KR100895150B1 - Electric home appliance, front cover coupled to home appliance and method for manufacturing front cover - Google Patents

Abstract

The present invention relates to a front cover coupled to a home appliance, a manufacturing method of the front cover, and a home appliance to which the front cover is coupled.

According to the manufacturing method of the front cover and the front cover according to the present invention, even if a process such as forming, punching or drawing is performed on the steel plate on which the pattern is expressed, the pattern is not crushed or damaged.

Washing machine, dryer, front cover

Description

Home appliance, front cover coupled to home appliance and method for manufacturing front cover

The present invention relates to a front cover coupled to a home appliance, a manufacturing method of the front cover, and a home appliance to which the front cover is coupled.

Generally, home appliances refer to electric appliances used in homes, and examples thereof include a washing machine, a dryer, a dishwasher, a refrigerator, and an air conditioner.

Meanwhile, a washing tub for storing laundry is provided in the washing machine and the dryer of the home appliances. The washing tub is selectively opened and closed by a door.

In detail, the washing machine or dryer combines a cabinet and a front cover provided on the front of the cabinet to form an exterior. The door is rotatably mounted to the front cover.

Recently, consumer electronics devices are on the rise in pursuit of high quality through not only function enhancement but also high quality and diversification of design.

As a means for providing such high-quality home appliances, a product in which an image using a silk screen printing technique is expressed on a front cover that forms the front of the product has appeared.

Meanwhile, in the case of the front cover, drawing, punching and forming processes are performed on a pre-coated metal. However, the cracks or scratches of the image are generated by the impact generated during the drawing, punching or forming process on the steel sheet on which the image is expressed.

The present invention has been proposed to solve the above problems, and an object of the present invention is to provide a front cover and a method of manufacturing the front cover to prevent the crack or breakage of the design painted on the front cover surface during the manufacturing process of the front cover. do.

In addition, an object of the present invention is to provide a home appliance in which the front cover is combined.

Method for manufacturing a front cover according to an embodiment of the present invention for achieving the above object, the step of forming a pattern on the one surface of the steel sheet using the silk screen method; Processing the steel plate on which the pattern is formed into a front cover shape; A primer coating process that helps adhesion of the coating liquid to the surface of the processed front cover; and coating the surface of the processed front cover so that the pattern is maintained without breaking even in a bent portion formed in the processing of the front cover. Process is included.

In addition, the present invention further includes a front cover formed by the front cover manufacturing method.

In addition, the present invention further includes a washing machine coupled to the front cover formed by the front cover manufacturing method.

In addition, the present invention further includes a dryer coupled to the front cover formed by the front cover manufacturing method.

By the manufacturing method of the front cover and the front cover according to the present invention constituting the configuration as described above, even if a process such as forming, punching or drawing is performed on the steel plate on which the pattern is expressed, the effect that the pattern is not crushed or damaged does not occur There is.

Accordingly, the front cover can be manufactured while the circular image is maintained, thereby providing a high quality home appliance.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the spirit of the present invention is not limited to the embodiments presented, and other embodiments included within the scope of other inventive inventions or the scope of the present invention can be easily made by adding, changing, or deleting other elements. I can suggest.

1 is an external perspective view of a washing machine shown as an embodiment of a home appliance to which the front cover according to the spirit of the present invention is coupled.

The idea of the present invention described below reveals that it is applicable to other household appliances such as dryers as well as washing machines presented.

Referring to FIG. 1, the washing machine 10 having the idea of the present invention includes a cabinet 11 forming an exterior, a front cover 12 coupled to a front surface of the cabinet 11, and the front cover 12. Door 14 is rotatably coupled to the front surface of the control panel, a control panel 13 provided above the front cover 12 and a detergent box 15 provided on the side of the control panel 13. do. The cabinet 11 is provided with a tub in which a washing tub is formed, and a drum accommodated in the tub and rotating.

