of the strands are likely to occur. The circular compression ratio is more preferably in the range of 90% to 98%. Here, the circular compression rate (%) is expressed by the following equation when the outer diameter of the twisted wire before processing is L1, and the outer diameter of the twisted wire after processing (that is, the outer diameter of the wire conductor 1) is L2. Desired.
Circular compression rate (%) = (L2 / L1) × 100

In addition, the cross-sectional area of the wire conductor 1 is particularly effective when the cross-sectional area is 0.1 mm ² or less. When the cross-sectional area of the wire conductor 1 exceeds 0.1 mm ^2, diameter of the wire, it can not be achieved sufficiently lightweight.

  Furthermore, the electric wire conductor 1 preferably has a tensile breaking load of 100 N or more. The tensile breaking load of the electric wire conductor 1 can be measured with a general-purpose tensile testing machine.

  The insulating coating 2 is formed of vinyl chloride resin, polyolefin, cross-linked polyolefin or the like. Polyolefins include low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), very low density polyethylene (VLDPE), linear low density polyethylene (LLDPE), polypropylene, polyisobutylene, ethylene and acetic acid. Vinyl copolymer (EVA), ethylene / ethyl acrylate copolymer (EEA), ethylene / methyl acrylate copolymer (EMA), ethylene / propylene copolymer, ethylene / propylene / diene terpolymer, And ethylene / butene copolymer. Additives such as antioxidants may be added to the insulating material forming the insulating coating 2. In the present invention, since the wire conductor 1 is subjected to a circular compression process, the thickness of the insulating coating 2 can be reduced as compared with a case where the circular compression process is not performed.

  In the electric wire for automobiles configured as described above, a copper alloy fine wire having a diameter of 0.01 mm or more and 0.6 mm or less is used as a twisted strand of the electric wire conductor 1, so that even a small diameter is a high machine. Strength and conductivity. Therefore, it is possible to reduce the diameter and weight of the electric wire. In addition, since the central copper alloy fine wire 11 is not compressed, and the circular compression process is performed so that only the peripheral copper alloy fine wire 12 is substantially compressed, the occurrence of strand breakage at the end is suppressed. Moreover, the fall of the flexibility accompanying the conventional circular compression process is also suppressed. Furthermore, by suppressing the decrease in flexibility, the workability of the wiring is improved, and restrictions on the wiring place and the like are eliminated, so that the degree of freedom in wiring design increases.

  As mentioned above, although the example which applied the electric wire conductor of the present invention to the conductor of the electric wire for cars was explained, the present invention is not limited to such an example, and can be widely applied to various electric wires and cables. The wire / cable can be reduced in diameter and weight, and the wire / cable can be prevented from being broken and excellent in flexibility.

  Next, the present invention will be described in more detail with reference to examples.

[Manufacture of copper alloy fine wires]
(Production Example 1)
A Cu-Sn alloy consisting of 0.6% by mass of Sn and the balance of Cu is continuously cast by a horizontal continuous casting machine having a graphite mold having a water-cooling jacket on the outer periphery to produce an 8 mmφ casting rod. Cold wire processing was performed to obtain a thin wire (1) having a wire diameter of 0.02 mm.

(Production Example 2)
A Cu-Mg alloy composed of 0.6% by mass of Mg and the balance of Cu is continuously cast by a horizontal continuous casting machine having a graphite mold having a water-cooling jacket on the outer periphery to produce an 8 mmφ casting rod. Cold wire processing was performed to obtain a thin wire (2) having a wire diameter of 0.02 mm.

(Production Example 3)
A Cu-Zn alloy consisting of 0.9% by mass of Zn and the balance of Cu is continuously cast by a horizontal continuous casting machine having a graphite mold having a water-cooling jacket on the outer periphery to produce an 8 mmφ casting rod. Cold wire processing was performed to obtain a thin wire (3) having a wire diameter of 0.02 mm.

(Production Example 4)
A Cu-Ag alloy composed of 1% by mass of Ag and the balance of Cu is continuously cast by a horizontal continuous casting machine having a graphite mold having a water-cooling jacket on the outer periphery to produce an 8 mmφ casting rod. And a thin wire (4) having a wire diameter of 0.02 mm was obtained.

(Production Example 5)
A Cu-Ag alloy consisting of 10% by mass of Ag and the balance of Cu is continuously cast by a horizontal continuous casting machine having a graphite mold having a water-cooling jacket on the outer periphery to produce a casting rod of 8 mmφ, and cold working is performed. And a thin wire (5) having a wire diameter of 0.02 mm was obtained.

(Production Example 6)
A Cu-Ag alloy consisting of 10% by mass of Ag and the balance of Cu is continuously cast by a horizontal continuous casting machine having a graphite mold having a water-cooling jacket on the outer periphery to produce an 8 mmφ casting rod. Processed to 5 mmφ (area reduction 61%), then heat treated at 450 ° C. for 10 hours, then cold worked to 2 mmφ (area reduction 84%), then 370 for 15 hours heat treatment To obtain a fine wire (6) having a wire diameter of 0.05 mm (area reduction rate: 99.93%), electrical conductivity (IACS) of 65%, and tensile strength of 1420 MPa.

