KR20170081816A - method for making mold core used in forming product with curved surface - Google Patents
method for making mold core used in forming product with curved surface Download PDFInfo
- Publication number
- KR20170081816A KR20170081816A KR1020160000720A KR20160000720A KR20170081816A KR 20170081816 A KR20170081816 A KR 20170081816A KR 1020160000720 A KR1020160000720 A KR 1020160000720A KR 20160000720 A KR20160000720 A KR 20160000720A KR 20170081816 A KR20170081816 A KR 20170081816A
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- KR
- South Korea
- Prior art keywords
- block
- metal layer
- relief
- core
- curved surface
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/3842—Manufacturing moulds, e.g. shaping the mould surface by machining
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/3842—Manufacturing moulds, e.g. shaping the mould surface by machining
- B29C33/3857—Manufacturing moulds, e.g. shaping the mould surface by machining by making impressions of one or more parts of models, e.g. shaped articles and including possible subsequent assembly of the parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
- B29C33/60—Releasing, lubricating or separating agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/2602—Mould construction elements
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
A method of manufacturing a mold core of a mold for injection molding a product having a curved surface is disclosed. A method of manufacturing a mold core for molding a curved surface product, comprising the steps of: forming a relief block having a relief surface corresponding to a convex curve surface of a curved surface product; forming a relief surface A core block joining step of fixing the core block to the metal layer, and a core block joining step of separating the corrugated block from the metal layer and forming a concave corrugated surface corresponding to the corrugated surface, And an embossing block separating step of exposing the curved surface.
Description
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an injection mold, and more particularly, to a method of manufacturing a mold core of a mold for injection molding a product having a curved surface.
BACKGROUND OF THE INVENTION [0002] In the field of information communication devices such as smart phones, there are cases where a cover is made in a curved shape in order to facilitate grip, to differentiate a design, or to close a face close to a face during a call. 1A and 1B are cross-sectional views showing an example of a smartphone cover having a curved shape, wherein FIG. 1A is a sectional view taken on a ZX plane, and FIG. 1B is a sectional view taken on a YZ plane.
The smartphone cover (CV) shown in Figs. 1A and 1B shows a curved shape on the YZ plane as well as on the ZX plane. That is, the cover CV is a curved product that extends in a curve in the X-axis direction and extends in a curved line in the Y-axis direction. On the other hand, the smartphone cover (CV) is a product requiring uniform optical characteristics in terms of gloss, transparency and the like, and requires precise polishing and polishing work on the product surface as a post-injection molding process. However, performing additional surface polishing and polishing processes on all products that are injection molded results in decreased productivity and increased production costs.
Accordingly, there has been an attempt to precisely polish and polish the cavity forming surface of the mold corresponding to the shape of the product, and to eliminate the additional product surface polishing and polishing process by injection molding using the mold . In the case where the cavity-forming surface is a convex surface, a person skilled in the art can relatively easily obtain a convex cavity-formed surface with high precision and high gloss by NC (Numerical Control) processing.
On the other hand, if the cavity forming surface is a concave surface extending in a curve only in one of the X-axis direction and the Y-axis direction and extending in a straight line in the other direction, a processing tool in contact with the concave cavity- It is possible to obtain a high-precision, high-gloss cavity-formed surface by polishing while reciprocating only in the direction in which the formed surface extends linearly. However, if the cavity-forming surface is a concave surface extending in a curved line in the X-axis direction and the Y-axis direction, a method of bringing the processing tool into contact with the cavity-forming surface and moving it linearly in one direction provides a high- none.
The present invention relates to a method for producing a mold core for molding a curved product, which is injection-molded by injection molding with a convex curved surface extending in the X-axis direction and the Y-axis direction, to provide.
The present invention also provides a method for producing a mold core for molding a curved product, the cavity forming surface extending in a curved line in the X-axis direction and the Y-axis direction and having a high-precision high-gloss cavity forming surface.
