JP2020050901A - Method for manufacturing aluminium alloy electric wire, aluminium alloy electric wire, and wire harness - Google Patents

Abstract

To provide a method for manufacturing an aluminium alloy electric wire, capable of preventing an aluminium alloy single wire from being broken and allowing a continuous intermediate annealing process when manufacturing a narrowed aluminium alloy single wire; the aluminium alloy electric wire; and a wire harness.SOLUTION: The method for manufacturing an aluminium alloy electric wire comprises: the first wire drawing step of drawing a rough drawn aluminium alloy wire; the intermediate annealing step of annealing the first drawn wire obtained in the first wire drawing step; the second wire drawing step of drawing the intermediate annealing drawn wire obtained in the intermediate annealing step; and the finish-annealing step of annealing the second drawn wire obtained in the second wire drawing step. The intermediate annealing step is performed for less than 10 minutes at 400-640°C.SELECTED DRAWING: None

Description

  The present invention relates to a method for manufacturing an aluminum alloy electric wire, an aluminum alloy electric wire, and a wire harness used for a wire harness of an automobile and the like.

  Conventionally, copper electric wires including copper wires have been used as electric wires used for automobile wire harnesses and the like. However, in recent years, aluminum alloy electric wires including aluminum alloy strands have been used to reduce the weight of conductors.

  Patent Document 1 discloses a method of manufacturing an aluminum alloy strand in which an aluminum alloy conductor is subjected to a heat treatment at a temperature of 300 ° C. to 450 ° C. for 10 minutes to 6 hours in an intermediate annealing step. Is described.

  Patent Literature 2 describes a method for manufacturing an aluminum alloy element wire containing at least one of Fe, Zr, and Si, and Cu and Mg, with the balance being aluminum and unavoidable impurities.

  Further, Patent Document 3 describes a method of manufacturing an aluminum alloy wire which contains Fe, Mg, and Si and is subjected to solution heat treatment by continuous electric heat treatment and then aging heat treatment.

Japanese Patent No. 5193374 International Publication No. 2011/004814 JP 2013-44038 A

  In recent years, it has been demanded that aluminum alloy strands be made thinner in view of demands such as flexibility. Specifically, it is desired to reduce the diameter of the aluminum alloy strand to, for example, about 0.1 mm in diameter.

  Further, in such a method for manufacturing an aluminum alloy strand, in the next annealing step, while the fed aluminum alloy wire and the like such as the first drawn wire, the second drawn wire, and the stranded wire conductor are moved. It is desired to adopt a heat treatment step from the viewpoint of manufacturing cost and the like. Further, in the above manufacturing method, a step of heat-treating the fed aluminum alloy wire or the like in a second wire drawing step, a twisting step, and a step of coating a stranded wire conductor in an annealing step, which is a so-called continuous step. Adoption of the heat treatment step is desired from the viewpoint of manufacturing cost and the like. Here, the first wire drawing means a wire obtained in the first wire drawing step which is the first wire drawing step. The second wire drawing means a wire rod obtained in a second wire drawing step which is a wire drawing step performed after the first wire drawing step.

  However, when the aluminum alloy wire is drawn to a diameter of about 0.1 mm by a conventional manufacturing method, the wire is easily broken due to a large workability. Specifically, if the diameter of the aluminum alloy strand is reduced to less than 0.32 mm in the conventional manufacturing method, the wire may be broken.

  Further, when the aluminum alloy wire is thinned to a diameter of about 0.1 mm, the processing strain is large, so that the element that lowers the conductivity is dissolved in the aluminum alloy wire. Usually, as a method of precipitating such a solid solution element, aging treatment involving heating is performed for a long time. However, if the heat treatment performed in the aging treatment is for a long time, a continuous heat treatment step cannot be adopted.

  Specifically, in the manufacturing method described in Patent Document 1, the finish annealing step is as short as 0.03 to 0.55 seconds by continuous electric heat treatment, but the intermediate annealing step is as long as 10 minutes or more. The intermediate annealing process cannot be performed. Note that Patent Document 3 describes an energization continuous heating process for a solution treatment, which is different from a continuous intermediate annealing process.

  As described above, the conventional method for manufacturing an aluminum alloy wire has a problem that when the wire is thinned, the aluminum alloy wire is easily broken, and a continuous intermediate annealing step and a continuous finish annealing step are difficult. there were

  The present invention has been made in view of the above circumstances, and when manufacturing a thinned aluminum alloy strand, the aluminum alloy strand is difficult to break and a continuous intermediate annealing step and a continuous finish annealing step are performed. An object of the present invention is to provide a method of manufacturing a possible aluminum alloy electric wire. Further, the present invention provides an aluminum alloy electric wire in which an aluminum alloy element wire is hardly broken when a thinned aluminum alloy element wire is manufactured and a continuous intermediate annealing step and a continuous finish annealing step can be performed. With the goal. Further, the present invention relates to a wire provided with an aluminum alloy electric wire in which the aluminum alloy wire is hardly broken when manufacturing a thinned aluminum alloy wire and a continuous intermediate annealing step and a continuous finish annealing step are possible. The purpose is to provide a harness.

