KR20170114880A - Method of manufacturing aluminum middle frame for mobile electronic device and aluminum middle frame for mobile electronic device - Google Patents

Abstract

The present invention relates to a method for manufacturing an aluminum middle frame for a portable electronic device and an aluminum middle frame for a portable electronic device. More particularly, the present invention relates to a method for manufacturing an aluminum middle frame for a portable electronic device which can reduce material cost, simplify a processing process, A method of manufacturing a middle frame, and an aluminum middle frame for a portable electronic device. A method of manufacturing an aluminum middle frame for a portable electronic device, the method comprising: extruding an aluminum alloy material into a circular tube; Cutting the circular tube into a circular ring shape; Forming a circular ring-shaped aluminum alloy material into a square ring shape; Obtaining an intermediate member having a body portion and an inner protruding portion extending to the inside of the body portion by deforming a cross-sectional shape so that a rectangular ring shape is maintained by applying pressure to a square ring-shaped aluminum alloy material so that its cross-sectional shape is deformed; Machining the inner protrusion of the intermediate member to obtain a metal frame having at least one first through hole; And bolting the bracket to the metal frame.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method for manufacturing an aluminum middle frame for a portable electronic device, and an aluminum middle frame for a portable electronic device.

The present invention relates to a method for manufacturing an aluminum middle frame for a portable electronic device and an aluminum middle frame for a portable electronic device. More particularly, the present invention relates to a method for manufacturing an aluminum middle frame for a portable electronic device which can reduce material cost, simplify a processing process, A method of manufacturing a middle frame, and an aluminum middle frame for a portable electronic device.

In general, some of the handheld electronic devices, including Smartphones and Tablet PCs, have middle-frame applications. The middle frame may include a metal frame and a bracket. The metal frame forms a rim of the middle frame, forms a side portion of the portable electronic device to function as an outer case, and the bracket includes various electronic components And is used for the purpose of protecting or fixing. Recently, a metal frame is made of an aluminum alloy metal material to enhance durability. In addition, surface treatment using anodizing is performed for a luxurious appearance treatment.

Conventionally, a casting method is used as a method for manufacturing a metal frame. When a metal frame is manufactured by a casting method, materials such as silicon (Si), zinc (Zn), and manganese (Mn) are added to improve the fluidity of the aluminum alloy during casting. However, since such additive materials can act as impurities, there is a problem of lowering the strength of the formed metal frame. Further, among the additive materials, there is a problem of being discolored to black when anodized by silicon and zinc.

Therefore, in the case of the casting method, the anodizing process can not be performed and the painting process is performed. However, the coated middle frame can not have a more luxurious appearance than the anodizing process. Further, in the case of production through casting, aluminum ingots are mainly used, and it is important that the fluidity of the alloy is ensured. However, the 6000 series and 7000 series of high strength aluminum have low fluidity and it is difficult to use because the strength is lowered when the additives are added to improve the fluidity. This phenomenon may occur even when the metal frame is manufactured by a die casting method.

Metal frames are also manufactured by drawing. In the drawing process, a metal plate is formed into a tub shape having a bottom or a wide cup shape by using a press or the like, and then a bottom portion is removed to produce a metal frame. That is, in the case of manufacturing through drawing, in order to manufacture a metal frame, the bottom portion of the drawn product must be processed and removed, so that the loss of material is large, and processing time and cost are also increased. In the case of drawing processing, a material having high strength and hardness such as 7000 series of aluminum has a problem that drawing processing itself is difficult.

Patent Registration No. 10-0684276 (Feb. 20, 2007)

An object of the present invention is to provide a method of manufacturing an aluminum middle frame for a portable electronic device and a aluminum middle frame for a portable electronic device, in which material costs are reduced, a processing process is simplified, and a process defect rate can be reduced.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise form disclosed. There will be.

