WO2012011513A1

WO2012011513A1 - Aluminium alloy conductor and manufacturing method for same

Info

Publication number: WO2012011513A1
Application number: PCT/JP2011/066499
Authority: WO
Inventors: 茂樹関谷; 京太須齋; 賢悟水戸瀬
Original assignee: 古河電気工業株式会社
Priority date: 2010-07-20
Filing date: 2011-07-20
Publication date: 2012-01-26
Also published as: JP5228118B2; JP5469262B2; JP2013151750A; JPWO2012011513A1

Abstract

Disclosed is an aluminium alloy conductor having excellent bend-tolerance fatigue properties. The disclosed aluminium alloy conductor includes 0.01-0.4 mass% Fe, 0.3-0.5 mass% Cu, 0.04-0.3 mass% Mg, and 0.02-0.3 mass% Si, and further includes 0.001-0.01 mass% of a combination of Ti and V, and is formed from the remaining portion (A1) and unavoidable impurities. The crystal grain diameter, in a vertical cross section of the wire drawing direction of the conductor, is 5-25 µm.

Description

Aluminum alloy conductor and method of manufacturing the same

The present invention relates to an aluminum alloy conductor used as a conductor of an electrical wiring body and a method of manufacturing the same.

Conventionally, a member obtained by attaching a terminal (connector) made of copper or copper alloy (for example, brass) to an electric wire containing a conductor of copper or copper alloy called a wire harness as an electric wiring body of a mobile body such as an automobile, train or aircraft In recent years, in the weight reduction of mobiles, studies have been advanced to use aluminum or an aluminum alloy lighter than copper or a copper alloy as a conductor of an electric wiring body.
The specific gravity of aluminum is about 1/3 of copper, the conductivity of aluminum is about 2/3 of copper (based on 100% IACS of pure copper, about 66% IACS of pure aluminum), and the conductor wire material of pure aluminum Although it is necessary to make the cross-sectional area of the conductor wire of pure aluminum about 1.5 times that of the conductor wire of pure copper in order to pass the same current as the conductor wire of pure copper, the mass still is about half compared to copper. There are advantages to this.
The above% IACS refers to the conductivity when the resistivity of the international annealed copper standard (International Annealed Copper Standard) is 1.7241 × 10 ⁻⁸ Ωm as 100% IACS.

In order to use the aluminum as a conductor of the electric wiring body of a mobile body, there are several problems, one of which is the improvement of the resistance to bending fatigue. The bending fatigue resistance is required of the aluminum conductor used for the electric wiring body of the moving body because a wire harness attached to a door or the like is repeatedly subjected to bending stress due to opening and closing of the door. When a metal material such as aluminum is repeatedly applied and removed with a load such as opening and closing of a door even at a low load that does not break with a single load, fatigue fracture occurs that breaks with a certain number of repetitions. When the said aluminum conductor is used for an opening-and-closing part, when a bending fatigue-resistant characteristic is bad, it is feared that a conductor will fracture during its use, and the problem that durability and reliability are missing arises.
It is generally said that the higher the strength, the better the fatigue properties. Therefore, although high strength aluminum wire should be applied, the wire harness is required to be easy to handle at the time of its installation (mounting work to the vehicle body), so the elongation is generally 10% or more A dullable material (annealed material) that can be secured is often used.

Therefore, in addition to the strength required for handling and mounting, and the conductivity required for flowing a large amount of electricity, the aluminum conductor used for the electrical wiring body of the moving body has a material excellent in bending fatigue resistance characteristics. Is required.

With respect to such applications, a pure aluminum system represented by aluminum alloy wire rod for power transmission line (JIS A1060 or JIS A1070) can not sufficiently withstand repeated bending stress caused by opening and closing of a door or the like. In addition, although alloyed materials to which various additive elements are added are excellent in strength, causing a decrease in conductivity due to a solid solution phenomenon of the additive elements in aluminum, and forming an excessive intermetallic compound in aluminum. It is a problem that the wire breakage may occur during wire drawing. Therefore, it was necessary to limit and select the additive element to prevent the decrease in conductivity and the deterioration in processability, and to improve the strength and the resistance to bending fatigue.

Patent documents 1 to 3 are typical ones as an aluminum conductor used for an electric wiring body of a moving body. However, as described below, the inventions described in any patent documents have problems to be solved further.
The electric wire conductor described in Patent Document 1 may have too high tensile strength and may be difficult to attach to a vehicle body.
In the case of the aluminum conductive wire specifically described in Patent Document 2, the finish annealing is not performed. In addition, since Cu is not contained, it is desired to have a low elongation and a higher flexibility for the attachment work on the vehicle body.
Patent Document 3 discloses a light-weight, flexible, flexible aluminum conductive wire, but the request for improving the characteristics of the moving body to the electric wiring body is only intensified, and further improvement of the characteristics is desired. There is.

JP 2008-112620 A JP, 2006-19163, A JP, 2006-253109, A

An object of the present invention is to provide an aluminum alloy conductor excellent in bending fatigue resistance and the like.

The present inventors have repeatedly conducted various studies and, as satisfying the required bending fatigue resistance, include the components contained in the aluminum alloy conductor, and the effect of the additive element by controlling the finish annealing production process of the conductor. The inventors have found that the above characteristics can be improved by optimizing the crystal grain size of the conductor using the above, and based on this finding, the present invention has been completed.

That is, the present invention provides the following solutions.
(1) 0.01 to 0.4 mass% of Fe, 0.3 to 0.5 mass% of Cu, 0.04 to 0.3 mass% of Mg, and 0.02 to 0.3 mass% of Si An aluminum alloy conductor containing 0.001 to 0.01 mass% of Ti and V together and containing the balance Al and unavoidable impurities, and having a grain size of 5 to 25 μm in the vertical cross section in the wire drawing direction Aluminum alloy conductor characterized by being.
(2) It is characterized in that the number of repeated breakages is 90,000 or more when a bending strain of tensile strength of 120 MPa or more and conductivity of 57% IACS or more and ± 0.17% is applied (1) Aluminum alloy conductor as described in.
(3) The aluminum alloy conductor according to (1) or (2), wherein the conductor is used as a battery cable, a harness, or a motor wire in a moving body.
(4) The aluminum alloy conductor according to any one of (1) to (3), wherein the conductor is used for a vehicle, a train, or an aircraft.
(5) 0.01 to 0.4 mass% of Fe, 0.3 to 0.5 mass% of Cu, 0.04 to 0.3 mass% of Mg, and 0.02 to 0.3 mass% of Si Of aluminum and further containing 0.001 to 0.01 mass% of Ti and V and dissolving the aluminum alloy component consisting of the balance Al and unavoidable impurities, and then subjected to continuous casting and rolling to form a rough bar, which is cold drawn Heat treatment, wire drawing, wire drawing, and annealing heat treatment, wherein the annealing heat treatment is carried out at a temperature of 300 to 450. C., for 10 minutes to 6 hours.
(6) 0.01 to 0.4 mass% of Fe, 0.3 to 0.5 mass% of Cu, 0.04 to 0.3 mass% of Mg, and 0.02 to 0.3 mass% of Si , At least one element selected from the group consisting of Sn, Cd and In in a total amount of 0.01 to 0.5 mass%, and further containing 0.001 to 0.01 mass% of a total of Ti and V, the balance What is claimed is: 1. An aluminum alloy conductor comprising Al and unavoidable impurities, wherein the crystal grain size in a cross section perpendicular to the wire drawing direction is 5 to 25 μm.
(7) An aluminum alloy conductor according to (6), further containing 0.001 to 0.1 mass% of Zr.
(8) The mass ratio (W1 / W2) of the total content (W1) of the content of at least one element selected from the group consisting of Sn, Cd and In to the content (W2) of Zr is 0.6 to 2 The aluminum alloy conductor according to (7), characterized in that .6.
(9) The apparatus is characterized in that the number of repeated breakages is 80,000 or more when a bending strain of 120 MPa or more and a conductivity of 52% IACS or more and ± 0.17% is applied (6) The aluminum alloy conductor according to any one of (8) to (8).
(10) The aluminum alloy conductor according to any one of (6) to (9), wherein the conductor is used as a battery cable, a harness or a wire for a motor in a movable body.
(11) The aluminum alloy conductor according to any one of (6) to (10), wherein the conductor is used for a vehicle, a train, or an aircraft.
(12) 0.01 to 0.4 mass% of Fe, 0.3 to 0.5 mass% of Cu, 0.04 to 0.3 mass% of Mg, and 0.02 to 0.3 mass% of Si , At least one element selected from the group consisting of Sn, Cd and In in a total amount of 0.01 to 0.5 mass%, and further containing 0.001 to 0.01 mass% of a total of Ti and V, the balance After melting the aluminum alloy component consisting of Al and unavoidable impurities, it is continuously cast and rolled into a rough bar, cold drawn into a rough drawn wire, heat treated, drawn, into a wire, and further annealed. What is claimed is: 1. A method of manufacturing an aluminum alloy conductor comprising the step of performing heat treatment, wherein the annealing heat treatment is performed under conditions of a temperature of 300 to 450 ° C. for 10 minutes to 6 hours. Production method.
(13) 0.01 to 0.4 mass% of Fe, 0.3 to 0.5 mass% of Cu, 0.04 to 0.3 mass% of Mg, and 0.02 to 0.3 mass% of Si , At least one element selected from the group consisting of Sn, Cd and In in a total amount of 0.01 to 0.5 mass%, and further containing 0.001 to 0.01 mass% of a total of Ti and V, Zr The aluminum alloy component containing 0.001 to 0.1 mass% of Al and the balance Al and unavoidable impurities is melted and then subjected to continuous casting and rolling to obtain a rough bar, cold wire drawing to a rough draw wire, and heat treatment A method of manufacturing an aluminum alloy conductor comprising the steps of applying, drawing, forming a wire, and annealing heat treatment, wherein the annealing heat treatment is performed at a temperature of 300 to 450 ° C. for 10 minutes to 6 hours so Method for producing an aluminum alloy conductor, wherein Ukoto.
(14) 0.01 to 0.4 mass% of Fe, 0.3 to 0.5 mass% of Cu, 0.04 to 0.3 mass% of Mg, and 0.02 to 0.3 mass% of Si , At least one element selected from the group consisting of Sn, Cd and In in a total amount of 0.01 to 0.5 mass%, and further containing 0.001 to 0.01 mass% of a total of Ti and V, Zr Of the total content (W1) of the content of at least one element selected from the group consisting of Sn, Cd and In, containing 0.001 to 0.1 mass%, and the mass ratio (W1 /) of the content (W2) of Zr W2) is 0.6 to 2.6, and after melting the aluminum alloy component consisting of the balance Al and unavoidable impurities, it is subjected to continuous casting and rolling to obtain a rough bar, cold drawing and roughing wire, Heat treatment, wire drawing A method for producing an aluminum alloy conductor comprising the steps of annealing the wire as a wire rod, and performing the annealing heat treatment at a temperature of 300 to 450 ° C. for 10 minutes to 6 hours. Method of producing an aluminum alloy conductor.
(15) containing 0.1 to 1 mass% of Cu, and 0.01 to 0.5 mass% in total of at least one element selected from the group consisting of Sn, Cd and In, with the balance being Al and unavoidable impurities Aluminum alloy conductor.
(16) containing 0.1 to 1 mass% of Cu, and 0.01 to 0.5 mass% in total of at least one element selected from the group consisting of Sn, Cd and In; An aluminum alloy conductor containing 0 mass% and 0.1 to 0.35 mass% of Mg, with the balance being Al and unavoidable impurities.
(17) An aluminum alloy conductor according to item (15) or (16), further containing 0.001 to 0.1 mass% of Zr.
(18) The mass ratio of the total content (W1) of the content of at least one element selected from the group consisting of Sn, Cd and In to the content (W2) of Zr is 0.6 to 2.6 The aluminum alloy conductor according to (17), characterized in that
(19) The aluminum alloy conductor according to any one of (15) to (18), wherein the conductor is used as a battery cable, a harness or a wire for a motor in a movable body.
(20) The aluminum alloy conductor according to any one of (15) to (19), wherein the conductor is used for a vehicle, a train, or an aircraft.
(21) After melting the aluminum alloy component giving the aluminum alloy composition according to any one of (15) to (18), continuous casting and rolling are performed to obtain a rough bar, cold wire drawing and roughing wire Heat treatment, wire drawing, wire processing, and annealing heat treatment, which is a method for producing the aluminum alloy conductor according to any one of (15) to (18). The annealing heat treatment is a continuous heat treatment including the steps of rapid heating and quenching, and is performed by applying either of the following <1> or <2>:
<1> wire temperature y (° C.) and annealing time x (seconds),
0.03 ≦ x ≦ 0.55, and ^{^{26x -0.6 + 377 ≦ y ≦ 23.5x}} -0.6 +423
Continuous conduction heat treatment satisfying the relationship of; or <2> annealing furnace temperature z (° C.) and annealing time x (seconds),
1.5 ≦ x ≦ 5 and −50x + 550 ≦ z ≦ −36x + 650
Heat treatment during continuous running that satisfies the relationship of

Hereinafter, the aluminum alloy conductor according to the items (1) to (4) and the method for producing an aluminum alloy conductor according to the item (5) are collectively referred to as a first embodiment of the present invention.
The aluminum alloy conductor according to the items (6) to (11) and the method for producing an aluminum alloy conductor according to the items (12) to (14) are collectively referred to as a first embodiment of the present invention.
The aluminum alloy conductor according to the items (15) to (20) and the method for producing an aluminum alloy conductor according to the item (21) are collectively referred to as a third embodiment of the present invention.
Here, unless otherwise specified, the present invention is meant to encompass all of the first, second and third embodiments.

The aluminum alloy conductor of the present invention is excellent in strength and conductivity, is useful as a battery cable mounted on a moving body, a conductor for a harness or a motor, and is a door, trunk, bonnet, etc. for which excellent bending fatigue resistance is required. It can also be suitably used.
Furthermore, the aluminum alloy conductor of the present invention is excellent in that the bending fatigue property does not deteriorate even when exposed to high temperature (for example, 120 ° C.), and is excellent in corrosion resistance.

The above and other features and advantages of the present invention will become more apparent from the following description with reference to the accompanying drawings as appropriate.

FIG. 1 is an explanatory view of the repeated breakage frequency test of the embodiment.

First, the first embodiment of the present invention will be described.
In a preferred embodiment of the present invention, 0.01 to 0.4 mass% of Fe, 0.3 to 0.5 mass% of Cu, 0.04 to 0.3 mass% of Mg, and 0.02 to Si are included. An aluminum alloy conductor containing 0.3 mass%, further containing 0.001 to 0.01 mass% of Ti and V together, and the balance Al and unavoidable impurities, wherein the crystal grain in the vertical cross section in the wire drawing direction It is an aluminum alloy conductor with a diameter of 5 to 25 μm.

In the present embodiment, the reason for setting the content of Fe to 0.01 to 0.4 mass% is mainly to utilize various effects of the Al—Fe-based intermetallic compound. Fe dissolves only in 0.05 mass% at 655 ° C. in aluminum, and is less at room temperature. The remainder is crystallized or precipitated as Al-Fe second phase particles. The crystallized product or precipitate acts as a grain refining agent, and also improves strength and resistance to bending fatigue. On the other hand, the strength is also increased by the solid solution of Fe. When the content of Fe is too low, these effects are insufficient, and when it is too high, coarsening of the crystallized product causes breakage in wire drawing and twisting. The desired bending fatigue resistance can not be obtained. The content of Fe is preferably 0.10 to 0.3 mass%, more preferably 0.15 to 0.25 mass%.