  The method for producing an aluminum alloy electric wire according to the first aspect of the present invention includes a first drawing step of drawing an aluminum alloy rough drawn wire, and a first drawing step obtained in the first drawing step. An intermediate annealing step for annealing, a second drawing step for drawing the intermediate annealing drawn wire obtained in the intermediate annealing step, and annealing the second drawn wire obtained in the second drawing step And a final annealing step, wherein the intermediate annealing step is performed at 400 to 640 ° C. for less than 10 minutes.

In the method for manufacturing an aluminum alloy electric wire according to the second aspect of the present invention, the following formula (1) is used in the first wire drawing step.
[Equation 1]
η ₁ = ln (A ₀ / A ₁ ) (1)
(Where η ₁ is the first working degree, A ₀ is the cross-sectional area of the aluminum alloy rough wire before the first wire drawing step, and A ₁ is the first wire drawn after the first wire drawing step. The cross-sectional area of is shown.)
Is defined in the range of ₁ to 9.

In the method for manufacturing an aluminum alloy electric wire according to the third aspect of the present invention, the following formula (2) is used in the second wire drawing step.
[Equation 2]
η ₂ = ln (A _IM / A ₂ ) (2)
(Where η ₂ is the second workability, _AIM is the cross-sectional area of the intermediate annealing wire drawn before the second wire drawing step, and A ₂ is the second wire drawn obtained after the second wire drawing step. The cross-sectional area of is shown.)
Wherein the second working ratio eta ₂ is that in defined is 6 or less.

  A method for manufacturing an aluminum alloy electric wire according to a fourth aspect of the present invention is characterized in that the aluminum alloy wire constituting the aluminum alloy electric wire contains 0.1 to 1.0% by mass of Fe.

  In the method for manufacturing an aluminum alloy electric wire according to a fifth aspect of the present invention, the aluminum alloy strand further comprises 0 to 0.08% by mass of Zr, 0.02 to 2.8% by mass of Si, and Ti 0.001 to 0.009 mass%, and at least one of Cu and Mg. When Cu is contained, 0.05 to 0.63 mass% of Cu is contained. When it contains Cu and Mg, the total amount of Cu and Mg is contained in an amount of 0.04 to 0.63% by mass.

  An aluminum alloy electric wire according to a sixth aspect of the present invention is obtained by the method for producing an aluminum alloy electric wire, wherein the aluminum alloy strand has a tensile strength of 121 MPa or more, an elongation of 17% or more, and a conductivity of 56.1%. It is characterized by being at least IACS.

  A wire harness according to a seventh aspect of the present invention includes the aluminum alloy electric wire.

  The method for manufacturing an aluminum alloy electric wire according to the present invention is such that when manufacturing a thinned aluminum alloy wire, the aluminum alloy wire is hardly disconnected, and a continuous intermediate annealing step and a continuous finish annealing step are possible. It is. Further, the aluminum alloy electric wire according to the present invention, when producing a thinned aluminum alloy strand, the aluminum alloy strand is hard to be broken, and using a continuous intermediate annealing step and a continuous finish annealing step. Can be manufactured. Further, according to the wire harness according to the present invention, a wire harness having tensile strength, elongation and electrical conductivity preferable for a wire harness for a vehicle or the like can be obtained.

  Hereinafter, the method for manufacturing the aluminum alloy electric wire of the present embodiment will be specifically described.

[Production method of aluminum alloy electric wire]
The method for manufacturing an aluminum alloy electric wire of the present embodiment includes a first wire drawing step, an intermediate annealing step, a second wire drawing step, and a finish annealing step.

(First wire drawing process)
The first wire drawing step is a step of drawing an aluminum alloy rough wire. Here, the aluminum alloy rough drawn wire is a rough drawn wire having substantially the same composition as the aluminum alloy strand obtained in the present embodiment. Hereinafter, the aluminum alloy rough wire will be described.

<Aluminum alloy rough wire>
The aluminum alloy rough wire is a rough wire made of an aluminum alloy containing aluminum as a main component. The aluminum alloy rough drawn wire is usually obtained by dissolving a raw material aluminum and a desired element by a conventional method and performing a rolling process such as a continuous casting and rolling method. The diameter of the cross section of the aluminum alloy rough wire is usually 5 to 20 mm, preferably 7 to 15 mm.

