KR20250097314A - Manufacturing method aluminum alloy extruded material and aluminum alloy extruded material manufacturd by the same - Google Patents

Abstract

The present invention provides a method for manufacturing an aluminum extrusion and an aluminum extrusion manufactured thereby. One aspect of the method for manufacturing an aluminum extrusion according to an embodiment of the present invention includes a filling step in which a reinforcing material formed with a material having a tensile strength exceeding that of aluminum and having a preset length is filled into a filling space defined inside a hollow base member formed with an aluminum material; a heating step in which the base member is heated; and an extrusion step in which the base member is extruded; wherein, in the extrusion step, the reinforcing material is arranged in the longitudinal direction of the base member.

Description

{MANUFACTURING METHOD ALUMINUM ALLOY EXTRUDED MATERIAL AND ALUMINUM ALLOY EXTRUDED MATERIAL MANUFACTURD BY THE SAME}

The present invention relates to a method for manufacturing an aluminum extrusion and an aluminum extrusion manufactured thereby.

Aluminum is a non-ferrous metal with excellent electrical conductivity, and is commonly used as a conductor for power lines such as electric wires and transmission lines. On the other hand, due to the relatively low tensile strength and high elongation of aluminum, separate tensile materials are added to reinforce the tensile strength when used as power lines.

For example, a tensile core made of reinforcing fibers, such as carbon fibers, which have relatively high tensile strength, is placed inside an aluminum conductor, and the tensile stress caused by an external force is borne by the tensile core. In this case, when the tensile core is placed inside an aluminum conductor, not only must the tensile core be manufactured separately, but a process of winding (stranding) the aluminum conductor to surround the tensile core must also be added.

Meanwhile, a technology for forming aluminum with reinforcing fibers added thereto in order to secure the tensile strength of the aluminum itself has been proposed. In Japanese Patent No. 7342881, an aluminum alloy containing pure aluminum and magnesium is formed into a foil shape, and then carbon particles are applied to the surface of the foil, and the foils are laminated multiple times to manufacture an aluminum-carbon composite material. In addition, in Korean Patent No. 2324737, magnesium powder is attached to carbon fibers coated with silicon oxide (SiO2), aluminum powder is mixed therewith, and the mixture is reacted and melted at a temperature of 700 to 850°C, thereby impregnating the metal matrix with carbon fibers. Since aluminum composite materials containing carbon for reinforcing the tensile strength by conventional techniques are manufactured through a cumbersome process, an alternative is required to solve this problem.

Republic of Korea Patent No. 10-1046215 (Title: Aluminum conductor composite core reinforced cable and its manufacturing method) Japanese Publication Patent No. 1994-020522 (Title: Carbon Fiber Wire) Japanese Patent No. 7342881 (Title: Aluminum-carbon particle composite and method for producing the same) Korean Patent No. 2324737 (Title: Method for producing small fiber reinforced metal composite and carbon fiber reinforced aluminum composite produced therefrom)

The present invention is intended to solve the problems of the prior art as described above, and an object of the present invention is to provide a method for manufacturing an aluminum extrusion having tensile strength reinforced by carbon fibers that can be manufactured more easily, and an aluminum extrusion manufactured thereby.

One aspect of a method for manufacturing an aluminum extrusion according to an embodiment of the present invention for achieving the above-described object includes a filling step in which a reinforcing material formed with a tensile strength exceeding that of aluminum and having a preset length is filled into a filling space defined inside a hollow base member formed with an aluminum material; a heating step in which the base member is heated; and an extrusion step in which the base member is extruded; wherein, in the extrusion step, the reinforcing material is arranged in the longitudinal direction of the base member.

In one embodiment of the present invention, in the filling step, aluminum powder made of aluminum material is filled into the filling space together with the reinforcing material.

In one embodiment of the present invention, the reinforcing material is formed of a material selected from the group consisting of graphite, graphene, and carbon, and the aluminum powder is made of aluminum having an electrical conductivity exceeding that of the aluminum forming the base member.

In one embodiment of the present invention, the volume ratio of the reinforcing material and aluminum powder filled in the filling space is 10:90 to 30:70.

In one aspect of an embodiment of the present invention, the invention further includes a first shielding step in which a first cap member made of aluminum is coupled to a first end of the base member before performing the filling step to shield a first end of the filling space; and a second shielding step in which a second cap member made of aluminum is coupled to a second end of the base member after performing the filling step to shield a second end of the filling space; wherein the first and second cap members are separated from the base member before or during the extrusion step.

