JPH081217U - Electric wire for device wiring - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide an electric wire for device wiring, which has a small tensile strength, a high tensile strength, and a high conductivity. SOLUTION: 7 to 19 tin-plated annealed copper wires or a twisted wire aggregate of annealed copper wires are twisted together to form an annealed copper stranded wire conductor, which is subjected to a die drawing process so that a compression outer diameter ratio becomes 80 to 95%. . An insulating coating layer is provided on the outside of the thus-formed semi-hardened copper-made compressed stranded wire conductor to manufacture an electric wire for device wiring.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an insulated wire used for internal wiring of devices such as VTRs, VTR cameras and audio equipments.

[0002]

[Prior art]

 With regard to internal wiring for electrical equipment in recent years, the number of circuits used has increased along with the improvement in the performance of the equipment. In addition, the number of insulated wires used and the number of connector poles are increasing, and the equipment itself is becoming smaller. As a result, the wiring space inside the equipment has been reduced, and the distance between the connector poles has been narrowed from 2.0 mm to 2.5 m in the past to 1.5 mm or even 1.0 mm.

For these reasons, there is a strong demand for the wire to have a smaller diameter, and for this reason, the conductor cross-section area is reduced and the insulating layer is generally made thinner.

However, such a reduction in diameter causes many problems such as a decrease in tensile strength, a decrease in strength of a connecting portion with an electric connector (referred to as terminal fixing force), and an increase in conductor resistance. As a result, the wires may be broken, the electrical connectors may come off, impedance mismatching, etc. may occur, resulting in a significant decrease in the reliability of the equipment. In order to solve these problems, there is a method of using a copper alloy wire or a stainless-copper composite wire as a conductor, but all of them have a problem of increasing the conductor resistance.

[0005]

[Problems to be solved by the device]

 The present invention has been made to solve the above-mentioned problems, and uses a soft copper stranded wire or a copper-plated soft copper stranded wire having a tensile strength similar to the conventional one to reduce the diameter by reducing the cross-sectional area of the conductor. In this case, the tensile strength is improved by 20 to 40% and the conductor resistance value is reduced by 12 to 32% as compared with the one performed by the conventional method, and it is possible to provide an electric wire for equipment wiring in which the reduction in reliability due to the diameter reduction is improved. To aim.

[0006]

[Means for Solving the Problems]

 The electric wire for device wiring of the present invention comprises a stranded wire conductor formed by twisting 7 to 19 pieces of annealed copper wire or tin-plated annealed copper wire, and an electric insulating coating layer covering the outer periphery of the stranded wire conductor. The stranded conductor is circularly compressed by passing a stranded wire assembly having an outer diameter in the range of 0.22 mm to 1.9 mm through a die having a hole diameter 5-20% smaller than the outer diameter at room temperature. It has a feature in using what is made.

[0007]

[Action]

 Conventionally, the conductor used for this kind of equipment wiring wire is a stranded conductor formed by twisting strands of annealed copper wire or tin-plated annealed copper wire, which generally has a tensile strength of 25 to 28 kgf / mm2. Have. However, if the conductor cross-sectional area is reduced to reduce the diameter of the wire, the tensile strength will decrease and the conductor resistance will increase accordingly.

In this respect, as in the above means, a twisted wire assembly having an outer diameter in the range of 0.22 mm to 1.9 mm is used as a twisted wire conductor in a die having a hole diameter 5-20% smaller than the outer diameter. When a circularly compressed product is used by passing it at room temperature, the twisted wire assembly partially undergoes work hardening during the die drawing process to become semi-hardened copper, which increases the tensile strength. It is possible to reduce the wire diameter. The tensile strength of such a semi-hardened copper stranded wire conductor is 29-40 kgf / mm, which is the same level as the conventional one, even if the diameter is reduced. In addition, since it is compressed, the substantial cross-sectional area of the current passage can be widened even if the outer diameter is small, and an increase in conductor resistance can be suppressed despite the small diameter.

The following techniques have been disclosed as known techniques for compressing a twisted wire with a die. -1. JP-B-59-47407… By performing compression with a die after the stranded wire conductor is electrically heated to soften it, heavy compression is possible and die wear can be prevented and the processing surface can be improved. -2. Unexamined Japanese Patent Publication No. 62-5517 ... By performing a die drawing process with a compression rate of 4 to 7% on a stranded wire conductor, a residual stress removing effect and a fusing property are obtained. -3. 59-175206: A method in which plated stranded wire is compressed and a collective coating layer is provided on the outer circumference. -4. Actually open Sho 61-127512 ... The outermost layer is welded and integrated by compressing the plated stranded wire.

However, unlike the problem of the above disclosed technology, the present invention uses a compressed stranded wire conductor having an appropriate tensile strength by forming a semi-hard copper by performing a die drawing process on an annealed copper stranded wire, and It manufactures electric wires for wiring.

That is, the electric wire for device wiring of the present invention is formed by twisting 7 to 19 annealed copper wires or tin-plated annealed copper wires and twisting them to have an outer diameter within a range of 0.22 mm to 1.9 mm. Manufactured by forming a wire assembly, passing the stranded wire assembly through a die having a hole diameter 5 to 20% smaller than its outer diameter at room temperature to circularly compress the wire assembly, and then covering it with an insulating resin. To be done. Then, a part of the stranded wire conductor undergoes work hardening to become semi-hardened copper during drawing with a die, so its tensile strength is the same level as the conventional one, 29-40 Kg f / mm2 of compressed annealed copper stranded wire. It is possible to manufacture a conductor, and moreover, even if the outer diameter of the conductor is reduced, the cross-sectional area can be wide and the conductivity can be kept high.