In addition, the front cover 12 is characterized in that the pattern by the silk screen technique is expressed on a colored steel plate painted in a chromatic color. However, the present invention is not limited to colored steel plates painted in achromatic colors, and it is also found that the pattern is directly expressed on an unpainted stainless steel material.

In the case of the washing machine 10 having the above configuration, first, a pattern is formed on the front cover 12, and a groove and a hole for the door 14 are coupled to each other. Then, the door 14 is mounted on the completed front cover 12. In addition, the front cover 12 on which the door 14 is mounted is coupled to the front surface of the cabinet 11. Of course, the assembly of the tub, the drum and the drive motor for driving the drum in the cabinet 11 is completed before.

Hereinafter, a structure and a manufacturing method of the front cover 12 will be described in more detail with reference to the accompanying drawings.

2 is an external perspective view showing a front cover of a home appliance according to the spirit of the present invention.

Referring to Figure 2, both ends of the front cover 12 according to the present invention is formed with a curved portion 121 that is smoothly curved by the drawing process. In addition, a door seating portion 122 for recessing the door 14 is recessed to a predetermined depth inside the front cover 12. In addition, the door seating portion 122 has an input hole 123 for introducing laundry.

In detail, the door seating portion 122 is recessed to the rear by a forming process, and the injection hole 123 is cut in a circular state by a trimming process.

In addition, one side of the door seating portion 122 is provided with a door hinge coupling portion 124 for the door hinge is coupled, the door hinge coupling portion 124 is also formed by a punching and trimming process.

In addition, a locker insertion hole 125 is formed in the door seating portion 122 at the point opposite to the door hinge coupler 124, and a locker protruding from the rear edge of the door 14 is inserted.

In addition, a service cover hole 126 for coupling a service cover (not shown) is formed below the front cover 12. In detail, the service cover is rotatably coupled to the service cover hole 126, and the drain pump is exposed when the service cover is opened. Therefore, when the washing is completed, the user can open the service cover to remove the remaining water in the drain pump.

3 is a flowchart schematically illustrating a front cover manufacturing process according to the spirit of the present invention. Hereinafter, a PCM steel sheet (Pre-coated metal) will be described as a preferred embodiment. Here, the color steel sheet (PCM) refers to a colored steel sheet coated with various resins such as polyester, silicon polyester, and fluorocarbon resin on both or both surfaces of the metal sheet.

Referring to FIG. 3, the front cover 12 according to the present invention includes a pattern forming process (S10) of largely coloring a pattern on the front surface, and a front cover forming process (S20) of forming a patterned PCM steel sheet according to a product structure. And, primer coating step (S30) for the coating solution to adhere well to the front cover 12, coating step (S40) to prevent the pattern formed on the front cover 12 is broken, and drying to dry the coating surface The process is completed through a cooling process S60 for cooling the process S50 and the coated front cover 12. By performing each of the above processes, various types of patterns are formed on the surface of the front cover 12 without cracking. The drying process (S50) and the cooling process (S60) is performed in the same manner as the drying and cooling process applied to the pattern coloring process (S120) to be described later.

In addition, the coating process (S40) is also referred to as a clear (clear) process, the coating process is performed to increase the gloss of the front cover surface and prevent the phenomenon that the pattern is peeled off.

In detail, the coating process S40 is a process of coating a transparent slime paste on the surface of the front cover on which the sheet metal process is completed, and passing the front cover through a feeding roller disposed on the upper and lower surfaces thereof. The paste is applied to the surface of the film to a certain thickness.

The paint used in the primer process and the coating process is a two-component acrylic urethane series in which a paint, a curing agent and a thinner are mixed at a predetermined ratio, and the paint mixture is a steel plate with an air pressure of 3-5 kg / cm ³ at a distance of 20-30 cm from the surface to be coated. To be sprayed on.

On the other hand, by performing the coating step (S40) after the front cover molding step (S20) for molding a PCM steel sheet to the front cover of the desired shape, the cracking or peeling of the pattern generated in the front cover molding process is completely Removed.