  The aluminum alloy, which is the material of the aluminum alloy rough drawing wire, is an alloy obtained by adding elements such as Fe, Zr, Si, Ti, Cu, and Mg to raw aluminum, such as aluminum ingot, as necessary.

  As the aluminum base metal, it is preferable to use pure aluminum having a purity of 99.7% by mass or more. In the present embodiment, as the aluminum metal, a first-type aluminum metal having a purity of 99.7% by mass or more, a special type 2 aluminum metal having a purity of 99.85% by mass or more, and a 99-90% by mass or more. Special type 1 aluminum bullion or the like can be used. In the present invention, a relatively inexpensive type 1 aluminum ingot can be used, so that the manufacturing cost of the aluminum alloy electric wire can be reduced.

  The aluminum alloy rough wire preferably contains 0.1 to 1.0% by mass of Fe, more preferably 0.4 to 0.9% by mass.

  Fe is an element that has a low solid solubility limit and easily precipitates in the aluminum alloy rough drawn wire. When the aluminum alloy rough drawing wire contains Fe, the strength increases due to precipitation strengthening while keeping the conductivity high. When an aluminum alloy containing Fe is cast and rolled, an intermetallic compound containing Fe is crystallized in the resulting aluminum alloy rough wire. This intermetallic compound is well dispersed in the aluminum alloy rough wire and increases the strength of the aluminum alloy rough wire. When the aluminum alloy rough drawing wire contains Fe in the above range, the effect of increasing the strength with high conductivity is high.

  The aluminum alloy rough wire preferably contains Zr in an amount of 0 to 0.08% by mass, more preferably 0.001 to 0.08% by mass, and still more preferably 0.002 to 0.05% by mass.

  When the aluminum alloy rough drawing wire contains Zr, heat resistance is improved. When the aluminum alloy rough drawing wire contains Zr within the above range, the effect of improving heat resistance with high conductivity is high. The aluminum alloy rough wire preferably contains Zr in addition to Fe.

  The aluminum alloy rough wire preferably contains Si in an amount of 0.02 to 2.8% by mass, more preferably 0.02 to 1.8% by mass, and still more preferably 0.02 to 0.25% by mass.

  When the aluminum alloy rough drawing wire contains Si, the strength is improved. When the aluminum alloy rough wire contains Si within the above range, the effect of improving the strength is high. Further, the aluminum alloy rough wire preferably contains Si in addition to Fe.

  The aluminum alloy rough wire preferably contains 0.001 to 0.009% by mass, more preferably 0.003 to 0.007% by mass of Ti.

  When the aluminum alloy rough wire contains Ti, the crystal grains in the aluminum alloy rough wire become finer and workability is improved, so that the frequency of disconnection during the production of the aluminum alloy wire is reduced. When the aluminum alloy rough wire contains Ti in the above range, the frequency of disconnection can be further reduced without lowering the conductivity. Preferably, the aluminum alloy rough wire includes Ti in addition to Fe.

  The aluminum alloy rough wire preferably contains at least one of Cu and Mg. When the aluminum alloy rough wire contains Cu, it preferably contains Cu in an amount of 0.05 to 0.63% by mass, more preferably 0.2 to 0.5% by mass. When the aluminum alloy rough wire contains Mg, it preferably contains 0.04 to 0.45% by mass, more preferably 0.15 to 0.37% by mass. Further, when the aluminum alloy rough wire includes Cu and Mg, the total amount of Cu and Mg is preferably 0.04 to 0.63% by mass, more preferably 0.15 to 0.5% by mass.

  When the aluminum alloy rough wire contains at least one of Cu and Mg, the strength is improved by solid solution strengthening. When the aluminum alloy rough wire contains at least one of Cu and Mg within the above range, the effect of improving strength is high. Further, the aluminum alloy rough wire preferably includes at least one of Cu and Mg in addition to Fe.

  The aluminum alloy rough wire is obtained by adding 0.1 to 1.0 mass% of Fe, 0 to 0.08 mass% of Zr, 0.02 to 2.8 mass% of Si, and 0.001 to 0.001 mass% of Ti. Preferably, the content is 0.009% by mass. Further, the aluminum alloy rough wire preferably further contains at least one of Cu and Mg. The aluminum alloy rough drawing line contains 0.05 to 0.63 mass% of Cu when containing Cu, 0.04 to 0.45 mass% of Mg when containing Mg, and Cu and Mg when containing Cu and Mg. Is preferably contained in an amount of 0.04 to 0.63% by mass.

  When the aluminum alloy rough wire contains Fe, Zr, Si, Ti, Cu and Mg within the above range, the effects of the respective components of Fe, Zr, Si, Ti, Cu and Mg on the aluminum alloy rough wire are expressed in a well-balanced manner. I do.