In the present embodiment, the reason why the content of Cu is 0.3 to 0.5 mass% is that Cu is solid-soluted in the aluminum base material to strengthen it, and to improve the bending fatigue resistance property, and further, This is for forming second phase particles with Al, Fe, Mg and Si to improve the bending fatigue resistance. When the content of Cu is too small, the effect is insufficient, and when too large, the corrosion resistance and the conductivity decrease. Furthermore, the processability becomes worse. The content of Cu is preferably 0.35 to 0.5 mass%, more preferably 0.4 to 0.5 mass%.

In the present embodiment, the content of Mg is set to 0.04 to 0.3 mass% because Mg dissolves in the aluminum base material and strengthens, and a part of it is Al, Fe, Cu, Si, etc. This is because the second phase particles can be formed to improve strength, bending fatigue resistance, and heat resistance. If the content of Mg is too low, the effect is insufficient, and if too high, the conductivity decreases. Moreover, when there is too much content of Mg, a yield strength will become excessive, a moldability, twistability may be degraded, and workability may worsen. The content of Mg is preferably 0.08 to 0.3 mass%, more preferably 0.1 to 0.28 mass%.

In the present embodiment, the reason why the content of Si is set to 0.02 to 0.3 mass% is that Si is solid solution in the aluminum base material to strengthen it, and a part thereof is Al, Fe, Cu, Mg This is because the second phase particles can be formed to improve strength, bending fatigue resistance, and heat resistance. When the content of Si is too small, the effect is insufficient. When the content of Si is too large, the conductivity decreases, the formability and the twistability are deteriorated, and the formability is deteriorated. In addition, precipitation of Si alone in the heat treatment process during wire production causes disconnection. The content of Si is preferably 0.04 to 0.25 mass%, more preferably 0.04 to 0.20 mass%.

In this embodiment, both Ti and V act as a refining material of the ingot during melt casting. If the structure of the ingot is coarse, cracking occurs in the wire processing step, which is not desirable industrially. When the content of Ti and V is too small, the effect is insufficient, and when the content is too large, the conductivity is largely reduced and the effect is also saturated. The total content of Ti and V is preferably 0.002 to 0.008 mass%, more preferably 0.003 to 0.006 mass%.

According to the aluminum alloy conductor of this embodiment of the present invention, the aluminum alloy conductor having desired excellent bending fatigue resistance, strength, and conductivity by defining the crystal grain size strictly in addition to the above components. You can get

(Grain size)
In this embodiment of the present invention, the grain size in the cross section perpendicular to the wire drawing direction of the aluminum alloy conductor is 5 to 25 μm. The reason is that if the thickness is less than 5 μm, the partial unrecrystallized structure remains and the elongation is significantly reduced. The upper limit of 25 μm is that the deformation behavior is uneven when a coarse structure exceeding this is formed. In the same way, the elongation is reduced and the strength is significantly reduced. The crystal grain size is more preferably 5 to 20 μm.

(Tensile strength)
The tensile strength of the aluminum alloy conductor of this embodiment of the present invention is 120 MPa or more. This is because if the tensile strength is less than 120 MPa, the strength including the handling is insufficient and it is difficult to use as an industrial conductor. The tensile strength is preferably 120 to 160 MPa, more preferably 120 to 150 MPa.

(conductivity)
The conductivity of the aluminum alloy conductor of this embodiment of the invention is 57% IACS or higher. This is because if the conductivity is less than 57% IACS, a high current of several tens of ampere (A) flows when used for a power line, and the current loss is severe. The conductivity is preferably 57-62% IACS conductivity, more preferably 58-62% IACS.

(Bending fatigue resistance)
The aluminum alloy conductor of this embodiment of the invention has excellent resistance to flex fatigue. In the present embodiment, the test is performed with a strain amplitude of ± 0.17% as a standard for the bending fatigue resistance. Flexural fatigue resistance changes with strain amplitude. When the strain amplitude is large, the fatigue life becomes short, and when the strain amplitude is small, the fatigue life becomes long. Since the strain amplitude can be determined by the wire diameter of the wire (aluminum alloy conductor) 1 and the curvature radius of the bending

jigs

2 and 3 shown in FIG. 1, the wire diameter of the wire 1 and the curvature radius of the bending

jigs

2 and 3 are arbitrary. It is possible to carry out a bending fatigue test by setting
Next, assuming that the number of times of opening and closing per day is 10 and the use for 20 years is assumed, the number of times of opening and closing is 73,000 times (calculated as 365 days a year). The wires actually used are not single wires, but have a stranded wire structure, and since the coating treatment is performed, the load on the wire conductors is a fraction of that. It was described in Table 1 and Table 2 that the number of times of repeated breakage of 90,000 times or more which can secure sufficient bending fatigue resistance as an evaluation value in a single wire is desirable. More preferably, it is 100,000 times or more.

Next, a second embodiment of the present invention will be described.
Another preferred embodiment of the present invention is 0.01 to 0.4 mass% of Fe, 0.3 to 0.5 mass% of Cu, 0.04 to 0.3 mass% of Mg, and 0.1 to 0.5 of Si. Containing 0.2 to 0.3 mass% and at least one element selected from the group consisting of Sn, Cd and In in a total amount of 0.01 to 0.5 mass%, and further combining Ti and V into 0.001 to It is an aluminum alloy conductor containing 0.01 mass%, the balance Al and unavoidable impurities, and having a crystal grain size of 5 to 25 μm in a cross section perpendicular to the wire drawing direction.

The functions and effects of Fe, Cu, Mg, Si, Ti and V, the reason for limitation of the range of addition amount, and the range of preferable addition amount are as described above.

In order to improve the bending fatigue resistance further than the above-described alloy, it is preferable to suppress the formation of second phase particles containing two or more of Al, Fe, Cu, Mg, and Si as components.
By the way, Sn, Cd and In have the action of capturing the pores in the aluminum alloy, that is, they have the function of suppressing or delaying the diffusion action which proceeds with the pores, whereby Al, It suppresses the formation of second phase particles composed of two or more of Fe, Cu, Mg and Si. As a result, the bending fatigue resistance can be further improved by the addition of at least one element selected from the group consisting of Sn, Cd and In.
If the total content of at least one element selected from the group consisting of Sn, Cd and In is 0.01 to 0.5 mass%, the effect of suppressing the formation of second phase particles is less than 0.01 mass%. When the content is more than 0.5 mass%, the effect of suppressing formation is lost and the formation of second phase particles is accelerated, and the elongation decreases, and when the total amount is too large, cracking occurs during wire drawing. It is likely to occur and industrial production can not be realized.

However, the effect of suppressing the formation of second phase particles by the addition of at least one element selected from the group consisting of Sn, Cd and In is remarkable at a low temperature of 100 ° C. or less, but at a high temperature exceeding 100 ° C. The higher the temperature, the less effective the suppression may be and precipitate particles may be produced. Therefore, by further adding Zr, it is possible to cancel the phenomenon that the precipitation suppressing effect disappears. By adding Zr together with at least one element selected from the group consisting of Sn, Cd and In, at least one of Al, Fe, Cu, Mg and Si is a component even at high temperatures exceeding 100 ° C. It has the effect of suppressing the formation of two-phase particles. If the addition amount of Zr is 0.001 to 0.1 mass%, the effect is insufficient if it is less than 0.001 mass%, and if it exceeds 0.1 mass%, the second phase particles of Al-Zr system The generation amount of is large to lower the bending fatigue resistance.

A more preferable range of the mass ratio (W1 / W2) of the total content (W1) of the content of at least one element selected from the group consisting of Sn, Cd and In to the content (W2) of Zr is 0.6 It is -2.6. Within this range, even at a high temperature exceeding 100 ° C., the generation of second phase particles containing two or more of Al, Fe, Cu, Mg and Si as a component is more effectively suppressed.