According to an aspect of the present invention, there is provided a method of manufacturing an aluminum middle frame for a portable electronic device, comprising the steps of: a) extruding an aluminum alloy material into a circular tube; b) Machining into a circular ring shape by cutting; c) forming the circular ring-shaped aluminum alloy material into a square ring shape; and d) an intermediate member having a body portion and an inner protrusion portion extending to the inside of the body portion so as to deform the cross-sectional shape so that the rectangular ring shape is maintained by applying pressure to the rectangular alloy-shaped aluminum alloy material, ; e) cutting the inner protrusion of the intermediate member to obtain a metal frame having at least one first through hole; And f) bolting the bracket to the metal frame. ≪ Desc / Clms Page number 3 >

In an embodiment of the present invention, the aluminum alloy material has a mass fraction percentage, and copper is more than 0 and not more than 2.6.

In the embodiment of the present invention, in the step c), the circular ring-shaped aluminum alloy material has a lower body of the punch inserted into the inner through hole, and is formed into a rectangular ring shape by the upper body extending upward from the lower body. Wherein the method comprises the steps of:

In the embodiment of the present invention, in the step (d), the cross-sectional shape modification process may be a forging process.

In an embodiment of the present invention, the forging may be cold forging.

In the embodiment of the present invention, the cold forging may be performed by a press having a capacity of 400 tons or more.

In the embodiment of the present invention, in the step d), the square alloy-shaped aluminum alloy material may be pressed with a press a plurality of times to be formed of the intermediate material.

In the embodiment of the present invention, in the step d), the intermediate member may be further formed with an outer protrusion extending to the outside of the body part.

In an embodiment of the present invention, a reinforcing portion may be further formed on each of the inner corners of the intermediate member.

In the embodiment of the present invention, the step (e) may further include cutting the outer protrusion by cutting.

In the embodiment of the present invention, the step (e) may further comprise cutting the body part.

In the embodiment of the present invention, in the step (e), the cutting process may be a computer numerical control (CNC) process.

In an embodiment of the present invention, the method may further include the step of surface-treating the metal frame after the step e).

In an embodiment of the present invention, the surface treatment may comprise anodizing.

In the embodiment of the present invention, in the step (f), the bracket may be formed with a second through hole corresponding to the first through hole so that the bolt is coupled to the bracket.

According to an aspect of the present invention, there is provided a method of manufacturing an aluminum alloy, the method comprising: cutting a circular tube extruded and processed from an aluminum alloy material into a circular ring shape; cutting the circular aluminum alloy material into a square ring shape; The intermediate ring member having a body portion and an inner protruding portion extending to the inside of the body portion so as to be deformed in a sectional shape so that the cross-sectional shape of the rectangular ring-shaped body is deformed by applying pressure to the rectangular alloy- A metal frame formed by cutting and having an inner protrusion formed with at least one first through hole; And a bracket bolted to the metal frame.

In the embodiment of the present invention, at least one of a slit, a hole and a notch may be formed in the body part.

In an embodiment of the present invention, a hairline portion or a knurling portion may be further formed on an outer circumferential surface of the body portion.

According to the embodiment of the present invention, since the intermediate member can be integrally compressed and formed by the shape-deforming process, shape deformation such as warping can be prevented and the strength can be increased.

Further, according to the embodiment of the present invention, since the intermediate member is formed in a ring shape corresponding to the metal frame to be formed through the cutting operation, the loss of material due to the cutting process can be reduced and the machining time can be reduced.

Further, according to the embodiment of the present invention, it is possible to manufacture a middle frame in which anodizing is performed on a metal frame while minimizing material loss.

According to the embodiment of the present invention, since the metal frame and the bracket are separately manufactured and joined by the coupling member, when a failure occurs in at least one of the metal frame or the bracket, the bolt is loosened to replace only the defective part .

It should be understood that the effects of the present invention are not limited to the above effects and include all effects that can be deduced from the detailed description of the present invention or the configuration of the invention described in the claims.