  If the aluminum alloy rough wire contains Zr, Si, Ti, Cu and Mg in amounts exceeding the upper limit of the above range, the conductivity of the obtained aluminum alloy strand is likely to decrease. The conductivity of the aluminum alloy strand obtained by the method for producing an aluminum alloy strand of the present embodiment is preferably 51% IACS or more, more preferably 58% IACS or more.

  In addition, the content of each element in the above aluminum alloy rough wire is the amount of the element inevitably contained in the aluminum ingot as the base material or in the production and the element intentionally added to the aluminum ingot. It is the total amount with the added amount.

  The aluminum alloy rough wire may contain inevitable impurities other than Al, Fe, Zr, Si, Ti, Cu and Mg. Examples of inevitable impurities include zinc (Zn), nickel (Ni), manganese (Mn), chromium (Cr), tin (Sn), vanadium (V), gallium (Ga), boron (B), and sodium (Na). ).

  The content of the unavoidable impurities in the aluminum alloy rough drawn wire is usually 0.07% by mass or less, preferably 0.05% by mass or less, as the total amount of the inevitable impurities. When the content of V in the inevitable impurities, particularly V, is large, the conductivity of the obtained aluminum alloy strand is easily reduced. For this reason, it is preferable that the content of V in the aluminum alloy rough drawn wire is 0.02% by mass or less. When the content of the inevitable impurities in the aluminum alloy rough drawn wire is within the above range, the effect of the manufacturing method of the present embodiment is not impaired, and the characteristics of the aluminum alloy electric wire obtained by this manufacturing method are significantly affected. Absent.

  The above-mentioned aluminum alloy rough wire is manufactured by a known method such as a continuous casting and rolling method and an extrusion method after adding a predetermined element to an aluminum base metal.

As a drawing method for drawing the aluminum alloy rough drawing in the first drawing step, a known dry drawing method or wet drawing method is used. In the first wire drawing step, the following equation (1)
[Equation 3]
η ₁ = ln (A ₀ / A ₁ ) (1)
(Where η ₁ is the first working degree, A ₀ is the cross-sectional area of the aluminum alloy rough wire before the first wire drawing step, and A ₁ is the first wire drawn after the first wire drawing step. The cross-sectional area of is shown.)
First working ratio eta ₁ is that in defined, typically 1-9, preferably 2-9, more preferably in the range of 4-8.

When the first working ratio eta ₁ is 1 or more, in the heat treatment of the intermediate annealing step is next step, the elongation of the first drawing that recrystallized grains can be obtained without coarsening becomes sufficient, the second Disconnection during the wire drawing step can be prevented. Further, since the first working ratio eta ₁ is When it is 9 or less, the residual strain of the first drawing obtained from growing too large, it is possible to prevent disconnection during wire drawing step.

  The first drawn wire obtained by passing the aluminum alloy rough drawn wire through the first drawing step has substantially the same composition as the aluminum alloy rough drawn wire, but has a smaller wire diameter and has processing strain inside. .

(Intermediate annealing process)
The intermediate annealing step is a step of annealing the first drawn wire obtained in the first drawing step. In the intermediate annealing step, the first wire drawn hardened in the first wire drawing step is heated to remove processing strain in the first wire drawing and to form and grow recrystallized grains to form the first wire. This is a step of imparting flexibility to the drawing. Further, the intermediate annealing step is a step of further depositing an element which forms a solid solution in the first wire drawing step and lowers the electrical conductivity. This intermediate annealing step is also a step capable of precipitating elements that could not be sufficiently precipitated due to a short cooling time in the conventional continuous casting rolling method or extrusion method, and thus is an effective step for element precipitation. It is. In the first drawing, the size and arrangement of the crystal grains are changed by the intermediate annealing step, so that the first drawing is an intermediate annealing drawing.

  The temperature of the intermediate annealing treatment in the intermediate annealing step is usually 400 to 640 ° C, preferably 430 to 640 ° C. The temperature of the intermediate annealing means the highest temperature in the case of the continuous intermediate annealing described below. When the temperature of the intermediate annealing is within the above range, the removal of working strain during the first drawing, the formation and growth of recrystallized grains during the first drawing, and the flexibility to the intermediate annealing drawing. The functions of imparting and precipitating the elements sufficiently occur. For this reason, the occurrence of disconnection in the second drawing step performed after the intermediate annealing step can be substantially eliminated or suppressed.

  The intermediate annealing treatment in the intermediate annealing step is performed for less than 10 minutes, preferably for 0.01 seconds to 5 minutes, more preferably for 0.1 seconds to 5 minutes.

