JP6023299B2 - Clad wire and cord for communication - Google Patents

Description

  The present invention relates to a clad wire and a cord for communication in devices and systems such as a network and sound.

  As a communication wire, for example, a composite wire in which an aluminum wire of Patent Document 1 for the purpose of weight reduction and conductivity improvement is coated with copper plating or copper cladding has been proposed. Further, Patent Document 2 suggests that when a communication wire vibrates, an electric signal is attenuated or causes noise, so that a fiber or a fiber structure covering for preventing vibration is coated on an electric wire. ing.

JP 2009-2801717 A JP 11-39952 A

  In the copper-coated aluminum composite wire of Patent Document 1, communication performance by vibration is not mentioned. Further, the cord of Patent Document 2 does not specifically show the vibration damping effect by covering the electric wire with a fiber or a fiber structure. In addition, when the electric wire is covered with a fiber or a fiber structure, the cord becomes thick and heavy. On the other hand, if the cord is made thin, the conductivity of the cord is lowered and the communication performance is lowered.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a clad wire for communication and a cord with improved communication performance and reduced weight.

  A clad wire for communication according to an aspect of the present invention includes a core material made of magnesium or a magnesium-based alloy, and a coating material made of a metal different from both magnesium and the magnesium-based alloy that covers the core material. .

  In this communication clad wire, the magnesium-based alloy may contain 80% by mass or more of magnesium. In the clad wire for communication, the different metal may be copper or a copper base alloy. Furthermore, in the clad wire for communication, the ratio of the cross-sectional area of the core material to the cross-sectional area of the covering material may be 0.06 or more and 1.2 or less. In the clad wire for communication, the outer diameter of the covering material may be 0.05 mm or greater and 10.0 mm or less.

  In the communication clad wire, the outer peripheral surface of the core material may be subjected to a surface treatment with a metal of gold, platinum, silver, zinc and tin or an alloy of this metal. Further, the communication clad wire may be formed by subjecting a wire rod whose outer peripheral surface of the core member is covered with the covering material to a diameter reduction process by compression. In the communication clad wire, the outer peripheral surface of the covering material may be covered with any of plastic, oil, carbon, and rubber.

  The cord is formed by twisting a plurality of the clad wires for communication. In this cord, the outer peripheral surface of the covering material may be covered with any one of plastic, oil, carbon, and rubber.

  INDUSTRIAL APPLICABILITY The present invention has an effect that it has a configuration as described above and can provide a communication clad wire and a cord that are improved in communication performance and reduced in weight.

  The above object, other objects, features and advantages of the present invention will become apparent from the following detailed description of preferred embodiments with reference to the accompanying drawings.

It is a perspective view which shows roughly the clad wire for communication which concerns on Embodiment 1 of this invention. It is sectional drawing which shows roughly the clad wire for communication which concerns on Embodiment 2 of this invention. It is sectional drawing which shows roughly the clad wire for communication which concerns on Embodiment 3 of this invention. It is a table | surface which shows the evaluation result of the clad wire for communication. It is a figure for demonstrating the measuring method of the vibration attenuation factor of the clad wire for communication. It is a table | surface which shows the evaluation result of the clad wire for communication.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference symbols throughout the drawings, and redundant description thereof is omitted. For convenience of explanation, the central axis side of the communication clad wire is referred to as the inner side, and the outer peripheral surface side of the communication clad wire is referred to as the outer side.

(Embodiment 1)
FIG. 1 is a perspective view schematically showing a clad wire 10 for communication. As shown in FIG. 1, the clad wire 10 for communication is used for wiring in equipment and systems such as communication and sound, and is a long electric wire having a circular or substantially circular cross section. For example, the outer diameter of the communication clad wire 10 is 0.05 mm or more and 10.0 mm or less. The communication clad wire 10 includes a core member 20 and a covering member 30.

  The core material 20 is a long linear object, and is composed of a single wire or a stranded wire. This stranded wire is a single linear object formed by twisting a plurality of wires. The core member 20 is disposed at the center of the communication clad wire 10 and extends in the longitudinal direction in parallel or substantially parallel to the central axis of the communication clad wire 10. The cross section of the core member 20 has a circular or substantially circular shape.

