KR20110005584A - Injection mold manufacturing method and synthetic resin product manufacturing method - Google Patents

Abstract

The present invention relates to an injection mold manufacturing method for manufacturing an injection mold for producing a synthetic resin product by injection molding, and a synthetic resin product manufacturing method for manufacturing a synthetic resin product by injection molding with the injection mold produced thereby. An injection mold manufacturing method for manufacturing an injection mold for injection molding a synthetic resin product including a curved surface portion having a pattern is formed by forming a photoresist pattern on a substrate having electrical conductivity, and performing pre-plating on the substrate on which the photoresist pattern is formed. Forming a curved metal part on the substrate by forming a desired metal pattern on the substrate, pressing the substrate on which the metal pattern is formed, and forming a curved part on the substrate; Forming a mother master by implanting, performing pre-plating on the mother master to form a molding core having a pattern opposite to the metal pattern, and inserting the molding core into a mold structure to form an injection mold It includes a step. According to the present invention, an injection mold capable of injection molding a synthetic resin product including a curved portion having a desired pattern may be manufactured.

Description

Injection mold manufacturing method and synthetic resin product manufacturing method {METHOD FOR FORMING INJECTION MOLD AND METHOD FOR MANUFACTURING SYNTHETIC RESIN PRODUCT}

The present invention relates to an injection mold manufacturing method for manufacturing an injection mold for producing a synthetic resin product by injection molding, and a synthetic resin product manufacturing method for manufacturing a synthetic resin product by injection molding with the injection mold produced thereby.

As information and communication devices such as mobile phones are widely used, users' demand for aesthetic appearance of these products is also increasing.

In the past, attempts have been made to enhance aesthetics by putting hairlines and various patterns into cases or parts of products such as mobile phones.

Conventionally, a metal case or a part thereof is mainly used, and it is very difficult to form various patterns on such a metal material, and there is a high manufacturing cost problem.

Due to these problems, there is a need for a technology capable of replacing a case or a part of a mobile phone with a synthetic resin product and forming various kinds of patterns on the surface thereof.

The present invention has been made to solve the problems described above, the problem to be solved by the present invention is to produce a synthetic resin product capable of forming a fine and precise pattern, and in particular can form a desired pattern on curved or curved parts It is to provide an injection mold manufacturing method and a synthetic resin manufacturing method using the same.

An injection mold manufacturing method for manufacturing an injection mold for injection molding a synthetic resin product including a curved surface portion having a pattern according to an embodiment of the present invention for achieving the above object, to form a photosensitive agent pattern on a substrate having electrical conductivity And forming a desired metal pattern on the substrate by performing pre-plating on the substrate on which the photoresist pattern is formed, and performing a press process on the substrate on which the metal pattern is formed to form a curved portion on the substrate. Forming a mother master by implanting the substrate on which the curved portion is formed to a metal structure so that the pattern is exposed to the outside, and forming a molding core having a pattern having a shape opposite to the metal pattern by performing pre-plating on the mother master And inserting the molding core into a mold structure to form an injection mold. And a step of sex.

In the forming of the metal pattern, electroplating may be performed to completely cover the photoresist pattern.

On the other hand, the injection mold manufacturing method for manufacturing an injection mold for manufacturing a synthetic resin product comprising a curved surface portion formed pattern according to another embodiment of the present invention, the electrical conductivity to include a curved portion corresponding to the shape of the synthetic resin product CNC machining the substrate, forming a photoresist pattern on the substrate including the curved portion, and performing pre-plating on the substrate on which the photoresist pattern is formed to form a desired metal pattern on the substrate. Implanting the substrate on which the curved portion is formed to be exposed to the metal structure to form a mother master, subjecting the mother master to electroplating to form a molding core having a pattern opposite to the metal pattern; and Inserting the molding core into a mold structure to form an injection mold And a system.

In the forming of the metal pattern, electroplating may be performed to completely cover the photoresist pattern.

The forming of the photoresist pattern may include forming a photoresist layer on the substrate on which the curved portion is formed, and performing ultraviolet light exposure on the photoresist layer to cover the photosensitive film having a shape corresponding to the shape of the curved portion. Partially curing, and removing an uncured portion of the photoresist layer.

