KR20080001718A - Method of press-working of decorated metal panel and formed metal panel method thereof - Google Patents

Abstract

A press processing method of a metallic panel whose surface is decorated is provided to improve production yield of a metallic panel product favorably by press-processing the metallic panel safely without a surface damage and to improve productivity of the product by eliminating a grinding process of the product. A press processing method of a metallic panel whose surface is decorated includes a step of decorating a surface of the metallic panel by using a pattern, a signal, a number, letters, and a combination thereof; a step of adhering a metallic protection layer on a decorated metallic sheet by using an adhesive agent; a step of forming the metallic panel with a specific shape by inserting the metallic sheet with adhered metallic protection layer, into a mold, and removing an unnecessary portion of an edge for the metallic panel by a cutting process; and a step of softening the adhesive agent by heating the formed metallic sheet, and separating the metallic protection layer.

Description

Press-processing method of surface-decorated metal panel and metal panel manufactured by the method {Method of press-working of decorated metal panel and formed metal panel method

1 is a step-by-step reference diagram of a conventional metal panel press processing method.

2 is a process flowchart of a conventional metal panel press working method.

3 is an explanatory view showing a cross section of a press working process and a forming metal panel produced by the process of the decorative metal panel according to the present invention.

4 is a process flowchart of the press working method of the decorative metal panel according to the present invention.

5 is an explanatory view showing a cross section of another forming process of the decorative metal panel according to the present invention and the forming metal panel of another embodiment produced by the process.

6 is a process flowchart of another embodiment of the press working method of the decorative metal panel according to the present invention.

Figure 7 is a flow diagram of the decoration process, such as color patterns for the resin film layer on the metal sheet that can be applied to the present invention.

8 is a flow chart of the color pattern decoration process for the surface of the metal sheet that can be applied to the present invention.

* Description of the symbols for the main parts of the drawings *

12,13: mold 20: metal sheet

21: adhesive layer 22: metal protective film

23: adhesive layer 24: resin film

25: metal protective film curved portion 26: metal sheet curved portion

27: cutting line 28: burr

The present invention relates to a press working method of a metal panel or an automobile panel used in a case of a portable terminal, a home appliance, etc., and a processed product thereof. In particular, the present invention safely press-processes a desired shape without damaging the surface of a metal panel having a plated or decorated surface The present invention relates to a press working method of a surface-decorated metal panel and a metal panel produced by the method.

Recently, the case of various electrical and electronic devices such as a case of a portable terminal including a mobile phone, a PDA, a notebook computer, or a decoration panel of a home appliance is gradually replaced by a metal material from a conventional polymer resin material.

As a case material for various electric and electronic devices, if a metal panel is used instead of a conventional molded injection-molded polymer resin panel, the size and volume of the product can be reduced, and thus, an additional process for providing a separate electromagnetic shielding function can be omitted. In addition, the stiffness of the case can be greatly improved, and the appearance can be kept beautiful.

Figure 1 is a step-by-step reference cross-sectional view of a conventional metal panel press processing method, Figure 2 is a step-by-step process flow diagram.

As referred to herein, after the protective vinyl coating or paint coating (11) on the metal sheet (10) printed with various patterns, it is inserted into the mold (12, 13) by pressing the pattern is provided The metal sheet 10 is molded into a panel having a desired shape. The metal sheet press-formed as described above is cut along the cutting line 17 to remove unnecessary parts of the formed metal panel, and a burr of the cut surface is processed by using a grinder 19 to process one metal panel press-worked product. Will complete.

However, in the conventional metal panel processing process as described above, since the mold molding pressure is increased in the metal sheet curved portion 16 formed by the curved portions of the molds 12 and 13, the vinyl coated curved portion 15 of the corresponding portion is easily formed. It peels off and the metal sheet of the curved part is easy to be damaged.

At this time, the damaged part of the metal sheet generated during the press molding can be covered by using a grinding machine, etc., but the burrs are removed, resulting in an increase in the number of products, resulting in a decrease in the productivity of the product. In the case of the decoration, if the damage is applied to the surface of the metal sheet is impossible to repair because it is classified as a defective product has a problem that the production yield is significantly reduced.

The present invention is to solve the problems of the prior art as described above, an object of the present invention is to significantly reduce the production yield of metal panel products by making it possible to safely press the desired shape without damaging the surface of the metal panel is decorated or plated surface In addition, the present invention provides a press-processing method of a surface-decorated metal panel and a metal panel manufactured by the method, which can improve the productivity of the product by omitting the post-treatment process (polishing process, etc.) of the product. It is.