  When performing the intermediate annealing treatment in the above temperature range, the intermediate annealing time is 10 minutes, the action of removing the processing strain during the first drawing, the action of imparting flexibility to the intermediate annealing drawing, and the first drawing. At least one of the precipitation actions of the elements dissolved in the process is substantially saturated. That is, when performing the intermediate annealing treatment in the above temperature range, these effects do not improve even if the intermediate annealing time is set to 10 minutes or more. For this reason, if the time of the intermediate annealing treatment is less than 10 minutes, it is not necessary to perform an extra intermediate annealing treatment, and the intermediate annealing step can be a continuous intermediate annealing treatment (continuous intermediate annealing treatment). Become. When the intermediate annealing time is 0.01 seconds or more, the effect of removing the processing strain during the first drawing and the effect of imparting flexibility to the intermediate annealing drawn are sufficiently exhibited. If the intermediate annealing time is 0.1 second or more, in addition to these effects, the effect of precipitating the elements dissolved in the first wire drawing step is sufficiently exhibited. In addition, the precipitation effect of the solid solution element appears as a precipitation effect of an intermetallic compound mainly containing Fe.

  Here, the continuous intermediate annealing process is a process of continuously performing the intermediate annealing process while moving the first drawn wire sent from the line of the first drawing process, or the first drawn wire sent. It means a process of performing intermediate annealing before sending the wire to the line in the second drawing process.

  Further, when the time of the intermediate annealing treatment is less than 10 minutes, the strength and elongation of the first drawn wire obtained without recrystallized grains being unnecessarily coarsened become sufficient, and the breakage of the first drawn wire is reduced. Can be prevented.

  The above-described continuous intermediate annealing will be described more specifically. As the continuous intermediate annealing process, for example, a continuous running heat treatment, a continuous current heating process, and a continuous dielectric heating process are used.

  Here, the continuous running heat treatment is a process of continuously heating the first drawn wire by continuously passing the first drawn wire through an annealing furnace maintained at a high temperature. In addition, the continuous energization heating treatment means that a first wire is continuously passed through two electrode rings, thereby causing a current to flow in the first wire and generating Joule heat in the first wire. This is a process of annealing the first drawn wire by Joule heat. Further, the continuous dielectric heat treatment means that Joule heat is generated in the first drawn wire by eddy current by continuously passing the first drawn wire in an AC electric field, and the first drawn wire is generated by the Joule heat. Is a process of annealing.

  By the way, in order to perform the above-mentioned continuous intermediate annealing process, the processing time of the intermediate annealing process is required to be short due to restrictions on the line length of the intermediate annealing process. On the other hand, in the intermediate annealing step of the manufacturing method of the present embodiment, since the processing time of the intermediate annealing is short, continuous intermediate annealing can be performed.

In the manufacturing method of the present embodiment, the reason why the intermediate annealing time in the intermediate annealing step can be shortened to less than 10 minutes is because of the composition of the aluminum alloy rough drawing and the first drawing in the first drawing step. and numerical range of working ratio eta ₁ is presumed to be the result of impact in a complex manner. That is, during the first drawing, which is a raw material of the intermediate annealing step, processing strain due to being drawing in the first working ratio eta ₁ in the first drawing process is occurring. In the intermediate annealing step, the work strain during the first wire drawing promotes precipitation of alloy components to shorten the time of the intermediate annealing process, and the work strain during the first wire drawing is removed. It is speculated that there is.

  When the time of the intermediate annealing treatment is within the above range, moderate flexibility is imparted to the intermediately drawn wire obtained in the intermediate annealing step, and the occurrence of disconnection in the second drawing step performed after the intermediate annealing step is generated. Can be substantially eliminated or suppressed.

  The intermediately drawn wire obtained by the first drawn wire through the intermediate annealing step has substantially the same composition as the aluminum alloy rough drawn wire and the first drawn wire, but part or all of the internal working strain is removed. As a result, recrystallized grains are formed and moderate flexibility is imparted.

(Second wire drawing process)
The second wire drawing step is a step of drawing the intermediate annealed wire obtained in the intermediate annealing step. As a wire drawing method for drawing the intermediate annealed wire in the second wire drawing step, a known dry wire drawing method or wet wire drawing method is used as in the first wire drawing step.

In the second wire drawing step, the following equation (2)
[Equation 4]
η ₂ = ln (A _IM / A ₂ ) (2)
(Where η ₂ is the second workability, _AIM is the cross-sectional area of the intermediate annealing wire drawn before the second wire drawing step, and A ₂ is the second wire drawn obtained after the second wire drawing step. The cross-sectional area of is shown.)
In the second working ratio eta ₂ is as defined, usually 6 or less, preferably 0.3 to 6, more preferably in the range of 0.3 to 5.