1 is a flowchart illustrating a method of manufacturing an aluminum middle frame for a portable electronic device according to an embodiment of the present invention.
FIG. 2 is a view illustrating an example of a manufacturing process of an intermediate member in a manufacturing process of an aluminum middle frame for a portable electronic device according to an embodiment of the present invention.
3 is a cross-sectional view illustrating a part of a mold for manufacturing an intermediate material in a manufacturing process of an aluminum middle frame for a portable electronic device according to an embodiment of the present invention.
FIG. 4 is a plan view of an intermediate member manufactured by a method for manufacturing an aluminum middle frame for a portable electronic device according to an embodiment of the present invention.
5 is a sectional view taken along line AA in Fig.
6 is a sectional view taken along line BB of Fig.
FIG. 7 is a flowchart showing a step of obtaining a metal frame in a method of manufacturing an aluminum middle frame for a portable electronic device according to an embodiment of the present invention.
8 is an exemplary view showing a manufacturing process after an intermediate member in a process of manufacturing a metal frame for a portable electronic device according to an embodiment of the present invention.
9 is a cross-sectional view taken along the line CC of Fig.
10 is a sectional view taken along line DD of Fig.
11 is an exploded perspective view illustrating an aluminum middle frame for a portable electronic device according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" (connected, connected, coupled) with another part, it is not only the case where it is "directly connected" "Is included. Also, when an element is referred to as "comprising ", it means that it can include other elements, not excluding other elements unless specifically stated otherwise.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

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

FIG. 1 is a flowchart illustrating a method of manufacturing an aluminum middle frame for a portable electronic device according to an embodiment of the present invention. FIG. 2 is a view illustrating a process of manufacturing an aluminum intermediate frame for a portable electronic device according to an exemplary embodiment of the present invention. FIG. 3 is a cross-sectional view illustrating a part of a mold for manufacturing an intermediate material in a manufacturing process of an aluminum middle frame for a portable electronic device according to an embodiment of the present invention, and FIG. 4 is a cross- FIG. 5 is a cross-sectional view taken along line AA of FIG. 4, and FIG. 6 is a cross-sectional view taken along the line BB of FIG. 4. As shown in FIG.

As shown in FIGS. 1 to 6, the manufacturing method of the aluminum middle frame for a portable electronic device according to the present embodiment may include a step S110 of extruding an aluminum alloy material and processing the aluminum alloy material into a circular tube 200. First, in step S110, the aluminum alloy material may include duralumin. Duralumin means high-strength aluminum alloy which has an age hardening property by adding copper, magnesium and one or two kinds of elements to aluminum. As the aluminum alloy, 6000 series and 7000 series can be used. Specifically, the 6000 series of the aluminum alloy is an aluminum (Al) -magnesium (Mg) -silicon (Si) alloy, and the copper component is 1.2 or less in mass fraction%. Aluminum alloy 7000 series is an aluminum (Al) -Zn (Zn) -Magnesium (Mg) alloy and has a copper fraction of 2.6 or less in mass fraction percentage. Aluminum 6000 series alloy has good strength and corrosion resistance. 7000 series of aluminum alloy has very high strength. By using an aluminum-based alloy including duralumin as a metal material, the final product can secure a suitable strength.

As shown in the figure, the tube 200 formed by extruding the aluminum alloy material may be in the shape of a pipe having a circular ring shape with a hollow formed therein, but the present invention is not limited thereto, And may include pipes of various shapes such as a pipe shape.

In addition, the present invention may include a step S120 of cutting the circular tube 200 into a circular ring shape. In step S120, the tube 200 may be cut by a cutting part (not shown) to be processed into a circular ring-shaped aluminum alloy material 210. Here, the cutting portion is a device for cutting the tube 200 using the cutting blade. Specifically, the cutting portion can cut the tube 200 by moving the cutting blade little by little from the outside of the tube 200 rotating in one direction to the inside of the tube 200. Since the tube 200 that is cut in the above manner contacts only the cut portion with the cut portion, the pressure exerted from the cut portion is small, so that the tube 200 can be prevented from being deformed. A method of cutting the tube 200 into a circular ring shape is not limited to one embodiment but a method of machining the tube 200 into a circular ring shape so that deformation does not occur in the tube 200 is all a method .

