KR101642287B1

KR101642287B1 - manufacture method of light metals outer panel

Info

Publication number: KR101642287B1
Application number: KR1020150132910A
Authority: KR
Inventors: 박도봉; 박진우
Original assignee: (주)알루코
Priority date: 2015-09-10
Filing date: 2015-09-21
Publication date: 2016-07-27

Abstract

The present invention relates to a method to manufacture a lightweight metal exterior material to prevent cracks from occurring during a course of forming an exterior material, to prevent properties from being weakened, to easily perform a surface treatment, and to prevent stains from occurring on the treated surface and, more specifically, relates to a method to manufacture a lightweight metal exterior material wherein after ductile lightweight metal such as aluminum is refrigerated to equal to or lower than 0°C in a state where the ductile lightweight metal is extruded, that is, after forming in a state where ductility is maintained, a strength is raised by pressurization to prevent cracks from occurring in the material during the course of forming or to prevent properties from being changed; and a structure is made denser by pressing after forming, thus preventing stains caused by coating with a finishing material in the treatment process. The method comprises: (A) a low-temperature heat treatment step; (B) a preliminary forming step; (C) a press hardening and forming step; (D) a CNC processing step; and (E) a surface treatment step.

Description

Manufacturing method of light metals outer panel [0002]

More particularly, the present invention relates to a method for manufacturing a lightweight outer cover material, and more particularly, to a method for manufacturing a lightweight outer cover material that prevents cracks from occurring during molding of a casing material, To a method of manufacturing a light metal outer material which can prevent stains from being formed on the surface.

More specifically, the present invention relates to a method for producing a molded article, which comprises extruding a soft light metal such as aluminum and storing it in a refrigerator at 0 ° C or lower, that is, molding in a state in which ductility is maintained, The present invention relates to a light metal outer material manufacturing chamber capable of preventing cracks or changes in physical properties as well as preventing staining caused by a finish material coated in a post- will be.

As electric, electronic, and processing technologies are developed, various portable devices that are small and light and easy to carry are being developed.

In addition, most household appliances are provided with a remote controller (also referred to as a "remote controller" hereinafter) for remote control.

Among such electronic apparatuses, there are portable electronic apparatuses such as personal portable telephones, PDAs, MP3 players, PMPs, portable game machines, navigation systems, digital cameras, and the like. Is a lightweight, exquisite exterior that seeks to achieve aesthetic excellence, beautiful gloss and color and texture of the surface of the various expressions, most users are using electronic equipment with external wear or tear by friction or contact, etc. A separate protective case may be used to prevent such an occurrence, or if an external case of the electronic device does not fit the user's taste or is tired, a separate external cover may be purchased and attached or fastened.

Such an outer cover is usually made of a metal material such as aluminum or stainless steel. The outer cover made of a metal has color and texture and luster unique to metal, so that a more luxurious aesthetic feeling is produced compared to conventional synthetic resin. It is relatively durable and relatively safe from scratches and friction.

Various methods for fabricating a case or an exterior material using such a metal material have been developed, for example, Patent Documents 1 and 2.

Patent Document 1 discloses a method of manufacturing a metal décor frame for use in a portable electronic device, comprising: a raw material preparation step for preparing a metal bar type material; An end-face machining process for bending and cutting the end face of the metal bar type material prepared in the preparation process; A frame bending process for bending a metal bar type material processed in the end-face machining process into a frame shape for use in an electronic device to be used; And a joint joining process for joining both side ends of the frame of the metal bar type material processed in the frame bending process. In order to improve the ease of strength reinforcement and assembly in the end face machining process, The present invention relates to a method of manufacturing a metal decoy frame used in a portable electronic device,

In Patent Document 2, a film is attached to the surface of a metal plate, a film corresponding to the pattern is removed by a photomasking process in a metal plate having the film attached thereto, and then the metal plate having the film attached thereto is polished by an electrolytic polishing process And a luster is formed only on the removed portion.

The conventional exterior material manufacturing method of Patent Document 1 is formed by bending and bonding after processing. The exterior material manufactured by the conventional exterior material manufacturing method by this method is not only weak in strength, There is a disadvantage in that unevenness is generated on the surface that is finally surface-treated.

