KR20190014662A - Manufacturing method of frame structure for portable device - Google Patents

Abstract

The present invention relates to a method for manufacturing a frame structure for a portable terminal, and more specifically, to a method for manufacturing a frame structure for a portable terminal, which can be easily processed and can reduce a processing time. The method for manufacturing the frame structure for the portable terminal of the present invention comprises: a frame member molding step for molding a plurality of frame members; and a built-in bracket forming step for inserting the plurality of frame members into an injection mold and injecting a resin to form a built-in bracket inside the frame members so that the plurality of frame members are integrally connected to each other.

Description

Technical Field [0001] The present invention relates to a manufacturing method of a frame structure for a portable terminal,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a frame structure for a portable terminal, and more particularly, to a method of manufacturing a frame structure for a portable terminal.

A portable terminal such as a smart phone may be equipped with a touch-enabled display device to perform various functions. Such a portable terminal is becoming a large-sized and lightweight.

Meanwhile, recently, a frame which is exposed to the outside is made of a metal material so that the heat generated from the inside is effectively released, and the interior parts are protected from external impact, so that a luxurious feeling can be obtained.

1 is a flowchart showing a conventional method of manufacturing a metal frame for a portable terminal. There is provided a method of manufacturing a metal frame for a portable terminal, the method comprising the steps of: (a) forming a housing frame that is exposed to the outside of a conventional portable terminal and a bracket frame formed inside the housing frame to support a display panel of the portable terminal and a main board The first to eighth steps are as follows.

In the first step, a metal material of an aluminum alloy is processed by an extrusion method to form a square pipe-shaped metal forming body having a hollow rectangular cross section and a predetermined length.

In the second step, the square shaped metal forming body is cut at regular intervals in the longitudinal direction to form a rectangular ring-shaped housing frame.

In the third step, a first CNC process is performed along the inner circumferential surface of the rectangular frame-shaped housing frame to form a concave / convex portion for casting casting.

In the fourth step, after the housing frame formed on the inner side of the concave-convex portion is inserted into the die-casting mold having the shape corresponding to the bracket frame, an undercate portion is formed on one side of the housing frame into which the metal material for diecasting is injected, And the underfloor portion is formed at the other side of the housing frame from which the metal material is discharged, the molten metal material is injected to the inside of the housing frame so that the under gate portion is disposed at one side, A die casting step of forming a bracket frame formed body in which a flow portion is disposed is performed.

In the fifth step, the second CNC process is performed on the bracket frame formed body to remove the under gate portion and the under-over flow portion formed on one side and the other side of the bracket frame formed body.

In the sixth step, the inner surface of the bracket frame formed article from which the undergate portion and the underflow portion are removed is pressed to form at least one component mounting hole.

In the seventh step, the third CNC process is performed on the bracket frame formed body having the component mounting holes to complete the bracket frame.

In an eighth step, an oxide film and color tone are coated on the surface of the metal frame including the housing frame and the bracket frame by an anodizing method to prevent corrosion.

The casting casting concavity and convexity formed by the first CNC process in the third step may be along the circumference of the inside of the rectangular frame-like housing frame to increase the bonding force with the die casting cast during the die casting process of the fourth step. A concave groove or a convexly protruding shape.

In the third CNC process of the seventh step, the front surface of the bracket frame formed body formed with the component mounting holes is machined to form a seating portion for a display panel, and a back surface of the bracket frame molded body is processed to process a tapped hole for a fastening screw .

However, in the conventional method of manufacturing a metal frame for a portable terminal, since the first to third steps of forming the housing frame take a long time to process and the amount of material to be cut is large, it is uneconomical.

Korean Registered Patent No. 10-1717469 (Mar. 17, 2017) Korean Registered Patent No. 10-1717545 (Mar. 17, 2017)

SUMMARY OF THE INVENTION The present invention provides a method of manufacturing a frame structure for a portable terminal that can be easily processed, shorten a processing time, and can be manufactured efficiently and economically by reducing the cost of material required. There is a purpose.

According to another aspect of the present invention, there is provided a method of manufacturing a frame structure for a portable terminal, the method comprising: a frame member molding step of molding a plurality of frame members; a step of inserting a plurality of frame members into the injection mold, And a built-in bracket forming step of forming a built-in bracket inside the plurality of frame members so that the members are integrally connected.

And, the frame member forming step may pass the metal material between the rollers to mold the frame member.

Further, the frame member forming step may press the metal material to mold the frame member.

An inflow space is formed between the plurality of frame members inserted into the injection mold, and the resin flows into the inflow space to integrally join the plurality of frame members.

The frame member forming step forms a receiving groove inside the frame member. In the built-in bracket forming step, the resin flows into the receiving grooves of the plurality of frame members to integrally join the plurality of frame members.

