KR20180048159A - Method for manufacturing metal frame for portable terminal - Google Patents

Abstract

The present invention relates to a manufacturing method for a metal frame for a portable terminal, which comprises: a metal body forming step of processing multi-stage press on a metal material continuously and by stages in order to integrate a back surface plate, forming the entire outer side of the back surface of a portable terminal, with a metal body, including a hollow edge side wall protruding from one surface of the back surface plate; and a resin injection molding step of conducting injection molding of a resin injection unit on the metal body through insert injection molding, by utilizing the metal body as an insert. The metal body forming step forms a flange which protrudes in the outer side direction along the circumference of the edge side wall during multi-press processing, forms a segment hole on the edge side wall at a position where an antenna for the portable terminal is installed, and forms a connection unit on the edge side wall where the segment hole is formed and separated, in order to be connected with the back surface plate. On the other hand, the resin injection molding step is to conduct injection molding so that the connection unit can be exposed while the resin injection unit closes the segment hole. In addition, the manufacturing method for a metal frame for a portable terminal comprises: a flange cutting step conducted after the resin injection molding step to remove the flange from the edge side wall through cutting; an anodizing step of realizing colors by adsorbing organic dye after anodizing on the surface of the metal body; and a connection unit cutting step conducted after the anodizing step to remove the connection unit exposed from the resin injection unit through cutting. The present invention is able to easily implement colors on a surface of a metal frame.

Description

[0001] METHOD FOR MANUFACTURING METAL FRAME FOR PORTABLE TERMINAL [0002]

The present invention relates to a method of manufacturing a metal frame of a portable terminal in which a manufacturing time is significantly shortened in manufacturing a metal frame of a portable terminal and a manufacturing cost can be greatly reduced by reducing the amount of raw materials used.

In general, a portable terminal such as a smart phone, a mobile phone, or a tablet PC is required to protect or fix various electronic components mounted therein, and a frame that serves as a housing for the purpose of enhancing durability and enhancing appearance by applying a metal frame Is required.

In recent years, in order to enhance the durability against external impact, the use of a metal frame whose outer frame is made of metal or the entire rear surface is made of metal is increasing. As shown in FIG. 2, in addition to the iPhone series of Apple, as shown in FIG. 1, such a metal frame uses a metal frame 10 having a metal frame made of metal on the outer frame and the rear side as shown in FIG. 2 . Description of the front frame, the display, the battery, and various electronic components in other drawings will be omitted.

3, the metal frame 10 of the portable terminal 1 is composed of a metal body 11 and a resin injection part 12 for supporting electronic parts and the like, 11 are divided into a rear plate 11a constituting the entire outer surface of the rear side of the portable terminal 1 and a side wall lib 11b constituting a hollow shape and forming the outer rim of the portable terminal 1. [

As a method of manufacturing the metal frame 10 having the above structure, there is a method of forming a rear plate 11a and a frame side wall 11b by cutting a metal material having a sufficient thickness like an iPhone series from the beginning to the end, A method of separately fabricating the rear plate 11a and the side sidewall 11b and assembling them together as in the 'metal case manufacturing method' of Japanese Patent Application Laid-Open No. 10-1618694, And a method of integrally forming the rear plate 11a and the frame sidewall 11b by press working such as a 'mobile phone metal case'.

However, when the metal frame 10 is manufactured only by cutting, the dimensional precision is high. However, due to the nature of the cutting process, it is difficult to realize a product having a complicated shape, the machining time becomes long, And the side sidewalls 11b are assembled and assembled together, there is a problem that the number of assembly parts is low, the productivity is low, and the defect occurrence rate is high due to the product tolerance.

In this regard, recent research and development has been actively conducted by a method of integrally forming a metal plate material by press working. However, when pressing is performed so that the side wall 11b is formed on the rear plate 11a during press working, And a connection hole is formed at a portion where the antenna is installed in order to utilize the characteristics of the antenna. In addition, in order to realize the surface color of the metal frame 10, And how to implement it.

