JP2022182462A - Metal material for foil yarn and foil yarn as well as twist yarn and cloth formed with foil yarn - Google Patents

Abstract

To provide a metal material for a foil yarn and a foil yarn as well as a twist yarn and clothing formed with the foil yarn, capable of preventing or suppressing a flexure crack when winding to a core material, in particular a core material having a relatively small outer diameter (for example 1.0 mm or less).SOLUTION: A metal material 1 has a ribbon shape constituting a foil yarn 3 wound in spiral on a foil-shaped core material 2, the metal material 1 being made of aluminum or aluminum alloy, where a width direction cross-section of the metal material 1 roughly forms a rectangular shape, and in view of the width direction cross-section of the metal material 1, a thickness t1 of a width direction central portion 4 is 1.05 time or more and 1.20 time or less relative to a thickness t2 of a width direction end portion 5, and tensile strength is 270 MPa or more and 750 MPa or less.SELECTED DRAWING: Figure 4

Description

The present invention relates to a metal material for foil yarns, and more particularly to a ribbon-shaped metal material for foil yarns made of high-strength aluminum or an aluminum alloy, foil yarns, and twisted yarns and fabrics formed using the foil yarns.

The foil thread has a ribbon-shaped metal foil and a core material, and is configured by spirally winding the ribbon-shaped metal foil around the core material. Therefore, the foil yarn has advantages such as being able to have a longer fatigue life and a lighter weight by reducing the amount of metal used as compared with a metal wire rod having the same outer diameter.

Since the foil yarn has the advantages described above, for example, in Patent Document 1, it is possible to use a foil yarn formed by winding a copper foil around a core material as a lead wire (tinsel wire) for an acoustic speaker. Have been described. In addition, the foil yarn is lighter in weight and has a better bending fatigue life than a metal wire rod having the same outer diameter, so it has been proposed to be used in applications where there is a possibility of repeated bending. For example, Patent Literature 2 describes the use of a foil yarn formed by winding a copper alloy foil tape around a high-strength fiber yarn for applications such as robot cables and sensor cables that require bending resistance. ing.

In addition, Patent Document 3 describes a conductive yarn configured by spirally winding a plurality of conductive fibers around a core material. It is described that a metal fiber having conductivity such as is used.

JP-A-53-99479 Japanese Utility Model Laid-Open No. 5-53045 Japanese Patent No. 5352795 Japanese Patent No. 6430080

In recent years, the use of foil yarn in so-called wearable devices such as clothes-type heaters and cameras attached to clothes or hats has been studied. However, in such wearable devices that may come into contact with the skin, the above-mentioned materials that make up the foil yarn are not recommended due to the risk of metal allergy, discoloration of the foil yarn due to reaction with sweat, weight reduction, material cost, etc. It is not preferable to use a copper-based material or an iron-based material.

Therefore, if the foil yarn can be made of aluminum or an aluminum alloy instead of the above-mentioned copper-based material or iron-based material, the above-mentioned problems such as the risk of metal allergy, discoloration, weight reduction, and material cost can be solved. It is possible. However, as described in Patent Documents 1 to 3, known foil yarns are formed using copper-based materials, iron-based materials, etc., and metal foils made of aluminum, aluminum alloys, etc. are used as core materials. At present, there is no foil thread that is wound in a spiral shape.

In addition, the present applicant has disclosed in Patent Document 4 an aluminum alloy material having a ribbon shape with unprecedented strength increased by optimizing the composition of the aluminum alloy and setting the Vickers hardness within a predetermined range. Proposed. However, Patent Document 4 does not describe a foil yarn formed by winding a ribbon-shaped aluminum alloy material around a fiber with a small wire diameter. No consideration is given to bending cracks, line breaks, etc. when winding an aluminum alloy material having

The present invention has been made in view of the above problems, and prevents or suppresses bending cracks when wound around a core material, particularly a core material having a relatively small outer diameter (for example, 0.1 mm or less). It is an object of the present invention to provide a metal material for a foil thread, a foil thread, and a twisted yarn and a cloth formed by using the foil thread.

The present inventors have found that the metal material for foil yarn is made of aluminum or an aluminum alloy having a tensile strength comparable to or higher than that of copper and copper alloys, and when viewed in cross section in the width direction of the metal material for foil yarn, By setting the thickness of the central portion within a predetermined range with respect to the thickness of the end portions in the width direction, it is possible to reduce the thickness of the foil yarn metal for a core material having a relatively small outer diameter (e.g., 0.1 mm or less). The inventors have found that bending cracks can be effectively suppressed even when the material is spirally wound to form a foil yarn, and have completed the present invention.

In order to achieve the above object, the gist and configuration of the present invention are as follows.
(1) A metal material for a foil thread having a ribbon shape that is spirally wound around a thread-like core material to form a foil thread, wherein the metal material is made of aluminum or an aluminum alloy. The cross section in the width direction has a substantially rectangular shape, and when viewed in the cross section in the width direction of the metal material, the thickness at the central portion in the width direction is 1.05 times or more the thickness at the end portions in the width direction1. 20 times or less, and a tensile strength of 270 MPa or more and 750 MPa or less.

(2) The aluminum alloy contains 0.10% by mass or more and 1.80% by mass or less of magnesium, 0.20% by mass or more and 2.10% by mass or less of silicon, and 0.01% by mass or more and 2.00% by mass of iron. % or less, the balance being aluminum and inevitable impurities.

(3) The aluminum alloy contains 0.10% by mass or more and 1.80% by mass or less of magnesium, 0.20% by mass or more and 2.10% by mass or less of silicon, and 0.01% by mass or more and 2.00% by mass of iron. % or less, and at least one component selected from the group consisting of titanium, boron, copper, silver, zinc, nickel, cobalt, gold, manganese, chromium, vanadium, zirconium and tin in a total amount of 0.5%. 02% by mass or more and 2.00% by mass or less of the metallic material for foil yarn according to (1) above, having an alloy composition in which the balance is aluminum and inevitable impurities.