 Applicants of the present invention confirmed the occurrence of cracks in the pattern or peeling of the edge coating film in the case where the front cover molding process is performed after the coating process and before the coating process, and the experimental results are shown in the table below. Same as

As shown in the table below, when the front cover forming process is performed after the coating process, it was confirmed that the pattern is broken or the peeling phenomenon of the corner portion of the front cover occurs.

On the other hand, when the coating process is performed after the front cover molding process, it could be confirmed that the pattern breakage phenomenon hardly occurs.

1 Cycle 2.5 Cycle 4 Cycle Sheet Metal Clear Sample 1 OK NG (Corner edge peeling) Sample 2 NG (Corner edge peeling) NG (Corner edge peeling) Sample 3 OK NG (Corner edge peeling) Sample 4 NG (Corner edge peeling) NG (Corner edge peeling) Sample 5 OK NG (Corner edge peeling) Sample 6 OK NG (Corner edge peeling) Sample 7 OK NG (Corner edge peeling) Sample 8 OK OK After Sheet Metal Clear Sample 1 OK OK NG (Corner edge peeling) Sample 2 OK OK OK Sample 3 OK OK OK Sample 4 OK OK NG (Corner edge peeling)

(1) Test item: cold and heat test

(2) Test conditions: 6 hours at 70 degrees Celsius per cycle, 6 hours at minus 20 degrees

4 is a flowchart illustrating a process of forming a pattern on the front cover.

Referring to Figure 4, the base color coloring process (S110) of applying the base color of the product on the surface of the PCM steel plate, the pattern coloring process (S120) for coloring a predetermined pattern on the surface of the steel plate colored the base color, and colored A film coating process (S130) for coating a synthetic resin protective film for preventing the pattern from being scratched in the conveying process is performed.

Here, the film coating step (S130) is a laminating step of coating a synthetic resin protective film on the surface of the steel plate with the pattern is completed, by bonding the thin film of the synthetic resin film to the printed surface of the steel sheet to be maintained in a vacuum state, To minimize damage to the printing surface during the transport and transfer of the color steel sheet.

On the other hand, without the base color coloring process (S110) it can be performed to perform a pattern coloring process (S120) directly on the surface of the colored PCM steel sheet.

According to the pattern forming step (S10) as described above, by repeatedly performing the drying and cooling steps several times, there is an effect that the dye printed on the surface of the steel sheet is firmly fused to maintain excellent durability. In addition, even if a drawing process, a forming process or a punching process is performed while the pattern is printed, there is an advantage that the crack or scratch of the pattern does not occur.

Fig. 5 is a flowchart illustrating the steps for coloring the pattern on the surface of the front cover in detail.

Referring to FIG. 5, a silk screen printing technique is applied to form a pattern of a desired shape on the PCM steel sheet itself or the PCM steel sheet colored with the base color.

The pattern forming process as used in the present invention refers to an overall process for expressing a specific shape or shape on the surface of a steel sheet.

In detail, the PCM steel sheet has a high hardness as a colored coated steel sheet. Therefore, when the pattern is formed by applying the silk screen printing technique to the PCM steel sheet, there is an advantage that the pattern is not broken in a post process by giving an elongation to the printed layer.

Silk screen printing is used for the pattern coloring, and by repeating the single color printing (or 1 degree printing) S121 which causes a single color to be printed on the surface of the steel sheet, the pattern of the desired shape is printed on the surface of the steel sheet. .

More specifically, for printing 1 degree, a screen in which a dot is selectively formed is closely adhered to the surface of the steel sheet according to the desired shape of the drawing. In this state, the first monochromatic dye is added and the squeegee is transferred back and forth on the screen. Then, the dye passes through the dots formed on the screen and is printed 1 degree on the surface of the steel sheet.

Then, a drying process (S122) of drying the steel sheet subjected to the first degree printing process is performed.

In detail, the dye-printed steel sheet is dried at a temperature of 100 degrees Celsius or more so that the dye is firmly fused to the surface of the steel sheet. Here, when the drying temperature is lower than 100 degrees, the drying of the dye is poor and the dye is not completely fused to the surface of the steel sheet occurs. Therefore, the dry temperature must be 100 degrees Celsius or more, and preferably in the range of 150 degrees to 400 degrees.