The forming of the photoresist pattern may include forming a photoresist layer on the substrate on which the curved portion is formed, and forming a vacuum in a space between the photoresist layer and the photoresist film while covering the photoresist film on the photoresist layer to form the photoresist film. Contacting the photoresist layer and performing ultraviolet exposure to partially cure the photoresist layer, and removing the uncured portion of the photoresist layer.

Meanwhile, an injection mold manufacturing method for manufacturing an injection mold for manufacturing a synthetic resin product including a curved surface portion having a pattern according to another embodiment of the present invention may include electrical conductivity to include a curved portion corresponding to the shape of the synthetic resin product. CNC machining a substrate having a substrate, forming a pattern on the substrate on which the curved portion is formed by tooth machining, and then performing pre-plating to form an intermediate substrate on which a desired metal pattern is formed. The metal pattern is exposed to the outside. Implanting the intermediate substrate into a metal structure to form a mother master, performing pre-plating on the mother master to form a forming core having a pattern opposite to the metal pattern, and molding the forming core Inserting into the structure to form an injection mold.

The forming of the intermediate substrate may be performed by forming some patterns of the patterns on the substrate on which the curved portion is formed by dental processing, and forming a structure having an opposite shape by performing pre-plating using the substrate on which the patterns are formed. Repeating the taste process of forming some other patterns on the structure by dental machining to form a preceding intermediate substrate having the opposite shape of the desired final product, and pre-plating using the preceding intermediate substrate to carry out the metal pattern. It may include forming an intermediate substrate having a.

On the other hand, the synthetic resin product manufacturing method for producing a synthetic resin product comprising a curved surface portion formed pattern according to an embodiment of the present invention is carried out injection molding using the injection mold manufactured by any one of the injection mold manufacturing method described above To shape the synthetic resin product having the desired pattern.

According to the present invention, an injection mold capable of injection molding a synthetic resin product including a curved portion having a desired pattern may be manufactured.

In addition, by forming the metal pattern corresponding to the desired pattern by electroplating and forming an injection mold based on this, it is possible to form a pattern of finer and more precise synthetic resin products.

In addition, by forming a curved portion corresponding to the curved shape of the synthetic resin product by press working or CNC machining, the synthetic resin product having a pattern formed on the curved surface can be easily manufactured through injection molding.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

An injection mold product manufacturing method according to an embodiment of the present invention is an injection mold manufacturing method for manufacturing a synthetic resin product that can form a desired pattern on a synthetic resin product having a curved portion, the synthetic resin product manufacturing method according to an embodiment of the present invention It is a method of manufacturing a synthetic resin product through injection molding using an injection mold manufactured by an injection mold manufacturing method according to an embodiment of the present invention. Here, the pattern may be any pattern such as a recessed pattern formed by recesses having a desired shape, and the synthetic resin products may be polyester (PET) products, polycarbonate (PC) products, and ABS (Acrylonitrile). Butadien Styre), and may be made of any synthetic resin, such as polycarbonate and ABS mixed products.

For example, a synthetic resin product having such a pattern may be used as a case of various kinds of products such as a mobile phone and a portable multimedia player (PMP).

First, an injection mold manufacturing method according to an embodiment of the present invention will be described with reference to FIG. 1.

First, as shown in FIGS. 1A and 1B, a photosensitive pattern 103 is formed on a substrate 101 having electrical conductivity. In this case, the substrate 101 may be formed of a metal material having electrical conductivity, for example, stainless steel.

As shown in FIG. 1A, a black light blocking unit 109a and transparent light are formed on the entire upper surface of the substrate 101 and then block light according to a predetermined pattern thereon. The passage 109b covers the film 109 formed. Then, ultraviolet (UV) is irradiated onto the film 113. As a result, the portion of the photosensitive agent layer 105 immediately below the black light blocking portion 109a of the film 109 is not cured, but is cured by ultraviolet rays directly below the transparent light passing portion 109b of the film. In this state, the photoresist pattern 103 can be formed on the substrate 101 by removing the uncured portion by a conventionally known method as shown in FIG.