In order to solve the above-mentioned problems, it is an object of the present invention to provide a metal frame in which a rear plate and a sidewall are integrally formed through a multi-stage pressing process, And an object of the present invention is to provide a method of manufacturing a metal frame of a portable terminal which can easily realize the surface color of the metal frame through the connection part even in an anodizing operation.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments with reference to the accompanying drawings.

In order to accomplish the above object, a method of manufacturing a metal frame of a portable terminal according to the present invention is a method for manufacturing a metal frame of a portable terminal, comprising the steps of continuously and stepwise multi-step pressing a metal material to form a rear plate, And a resin injection molding step of injecting and molding the resin injection part into the metal body by insert injection molding using the metal body as an insert, The metallic body forming step may include forming a flange protruding outward along the periphery of the rim of the rim during multistage press forming and forming a segment hole on a side wall of the rim at a position where the antenna of the portable terminal is installed, And the rear sidewall is formed on the sidewall of the frame, And the resin injection molding step is performed after the resin injection molding step so that the resin injection part is injection molded so as to expose the connection part while closing the segment hole, An anodizing step of performing coloring by adsorbing organic dyes after anodizing the surface of the metal body; and performing an anodizing step after the anodizing step and from the resin injection part And cutting the exposed connection part by cutting the connection part.

The method may further include a surface treatment step performed between the metal body forming step and the resin injection molding step and surface-treating the metal body to increase the bonding force of the resin injection part to the metal body.

Further, in the surface treatment step, the surface of the metal body is subjected to a treatment for increasing the oxygen content to form an oxygen-containing film containing oxygen, and the resin injection molding step is a step in which the resin injection part is a thermoplastic resin composition An additive compound having a functional group which reacts with an oxygen-containing coating, wherein the additive compound is selected from the group consisting of a carboxyl group and a salt thereof and an ester thereof, an epoxy group, a glycidyl group, an isocyanate group, a carbodiimide group, an amino group and a salt thereof, And at least one functional group selected from the group consisting of the esters.

The method further includes a sand blasting step performed between the flange cutting step and the anodizing step, in which the surface of the metal body is subjected to a sand blasting process to make the surface of the metal body more beautiful.

A method of manufacturing a metal frame of a portable terminal according to the present invention includes the steps of fabricating a metal frame in which a rear plate and a sidewall are integrally formed through a multistage pressing process, So that it is possible to easily realize the surface color of the metal frame through the connection part even when anodizing is carried out.

1 and 2 are exploded perspective views of a smartphone which has been recently launched and used,
FIG. 3 is a perspective view showing a metal frame of the embodiment of FIGS. 1 and 2,
4 is a flowchart illustrating a method of manufacturing a metal frame of a portable terminal according to an embodiment of the present invention,
5 is a perspective view showing a metal body formed by the metal body forming step in the embodiment of FIG. 4,
FIG. 6 is an enlarged perspective view of a main body of a metal body in which an antenna of the portable terminal is positioned,
Fig. 7 is a perspective view showing a state in which the resin injection part is integrally injection-molded on the metal body by the resin injection molding step in the embodiment of Fig. 4,
FIG. 8 is an enlarged perspective view of the main body of the metal body in which the antenna of the portable terminal is located in the embodiment of FIG. 7,
9 is a perspective view showing a metal body having a flange cut by a flange cutting step in the embodiment of FIG. 4,
FIG. 10 is an enlarged perspective view of the recess of the metal body where the antenna of the portable terminal is located in the embodiment of FIG. 9,
FIG. 11 is an enlarged perspective view of a recessed portion of a metal body having a connection portion cut by a connecting portion cutting step in the embodiment of FIG. 4,
12 is a flowchart showing another embodiment of a method of manufacturing a metal frame of a portable terminal according to the present invention.

Hereinafter, a preferred embodiment of a method of manufacturing a metal frame of a portable terminal will be described in detail with reference to the accompanying drawings.