(4) The metal material has an average thickness of 0.005 mm or more and 0.500 mm or less, an average width of 0.10 mm or more and 2.0 mm or less, and a cross-sectional area when measured in the width direction cross section, The metal material for foil yarn according to any one of (1) to (3) above, which has a thickness of 0.80 mm ² or less.

(5) A foil yarn formed by spirally winding the metal material for foil yarn according to any one of (1) to (4) above around the core material.

(6) The foil according to (5) above, wherein the width (W) of the metal material has a ratio (W/D) to the outer diameter (D) of the core material that is more than 0.5 and less than 5.0 It is a metal material for thread.

(7) A twisted yarn formed by twisting at least two foil yarns according to (6) above.

(8) A cloth formed by combining a plurality of foil yarns described in (6) above.

According to the present invention, the metal material for foil thread and the foil are capable of preventing or suppressing bending cracks when wound around a core material, particularly a core material having a relatively small outer diameter (for example, 0.1 mm or less). It is now possible to provide yarns and fabrics formed using yarns and foil yarns.

It is a figure which shows an example of the metal material for foil yarns which concerns on embodiment of this invention. FIG. 3 is a diagram showing an example of a thread-like core material that constitutes the foil thread according to the embodiment of the present invention. It is a figure which shows an example of the foil thread|yarn which concerns on embodiment of this invention. It is a figure which expands and shows the width direction cross section of the metal material for foil yarns.

Next, the metal material for foil thread according to the embodiment of the present invention and the foil thread using the same will be described below.

FIG. 1 is a diagram showing an example of a foil yarn metal material according to an embodiment of the present invention, and FIG. 2 is a diagram showing an example of a thread-like core material constituting a foil yarn in an embodiment of the present invention. 3 is a diagram showing an example of the foil thread according to the embodiment of the present invention, and FIG. 4 is an enlarged cross-sectional view of the metal material for the foil thread in the width direction.

[Metal materials for foil threads]
A metal material for foil thread (hereinafter simply referred to as "metal material") 1 has a ribbon shape shown in FIG. The foil thread 3 is constructed. Here, the "ribbon shape" means a flat filament shape, a tape shape, a band shape, and the like. More specifically, the cross section in the width direction of the metal material 1 has a substantially rectangular shape as shown in FIG. When the metal material 1 is viewed in cross section in the width direction, the thickness t1 of the central portion in the width direction (hereinafter, sometimes simply referred to as the “central portion”) 4 is equal to the thickness t1 of the end portions in the width direction (hereinafter, simply It is set to be 1.05 times or more and 1.20 times or less of the thickness t2 of 5. Moreover, the metal member 1 shown in FIG.

The substantially rectangular shape mentioned above includes, for example, a rectangular shape in which the four corners are smoothly curved and smoothly connected to each other, a flat elliptical shape, a flat oval shape, and the like. In the metal material 1 of the embodiment shown in FIG. 4, the end surfaces located at both ends in the width direction are convex curved surfaces. As shown in FIG. 4, the width direction of the metal material 1 means the direction in which the long sides of the substantially rectangular metal material 1 extend (horizontal direction in FIG. 4). means the length in the direction (the vertical direction in FIG. 4) in which the short sides of the substantially rectangular metal material 1 extend.

Furthermore, the widthwise central portion 4 of the metal material 1 is defined as the width W of the metal material 1 in the widthwise cross section of the metal material 1 shown in FIG. It means the part centered on the point position. In addition, the width direction end portion 5 of the metal material 1 means the distance from the width direction center portion 4 to the above vertex when the length from the width direction center portion 4 to the above vertex is measured in the cross section of the metal material 1 in the width direction. means a portion centered at a position corresponding to 95% of the length of . When the metal material 1 is spirally wound around the core material 2 to form the foil thread 3 as shown in FIG. It means the outermost portion in the width direction of the portions with which the material 1 contacts. Note that the width direction end portion 5 of the metal material can be determined in advance by experiments or the like.

In the embodiment of the present invention, the ratio of the thickness t1 of the central portion 4 to the thickness t2 of the end portion 5 (t1/t2 ratio) is 1.05 times or more and 1.20 times or less as described above. is set to When the t1/t2 ratio is less than 1.05, when the metal material 1 is spirally wound around the core material 2 as shown in FIG. Since it becomes easy to break, wire breakage is likely to occur. If the t1/t2 ratio exceeds 1.20 times, the central portion becomes thicker, and if the bending diameter is the same, the bending conditions become stricter, so shear bands are likely to occur, and bending from the portion where the shear body occurs Cracks are more likely to occur. Therefore, in the present invention, the ratio of the thickness t1 of the central portion 4 to the thickness t2 of the end portion 5 (t1/t2 ratio) is set to be 1.05 times or more and 1.20 times or less. Note that the line break means that the metal material 1 is stretched beyond its tensile strength and broken. Further, the shear band is a thin plate-like structure that is tilted about 35 degrees with respect to the longitudinal direction of the foil when local strain is applied to the metal such as bending or rolling. This is caused by local deformation, such as bending and rolling, where the deformation site is restricted, and the site receives a large shear strain. When the steel is used for a long period of time, if the formation of shear bands progresses due to fatigue or the like, many shear bands are formed in the vicinity of the positions where the shear bands are formed, leading to bending cracks and fractures from the relevant positions.

Moreover, it is preferable to set the width W of the metal material 1 so that the ratio (W/D ratio) to the outer diameter D of the core material 2 around which the metal material 1 is wound is more than 0.5 and less than 5.0. That is, when the W/D ratio is 0.5 or less, the width W of the metal material 1 becomes relatively narrow, or the outer diameter of the core material 2 becomes relatively large. Therefore, the winding amount or the twist rate of the metal material 1 wound per unit length of the core material 2 increases, which increases the resistance when energized, increases the weight of the foil yarn 3 per unit length, There is a concern that the metal material 1 may break due to unwinding of the metal material 1 due to bending or twisting. In the worst case, there is a possibility of short-circuiting in current-carrying applications. Also, material costs may increase.