In addition, a method for producing a light metal outer material is usually a method in which an extruded material is heat-treated, the heat-treated material is pressed and molded, and then the surface is subjected to a surface treatment.

A method of manufacturing a light metal outer material by such a method is characterized in that the extruded material is cured by heat treatment and then pressed to form a crack. During the pressing process, There is a problem in that the physical properties are weakened in the course of the process.

In addition, as described above, there is a problem in that when physical properties are partially changed during the molding process after curing, and when the finished product partially changed in physical properties is painted, unevenness occurs in parts having different physical properties.

1. Korean Patent No. 1390973 2. Korean Patent Publication No. 10-2015-0053473

The present invention has been developed in order to solve the problems of the prior art as described above, and it is an object of the present invention to prevent cracks from occurring in the molding process of the casing, to prevent the deterioration of physical properties, And it is an object of the present invention to provide a method of manufacturing a light metal casing material which can prevent unevenness on the surface treated surface.

More specifically, the present invention relates to a method for producing a molded article, which comprises extruding a soft light metal such as aluminum and storing it in a refrigerator at 0 ° C or lower to prevent hardening due to natural aging, that is, molding in a state in which ductility is maintained, It is possible to prevent the occurrence of cracks in the material during the molding process or to prevent the physical properties from being changed and also to prevent the stain caused by the finish material applied in the post-treatment process The present invention also provides a method for manufacturing a light metal casing material.

In order to achieve the above object, the present invention provides a method of manufacturing a light metal casing material, comprising the steps of: (A) cutting a plate material having a softness by extrusion to a desired size; (B) a preforming step of pressing and forming a plate-shaped material cut from the low-temperature heat-treated material; (C) a press curing and molding step of pressing the preform to form a desired thickness and increasing the density of the material to strengthen the strength; (D) a CNC machining step for forming a hole in a finished workpiece and finishing a corner; (E) a surface treatment step of surface-treating the formed product, which has been completed, so as to prevent the physical properties of the material from being changed or cracking due to molding before the material is cured.

It is preferable to further carry out a heat treatment step of heat-treating the formed preform in the preforming step to strengthen the strength.

The surface treatment may be an anodizing, painting, or plating. The surface treatment may be performed by any one of buffing, blasting, wire brushing, The surface polishing step may be further performed.

It is also preferred that the preforms formed in the preforming step have a volume greater than 101 to 110% greater than the finished formings, and that the exterior materials of the desired dimensions are produced by press molding in the press curing and molding steps.

The low temperature heat treatment step is preferably performed at a temperature of 0 ° C or lower.

The light metal cladding material according to another aspect of the present invention is made by the above-described method, which prevents cracks or physical properties from being changed during the manufacturing process, and prevents stains from occurring after the post-treatment process.

As described above, in the method for manufacturing a light metal outer material according to the present invention, after forming a soft light metal such as aluminum in a state of being extruded, that is, in a state in which ductility is maintained, And it is possible to prevent changes in physical properties.

In addition, not only the physical properties of the exterior material formed by the pressing process after the molding process are enhanced, but also the structure is dense to provide a stronger exterior material, and the stain caused by the finish material coated in the post- It is possible to provide a more beautiful outer material.

1 is a schematic view showing a manufacturing process of a light metal casing material according to the present invention
2 is a perspective view illustrating a process of manufacturing a cell phone case according to a preferred embodiment of the present invention;

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Like reference numerals are used for like elements in describing each drawing. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

In the method for manufacturing a light metal casing material according to the present invention, a material is stored in a refrigerator at 0 ° C or below to maintain ductility, and molding is performed in a state where ductility is maintained. After the molding is performed, It is possible to prevent a material from being cracked or from being weak in physical properties.

The method for manufacturing a light metal outer material according to the present invention comprises the steps of: (A) cutting a plate material having an extruded and ductile shape to a desired size and performing low temperature heat treatment to maintain ductility; (B) a preforming step of pressing and forming a plate-shaped material cut from the low-temperature heat-treated material; (C) a press curing and molding step of pressing the preform to form a desired thickness and increasing the density of the material to strengthen the strength; (D) a CNC machining step for forming a hole in a finished workpiece and finishing a corner; (E) a surface treatment step of surface-treating the formed product which has been finished.