  The core material 20 is made of magnesium or a magnesium-based alloy. Magnesium contains 99.9% or more of the magnesium metal element and may contain very little impurities that are not intentionally added. The magnesium-based alloy is an alloy in which one or more kinds of other elements are added to the magnesium metal element, and contains 80% by mass or more of the magnesium metal element. Examples of other elements include aluminum, zinc, manganese, calcium, silicon, and lithium.

  The coating | covering material 30 is a long linear thing, Comprising: The cross section is ring shape. The inner peripheral surface of the covering material 30 is in contact with the outer peripheral surface of the core member 20, and the covering member 30 covers the outer peripheral surface of the core member 20. The outer diameter of the covering material 30 is set to 0.05 mm or more and 10.0 mm or less, for example. The ratio of the cross-sectional area of the core material 20 to the cross-sectional area of the covering material 30 (= the cross-sectional area of the core material 20 / the cross-sectional area of the covering material 30) is appropriately set depending on the performance required for the communication clad wire 10. For example, the ratio of the cross-sectional area is preferably 0.06 or more and 1.2 or less, more preferably 0.1 or more and 1.2 or less. When the ratio of the cross-sectional area is less than 0.1, the damping function of the communication clad wire 10 is low. However, depending on the required performance of the clad wire 10 for communication, even if the cross-sectional area ratio is less than 0.1, if the cross-sectional area ratio is 0.06 or more, the cross-sectional area ratio is less than 0.06. On the other hand, the logarithmic decay rate is greatly increased. Therefore, the communication clad wire 10 having a cross-sectional area ratio of 0.06 or more can sufficiently exhibit a vibration damping function that satisfies the required performance. On the other hand, when the ratio of the cross-sectional area is larger than 1.2, it is not preferable because the decrease in conductivity is larger than the improvement of the damping function of the communication clad wire 10.

  The covering material 30 is made of a metal (different metal) different from both magnesium and a magnesium-based alloy. As the dissimilar metal, a metal having an electric resistivity lower than that of magnesium, for example, any one of aluminum, copper, gold, and silver or an alloy thereof is preferable. Furthermore, copper or this alloy is preferable from the viewpoint of excellent workability, electrical conductivity, and low cost.

  The method for manufacturing the communication clad wire 10 is not particularly limited as long as the core member 20 and the covering member 30 are pressure-bonded, and a known method can be used. For example, the core material 20 is prepared by drawing a magnesium or magnesium-based alloy extruded material with a compressor or a drawing die until a predetermined outer diameter is obtained.

  Then, the core material 20 is covered with the covering material 30. As this covering method, for example, the core member 20 is covered with the covering member 30 by inserting the core member 20 into the tubular covering member 30. Alternatively, the core member 20 is disposed on the covering member 30 while bending both ends of the belt-like covering member 30 into an arc shape. Then, the covering material 30 is formed into a cylindrical shape, both end portions of the cylindrical covering material 30 are butted and welded, and the core material 20 is covered with the covering material 30.

  The wire rod in which the core member 20 is covered with the covering member 30 is compressed by a die, a rolling roller, or a swaging machine to reduce the diameter. Thereby, the core material 20 and the covering material 30 become thin and long while being in close contact with each other.

  According to the above configuration, the core material 20 of the communication clad wire 10 is formed of magnesium or a magnesium-based alloy. The vibration of the covering material 30 is suppressed by the core material 20 made of magnesium having a high vibration damping rate. As a result, it is possible to reduce noise and electric signal propagation interference due to vibration of the communication clad wire 10 and improve communication performance.

  Furthermore, the diameter reduction process by compression is given and the clad wire 10 for communication is formed. Thereby, when the core material 20 and the covering material 30 are in close contact with each other, the core material 20 more effectively reduces the vibration of the covering material 30, thereby reducing problems caused by vibration, and further improving communication performance. It is done.

  Further, the magnesium-based alloy used for the core material 20 contains 80% by mass or more of magnesium metal element. For this reason, even if the core material 20 is formed of a magnesium-based alloy instead of magnesium, the communication clad wire 10 can sufficiently exhibit the characteristics of magnesium.

  Furthermore, by using a dissimilar metal for the covering material 30, the characteristics of the dissimilar metal different from magnesium can be imparted to the communication clad wire 10. For example, the electrical resistance of the communication clad wire 10 can be kept low by using a metal having better conductivity than magnesium for the covering material 30. Among these, if the covering material 30 is made of copper or a copper-based alloy, conductivity and workability are further improved.

  Further, a metal having better conductivity than magnesium of the core material 20 is used for the covering material 30. Thereby, an electric current flows into the coating | covering material 30 around it rather than the core material 20 in the center of the clad wire 10 for communication by the skin effect. Thereby, compared with the clad wire in which the covering material 30 is made of magnesium and the core material 20 is made of a metal having better conductivity than magnesium, the loss in propagation of the electric signal in the communication clad wire 10 is suppressed.

  Furthermore, magnesium is lightweight and conductive. For this reason, the communication clad wire 10 made of magnesium and copper can be made thinner and lighter while maintaining higher conductivity than a cord in which an electric wire is covered with a fiber or the like.

  For example, if the ratio of the cross-sectional area of the core material 20 to the cross-sectional area of the covering material 30 is 0.1 or more, the electrical resistance of the communication clad wire 10 is only about 10% higher than that of the copper wire. The logarithmic decay rate becomes twice or more. Further, if the ratio of the cross-sectional area is 1.2 or less, the electrical resistance can be suppressed to nearly half while maintaining the logarithmic attenuation rate of the communication clad wire 10 at about 90% compared to the magnesium wire. Thereby, by making the ratio of the cross-sectional area 0.1 or more and 1.2 or less, the communication clad wire 10 can exhibit the vibration damping function of the core member 20 while maintaining the conductive performance.

  Furthermore, if the ratio of the cross-sectional area of the core material 20 to the cross-sectional area of the covering material 30 is 0.06 or more, the electrical resistance of the communication clad wire 10 is only about 0.1% higher than that of the copper wire. On the other hand, the logarithmic decay rate is about 1.5 times. Thus, the communication clad wire 10 can exhibit the vibration damping function of the core member 20 while maintaining the conductive performance.

  Furthermore, the outer diameters of the core material 20 and the covering material 30 are set to, for example, 0.05 mm or more and 10.0 mm or less. The communication clad wire 10 manufactured with this diameter can be used as an electric member.

(Embodiment 2)
The communication clad wire 10 according to the second embodiment is surface-treated, and this point is different from the communication clad wire 10 according to the first embodiment, but is otherwise the same. FIG. 2 is a cross-sectional view showing the communication clad wire 10 according to the second embodiment. In FIG. 2, the thickness of the surface treatment layer 40 is shown large for easy understanding, but the surface treatment layer 40 is thinner than this.

  As shown in FIG. 2, the outer peripheral surface of the core material 20 is subjected to surface treatment. Examples of the surface treatment include plating (wet plating) and vapor deposition (dry plating). Surface treatment is performed on the outer peripheral surface of the core member 20, and the core member 20 is covered with the covering member 30 to reduce the diameter. Thereby, the outer peripheral surface of the core material 20 is covered with the thin film (surface treatment layer) 40, and the surface treatment layer 40 is provided between the core material 20 and the covering material 30.

  The surface treatment layer 40 is formed of a metal having high corrosion resistance, for example, a metal having a smaller ionization tendency than magnesium of the core material 20. Examples of the metal having a small ionization tendency include any one of copper, gold, platinum, silver, zinc and tin, or an alloy of this metal. The metal of the surface treatment layer 40 is appropriately selected depending on the required characteristics of the communication clad wire 10 and the type of metal of the covering material 30.

  According to the above configuration, the surface treatment layer 40 is interposed between the core material 20 and the covering material 30. Thereby, the surface treatment layer 40 can reduce or prevent the generation of reaction products formed when the magnesium of the core material 20 contacts the dissimilar metal of the coating material 30.

(Embodiment 3)
The communication clad wire 10 according to the third embodiment is covered, and this point is different from the communication clad wire 10 according to the first embodiment, but the other points are the same. FIG. 3 is a cross-sectional view showing the communication clad wire 10 according to the third embodiment.

  As shown in FIG. 3, the outer peripheral surface of the coating | covering material 30 is coat | covered with the materials in any one of a plastic, fats and oils, carbon, and rubber | gum, for example. Thereby, since the outer peripheral surface of the covering material 30 is covered with the covering layer 50, the covering material 30 is protected by the covering layer 50.

  Moreover, the material of the coating layer 50 is appropriately selected according to the purpose of coating. For example, if an electrical insulator is used for the covering layer 50, the covering layer 50 prevents leakage of the communication clad wire 10. Further, if a thermal insulator is used for the covering layer 50, the covering layer 50 improves the fire resistance of the communication clad wire 10 and the like.

  In addition, also in the communication clad wire 10 according to the third embodiment, as in the second embodiment, the outer peripheral surface of the core member 20 may be subjected to a surface treatment. Thereby, generation | occurrence | production of the reaction product by the core material 20 and the coating | covering material 30 can be reduced or prevented.

(Embodiment 4)
In all the embodiments described above, the communication clad wire 10 is composed of one wire. On the other hand, you may form a code | cord | chord with the strand wire which twisted several the clad wires 10 for communication. Thus, by using the communication clad wire 10 as a stranded wire, the flexibility of the cord can be increased as compared with a single wire having the same diameter.

(Other embodiments)
You may heat-process the clad wire 10 for communication which concerns on all the said embodiments. In this heat treatment, for example, the communication clad wire 10 is heated at 200 ° C. or higher for a predetermined time. Even when the communication clad wire 10 is hardened and brittle by the diameter reduction processing by compression, the ductility of the communication clad wire 10 can be recovered by heat treatment.

(Example)
Next, the result of having evaluated the property of the clad wire 10 for communication using Examples 1-3 and Comparative Examples 1-2 is demonstrated. FIG. 4 is a table showing the evaluation results of the communication clad wire 10. In this evaluation, specific gravity, electrical resistance, and logarithmic decay rate were measured. The ratio 1 between the electrical resistance and the logarithmic decay rate indicates the electrical resistance and logarithmic decay rate of each wire with respect to the electrical resistance and logarithmic decay rate of the copper wire of Comparative Example 1. The ratio 2 of the electrical resistance and the logarithmic decay rate indicates the electrical resistance and logarithmic decay rate of each wire with respect to the electrical resistance and logarithmic decay rate of the magnesium wire of Comparative Example 2. This electric resistance was measured by measuring a DC resistance value having a length of 500 mm. As shown in FIG. 5, the vibration damping rate is set such that a wire is placed on two support bases that are spaced from each other at an interval L, a weight T is suspended from one end of the wire, and the wire is stretched. The change in sound pressure (dB) was measured by vibrating the wire between the two support bases. At this time, the initial natural frequency of each wire was adjusted to 160 Hz.

  The clad wires 10 for communication of Examples 1 to 3 were prepared by inserting a magnesium wire into a copper tube having a diameter of 5.0 mm, drawing it with a die to a diameter of 1.2 mm, and performing a heat treatment at 200 ° C. for 1 minute. did. The first embodiment is a communication clad wire 10 in which the ratio of the cross-sectional area of the core member 20 to the cross-sectional area of the covering member 30 is 0.1. Example 2 is the communication clad wire 10 in which the ratio of the cross-sectional area of the core member 20 to the cross-sectional area of the covering member 30 is 0.4. Example 3 is the communication clad wire 10 in which the ratio of the cross-sectional area of the core member 20 to the cross-sectional area of the covering member 30 is 1.2. Comparative Example 1 is a copper wire having a diameter of 1.2 mm, and Comparative Example 2 is a magnesium wire having a diameter of 1.2 mm.

  As shown in the evaluation results of FIG. 4, in Example 1 having a cross-sectional area ratio of 0.1, the electrical resistance is 1.1 and 10% larger than that of the copper wire of Comparative Example 1, but the logarithmic attenuation factor Is 2.9 times. On the other hand, in Example 3 where the ratio of the cross-sectional area is 1.2, the logarithmic decay rate is maintained at about 0.9 and 90% as compared with the magnesium wire of Comparative Example 2, and the electrical resistance is about 0.6 and 60%. It can be kept low.

  Next, the results of evaluating the properties of the communication clad wire 10 using Examples 1 to 5 and Comparative Examples 1 to 2 will be described with reference to FIGS. 4 and 6. FIG. 6 is a graph showing the specific gravity, electrical resistance, and logarithmic decay rate of the communication clad wire 10. The specific gravity, electrical resistance, and logarithmic decay rate are measured in the same manner as in the evaluation of FIG. The vertical axis in FIG. 6 is the ratio of the specific gravity, logarithmic decay rate, and electrical resistivity of Comparative Example 1. 6 represents the ratio of the cross-sectional area of the core material 20 to the cross-sectional area of the wire (= the cross-sectional area of the core material 20 / the cross-sectional area of the wire (clad wire 10 for communication)) (%).