On the other hand, when the W/D ratio is 5.0 or more, the width W of the metal material 1 is relatively wide, or the outer diameter of the core material 2 is relatively thin. Therefore, when the metal material 1 is wound around the core material 2, the bending diameter becomes small, and there is a possibility that bending cracks may occur in the processing or manufacturing stage of the foil yarn 3. Moreover, if the bending diameter of the foil thread 3 is small, not only the portion of the core material 2 exposed from the gap 6 of the metal material but also the portion of the metal material 1 wound around the core material 2 is bent. In some cases, the metal material 1 may be bent, and in this case, bending cracks or breaks may occur in the metal material 1 . Therefore, it is preferable to set the W/D ratio to be greater than 0.5 and less than 5.0.

The metal material 1 can be made of, for example, (pure) aluminum or an aluminum alloy, and its tensile strength must be 270 MPa or more and 750 MPa or less. That is, when the metal material 1 is wound around, for example, a bobbin or roll (not shown), the metal material 1 is wound under a predetermined tension in order to prevent unwinding. Therefore, in order to prevent the metal material 1 from breaking during winding, it is necessary that the tensile strength is 270 MPa or more. Also, if the tensile strength exceeds 750 MPa, so-called unwinding occurs when winding onto a bobbin or roll, making winding difficult.

Examples of pure aluminum include 1000 series aluminum containing 99% by mass or more of aluminum. In addition, as for the aluminum alloy, in order to perform wire drawing and rolling to a desired small diameter so that processing defects such as wire breakage and cracking do not occur, the mother phase and aluminum alloy must be It must be a structure that can withstand the deformation of Based on this, in the embodiment of the present invention, the aluminum alloy is preferably a 6000 series aluminum alloy, an 8000 series aluminum alloy, or the like, and in terms of strength and workability, among these aluminum alloys, 6000 series aluminum is more preferable. .

[Composition of aluminum alloy]
Specifically describing the composition of the aluminum alloy that constitutes the metal material 1, it is necessary to adjust the ratio of additive elements based on the composition of clusters, intermetallic compounds, and precipitates. Based on this, the aluminum alloy material constituting the metal material 1 contains 0.10% by mass or more and 1.80% by mass or less of magnesium, 0.20% by mass or more and 2.10% by mass or less of silicon, and 0.1% by mass or less of iron. It is preferable to have an alloy composition containing 01% by mass or more and 2.00% by mass or less, with the balance being aluminum and unavoidable impurities. In addition, in the following description, each element mentioned above is described with an element symbol.

<Magnesium: 0.10% by mass or more and 1.80% by mass or less>
Mg (magnesium) has the effect of solid-solving into the aluminum base material to strengthen it, and also has the effect of improving the tensile strength through a synergistic effect with Si. However, if the Mg content is less than 0.10% by mass, the above effects are insufficient. wire workability, bending workability, etc.) are deteriorated. Therefore, the Mg content is 0.10 to 1.80% by mass, preferably 0.40 to 1.40% by mass.

<Silicon: 0.20% by mass or more and 2.10% by mass or less>
Si (silicon) has the effect of solid-solving in the aluminum base material to strengthen it, and also has the effect of improving tensile strength and bending fatigue resistance through a synergistic effect with Mg. However, if the Si content is less than 0.20% by mass, the above effects are insufficient, and if the Si content exceeds 2.10% by mass, crystallized substances are formed and workability is reduced. do. Therefore, the Si content should be 0.20 to 2.10% by mass, preferably 0.40 to 1.40% by mass.

<Iron: 0.01% by mass or more and 2.00% by mass or less>
Fe (iron) is an element that contributes to refinement of crystal grains and improves tensile strength by mainly forming Al—Fe-based intermetallic compounds. Here, an intermetallic compound means a compound composed of two or more kinds of metals. Only 0.05% by mass of Fe can be solid-dissolved in Al at 655° C., and even less at room temperature. It crystallizes or precipitates as an intermetallic compound such as a -Fe-Si-Mg system. Such intermetallic compounds mainly composed of Fe and Al are called Fe-based compounds in this specification. This intermetallic compound contributes to refinement of crystal grains and improves tensile strength. If the Fe content is less than 0.01% by mass, these functions and effects are insufficient, and if the Fe content exceeds 2.00% by mass, crystallized substances increase and the workability decreases. . Here, the term "crystallized substance" refers to an intermetallic compound that is produced during casting and solidification of the alloy. Therefore, the Fe content is 0.01 to 2.00% by mass, preferably 0.05 to 0.28% by mass, more preferably 0.05 to 0.23% by mass. If the cooling rate during casting is slow, the dispersion of the Fe-based compound becomes sparse, increasing the degree of adverse effects.

In addition, the aluminum alloy material constituting the metal material 1 contains 0.10% by mass or more and 1.80% by mass or less of magnesium, 0.20% by mass or more and 2.10% by mass or less of silicon, and 0.01% by mass of iron. 2.00% by mass or less, and at least one component selected from the group consisting of titanium, boron, copper, silver, zinc, nickel, cobalt, gold, manganese, chromium, vanadium, zirconium and tin 0.02% by mass or more and 2.00% by mass or less in total, with the balance being aluminum and inevitable impurities.

<At least one component selected from the group consisting of rare earth elements, titanium, boron, copper, silver, zinc, nickel, cobalt, gold, manganese, chromium, vanadium, zirconium and tin: 0.02% by mass or more in total 2.00% or less>
RE (rare earth element), Cu (copper), Ag (silver), Zn (zinc), Ni (nickel), Co (cobalt), Au (gold), Mn (manganese), Cr (chromium), V (vanadium) , Zr (zirconium), Sn (tin), Ti (titanium), and B (boron) all refine the crystal grains during casting, reduce the number of specific voids, and further improve strength and heat resistance. It is an element that improves the quality, and can be appropriately added as an optional additive component as needed. Mechanisms by which these components improve the heat resistance include, for example, a mechanism by which the energy of the grain boundary is reduced due to a large difference between the atomic radii of the above components and the atomic radius of aluminum, and a mechanism by which the diffusion coefficient of the above components increases. A mechanism that reduces the mobility of the grain boundary when it enters the grain boundary due to its large size, a mechanism that has a large interaction with the vacancy and traps the vacancy, and a mechanism that delays the diffusion phenomenon. It is thought that they act synergistically. In addition, RE means a rare earth element, and includes 17 kinds of elements such as lanthanum, cerium, and yttrium, and these 17 kinds of elements have the same effect, and it is chemically difficult to extract a single element. , is defined as the total amount in the present invention.

