JP2005116274A - Extra fine copper alloy stranded conductor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ultrafine copper alloy stranded wire conductor which prevents a variation during terminal connection work and has high strength and high bending resistance.
SOLUTION: This ultrafine copper alloy stranded wire conductor has 7 to 19 copper alloy wires having a tensile strength of 900 MPa or more, an elongation of 1.0 to 3.0%, and an outer diameter of 0.03 to 0.2 mm. These strands 3 are twisted concentrically, and the outer diameter of the twisted wire 2 is reduced by subjecting the twisted wire 2 to circular compression. By subjecting the stranded wire 2 to a circular compression process, the gap portion is reduced, the outer diameter is reduced, the diameter of the stranded wire 2 can be reduced, and variations during terminal connection work can be prevented. . Further, the bending resistance is improved by reducing the diameter of the stranded wire 2. Further, by using a copper alloy wire having a tensile strength of 900 MPa or more and an elongation of 1.0 to 3.0% as the strand 3, a stranded wire conductor having high strength and high bending resistance can be obtained.
[Selection] Figure 2

Description

  The present invention relates to an ultrafine copper alloy stranded wire conductor used for wiring of an electronic device or the like, and more particularly, to an ultrafine copper alloy stranded wire conductor that prevents breakage during terminal connection work and has high strength and high bending resistance.

  Conventionally, twisted wires have been used for wire conductors for equipment in order to improve flexibility and bending resistance. In recent years, miniaturization and performance improvement of devices have progressed, and it has become necessary to perform more wiring in a small space. For this reason, the diameter of the electric wire for equipment is required to be reduced, and the conductor cross-sectional area is reduced (circular compression processing) and the insulator layer is thinned.

As a conventional stranded wire conductor obtained by subjecting a stranded wire to circular compression processing, for example, after applying circular compression processing to a stranded wire composed of a copper alloy wire containing Sn or Zn and Mg, a heat treatment is performed and a breaking load is applied. (Patent Document 1), the inner layer strand is softer than the outer layer strand and the cross-sectional area is subjected to circular compression to improve fatigue characteristics, resistance to cracking, and compression workability (Patent Document 2), a twisted wire made of Sn-containing copper alloy wire is subjected to a circular compression process, and then subjected to a heat treatment to improve the impact value while suppressing a decrease in tensile strength within a certain range (Patent Document 3), a high-strength wire that uses a high-strength strand at the center line of a twisted wire subjected to circular compression processing (Patent Document 4), and a twisted wire assembly of annealed copper wire from its outer diameter Is equivalent to the conventional one by applying circular compression through a die with a hole diameter of 5 to 20% smaller That to obtain a tensile strength of bell (Patent Document 5) are known.
Japanese Patent Laid-Open No. 6-187831 Japanese Patent Publication No. 7-50567 JP-A-5-266719 JP 2001-167644 A Japanese Utility Model Publication No. 8-1217

  However, conventional stranded wire conductors use soft materials such as annealed copper wires, or heat-treat copper alloy wires after stranded wires, and there is a problem that strength and bending resistance are too low in the region of ultra fine stranded wires. . In addition, when a high-strength strand is used as the strand that becomes the center of the stranded wire to increase the strength, there is a possibility that problems such as a decrease in conductivity and a mix-up of the strands during twisting may occur.

  Accordingly, an object of the present invention is to provide an ultra-fine copper alloy stranded wire conductor that prevents breakage during terminal connection work and has high strength and high bending resistance.

  In order to achieve the above object, the present invention performs a circular compression process on a stranded wire in which a plurality of copper alloy wires having a tensile strength of 900 MPa or more and an elongation of 1.0 to 3.0% are twisted concentrically. An ultrafine copper alloy stranded wire conductor is provided.

  According to this configuration, the outer diameter of the stranded wire conductor is reduced by subjecting the stranded wire obtained by twisting a plurality of copper alloy wires to circular compression. By using a copper alloy wire having a tensile strength of 900 MPa or more and an elongation of 1.0 to 3.0%, a stranded wire conductor having high strength and high bending resistance can be obtained.

According to the ultra-fine copper alloy stranded wire conductor of the present invention, by applying a circular compression process to a stranded wire obtained by twisting a plurality of copper alloy wires, the gap portion can be reduced and the outer diameter can be reduced. The diameter of the wire can be reduced. Furthermore, it is possible to prevent a variation during terminal connection work, and it is also possible to improve the fringe. Further, the bending resistance is improved by reducing the diameter of the stranded wire.
Further, by using a copper alloy wire having a tensile strength of 900 MPa or more and an elongation of 1.0 to 3.0%, a stranded wire conductor having high strength and high bending resistance can be obtained. Therefore, when the ultrafine copper alloy stranded wire conductor having the above characteristics is applied to a probe cable of a medical device, effects such as thinning and lightening of the probe cable can be obtained.

  Moreover, by limiting the outer diameter of the strand to 0.03 to 0.2 mm, it is possible to prevent breakage due to insufficient strength of the strand during light compression processing.

Further, the copper alloy wire has a range of 8 ≦ 2 · ln (A ₀ / A) ≦ 10 (where ln is a natural logarithm) when the wire diameter after the final heat treatment is A ₀ and the final wire diameter is A. High bending resistance can be obtained by wire drawing.

