阅读说明：本技术 便携式终端用机架结构物的制备方法 (Method for manufacturing frame structure for portable terminal ) 是由 琴琪弦 廉灿国 于 2018-07-27 设计创作，主要内容包括：本发明涉及一种便携式终端用机架结构物的制备方法,具体涉及一种可以缩短加工时间并增强材料刚性的便携式终端用机架结构物的制备方法。本发明的便携式终端用机架结构物的制备方法,其包括：滚轧步骤,其使金属材料穿过滚轮之间,成型机架构件；以及压铸步骤,其将所述机架构件插入到压铸模具之后,向所述压铸模具浇注金属镕液,使内置金属的托架与所述机架构件形成一体型。(The present invention relates to a method for manufacturing a frame structure for a portable terminal, and more particularly, to a method for manufacturing a frame structure for a portable terminal, which can shorten a processing time and enhance rigidity of a material. The invention provides a method for preparing a frame structure for a portable terminal, which comprises the following steps: a rolling step of passing the metal material between the rollers to form a frame member; and a die casting step of inserting the frame member into a die casting mold, and then pouring a molten metal into the die casting mold to form an integral body of the metal-containing bracket and the frame member.)

1. A method for manufacturing a frame structure for a portable terminal, comprising: the method comprises the following steps:

a rolling step of passing the metal material between the rollers to form a frame member;

and a die casting step of inserting the frame member into a die casting mold, and then pouring a molten metal into the die casting mold to form an integral body of the metal-containing bracket and the frame member;

the rolling step forms a plurality of frame members;

the die casting step forms the built-in brackets connected to the plurality of frame members, respectively, and integrally combines the plurality of frame members;

an inflow space is formed between the plurality of frame members inserted into the die casting mold, and melted metal flows into the inflow space to join the plurality of frame members;

after the rolling step, further comprising: a bending step of bending at least one of the plurality of frame members, a bending step of bending the frame members so that both end surfaces of one of the frame members face each other, and a 1 st unevenness forming step of forming unevenness on a surface of the frame member;

in the die-casting step, the built-in bracket is bonded to a surface of the frame member on which the unevenness is formed.

2. The method for manufacturing a housing structure for a portable terminal according to claim 1, wherein: the 1 st irregularity forming step forms the irregularities by laser etching or chemical etching.

3. The method for manufacturing a housing structure for a portable terminal according to claim 1, wherein: after the rolling step, a 1 st guide hole forming step of forming a plurality of 1 st guide holes in the frame member is further included, and the 1 st guide hole guides the position of the frame member when the frame member is inserted into the die casting mold in the die casting step.

4. The method for manufacturing a housing structure for a portable terminal according to claim 1, wherein: after the die casting step, further comprising: and an in-mold injection step of inserting the integrally formed frame member and built-in bracket into an injection mold and forming an injection part inside the frame member forming the built-in bracket, the built-in bracket forming a 2 nd guide hole for guiding the positions of the frame member and built-in bracket inserted into the injection mold.

5. The method for manufacturing a housing structure for a portable terminal according to claim 1, wherein: the frame member is formed of one or more of SUS series metal, copper alloy series metal, Al series metal, and titanium (Ti).

6. The method for manufacturing a housing structure for a portable terminal according to claim 5, wherein: after the die casting step, further comprising: performing the surface treatment process of the frame member to perform an exterior surface treatment step as a final step, the frame member being molded using a titanium (Ti) material, the exterior surface treatment step performing an Anodizing (Anodizing) treatment on the surface of the frame member after performing an optical polishing on the surface of the frame member.

Technical Field

The present invention relates to a method for manufacturing a frame structure for a portable terminal, and more particularly, to a method for manufacturing a frame structure for a portable terminal, which can shorten a processing time and enhance rigidity of a material.

Background

Portable terminals such as smart phones have a display capable of touch input, and can implement various functions. A large screen and light weight of the portable terminal have become a trend. And recently, the rack exposed to the outside is being made of a metal material in order to effectively discharge heat generated from the inside, protect internal parts from external impact, and exhibit high-end quality.

Fig. 1 is a flowchart of a method for manufacturing a metal chassis for a portable terminal according to a conventional art. A metal chassis for a portable terminal of the conventional art includes: a housing frame constituting an edge appearance of the portable terminal and exposed to the outside; a cradle frame formed inside an edge of the housing frame to support a display panel and a main board of a portable terminal, the manufacturing method of which substantially comprises the following steps 1 to 8:

step 1: an aluminum alloy metal material is processed by an extrusion method to form a square tubular metal forming body with a certain length, wherein the square tubular metal forming body has a hollow square cross section.