Press processing method of the surface-decorated metal panel of the present invention for achieving the above object is the step of decorating the surface through a pattern, figures, symbols, numbers, letters or a combination thereof on the metal sheet, and on the decorated metal sheet Adhering a metal protective film using an adhesive to the metal sheet, inserting the metal sheet having the metal protective film attached thereto into a mold, forming a metal panel having a specific shape, and then removing the unnecessary portion of the metal panel edge through a cutting process; , Softening the pressure-sensitive adhesive by heating the formed metal sheet, and then separating the metal protective film.

In another aspect, the press-processing method of the surface-decorated metal panel of the present invention comprises the steps of forming a high heat-resistant thermosetting or thermoplastic resin film layer on the metal sheet, and the pattern, figure, symbol, number, letter or Decorating the surface by a combination thereof, applying a pressure-sensitive adhesive having a relatively lower heat resistance than the resin coating layer on the surface-decorated resin coating layer, and then adhering a metal protective film, and a decorative resin coating layer having the metal protective film adhered thereto. Inserting the prepared metal sheet into a mold to form a metal panel having a specific shape, and then removing the unnecessary portion of the edge of the metal panel through a cutting process; and heating the formed metal sheet to soften a low heat-resistant adhesive and then decorate the And separating the metal protective film from the resin coating layer.

In addition, another method of pressing the surface-decorated metal panel of the present invention is a thermosetting or thermoplastic high heat-resistant resin whose surface is decorated with patterns, figures, symbols, numbers, letters, or a combination thereof after applying an adhesive on the metal sheet. Adhering a film, applying a lower heat-resistant adhesive on the surface-decorated resin film, and then adhering a metal protective film thereon; and attaching the metal protective film to the mold Inserting and forming into a metal panel of a specific shape and then removing the unnecessary portion of the edge of the metal panel through a cutting process, and heating the metal panel having a foamed resin film to soften the pressure-sensitive adhesive and then remove the metal protective film Characterized in that it comprises a.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

FIG. 3 shows a press forming process of a decorated metal panel according to the present invention and a schematic cross-sectional structure of a formed metal panel obtained by the process. FIG. 4 shows a press forming process of the metal panel according to the present invention. The process flow chart described in sequence is shown.

As referred to herein, the adhesive is applied to the upper surface of the surface-decorated metal sheet 20 to form an adhesive layer 21 and the metal protective film 22 is disposed thereon to attach the adhesive. Here, the metal sheet 20 may be a metal plate material such as aluminum, stainless steel, magnesium, galvanium. In addition, the surface decoration of the metal sheet 20 is a generic name for all the decorations that can be made through patterns, figures, symbols, numbers, characters or a combination thereof, and further includes a color pattern. In addition, the surface decoration of the metal sheet 20 includes that the metal surface is beautifully treated by plating or the like.

Next, the metal sheet 20 to which the metal protective film 22 is attached is inserted into molds 12 and 13 to mold and form a specific shape, and then a cutting process is performed along the cutting line 27 to form the metal sheet 20. Remove the unnecessary edges of the old metal panel.

At this time, in the cutting process at the time of removing the unnecessary portion of the metal panel, a burr 28 is generated at the outermost material, that is, at the edge of the metal protective film 22, but at the cut surface of the metal panel which is located inside the metal panel. It forms a complete cut surface where no burr is generated. This eliminates the need for a separate polishing process of the metal panel cut surface.

Next, heating is performed to a forming metal panel manufactured by the press mold of the metal sheet 20 at a temperature necessary for softening the adhesive layer 21.

This softens the pressure-sensitive adhesive of the adhesive layer 21 so that the metal protective film 22 can be easily separated from the formed metal panel, without damaging the surface decoration (or surface plating layer) of the formed metal panel at all. The final finished product of the press-formed flawless metal panel can be obtained.

When the metal sheet 20 is press-formed, the mold molding pressure is increased in the metal sheet curved portion 26 formed by the curved portions of the molds 12 and 13, so that the pressure is applied to the corresponding portion (the metal protective film curved portion 25). Although concentrated, these pressures are all covered by the metal protective film 22 having a high surface strength, thereby preventing the metal sheet 20 from being damaged.

As the material of the metal protective film 22, a stainless plate, an aluminum plate, a steel sheet, or the like may be used.

On the other hand, the surface decoration of the metal sheet 20 may decorate the desired pattern, etc. according to the order of the separate metal surface pattern forming process.