When the second working ratio η ₂ is 6 or less, the strength of the obtained second wire drawing does not become too high, so that an excessive force is not required in the wire drawing process. Can be prevented. Further, when the second working ratio eta ₂ is at least 0.3, in the heat treatment of the finish annealing step which is the next step, the strength and elongation of the second drawing recrystallization amount is obtained without coarsening enough Thus, disconnection of the second wire drawing can be prevented. Incidentally, when the second working ratio eta ₂ exceeds 6, drawability of the second drawing may be decreased.

  The second drawn wire obtained by passing the intermediate annealing wire through the second drawing step has substantially the same composition as the aluminum alloy rough drawn wire, the first drawn wire and the intermediate annealed drawn wire, but has a wire diameter of It becomes smaller and has processing strain inside.

In the manufacturing method according to the present embodiment, the first working degree η ₁ defined by the above-described equation (1) in the first drawing step and the first working degree η ₁ defined by the above-described equation (2) in the second drawing step are used. the sum of the working ratio eta ₂ of 2, preferably 8.5 to 9.5, more preferably 8.9 to 9.3.

(Finish annealing process)
The finish annealing step is a step of annealing the second drawn wire obtained in the second drawing step. In the finish annealing step, the second wire drawn hard in the second wire drawing step is subjected to a heat treatment, thereby removing the processing strain during the second wire drawing, and forming and growing recrystallized grains during the wire drawing. This is a step of imparting flexibility to the second wire drawing. In addition, the finish annealing step is also a step of precipitating an element that cannot be sufficiently precipitated in the intermediate annealing step. In the second drawing, after the finish annealing step, the size and arrangement of the crystal grains are changed to become the aluminum alloy strand.

  The finish annealing step is desirably a continuous finish annealing treatment (continuous finish annealing treatment) from the viewpoint of manufacturing costs and the like, but may be a batch type finish annealing treatment. As the continuous finish annealing, for example, a continuous running heat treatment, a continuous energization heating treatment, and a continuous dielectric heating treatment are used in the same manner as the continuous intermediate annealing treatment. As the batch-type finish annealing, for example, a method is used in which the second drawn wire is wound around a coil or the like and then held in an annealing furnace for a certain period of time.

  In the case of continuous finish annealing, the temperature of the finish annealing is usually 400 to 660 ° C, preferably 430 to 650 ° C. When the temperature of the finish annealing treatment is within the above range, the obtained aluminum alloy strand has excellent flexibility, and has high strength and elongation. If the temperature of the finish annealing is lower than 400 ° C., the obtained aluminum alloy strand may have low flexibility. Further, when the temperature of the finish annealing treatment exceeds 660 ° C., the obtained aluminum alloy strand may have low strength and low elongation.

  In the case of continuous finish annealing, the time of the finish annealing is usually 0.01 seconds to 10 minutes, preferably 0.01 seconds to 1 minute. When the time of the finish annealing treatment is within the above range, the obtained aluminum alloy strand is excellent in flexibility, strength and elongation. If the time of the finish annealing treatment is less than 0.01 second, the obtained aluminum alloy strand may have low flexibility. In addition, when the time of the finish annealing treatment is 10 minutes or less, it is not necessary to perform an extra finish annealing treatment for annealing more than necessary, and it is possible to continuously perform the finish annealing step if necessary.

  The aluminum alloy strand from which the second wire is drawn through the finish annealing step has substantially the same composition as the aluminum alloy rough drawn wire, the first drawn wire, and the second drawn wire. Part or all of them are removed, and recrystallized grains are formed, so that appropriate flexibility is imparted. The aluminum alloy strand has substantially the same composition as that of the aluminum alloy rough drawn wire and the like, and the composition of the aluminum alloy rough drawn wire is as described above. Therefore, description of the composition of the aluminum alloy strand is omitted.

  In the manufacturing method of the present embodiment, a cooling step, an aging step, and the like may be further performed on the obtained aluminum alloy strand, if necessary.

  In the manufacturing method of the present embodiment, the aluminum alloy strand is hardly broken even if the wire is thinned. For this reason, according to the manufacturing method of the present embodiment, the drawability indicating the number of disconnections from the production of a 1-ton rough drawn wire (a rough drawn aluminum alloy wire) to the production of an aluminum alloy strand having a wire diameter of 0.1 mm is usually lower. It becomes 40 times / 99 times / ton, preferably 39 times / ton or less.

  The aluminum alloy strand finally obtained by appropriately performing aging treatment or the like becomes a raw material of the aluminum alloy electric wire. The aluminum alloy electric wire usually includes a stranded conductor (core wire) obtained by twisting a plurality of aluminum alloy strands, and an insulating resin layer covering the surface of the stranded conductor. As a resin constituting the insulating resin layer, for example, an olefin resin such as cross-linked polyethylene or polypropylene, or vinyl chloride can be used. Further, the aluminum alloy electric wire may have an electromagnetic wave shielding layer or the like in addition to the stranded conductor and the insulating resin layer. Furthermore, after a plurality of second drawn wires are twisted to form a stranded wire conductor, a finish annealing step may be performed, and then an insulating resin layer may be formed. As a method of manufacturing an aluminum alloy electric wire using the aluminum alloy strand obtained by the manufacturing method of the present embodiment, a known method can be used.