  An ultrafine copper alloy stranded wire conductor according to an embodiment of the present invention will be described. This ultrafine copper alloy stranded conductor has a tensile strength of 900 MPa or more, an elongation of 1.0-3.0%, and an outer diameter of 7-19 copper alloy strands concentrically. The outer diameter of the stranded wire is reduced by twisting and applying a process (circular compression process) in which the stranded wire is passed through a die and compressed into a circular cross section.

  As a material of the copper alloy wire having the above characteristics, Cu-0.3 mass% Sn, Cu-0.6 mass% Sn, Cu-0.2 mass% Sn-0.2 mass% In, Cu-2 mass% Ag, Cu -5 mass% Ag and the like.

  The reason why the outer diameter of the copper alloy wire is set to 0.03 to 0.2 mm is that if it is less than 0.03 mm, it tends to break due to insufficient strength of the wire during light compression processing, and exceeds 0.2 mm. This is because the effect of applying the present invention is reduced because sufficient strength can be secured even with an annealed copper wire.

FIG. 1 shows the relationship between workability, flex life, and tensile strength. The case where Cu-0.2mass% Sn-0.2mass% In is used as a copper alloy strand is shown. Here, the “working degree” is 8 ≦ 2 · ln (A ₀ / A) ≦ 10, where A _{0 is} the wire diameter after the final heat treatment of the copper alloy wire and A is the final wire diameter after wire drawing. (Where ln is a natural logarithm). As can be seen from this graph, the tensile strength tends to increase slightly as the degree of work increases, but a high value (390 to 420 MPa) is obtained in the entire range of the measured degree of work 6 to 1.2. In addition, when the degree of work exceeds 10 for the bending life, that is, the work hardening characteristic, the bending resistance is lowered even if the tensile strength is the same. Therefore, it is preferable that the degree of processing is drawn in a range of 8 ≦ 2 · ln (A ₀ / A) ≦ 10.

  FIG. 2 shows an electric wire for equipment using an ultrafine copper alloy stranded wire conductor according to an embodiment of the present invention. The device electric wire 1 of this example is made of Cu-0.3 mass% Sn, has a tensile strength of 900 MPa or more, an elongation of 1.0 to 3.0%, and a wire diameter of 0.03 to 0.2 mm. The strand 3 is concentrically twisted and subjected to a circular compression process to form an insulating coating 4 on the outer periphery thereof.

  FIG. 3 shows an electric wire for equipment using a twisted wire not subjected to circular compression as a conventional example. The electric wire 10 for apparatus of this prior art example consists of Cu-0.2mass% Sn-0.2mass% In, and twisted seven strands 13 with a wire diameter of 0.03-0.2mm concentrically. An insulation coating 14 is formed on the outside of the stranded wire 12.

  As can be seen by comparing FIG. 2 and FIG. 3, by performing circular compression processing, the surrounding strand 3 is deformed, the cross-sectional area of the stranded wire 2 is reduced, and insulation that enters between the strands 3 is also achieved. The amount of body can be reduced and the amount of insulator used can be reduced, and further, the effect of preventing variation can be obtained.

  Table 1 shows the results of a bending life test performed on the stranded wire of the example shown in FIG. 1 and the conventional example shown in FIG. 2 at a bending radius of 2 mm.

この表１から明らかなように、円形圧縮加工を施すことにより従来例と比較して２倍以上耐屈曲性が向上している。

As is apparent from Table 1, the bending resistance is improved twice or more as compared with the conventional example by applying the circular compression process.

  In addition, after performing a circular compression process to a twisted wire, you may perform processes, such as heat processing and correction, according to the characteristic requested | required.

It is the graph which showed the relationship between the workability of the strand used for the ultrafine copper alloy twisted wire conductor which concerns on embodiment of this invention, bending life, and tensile strength. It is sectional drawing which shows the electric wire for apparatuses using the ultra-fine copper alloy twisted wire conductor which concerns on the Example of this invention. It is sectional drawing which shows the electric wire for apparatuses which has not performed the circular compression process as a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Device wire 2 Stranded wire 3 Wire 4 Insulation coating 10 Device wire 12 Stranded wire 13 Wire 14 Insulation coating

Claims (5)

  Extra-fine copper alloy stranded wire, characterized in that a circular compression process is performed on a stranded wire obtained by concentrically twisting a plurality of copper alloy wires having a tensile strength of 900 MPa or more and an elongation of 1.0 to 3.0%. conductor.   2. The ultrafine copper alloy stranded wire conductor according to claim 1, wherein an outer diameter of the copper alloy wire is 0.03 to 0.2 mm. The copper alloy wire is 8 ≦ 2 · ln (A ₀ / A) ≦ 10 (where ln is a natural logarithm) where A _{0 is} the wire diameter after the final heat treatment and A is the final wire diameter. The ultrafine copper alloy stranded wire conductor according to claim 1, wherein the wire is drawn into a thin wire.   The ultra-fine copper alloy stranded wire conductor according to claim 1, wherein the plurality of copper alloy wires are 7 to 19 copper alloy wires. The plurality of copper alloy wires are Cu-0.3 mass% Sn, Cu-0.6 mass% Sn, Cu-0.2 mass% Sn-0.2 mass% In, Cu-2 mass% Ag, or Cu-5 mass% Ag. The ultrafine copper alloy stranded wire conductor according to claim 1, wherein

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