In this case, when the metal sheet is aluminum or magnesium, the surface of the aluminum or magnesium plate is oxidized, and then the primary color-decomposed color pigments are sequentially deposited on the pinhole of the oxidized anodized layer. The surface decoration can be formed by, letters or a combination thereof.

This will be described in detail with reference to FIG. 8 as follows.

First, an oxide film is formed on the metal sheet.

Next, the photoresist coating process and the drying process are performed on the oxide film of the metal sheet in the order of primary color deposition process.

Next, the masking films of yellow, magenta, and cyan color of primary color separation are sequentially exposed and washed.

Next, each of the yellow, magenta, and cyan pigments is sequentially deposited through the dyeing and drying of the selected color, and the remaining emulsion portion is removed.

Next, using a ceramic or fluorine-based resin is also coated on the top for the sealing of the pinhole.

In the above-described decorative process such as color patterns on the metal surface, the process of depositing a series of sequential primary colors (yellow, magenta, cyan) in order to avoid the complexity of explanation, and the color deposition process in the process of FIG. It should be understood that is repeated three times for each primary color unit.

On the other hand, unlike the method of directly forming a color pattern on the (oxidized) metal surface for the surface decoration of the metal panel, a resin layer is formed by applying a thermosetting or thermoplastic resin on the metal sheet, and the pattern is formed on the resin layer. Another method of forming the metal panel surface decoration method may be used.

The resin coating layer-based metal surface decoration method and the press working method of the metal panel to which the surface decoration is given are as follows.

First, a high heat resistance thermosetting or thermoplastic resin film layer is formed on a metal sheet of any one of various metal sheets, such as aluminum, stainless, magnesium, and galvanium.

Next, the surface is decorated with a pattern, figure, symbol, number, letter or a combination thereof on the resin film layer.

Next, a pressure-sensitive adhesive having a relatively lower heat resistance than that of the resin coating layer is applied onto the surface decorated resin coating layer. On the pressure-sensitive adhesive, a metal protective film is disposed as described above in order to prevent scratches or the like from occurring in the formed metal panel during press forming of the metal sheet.

Thus, a metal sheet having a metal protective film adhesively disposed thereon is inserted into a mold to form a metal panel having a specific shape.

The metal sheet is formed to form a metal panel of uniform shape, and then the unnecessary portion of the edge is removed.

Next, the molded metal sheet is heated to soften the low heat-resistant adhesive, and then the metal protective film is separated from the decorated resin film layer, thereby completing the surface-decorated defect-free press processed metal panel product.

7 is a flowchart illustrating a process of decorating a surface through patterns, figures, symbols, numbers, letters, or a combination thereof on the resin film layer.

Here, first, a resin film layer is formed by applying a resin having high heat resistance of thermosetting or thermoplastic series on a metal sheet.

Next, the photoresist coating process and the drying process are performed on the oxide film of the metal sheet in the order of primary color deposition process.

Next, each masking film of primary color-decomposed yellow, magenta, and cyan color is sequentially exposed and washed.

Next, the yellow, magenta, and cyan pigments are sequentially deposited by dye coating and drying of the selected color, and the remaining emulsion part is removed by various patterns, figures, letters and numbers on the resin coating layer on the metal sheet. It can be decorated.

Here, similarly to the process embodiment of FIG. 8 described above, in the process of decorating the color pattern or the like on the resin coating layer on the metal surface, a series of sequential primary colors (yellow, magenta, cyan) are used to avoid complicated explanation of the process sequence. The deposition process is a compressor. Therefore, it should be understood that the color deposition process in the process shown in FIG. 7 is repeated three times for each primary color unit.

5 shows a press forming process of a metal sheet for obtaining a decorated metal panel according to another embodiment of the present invention and a schematic cross-sectional structure of the formed metal panel obtained by the process, and FIG. Another embodiment of the present invention shows a process flow chart sequentially explaining the press working process of a metal panel.

As referred to herein, first, an adhesive is applied to the surface of the metal sheet 20 to form an adhesive layer 23 and the resin film 24 is disposed thereon to bond.

As the metal sheet 20, a metal plate material such as aluminum, stainless steel, magnesium material, or galvanium material may be used.

The resin film 24 adhered to the metal sheet 20 may be formed in advance all the patterns that can be made through a variety of patterns, figures, symbols, numbers, letters or a combination thereof, the patterns described above It can be formed through the same process as the surface decoration process of the resin film layer.

In addition, the resin film 24 uses a thermosetting resin or a thermoplastic resin having a relatively high heat resistance than the pressure-sensitive adhesive.