RE, B, Cu, Ag, Zn, Ni, Ti, Co, Au, Mn, Cr, V, Zr, and Sn are all elements that particularly improve heat resistance. From the viewpoint of sufficiently exhibiting such effects, the total content of these optional additive components is preferably 0.02% by mass or more. However, if the total content of these components exceeds 2.00% by mass, workability may deteriorate. Therefore, when containing one or more selected from the group consisting of RE, Cu, Ag, Zn, Ni, Co, Au, Mn, Cr, V, Zr, Sn, Ti and B, their content is 2.00% by mass or less, preferably 0.06 to 2.00% by mass, more preferably 0.30 to 1.20% by mass. These components may be contained singly or in combination of two or more. In particular, it is preferable to contain one or more selected from Zn, Ni, Co, Mn, Cr, V, Zr, Sn, Ti and B in consideration of corrosion resistance when used in a corrosive environment.

<Ti: 0.00% by mass or more and 2.00% by mass or less>
Ti is an element that has the effects of refining crystal grains during casting, reducing the number of specific voids, and improving heat resistance and corrosion resistance when used in a corrosive environment. The Ti content is preferably 0.005% by mass or more in order to make crystal grains finer during casting and to sufficiently exhibit the effect of improving heat resistance. In addition, in order to fully exhibit the effect of improving corrosion resistance when used in a corrosive environment, the Ti content is more preferably 0.06% by mass or more, and more preferably 0.30% by mass or more. It is more preferable that On the other hand, when the Ti content exceeds 2.000% by mass, the workability deteriorates. Therefore, the Ti content is preferably 2.000% by mass or less, more preferably 1.500% by mass or less, and even more preferably 1.200% by mass or less. In addition, since Ti is an optional additive element component, when Ti is not added, the lower limit of the Ti content is set to 0.00% by mass in consideration of the impurity level.

<B: 0.00% by mass or more and 2.00% by mass or less>
B is an element that has the effect of refining crystal grains during casting, reducing the number of specific voids, and improving heat resistance and corrosion resistance when used in a corrosive environment. The content of B is preferably 0.005% by mass or more in order to make crystal grains finer during casting and to sufficiently exhibit the effect of improving heat resistance. In addition to this, in order to sufficiently exhibit the effect of improving corrosion resistance when used in a corrosive environment, the content of B is more preferably 0.06% by mass or more, and 0.30% by mass or more. It is more preferable that On the other hand, when the content of B exceeds 2.000% by mass, the workability deteriorates. Therefore, the B content is preferably 2.000% by mass or less, more preferably 1.500% by mass or less, and even more preferably 1.200% by mass or less. Since B is an optional additive element component, when B is not added, the lower limit of the B content is set to 0.00% by mass in consideration of the impurity level.

<Cu: 0.00% by mass or more and 2.00% by mass or less>
Cu is an element that has the effects of refining crystal grains during casting, reducing the number of specific voids, and improving heat resistance. In order to sufficiently exhibit such effects, the Cu content is preferably 0.02% by mass or more, more preferably 0.30% by mass or more. On the other hand, when the Cu content exceeds 2.00% by mass, the workability is lowered and the corrosion resistance is lowered. Therefore, the Cu content is preferably 2.00% by mass or less, more preferably 1.50% by mass or less, and even more preferably 1.20% by mass or less. In addition, since Cu is an optional additive element component, when Cu is not added, the lower limit of the Cu content is set to 0.00% by mass in consideration of the impurity level.

<Ag: 0.00% by mass or more and 2.00% by mass or less>
Ag is an element that has the effects of refining crystal grains during casting, reducing the number of specific voids, and improving heat resistance. In order to sufficiently exhibit such effects, the Ag content is preferably 0.02% by mass or more, more preferably 0.30% by mass or more. On the other hand, when the Ag content exceeds 2.00% by mass, the workability deteriorates. Therefore, the Ag content is preferably 2.00% by mass or less, more preferably 1.50% by mass or less, and even more preferably 1.20% by mass or less. Since Ag is an optional additive element component, when Ag is not added, the lower limit of the Ag content is set to 0.00% by mass in consideration of the impurity level.

<Zn: 0.00% by mass or more and 2.00% by mass or less>
Zn is an element that has the effects of refining crystal grains during casting, reducing the number of specific voids, and improving heat resistance and corrosion resistance when used in a corrosive environment. In order to sufficiently exhibit such effects, the Zn content is preferably 0.02% by mass or more, more preferably 0.30% by mass or more. On the other hand, if the Zn content exceeds 2.00% by mass, the workability deteriorates. Therefore, the Zn content is preferably 2.00% by mass or less, more preferably 1.50% by mass or less, and even more preferably 1.20% by mass or less. Note that Zn is an optional additive element component, so when Zn is not added, the lower limit of the Zn content is set to 0.00% by mass in consideration of the impurity level.

<Ni: 0.00% by mass or more and 2.00% by mass or less>
Ni is an element that has the effects of refining crystal grains during casting, reducing the number of specific voids, and improving heat resistance and corrosion resistance when used in a corrosive environment. From the viewpoint of sufficiently exhibiting such effects, the Ni content is preferably 0.02% by mass or more, more preferably 0.30% by mass or more. On the other hand, when the Ni content exceeds 2.00% by mass, the workability deteriorates. Therefore, the Ni content is preferably 2.00% by mass or less, more preferably 1.50% by mass or less, and even more preferably 1.20% by mass or less. In addition, since Ni is an optional additive element component, when Ni is not added, the lower limit of the Ni content is set to 0.00% by mass in consideration of the impurity level.