When the drying process is completed, a cooling process (S123) for cooling the dried steel sheet is performed.

In detail, the steel sheet subjected to the drying process is forcedly cooled in the range of -10 degrees to 40 degrees Celsius by using a cooling means such as an air conditioner. In more detail, the surface temperature of the steel sheet subjected to the drying process is high, and in the state where the surface temperature of the steel sheet is high, complete drying of the painted dye cannot be guaranteed, and it is not certain whether the dye is completely fused to the surface of the steel sheet. . Therefore, since the complete drying of the steel sheet is secured through the cooling process, there is an advantage that the next process proceeds quickly.

In addition, a single color printing (2 degree printing) process of applying different types of single colors depending on whether the pattern is completed (S124) is repeatedly performed.

In detail, the first printing and drying process is in close contact with the screen of the screen used in the first degree printing and another screen in which the halftone of the pattern having the seriality is formed. Then, two colors are expressed on the steel sheet while going through the same process as the first degree printing.

By repeating the single color printing process as described above, the desired shape can be expressed on the surface of the steel sheet.

On the other hand, when the desired pattern is completed through a plurality of printing process as described above, the finished pattern through the film coating process (S130) is to be protected from external impact or scratches. Then, the film is removed before the front cover molding step (S20).

6 is a flowchart showing in time series the forming process of the front cover according to the spirit of the present invention.

Referring to FIG. 6, after the pattern forming process, various steps of the post-treatment process are performed on the PCM steel plate having the pattern on the front surface thereof, thereby forming the completed front cover.

In detail, the front cover molding process (S20) according to the present invention includes a notching and trimming process (S201) for cutting corner portions of the PCM steel plate having a pattern formed therein and forming holes for inputting laundry of a predetermined size. Forming process (S202) for forming a door seating portion having a diameter larger than the hole formed through the trimming process, the drawing step (S203) to allow the edge portion of the steel sheet on which the door seating portion is formed with a predetermined curvature, and the drawing A trimming step (S204) of cutting a portion of the flange to which the step (S203) is not applied to an appropriate length, a flange down step (S205) of straightening the flange portion cut through the trimming step (S204), Punching process (or piercing process) (S206) for forming a hole for the fastening member to penetrate the flange portion and the flange portion formed with the fastening member through hole The bending cam (cam bending) process (S207) to bend to the inside of the coherent cover 12 is included.

Through a process as described above, a steel plate colored in a pattern is completed with one complete front cover, and in the following, each process described above will be described in more detail with reference to the accompanying drawings.

7 is a flowchart illustrating an embodiment of a drawing process applied in the front cover manufacturing process according to the spirit of the present invention.

Referring to FIG. 7, a drawing process is performed to smoothly curve the edge portion of the front cover 12 according to the present invention at a predetermined curvature.

In detail, the edge of the front cover 12 is gently curved by the drawing process, the appearance of the washing machine or dryer to which the front cover 12 is coupled is neatly processed to give a luxurious feeling.

More specifically, the drawing process includes a plain push-through drawing and an inverted drawing. In the present embodiment, the plane push-through drawing will be described.

First, in the plane push-through drawing process, a support 21 supporting both ends of the front cover 12 and a pressing member 22 for smoothly bending the front cover 12 while being inserted between the supports 21 are provided. Ready

In detail, the support 21 supports both ends of the front cover 12, that is, a portion to be curved, and the pressing member 22 is indented between the supports 211. When the pressing member 22 is completely indented, both ends of the front cover 12 are curved at a predetermined curvature, and the center portion is kept flat. And, the curvature of both ends of the front cover 12 is formed differently according to the indentation depth of the pressing member 22.

8 is a flowchart illustrating another embodiment of a drawing process applied in a front cover manufacturing process according to the spirit of the present invention.