  The obtained aluminum alloy electric wire can be used for applications such as vehicle electric wires, cables and other vehicle components, electric cables such as power cables and communication cables or electronic components, mechanical electric wires and other mechanical components, and building materials. .

[Aluminum alloy wire]
The aluminum alloy electric wire of the present embodiment is obtained by the above-described method for manufacturing an aluminum alloy electric wire, and the aluminum alloy wire is an aluminum alloy electric wire having a predetermined tensile strength, elongation, and conductivity. The aluminum alloy electric wire of the present embodiment is manufactured by using the aluminum alloy wire and using the method for manufacturing an aluminum alloy electric wire. As a method of manufacturing an aluminum alloy electric wire using the above aluminum alloy strand, a known method can be used.

  In the aluminum alloy electric wire of the present embodiment, the tensile strength of the aluminum alloy strand is usually 121 MPa or more, preferably 121 to 143 MPa, and the strength is high. In the aluminum alloy electric wire of the present embodiment, it is preferable that the tensile strength of the aluminum alloy strand having a wire diameter of 0.10 mm is within the above range.

  In the aluminum alloy electric wire of the present embodiment, the elongation of the aluminum alloy strand is usually 17% or more, preferably 17 to 26%, and the elongation is large. In the aluminum alloy electric wire of the present embodiment, it is preferable that the elongation of the aluminum alloy strand having a wire diameter of 0.10 mm is within the above range.

  In the aluminum alloy electric wire of the present embodiment, the electric conductivity of the aluminum alloy strand is usually 56.1% IACS or more, preferably 56.1 to 59.0% IACS, and the electric conductivity is large. In the aluminum alloy electric wire of the present embodiment, it is preferable that the electric conductivity of the aluminum alloy strand having a wire diameter of 0.10 mm is within the above range.

  The aluminum alloy strand constituting the aluminum alloy electric wire of the present embodiment preferably has a tensile strength of 121 MPa or more, an elongation of 17% or more, and a conductivity of 56.1% IACS or more. Further, the aluminum alloy strand constituting the aluminum alloy electric wire of the present embodiment more preferably has a tensile strength of 121 to 143 MPa, an elongation of 17 to 26%, and a conductivity of 56.1 to 59.0%. When all of the tensile strength, elongation and electric conductivity of the aluminum alloy wire are within the above ranges, an aluminum alloy electric wire having preferable tensile strength, elongation and electric conductivity for a wire harness for a vehicle or the like can be obtained. Further, when all of the tensile strength, elongation and electrical conductivity of the aluminum alloy wire are within the above range, a wire harness for a vehicle or the like having preferable tensile strength, elongation and electrical conductivity using this aluminum alloy electric wire. Is obtained.

  Aluminum alloy electric wires obtained by the above-described method for producing aluminum alloy electric wires are used for vehicle electric wires, cables and other vehicle components, electric and electronic components such as power cables and communication cables, mechanical components such as equipment electric wires and the like, and building materials. It can be used for applications such as. Specifically, the use of the vehicle component includes, for example, a wire harness.

[Wire Harness]
The wire harness of the present embodiment is a wire harness including the above-described aluminum alloy electric wire. The wire harness of the present embodiment can be manufactured by a known method using the above-described aluminum alloy electric wire. The wire harness of the present embodiment can be used as a wire harness for a vehicle.

  Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples.

[Examples 1 to 28, Comparative Examples 1 to 3]
An aluminum alloy having a component composition (% by mass) shown in Table 1 was obtained by using a type 1 aluminum ingot of JIS H 2102 and adding predetermined amounts of Fe, Zr, Si, Ti, Cu and Mg. This aluminum alloy was melted by a conventional method, and processed into a rough drawn wire (aluminum alloy rough drawn wire) having a wire diameter of 9.5 mm using a continuous casting and rolling method. The composition of the aluminum alloy rough wire was the same as that of the aluminum alloy.

Then, the aluminum alloy wire rod, using a continuous wire drawing machine, and drawing with the first working ratio eta ₁ shown in Table 2, to obtain drawn to wire rod (first drawing) ( First wire drawing step).
Further, the first drawn wire was continuously annealed (intermediate annealing) by energization under the conditions shown in Table 2 to obtain an intermediately annealed wire (intermediate annealed drawn wire). The temperatures shown in Table 2 are the highest attained temperatures (intermediate annealing step).
Next, the intermediate annealing drawing, a continuous wire drawing machine, and drawing with the second working ratio eta ₂ shown in Table 2, to obtain drawn to wire rod (second drawing) ( Second wire drawing step).
Further, the second drawn wire was continuously annealed (finish annealing) under the conditions shown in Table 2 to obtain an aluminum alloy strand. The temperatures shown in Table 2 are the highest attained temperatures (finish annealing step).