The preliminary forming step is a step of forming a plate-like material produced by extruding a light metal, particularly aluminum, by press-forming a plate as shown in Fig. 2 (a) and molding it into a desired shape as shown in Fig. 2 (b) do.

In this case, since the material is an extruded raw material, it maintains the ductility of the aluminum itself, so that it can be easily bent or deformed due to the action of ductility in the process of pressurization, so that plastic deformation does not occur, It does not happen.

Further, the extruded material is prevented from being hardened by naturally aging the material extruded by performing the low-temperature heat treatment step, so that the ductility of the material is maintained intact. By performing the molding step in such a state that the ductility is maintained, It is possible to prevent a crack from occurring in the process.

In the low temperature heat treatment step, the treatment temperature is preferably 0 DEG C or lower.

The preforms thus produced in the preforming stage are weak in strength.

Thereby strengthening the strength through the press hardening and molding steps.

The press hardening and molding step is a step for further pressing the preform formed in the preforming step to make the structure of the material more dense so that the physical properties of the entire exterior material can be maintained evenly.

The volume of the casing is reduced by further pressing the preform at the press curing and molding step. Therefore, it is preferable that the preform formed in the preforming step is made 101 to 110% thicker than the finished molded article.

That is, as shown in Figs. 2 (b) and 2 (c), the thickness (T2) of the exterior material press-molded in the press curing and molding step is thicker than the thickness T1 of the preform, And preferably about 101 to 110%.

The thickness ratio may vary depending on the kind of the material and the extrusion conditions in the extrusion process.

As described above, the outer casing reinforced by the press curing and forming steps has an unnecessary deformation portion 10w as shown in Figs. 2 (b) and 2 (c). The unnecessary portions are collected, A CNC machining step is performed to form holes or to form grooves.

Of course, in the CNC machining stage, surface finishing is also done, and the finished surface of the exterior material is smooth.

The exterior material having the final shape formed by the CNC processing step is painted or polished on the surface in the surface processing step.

That is, the surface treatment is an operation for making the surface of the finished casing material more beautiful by using any one of anodizing, painting, and plating. Of course, it is preferable to polish the surface by any one of surface polishing methods such as buffing, blasting, and wire brushing before the surface treatment.

In the method of manufacturing a light metal outer material according to the present invention as described above, it is preferable that the preform formed in the preforming step is further subjected to a heat treatment step for heat-treating to strengthen the strength.

By performing the press hardening and molding steps in the state of softening the material by the heat treatment as described above, the texture of the material can be made more compact by the pressure applied in the press hardening and molding step.

It is also preferable that the heat treatment step is performed at least 24 hours after the preforming. This is because the natural aging takes about 24 hours.

If the waiting time is excessively long after the heat treatment, the material is hardened due to the firing aging, thereby lowering the heat treatment effect.

The light metal outer case made by the above method may be various types such as a mobile phone case, a remote control case, and the like. As shown in FIG. 2 (d), a space in which the components are installed may be formed, A hole may be formed.

10w: unnecessary deformation part

Claims

(A) A plate-shaped material having an extruded and ductile shape is cut to a desired size, and the material is formed at a temperature of 0 ° C or lower to maintain ductility before the material is cured, thereby changing the physical properties of the material or causing cracks A low temperature heat treatment step; (B) a preforming step of pressing and forming a plate-shaped material cut from the low-temperature heat-treated material; (C) a press curing and molding step of pressing a preform made to be 101 to 110% thicker than the finished moldings formed in the preliminary molding step to form a desired thickness and enhancing the strength of the material by increasing the density of the material; (D) a CNC machining step for forming a hole in a finished workpiece and finishing a corner; (E) a surface treatment step of surface-treating the formed product by any one of anodizing, painting and plating, and performing surface treatment before buffing, blasting, wire brushing A method of manufacturing a light metal shell material further comprising a surface polishing step of polishing the surface by any one of the surface polishing methods,
The low-temperature heat treatment is performed in a refrigerator of 0 ° C or lower so as to maintain the ductility. In the process of molding in the next preliminary molding step, molding is performed in a state where the ductility of the material is maintained Thereby preventing cracks from being generated in the material.

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