Next, an adhesive is applied to the upper surface of the decorated resin film 24 to form an adhesive layer 21, and a metal protective film 22 is disposed thereon to be adhered thereto.

The metal protective layer 22 may be formed of a metal plate such as an aluminum plate, a steel sheet, or a stainless plate, and the adhesive of the adhesive layer 21 may be formed of a material having a lower heat resistance than the adhesive forming the adhesive layer 23. That is, the pressure-sensitive adhesive layer 21 selects a material having a low heat resistance that is significantly lower in heat resistance than the metal sheet as well as the adhesive layer 23 and the resin film 24.

Next, the resin film-metal sheet to which the metal protective film 22 is adhered is inserted into a mold to form a specific shape, and then the edge unnecessary portion of the formed metal panel is removed by performing a cutting process along the cutting line 27. do.

At this time, in the cutting process for removing the edge unnecessary part of the metal panel, a burr 28 is generated at the material positioned at the outermost part, that is, at the edge of the metal protective film 22. However, in the cut surface of the metal panel which is located inward from the metal protective film 22, the complete cut surface which does not generate a burr can be obtained.

This is because the high-strength metal protective film 22 sufficiently supports the cutting surface of the metal panel 20 during the cutting process of the edge of the formed metal panel, so that no burr is generated on the cutting surface of the metal panel. Since the cut surface does not require a polishing process through a separate polishing machine, it is possible to reduce the manufacturing labor of the metal panel.

Next, the metal panel formed by the press mold of the metal sheet 20 is heated to a temperature necessary for softening the adhesive layer 21 to soften the adhesive of the adhesive layer 21, and then the metal protective film 22 is removed. By separating, it is possible to obtain a flawless metal panel final product which is press-processed without any damage to any surface decoration including the metal plating layer.

Here, in the press working of the metal sheet 20, the mold molding pressure is increased in the curved portion of the metal sheet formed by the curved portions of the molds 12 and 13, so that pressure is concentrated on the corresponding portion (metal protective film curved portion). Since the silver is entirely covered by the high-strength metal protective film 22, the phenomenon that the surface of the formed metal sheet 20, which is located below the surface, is not damaged.

As described above, the present invention can be safely pressed into a desired shape without damaging the surface of the decorated metal sheet, thereby bringing a unique effect of significantly improving the production yield of the formed metal panel product.

In addition, the present invention can omit the post-treatment polishing process of the surface-decorated metal panel product, resulting in the productivity improvement according to the shortening of the manufacturing labor.

Claims (7)

Decorating a surface through patterns, figures, symbols, numbers, letters, or a combination thereof on the metal sheet; adhering a metal protective film using an adhesive on the decorated metal sheet; Inserting a metal sheet into a mold to form a metal panel having a specific shape, and then removing the unnecessary portion of the edge of the metal panel through a cutting process, by heating the formed metal sheet to soften the adhesive, and then remove the metal protective film Press processing method of a surface-decorated metal panel, characterized in that it comprises a step. Forming a highly heat-resistant thermosetting or thermoplastic resin coating layer on the metal sheet, and decorating a surface by using patterns, figures, symbols, numbers, letters, or a combination thereof on the resin coating layer; Applying an adhesive having a relatively lower heat resistance than the resin coating layer on the resin coating layer, and then sticking the metal protective film, and inserting a metal sheet provided with a decorative resin coating layer adhered to the metal protective film into a mold to form a metal panel having a specific shape. And then removing the unnecessary portion of the edge of the metal panel through a cutting process, and heating the formed metal sheet to soften the low heat resistant adhesive, and then separating the metal protective film from the decorated resin film layer. Press-processing method of the surface-decorated metal panel characterized in that. Applying an adhesive on the metal sheet and then adhering a thermosetting or thermoplastic high heat-resistance resin film having its surface decorated through patterns, figures, symbols, numbers, letters or a combination thereof, the resin on the surface-decorated resin film Applying a lower heat-resistant adhesive than the film, and then attaching a metal protective film thereon, inserting a resin film-metal sheet with a metal protective film in a mold to form a metal panel of a specific shape and then cut through the metal Removing the unnecessary portion of the panel edge; and heating the metal panel having the foamed resin film to soften the pressure-sensitive adhesive and then removing the metal protective film. . The method of claim 1, wherein the metal sheet is any one of aluminum, stainless, magnesium, and galvanium. The surface-decorated metal panel manufactured by the method of claim 1. A surface-decorated metal panel manufactured by the method of claim 2. Surface-decorated metal panel produced by the method of claim 3.

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