<Co: 0.00% by mass or more and 2.00% by mass or less>
Co is an element that has the effects of refining crystal grains during casting, reducing the number of specific voids, and improving heat resistance and corrosion resistance when used in a corrosive environment. In order to sufficiently exhibit such effects, the Co content is preferably 0.02% by mass or more, more preferably 0.30% by mass or more. On the other hand, when the Co content exceeds 2.00% by mass, the workability deteriorates. Therefore, the Co content is preferably 2.00% by mass or less, more preferably 1.50% by mass or less, and even more preferably 1.20% by mass or less. Since Co is an optional additive element, when Co is not added, the lower limit of the Co content is set to 0.00% by mass in consideration of the impurity level.

<Au: 0.00% by mass or more and 2.00% by mass or less>
Au is an element that has the effects of refining crystal grains during casting, reducing the number of specific voids, and improving heat resistance. In order to sufficiently exhibit such effects, the Au content is preferably 0.02% by mass or more, more preferably 0.30% by mass or more. On the other hand, when the content of Au exceeds 2.00% by mass, workability is lowered. Therefore, the Au content is preferably 2.00% by mass or less, more preferably 1.50% by mass or less, and even more preferably 1.20% by mass or less. In addition, since Au is an optional additive element component, when not adding Au, the lower limit of the Au content is set to 0.00% by mass in consideration of the impurity level.

<Mn: 0.00% by mass or more and 2.00% by mass or less>
Mn is an element that has the effect of refining crystal grains during casting, reducing the number of specific voids, and improving heat resistance and corrosion resistance when used in a corrosive environment. In order to sufficiently exhibit such effects, the Mn content is preferably 0.02% by mass or more, more preferably 0.30% by mass or more. On the other hand, if the Mn content exceeds 2.00% by mass, the workability is lowered. Therefore, the Mn content is preferably 2.00% by mass or less, more preferably 1.50% by mass or less, and even more preferably 1.20% by mass or less. Since Mn is an optional additive element component, when Mn is not added, the lower limit of the Mn content is set to 0.00% by mass in consideration of the impurity level.

<Cr: 0.00% by mass or more and 2.00% by mass or less>
Cr is an element that has the effect of refining crystal grains during casting, reducing the number of specific voids, and improving heat resistance and corrosion resistance when used in a corrosive environment. In order to sufficiently exhibit such effects, the Cr content is preferably 0.02% by mass or more, more preferably 0.30% by mass or more. On the other hand, when the Cr content exceeds 2.00% by mass, the workability deteriorates. Therefore, the Cr content is preferably 2.00% by mass or less, more preferably 1.50% by mass or less, and even more preferably 1.20% by mass or less. Since Cr is an optional additive element component, the lower limit of the Cr content is set to 0.00% by mass in consideration of the content of impurities when Cr is not added.

<V: 0.00% by mass or more and 2.00% by mass or less>
V is an element that has the effect of refining crystal grains during casting, reducing the number of specific voids, and improving heat resistance and corrosion resistance when used in a corrosive environment. In order to sufficiently exhibit such effects, the V content is preferably 0.02% by mass or more, more preferably 0.30% by mass or more. On the other hand, when the V content exceeds 2.00% by mass, the workability deteriorates. Therefore, the V content is preferably 2.00% by mass or less, more preferably 1.50% by mass or less, and even more preferably 1.20% by mass or less. Since V is an optional additive element component, when V is not added, the lower limit of the V content is set to 0.00% by mass in consideration of the impurity level.

<Zr: 0.00% by mass or more and 2.00% by mass or less>
Zr is an element that has the effect of refining crystal grains during casting, reducing the number of specific voids, and improving heat resistance and corrosion resistance when used in a corrosive environment. In order to sufficiently exhibit such effects, the Zr content is preferably 0.02% by mass or more, more preferably 0.30% by mass or more. On the other hand, if the Zr content exceeds 2.00% by mass, the workability deteriorates. Therefore, the Zr content is preferably 2.00% by mass or less, more preferably 1.50% by mass or less, and even more preferably 1.20% by mass or less. Since Zr is an optional additive element component, when Zr is not added, the lower limit of the Zr content is set to 0.00% by mass in consideration of the impurity level.

<Sn: 0.00% by mass or more and 2.00% by mass or less>
Sn is an element that has the effects of refining crystal grains during casting, reducing the number of specific voids, and improving heat resistance and corrosion resistance when used in a corrosive environment. In order to sufficiently exhibit such effects, the Sn content is preferably 0.02% by mass or more, more preferably 0.30% by mass or more. On the other hand, when the Sn content exceeds 2.00% by mass, the workability deteriorates. Therefore, the Sn content is preferably 2.00% by mass or less, more preferably 1.50% by mass or less, and even more preferably 1.20% by mass or less. In addition, since Sn is an optional additive element component, when Sn is not added, the lower limit of the Sn content is set to 0.00% by mass in consideration of the impurity level.

<Remainder: aluminum and inevitable impurities>
The balance other than the components mentioned above is Al and unavoidable impurities. The unavoidable impurities referred to here mean impurities at a content level that can be unavoidably included in the manufacturing process. Inevitable impurities can also be a factor that reduces the electrical conductivity of aluminum alloys, depending on their content. Therefore, it is preferable to suppress the content of inevitable impurities to some extent in consideration of the decrease in the electrical conductivity of the aluminum alloy due to the inevitable impurities. Examples of unavoidable impurities include Bi (bismuth), Pb (lead), Ga (gallium), and Sr (strontium). The content of each of these elements is preferably 0.05% by mass or less for each element, and 0.15% by mass or less in total for each element.