In addition, the length of the circumference of the tube 200 may be similar to the length of the body portion 231 of the intermediate member 230. The cross-sectional area of the ring-shaped aluminum alloy material 210 may be similar to or slightly larger than the cross-sectional area of the body portion 231 of the intermediate member 230. The ring-shaped aluminum alloy material 210 may have a cross-sectional area smaller than the cross-sectional area of the first ring-shaped aluminum alloy material 210 when the intermediate material 230 is formed through the foaming process and the cross-sectional shape modification process . The cross sectional area of the metal frame 240 formed by cutting the body portion 231 of the intermediate member 230 and the inner and outer projecting portions 232 and 233 may be further reduced than the cross sectional area of the intermediate member 230. Therefore, it is preferable that the cross-sectional area of the ring-shaped aluminum alloy material 210 is formed so as to secure a sufficient cross-sectional area when considering the entire process and the cross-sectional area of the metal frame 240.

Hereinafter, the present invention may include a step (S130) of forming a round ring-shaped aluminum alloy material 210 into a square ring shape.

In step S130, the forming may be performed by a pressing process using a punch (not shown). The punch is not limited to a specific configuration. For example, the punch may have an upper body and a lower body. The upper body may be formed in a shape in which a ring-shaped aluminum alloy material 210 is formed. In this embodiment, the upper body may have a rectangular cross-section. The lower body may be formed to extend from the lower portion of the upper body and may have a horn or hemispherical shape so as to be easily inserted into the inner through-hole of the ring-shaped aluminum alloy material 210. The punch may further include a stripper and a spring provided on both sides of the upper body or the lower body, and may further include an elevating module for moving the upper body and the lower body in the vertical direction. And, the punch can be driven by a small press capable of providing a pressing pressure of about 10 to 20 tons.

In the step S130, the pressing process for forming may be performed one or more times. For example, when the circumferential length of the ring-shaped aluminum alloy material 210 is shorter than the length of the body portion 241 of the metal frame 240, the deformation and the length of the ring- All of the forming needs to be done. Therefore, in such a case, one or more pressing processes can be performed so that stable forming can be performed by gradually deforming the shape. In this case, it is preferable that the thickness of the ring-shaped aluminum alloy material 210 is formed thicker than the thickness to be considered in the above situation.

Alternatively, the ring-shaped aluminum alloy material 210 may be formed into a rectangular ring shape under the pressure applied in the up, down, left, and right directions by at least one rectangular block inserted therein for forming. Alternatively, the ring-shaped aluminum alloy material 210 may be deformed by the tensile force applied to the hooks connected to the four portions corresponding to the corners of the quadrangle, and may be formed into a rectangular ring shape.

In step S130, a step of annealing the ring-shaped aluminum alloy material 210 before pressing may be further performed to improve forming workability

On the other hand, the tube 200 processed by extruding the aluminum alloy material may be in the form of a pipe having a rectangular ring shape. When the ring-shaped aluminum alloy material has a square ring shape and the total length of the ring-shaped aluminum alloy material corresponds to or is similar to the length of the body portion 231 of the intermediate member 230, a small number of pressing processes And a ring-shaped aluminum alloy material 220 having a desired level can be obtained by a single pressing process according to circumstances. Alternatively, the step of S130 may be omitted. In any case, since the ring-shaped aluminum alloy material is formed in the ring shape connected in the entire length section, the square-ring-shaped aluminum alloy material 220 having undergone the forming process can also be formed in the entire length section.