According to another aspect of the present invention, there is provided a method of manufacturing a frame structure for a portable terminal, the method including forming a concavity and convexity on a surface of the frame member after the frame member forming step, And is formed to be bonded to the surface of the frame member on which the concavities and convexities are formed.

The irregularities are formed by laser etching or chemical etching.

A plurality of guide holes are formed in the frame member, and the guide holes guide the position of the frame member when the frame member is inserted into the injection mold in the built-in bracket forming step.

The method of manufacturing a frame structure for a portable terminal according to the present invention can easily process, shorten the processing time, reduce the cost of material, increase productivity and secure cost competitiveness.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flowchart showing a conventional method of manufacturing a metal frame for a portable terminal.
2 is a flowchart schematically illustrating a method of manufacturing a frame structure for a portable terminal according to an embodiment of the present invention.
3 is a perspective view showing a frame member according to an embodiment of the present invention.
4 is a plan view of a frame member formed in accordance with an embodiment of the present invention.
5 is a plan view of a frame member formed in accordance with another embodiment of the present invention.
6 is a cross-sectional view of a frame member in which unevenness is formed according to an embodiment of the present invention.
7 is a cross-sectional view of a frame member in which unevenness is formed according to another embodiment of the present invention.
8 is a perspective view illustrating a frame member and a built-in bracket integrally formed according to an embodiment of the present invention;

Hereinafter, a method of manufacturing a frame structure for a portable terminal of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 2 to 8, the method for manufacturing a frame structure for a portable tamper according to an exemplary embodiment of the present invention includes a frame member forming step, a bending step, a concavo-convex forming step, a built-in bracket forming step, .

The frame member forming step forms a plurality of frame members (100). This frame member forming step can mold the frame member 100 by rolling or press forming. Examples of the material for forming the frame member 100 include SUS-based metals, copper alloy-based metals, Al-based metals, and titanium (Ti).

First, in the forming of the frame member using rolling, a metal material is passed between rollers (not shown) to mold the frame member 100 as shown in Fig. 3 (a). The frame member 100 can be formed into various shapes according to the shape of the roller.

When the frame member 100 is formed using the rolling, separate guide holes 120 may be formed after the frame member forming step. As shown in FIG. 4, a plurality of guide holes 120 are formed in the frame member 100 in the step of forming the guide holes 120. The guide hole 120 guides the position of the frame member 100 when the frame member 100 is inserted into the injection mold (not shown) in the step of forming the built-in bracket. In order to guide the position of the frame member 100 inserted into the injection mold, a guide protrusion (not shown) corresponding to the guide hole 120 may be formed in the injection mold.

On the other hand, in the frame member forming step using press forming, the frame member 100 as shown in Fig. 3 (b) can be formed by inserting a metal material into a press mold (not shown) and press-working.

When the frame member 100 is molded using the press forming, the receiving groove 101 is formed on one side of the frame member 100 as shown in Fig. 7 (a). In the receiving groove 101, as shown in FIG. 7 (b), the injection resin flows in the built-in bracket forming step to form the built-in bracket 200.

As shown in FIG. 5, a plurality of guide holes 120 may be formed in the frame member 100 while molding the frame member 100, in the frame member molding step using press forming.

The frame member 100 is formed by using the rolling or press forming as described above so that the entire process for forming the frame member 100 is processed by the CNC process in comparison with the processing of the frame member 100, And the processing time can be shortened. In addition, when the frame member 100 is formed by rolling, a high material rigidity can be secured.

The bending step bends at least one of the plurality of frame members 100. In order to manufacture the frame structure for a portable terminal of the present invention, a plurality of frame members 100 are required, and two frame members 100 or four frame members 100 are required according to various embodiments of the present invention.

As shown in FIG. 4 or 5, two frame members 100 are used in the embodiment of the present invention, and both of the two frame members 100 are bent at the bending step.

In addition, although not shown separately, one frame member 100 may be used to fabricate the frame structure for a portable terminal of the present invention. At this time, the bending step bends the frame member 100 such that both ends of one frame member 100 face each other.

The frame structure for a portable terminal of the present invention has a substantially rectangular shape depending on the shape of the portable terminal, and the bent portion of the frame structure is a corner of the frame structure for the portable terminal.

The bending step as described above can be performed using a multi-forming machine (not shown). In general, a multi-forming machine is formed by forming grooves or holes on a strip-shaped metal plate, or by forming a plurality of foaming machines arranged at regular intervals in a radial direction, that is, Thus, various shapes of automobiles, mobile phone parts, and the like can be manufactured.