4, the metal body forming step S100, the resin injection molding step S200, the flange cutting step S300, the anodizing step S400, And a connection cutting step S500, and may further include a surface treatment step S150 and a sand blasting step S350 as shown in FIG.

5 and 6, the metallic body forming step S100 is a step of forming a metal body by sequentially and stepwise multi-step pressing a metallic material to form a rear plate 110 And a hollow sidewall 120 protruding from one surface of the rear plate 110 are integrally formed.

In the metal body forming step S100, a flange 130 protruding outward along the edge sidewall 120 is formed during multi-step press forming, and an antenna (not shown) of the portable terminal 1 is installed And a connection part 150 connected to the rear plate 110 at the edge sidewall 120 where the segment hole 140 is formed and separated from the sidewall 120. [ .

When the rear plate 110 and the side sidewall 120 are directly formed by the conventional pressing process, the thickness and height of the side sidewall 120 can not be formed uniformly, and a problem such that the rounded corner portion breaks or tears The incidence is high. To solve this problem, a flange 130 protruding outward along the perimeter of the rim sidewall 120 is formed as shown in Figures 5 and 6, such that when the rim side wall 120 is formed, The rear plate 110 and the flange 130 are positioned and fixed with respect to the upper and lower pressing gold sidewalls 120 to help precisely form the sidewall sidewall 120 .

In addition, in the case of an antenna (not shown) of the portable terminal 10, a device for transmitting and receiving radio waves has rapidly developed due to the recent development of wireless communication technology, and is becoming smaller and lighter. In recent years, a planar inverted F antenna (PIFA), a small loop antenna, a chip antenna, an SMD antenna, and a DRA have been widely used in portable terminals 10, And is mounted inside to show antenna characteristics. Such a built-in antenna is mainly used for a smart phone. When the antenna is mounted on the metal body 100 as in the present invention, the transmission and reception characteristics of the antenna are degraded when the antenna is completely closed by the metal body 100. In order to solve this problem, an opening is formed in the metal body 100 on which the antenna is mounted, and is closed by the resin injection part 200 described later. At this time, since the openings are formed at the positions where the antennas are mounted, the metal bodies 100 must be separated.

When the metal body 100 is separated, the metal body 100 may not be manufactured separately, but may be integrally formed by multi-step pressing, but may be formed at a position where the antenna is mounted, and in an anodizing step S400 A segment hole 140 and a connection part 150 are provided together with the flange 130 so as to maintain the connected state of the metal part. That is, the flange 130 connects the metal part with the segment hole 140 in the formation of the segment hole 140 so that the metal part can not be separated. When the segment hole 140 is removed after the subsequent resin injection molding step S200, The resin injection part 200 is filled with the resin injection part 200 so that the resin injection part 200 is coupled with each other. In the case of the connection part 150, the metal part between the metal parts is separated from the parting hole 140 in the anodizing treatment, and the metal part between the metal part is maintained through the connection part 150 so that current can pass therethrough The anodizing process can be performed easily and then removed.

As shown in FIGS. 5 and 6, the metal body 100 having the above-described structure is formed by forming the rear plate 110, the sidewall 120, the flange 130, the segmented holes 140, and the connecting portion 150 So as to perform a resin injection molding step (S200).

That is, in the resin injection molding step (S200), the resin injection portion 200 is injection-molded into the metal body 100 by insert injection molding using the metal body 100 as an insert. 7 and 8, the resin injection part 200 closes the segment hole 140, as shown in FIGS. 7 and 8. In particular, the resin injection part 200 is formed by injection molding, So that the connection portion 150 is exposed. The reason that the resin injection part 200 is injection molded so as to close the segment hole 140 is that the metal part which is separated based on the segment hole 140 even if the flange 130 is removed through the flange cutting step S300 And the resin injection part 200 filled in the segment hole 140 can ensure the antenna characteristics of the portable terminal 1. [ The reason why the resin injection part 200 is injected so as to expose the connection part 150 is to easily remove the connection part 150 by the connection part cutting step S500 to be described later.