After step S130, the rectangular ring-shaped aluminum alloy material 220 is pressed by applying pressure to the square-ring-shaped aluminum alloy material 220 so that the cross-sectional shape of the rectangular ring- (S140) of obtaining the intermediate member 230 having the inner protruding portion 232 provided to extend can be performed. In step S140, the cross-sectional shape (see Fig. 5) of the square-ring-shaped aluminum alloy material 220 is deformed while the cross-sectional shape is deformed. Specifically, the intermediate member 230, in which the rectangular ring-shaped aluminum alloy material 220 is formed through a sectional shape modification process, includes a body portion 231 and an inner protrusion 232 extending to the inside of the body portion 231 Lt; / RTI > The intermediate member 230 may further have an outer protrusion 233 extending to the outside of the body portion 231. [ The inner projecting portion 232 and the outer projecting portion 233 can be respectively formed from the body portion 231 by the pressure applied during the sectional shape deforming process. The outer protrusion 233 of the intermediate member 230 is to be removed through a cutting process to be performed thereafter but the outer protrusion 233 is formed in the intermediate member 230 in step S140 so that the inner part 230 of the intermediate member 230, The balance and uniformity of the tissue can be maintained. In addition, the outer projection 233 can be utilized as a reference for alignment with the jig to which the intermediate member 230 is to be seated during the subsequent cutting operation.

The mold 180 used for manufacturing an intermediate material in step S140 may have an upper mold 181 and a lower mold 182. [ The inner shapes of the upper mold 181 and the lower mold 182 may be formed to be symmetrical to each other. The upper mold 181 and the lower mold 182 are respectively provided with a first molding section 183 for pressing the aluminum alloy material 220 to form the inner protrusion 232 of the intermediate material 230, A second forming part 184 for forming an outer protruding part 233 and a third forming part 185 for forming an outer protruding part 233. The material of the aluminum alloy material 220 flows into the first forming part 183 and the third forming part 185 during the pressing process of the upper mold 181 and the lower mold 182. In the second forming part 184, And the shape is deformed. Since the aluminum alloy material 220 is deformed while the material flows in both directions, the shape of the inner protruding portion can be well formed, and the balance and uniformity of the inner structure can be obtained as a whole throughout the intermediate material 230. In the absence of the third forming part 185, the aluminum alloy material 220 is deformed while the material is flowing only in the first forming part 183, that is, only in one direction. Since the flowability of the material is poor, 232 may not be satisfactory in shape or even if the inner protrusion 232 is formed, balance and uniformity of the internal structure of the entire intermediate member 230 may not be good.

Further, the intermediate member 230 may further have the reinforcing portion 234. The reinforcing portion 234 may be formed at each corner inner portion. The reinforcing portion 234 may be formed on both side surfaces of the inner projecting portion 232. The fourth forming portion 186 may be further formed on the upper mold 181 and the lower mold 182 to form the reinforcing portion 234 (see (c) and (d) of FIG. 3). The reinforcing portion 234 can help each side of the intermediate member 230 to be formed perpendicular to each other. Since the sectional shape of the intermediate member 230 is different from the sectional shape of the portion where the reinforcing portion 234 is formed and the portion of the intermediate member 230 where the reinforcing portion 234 is not formed, the sectional shape of a part of the intermediate member 230 may be different.

In the cross-sectional shape modification process in step S140, the cross-sectional shape is deformed by applying pressure to the rectangular aluminum alloy material 220, but the rectangular ring shape can be maintained at this time. In addition, the deformation of the cross-sectional shape through the above-mentioned cross-sectional shape deformation processing may be a deformation without being cut and crushed. The cross-sectional shape deformation processing may be forging processing.