Step 2: and cutting and processing the square tubular metal forming body at certain intervals along the length direction to form a square annular shell frame.

Step 3: and (3) performing a 1 st CNC process along the periphery of the inner side surface of the square annular shell frame to form a concave-convex part for casting and combining.

Step 4: after the housing frame having the concave-convex portion formed on the inner surface thereof is inserted into the die casting mold corresponding to the tray frame, a molten metal material is poured into the housing frame, and a die casting process is performed to form a tray frame molding body having the hidden gate portion disposed on one side thereof and the hidden overflow portion disposed on the other side thereof, so that the hidden gate portion is formed on one side of the housing frame where the metal material for die casting is poured, and the hidden overflow portion is formed on the other side of the housing frame where the metal material for die casting is discharged.

Step 5: and performing a 2 nd CNC process on the carrier frame molded body, and removing the hidden gate portion and the hidden overflow portion formed at one side and the other side of the carrier frame molded body.

Step 6: and stamping the inner surface of the bracket frame forming body with the hidden gate part and the hidden overflow part removed to form more than one component mounting hole.

And 7, a step: and (3) carrying out a 3 rd CNC process on the bracket frame forming body forming the component mounting hole to manufacture the finished bracket frame.

Step 8: and coating an anti-corrosion oxide film on the surfaces of the metal frames including the shell frame and the bracket frame in an anodic oxidation mode and performing color coating.

In the step 3, the casting bonding concavo-convex part formed by the 1 st CNC process is processed into a groove shape or a convex shape recessed along the circumference of the inner side surface of the square ring-shaped housing frame, so as to enhance the bonding force with the casting for die casting poured when the die casting process in the step 4 is performed.

And, the 3 rd CNC process of the 7 th step processes the front surface of the bracket frame molding body in which the part mounting holes are formed, forms the display panel mounting portion, processes the rear surface of the bracket frame molding body, and processes the screw hole for the locking screw.

However, in the conventional method for manufacturing a metal housing for a portable terminal, the processing time of the 1 st to 3 rd steps for forming the housing is long, and the amount of consumables for cutting processing is large, so that the method is not practical. And the manufacturing method of the metal chassis for the portable terminal of the conventional art is limited in securing high rigidity of the housing chassis material.

(prior art documents)

(patent document 1) Korean registered patent publication No. 10-1717469 (3 and 17 months in 2017)

(patent document 2) korean registered patent publication No. 10-1717545 (3/17/2017).

Disclosure of Invention

Technical problem

In order to solve the above disadvantages, the present invention provides a method for manufacturing a frame structure for a portable terminal, which can shorten a processing time, save costs of required materials, have high efficiency, are economical, and have enhanced rigidity of materials.

Technical scheme

In order to achieve the above object of the present invention, the present invention provides a method for manufacturing a housing structure for a portable terminal, comprising: a rolling step of passing the metal material between the rollers to form a frame member; and a die casting step of inserting the frame member into a die casting mold, and then pouring a molten metal into the die casting mold to form an integral body of the metal-containing bracket and the frame member.

In the rolling step, a plurality of frame members are formed, and in the die-casting step, the built-in brackets connected to the plurality of frame members are formed, and the plurality of frame members are integrally combined.

And an inflow space is formed between the plurality of frame members inserted into the die-casting mold, and the inflow space is filled with melted metal to join the plurality of frame members.

Further, the method for manufacturing a frame structure for a portable terminal according to the present invention further includes, after the rolling step: and a bending step of bending at least one of the plurality of frame members.

Further, the method for manufacturing a frame structure for a portable terminal according to the present invention further includes, after the rolling step: bending the frame member so that both ends of the frame member face each other.

Further, the method for manufacturing a frame structure for a portable terminal according to the present invention further includes, after the rolling step: a 1 st unevenness forming step of forming unevenness on a surface of the frame member, the die-casting step in which the built-in bracket is bonded to the surface of the frame member on which the unevenness is formed.

Specifically, the 1 st irregularity forming step forms the irregularities by laser etching or chemical etching.

Further, the method for manufacturing a frame structure for a portable terminal according to the present invention may further include, after the rolling step: a 1 st guide hole forming step of forming a plurality of 1 st guide holes in the frame member, the 1 st guide hole guiding a position of the frame member when the frame member is inserted into the die-casting mold in the die-casting step.

The method for manufacturing a housing structure for a portable terminal according to the present invention further includes, after the die-casting step, the steps of: in the in-mold injection step of inserting the integrally formed frame member and built-in bracket into an injection mold and forming an injection part at an inner side of the frame member formed with the built-in bracket, the built-in bracket may be formed with a 2 nd guide hole which guides a position of the frame member and built-in bracket inserted into the injection mold.