12, a surface treatment step S150 is performed between the metal body forming step S100 and the resin injection molding step S200, and the surface treatment step S150 is performed between the metal body 100 and the resin injection molding step S200. The metal body 100 is subjected to a surface treatment in order to increase the bonding force of the resin injection portion 200. More specifically, as the surface treatment for increasing the bonding force of the resin injection portion 200 by injection molding using the metal body 100 made of a metal as an insert, there is a method of inserting a mechanical fitting by a concave shape and a convex shape And the bonding strength with the resin injection part 200 can be increased through chemical treatment such as etching of the metal body 100 of the metal material.

In the present invention, an oxygen-containing coating is formed on the surface of the metal body 100 to maximize the bonding force between the metal body 100 and the resin injection part 200, and the oxygen- By adding an additive compound having a reactive functional group, a strong bonding force between the two dissimilar materials can be obtained. That is, in the surface treatment step S150, the surface of the metal body 100 formed by the metal body forming step S100 is treated to increase the oxygen content to form an oxygen-containing oxygen-containing film. In the resin injection molding step (S200), the resin injection part (200) contains an additive compound having a functional group that reacts with the oxygen-containing coating film as a thermoplastic resin composition, and the additive compound includes a carboxyl group and a salt thereof, At least one functional group selected from the group consisting of an epoxy group, a glycidyl group, an isocyanate group, a carbodiimide group, an amino group and a salt thereof, an acid anhydride group and an ester thereof.

In the surface treatment step S150, an oxygen-containing coating is formed on the surface of the metal body 100 by forming an oxygen-containing coating on the surface of the metal body 100. First, a zinc-containing coating is formed to form a metal body 100 To form a zinc-containing coating containing a zinc element as an oxygen-containing coating on the surface thereof, or to form a hydrous oxide coating by a second hot water, and to form a hydrous oxide coating by a third hot water And fourth, an oxide film is formed on the surface of the metal body 100 by laser etching by forming an oxide film by laser treatment.

The resin injection portion 200 containing the additive compound having a functional group reacting with the oxygen-containing coating film as the thermoplastic resin composition is injected and molded by using the metal body 100 having the surface treated to form the oxygen-containing film as the insert, It can have a strong bonding force.

7 and 8, the metal body 100 and the resin injection part 200 are formed through the metal body forming step S100 and the resin injection molding step S200. In the metal body 100, A flange cutting step (S300), an anodizing step (S400), and a connecting part cutting step (S500) are performed in order to remove unnecessary parts as finished products and to realize colors.

The flange cutting step S300 is performed after the resin injection molding step S200 and the connecting function of the metal part of the flange 130 before forming the resin injection part 200 is performed by forming the resin injection part 200 The flange 300 is cut from the rim side wall 120 and removed. When the flange 300 is removed by the flange cutting step S300 as shown in FIGS. 9 and 10, the overall shape except for the connecting portion 150 is the same as the finished product.

Accordingly, an anodizing step S400 is performed to apply a desired color to the metal body 100 from which the flange 300 has been removed through the flange cutting step S300. In the anodizing step S400, the surface of the metal body 100 is subjected to an anodic oxidation treatment, and the organic dye is adsorbed to realize a color. The anodizing treatment, that is, anodizing is performed by immersing the metal body 100 as an anode in an aqueous solution of an electrolyte such as sulfuric acid or nitric acid, and then flowing an electric current to generate oxygen in the metal body 100 as an anode by electrolysis, By oxidizing the parts to form an oxide film on the surface, the film is not dissolved even when exposed to the solution and the acid, thereby protecting the metal. In addition, when an organic dye is adsorbed on the thus formed film, various desired colors can be expressed.