Also, in step S140, the aluminum alloy material 220 having a square ring shape may be cold-forged. The press used in the cold forging process may be a large press having a capacity of 400 tons or more. Specifically, in the case of the hot forging process, it takes time to apply heat to the rectangular aluminum alloy material 220, and a device capable of withstanding high temperatures is additionally required. However, since the cold forging can be performed immediately at room temperature, the process can be carried out quickly, and a separate apparatus for enduring high temperatures is not required, which is economical. When a press having a capacity of less than 400 tons is used in the cold forging process, the square alloy-shaped aluminum alloy material 220 may not be deformed as desired due to insufficient pressure. Therefore, it is preferable to use a large press having a capacity of 400 tons or more in the cold forging process so that the amount of forging can be secured for material deformation. As the aluminum alloy used in the cold forging process, 6000 series of aluminum can be used.

However, when the aluminum alloy material 220 having a rectangular ring shape is made of aluminum material of 7000 series, since the strength of the square aluminum alloy material 220 is very high, the capacity of the press required for the cold forging process must be very large . Therefore, when the aluminum alloy material 220 having a rectangular ring shape is made of aluminum material of 7000 series, the forging process in step S140 is not limited to the cold forging process and can be performed by the hot forging process. In the case of a hot forging process, the aluminum alloy material 220 may undergo a preheating process at 300 to 400 ° C. According to the present invention, when 7000 series of aluminum is used, only 7000 series of aluminum can be manufactured by introducing only the hot forging process in the same process described above. The 7000 series of aluminum is difficult to draw, but it can be applied to the hot forging process.

Further, in the above-mentioned section-shape deforming step, the press can be applied to the aluminum alloy material 220 having a rectangular ring shape a plurality of times. That is, the press can apply the pressing pressure a plurality of times so that the aluminum alloy material 220 having the rectangular ring shape is deformed into the predetermined intermediate material 230.

As described above, the intermediate member 230 formed by the cross-sectional shape transformation is dense and has a high hardness and strength. In general, it is known that a product manufactured through forging is 3 to 5% more intense than a product manufactured through a drawing process. Such an increase in strength can be applied to a portable electronic device to provide an effect of increasing the durability of a metal frame frequently exposed to an external force such as a bending force.

In addition, since the intermediate member 230 according to the present invention can be integrally formed by forging, it can be prevented from deforming such as warping. Therefore, thereafter, when the intermediate member 230 is cut, it is possible to achieve the effect of ensuring the attachment to the cutting apparatus and preventing the breakage of the cutting tool. Further, since the intermediate member 230 is formed in a ring shape corresponding to the metal frame 240 to be formed through the subsequent machining, material loss due to the finishing process can be reduced, and the machining time can also be reduced.

FIG. 7 is a flowchart showing a step of obtaining a metal frame in a method of manufacturing an aluminum middle frame for a portable electronic device according to an embodiment of the present invention, FIG. 8 is a view illustrating a process of manufacturing a metal frame for a portable electronic device according to an embodiment of the present invention FIG. 9 is a cross-sectional view taken along the line CC of FIG. 8, and FIG. 10 is a cross-sectional view taken along line DD of FIG. Hereinafter, the present invention will be described with reference to FIGS.

After step S140, the inner protrusion 232 of the intermediate member 230 may be cut to obtain a metal frame 240 having one or more first through holes 243 (S150). The cutting process in step S150 may be computer numerical control (CNC) machining.

In step S150, one or more reference holes (not shown) are passed through the inner protrusion 232 and the outer protrusion 233 of the intermediate member 230 to position the intermediate member 230 in the correct position in the machine tool for cutting. . A pin (not shown) provided on the machine tool may be coupled to the reference hole, so that the intermediate member 230 can be accurately positioned on the machine tool. The inner protruding portion 242 may have a function of a support for preventing the deformation of the body 241 as well as a function of a support for supporting the bracket 250 in close contact. In cutting the inner protrusion 232, the pin of the machine tool may be coupled to the reference hole formed in the outer protrusion 233. Further, at least one first through hole 243 may be formed in the inner protruding portion 242. A bolt 252 for bolting the bracket 250 may be coupled to the first through hole 243. The first through hole 243 may be formed by machining a reference hole formed in the inner protrusion 232 or may be formed at a different position.

Step S150 includes a step S151 of cutting the outer protrusion 233 by cutting. In detail, the outer protrusion 233 may be cut and removed, and the pin may be coupled to the reference hole formed in the inner protrusion 232. In step S151, the corner portion of the body portion 231 may be faced or rounded through computer numerical control processing. A hairline portion or a knurling portion may be further formed on the outer circumferential surface of the body portion 241. [

In step S150, the body part 231 of the intermediate member 230 may be further machined to obtain the body part 241 of the metal frame 240.

In addition, the step S150 may include cutting the body portion 241 (S152). In step S152, various processes may be performed to form at least one of the hole 244, the slit 245, and the notch (not shown) in the body portion 241 through computer numerical control processing.

The order of cutting in step S150 is not limited to the above-described order. That is, after the body portion is first cut, the protruding portion may be cut. Also, the inner protrusion 232 may be cut before the outer protrusion 233, or the outer protrusion 233 may be cut before the inner protrusion 232, in the order of cutting of the protrusion.

In addition, the manufacturing method of the aluminum middle frame for a portable electronic device according to the present embodiment may further include the step of surface-treating the metal frame 240 (S160). Specifically, the metal frame 240 can be surface-treated by a sanding and anodizing process. The sanding may include sand blasting, which is a surface treatment method of polishing the surface of the workpiece by uniformly spraying the abrasive such as sand through the compressed air or the impeller to the workpiece at high speed and polishing the surface. Anodizing is a surface treatment method that protects a product with an oxide film formed by intentionally oxidizing and corroding a surface of a metal material and enables coloring on the porous surface.

In this embodiment, the surface of the metal frame 240 can be uniformed and polished by a sanding process in which an abrasive such as sand is jetted at high speed onto the surface of the metal frame 240. In this embodiment, by applying the sanding process to the metal frame 240, the deformed structure can be removed or uniformed during the cross-sectional shape deforming process. When the sanding process is completed, the anodizing process can be applied. The anodizing process may be a process of immersing the metal frame 240 in a solution and electrically oxidizing the metal frame 240 to form a porous transparent oxide layer on the surface of the metal frame 240, and then attaching various dyes on the porous transparent oxide layer.

11 is an exploded perspective view illustrating an aluminum middle frame for a portable electronic device according to an embodiment of the present invention. Hereinafter, FIG. 11 will be further described.

After step S160, a step S170 of bolting the bracket 250 to the metal frame 240 may be performed. The bracket 250 has an outer circumferential surface which is in close contact with the inner circumferential surface of the body portion 241 and is formed to be in close contact with one surface of the inner protruding portion 242. The bracket 250 has a second through hole 242 formed to correspond to the first through hole 243, Lt; RTI ID = 0.0 > 251 < / RTI > The bracket 250 may be made of one or more materials selected from a resin material and a metal material including plastic or the like.

The bracket 250 may be detachably coupled to the metal frame 240 for the portable electronic device by a method in which the bolt 252 is coupled to the first through hole 243 and the second through hole 251. [ One or more of the first through hole 243 and the second through hole 251 may be formed and the bracket 250 and the metal frame 240 may be detachably coupled by one or more bolts 252. [ . For example, the first through-hole 243 may be formed by one or more cutting processes on the inner protrusion 231 located at the top and the bottom of the intermediate member 230, respectively, and the second through- 250 and may be formed in positions and numbers corresponding to the first through holes 243.

The first through hole 243 may be threaded so that the bolt 252 can easily be coupled to the first through hole 243 through the second through hole 251. However, the bolt 252 may be coupled to the second through hole 251 through the first through hole 243, and in this case, a thread may be formed in the second through hole 251.

According to the present invention, when one or more of the metal frame 240 or the bracket 250 is defective by causing the metal frame 240 and the bracket 250 to be separately manufactured and coupled by the bolts 252, (252) is loosened to replace only defective parts. Therefore, parts can be recycled. Further, by allowing the metal frame 240 and the bracket 250 to be separately manufactured and joined by the bolt 252, warping can be prevented and the strength can be increased.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

200: tube
210: ring-shaped aluminum alloy material
220: Square alloy aluminum alloy material
230: intermediate member 231, 241:
232, 242: inner protrusion 233: outer protrusion
240: metal frame 243: first through hole
244: hole 245: slit
250: Bracket 251: Second through hole
252: Bolt

Claims (18)

A method of manufacturing an aluminum middle frame for a portable electronic device,
a) extruding an aluminum alloy material and processing it into a circular tube;
b) sectioning the circular tube to form a circular ring;
c) forming the circular ring-shaped aluminum alloy material into a square ring shape;
and d) an intermediate member having a body portion and an inner protrusion portion extending to the inside of the body portion so as to deform the cross-sectional shape so that the rectangular ring shape is maintained by applying pressure to the rectangular alloy-shaped aluminum alloy material, ;
e) cutting the inner protrusion of the intermediate member to obtain a metal frame having at least one first through hole; And
and f) bolting the bracket to the metal frame. The method according to claim 1,
Wherein the aluminum alloy material has a mass fraction% and a copper content of more than 0 and not more than 2.6. The method according to claim 1,
Wherein the circular ring-shaped aluminum alloy material in the step (c) has a lower body of the punch inserted into the inner through hole, and is formed into a square ring shape by an upper body extending upward from the lower body, A method of manufacturing a middle frame. The method according to claim 1,
Wherein the step of deforming the cross-sectional shape in step (d) is a forging process. 5. The method of claim 4,
Wherein the forging is cold forging. ≪ RTI ID = 0.0 > 11. < / RTI > 6. The method of claim 5,
Wherein the cold forging is performed by a press having a capacity of 400 tons or more. The method according to claim 1,
Wherein the rectangular alloy-shaped aluminum alloy material is pressed by pressing a plurality of times to form the intermediate member in the step d). The method according to claim 1,
Wherein in the step d), the intermediate member is further formed to have an outer projecting portion extending to the outside of the body portion. 9. The method of claim 8,
Wherein a reinforcing portion is further formed in each corner inner portion of the intermediate member. 9. The method of claim 8,
Wherein the step (e) further comprises a step of cutting off the outer protrusion to remove the inner protrusion. 11. The method of claim 10,
Wherein the step (e) further comprises cutting the body part. ≪ RTI ID = 0.0 > 8. < / RTI > The method according to claim 1,
Wherein in the step e), the cutting is computer numerical control (CNC) machining. The method according to claim 1,
Further comprising the step of surface treating the metal frame after step e). ≪ RTI ID = 0.0 > 11. < / RTI > 14. The method of claim 13,
Wherein the surface treatment comprises anodizing. ≪ RTI ID = 0.0 > 21. < / RTI > 14. The method of claim 13,
Wherein in the step (f), the bracket is formed with a second through hole corresponding to the first through hole so that the bolt is coupled to the bracket. A circular tube extruded and processed from an aluminum alloy material is cut to form a circular ring shape and a pressure is applied to the square ring-shaped aluminum alloy material in a state where the circular ring-shaped aluminum alloy material is formed into a square ring shape Wherein the intermediate ring member is formed by machining a cross-sectional shape of the rectangular ring shape to deform the cross-sectional shape thereof and having an inner protrusion portion extending to the inside of the body portion and the body portion, the inner protrusion being formed with one or more first through- A metal frame; And
And a bracket bolted to the metal frame. 17. The method of claim 16,
Wherein at least one of a slit, a hole and a notch is further formed in the body portion. 17. The method of claim 16,
And a hairline portion or knurling portion is further formed on an outer circumferential surface of the body portion.

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