(conductivity)
The conductivity of the aluminum alloy conductor of this embodiment of the invention is greater than 52% IACS. Essentially, if the conductivity is less than 57% IACS, a high current of several tens of ampere (A) flows when used for a power line, and current loss may be severe, so preferably 57-62% IACS conductivity is there. However, for example, in the case of application to a communication cable such as a battery cable or a wire harness in a moving body, the range is not limited to 57% IACS or more, and 52% IACS or more may be used.

jigs

2 and 3 are arbitrary. It is possible to carry out a bending fatigue test by setting
Next, assuming that the number of times of opening and closing per day is 10 and the use for 20 years is assumed, the number of times of opening and closing is 73,000 times (calculated as 365 days a year). The wires actually used are not single wires, but have a stranded wire structure, and since the coating treatment is performed, the load on the wire conductors is a fraction of that. It was described in Table 3 that the number of repeated breakages of 80,000 times or more which can secure sufficient bending fatigue resistance as an evaluation value on a single wire is desirable. More preferably, it is 100,000 times or more, and more preferably 150,000 times or more. Also, in automotive applications, the wires may be exposed to high temperatures in harsh operating environments. In general, assuming 10 years of use, an accelerated test of 120 hours of exposure at a high temperature of 120 ° C. is applied. Therefore, even after standing at 120 ° C. for 120 hours, the number of repeated breakages is preferably 80,000 or more, and more preferably 90,000 or more.

(Production method)
The manufacturing method of the aluminum alloy conductor of the 1st and 2nd embodiment of this invention is demonstrated.
The aluminum alloy conductor according to the first and second embodiments of the present invention is [1] melting, [2] casting, [3] hot or cold working (such as groove rolling), [4] wire drawing, It can manufacture through each process of [5] heat treatment (intermediate annealing), [6] wire-drawing, and [7] heat treatment (finish annealing).

In order to obtain the aluminum alloy composition of the present invention, first, at least one element selected from the group consisting of each alloy component of Fe, Cu, Mg, Si, Ti, V and Al, or in addition thereto Sn, Cd and In. The respective alloy components in combination or any of these alloy components and each alloy component in which Zr is further combined are melted in an amount such that the desired concentration is obtained.

Next, rolling is performed while continuously casting the molten metal in a water-cooled mold using a properchi-type continuous casting-rolling machine combining a casting wheel and a belt to make a rough bar of about 10 mmφ. The process from casting to processing of a wire rod of about 10 mm in diameter can be performed continuously, and steps such as a reheating step can be omitted, so that productivity can be significantly improved. The casting cooling rate at this time is preferably 1 to 20 ° C./second.

Next, the surface is peeled off to make a diameter of 9 to 9.5 mm, and this is drawn to make a rough drawn wire. Here, the wire cross-sectional area before drawing A _0, when the wire cross-sectional area after drawing and A _1, eta = working ratio expressed by ln _(A 0 / A ₁₎ is 1 to 6 It is preferable that it is the following. If the degree of processing is too small, the recrystallized grains become coarse during the heat treatment of the next step, and the strength and the elongation are significantly reduced, which may cause a break. If the size is too large, wire drawing becomes difficult, and there are problems in terms of quality such as breakage during wire drawing. Peeling of the surface may, but does not have to, clean the surface.

Intermediate annealing is applied to the cold drawn rough drawn wire by a batch type annealing furnace. The condition of the intermediate annealing is a temperature of 300 to 450.degree. If the temperature is less than 300 ° C., non-recrystallized grains remain, which causes breakage during wire drawing in a later step. When the temperature exceeds 450 ° C., coarse recrystallized grains are formed, and the tensile strength and the elongation are significantly reduced. Also in this case, there are problems in quality such as breakage during wire drawing. The time is 10 minutes to 6 hours. If it is less than 10 minutes, non-recrystallized grains remain and cause breakage during wire drawing in a later step. If the heat treatment temperature exceeds 6 hours, coarse recrystallized grains may be formed depending on the heat treatment temperature, the tensile strength and the elongation may be significantly reduced, and the wire may be broken during wire drawing. It is not good to exceed 6 hours from the viewpoint of productivity. The conditions for the intermediate annealing are preferably 300 to 450 ° C. and 30 minutes to 4 hours.

Wire drawing is further applied to make a wire. Also in this case, the processing degree is 1 or more and 6 or less for the above-mentioned reason.

The cold drawn wire of a predetermined diameter is subjected to finish annealing in a batch annealing furnace to obtain an aluminum alloy conductor. The conditions for the finish annealing are a temperature of 300 to 450.degree. If the temperature is less than 300 ° C., non-recrystallized grains remain, and sufficient flexibility can not be secured. Moreover, when it exceeds 450 ° C., coarse recrystallized grains are formed, and the tensile strength and the elongation are significantly reduced. The time is 10 minutes to 6 hours. If it is less than 10 minutes, non-recrystallized grains remain, and sufficient flexibility can not be secured. Also, if it exceeds 6 hours, coarse recrystallized grains are formed depending on the heat treatment temperature, and the tensile strength and elongation are significantly reduced. It is not good to exceed 6 hours from the viewpoint of productivity. The conditions for the finish annealing are preferably 300 to 450 ° C. for 30 minutes to 4 hours.
In addition, as for the final annealing, in addition to the batch type annealing, for example, an electric current annealing in which electricity is supplied to a conductor and annealing is performed by Joule heat, or a wire annealing in which a wire is continuously passed and annealed in an annealing furnace kept at high temperature. Alternatively, induction heating may be employed in which the wire passes continuously through the magnetic field for annealing. In this case, since the heat treatment is generally performed at a high temperature for a short time, the conditions for the finish annealing are different from the batch annealing.

The aluminum alloy conductors of these embodiments of the present invention prepared by heat treatment appropriately as described in detail above have a recrystallized structure in addition to having the predetermined crystal grain size. The recrystallized structure is a structural state composed of crystal grains with few lattice defects such as dislocations introduced by plastic working. By having a recrystallized structure, tensile elongation at break, conductivity can be recovered, and sufficient flexibility can be obtained.

Next, a third embodiment of the present invention will be described.
Yet another preferred embodiment of the present invention contains 0.1 to 1 mass% of Cu, and 0.01 to 0.5 mass% in total of at least one element selected from the group consisting of Sn, Cd and In. And an aluminum alloy conductor consisting of the balance Al and unavoidable impurities. Here, as an unavoidable impurity in the alloy composition of the aluminum alloy conductor of this embodiment, it is disclosed in JISH2110 (Aluminum alloy base metal for electricity), and it is not more than 0.25 mass% of Fe, not more than 0.1 mass% of Si, and 0.005 mass% of Cu. Hereinafter, Mn of 0.005 mass% or less and Ti + V 0.005 mass% or less can be mentioned.
In addition, unavoidable impurities in the industrially manufactured bare metal are generally in the range of Fe 0.05 to 0.15 mass% and Si 0.04 to 0.1 mass%. In addition, although the thing whose content of Fe or Si is less than 0.01 mass% is generally handled as high purity aluminum, since high purity aluminum itself has a low content of Fe or Si, it is the same as the above-mentioned each embodiment. Also in this embodiment, it is not included in the preferable range.
The alloy composition of the aluminum alloy conductor of this embodiment may contain 0.1 to 0.35 mass% of Mg. In addition, Fe may be contained in an amount of 1.0 mass% or less exceeding the content of the unavoidable impurities.

In order to improve the bending fatigue resistance further than the above-described alloy, Cu should be in a solid solution state in aluminum without forming second phase particles. However, Cu tends to easily form second phase particles with Al, and the formation amount of the second phase particles increases with the increase of the added Cu amount, and the formed second phase particles deteriorate in bending fatigue characteristics. Bring
The reason why Cu is set to 0.1 to 1 mass% is that if it is less than 0.1 mass%, the amount of solid solution is small and the resistance to bending fatigue is not good, and if it is 1 mass% or more, the specific manufacturing method shown below Also in the second phase, the formation of second phase particles of Cu and Al can not be prevented, and the corrosivity due to the particles becomes remarkable to make the corrosion resistance inferior, and the particles cause the deterioration of the bending fatigue resistance characteristics. There is
By the way, Sn, Cd and In have the action of capturing the pores in the aluminum alloy, that is, have the function of suppressing or delaying the diffusion action which proceeds with the pores, thereby making it possible to Suppress the formation of second phase particles containing Cu as a component. As a result, the bending fatigue resistance can be further improved by the addition of at least one element selected from the group consisting of Sn, Cd and In.
If the total content of at least one element selected from the group consisting of Sn, Cd and In is 0.01 to 0.5 mass%, the effect of suppressing the formation of second phase particles is less than 0.01 mass%. If the content is more than 0.5 mass%, the effect of suppressing formation is saturated and the elongation is reduced, and if the total amount is too large, cracking tends to occur at the time of wire drawing, and industrial production can not be realized It is.

However, the effect of suppressing the formation of second phase particles by the addition of at least one element selected from the group consisting of Sn, Cd and In is remarkable at a low temperature of 100 ° C. or less, but at a high temperature exceeding 100 ° C. The higher the temperature, the less effective the suppression may be and precipitate particles may be produced. Therefore, by further adding Zr, it is possible to cancel the phenomenon that the precipitation suppressing effect disappears. Zr, together with at least one element selected from the group consisting of Sn, Cd and In, has the effect of suppressing the formation of second phase particles containing Al and Cu even at high temperatures exceeding 100 ° C. Have. If the addition amount of Zr is 0.001 to 0.1 mass%, the effect is insufficient if it is less than 0.001 mass%, and if it exceeds 0.1 mass%, the second phase particles of Al-Zr system The generation amount of is large to lower the bending fatigue resistance.

A more preferable range of the mass ratio (W1 / W2) of the total content (W1) of the content of at least one element selected from the group consisting of Sn, Cd and In to the content (W2) of Zr is 0.6 It is -2.6. Within this range, even at a high temperature exceeding 100 ° C., it has the effect of further suppressing the formation of second phase particles containing Al and Cu as components.

According to the aluminum alloy conductor of this embodiment of the present invention, the aluminum alloy conductor having the desired excellent bending fatigue resistance characteristics, strength and conductivity by strictly controlling the manufacturing method other than the above components You can get it.

jigs

2 and 3 are arbitrary. It is possible to carry out a bending fatigue test by setting
Next, assuming that the number of times of opening and closing per day is 10 and the use for 20 years is assumed, the number of times of opening and closing is 73,000 times (calculated as 365 days a year). The wires actually used are not single wires, but have a stranded wire structure, and since the coating treatment is performed, the load on the wire conductors is a fraction of that. It was described in Table 6 that the number of repeated breakages of 80,000 times or more which can secure sufficient bending fatigue resistance as an evaluation value for a single wire is desirable. More preferably, it is 100,000 times or more, and more preferably 150,000 times or more. Also, in automotive applications, the wires may be exposed to high temperatures in harsh operating environments. In general, assuming 10 years of use, an accelerated test of 120 hours of exposure at a high temperature of 120 ° C. is applied. Therefore, even after standing at 120 ° C. for 120 hours, the number of repeated breakages is preferably 80,000 or more, and more preferably 90,000 or more.

(Production method)
Next, a method of manufacturing the aluminum alloy conductor of the third embodiment of the present invention will be described.
The aluminum alloy conductor according to the third embodiment of the present invention may be manufactured by [1] melting, [2] casting, [3] hot or cold working as a manufacturing method different from the first and second embodiments. It can manufacture through each process of (4 groove drawing, etc.), [4] wire drawing, [5] heat treatment (intermediate annealing), [6] wire drawing, and [7] heat treatment (finish annealing).

The melting is performed by melting the alloy components of the aluminum alloy composition described above in such amounts as to achieve the concentrations of the respective embodiments.

Next, rolling is performed while continuously casting the molten metal in a water-cooled mold using a properchi-type continuous casting-rolling machine combining a casting wheel and a belt to make a rough bar of about 10 mmφ. The casting cooling rate at this time is preferably 1 to 20 ° C./second. Casting and hot rolling may be performed by billet casting, extrusion and the like.

Next, the surface is peeled off to make a diameter of 9 to 9.5 mm, and this is drawn to make a rough drawn wire. The processing degree is preferably 1 or more and 6 or less. Here, when the wire cross-sectional area before wire drawing is A ₀ and the wire cross-sectional area after wire drawing is A ₁ , the working degree η is represented by η = ln (A ₀ / A ₁ ). If the degree of processing at this time is too small, the recrystallized grains may become coarse during the heat treatment of the next step, and the strength and the elongation may be significantly reduced, which may cause a break. If the size is too large, wire drawing becomes difficult, and problems may occur in quality such as breakage during wire drawing. Peeling of the surface may, but does not have to, clean the surface.

Intermediate annealing is applied to the cold drawn wire rod. Intermediate annealing is mainly performed to restore the flexibility of the wire rod that has been hardened by wire drawing. If the intermediate annealing temperature is too high or too low, wire breakage will occur in the subsequent wire drawing process, and the wire can not be obtained. The intermediate annealing temperature is preferably 300 to 450 ° C., more preferably 350 to 450 ° C. The time of intermediate annealing is 10 minutes or more. If it is less than 10 minutes, the time required for recrystallized grain formation and growth is insufficient, and the flexibility of the wire can not be recovered. Preferably, it is 1 to 6 hours. Although the average cooling rate from the heat treatment temperature to 100 ° C. during the intermediate annealing is not particularly specified, it is preferably 0.1 to 10 ° C./min.

Wire drawing is further applied to make a wire. In order to obtain the above recrystallization texture, the degree of processing (the degree of processing before the continuous heat treatment) at this time is made 1 or more and 6 or less. The degree of processing greatly affects recrystallized grain formation and growth. If the degree of processing is too small, during the heat treatment of the next step, the recrystallized grains may be coarsened, the strength and the elongation may be significantly reduced, which may cause a break. In addition, the driving force for moving the recrystallized grain boundaries may be insufficient to form a target recrystallized texture. If the size is too large, wire drawing becomes difficult, and problems may occur in quality such as breakage during wire drawing. The processing degree is preferably 2 or more and 6 or less.

Also, the drawing speed is controlled to obtain a desired recrystallization texture. The wire drawing speed is preferably 500 to 2000 m / min. If the drawing speed is less than 500 m / min, it may not be possible to obtain the desired recrystallized texture during the final annealing in the next step. If the drawing speed is more than 2000 m / min, the frictional force applied to the wire is large, and it may not be possible to obtain the intended recrystallization texture during the final annealing in the next step, and the wire breaks during drawing May cause problems in terms of quality. The wire drawing speed is more preferably 800 to 1800 m / min.

The cold drawn wire of a predetermined diameter is subjected to finish annealing by batch heat treatment or continuous heat treatment to obtain an aluminum alloy conductor.
The conditions of the batch type heat treatment as the finish annealing are the same as described above.
Among them, the continuous heat treatment can be performed by any of the two methods of the continuous current heat treatment and the continuous running heat treatment.

In the continuous electric heat treatment, annealing is performed by Joule heat generated from itself by applying an electric current to a wire which passes continuously through two electrode wheels. The wire can be annealed by controlling the temperature of the wire and the annealing time including the rapid heating and quenching steps. Cooling is performed by passing the wire continuously through water or nitrogen gas atmosphere after rapid heating. Whether the wire temperature is too low or the annealing time is too short, or if both do not provide the flexibility needed for in-vehicle installation etc, while the wire temperature is too high or the annealing time is too long In one or both of the cases, the crystal orientation is excessively rotated by over-annealing, and a desired recrystallization texture can not be obtained, and furthermore, the resistance to bending fatigue also deteriorates. Therefore, if it carries out on the conditions with which the following relationships are satisfied, it can be set as the above-mentioned desired recrystallization texture.
Assuming that the wire temperature is y (° C.) and the annealing time is x (seconds) in the continuous current heat treatment,
0.03 ≦ x ≦ 0.55, and ^{^{26x -0.6 + 377 ≦ y ≦ 23.5x}} -0.6 +423
Do as you meet.
The wire temperature y (° C.) represents the temperature immediately before passing through the cooling step, at which the temperature as the wire becomes the highest. y (° C.) is usually in the range of 414 to 616 (° C.).

The heat treatment during continuous running is to allow the wire to continuously pass through the annealing furnace maintained at high temperature for annealing. The wire can be annealed by controlling the temperature of the annealing furnace and the annealing time including the rapid heating and quenching steps. Cooling is performed by passing the wire continuously through water or nitrogen gas atmosphere after rapid heating. If the annealing furnace temperature is too low or the annealing time is too short or both cases, the flexibility required for in-vehicle installation etc. is not obtained, while the annealing furnace temperature is too high or the annealing time is long In one or both cases, the crystal orientation is excessively rotated by over-annealing, and a desired recrystallization texture can not be obtained, and furthermore, the resistance to bending fatigue is deteriorated. Therefore, if it carries out on the conditions with which the following relationships are satisfied, it can be set as the above-mentioned desired recrystallization texture.
Assuming that the annealing furnace temperature is z (° C.) and the annealing time is x (seconds) in the continuous running heat treatment,
1.5 ≦ x ≦ 5 and −50x + 550 ≦ z ≦ −36x + 650
Do as you meet.
In addition, annealing furnace temperature z (degreeC) represents the temperature just before passing through a cooling process where temperature becomes the highest as a wire material. z (° C.) is usually in the range of 300 to 596 (° C.).
In addition to the above two methods, the finish annealing by the continuous heat treatment may be induction heating in which the wire is continuously passed and annealed in a magnetic field.

The aluminum alloy conductor of this embodiment of the present invention produced by heat treatment properly as described in detail above has a recrystallized structure in addition to having the above-mentioned predetermined alloy composition. The recrystallized structure is a structural state composed of crystal grains with few lattice defects such as dislocations introduced by plastic working. By having a recrystallized structure, tensile elongation at break, conductivity can be recovered, and sufficient flexibility can be obtained.

The invention will be described in more detail on the basis of the following examples. The present invention is not limited to the examples shown below.

Example No. Comparative Examples 1 to 24 1 to 12
(First Embodiment of the Present Invention, That is, Embodiments and Comparative Examples of the Invention According to the Items (1) to (5))
As shown in Table 1 (Examples) and Table 2 (Comparative Examples) described later, Fe, Cu, Mg, Si, Ti, V, and Al were used at a predetermined amount ratio (mass%) to form an alloy. Here, with regard to Al, the JIS-H4040 alloy No. 1070 was used, and the content of unavoidable impurities did not exceed the values in Tables 1 and 2. Comparative example No. 1 (pure Al), comparative example No. 1 2, Comparative Example No. 2 As for No. 8, high purity aluminum (four nines (4N)) was used as Al.
This alloy was rolled while continuously casting the molten metal in a water-cooled mold using a properch-type continuous cast-rolling machine to give a rough bar of about 10 mmφ. The casting cooling rate at this time was 1 to 20 ° C./second.
Next, the surface was peeled off to 9 to 9.5 mmφ, which was then drawn to a rough drawn wire of 2.6 mmφ. Next, as shown in Tables 1 and 2, this cold drawn material is subjected to intermediate annealing at a temperature of 300 to 450 ° C. for 0.5 to 4 hours, and further subjected to wire drawing to obtain a wire diameter of 0. It was a wire of .31 mmφ.
Finally, as a final annealing, a batch type heat treatment at a temperature of 300 to 450 ° C. (comparative example includes 250 ° C. and 500 ° C.) for 0.5 to 4 hours is applied as a final annealing to obtain an aluminum alloy conductor.

Comparative example No. 13
As shown in Table 2 below, Fe, Cu, Mg, and Al were melted by a conventional method using a predetermined amount ratio (% by mass) and cast into a 25.4 mm square mold to obtain an ingot . Next, the ingot was held at 400 ° C. for 1 hour, hot-rolled with a grooved roll, and processed into a rough drawn wire having a wire diameter of 9.5 mm.
Next, this rough drawn wire is drawn to a wire diameter of 0.9 mm, then heat treated by holding at 350 ° C. for 2 hours for quenching, and then wire drawing is continued to continue an aluminum alloy wire with a wire diameter of 0.32 mm. Was produced.
Finally, the manufactured aluminum alloy wire having a wire diameter of 0.32 mm was heat-treated at 350 ° C. for 2 hours and gradually cooled.

Comparative example No. 14
As shown in Table 2 below, Fe, Mg, Si and Al are melted by a conventional method using a predetermined amount ratio (% by mass) and processed into a rough drawn wire having a wire diameter of 9.5 mm by a continuous casting and rolling method did.
Next, after drawing this rough drawn wire to a wire diameter of 2.6 mm, heat treatment is performed by holding for 2 hours at 350 ° C. so that the tensile strength after heat treatment is 150 MPa or less, and wire drawing is continued to continue the wire An aluminum alloy wire of 0.32 mm in diameter was produced.

Comparative example No. 15
As shown in Table 2 below, an alloy melt prepared by melting using Fe, Mg, Si and Al at a predetermined ratio (mass%) was cast by a continuous casting machine to produce a cast bar. Then, a wire rod of φ 9.5 mm was produced by a hot rolling machine, and the obtained wire rod was subjected to cold drawing to produce an electric wire of φ 0.26 mm. Subsequently, seven wire strands were twisted together to make a stranded wire. Thereafter, solution treatment, cooling, and aging heat treatment were performed to obtain a wire conductor. The solution treatment temperature at this time is 550 ° C., the tempering temperature of the aging heat treatment is 170 ° C., and the tempering time is 12 hours. In addition, each characteristic shown in Table 2 evaluated the twisted wire by breaking it into one strand.

Each characteristic was measured by the following method about the produced aluminum alloy conductor of each Example and comparative example. The results are shown in Tables 1 and 2 below.

(A) Grain size (GS)
The cross section of the test material cut out perpendicularly to the wire drawing direction was filled with a resin, and after mechanical polishing, electrolytic polishing was performed. Electropolishing conditions are as follows: polishing solution is an ethanol solution of 20% perchloric acid, solution temperature is 0-5 ° C., voltage is 10 V, current is 10 mA, and time is 30-60 seconds. Then, in order to obtain grain contrast, anodizing was performed using 2% hydrofluoric acid under the conditions of a voltage of 20 V, a current of 20 mA, and a time of 2 to 3 minutes. The tissue was photographed with a 200 to 400 × optical microscope and particle size measurement was performed by the cross method. Specifically, a straight line was drawn on the photographed photograph, and the number of intersections of the length of the straight line and the grain boundary was measured to determine the average grain size. The particle diameter was calculated by changing the length and number of the straight line so that 50 to 100 particles could be counted.
(B) Tensile strength (TS) and flexibility (tensile elongation at break, El)
Three samples were tested in accordance with JIS Z 2241 and the average value was determined. The flexibility was evaluated using a tensile elongation at break, and a tensile elongation at break of 10% or more was accepted.
(C) Conductivity (EC)
Three pieces of specific resistance were measured using a four-terminal method in a constant temperature bath maintained at 20 ° C. (± 0.5 ° C.) for a test piece of 300 mm in length, and the average conductivity was calculated. The distance between the terminals was 200 mm.
(D) Number of times of repeated breakage Using a double-acting bending fatigue tester manufactured by Fujii Seiki Co., Ltd. (now Fujii Co., Ltd.), using a jig which gives ± 0.17% bending strain to the wire (aluminum alloy conductor) Then, by repeatedly performing bending, the number of times of repeated breakage was measured. The number of times of repeated breakage was measured four each, and the average value was determined. As shown in the explanatory view of FIG. 1, the wire 1 was inserted with 1 mm between the bending

jigs

2 and 3 at an interval of 1 mm, and was repeatedly made to move along the

jigs

2 and 3. One end of the wire was fixed to the holding jig 5 so that bending could be repeatedly performed, and a weight 4 of about 10 g was hung at the other end. Since the holding jig 5 moves during the test, the wire 1 fixed to the holding jig also moves and can be repeatedly bent. The repetition is performed under the condition of 1.5 Hz (1.5 times of reciprocation in 1 second), and when the test piece 1 of the wire is broken, the weight 4 is dropped and the counting is stopped.

As apparent from Tables 1 and 2, Comparative Example No. 1 made of pure Al. In the conductor No. 1, the crystal grain size is large, the tensile strength is low, and furthermore, the value of the number of repeated breakages is small because the bending fatigue resistance is inferior. Comparative example No. In the aluminum alloy conductors of 2 to 10, the alloy composition is an example out of the specified range of the present invention. In the case of 2 to 4, 6 and 8 to 10 aluminum alloy conductors, the number of repeated breakages is insufficient. Comparative example No. In the case of the 5, 7, 9, 10 aluminum alloy conductors, the conductivity is insufficient. Furthermore, in the aluminum alloy conductors of Comparative Examples 2, 4 and 6, the tensile strength is insufficient. Comparative example No. The aluminum alloy conductors of Examples 11 and 12 are examples in which the manufacturing conditions are out of the specified range of the present invention. In the case of the 12 aluminum alloy conductors, the tensile strength and the number of repeated breakages are also insufficient. Comparative example No. The aluminum alloy conductor No. 13 reproduces Example 2 of JP-A-2006-253109, but the number of repeated breakages is insufficient. Comparative example No. The aluminum alloy conductor No. 14 reproduces Example 6 of JP-A-2006-19163, but the crystal grain size of the present invention can not be obtained, and the tensile elongation at break is insufficient. Comparative example No. The aluminum alloy conductor No. 15 reproduces Example 3 of JP-A-2008-112620, but the crystal grain size of the present invention can not be obtained, and the tensile elongation at break and the electrical conductivity are insufficient.
On the other hand, Example No. The aluminum alloy conductors of 1 to 24 are excellent in bending fatigue resistance, tensile properties and conductivity, and are suitable for applications such as wire harnesses used for doors, trunks and bonnets of moving vehicle bodies.

Example No. 101 to 120, Comparative Example No. 1 121-127
(The second embodiment of the present invention, that is, the embodiment and the comparative example of the invention described in the items (6) to (14))
As shown in Tables 3 and 4 below, the above-described example using Fe, Cu, Mg, Si, Ti, V, Sn, Cd, In, Zr, and Al in a predetermined amount ratio (mass%) In the same manner as in, an aluminum alloy conductor was produced.
Each characteristic was measured about the produced aluminum alloy conductor of each Example and comparative example similarly to the above-mentioned Example. Moreover, about the number of times of repeated breakage, it measured also about the characteristic after leaving to stand at 120 degreeC for 120 hours. The results are shown in Tables 3 and 4. In addition, for the aluminum alloy conductor No. 1 described in Table 1 in the above-mentioned example, With respect to 1 to 20, the number of repeated breakages after leaving at 120 ° C. for 120 hours was measured. The results are shown in Table 5.

From Table 3, No. The number of repeated breakages in the aluminum alloy conductor containing 101 to 120 Sn, Cd, In, and Zr was slightly lower than that of the aluminum alloy conductor not containing Sn, Cd, In, and Zr described in Table 1. . However, no. In the aluminum alloy conductors 101 to 114, the number of repeated breakages after being left at 120 ° C. was not significantly reduced as compared with the case where the heating and leaving was not performed, and the high bending resistance was maintained. In addition, although Table 5 is the frequency | count of repeating breakage after 120 degreeC leaving-to-stand of the wire of Table 1, it turns out that the fall by this heating and leaving is remarkable.
Also, no. In the case of the aluminum alloy conductor 115 to 120, the number of breakages was repeatedly improved by leaving it at 120 ° C.
From the above, No. It has been found that an aluminum alloy conductor containing Sn, Cd, In and Zr of 101 to 120 does not significantly deteriorate the number of repeated breakages even after leaving at 120 ° C., or conversely improves it.
On the other hand, when the amount of addition of Sn, Cd and In was too small. The number of repeated breakages after leaving at 120 ° C for the aluminum alloy conductors of 121 to 123 and the aluminum alloy conductors without Sn, Cd, In and Zr in Table 5 are all significantly reduced compared to before leaving at 120 ° C for heating It was the result. In addition, when Sn, Cd, In, and Zr are added in excess (Table 4, No. 124 to 126), the number of repeated breakages after leaving at 120 ° C. is significantly reduced compared to the case where they are not left standing. Also, the decrease in elongation and the decrease in conductivity were large. Moreover, when excess Zr was added (Table 4, No. 127), the number of times of repeated breakage was low without being left at 120 ° C.

Example No. 201-212, comparative example No. 213-218
(Third Embodiment of the Invention, That is, Embodiments and Comparative Examples of the Invention According to the Items (15) to (21))
As shown in Table 6 below, an aluminum alloy conductor was produced in the same manner as in the above-mentioned Example, using each component at a predetermined amount ratio (% by mass). In this example, the wire drawing speed is 1500 m / min, the working degree を is 2.1, and the final wire diameter is 0.31 mm. Further, as shown in Table 6, heat treatment as finish annealing was performed by continuous current heat treatment or batch heat treatment under the conditions described in Table 6.
Each characteristic was measured about the produced aluminum alloy conductor of each Example and comparative example similarly to the above-mentioned Example. Moreover, about the number of times of repeated breakage, it measured also about the characteristic after leaving to stand at 120 degreeC for 120 hours. The results are shown in Table 6.
Furthermore, in addition to these tests, a salt spray test was performed on a wire (aluminum alloy conductor). The produced aluminum alloy conductor was cut into a length of about 1 m and exposed to a neutral 5% salt spray test (JISH 8502) for 96 hours. When the cross section of the sample after the test is resin-polished and observed with an optical microscope, pitting corrosion of 1/5 or more of the wire diameter or depth from the surface of the aluminum alloy conductor on the aluminum alloy conductor surface side When the appearance of intergranular corrosion was detected to a depth of 1/5 or more of the wire diameter in the direction, it was determined to be x. On the other hand, even if there was pitting or intergranular corrosion, its length was 1/5 The less than thing was determined to be ○, the one hardly to be seen to be ◎.

From Table 6, No. The aluminum alloy conductor containing 201 to 212 Sn, Cd, In, and Zr each has a number of repeated breakage exceeding 100,000, which proves to be an excellent bending characteristic, and after leaving at 120 ° C. The reduction in the number of breakages was slight even in the case of the above, and the number of repeated breakages exceeded 95,000.
On the contrary, No. 1 with too little Cu added. In the aluminum alloy conductors 213 and 214, the number of repeated breakages was significantly lower than 90,000 times, and the decrease was remarkable after leaving at 120 ° C. Moreover, Cu excess No. The aluminum alloy conductors 215 and 216 had remarkable reduction in the number of repeated breakages after being left at 120 ° C., and deteriorated in the salt spray test. Moreover, comparative example No. The aluminum alloy conductors 217 and 218 are examples in which the manufacturing conditions are out of the specified range of the present invention, but both are insufficient in tensile elongation at break, and Comparative Example No. In the case of the aluminum alloy conductor 218, the tensile strength and the number of repeated breakages are also insufficient.

While the present invention has been described in conjunction with its embodiments, we do not intend to limit our invention in any detail of the description unless otherwise specified, which is contrary to the spirit and scope of the invention as set forth in the appended claims. I think that it should be interpreted broadly without.

The present application claims priority based on Japanese Patent Application No. 2010-163416 filed in Japan on July 20, 2010, the contents of which are incorporated herein by reference. Capture as part.