In this anodizing step S400, since the metal body 100 becomes an anode and a current must flow, it is troublesome to form a pole for each metal part when it is separated for each metal part by the segment hole 140. [ In order to solve such a problem, even though they are divided into metal parts by the segment holes 140, the metal parts are connected to each other through the connection part 150 so that currents are connected to each other. This connection part 150 is for smoothly performing the anodizing step S400 and is removed by a connecting part cutting step S500 described later.

Meanwhile, in order to smooth the surface of the metal body 100 before performing the anodizing step S400, a sandblasting step S350 may be performed as shown in FIG. That is, the sandblasting step S350 is performed between the flange cutting step S300 and the anodizing step S400, and the surface of the metal body 100 is sandblasted to provide a beautiful surface. The sandblasting is effected by mixing the sand with the high-pressure water and spraying the sand on the surface of the metal body 100 to remove the impurities such as dust and oil, to strengthen the strength and to make the surface very beautiful.

If the metal body 100 has realized a desired color through the anodizing step S400, if the connection unit 150 is removed, it becomes an article. The connecting portion cutting step S500 is performed after the anodizing step S400 and the connecting portion 150 exposed from the resin emitting portion 200 is cut and processed .

As described above, in the method of manufacturing a metal frame of a portable terminal according to the present invention, a metal frame in which the rear plate 110 and the sidewall 120 are integrally formed through the multi-step pressing process is manufactured, The metal frame can be easily connected to the metal frame 150 through the connection part 150 during the anodizing operation.

The embodiments of the present invention described above and shown in the drawings should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art will be able to modify the technical idea of the present invention in various forms. Accordingly, such improvements and modifications will fall within the scope of the present invention as long as they are obvious to those skilled in the art.

100: metal body
110: rear plate 120: rim side wall
130: flange 140: segmented hole
150:
200: resin injection part
S100: Metal body forming step
S150: Surface treatment step
S200: resin injection molding step
S300: Flange cutting step
S350: Sand blasting step
S400: Anodizing step
S500: Cutting step of connection part

Claims (4)

A metal body forming step of integrally forming a metal body including a rear plate which forms the entire outer surface of the rear surface of the portable terminal and a hollow rim protruding from one surface of the rear plate,
And a resin injection molding step of injecting and molding the resin injection part into the metal body by insert injection molding using the metal body as an insert,
In the metal body forming step,
A step of forming a flange protruding outward along a periphery of the sidewall sidewall during multistage press forming, forming a segmented hole in the sidewall of the frame at a position where the antenna of the portable terminal is installed, A connecting portion connected to the rear plate is formed on the side wall of the frame,
The resin injection molding step comprises:
The resin injection portion is injection-molded so as to expose the connection portion while closing the segment hole,
A flange cutting step performed after the resin injection molding step to cut and remove the flange from the side wall of the flange,
An anodizing step of applying an anodic oxidation treatment to the surface of the metal body and adsorbing the organic dye to realize color;
And cutting the connecting portion, which is performed after the anodizing step and exposed from the resin injection portion, to remove the connection portion.
The method according to claim 1,
And a surface treatment step performed between the metal body forming step and the resin injection molding step and surface-treating the metal body to increase the bonding force of the resin injection part to the metal body. Gt;
3. The method of claim 2,
Wherein the surface treatment step comprises:
Treating the surface of the metal body to increase the oxygen content to form an oxygen-containing oxygen-containing film,
The resin injection molding step comprises:
Wherein the resin injection part comprises an additive compound having a functional group that reacts with the oxygen-containing coating film as a thermoplastic resin composition, wherein the additive compound is at least one selected from the group consisting of a carboxyl group, a salt thereof and an ester thereof, an epoxy group, a glycidyl group, an isocyanate group, a carbodiimide group, An amino group and a salt thereof, an acid anhydride group and an ester thereof.
The method according to claim 1,
Further comprising a sand blasting step performed between the flange cutting step and the anodizing step and performing a sand blasting process to smooth the surface of the metal body.

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