In addition, the metal material 1 of the present embodiment is used to form the foil thread 3 by spirally winding it around a core material, particularly a core material 2 having a relatively small outer diameter (for example, 1.0 mm or less). It is a metal material 1 that is For this reason, the metal material 1 has an average thickness of 0.005 mm or more and 0.500 mm or less, an average width of 0.10 mm or more and 2.00 mm or less, and a cross-sectional area when measured in the width direction cross section is It is preferably 0.80 mm ² or less.

Since the foil yarn 3 of the embodiment of the present invention is assumed to have a small outer diameter, for example, 1.0 mm or less, the influence of the metal material 1 on the dimensions of the foil yarn 3 is minimized, In addition, it is necessary to ensure the bending characteristics of the metal material 1, that is, the easiness of winding. Based on these, in the embodiment of the present invention, the cross-sectional area of the metal material 1 is preferably 0.8 mm ² or less. Although the lower limit of the cross-sectional area of the metal material 1 is not particularly limited, it is set to 0.001 mm ² or more in consideration of winding without breakage during manufacturing of the foil yarn.

Moreover, since the metal material 1 of the present embodiment was developed as a metal material used to form the foil yarn 3, it is necessary to wind it around a core material mainly composed of fibers. The aluminum alloy material described in Patent Document 4 has a larger width and thickness than the metal material 1 of the present embodiment. It is necessary to specify the width and thickness of the foil based on assumptions. The metal material 1 of the present embodiment was developed on the assumption that the foil thread 3 having a small outer diameter is formed, and the range of the thickness t and the width W of the metal material 1 is defined. . Specifically, the average thickness t of the metal material 1 is preferably 0.005 mm or more and 0.500 mm or less, and more preferably 0.005 mm or more and 0.250 mm or less. Also, the average width W is preferably 0.10 mm or more and 2.00 mm or less, and more preferably 0.10 mm or more and 1.0 mm or less. Note that the width W, thickness t, cross-sectional area, etc. of the metal material 1 can be calculated based on the captured image after photographing the cross section of the metal material 1 with, for example, an optical microscope or an electron microscope.

Since both ends of the metal material 1 have convex curved surfaces, the width W and the thickness t are measured at five points in the longitudinal direction of the metal material 1 at intervals of 2.00 mm, and the arithmetic mean value thereof is taken as the above width. It is described as W and thickness t. Specifically, the "average thickness" is obtained by summing the thickness t1 of the central portion 4 and the thickness t2 of each of the end portions 5, dividing the total value by those numbers, and obtaining the arithmetic mean value. It means the average value of 5 points in the longitudinal direction. Also, the "average width" means the average value of the width W at five points in the longitudinal direction.

In the metal material 1 of the present embodiment, the ratio of the thickness t1 of the widthwise central portion 4 to the thickness t2 of the widthwise end portion 5 (t1/t2 ratio) is in the range of 1.05 or more and 1.20 or less. is set to be If the average width W is less than 0.10 mm, the amount of winding of the metal material 1 around the core material 2 per unit length increases, and the weight and material cost of the foil yarn 3 per unit length increase. On the other hand, when the average width W is wider than 2.00 mm, when the foil yarn 3 is bent, the metal material 1 wound around the core material 2 is likely to be bent. 1 may suffer from so-called bending cracks.

Furthermore, the metal material 1 according to the embodiment of the present invention preferably has a Vickers hardness HV of 90 or more and 250 or less. Generally, the Vickers hardness has a substantially proportional relationship with the tensile strength, and a predetermined tension is applied to the metal material 1 during wire drawing or in a forming process in which the metal material 1 is wound around the core material 2 to form the foil thread 3. Therefore, the Vickers hardness is preferably 90 or more so as not to break due to the tension. A Vickers hardness of 90 is equivalent to that of a copper-based material and an iron-based material. Therefore, the metal material 1 according to the embodiment of the present invention has hardness equal to or greater than that of the copper-based material and the iron-based material. The Vickers hardness of the metal material 1 is preferably 105 or higher, more preferably 115 or higher, even more preferably 130 or higher, still more preferably 150 or higher, and 220 or higher. Most preferably there is. Also, if the Vickers hardness exceeds 250, so-called unwinding may occur when winding onto a bobbin or the like, making winding difficult. The Vickers hardness is measured according to the method specified in JIS Z2244-1:2020, and the tensile strength is measured according to the method specified in JIS Z2241:2011.

Also, the ratio of the outer diameter D of the core material 2 to the thickness t of the metal material 1 (D/t ratio) is set to a value greater than 1.0. When the D/t ratio is 1.0 or less, when the metal material 1 is wound around the core material 2, the metal material at the portion where the metal material 1 is wound around the core material 2 (hereinafter referred to as a bent portion) The bending diameter of 1 becomes smaller. Therefore, the strain generated in the metal material 1 at the bent portion is increased. In that case, a shear band or a bending crack may occur at the bent portion, which may become a starting point of fracture, so this is to be avoided.

[Core material]
Next, the core material 2 constituting the foil yarn 3 of the present invention will be described. The metal material 1 is wound around the core material 2, and the core material 2 is formed by bundling or twisting a plurality of fibers made of, for example, a synthetic resin material. and hollow lines. Examples of synthetic resin materials include polyolefin-based resins such as polyethylene and polypropylene, polyester-based resins, and polyurethane-based resins. Alternatively, the core material 2 may be composed of high-strength fibers such as Kevlar (registered trademark) and Zylon (registered trademark), or fibers made of a resin that is cured or modified by heat or ultraviolet rays. Alternatively, the core material 2 may be formed by impregnating filamentous or linear fibers with a thermosetting resin, a thermoplastic resin, or the like. Furthermore, it may be solder, flux, or the like formed into a thread shape. In short, the core material 2 may be formed in a thread-like or linear shape around which the metal material 1 is wound, and the material constituting the core material 2 is not particularly limited. For example, when the average width W of the metal material 1 is set to 0.10 mm or more and 2.00 mm or less, the outer diameter D of the core material 2 has a W/D ratio of more than 0.5 and less than 5.0. Therefore, it is preferable to set the width to 0.02 mm or more and 4.0 mm or less.