The obtained aluminum alloy strand having a wire diameter of 0.1 mm was evaluated for electrical conductivity, tensile strength, elongation, and drawability in accordance with JIS C3002.
The electrical conductivity was determined by measuring the specific resistance of the aluminum alloy strand using a four-terminal method in a thermostat kept at 20 ° C. (± 0.5 ° C.), and calculating the electrical conductivity from the specific resistance. The distance between the terminals when measuring the specific resistance was 1000 mm. The cross-sectional area of the aluminum alloy strand was calculated using a mass of the strand having a length of 1000 mm and a density of 2.7 g / cm ³ .
The tensile strength and elongation (elongation at break) were measured under the conditions of a tensile speed of 50 mm / min, an original gauge length of 100 mm, and a distance between grips of 150 mm according to JIS Z 2241. The cross-sectional area of the aluminum alloy strand was calculated using a mass of the strand having a length of 1000 mm and a density of 2.7 g / cm ³ .

The drawability was determined by counting the number of times the wire was broken from 1 ton rough wire (aluminum alloy rough wire) to manufacture an aluminum alloy strand. The number of disconnections was evaluated as ◎ when the number of disconnections was 39 times / ton or less, ○ when the number of disconnections was 40 to 99 times / ton, and Δ when the number of disconnections was 100 times / ton or more.
Table 3 shows the obtained results.

  As described above, the present invention has been described with the embodiments. However, the present invention is not limited to these, and various modifications can be made within the scope of the present invention.

  The method for manufacturing an aluminum alloy electric wire according to the present embodiment can be used, for example, in a method for manufacturing a wire harness. Further, the aluminum alloy electric wire of the present embodiment can be used, for example, as a wire harness. Furthermore, the wire harness of the present embodiment can be used as a wire harness for a vehicle.

Claims (7)

A first drawing step of drawing an aluminum alloy rough drawing wire;
An intermediate annealing step of annealing the first drawn wire obtained in the first drawing step;
A second drawing step of drawing the intermediate annealing drawn wire obtained in the intermediate annealing step;
A final annealing step of annealing the second drawn wire obtained in the second drawing step,
A method for producing an aluminum alloy electric wire, wherein the intermediate annealing step is performed at 400 to 640 ° C for less than 10 minutes. The following formula (1) in the first wire drawing step:
[Equation 1]
η ₁ = ln (A ₀ / A ₁ ) (1)
(Where η ₁ is the first working degree, A ₀ is the cross-sectional area of the aluminum alloy rough wire before the first wire drawing step, and A ₁ is the first wire drawn after the first wire drawing step. The cross-sectional area of is shown.)
The method for producing an aluminum alloy electric wire according to claim 1, wherein the first workability η1 defined by the following is in the range of ₁ to 9. The following formula (2) in the second wire drawing step:
[Equation 2]
η ₂ = ln (A _IM / A ₂ ) (2)
(Where η ₂ is the second workability, _AIM is the cross-sectional area of the intermediate annealing wire drawn before the second wire drawing step, and A ₂ is the second wire drawn obtained after the second wire drawing step. The cross-sectional area of is shown.)
In a defined production method for an aluminum alloy wire according to claim 1 or 2 second working ratio eta ₂ is equal to or more than 6 are.   The method for manufacturing an aluminum alloy electric wire according to any one of claims 1 to 3, wherein the aluminum alloy strand constituting the aluminum alloy electric wire contains 0.1 to 1.0% by mass of Fe. The aluminum alloy strand further comprises:
0 to 0.08% by mass of Zr,
Containing 0.02 to 2.8% by mass of Si and 0.001 to 0.009% by mass of Ti;
It contains at least one of Cu and Mg. When Cu is contained, Cu is 0.05 to 0.63% by mass. When Mg is contained, Mg is 0.04 to 0.45% by mass. When Cu and Mg are contained, The method for producing an aluminum alloy electric wire according to claim 4, wherein the total amount of Cu and Mg is contained in an amount of 0.04 to 0.63% by mass. Obtained by the method for producing an aluminum alloy electric wire according to claim 4 or 5,
An aluminum alloy electric wire, wherein the aluminum alloy strand has a tensile strength of 121 MPa or more, an elongation of 17% or more, and a conductivity of 56.1% IACS or more.   A wire harness comprising the aluminum alloy electric wire according to claim 6.