The range of the compression outer diameter ratio is set to 80 to 95% because the force required to pull out the conductor from the die must be equal to or less than the tensile strength of the conductor, or wire breakage will occur. This is because the ratio is about 80%, and if it is compressed below this value, many wire breaks occur, and if the outer diameter ratio is 95% or more, the effect of compressing the conductor and making it into semi-hardened copper cannot be obtained.

[0013]

【Example】

 Next, an embodiment of the present invention will be described. This is an example of an electric wire for equipment wiring with an outer diameter of 0.881 mmΦ that has been reduced in diameter until the outer diameter reaches 0.800 mmΦ. In other words, a normal stranded wire conductor with a conductor outer diameter of 0.381 mmΦ is compressed until the outer diameter reaches 0.311 mmΦ, and the diameter is reduced. First, considering the degree of stretching, tin-plated annealed copper wire or twisted annealed copper wire 5 has an outer diameter of 0.115 mmΦ, which is about 15% thicker than the compressed wire. As shown in Fig. 3, 7 strands are twisted together to form an annealed copper wire assembly 3 with an outer diameter D1 (approximately 0.345 mm).

Thereafter, a die drawing process (this compression outer diameter ratio is about 87%) is performed through a die having a hole diameter D2 (0.300 mm), and a semi-hard copper having a conductor outer diameter D2 (0.300 mm) shown in FIG. The compressed stranded conductor 2 is manufactured. On the outside of this semi-hard copper compressed stranded conductor 2, an insulation coating layer 1 with an insulation thickness of 0.25 mm (same as the conventional insulation thickness) is provided with plastic, and the device outer diameter of the wire shown in Fig. 1 is 0.800 mmΦ. Manufactures electric wires for use.

As the structure of the conductor for compression, there are various structures as shown in FIGS. 5 (a) to 5 (d) in addition to 7 cores, but the means is the same as that shown in the example. By the method, a target electric wire for device wiring can be obtained.

[0016]

[Effects of the embodiment]

 The effect of this embodiment is compared by comparing the electric wire for device wiring, which has been reduced in diameter by the present invention as shown in the above embodiment, with the reduced diameter electric wire by the conventional technique (example by the conventional technique in Table 1). explain.

[0017]

[Table 1] As shown in Table 1, the electric wire of the present invention is superior to the examples of the prior art in any of the conductor tensile strength, terminal fixing force, and conductor resistance value. Table 2 shows the improvement rate compared to the above. This is because the electric wire of the present example has a 60% increase in the conductor tensile strength, a 92 to 150% increase in the terminal fixing force, and a conductor resistance value of 18 when compared with the conventional electric wire in which the conductor is annealed copper. %is decreasing.

[0018]

[Table 2] Furthermore, Table 3 shows the performance of the wire outer diameter of 0.881 mmΦ before the diameter reduction.

[0019]

[Table 3] Comparing the example before performing the diameter reduction of Table 3 with this example of Table 1, the performance is as follows for the diameter reduction of 9% in the wire outer diameter and 17.5% in the wire cross-sectional area. The conductor tensile strength and the terminal fixing force are not reduced, and the conductor resistance value can be increased to 30% (60% to 146% increase in the related art by 60% increase). The electric wire having the above-mentioned characteristics and reduced in diameter obtained by the present invention can provide a sufficiently reliable electric wire for device wiring.

The diameter-reduced electric wire having the above-mentioned characteristics obtained by the present invention can obtain an electric wire having a small conductor resistance without decreasing the tensile strength and the terminal fixing force even if the diameter is reduced. Therefore, there are no causes of wire breakage, disconnection of electrical connectors, impedance mismatch, etc., and it is possible to manufacture highly reliable equipment. In addition, by producing a compression conductor with a compression outer diameter ratio in the range of 80 to 95% and using this compression conductor to reduce the outer diameter of the wire, effective use of the wiring space in the equipment and the spacing between the connector poles It is possible to provide an electric wire that is effective in reducing the size of equipment, as it can be used even when the size becomes narrow.

Moreover, since the twisted wire assembly 3 is circularly compressed by passing it through a die at room temperature, continuous processing can be performed and productivity can be improved as compared with forging. .

[0022]

[Effect of device]

 As described above, according to the electric wire for device wiring of the present invention, a twisted wire assembly having an outer diameter in the range of 0.22 mm to 1.9 mm is used as a twisted conductor and is 5 to 20% smaller than the outer diameter. It is circularly compressed by passing it through a die with a large hole diameter at room temperature, and this can partially work-harden annealed copper to make it into semi-hardened copper. The same level of tensile strength and terminal fixing force can be obtained, and the conductor resistance can be reduced. Further, since the twisted wire assembly is passed through a die at room temperature for compression processing, continuous processing is possible and productivity can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view of an electric wire showing an embodiment of the present invention.

FIG. 2 is a sectional view showing a conventional electric wire.

FIG. 3 is an end view of a twisted wire assembly according to an embodiment of the present invention.

FIG. 4 is an end view showing a stranded wire conductor similarly after die drawing.

FIG. 5 is an end view of a twisted wire assembly showing a wire configuration according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Insulating coating layer 2 ... Stranded wire conductor 3 ... Stranded wire assembly 4 ... Compressed twisted wire strand 5 ... Annealed copper twisted wire strand

Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location H01B 13/02 Z

Claims (1)

[Scope of utility model registration request] 1. A stranded wire conductor formed by twisting 7 to 19 strands of annealed copper wire or tin-plated annealed copper wire, and an electric insulating coating layer covering the outer periphery of the stranded wire conductor. Use a conductor that is obtained by circularly compressing a twisted wire assembly with an outer diameter in the range of 0.22 mm to 1.9 mm by passing it through a die with a hole diameter 5-20% smaller than the outer diameter at room temperature. An electric wire for device wiring, which is characterized by: