KR101513531B1 - Wire by extrusion and method of fabricating the same - Google Patents

Wire by extrusion and method of fabricating the same Download PDF

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KR101513531B1
KR101513531B1 KR1020140012608A KR20140012608A KR101513531B1 KR 101513531 B1 KR101513531 B1 KR 101513531B1 KR 1020140012608 A KR1020140012608 A KR 1020140012608A KR 20140012608 A KR20140012608 A KR 20140012608A KR 101513531 B1 KR101513531 B1 KR 101513531B1
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South Korea
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cylindrical units
cylindrical
wire
material layer
preform
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KR1020140012608A
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Korean (ko)
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김휘준
이주호
이창우
황호영
황규철
정하국
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한국생산기술연구원
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/04—Making uncoated products by direct extrusion
    • B21C23/08—Making wire, bars, tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/22—Making metal-coated products; Making products from two or more metals

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Of Metal (AREA)
  • Conductive Materials (AREA)

Abstract

The present invention relates to a wire by extrusion and a method of fabricating the same, and provides a wire by extrusion with high tensile strength, elongation percentage, and conductivity, by comprising the steps of: placing a plurality first cylindrical unit made from a first material with different diameter to be distant from each other in a shape of a growth ring; placing a plurality of second cylindrical unit made from a second material with different diameter to be distant from each other between the plurality of first cylindrical unit which are distant from each other in the shape of a growth ring; and extruding the preliminary molded object made of the plurality of first cylindrical unit and the plurality of second cylindrical unit in a longitudinal direction, the first material having a greater tensile strength than that of the second material, and the second material having a greater elongation percentage and conductivity than those of the first material.

Description

Technical Field [0001] The present invention relates to an extruded wire rod,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extruded wire and a method of manufacturing the same. More particularly, the present invention relates to an extruded extruded wire and a method for manufacturing the extruded wire.

In general, copper wires have a high electrical conductivity, but they are disadvantageous in weight reduction due to their high specific gravity (8.9 g / cm 3 ). For example, a copper wire disposed between a wire or a tower may have a problem that the wire is squeezed and stretched due to its own weight, thereby limiting the amount of power that can be transmitted.

In order to overcome these problems, aluminum wires are attracting attention. Aluminum has a lower electrical conductivity than copper, so aluminum wires can make up to 30% more cable than copper wires, but can weigh more than 40%, which can contribute to lighter weight.

<Prior Art Literature>

Korean Patent Publication No. 2010-0058676 (2010.06.03)

However, as a material of such conventional aluminum wires, pure aluminum has a low strength and aluminum alloy has a low elongation and low electrical conductivity, which makes it unsuitable for use in aluminum wires.

It is an object of the present invention to provide an aluminum wire having a high tensile strength and high elongation and electrical conductivity at the same time, and a method of manufacturing the same. Further, it is an object of the present invention to provide an extruded wire having a high tensile strength and simultaneously an elongation and an electrical conductivity, and a method for producing the extruded wire. However, these problems are exemplary and do not limit the scope of the present invention.

An extruded wire rod according to one aspect of the present invention is provided. The extruded wire rod includes a plurality of first material layers in a ring-shaped cross-section spaced apart from each other and a second material layer filling between the plurality of first material layers spaced apart from each other. The first material layer has a greater tensile strength than the second material layer and the second material layer has a higher elongation and electrical conductivity than the first material layer.

In the extruded wire, the first material layer may include a 6000 series aluminum alloy, and the second material layer may include 1000 series of aluminum.

A method of manufacturing an extruded wire rod according to another aspect of the present invention is provided. The method of manufacturing an extruded wire rod includes the steps of disposing a plurality of cylindrical units of different diameters, each of which is made of a first material, in a ring shape and spaced apart from each other; Packing and arranging a plurality of wire rods made of a second material between the plurality of cylindrical units separated from each other; And extruding the preformed body including the plurality of cylindrical units and the plurality of wire rods in the longitudinal direction. The first material has a higher tensile strength than the second material and the second material has higher elongation and electrical conductivity than the first material.

In the method of manufacturing an extruded wire rod, the cross-sectional area occupied by the plurality of wire rods among the plurality of cylindrical units and the plurality of wire rods may be 50 to 80%.

In the method of manufacturing the extruded wire, the first material may be an aluminum alloy of 6000 series, and the second material may be 1000 series aluminum.

 A method for manufacturing an extruded wire rod according to another aspect of the present invention is provided. The method of manufacturing an extruded wire rod includes the steps of disposing a plurality of first cylindrical units different in diameter from each other in a ring shape and made of a first material; Disposing a plurality of second cylindrical units made of a second material and different in diameter from each other in a ring shape, between the plurality of first cylindrical units spaced apart from each other; And extruding the preformed body made up of the plurality of first cylindrical units and the plurality of second cylindrical units in the longitudinal direction. The first material has a higher tensile strength than the second material and the second material has higher elongation and electrical conductivity than the first material.

In the method of manufacturing an extruded wire rod, the cross-sectional area occupied by the plurality of second cylindrical units among the plurality of first cylindrical units and the plurality of second cylindrical units may be 50 to 80%.

In the method of manufacturing the extruded wire, the first material may be an aluminum alloy of 6000 series, and the second material may be 1000 series aluminum.

An extruded wire rod according to another aspect of the present invention is provided. The extruded wire rod is realized by the above-described manufacturing method.

According to one embodiment of the present invention as described above, an extruded wire having a high tensile strength, elongation, and electrical conductivity at the same time and a method of manufacturing the extruded wire can be provided. Of course, the scope of the present invention is not limited by these effects.

1 is a cross-sectional view illustrating a cross section of an extruded wire according to an embodiment of the present invention.
2 is a diagram illustrating a preform for implementing an extruded wire according to an embodiment of the present invention.
3 is a diagram illustrating an extrusion die for implementing an extruded wire according to an embodiment of the present invention.
4 is a diagram illustrating a modified preform for implementing an extruded wire according to another embodiment of the present invention.
5 is a photograph of preforms for realizing an extruded wire according to an experimental example of the present invention.
FIG. 6 is a photograph of the extruded wire rod according to the experimental example of the present invention taken after 1/4 cutting.
FIG. 7 is a photograph of microstructures of the extruded wire according to Experimental Example of the present invention. FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiments of the present invention are described in order to more fully explain the present invention to those skilled in the art, and the following embodiments may be modified into various other forms, The present invention is not limited to the embodiment. Rather, these embodiments are provided so that this disclosure will be more thorough and complete, and will fully convey the concept of the invention to those skilled in the art. In the drawings, the thickness and size of each layer are exaggerated for convenience and clarity of explanation.

Like numbers refer to like elements throughout the specification. As used herein, the term "and / or" includes any and all combinations of one or more of the listed items. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a," "an," and "the" include singular forms unless the context clearly dictates otherwise. Also, &quot; comprise "and / or" comprising "when used herein should be interpreted as specifying the presence of stated shapes, numbers, steps, operations, elements, elements, and / And does not preclude the presence or addition of one or more other features, integers, operations, elements, elements, and / or groups.

In the figures, for example, variations in the shape shown may be expected, depending on manufacturing techniques and / or tolerances. Accordingly, the embodiments of the present invention should not be construed as limited to the particular shapes of the regions shown herein, but should include, for example, changes in shape resulting from manufacturing.

In the embodiments of the present invention, pure aluminum may include impurities (hereinafter, inevitable impurities) which are not intentionally added but inevitably contained in the manufacturing process even when not specifically mentioned.

FIG. 1 is a cross-sectional view illustrating a section of an extruded wire according to an embodiment of the present invention. FIG. 2 is a diagram illustrating a preform for implementing an extruded wire according to an embodiment of the present invention. 1 is an illustration of an extrusion die for implementing an extruded wire according to an embodiment of the present invention.

1, an extruded wire rod 100 according to an embodiment of the present invention includes a plurality of (two or more) first material layers 140 having a ring shape spaced apart from each other in a cross section and a plurality of And a second material layer 120 filling between the material layers. The extruded wire rod 100 is a wire rod extending in the longitudinal direction (Z direction), and the cross section is a cross section (XY plane) perpendicular to the longitudinal direction. The extruded wire 100 can be understood as a composite wire comprising a first material layer 140 and a second material layer 120 embodied by extrusion.

The first material layer 140 has a greater tensile strength than the second material layer 120 and the second material layer 120 has a higher elongation and electrical conductivity than the first material layer 140. For example, the first material layer 140 may include an Al-Mg-Si alloy 6000 series aluminum alloy, and the second material layer 120 may include 1000 series aluminum.

6000 series aluminum alloys are very useful as general material with excellent strength and excellent corrosion resistance and molding processability. 6063 alloy, which is a typical Al-Mg-Si alloy, has excellent extrudability and surface treatment properties and is widely used as a chassis material for construction. On the other hand, 6061 alloy, which is one of the Al-Mg-Si alloys, has lower extrudability than 6063 alloy, but has higher mechanical strength than 6063 alloy and is used in steel towers, cranes and automobile bumpers that require light weight and high strength. The 6061 alloy is an alloy which is made by adding magnesium and silicon to the composition of 6063 alloy to increase the amount of precipitate to improve the strength.

Specifically, the first material layer 140 is formed of a material selected from the group consisting of 0.8% to 1.2% magnesium (Mg), 0.4% to 0.8% silicon (Si), 0.70% iron (Fe), 0.15% 6061 alloy made of Al (Cu), 0.15% of manganese (Mn), 0.04% to 0.3% of chromium (Cr), 0.20% of zinc (Zn), 0.15% of titanium . The 6061 alloy has a tensile strength of 302 MPa, an elongation of 16% and an electrical conductivity of 40.5 IACS%.

Pure aluminum includes high purity aluminum of 99.9% purity or more and pure aluminum of 99.0% to 99.8% purity. High purity aluminum has excellent electrical properties and is used as a functional material in the field of electronic information. Industrial pure aluminum has excellent mechanical and chemical properties such as formability, corrosion resistance, and surface treatment, and is used in food and beverage packaging, construction, transportation, and the like. For example, 99.00% purity aluminum can be referred to as 1100 alloy, purity 99.70% aluminum 1070 alloy, purity 99.50% aluminum 1050 alloy.

Specifically, the second material layer 120 may include less than 0.25% Si, less than 0.40% Fe, less than 0.05% copper, less than 0.05% manganese, less than 0.05% (Al) of less than 0.05% magnesium (Mg), less than 0.05% zinc (Zn), less than 0.03% titanium (Ti), and more than 99.5% aluminum (Al).

A plurality of first material layers 140, which are shown in the cross-section of the extruded wire 100 according to an embodiment of the present invention, are arranged in a ring shape, at least partially spaced from each other. The ring shape means an arbitrary plurality of shapes (e.g., circular, elliptical, polygonal, or irregular) that are overlapped while the radius is discontinuously increased starting from the central axis parallel to the longitudinal direction (Z direction) of the extruded wire member 100. [ .

The exemplary first material layer 140 shown in FIG. 1 has a first radius, a second radius, a third radius, and a second radius that discontinuously increase from a central axis parallel to the longitudinal direction (Z direction) of the extruded wire 100 And are arranged in the form of concentric circles having a fourth radius. The second material layer 120 fills between the ring-shaped first material layers 140 arranged in concentric circles having the first radius, the second radius, the third radius, and the fourth radius, respectively. 1, the second material layer 120 and the first material layer 140 are repeatedly formed along the radial direction starting from a central axis parallel to the longitudinal direction (Z direction) Respectively.

1 to 3, a method of manufacturing an extruded wire 100 according to an embodiment of the present invention includes a plurality of cylindrical units 140a having different diameters and made of a first material, (S10); (S20) packing and arranging a plurality of wire rods 120a made of a second material between a plurality of cylindrical units 140a spaced from each other; And a step (S30) of extruding a preform 100a made up of a plurality of cylindrical units 140a and a plurality of wire rods 120a in the longitudinal direction (Z direction).

That is, to realize the extruded wire member 100 by extruding the preform 100a, the plurality of cylindrical units 140a shown in FIG. 2 are formed by the extrusion process into the first material layer 140 shown in FIG. 1 And the plurality of wire rods 120a shown in Fig. 2 are formed into the second material layer 120 shown in Fig. 1 by an extrusion process.

A plurality of wire rods 120a made of a second material are packed between a plurality of cylindrical units 140a spaced apart from each other in a ring shape and a plurality of cylindrical units 140a spaced apart from each other The placing step S20 may be performed sequentially, concurrently or partially in reverse order.

In constructing the preform 100a, a plurality of wire rods 120a interposed between the plurality of cylindrical units 140a may be arranged in a densest form as much as possible in order to minimize pores. 2, a plurality of wire rods 120a interposed between one cylindrical unit 140a and another adjacent cylindrical unit 140a are arranged by forming one row, but in some cases, Or may be disposed while forming a plurality of rows.

The first material constituting the plurality of cylindrical units 140a has a higher tensile strength than the second material constituting the plurality of wire rods 120a, but has lower elongation and electrical conductivity. For example, the first material may include an Al-Mg-Si alloy 6000 series aluminum alloy, and the second material may include 1000 series aluminum. And is omitted here.

The extrusion die 200 shown in Fig. 3 can be used for the step S30 of extruding the preform 100a in the longitudinal direction (Z direction). The extrusion process is performed using an extrusion die 200 including an inlet 210 into which the preform 100a enters and a body 220 having an outlet 230 through which the preform 100a is extruded do. For example, if the diameter of the inlet 210 is 49.7 mm and the diameter of the outlet 230 is 12.8 mm, the extrusion ratio, which is the rate of cross sectional area reduction in the extrusion process, can be 15: 1.

The present inventors have found that a plurality of cylindrical units 140a constituting the preform 100a and a plurality of wire rods 120a among the plurality of wire rods 120a occupy 50% To 80%, it was confirmed that the tensile strength, elongation and electrical conductivity required for the aluminum wire can be satisfied at the same time.

Meanwhile, according to the modified embodiment of the present invention, the preform for implementing the extruded wire 100 can be configured in a different manner. 4 is a diagram illustrating a modified preform for implementing an extruded wire according to another embodiment of the present invention.

1, 3 and 4, a method of manufacturing an extruded wire 100 according to another embodiment of the present invention includes a plurality of first cylindrical units 140b having different diameters and made of a first material, (S100) in a ring shape; (S200) of arranging a plurality of second cylindrical units (120b) made of a second material and different in diameter from each other in a ring-like shape between a plurality of first cylindrical units (140b) ; And a step S300 of extruding the preform 100b made up of the plurality of first cylindrical units 140b and the plurality of second cylindrical units 120b in the longitudinal direction.

That is, in order to realize the extruded wire member 100 by extruding the preform 100b, the plurality of first cylindrical units 140b shown in FIG. 4 are extruded to form the first material layer 140 And the plurality of second cylindrical units 120b shown in Fig. 4 are formed into the second material layer 120 shown in Fig. 1 by an extrusion process.

The step (S100) of disposing the plurality of first cylindrical units 140b apart from each other in a ring shape and the step S200 of disposing the plurality of second cylindrical units 120b apart from each other may be performed sequentially or simultaneously Or at least partially in the reverse order.

In forming the preform 100b, an empty space may be provided between the first cylindrical unit 140b and the second cylindrical unit 120b, but in the modified embodiment, the empty space is not interposed, The second cylindrical unit 120b and the second cylindrical unit 120b may be disposed to be in contact with each other.

The first material constituting the plurality of first cylindrical units 140b has a higher tensile strength than the second material constituting the plurality of second cylindrical units 120b but has lower elongation and electrical conductivity. For example, the first material may include an Al-Mg-Si alloy 6000 series aluminum alloy, and the second material may include 1000 series aluminum. And is omitted here.

The extrusion die 200 shown in Fig. 3 can be used for the step S300 of extruding the preform 100b in the longitudinal direction (Z direction). The extrusion process is performed using an extrusion die 200 including an inlet 210 into which the preform 100b enters and a body 220 having an outlet 230 through which the preform 100b is advanced while being extruded do. For example, if the diameter of the inlet 210 is 49.7 mm and the diameter of the outlet 230 is 12.8 mm, the extrusion ratio, which is the rate of cross sectional area reduction in the extrusion process, can be 15: 1.

The present inventors have found that a plurality of first cylindrical units 140b constituting the preform 100b and a plurality of second cylindrical units 120b among a plurality of second cylindrical units 120b, ) Was 50% to 80%, it was confirmed that the tensile strength, elongation and electrical conductivity required for the aluminum wire can be satisfied at the same time.

Hereinafter, experimental examples to which the above-described technical ideas are applied will be described in order to facilitate understanding of the present invention. It should be understood, however, that the following examples are for the purpose of promoting understanding of the present invention and are not intended to limit the scope of the present invention.

Experimental Example 1

The preform 100a shown in FIG. 5 (a) is prepared, which corresponds to the configuration of the preform shown in FIG. The preform 100a includes a plurality of cylindrical members 140a made of an aluminum 6061 alloy and a plurality of wires 120a made of an aluminum 1050 alloy (pure aluminum having a purity of 99.50%). A plurality of cylindrical units 140a having different diameters are disposed in a ring shape and spaced apart from each other in a ring shape, and the plurality of wire members 120a are packed between a plurality of cylindrical units 140a spaced from each other.

Particularly, in Experimental Example 1, the cross sectional area occupied by the plurality of wire members 120a among the plurality of cylindrical units 140a and the plurality of wire members 120a constituting the preform 100a is 50%. The first cylindrical unit 140a has an inner diameter of 2.15 mm and an outer diameter of 6 mm, and the second cylindrical unit 140a has a diameter The third cylindrical unit 140a has an inner diameter of 18.3 mm and an outer diameter of 22.2 mm. The fourth cylindrical unit 140a has an inner diameter of 26.4 mm and an outer diameter of 30.3 mm. The outer diameter of the third cylindrical unit 140a is 10.2 mm, , The fifth cylindrical unit 140a has an inner diameter of 34.5 mm and an outer diameter of 38.4 mm. The sixth cylindrical unit 140a has an inner diameter of 43.1 mm and an outer diameter of 46.5 mm. The length of each of the plurality of cylindrical units 140a is 92 mm.

Experimental Example 2

The preform 100a shown in FIG. 5 (b) is prepared, which corresponds to the configuration of the preform shown in FIG. The preform 100a includes a plurality of cylindrical members 140a made of an aluminum 6061 alloy and a plurality of wires 120a made of an aluminum 1050 alloy (pure aluminum having a purity of 99.50%). A plurality of cylindrical units 140a having different diameters are disposed in a ring shape and spaced apart from each other in a ring shape, and the plurality of wire members 120a are packed between a plurality of cylindrical units 140a spaced from each other.