Specifically, such a multi-forming machine usually has a supply portion for supplying a metal strip material (frame member 100 in the present invention) from the winding drum, a level portion for serving to straighten the supplied metal material, A feeder that feeds the material to a press or a forming machine by setting a dimension (length) for making the material, a press that forms a groove or a hole in the metal material, or a plurality of forming units arranged in a radial manner, A forming section that performs foaming several times, and the like.

As shown in FIG. 6 or FIG. 7, the unevenness forming step forms the unevenness 130 on the surface of the frame member 100. The concavity and convexity formation step is for forming a microscopic interlock between the frame member 100 and the built-in bracket 200, which are integrally formed with each other.

Concretely, in the step of forming concavity and convexity, irregularities 130 having a uniform pattern shape are formed on the inner surface of the frame member 100 to which the built-in bracket 200 is joined. The irregularities 130 are formed by a laser etching method, and grooves having a predetermined depth are formed at uniform intervals by irradiating a laser beam onto the surface of the frame member 100. At this time, the depth of the groove formed on the surface of the frame member 100 is 150 to 200 탆.

The unevenness forming step may be performed by forming the unevenness 130 on the surface of the frame member 100 by a chemical etching method or by using a laser etching method and a chemical etching method, ) May be formed.

The concavity and convexity forming step as described above can easily and conveniently form the irregularities 130 of the predetermined pattern shape on the surface of the frame member 100. The concave and convex portions 130 are formed on the surface of the frame member 100 through the concave and convex forming steps so that the coupling force between the frame member 100 and the built-in bracket 200 is improved and the integrated frame member 100 and the built- 200 can uniformly maintain the quality of the frame structure for a portable terminal.

In the step of forming the built-in bracket, the frame member 100 is inserted into the injection mold, and then the resin is injected into the injection mold so that the built-in bracket 200 is fixed to the frame member (Fig. 6 100). In the built-in bracket forming step, the built-in bracket 200 is formed to be joined to the inner surface of the frame member 100 in which the concave and convex portions 130 are formed.

As one embodiment of the present invention, two frame members 100 are inserted into an injection mold. 4 or 5, an inflow space 110 may be formed between the two frame members 100 inserted into the injection mold. The resin for forming the built-in bracket 200 may be introduced into the inflow space 110 to couple the two frame members 100 together.

Also, since the built-in bracket 200 is integrally formed between the two frame members 100, the two frame members 100 are integrated together with the built-in bracket 200.

As another embodiment of the present invention, when one frame member 100 is used, an inflow space 110 may be formed between both ends of one frame member 100.

7, when the frame member 100 is molded using the press forming, the injection resin flows into the receiving groove 101 formed inside the frame member 100, and the receiving groove 101 The concave and convex portions 130 are formed on the surface of the receiving groove 101 where the built-in bracket 200 is formed.

The post-machining step is performed by using CNC machining, etc., to perform dimensional correction, detailed shape machining, and removal of unnecessary parts.

The exterior surface treatment step performs the surface treatment of the frame structure for the portable terminal by a physical / chemical method. Such a surface treatment is a general method and a detailed description is omitted.

The method of manufacturing a frame structure for a portable terminal according to the present invention is not limited to the above-described embodiments, and various modifications may be made within the scope of the technical idea of the present invention.

100: frame member,
101: receiving groove,
110: inflow space,
120: guide hole,
130: uneven,
200: Built-in bracket,

Claims (8)

A frame member molding step of molding a plurality of frame members and a step of inserting a plurality of frame members into an injection mold and injecting resin to form a built-in bracket on the inside of the plurality of frame members so that the plurality of frame members are integrally connected And a step of forming a built-in bracket to be formed on the base member. The method according to claim 1,
Wherein the frame member forming step comprises passing the metal material through the rollers to form the frame member. The method according to claim 1,
Wherein the forming of the frame member is performed by pressing a metal material to form the frame member. The method according to claim 1,
Wherein an inflow space is formed between the plurality of frame members inserted into the injection mold and the resin flows into the inflow space to integrally join the plurality of frame members. The method of claim 3,
Wherein the frame member forming step forms a receiving groove in the inside of the frame member,
Wherein the step of forming the built-in bracket includes a step of allowing resin to flow into the receiving grooves of the plurality of frame members to integrally join the plurality of frame members. The method according to claim 1,
And forming a concavity and convexity on the surface of the frame member after the frame member forming step,
Wherein the built-in bracket is formed to be joined to the surface of the frame member on which the concavities and convexities are formed, in the step of forming the built-in bracket. The method of claim 6,
Wherein the unevenness forming step forms the unevenness by laser etching or chemical etching. The method according to claim 1,
A plurality of guide holes are formed in the frame member,
Wherein the guide hole guides the position of the frame member when the frame member is inserted into the injection mold in the built-in bracket forming step.

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