(Production Example 7)
A Cu-Ag alloy consisting of 10% by mass of Ag and the balance of Cu is continuously cast by a horizontal continuous casting machine having a graphite mold having a water-cooling jacket on the outer periphery to produce an 8 mmφ casting rod. After processing to 5 mmφ (area reduction rate 61%), followed by heat treatment at 450 ° C. for 10 hours, cold processing is performed to obtain a wire diameter of 0.05 mm (area reduction rate 99.0%). A thin wire (7) having a rate (IACS) of 63% and a tensile strength of 1530 MPa was obtained.

[Manufacture of wire conductors]
Example 1
Seven fine wires (1) were twisted around one of them, and then the twisted wire was passed through a hole in a die to perform a circular compression process to obtain an electric wire conductor. The circular compression process was performed such that the stranded wire was passed through two dies having different hole diameters so that the circular compression ratio was 95% in total.

Examples 2-7
A wire conductor was obtained in the same manner as in Example 1 except that the thin wires (2) to (7) were used instead of the thin wire (1).

Examples 8-11, Reference Example 1
The circular compression rate is 80% (Reference Example 1), 85% (Example 8), 90% (Example 9), 98% (Example 10), or 99% (Example 11) in total. An electric wire conductor was obtained in the same manner as in Example 4 except that.

Reference Example 2, Comparative Example 1
A wire conductor was obtained in the same manner as in Example 4 except that the number of times of circular compression was set to 1 (Reference Example 2) or no circular compression was performed (Comparative Example 1).

  The wire conductors obtained in Examples 1 to 11, Reference Examples 1 and 2, and Comparative Example 1 were evaluated for thin wire breakage and flexibility by the methods described below. These results are obtained by comparing the diameter and cross-sectional area of the wire conductor, the cross-sectional shape of the central copper alloy fine wire, the contact length (l) of the central copper alloy fine wire and the peripheral copper alloy fine wire in the cross section with respect to the peripheral length (L) of the central copper alloy fine wire. It shows in Table 1 with a ratio (l / L). The cross-sectional shape of the central copper alloy fine wire and the ratio (l / L) of the contact length (l) of the central copper alloy fine wire and the peripheral copper alloy fine wire in the cross-section to the peripheral length (L) of the central copper alloy fine wire are as follows. Asked.

[Bare of strands]
The electric wire conductor was cut, and the presence or absence of a thin wire breakage at the cut end was confirmed visually.
[Flexibility]
One end of the wire conductor was fixed via a tension meter, and the tension was measured when the wire conductor was wound around a mandrel having a radius of 0.5 mm within a range of a central angle of 90 degrees. And the case where the tension | tensile_strength was equal or less compared with the tension | tensile_strength similarly measured about the electric wire conductor before giving circular compression processing was made into (circle), and the case where it was large was set as x.

  In addition, this invention is not limited to the said Example, All modifications and changes are possible unless it deviates from the category of this invention.

  DESCRIPTION OF SYMBOLS 1 ... Electric wire conductor, 2 ... Insulation coating, 11 ... Center copper alloy fine wire, 12 ... Peripheral copper alloy fine wire.

Claims (10)

  A plurality of peripheral copper alloy fine wires having a diameter of 0.01 mm to 0.6 mm are twisted around a central copper alloy fine wire having a diameter of 0.01 mm to 0.6 mm, and then the peripheral copper alloy is applied to the twisted wire. A method for producing an electric wire conductor, wherein a circular compression process is performed so that only a thin wire is substantially compressed.   With respect to the stranded wire, the contact length of the central copper alloy fine wire and the peripheral copper alloy fine wire around it in the cross section of the electric wire conductor is ¼ or less of the peripheral length of the central copper alloy fine wire, The method of manufacturing a wire conductor according to claim 1, wherein the circular compression process is performed.   The method for manufacturing an electric wire conductor according to claim 1 or 2, wherein a circular compression processing rate of the circular compression processing is 85% or more and 99% or less.   The method of manufacturing a wire conductor according to claim 1, wherein the circular compression process includes a plurality of compression processes. The wire conductor, the manufacturing method according to claim 1 or wire conductor according to any one of the 4 and having a sectional area of 0.1 mm ² or less.   6. The method of manufacturing an electric wire conductor according to claim 5, wherein the electric wire conductor has a tensile breaking load of 100 N or more.   The method of manufacturing an electric wire conductor according to claim 1, wherein the electric wire conductor is an automobile electric wire conductor.   The said copper alloy contains 1 mass% or more and less than 24 mass% Ag, The manufacturing method of the electric wire conductor of any one of the Claims 1 thru | or 7 characterized by the above-mentioned. A wire conductor in which a plurality of peripheral copper alloy fine wires having a diameter of 0.01 mm to 0.6 mm are twisted around a central copper alloy fine wire having a diameter of 0.01 mm to 0.6 mm and circular compression processing is performed. ,
The center copper alloy fine wire has a substantially unchanged cross-sectional shape before being compressed.   The contact length between the central copper alloy fine wire and the peripheral copper alloy fine wire around the central copper alloy fine wire in a cross section of the wire conductor is ¼ or less of the peripheral length of the central copper alloy fine wire. Wire conductors.

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