One embodiment of an aluminum extrusion material according to an embodiment of the present invention is manufactured by the method for manufacturing an aluminum extrusion material according to any one of claims 1 to 5.

Another aspect of an aluminum extrusion according to an embodiment of the present invention comprises: a hollow base member formed of aluminum material and defining a filling space therein; and a plurality of reinforcing materials formed of a material having a tensile strength exceeding that of aluminum and having a preset length and filled in the filling space; wherein, during a process in which the base member filled with the reinforcing materials filled in the filling space is hot-extruded, the reinforcing materials are arranged in the longitudinal direction of the base member.

In another aspect of the embodiment of the present invention, the present invention further includes aluminum powder made of aluminum material filled in the filling space together with the reinforcing material.

In another aspect of the embodiment of the present invention, the reinforcing material is formed of a material selected from the group consisting of graphite, graphene and carbon, and the aluminum powder is made of aluminum having an electrical conductivity exceeding that of the aluminum forming the base member.

In another aspect of the embodiment of the present invention, the volume ratio of the reinforcing material and the aluminum powder filled in the filling space is 10:90 to 30:70.

In another aspect of the embodiment of the present invention, the invention further includes first and second cap members made of aluminum, which are respectively connected to the first and second ends of the base member to shield the first and second ends of the filling space, and are separated from the base member before or during extrusion of the base member.

In the method for manufacturing an aluminum extrusion according to the present invention and in the aluminum extrusion manufactured thereby, a filling space is formed inside a base member made of aluminum, and the tensile strength thereof is reinforced by a reinforcing material filled in the filling space. In particular, in the present embodiment, since aluminum powder is filled in the filling space together with the reinforcing material, the reinforcing material can be aligned in the longitudinal direction of the base member during the extrusion process of the base member. In addition, in the present embodiment, since the aluminum powder is formed with a relatively higher electrical conductivity than the aluminum that forms the base member, the electrical conductivity in a portion corresponding to the filling space can be relatively increased, and ultimately, the decrease in the electrical conductivity of the aluminum extrusion can be minimized. Therefore, according to the embodiment of the present invention, it is possible to manufacture an aluminum extrusion in which the tensile strength is increased while preventing a decrease in electrical conductivity in a simpler manner.

Figure 1 is an exploded perspective view showing the composition of an aluminum extrusion material according to an embodiment of the present invention.
Figure 2 is a cross-sectional view showing an embodiment of the present invention.
Figure 3 is a flow chart showing a method for manufacturing an aluminum extrusion material according to an embodiment of the present invention.
Figure 4 is a work diagram showing the steps of manufacturing an aluminum extrusion material in an embodiment of the present invention.

Hereinafter, an aluminum extrusion material according to an embodiment of the present invention will be described in more detail with reference to the attached drawings.

Referring to FIGS. 1 and 2, the aluminum extrusion (1) according to the present embodiment includes a base member (100), first and second cap members (210) (220), a reinforcing member (300), and aluminum powder (400). In particular, in the present embodiment, since the tensile strength of the aluminum extrusion (1) is improved by the reinforcing member (300), a separate member that bears tensile stress due to an external force can be eliminated.

More specifically, the base member (100) is formed of aluminum material and is hollow so that a filling space (100S) is defined therein. For example, the base member (100) can be formed of 1000 series aluminum, preferably 1060 aluminum. The filling space (100S) is where the reinforcing material (300) and aluminum powder (400) are filled.

And, first and second engaging grooves (111)(121) are formed on the inner circumferences of the first and second ends of the base member (100), respectively. The first and second engaging grooves (111)(121) are for fixing the first and second cap members (210)(220), and for example, the first and second engaging grooves (111)(121) may be formed by tapping after the base member (100) is cast.

The first and second cap members (210)(220) respectively shield the first and second ends of the filling space (100S). To this end, the first and second cap members (210)(220) are respectively coupled to the first and second ends of the base member (100). As described below, the first and second cap members (210)(220) are separated from the base member (100) before the extrusion of the base member (100) or during the extrusion process of the base member (100).

In addition, the first and second cap members (210)(220) are provided with first and second engaging projections (211)(221) that are inserted into the first and second engaging grooves (111)(121), respectively. In practice, when the first cap member (210) is coupled to the first end of the base member (100) and the reinforcing material (300) and powder are filled in the filling space (100S), the second cap member (220) can be coupled to the second end of the base member (100).