The photoresist layer 105 may be a known photoresist that may be cured by ultraviolet light, and curing by ultraviolet exposure, and removal of the uncured photoresist layer may be performed by a conventional method known in the art. Omit.

Then, as illustrated in FIG. 1C, pre-plating is performed on the substrate 101 on which the photoresist pattern 103 is formed to form a desired metal pattern 111 on the substrate 101. For example, the metal pattern 111 may be formed by performing electroplating with nickel (Ni).

In this case, when the metal pattern 111 is formed by performing electroplating, electroplating may be performed so that the photoresist pattern 103 is completely covered. As such, when the electroplating is performed, grooves are formed in a portion where the photoresist pattern 103 is not formed, and the grooves correspond to the metal pattern 111.

Then, as shown in (d) of FIG. 1, a press working is performed on the substrate 101 on which the desired metal pattern 111 is formed to form a curved portion on the substrate 101. In the drawing, an example in which the entirety of the substrate is formed as a curved surface is illustrated, but a curved portion may be formed near the outer edge of the substrate and the center portion thereof may be flat.

Then, as shown in (e) of FIG. 1, the mother substrate 115 is formed by implanting the substrate 101 having the curved portion formed into the metal structure 113. Here, as shown in the figure, the depressions 114 are provided in the metal structure 113 and the substrate 101 is implanted in the depressions 114 by inserting the substrate 101 into the depressions 114. Can be. In this case, the substrate 101 is implanted into the metal structure 113 in a state in which the metal pattern 111 is exposed to the outside.

The metal structure 113 may be formed of a metal material having good electrical conductivity, and may be formed of, for example, brass.

Then, by performing pre-plating on the mother master 115, a forming core 119 having a pattern 117 having a shape opposite to that of the metal pattern 111 of the substrate 101 is formed. That is, the preform plating may be performed on the metal pattern 111 of the substrate 101 of the mother master 115 and then separated from the mother master 115 to form the forming core 119.

At this time, the electroplating may be performed to have a sufficient thickness so that the forming core 119 can be used for injection molding.

Then, as shown in FIG. 1G, the molding core 119 is inserted into the metal structure 121 to form the injection mold 123.

2 is a view showing an injection mold manufacturing method according to another embodiment of the present invention.

First, according to an injection mold manufacturing method according to another embodiment of the present invention, a CNC-machined metal substrate 201 having electrical conductivity is formed to include a curved portion 202 corresponding to the shape of a synthetic resin product to be manufactured. . Accordingly, the substrate 201 having the curved portion 202 is formed as shown in FIG.

Then, as illustrated in FIGS. 2B and 2C, the photosensitive pattern 203 is formed on the substrate 201 including the curved portion 202.

The photoresist pattern 203 may be formed in a similar manner as in FIG. 1 described above. That is, as shown in FIG. 2A, first, the photosensitive layer 205 is formed on the entire upper surface of the substrate 201, and then the black light blocking portion 109a and the transparent light passing portion 109b are formed thereon. The photoresist pattern 203 can be formed by covering the formed photoresist film 109 and then irradiating with ultraviolet light, and then removing portions of the uncured photoresist layer 205.

At this time, according to the embodiment of the present invention, a photosensitive film 209 having a shape corresponding to the shape of the curved portion 202 formed on the substrate 201 as shown in (b) of FIG. 2 is used. Thus, since the ultraviolet light exposure is performed with the photosensitive film layer 205 covering the upper surface with the photosensitive film 209 having a shape corresponding to the shape of the curved portion 202 of the substrate 201, the photosensitive film 209 is a photosensitive agent Ultraviolet light exposure may be performed in a state where the entire surface of the layer 205 is evenly in contact with each other, and thus the desired pattern may be more precisely implemented. That is, when UV exposure is performed using a flat photosensitive film on the substrate 201 including the curved portion 202, a portion between the photosensitive film and the photoresist layer is formed, and the ultraviolet ray is formed in the space therein. There may be a problem that it passes around and passes through to cure undesired portions of the photoresist layer, in which case it becomes difficult to implement a precise pattern. That is, in the embodiment of the present invention, the photoresist layer 205 may be accurately cured according to a desired pattern by performing ultraviolet exposure using the photosensitive film 209 having a shape corresponding to the curved portion 202 of the substrate 201. The final pattern can be precisely formed.