Advantageous effects

The method for preparing the frame structure for the portable terminal can shorten the processing time, save the cost of required materials, improve the production efficiency, ensure the cost competitiveness and enhance the rigidity of metal part materials.

Drawings

Fig. 1 is a flowchart of a method for manufacturing a metal chassis for a portable terminal in the conventional art.

Fig. 2 is a schematic flowchart of a method for manufacturing a housing structure for a portable terminal according to an embodiment of the present invention.

Fig. 3 is a cross-sectional view of a frame member of an embodiment of the present invention.

Fig. 4 is a plan view of a frame member forming guide hole 1 of the embodiment of the present invention.

Fig. 5 is a sectional view of a frame member forming the concavity and convexity of the embodiment of the invention.

Fig. 6 is a cross-sectional view of a housing member and a built-in bracket formed in a single body type according to an embodiment of the present invention.

Fig. 7 is a sectional view of a housing member and a built-in bracket formed in a single body type according to an embodiment of the present invention.

Fig. 8 is a sectional view of a housing member, a built-in bracket, and an injection molded part formed in an integrated type according to an embodiment of the present invention.

Fig. 9 is a sectional view of a housing structure for a portable terminal prepared in an embodiment of the present invention.

Detailed Description

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

As shown in fig. 2, a method for manufacturing a housing structure for a portable terminal according to an embodiment of the present invention includes: the method comprises the following steps of rolling, bending, 1 st guide hole forming, 1 st concave-convex forming, die casting, 1 time of post-processing, 2 nd concave-convex forming, in-mold injection molding, 2 times of post-processing and external surface treatment.

In the rolling step, the metallic material is passed between rollers (not shown) to form the frame member 100. The frame member 100 is formed in various shapes according to the shape of the roller. Examples of the material for the forming frame member 100 include SUS-series metals, copper alloy-series metals, Al-series metals, titanium (Ti), and the like.

As described above, when the frame member 100 is formed through the rolling step, the entire process of forming the frame member 100 can save the cost of consumables and shorten the processing time compared to processing the frame member 100 through the CNC process. And, the frame member 100 is formed through the rolling step, thereby securing high rigidity of the material.

In the bending step, one or more frame members 100 among the plurality of frame members 100 are bent. To manufacture the housing structure for a portable terminal of the present invention, a plurality of housing members 100 are required, and according to various embodiments of the present invention, 2 housing members 100 or 4 housing members 100 are required.

As shown in fig. 3, the embodiment of the present invention utilizes 2 frame members 100, and the bending step bends all of the 2 frame members 100.

Although not shown, a chassis member 100 may be used to manufacture the portable terminal chassis structure according to the present invention. At this time, the bending step bends the frame member 100 so that both end surfaces of the frame member 100 face each other.

The frame structure for a mobile terminal according to the present invention is approximately rectangular along the shape of the mobile terminal, and the portion bent by the bending step is a corner portion of the frame structure for a mobile terminal.

As described above, the bending step may be performed using a multi-molding machine (not shown). In general, a multiple molding machine is a machine in which grooves or holes are formed in a strip-shaped metal plate or a plurality of machines are arranged in a fan shape at a predetermined interval, and in other words, a machine is bent 1 or more times at different positions at a plurality of angles by a punch press to manufacture various shapes of parts for automobiles and cellular phones.

Specifically, the multiple molding machine includes: a supply section that supplies a general strip-shaped metal material (a frame member in the present invention) from a reel; a flattening portion straightening the supplied metal material; a feeding section that sets the metal material supplied from the flattening section to a production size (length) and transfers the metal material to a punch or a molding machine; and a molding section or the like which is composed of a punch press for forming grooves, holes, or the like in a metal material or a plurality of molding machines arranged in a fan shape, and which performs molding by cutting the metal material a plurality of times.

As shown in fig. 4, the 1 st via forming step forms a plurality of 1 st vias 120 in the chassis member 100. The 1 st guide hole 120 guides the position of the frame member 100 when the frame member 100 is inserted into a die-casting mold (not shown) in a die-casting step. As described above, in order to guide the position of the frame member 100 inserted into the die casting mold, it is preferable that a guide protrusion (not shown) corresponding to the 1 st guide hole 120 is formed inside the die casting mold.

As shown in fig. 5, the 1 st irregularity forming step forms irregularities 130 on the surface of the chassis member 100. The 1 st unevenness forming step forms a micro engagement structure (microcopic Interlock) between the housing member 100 and the built-in bracket 200 which are integrally formed with each other.