Particularly, in Experimental Example 2, the cross-sectional area ratio occupied by the plurality of wire members 120a among the plurality of cylindrical units 140a and the plurality of wire members 120a constituting the preform 100a is 65%. The first cylindrical unit 140a has an inner diameter of 2.15 mm and an outer diameter of 3.8 mm. The first cylindrical unit 140a has a first cylindrical shape and a second cylindrical shape. The unit 140a has an inner diameter of 8 mm and an outer diameter of 10 mm. The third cylindrical unit 140a has an inner diameter of 14.2 mm and an outer diameter of 16.2 mm. The fourth cylindrical unit 140a has an inner diameter of 20.4 mm and an outer diameter of 22.4 mm. The fifth cylindrical unit 140a has an inner diameter of 26.6 mm and an outer diameter of 28.6 mm. The sixth cylindrical unit 140a has an inner diameter of 32.8 mm and an outer diameter of 34.8 mm. The seventh cylindrical unit 140a has an inner diameter of 39 mm The outer diameter is 41 mm, the eighth cylindrical unit 140a has an inner diameter of 45.2 mm and an outer diameter of 46.4 mm. The length of each of the plurality of cylindrical units 140a is 92 mm.

Experimental Example 3

The preform 100a shown in Fig. 5C is prepared, which corresponds to the preform formation shown in Fig. The preform 100a includes a plurality of cylindrical members 140a made of an aluminum 6061 alloy and a plurality of wires 120a made of an aluminum 1050 alloy (pure aluminum having a purity of 99.50%). A plurality of cylindrical units 140a having different diameters are disposed in a ring shape and spaced apart from each other in a ring shape, and the plurality of wire members 120a are packed between a plurality of cylindrical units 140a spaced from each other.

Particularly, in Experimental Example 3, the sectional area ratio occupied by the plurality of wire members 120a among the plurality of cylindrical units 140a and the plurality of wire members 120a constituting the preform 100a is 80%. The first cylindrical unit 140a has an inner diameter of 2.15 mm and an outer diameter of 3.4 mm, and the second cylindrical unit 140a has an inner diameter The unit 140a has an inner diameter of 7.6 mm and an outer diameter of 8.8 mm. The third cylindrical unit 140a has an inner diameter of 13 mm and an outer diameter of 14.2 mm. The fourth cylindrical unit 140a has an inner diameter of 18.4 mm and an outer diameter of 19.6 mm , The fifth cylindrical unit 140a has an inner diameter of 23.8 mm and an outer diameter of 25 mm. The sixth cylindrical unit 140a has an inner diameter of 29.2 mm and an outer diameter of 30.4 mm. The seventh cylindrical unit 140a has an inner diameter of 34.6 mm And the eighth cylindrical unit 140a has an inner diameter of 40 mm and an outer diameter of 41.2 mm. The ninth cylindrical unit 140a has an inner diameter of 45.4 mm and an outer diameter of 46.4 mm. The length of each of the plurality of cylindrical units 140a is 92 mm.

The extrusion process was performed under the conditions shown in Table 1 for the experimental conditions of the above conditions and the tensile strength, elongation and electric conductivity measured in the extruded wire material (for example, 100 in FIG. 1) 2 were compared with comparative examples.

Figure 112014010962423-pat00001

Figure 112014010962423-pat00002

Referring to Table 2, the wire rod made of pure aluminum (Comparative Example 1) has a relatively high elongation and electrical conductivity but a relatively low tensile strength, and the wire rod composed of the 6061 alloy, which is an aluminum alloy (Comparative Example 2) The strength is relatively high, but elongation and electrical conductivity are relatively low, so it is inappropriate to apply it to aluminum wires.

However, it can be confirmed that the extruded wires (Experimental Examples 1 to 3) implemented by the experimental examples of the present invention can be applied to an aluminum wire because the tensile strength, the elongation and the electric conductivity are both relatively high. That is, when the cross-sectional area ratio occupied by the plurality of wire rods 120a among the plurality of cylindrical units 140a and the plurality of wire rods 120a constituting the preform 100a is, for example, 50% to 80% It was confirmed that the tensile strength, elongation and electrical conductivity required for electric wires can be satisfied at the same time.