In detail, the inverted drawing process will be described in the present embodiment.

The inverted drawing process is performed as opposed to the plain push-through drawing, wherein the central portion of the front cover 12 is supported by the support 31, and both ends are pressed by the pressing member 32.

In other words, in a state where the support 31 protrudes upward and is fixed, the pressing member 32 descends while pressing both ends of the front cover 12. Then, the support 31 moves relative to the pressing member 32 and is indented between the pressing members 32.

By the above working process, both ends of the front cover 12 are curved at a predetermined curvature.

9 is a process diagram illustrating a notching and trimming process and a forming process in the post-processing process of the front cover, and FIG. 10 is a cross-sectional view taken along line II ′ of FIG. 9.

Referring to FIG. 9, through the notching process of cutting a corner portion of a steel sheet on which a pattern is formed, the phenomenon of wrinkles may be minimized by removing a portion of the steel sheet at the corner portion by drawing the material toward the corner in a drawing process to be described later. Then, a hole having a size smaller than the size of the laundry input hole required inside the steel sheet is formed. In addition, the notching and trimming may be simultaneously performed in a single process.

Meanwhile, in the trimming process, the size of the laundry input hole 123 is formed to be smaller than the diameter of the input hole required in the front cover completion step. Thereafter, a forming process S202 is performed in which the laundry input hole 123 is recessed to a predetermined depth so that the door seating part 122 is formed. Then, the steel sheet is depressed while forming in the forming process, the laundry input hole 123 is larger than the initial hole diameter. And, the laundry input hole 123 is expanded to a size corresponding to the outer diameter of the door glass provided on the back of the door of the washing machine or dryer. The door seating portion 122 is formed to have a size corresponding to the outer diameter of the door.

When the pattern is formed by the method as described above, there is an advantage that the pattern is formed without cracks in the bent portion, such as the corner portion of the door seating portion or the front cover.

Referring to FIG. 10, after the notching and trimming processes are performed on the PCM steel sheet, the laundry input hole 123 is recessed to a predetermined depth to form the door seating part 122. Then, the outside of the door seating portion is maintained in a flat state.

FIG. 11 is an external perspective view illustrating a state where the edge portion of the front cover is curved at a predetermined curvature through the drawing process, and FIG. 12 is a cross-sectional view taken along line II-II 'of FIG. 11.

11 and 12, a drawing process S203 is performed to smoothly curve the edges of the front cover 12 after the notching and trimming and forming processes are performed.

In detail, the slope of the steel sheet is smoothly curved by using any one of the drawing methods shown in FIG. 7 or 8. That is, the pressing member 32 having the same cross section as the size of the front cover 12 is to press the steel sheet. Then, the curved portion 127 is formed to be curved at a predetermined curvature while the edge portion of the steel sheet is recessed.

More specifically, the holder 33 is used in the drawing process to hold the edge of the steel sheet. Then, the curved portion 127 is smoothly curved to a predetermined radius of curvature R in the drawing process. The portion supported by the holder 33 is kept flat to form the flange 128. In addition, the flange 128 is bent inward of the front cover 12 in the final process, and is in close contact with the cabinet front of the washing machine or dryer. Then, the flange 128 is fixed to the front of the cabinet by a fastening member.

Here, in order to prevent the peeling of the film film coated on the surface of the steel sheet by the contact of the support and the steel sheet during the drawing process, the protection of the PE-based or PVC-based on the surface of the support (or mold) Film films may be formed.

13 is a cross-sectional view showing a part of the flange is cut by a trimming process performed after the drawing process.

Referring to FIG. 13, after the drawing process S203 is performed, a trimming process S204 of cutting out a portion of the flange 128 is performed.

In detail, the edge portion of the flange 128 is cut out through the trimming process S204 so that the edge portion of the front cover 12 is neatly arranged.