1 Test piece (wire, aluminum alloy conductor)
2, 3 Bending jig 4 Weight 5 Holding jig

Claims

0.01 to 0.4 mass% of Fe, 0.3 to 0.5 mass% of Cu, 0.04 to 0.3 mass% of Mg, and 0.02 to 0.3 mass% of Si Further, it is an aluminum alloy conductor containing 0.001 to 0.01 mass% of total of Ti and V, and the balance Al and unavoidable impurities, and having a grain size of 5 to 25 μm in a vertical cross section in the drawing direction Aluminum alloy conductor characterized by
The tensile strength is 120 MPa or more, and the conductivity is 57% IACS or more, when the bending strain of ± 0.17% is given, the number of repeated breakages is 90,000 times or more. Aluminum alloy conductor.
The aluminum alloy conductor according to claim 1 or 2, wherein the conductor is used as a battery cable, a harness or a wire for a motor in a movable body.
The aluminum alloy conductor according to any one of claims 1 to 3, wherein the conductor is used for a vehicle, a train, or an aircraft.
0.01 to 0.4 mass% of Fe, 0.3 to 0.5 mass% of Cu, 0.04 to 0.3 mass% of Mg, and 0.02 to 0.3 mass% of Si Further, after dissolving the aluminum alloy component containing 0.001 to 0.01 mass% of the total of Ti and V and containing the balance Al and the inevitable impurities, it is subjected to continuous casting and rolling to form a rough bar, cold wire drawing and rough A method of manufacturing an aluminum alloy conductor comprising the steps of: drawing wire; heat treatment; drawing to form a wire; and annealing heat treatment, wherein the annealing heat treatment is carried out at a temperature of 300 to 450 ° C. A method for producing an aluminum alloy conductor, characterized in that the method is carried out under conditions of minutes to 6 hours.
0.01 to 0.4 mass% of Fe, 0.3 to 0.5 mass% of Cu, 0.04 to 0.3 mass% of Mg, 0.02 to 0.3 mass% of Si, Sn, It contains 0.01 to 0.5 mass% in total of at least one element selected from the group consisting of Cd and In, further contains 0.001 to 0.01 mass% of total of Ti and V, and the balance Al and unavoidable What is claimed is: 1. An aluminum alloy conductor comprising an impurity, wherein the crystal grain size in the cross section perpendicular to the wire drawing direction is 5 to 25 μm.
The aluminum alloy conductor according to claim 6, further comprising 0.001 to 0.1 mass% of Zr.
The mass ratio (W1 / W2) of the total content (W1) of the content of at least one element selected from the group consisting of Sn, Cd and In to the content (W2) of Zr is 0.6 to 2.6 The aluminum alloy conductor according to claim 7, characterized in that:
The number of repeated fractures is 80,000 times or more when a tensile strength of 120 MPa or more and a conductivity of 52% IACS or more and a bending strain of ± 0.17% is applied. The aluminum alloy conductor according to any one of the items.
The aluminum alloy conductor according to any one of claims 6 to 9, wherein the conductor is used as a battery cable, a harness or a wire for a motor in a moving body.
The aluminum alloy conductor according to any one of claims 6 to 10, wherein the conductor is used for a vehicle, a train, or an aircraft.
0.01 to 0.4 mass% of Fe, 0.3 to 0.5 mass% of Cu, 0.04 to 0.3 mass% of Mg, 0.02 to 0.3 mass% of Si, Sn, It contains 0.01 to 0.5 mass% in total of at least one element selected from the group consisting of Cd and In, further contains 0.001 to 0.01 mass% of total of Ti and V, and the balance Al and unavoidable After melting the aluminum alloy component consisting of impurities, it is subjected to continuous casting and rolling to form a rough bar, cold wire drawing to a rough draw wire, heat treatment, wire drawing to a wire, and annealing heat treatment A method for producing an aluminum alloy conductor, comprising the steps of: performing the annealing heat treatment at a temperature of 300 to 450 ° C. for 10 minutes to 6 hours. .
0.01 to 0.4 mass% of Fe, 0.3 to 0.5 mass% of Cu, 0.04 to 0.3 mass% of Mg, 0.02 to 0.3 mass% of Si, Sn, A total of 0.01 to 0.5 mass% of at least one element selected from the group consisting of Cd and In, further containing 0.001 to 0.01 mass% of a combination of Ti and V, and Zr of 0. After melting the aluminum alloy component which contains 001 to 0.1 mass% and consists of the balance Al and unavoidable impurities, it is continuously cast and rolled into a rough bar, cold drawn into a rough drawn wire, heat treated, and drawn. It is a manufacturing method of aluminum alloy conductor which performs the process of performing wire processing, making it a wire rod, and also performing annealing heat treatment, and performing the above-mentioned annealing heat treatment under conditions of temperature 300-450 ° C for 10 minutes-6 hours. Method for producing an aluminum alloy conductor, wherein.
0.01 to 0.4 mass% of Fe, 0.3 to 0.5 mass% of Cu, 0.04 to 0.3 mass% of Mg, 0.02 to 0.3 mass% of Si, Sn, A total of 0.01 to 0.5 mass% of at least one element selected from the group consisting of Cd and In, further containing 0.001 to 0.01 mass% of a combination of Ti and V, and Zr of 0. The mass ratio (W1 / W2) of the total content (W1) of the content of at least one element selected from the group consisting of Sn, Cd and In, including 001 to 0.1 mass%, and the content (W2) of Zr is The aluminum alloy component consisting of the balance Al and the inevitable impurities is melted and then subjected to continuous casting and rolling to form a rough bar, cold wire drawing to a rough draw wire, and heat treatment , Wire drawing A method of manufacturing an aluminum alloy conductor comprising: a step of annealing and heat treatment, wherein the annealing heat treatment is performed at a temperature of 300 to 450 ° C. for 10 minutes to 6 hours. Method of manufacturing alloy conductor.
An aluminum alloy containing 0.1 to 1 mass% of Cu, and 0.01 to 0.5 mass% in total of at least one element selected from the group consisting of Sn, Cd, and In, with the balance being Al and unavoidable impurities conductor.
Containing 0.1 to 1 mass% of Cu, and 0.01 to 0.5 mass% in total of at least one element selected from the group consisting of Sn, Cd, and In; Fe 0.01 mass% to 1.0 mass% And an aluminum alloy conductor containing 0.1 to 0.35 mass% of Mg, the balance being Al and unavoidable impurities.
The aluminum alloy conductor according to claim 15 or 16, further comprising 0.001 to 0.1 mass% of Zr.
Characterized in that a mass ratio of the total content (W1) of the content of at least one element selected from the group consisting of Sn, Cd and In to the content (W2) of Zr is 0.6 to 2.6. The aluminum alloy conductor according to claim 17.
The aluminum alloy conductor according to any one of claims 15 to 18, wherein the conductor is used as a battery cable, a harness or a wire for a motor in a moving body.
The aluminum alloy conductor according to any one of claims 15 to 19, wherein the conductor is used for a vehicle, a train, or an aircraft.
The aluminum alloy component giving the aluminum alloy composition according to any one of claims 15 to 18 is melted and then subjected to continuous casting and rolling to form a rough bar, cold wire drawing to a rough draw, and heat treatment 19. A method of manufacturing an aluminum alloy conductor according to any one of claims 15 to 18, comprising the steps of drawing a wire to form a wire and further performing annealing heat treatment, wherein the annealing heat treatment is carried out A method for producing an aluminum alloy conductor, which is a continuous heat treatment including rapid heating and quenching steps, which is performed by applying either of the following <1> or <2>:
<1> wire temperature y (° C.) and annealing time x (seconds),
0.03 ≦ x ≦ 0.55, and 26x -0.6 + 377 ≦ y ≦ 23.5x -0.6 +423
Continuous conduction heat treatment satisfying the relationship of; or <2> annealing furnace temperature z (° C.) and annealing time x (seconds),
1.5 ≦ x ≦ 5 and −50x + 550 ≦ z ≦ −36x + 650
Heat treatment during continuous running that satisfies the relationship of