However, this cross-sectional area ratio is only an exemplary range by experiment, and the technical idea of the present invention is not limited thereto. For example, the cross-sectional area occupied by the plurality of wire rods 120a among the plurality of cylindrical units 140a and the plurality of wire rods 120a constituting the preform 100a may be 50% or less or 80% or more.

On the other hand, the microstructure of the extruded wire 100 according to Experimental Example 1, Experimental Example 2 and Experimental Example 3 was confirmed to be good in FIGS. 7 (a), 7 (b) and 7 (c).

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

100: extruded wire rod
100a, 100b: preform
120: a second material layer (for example A1050)
140: a first material layer (e.g. A6061)
200: extrusion die

Claims (9)

A plurality of first material layers in a ring-shaped cross-section spaced from each other; And
A second material layer filling between the plurality of first material layers spaced apart from each other;
/ RTI &gt;
Wherein the first material layer has a greater tensile strength than the second material layer and the second material layer has a higher elongation and electrical conductivity than the first material layer. The method according to claim 1,
Wherein the first material layer comprises a 6000 series aluminum alloy and the second material layer comprises 1000 series of aluminum. Disposing a plurality of cylindrical units made of a first material different in diameter from each other in a ring shape;
Packing and arranging a plurality of wire rods made of a second material between the plurality of cylindrical units separated from each other; And
Extruding a plurality of cylindrical units and a preformed body made of the plurality of wire rods in a longitudinal direction,
Wherein the first material has a higher tensile strength than the second material and the second material has an elongation and an electrical conductivity higher than that of the first material. The method of claim 3,
Sectional area ratio occupied by the plurality of wire rods among the plurality of cylindrical units and the plurality of wire rods is 50 to 80%. The method of claim 3,
Wherein the first material is a 6000 series aluminum alloy and the second material is 1000 series aluminum. Disposing a plurality of first cylindrical units of a first material different in diameter from each other in a ring shape;
Disposing a plurality of second cylindrical units made of a second material and different in diameter from each other in a ring shape, between the plurality of first cylindrical units spaced apart from each other; And
And extruding the preform in the longitudinal direction, the preform comprising the plurality of first cylindrical units and the plurality of second cylindrical units,
Wherein the first material has a higher tensile strength than the second material and the second material has an elongation and an electrical conductivity higher than that of the first material. The method according to claim 6,
Wherein the cross-sectional area occupied by the plurality of second cylindrical units among the plurality of first cylindrical units and the plurality of second cylindrical units is 50 to 80%. The method according to claim 6,
Wherein the first material is a 6000 series aluminum alloy and the second material is 1000 series aluminum. An extruded wire rod as claimed in any one of claims 3 to 8.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002515630A (en) * 1998-05-11 2002-05-28 ダブリュ．エル．ゴア アンド アソシエーツ，ゲゼルシャフト ミット ベシュレンクテル ハフツング Electrical signal cable
JP2010062029A (en) * 2008-09-04 2010-03-18 Sumitomo Electric Ind Ltd Overhead transmission line
JP2013116320A (en) * 2011-11-04 2013-06-13 Jms Co Ltd Three-layer tube for medical use and extrusion molding method of three-layer tube
JP2014035964A (en) * 2012-08-10 2014-02-24 Yazaki Corp Multilayer coaxial electric wire

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002515630A (en) * 1998-05-11 2002-05-28 ダブリュ．エル．ゴア アンド アソシエーツ，ゲゼルシャフト ミット ベシュレンクテル ハフツング Electrical signal cable
JP2010062029A (en) * 2008-09-04 2010-03-18 Sumitomo Electric Ind Ltd Overhead transmission line
JP2013116320A (en) * 2011-11-04 2013-06-13 Jms Co Ltd Three-layer tube for medical use and extrusion molding method of three-layer tube
JP2014035964A (en) * 2012-08-10 2014-02-24 Yazaki Corp Multilayer coaxial electric wire

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