As shown in FIG. 11, when the drawing process S203 is performed, the edge portion is pushed inward while the steel sheet is stretched. In addition, the edge portion of the steel sheet is not deformed by the tensile force acting in opposite directions on two adjacent surfaces of the steel sheet. Rather, a part of the material is concentrated to four corner portions by the deformable forces acting in opposite directions on two adjacent surfaces, and the edge portions are wrinkled. And, the edge portion of the steel sheet is formed to protrude compared to the other portion.

By the trimming process (S204) which cut | disconnects the site | part which such shape deformation generate | occur | produced, the edge part of the front cover 12 is arrange | positioned smoothly.

14 is a cross-sectional view illustrating a flange down process of the post-treatment process of the front cover according to the spirit of the present invention.

Referring to FIG. 14, when the trimming process S204 shown in FIG. 12 is completed, a flange down straightening the flange 128, which is maintained at the end of the curved portion 127 in a bent state, to a rear surface thereof. Process S205 is performed.

In detail, the flange down process is a process before cam bending, which will be described later, in which the flange is bent into the front cover 12 in two steps.

More specifically, in the flange down process, the mold is brought into close contact with the inside of the front cover, and the pressing member is lowered from the upper surface of the flange. That is, the pressing member is pressed to open the flange, so that the opened flange is in close contact with the surface of the mold in close contact with the inside of the front cover 12. Then, the flange is straightened at the end of the curved portion 127.

15 is a cross-sectional view showing a punching process for forming a bolt fastening hole during the post-treatment process of the front cover according to the spirit of the present invention.

Referring to FIG. 15, a punching process (S206) for inserting a bolt into a flange straightened to the rear of the front cover 12 is further performed by the flange down process.

In detail, in the illustrated state, the bolt fastening hole is formed using a punching mechanism on the outer side of the front cover 12.

16 is a cross-sectional view showing a cam bending process of the post-treatment process of the front cover according to the spirit of the present invention.

Referring to FIG. 16, after the punching process S206 is performed, a cam bending process S207 is performed to allow the flange 128 to be bent in the center direction of the front cover 12.

In detail, the flange 128 is bent in the direction of the center of the front cover 12, so that the front cover 12 is fixed in close contact with the front of the home appliance, such as a washing machine or dryer.

In more detail, the flange 128 is bent by the cam bending process S207, and the flange 128 is in close contact with the front surface of the cabinet 11 forming the exterior of the washing machine or the dryer. The cam bending process is equally applied to all flanges 128 formed on the slopes of the front cover 12. In other words, the upper and lower cam bending and the upper and lower cam bending are performed sequentially.

Here, the edge portion of the front cover 12 is folded in the flange down process before the cam bending process is performed. Therefore, the process of cutting out the material folded in the corner portion will have to be preceded. That is, in the cam bending process, the flanges of the upper or lower edge portion and the side edge portion that are folded inwardly are cut to a size that does not interfere with each other.

In addition, a punching process for forming a bolt fastening hole may be first performed before the flange down process is performed. In addition, the flange down process and the cam bending process can be performed at once. In other words, the flange down process and the cam bending process may be performed at once so that the flange portion is turned 180 degrees. In this case, the process of cutting out the edge portion of the front cover 12 will have to be preceded before the flange down process is performed.

1 is an external perspective view of a washing machine showing as an embodiment of a home appliance with a front cover according to the spirit of the present invention.

Figure 2 is an external perspective view showing a front cover of a home appliance according to the spirit of the present invention.

3 is a flowchart schematically illustrating a front cover manufacturing process according to the spirit of the present invention.

4 is a flow chart showing a process of forming a pattern on the front cover.

Fig. 5 is a flow chart illustrating the process for coloring the pattern on the surface of the front cover in detail.

FIG. 6 is a flowchart showing in time series a forming process of a front cover according to the spirit of the present invention; FIG.

7 is a flowchart illustrating an embodiment of a drawing process applied in the front cover manufacturing process according to the spirit of the present invention.

8 is a flowchart showing another embodiment of a drawing process applied in the front cover manufacturing process according to the spirit of the present invention.

9 is a process chart showing a notching and trimming process and a forming process of the post-treatment process of the front cover.