Specifically, the 1 st irregularity forming step forms irregularities 130 of uniform shape on the inner side surface of the chassis member 100 to which the built-in bracket 200 is joined. The unevenness 130 is formed by laser etching, and a groove having a certain depth is formed at a certain interval by irradiating laser to the surface of the frame member 100. In this case, the depth of the groove formed on the surface of the frame member 100 is 150 to 200 ㎛.

In the 1 st unevenness forming step, the unevenness 130 may be formed on the surface of the frame member 100 by a chemical etching method, or the unevenness 130 may be formed on the surface of the frame member 100 by a composite method using both a laser etching method and a chemical etching method.

As described above, the 1 st irregularity forming step can easily and conveniently form the irregularities 130 having a uniform pattern on the surface of the chassis member 100. In addition, the unevenness 130 is formed on the surface of the chassis member 100 by the 1 st unevenness forming step, so that the coupling force between the chassis member 100 and the built-in bracket 200 is enhanced, and the chassis structure for the portable terminal, which is formed by integrally forming the chassis member 100 and the built-in bracket 200, maintains uniform quality.

The die casting step inserts the frame member 100 into a die casting mold, and then pours molten metal into the die casting mold, as shown in fig. 6, so that the metal built-in bracket 200 is formed integrally with the frame member 100. As shown in fig. 7, in the die-casting step, the built-in bracket 200 is joined to the inner side surface of the frame member 100 on which the unevenness 130 is formed.

In one embodiment of the present invention, 2 frame members 100 are inserted into a die casting mold. Also, as shown in fig. 4, an inflow space 110 may be formed between 2 frame members 100 inserted into the die casting mold. The melted metal for forming the inner bracket 200 is poured into the inflow space 110 and cooled, thereby joining 2 frame members 100 to each other.

The built-in bracket 200 is integrally formed between the 2 frame members 100, so that the 2 frame members 100 and the built-in bracket 200 are integrally formed together.

In another embodiment of the present invention, when a frame member 100 is used, an inflow space 110 is formed between both ends of the frame member 100.

Through the die-casting step, the built-in carrier 200 may form the 2 nd guide hole 210 as shown in fig. 6. Also, after the die-casting step is performed, the 2 nd guide hole forming step may be performed separately to form the 2 nd guide hole 210 on the built-in bracket 200.

When the housing member 100 and the built-in bracket 200 integrally formed in the in-mold injection step are inserted into an injection mold (not shown), the 2 nd guide hole 210 guides the positions of the housing member 100 and the built-in bracket 200. In this manner, in order to guide the positions of the housing member 100 and the built-in bracket 200 inserted into the injection mold, it is preferable that a guide protrusion (not shown) corresponding to the 2 nd guide hole 210 is formed inside the injection mold.

The 1-time post-processing step is performed by performing, for example, CNC processing to adjust the size, process a specific shape, and remove excess portions.

The 2 nd unevenness forming step forms unevenness on the surface of the frame member 100 or the built-in bracket. The 2 nd concave-convex forming step forms the concave-convex in order to enhance the coupling force between the injection molded part formed by the in-mold molding step and the metallic frame member 100 or the built-in bracket 200. The 2 nd uneven portion forming step is the same as the 1 st uneven portion forming step, and therefore, a detailed description thereof is omitted here.

The in-mold injection step inserts the integrally formed housing member 100 and the built-in bracket 200 into an injection mold, and, as shown in fig. 8, forms an injection part 300 inside the housing member 100 in which the built-in bracket 200 is formed. At this time, the built-in bracket 200 forms a 2 nd guide hole 210 to guide the positions of the frame member 100 and the built-in bracket 200 inserted into the injection mold.

The 2 post-processing steps implement processes of calibrating the size, processing the specific shape, removing the unnecessary portion by CNC processing, polishing, grinding, etc., as shown in fig. 9, to achieve the final appearance shape before the external surface treatment step is implemented.

The external surface treatment step implements a surface treatment process of the frame structure for the portable terminal by a physical/chemical method.

When the titanium (Ti) material is used to form the frame member 100, the external surface treatment process includes the following steps:

first, the surface of the frame member is optically polished. Specifically, the optical polishing is performed by mounting a wheel made of synthetic fiber on a polishing polisher, rotating at a high speed, and polishing the surface of the frame member 100 molded with a titanium (Ti) material to form a beautiful mirror surface gloss on the surface of the frame member 100.

In addition, the surface of the frame member 100 is anodized (Anodizing) to form an anodized film, and the appearance of the frame member 100 exposed to the outside can be expressed by various colors, thereby improving corrosion resistance and wear resistance and meeting the reliability requirement of the product.

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