And the reinforcing material (300) is formed of a material having a tensile strength exceeding that of aluminum, for example, a material selected from the group consisting of graphite, graphene, and carbon, and is filled in the filling space (100S). The reinforcing material (300) serves to increase the tensile strength of the aluminum extruded material (1). In particular, in the present embodiment, the reinforcing material (300) is formed to a preset length, for example, a length of about 10 nm, and, as described below, is arranged in the longitudinal direction of the base member (100) during the process of extruding the base member (100).

Next, the aluminum powder (400) is filled in the filling space (100S) together with the reinforcing material (300) and is made of aluminum. In particular, in the present embodiment, the aluminum powder (400) is made of aluminum having an electrical conductivity exceeding that of the aluminum forming the base member (100). This is because the electrical conductivity of the portion corresponding to the filling space (100S) may be relatively lowered compared to other portions of the aluminum extrusion (1) due to the reinforcing material (300) being formed of a material selected from the group consisting of graphite, graphene, and carbon, which have significantly lower electrical conductivity than aluminum. In the present embodiment, in order to solve this problem, the aluminum powder (400) filled in the filling space (100S), that is, the aluminum powder (400) adjacent to the reinforcing material (300), is made of aluminum having an electrical conductivity exceeding that of the aluminum forming the base member (100). For example, the aluminum powder (400) can be made of other aluminum having an electrical conductivity of 1080 aluminum or higher.

In addition, in this embodiment, the volume ratio of the reinforcing material (300) and the aluminum powder (400) filled in the filling space (100S) is designed to be 10:90 to 30:70. This is to improve the tensile strength of the aluminum extruded material (1) while minimizing the decrease in electrical conductivity. That is, when the reinforcing material (300) is filled in the filling space (100S) in an amount such that the volume ratio of the reinforcing material to the aluminum powder (400) is less than 10:90, the decrease in electrical conductivity is improved, but the increase in the tensile strength is relatively insufficient. On the other hand, when the reinforcing material (300) is filled in the filling space (100S) in an amount exceeding 30:70 in volume ratio with respect to the aluminum powder (400), not only is the electrical conductivity excessively reduced, but also the alignment of the reinforcing material (300) in the longitudinal direction of the base member (100) during the extrusion process is difficult to achieve due to interference between them. Therefore, in the present embodiment, taking this into consideration, the volume ratio of the reinforcing material (300) and the aluminum powder (400) filled in the filling space (100S) is designed to be 10:90 to 30:70.

Hereinafter, a method for manufacturing an aluminum extrusion material according to an embodiment of the present invention will be described in more detail with reference to the attached drawings.

FIG. 3 is a flow chart showing a method for manufacturing an aluminum extrusion material according to an embodiment of the present invention, and FIG. 4 is a work diagram showing steps for manufacturing an aluminum extrusion material according to an embodiment of the present invention.

Referring to FIGS. 3 and 4, the method for manufacturing an aluminum extrusion material according to the present embodiment includes a first shielding step (S100), a filling step (S200), a second shielding step (S300), a heating step (S400), and an extrusion step (S500).

More specifically, referring to (A) of FIG. 4, in the first shielding step (S100), the first cap member (210) is coupled to the first end of the base member (100). Accordingly, the first end of the filling space (100S) is shielded by the first cap member (210). At this time, the base member (100) may have an inner diameter, an outer diameter, and a length of 20 mm, 40 mm, and 100 mm, respectively, and the diameter and thickness of the first and second cap members (210) (220) may be 20 mm and 5 mm, respectively.

And referring to (B) of FIG. 4, in the filling step (S200), the reinforcing material (300) and the aluminum powder (400) are filled in the filling space (100S). In particular, in the present embodiment, the reinforcing material (300) is formed of a material selected from the group consisting of graphite, graphene, and carbon, and the aluminum powder (400) is manufactured of aluminum having an electrical conductivity exceeding that of the aluminum forming the base member (100). And the volume ratio of the reinforcing material (300) and the aluminum powder (400) is filled in the filling space (100S) at 10:90 to 30:70. This is designed in consideration of the decrease in the electrical conductivity and the increase in the tensile strength of the aluminum extrusion material (1), as described above. Of course, in the filling step (S200), the reinforcing material (300) and aluminum powder (400) can be pressurized to remove the void after being filled in the filling space (100S).

Next, referring to (C) of FIG. 4, in the second shielding step (S300), the second cap member (220) is coupled to the second end of the base member (100). Accordingly, the second end of the filling space (100S) is shielded by the second cap member (220), so that the filling space (100S) is completely shielded from the outside.