FIG. 10 is a cross-sectional view taken along line II ′ of FIG. 9;

11 is an external perspective view showing a state where the edge portion of the front cover is curved with a predetermined curvature through a drawing process.

12 is a cross-sectional view taken along the line II-II 'of FIG. 11;

13 is a cross-sectional view showing a part of the flange is cut by a trimming process performed after the drawing process.

14 is a cross-sectional view showing a flange down process during the post-treatment process of the front cover according to the spirit of the present invention.

15 is a cross-sectional view showing a punching process for forming a bolt fastening hole during the post-treatment process of the front cover according to the spirit of the present invention.

16 is a cross-sectional view showing a cam bending process of the post-treatment process of the front cover according to the spirit of the present invention.

<Description of the symbols for the main parts of the drawings>

10: washing machine 11: cabinet

12: front cover 13: control panel

14 door 15 detergent box

Claims (20)

Forming a pattern on one surface of the steel sheet using a silk screen method; Processing the steel plate on which the pattern is formed into a front cover shape; Primer coating process to help the adhesion of the coating liquid on the surface of the processed front cover; And And coating the surface of the processed front cover so that the pattern is maintained without cracking even in the bent portion formed in the front cover processing step. delete The method of claim 1, At least one of the coating solution and the primer is a front cover manufacturing method comprising a two-component acrylic urethane-based mixed paint. The method of claim 1, In the step of forming the pattern, Patterned coloring process, The front cover manufacturing method including the film film process which coats a protective film on the surface of the patterned steel plate. The method of claim 4, wherein Before the processing step, a process for removing the coated film is carried out, characterized in that the front cover manufacturing method. The method of claim 4, wherein The base cover manufacturing method further comprises a base color coloring process that is optionally performed before the pattern coloring process. The method of claim 4, wherein In the pattern coloring process, (a) a single color printing process of screen printing a pattern using a dye of a single color on the surface of the steel sheet, (b) a drying process for drying the steel sheet printed with a single color; and (c) a cooling step of cooling the dried steel sheet, The method of manufacturing a front cover, characterized in that the steps (a) to (c) are repeatedly performed until the desired shape of the pattern is completed. The method of claim 1, A drying process performed after the coating process is completed and drying the front cover; A front cover manufacturing method further comprising a cooling step of cooling the dried front cover. The method according to any one of claims 7 to 8, Method for producing a front cover, characterized in that the drying temperature ranges from at least 100 degrees Celsius to 400 degrees Celsius. The method according to any one of claims 7 to 8, Method for producing a front cover, characterized in that the cooling temperature ranges from -10 degrees to 40 degrees Celsius. The method of claim 1, In the processing process A notching and trimming process of cutting a corner portion of the steel plate on which a pattern is formed, and forming a hole for putting laundry into the inside, A forming process of forming a door seating portion having a diameter larger than that of the hole formed through the trimming process; A drawing process for bending an edge portion of the steel plate on which the door seating portion is formed to a predetermined curvature; A trimming process of cutting a portion of the flange to which the drawing process is not applied to a predetermined length; A flange down process of extending the flange portion cut through the trimming process; A punching process (or piercing process) for forming a hole for the fastening member to penetrate the flange portion; And a cam bending process of bending the flange portion in which the fastening member through-hole is formed inward. The method of claim 11, The drawing process includes a plane push-through drawing or inverted drawing. The method of claim 11, The flange cover process, the punching process and the bending process sequence of the front cover, characterized in that the switchable. The method of claim 11, The flange down process and the bending process is the front cover manufacturing method characterized in that it can be carried out continuously. The method of claim 1, The steel sheet includes a PCM (Pre-Coated Metal) or stainless steel front cover manufacturing method. delete A front cover manufactured by the method of claim 1. The method of claim 17, The front cover, characterized in that the pattern is also formed in the valleys formed in the steel sheet processing step. A washing machine incorporating a front cover manufactured by the method of claim 1. Dryer with a front cover manufactured by the method of claim 1.

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