On the other hand, according to another embodiment of the present invention, while the photosensitive film is covered on the photosensitive layer in a state in which the air is forced to discharge the space between the photosensitive layer and the photosensitive film to form a vacuum in a state in which the photosensitive film is in close contact with the photosensitive layer Ultraviolet exposure can be performed. As a result, the photosensitive film may be more closely adhered to the photosensitive agent layer, so that the desired pattern may be more precisely implemented.

After this process, the process may be performed in a similar manner to that after the process of FIG.

That is, as shown in FIG. 2D, pre-plating is performed on the substrate 201 on which the photoresist pattern 203 is formed to form a desired metal pattern 211 on the substrate 201.

At this time, as described above, the electroplating may be performed so that the photoresist pattern 203 is completely covered by the metal layer formed by the electroplating.

Then, as shown in (e) of FIG. 2, the mother master 215 is implanted into the metal structure 213 by implanting the substrate 201 on which the curved portion 202 is formed so that the metal pattern 211 is exposed to the outside. To form.

Then, as shown in FIG. 2F, preforming plating is performed on the mother master 215 to form a forming core 219 having a pattern 217 having a shape opposite to the metal pattern 211. .

Then, the molding core 219 is inserted into the mold structure 212 to form the injection mold 223.

3 is a view showing an injection mold manufacturing method according to another embodiment of the present invention.

First, as shown in FIG. 3A, the metal substrate 301 having electrical conductivity is CNC-processed to include a curved portion 302 corresponding to the shape of the injection mold to be manufactured.

Then, as shown in (b) and (c) of FIG. 3, a pattern is formed on the substrate 301 on which the curved portion 302 is formed through tooth processing, and then a pre-plating process is performed using the desired metal. A patterned intermediate substrate 303 is formed.

More specifically, some patterns 304 of the final patterns are formed on the substrate 301 on which the curved portion 302 is formed through tooth processing, and electroplating is performed by using the substrate 301 on which the partial patterns 304a are formed. Thereby forming a structure 305 of the opposite shape. Accordingly, in the structure of reference numeral 305, a pattern 304b having a shape opposite to some of the patterns 304a previously formed on the substrate 301 is formed.

Then, some other pattern 306a is again formed in the structure 305 having the opposite shape.

In this way, by repeating the taste process as necessary, it is possible to finally form a pattern corresponding to the desired pattern. On the other hand, in Figure 3, after forming a pattern using it to obtain a substrate in the form of the opposite of the electroplating and the process of forming a pattern there again is shown as being repeated once, but the taste process is twice as necessary The above may be repeatedly performed.

Through such repeated pre-plating and taste process, a preceding intermediate substrate 307 having a shape opposite to the final product can be formed, and then pre-plating is performed by using the preceding intermediate substrate 307 as shown in FIG. 3. An intermediate substrate 303 having metal patterns 304a and 306b as shown in (d) of FIG. 2 can be formed. At this time, not only a pattern such as a hairline, but also a hologram may be implanted if necessary.

Then, as shown in FIG. 3E, the substrate 301 having the curved portion 302 formed thereon is implanted into the metal structure 313 so that the metal patterns 304a and 306b are exposed to the outside. 315). In this case, although the case where one substrate 301 is implanted into the metal structure 313 is shown, a plurality of substrates 301 are formed as necessary, and then implanted into one metal structure 313 to the mother It can also form a master.

Then, as shown in FIG. 3 (f), the mother core 315 is subjected to pre-plating to form a forming core 319 having a pattern 317 having a shape opposite to the metal patterns 304a and 306b. Form.

Then, the molding core 319 is inserted into the mold structure 312 to form the injection mold 323.

On the other hand, the synthetic resin manufacturing method according to an embodiment of the present invention to produce a synthetic resin product by injection molding using the injection mold (123, 223, 323) manufactured by the injection mold manufacturing method according to the embodiment of the present invention described above do. In this case, when the opposite injection mold is required for injection molding, after the injection mold is formed in the same manner as above, injection molding may be performed using both.