  In this evaluation, Examples 1 to 5 and Comparative Examples 1 and 2 were used. Among these, the wires of Examples 1 to 3 and Comparative Examples 1 and 2 are the same as the wires used in the evaluation of FIG. The clad wire 10 for communication of Examples 4 and 5 was prepared by inserting a magnesium wire into a copper tube having a diameter of 5.0 mm, drawing the wire to a diameter of 1.2 mm with a die, and performing a heat treatment at 200 ° C. for 1 minute. did. In Example 4, the ratio of the cross-sectional area of the core material 20 to the cross-sectional area of the covering material 30 (the cross-sectional area ratio of the core material 20) is 0.06, and the core material 20 has a cross-sectional area of the communication clad wire 10. The ratio of the cross-sectional area (the cross-sectional area ratio of the core material 20) is 5.3%. In Example 5, the cross-sectional area ratio of the core material 20 is 0.25, and the cross-sectional area ratio of the core material 20 is 20%.

  As shown in the evaluation results of FIGS. 4 and 6, the cross-sectional area ratio of the core material 20 is changed from 5.3% to 10.6% (the cross-sectional area ratio of the core material 20 is changed from 0.06 to 0.10). The slope (change ratio) of the logarithmic decay rate of the communication clad wire 10 in the range is larger than the other ranges. If the ratio of the cross-sectional area of the core member 20 to the cross-sectional area of the covering member 30 is 0.06 or more, the electrical resistance of the communication clad wire 10 is only about 0.1% higher than that of the copper wire. On the other hand, the logarithmic decay rate is about 1.5 times. Thus, in the range where the cross-sectional area ratio of the core material 20 is 5.3% or more (the cross-sectional area ratio of the core material 20 is 0.06), the communication clad wire 10 is vibration-damped while maintaining the conductive performance. The function can be demonstrated.

  Note that all the above embodiments may be combined with each other as long as they do not exclude each other. From the above description, many modifications and other embodiments of the present invention are obvious to those skilled in the art. Accordingly, the foregoing description should be construed as illustrative only and is provided for the purpose of teaching those skilled in the art the best mode of carrying out the invention. The details of the structure and / or function may be substantially changed without departing from the spirit of the invention.

  The clad wire for communication and the cord of the present invention are useful as a clad wire for communication and a cord for improving the communication performance and reducing the weight.

10: Clad wire for communication 11: Stranded wire 20: Core material 30: Coating material 40: Surface treatment layer 50: Coating layer

Claims (10)

A core made of magnesium or a magnesium-based alloy;
A clad wire for communication, comprising: a coating material made of a metal different from any of magnesium and a magnesium-based alloy that coats the core material.   The clad wire for communication according to claim 1, wherein the magnesium-based alloy contains 80 mass% or more of magnesium.   The clad wire for communication according to claim 1 or 2, wherein the different metal is copper or a copper-based alloy.   The clad wire for communication according to any one of claims 1 to 3, wherein a ratio of a cross-sectional area of the core material to a cross-sectional area of the covering material is 0.06 or more and 1.2 or less.   The clad wire for communication according to any one of claims 1 to 4, wherein an outer diameter of the covering material is 0.05 mm or more and 10.0 mm or less.   The communication according to any one of claims 1 to 5, wherein a surface treatment with a metal of gold, platinum, silver, zinc, or tin or an alloy of the metal is performed on an outer peripheral surface of the core material. Clad wire.   The clad wire for communication according to any one of claims 1 to 6, which is formed by subjecting a wire whose outer peripheral surface of the core material is covered with the covering material to diameter reduction processing by compression.   The clad wire for communication according to any one of claims 1 to 7, wherein an outer peripheral surface of the covering material is covered with any one of plastic, fats and oils, carbon, and rubber.   A cord formed by twisting a plurality of the clad wires for communication according to any one of claims 1 to 8.   The cord according to claim 9, wherein an outer peripheral surface of the covering material is covered with any one of plastic, oil and fat, carbon, and rubber.