[Foil thread]
Then, as shown in FIG. 3, the core member 2 constructed in this way is spirally formed so as to form gaps 6 at regular intervals in the length direction or axial direction of the core member 2 . A foil thread 3 is formed by winding a metal material 1. - 特許庁The gap 6 is a portion that bends when the foil yarn 3 is subjected to an external force that bends and deforms the foil yarn 3. The size or width of the gap 6 can be determined in advance by experiments. In addition, this makes it possible to reduce the amount of winding of the metal material 1 around the core material 2, thereby reducing the weight of the foil yarn 3 per unit length, as well as reducing the material cost.

Therefore, according to the embodiment of the present invention, since the aluminum or aluminum alloy constituting the metal material 1 is processed to a large extent, the strength of the ribbon-shaped metal material 1 is made of a copper-based material, an iron-based material, or the like. It can be made to be approximately the same as the metal material for foil thread having a ribbon shape. In addition, as shown in FIG. 4, the metal material 1 has a ratio (t1/t2 ratio) of the thickness t1 of the center portion 4 to the thickness t2 of the both end portions 5 in the range of 1.05 or more to 1.20 or less. Therefore, contact between the core material 2 and both end faces can be suppressed when the foil yarn 3 is produced by spirally winding it around the core material 2 . Therefore, when the metal material 1 is wound around the core material 2, it is possible to suppress concentration of stress on both end surfaces, thereby preventing or suppressing damage to the metal material 1. FIG.

Furthermore, since the W/D ratio is more than 0.5 and less than 5.0, it is possible to prevent or suppress an excessive increase in the amount of winding of the metal material 1 around the core material 2 . As a result, it is possible to prevent or suppress an increase in the weight of the foil thread 3 per unit length and the material cost. In addition, when the metal material 1 is wound around the core material 2, the so-called bending diameter of the metal material 1 can be prevented or suppressed from becoming excessively small. It is possible to prevent or suppress the occurrence of so-called bending cracks. Furthermore, when the foil thread 3 is bent, the bending occurs mainly in the gap 6 described above, so bending of the metal material 1 wound around the core material 2 can be prevented or suppressed. As a result, it is possible to obtain the foil yarn 3 which is less likely to be damaged even if it is bent and deformed by repeatedly applying an external force, and which is light in weight and low in material cost.

[Manufacturing method of metal material 1]
A method for manufacturing the metal material 1 according to the embodiment of the present invention will be described. In the embodiment of the present invention, a wire-shaped material for processing, that is, a rough wire composed of pure aluminum or an aluminum alloy having the above-described alloy composition is prepared, and the rough wire is subjected to wire drawing and rolling. to manufacture the metal material 1. The aluminum alloy forming the rough wire is not particularly limited as long as it has the above alloy composition. That is, the rough wire may be, for example, extruded material, ingot material, hot rolled material, cold rolled material, or the like. A fine wire having a predetermined thickness is formed by drawing the rough wire. The wire drawing process may be, for example, a conventionally known wire drawing process called drawing, or a wire drawing process using a deformed die. In addition, in the method for manufacturing the metal material 1 according to the embodiment of the present invention, the aging precipitation heat treatment that is conventionally performed before wire drawing is not performed.

The working degree η of wire drawing is preferably 5 or more, more preferably 6 or more, and even more preferably 7 or more. Although the upper limit of the workability η is not particularly defined, it is usually 15. The workability η is a logarithmic ratio of the cross-sectional area s1 (s1>s2) of the rough wire before drawing to the cross-sectional area s2 of the rough wire after drawing. 1).
Workability η (dimensionless) = ln (s1/s2) (1)

In addition, in the method for manufacturing the metal material 1 according to the embodiment of the present invention, the working rate R of wire drawing is preferably 98.2% or more, more preferably 99.8% or more. The processing rate R can be expressed by the following formula (2) based on the cross-sectional areas s1 and s2 described above.
Processing rate R (%) = {(s1-s2)/s1} x 100 (2)

Next, the thin wire formed by wire drawing is rolled into the ribbon shape described above. The rolling process may be conventionally known roll rolling, flat wire rolling, or satellite mill rolling. is 1.05 times or more and 1.20 times or less as described above. A ratio of t1/t2 of the thickness t1 of the central portion 4 to the thickness t2 of the end portion 5 is preferably 1.05 times or more in terms of rolling to prevent defects such as cracks during rolling. The difference between the thickness t1 of the central portion 4 and the thickness t2 of the end portion 5 can be adjusted, for example, by appropriately changing the shape of the rolling rolls for crushing the fine wire. Specifically, the portion of the rolling roll that forms the central portion 4 is recessed with respect to the portion that forms the end portion 5 . Alternatively, when the fine wire is passed between a pair of rolls and crushed, pressure is applied to both sides of the fine wire with the central portion of the fine wire sandwiched therebetween in the radial direction of the fine wire, rather than to the central portion. By doing so, it is possible to configure the metal material 1 in which the central portion 4 is thicker than the end portions 5 in the cross-sectional views shown in FIGS. 1 and 4 .

In the above-described rolling process, the width expansion ratio S is preferably 1.4 or more and 6.0 or less, more preferably 1.7 or more and 5.0 or less, and 2.0 or more and 4.0 or less. more preferably, and most preferably 2.3 or more and 3.5 or less. The width expansion ratio S can be expressed by the following formula (3), where W ₁ is the diameter of the thin wire after wire drawing, and W ₂ is the width of the ribbon-shaped thin wire after rolling.
Width expansion ratio S=W ₂ /W ₁ (3)

Wire drawing may be performed after rolling. In short, the t1/t2 ratio (t1/t2) of the thickness t1 of the central portion 4 to the thickness t2 of the end portions 5 of the metal material 1 is within the range described above, and the ribbon shape of a predetermined thickness or width is obtained. It suffices if a thin wire having a Furthermore, for the purpose of releasing residual stress and improving elongation, refining annealing may be performed after rolling or wire drawing. The temper annealing is preferably performed at a treatment temperature of 50° C. or higher and 160° C. or lower for a holding time of 1 hour or longer and 48 hours or shorter. When the treatment temperature is less than 50°C, it is difficult to obtain the effects of releasing residual stress and improving elongation. . The conditions for such heat treatment can be appropriately adjusted depending on the type and amount of inevitable impurities and the solid solution/precipitation state of the aluminum alloy material used.