Although the embodiments of the present invention have been described above, the scope of the present invention is not limited thereto, and it is recognized that the present invention is easily changed and equivalent by those skilled in the art to which the present invention pertains. Includes all changes and modifications to the scope of the matter.

1 is a view showing an injection mold manufacturing method according to an embodiment of the present invention.

2 is a view showing an injection mold manufacturing method according to another embodiment of the present invention.

3 is a view showing an injection mold manufacturing method according to another embodiment of the present invention.

Claims (9)

An injection mold manufacturing method for manufacturing an injection mold for injection molding a synthetic resin product including a curved surface portion having a pattern, Forming a photoresist pattern on the substrate having electrical conductivity, Performing pre-plating on the substrate on which the photosensitive agent pattern is formed to form a desired metal pattern on the substrate; Forming a curved portion on the substrate by pressing the substrate on which the metal pattern is formed; Forming a mother master by implanting the substrate on which the curved portion is formed to a metal structure so that the metal pattern is exposed to the outside; Performing pre-plating on the mother master to form a forming core having a pattern opposite to the metal pattern; and Inserting the molding core into a mold structure to form an injection mold. In claim 1, In the forming of the metal pattern, the injection mold manufacturing method is performed electroplating so that the photoresist pattern is completely covered. An injection mold manufacturing method for manufacturing an injection mold for manufacturing a synthetic resin product including a curved surface portion having a pattern, CNC machining a substrate having electrical conductivity to include a curved portion corresponding to the shape of the synthetic resin product, Forming a photoresist pattern on the substrate including the curved portion; Performing pre-plating on the substrate on which the photosensitive agent pattern is formed to form a desired metal pattern on the substrate; Forming a mother master by implanting the substrate on which the curved portion is formed to a metal structure so that the metal pattern is exposed to the outside; Performing pre-plating on the mother master to form a forming core having a pattern opposite to the metal pattern; and Inserting the molding core into a mold structure to form an injection mold. 4. The method of claim 3, In the forming of the metal pattern, the injection mold manufacturing method is performed electroplating so that the photoresist pattern is completely covered. 4. The method of claim 3, Forming the photoresist pattern is Forming a photoresist layer on the curved surface formed substrate; Partially curing the photosensitive layer by performing ultraviolet light exposure while covering the photosensitive film having a shape corresponding to the shape of the curved portion on the photosensitive layer; Removing the uncured portion of the photoresist layer. 4. The method of claim 3, Forming the photoresist pattern is Forming a photoresist layer on the curved surface formed substrate; Forming a vacuum in the space between the photoresist layer and the photoresist film while covering the photoresist layer to adhere the photoresist film to the photoresist layer, and then performing ultraviolet light exposure to partially cure the photoresist layer. , And Removing the uncured portion of the photoresist layer. An injection mold manufacturing method for manufacturing an injection mold for manufacturing a synthetic resin product including a curved surface portion having a pattern, CNC machining a substrate having electrical conductivity to include a curved portion corresponding to the shape of the synthetic resin product, Forming a pattern on the substrate on which the curved portion is formed by tooth processing, and then performing electroplating to form an intermediate substrate on which a desired metal pattern is formed; Forming a mother master by implanting the intermediate substrate into a metal structure so that the metal pattern is exposed to the outside; Performing pre-plating on the mother master to form a forming core having a pattern opposite to the metal pattern; and Inserting the molding core into a mold structure to form an injection mold. In claim 7, Forming the intermediate substrate Some patterns of the patterns are formed on the substrate on which the curved portion is formed by dental processing, and pre-plating is performed using the substrate on which the patterns are formed to form a structure having the opposite shape, and then other other patterns are processed on the structures. Repeating the taste process formed by to form a preceding intermediate substrate having the opposite shape of the desired final product, and Performing pre-plating using the preceding intermediate substrate to form an intermediate substrate having the metal pattern. A synthetic resin product manufacturing method for manufacturing a synthetic resin product comprising a curved surface portion having a pattern, A method of producing a synthetic resin product, wherein the injection molding is performed by using the injection mold manufactured by the method of manufacturing an injection mold according to any one of claims 1 to 8 to mold a synthetic resin product having the desired pattern.

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