Referring to (D) of FIG. 4, in the heating step (S400), the base member (100) can be heated at a preset temperature for a preset time, for example, at a temperature of 400° C. for 4 hours. In particular, in the present embodiment, in the heating step (S400), the base member (100) is heated while the filling space (100S) filled with the reinforcing material (300) and the aluminum powder (400) is shielded by the first and second cap members (210)(220), so that, during the heating process, in particular, the phenomenon of the aluminum powder (400) expanding and leaking out of the filling space (100S) can be prevented.

Finally, referring to (E) of Fig. 4, in the extrusion step (S500), the base member (100) is extruded to finally manufacture the aluminum extrusion material (1). For example, in the extrusion step (S500), the base member (100) is extruded through a 10 mm extrusion hole, and at this time, the base member (100) can be extruded at a speed of 15 mm/s.

In particular, in the present embodiment, in the extrusion step (500), the reinforcing material (300) is arranged in the longitudinal direction of the base member (100). This is possible because the filling space (100S) is not filled only with the reinforcing material (300), but, in fact, the aluminum powder (400) is filled in the filling space (100S) together with the reinforcing material (300), thereby ensuring fluidity so that the reinforcing material (300) can be arranged in the longitudinal direction of the base member (100) during the extrusion process. In addition, the first and second cap members (210)(220) may be separated from the base member (100) before the base member (100) is extruded in the extrusion step (S500), or the first and second cap members (210)(220) may be separated from the base member (100) during the process of extruding the base member (100) in the extrusion step (S500).

Hereinafter, the operation of the method for manufacturing an aluminum extrusion material according to an embodiment of the present invention will be described in more detail.

First, the conditions of <Manufacturing Examples 1> to <Manufacturing Examples 6> and <Comparative Examples 1> and <Comparative Examples 2> are as shown in [Table 1] below. Then, the inner diameter, outer diameter, and length of the base member (100) in <Manufacturing Examples 1> to <Manufacturing Examples 6> and <Comparative Examples 1> and <Comparative Examples 2> were set to 20 mm, 40 mm, and 100 mm, respectively, and the diameter and thickness of the first and second cap members (210)(220) were set to 20 mm and 5 mm, respectively. In addition, <Manufacturing Examples 1> to <Manufacturing Examples 6> and <Comparative Examples 1> and <Comparative Examples 2> were extruded while passing through a 10 mm extrusion hole (11) of an extrusion die (10) at an extrusion speed of 15 mm/s under temperature conditions of 390° C. after being preheated to a temperature of 400° C. for 4 hours.

Absence of base reinforcement Aluminum powder Volume ratio (reinforcement: aluminum powder)) Manufacturing example 1 Al 1060 carbon fiber Al 1060 10:90 Manufacturing example 2 Al 1060 carbon fiber Al 1060 25:75 Manufacturing example 3 Al 1060 carbon fiber Al 1060 40:60 Manufacturing example 4 Al 1060 carbon fiber Al 1080 10:90 Manufacturing example 5 Al 1060 carbon fiber Al 1080 25:75 Manufacturing example 6 Al 1060 carbon fiber Al 1080 40:60 Comparative Example 1 Al 1060 - - - Comparative Example 2 AL 1080 - - -

And the tensile strength and electrical conductivity of <Manufacturing Examples 1> to <Manufacturing Examples 6> and <Comparative Example 1> and <Comparative Example 2> are as shown in [Table 2] below. Referring to [Table 2], the tensile strength of <Manufacturing Examples 1>, <Manufacturing Examples 2>, <Manufacturing Examples 4> and <Manufacturing Examples 5> increases relatively compared to <Comparative Example 1> and <Comparative Example 2> due to the addition of the reinforcing material (300). Of course, since the reinforcing material (300) is selected from the group consisting of graphite, graphene, and carbon, which are materials having relatively low electrical conductivity compared to aluminum, <Manufacturing Example 1>, <Manufacturing Example 2>, <Manufacturing Example 4>, and <Manufacturing Example 5> may be disadvantageous in terms of electrical conductivity compared to <Comparative Example 1> and <Comparative Example 2>, but, for example, the electrical conductivity required for a transmission line exhibits a satisfactory value.