In the embodiment of the present invention, as described above, the rough wire is processed with a high degree of processing. As a result, a high-strength metal material 1 having a long ribbon shape can be obtained. The length of the metal material 1 is at least 10 m or longer. Although the upper limit of the length of the metal material 1 at the time of manufacture is not particularly set, it is preferable to set it to about 6000 m in consideration of workability and the like.

[Use]
The metal material 1 and the foil yarn 3 according to the embodiment of the present invention have approximately the same strength as the ribbon-shaped foil yarn metal material and foil yarn made of a copper-based material, an iron-based material, or the like. Therefore, it can be used in place of the foil thread metal material and the foil thread made of copper-based materials, iron-based materials, and the like. Specifically, for example, a twisted yarn or twisted wire configured by twisting at least two or more foil yarns 3, or a cloth configured by combining or knitting a plurality of foil yarns 3, etc. can be done. It can also be used for clothing-type heaters, sensors attached to clothing, and wearable devices such as cameras. Furthermore, the foil thread 3 in the embodiment of the present invention is a conductive member such as an electric wire or cable, a conductive material such as an aluminum conductor or a laying wire, a shield material, a wearable product, a winding wire such as a motor, a linear magnet, or a myoelectric prosthetic hand. It can be used for myoelectric prostheses, prepregs, tinsel wires, and the like.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and includes various aspects within the scope of the present invention, including all aspects included in the concept of the present invention and the scope of claims. can be modified to

[Example]
EXAMPLES The present invention will be described below based on examples.
(Examples 1 to 6 and Comparative Examples 1 to 6)
A rough wire of aluminum or aluminum alloy having the alloy composition shown in Table 1 is prepared, and using this, the above-described wire drawing or rolling is performed to obtain the t1/t2 ratio and average thickness shown in Table 1. A ribbon-shaped metal material 1 having t, average width W, cross-sectional area S, tensile strength and Vickers hardness was produced. Then, a metal material 1 was spirally wound around a core material 2 made of aramid fibers having an outer diameter of 0.06 mm as shown in FIG.

[Performance evaluation method]
<Evaluation method for the presence or absence of line breakage>
The presence or absence of wire breakage was evaluated by observing whether or not breakage occurred in the metal material 1 when the foil thread 3 was produced.

<Method for evaluating the presence or absence of shear bands>
The surface of the metal material 1 wound around the core material 2 was observed with an optical microscope or an electron microscope at a magnification of about 300 times to evaluate the presence or absence of shear band formation.

[evaluation]
As shown in Table 1, in any of Examples 1 to 6, no line breakage or shear band formation was observed in the metal material 1 constituting the foil yarn 3 .

On the other hand, in Comparative Examples 1 and 2, since the tensile strength was out of the proper range of the present invention, line breakage occurred in the metal material 1 .

In Comparative Examples 3 and 4, the t1/t2 ratio and the tensile strength were out of the appropriate ranges of the present invention, so wire breakage occurred in the metal material 1 .

In Comparative Example 5, since the t1/t2 ratio was larger than the appropriate range of the present invention, not only line breakage occurred in metal material 1 but also shear bands were formed. In Comparative Example 3, as in Comparative Example 5, the t1/t2 ratio was larger than the appropriate range of the present invention, but the tensile strength was smaller and softer than the appropriate range of the present invention. never formed.

In Comparative Example 6, since the t1/t2 ratio was smaller than the appropriate range of the present invention, wire breakage occurred in the metal material 1.

REFERENCE SIGNS LIST 1 metal material 2 core material 3 foil thread 4 widthwise center portion 5 widthwise end portion 6 gap

Claims (8)

A foil yarn metal material having a ribbon shape that is spirally wound around a thread-like core material to form a foil yarn,
The metal material is
made of aluminum or an aluminum alloy,
The cross section in the width direction of the metal material has a substantially rectangular shape, and
When viewed in cross section in the width direction of the metal material, the thickness of the central portion in the width direction is 1.05 to 1.20 times the thickness of the end portions in the width direction,
A metal material for foil thread, characterized by having a tensile strength of 270 MPa or more and 750 MPa or less. The aluminum alloy contains 0.10% by mass or more and 1.80% by mass or less of magnesium, 0.20% by mass or more and 2.10% by mass or less of silicon, and 0.01% by mass or more and 2.00% by mass or less of iron. 2. The metal material for foil yarn according to claim 1, having an alloy composition containing aluminum and the balance being aluminum and inevitable impurities. The aluminum alloy contains 0.10% by mass or more and 1.80% by mass or less of magnesium, 0.20% by mass or more and 2.10% by mass or less of silicon, and 0.01% by mass or more and 2.00% by mass or less of iron. 0.02% by mass in total of at least one component selected from the group consisting of titanium, boron, copper, silver, zinc, nickel, cobalt, gold, manganese, chromium, vanadium, zirconium and tin 2. The metal material for foil yarn according to claim 1, having an alloy composition containing at least 2.00% by weight and the balance being aluminum and inevitable impurities. The metal material is
an average thickness of 0.005 mm or more and 0.500 mm or less;
The average width is 0.10 mm or more and 2.00 mm or less, and
The metal material for foil yarn according to any one of claims 1 to 3, wherein the cross-sectional area when measured in the cross section in the width direction is 0.80 ^mm2 or less. A foil yarn configured by spirally winding the metal material for foil yarn according to any one of claims 1 to 4 around the core material. The foil yarn according to claim 5, wherein the ratio (W/D) of the width (W) of the metal material to the outer diameter (D) of the core material is more than 0.5 and less than 5.0. A twisted yarn formed by twisting at least two foil yarns according to claim 6. A cloth formed by combining a plurality of foil yarns according to claim 6.

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