Tensile strength (MPa) Electrical Conductivity (%IACS) Manufacturing example 1 93 59.22 Manufacturing example 2 111 58.48 Manufacturing example 3 79 56.65 Manufacturing example 4 102 62.22 Manufacturing example 5 123 61.88 Manufacturing example 6 83 58.65 Comparative Example 1 91 62.01 Comparative Example 2 101 62.42

And, it can be confirmed that in <Manufacturing Example 1> and <Manufacturing Example 4>, where the volume ratio of the reinforcing material (300) and the aluminum powder (400) is 10:90, in <Manufacturing Example 2> and <Manufacturing Example 5>, where the volume ratio of the reinforcing material (300) and the aluminum powder (400) is 25:75, the tensile strength is significantly increased, but the decrease in electrical conductivity is minimal in comparison. On the other hand, in <Manufacturing Example 3> and <Manufacturing Example 6>, where the volume ratio of the reinforcing material (300) and the aluminum powder (400) is 40:60, not only is the electrical conductivity decreased compared to <Manufacturing Example 1>, <Manufacturing Example 2>, <Manufacturing Example 4> and <Manufacturing Example 5>, but also, despite the increase in the relative amount of the reinforcing material (300), it is confirmed that the tensile strength is disadvantageous. This is because the volume of the reinforcing material (300) is excessive compared to the total volume of the filling space (100S), and thus the arrangement of the reinforcing material (300) in the longitudinal direction of the base member (100) is not sufficiently achieved during the process of extruding the base member (100).

Within the scope of the basic technical idea of the present invention, many other modifications are possible for those skilled in the art, and the scope of the rights of the present invention should be interpreted based on the appended claims.

1; Aluminum extrusion 100: Base member
100S: Filling space 111, 121: First and second catch grooves
210, 220: First and second cap members 211, 221: First and second catch projections
300: Reinforcement 400: Aluminum powder

Claims (11)

A filling step (S200) in which a reinforcing material (300) formed with a predetermined length and made of a material having a tensile strength exceeding that of aluminum is filled into a filling space (100S) defined inside a hollow base member (100) formed of aluminum material;
The above base member (100) is heated in a heating step (S400); and
The above base member (100) includes an extrusion step (S500);
A method for manufacturing an aluminum extrusion material, wherein in the extrusion step (S500), the reinforcing material (300) is arranged in the longitudinal direction of the base member (100).
In paragraph 1,
In the above filling step (S200),
A method for manufacturing an aluminum extrusion material, wherein aluminum powder (400) made of aluminum material is filled into the filling space (100S) together with the above-mentioned reinforcing material (300).
In the second paragraph,
The above reinforcing material (300) is formed of a material selected from the group consisting of graphite, graphene and carbon,
A method for manufacturing an aluminum extrusion material, wherein the above aluminum powder (400) is manufactured from aluminum having an electrical conductivity exceeding that of the aluminum used to form the base member (100).
In the second paragraph,
A method for manufacturing an aluminum extrusion material, wherein the volume ratio of the reinforcing material (300) and the aluminum powder (400) filled in the filling space (100S) is 10:90 to 30:70.
In paragraph 1,
A first shielding step (S100) in which a first cap member (210) made of aluminum is connected to a first end of the base member (100) before performing the filling step (S200) to shield the first end of the filling space (100S); and
After the filling step (S200) is performed, a second cap member (220) made of aluminum is attached to the second end of the base member (100) to shield the second end of the filling space (100S), which further includes a second shielding step (S300);
A method for manufacturing an aluminum extrusion material, wherein the first and second cap members (210)(220) are separated from the base member (100) before or during the extrusion step (S500).
An aluminum extrusion manufactured by the method for manufacturing an aluminum extrusion according to any one of claims 1 to 5.
A hollow base member (100) formed of aluminum material and having a defined filling space (100S) therein; and
It includes a plurality of reinforcing materials (300) formed with a predetermined length and filled in the filling space (100S) with a material having a tensile strength exceeding that of aluminum;
An aluminum extrusion material in which the base member (100) filled with the reinforcing material (300) filled in the filling space (100S) is hot-extruded, and the reinforcing material (300) is arranged in the longitudinal direction of the base member (100).
In paragraph 7,
An aluminum extrusion further comprising aluminum powder (400) made of aluminum material, which is filled in the filling space (100S) together with the reinforcing material (300).
In Article 8,
The above reinforcing material (300) is formed of a material selected from the group consisting of graphite, graphene and carbon,
The above aluminum powder (400) is an aluminum extrusion material manufactured from aluminum having an electrical conductivity exceeding that of the aluminum used to form the base member (100).
In Article 8,
An aluminum extrusion material in which the volume ratio of the reinforcing material (300) and the aluminum powder (400) filled in the filling space (100S) is 10:90 to 30:70.
In paragraph 7,
An aluminum extrusion material further comprising first and second cap members (210)(220) made of aluminum, which are respectively connected to the first and second ends of the base member (100) to shield the first and second ends of the filling space (100S), and are separated from the base member (100) before or during extrusion of the base member (100).

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