The present invention relates to a method of manufacturing a mold core for injection molding a curved surface article having a convex curved surface, the method comprising the steps of: forming a relief curved surface, Forming a metal layer made of nickel (Ni) or a nickel alloy on a side of the relief surface of the relief block where the relief curved surface is formed so that the relief surface is covered; And a relief block separating step of separating the relief block from the metal layer and exposing a concave depressed curved surface corresponding to the depressed curved surface.
The forming of the embossed block may include forming the embossed curved surface in the embossed block through NC (Numerical Control) processing.
The step of laminating the metal layer may include a step of plating nickel or a nickel alloy on the side surface of the relief block.
The core block bonding step may include a core block forming step of forming a core block having a groove or a dent for hooks formed on at least one side face thereof, a core block closing step of bringing the core block into close contact with the metal layer, And further plating the metal layer in the groove or the dent for the hook with the same metal as the metal layer to form a connecting hook connected to the metal layer and filled in the hook groove or the dent .
The core block bonding step may include a bonding step of bonding the core block to the metal layer with an adhesive made of a synthetic resin.
The method of manufacturing a mold core for molding a curved surface product according to the present invention may further include a step of applying a release promoting material for applying a release promoting material to the side of the embossed block on which the embossed curved surface is formed before the step of laminating the metal layer, The block separating step may include the step of applying an external force in a direction in which the metal layer and the relief block are separated from each other.
The method of manufacturing a mold core for molding a curved surface product according to the present invention may further include a step of removing a mold promoting material for removing a mold promoting material remaining in the metal layer after the step of separating the embossed block.
The release promoting material may be a material containing one of silver (Ag), copper (Cu), a silver alloy, and a copper alloy.
According to the present invention, the shape of the embossed curved surface is transferred to a metal layer made of nickel or a nickel alloy, which is a hard metal, to produce a mold core having an engraved curved surface. Therefore, when the embossed curved surface that is relatively easy to process is surface-processed with high precision and high gloss, the surface characteristics of the embossed curved surface are transferred to the depressed curved surface of the mold core as it is. Thus, the injection molded product using the mold core is highly accurate, As shown in FIG. Further, even in the case of a so-called four-sided curved surface which extends in a convex curve not only in the X-axis direction but also in the Y-axis direction, it can be manufactured to have a high-precision and high- As a result, the production cost of the curved surface product can be reduced, and productivity is improved.
1A and 1B are cross-sectional views showing an example of a smartphone cover having a curved shape, wherein FIG. 1A is a sectional view taken on a ZX plane, and FIG. 1B is a sectional view taken on a YZ plane.
FIGS. 2 to 6 are sectional views sequentially showing the method for manufacturing a mold core for molding a curved product according to the first embodiment of the present invention.
FIG. 7 is a cross-sectional view showing a mold having a mold core shown in FIG. 6 in a mold.
8 and 9 are sectional views sequentially showing the method for manufacturing a mold core for molding a curved surface product according to a second embodiment of the present invention.
Hereinafter, a method of manufacturing a mold core for molding a curved product according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The terminology used herein is a term used to properly express the preferred embodiment of the present invention, which may vary depending on the intention of the user or operator or the custom in the field to which the present invention belongs. Therefore, the definitions of these terms should be based on the contents throughout this specification.
FIGS. 2 to 6 are sectional views sequentially showing the method for manufacturing a mold core for molding a curved product according to the first embodiment of the present invention. Through the method of manufacturing a mold core according to the first embodiment of the present invention, an upper mold core of a mold for injection molding the curved product (CV) shown in Figs. 1A and 1B can be manufactured. The method for manufacturing a mold core for molding a curved surface product according to the first embodiment of the present invention includes steps of forming a relief block, applying a release promoting material, laminating a metal layer, joining a core block, separating a relief block, Respectively.
2, the embossed block forming step includes forming a
3, the step of laminating the metal layer is a step of laminating a
The step of applying the release promoting material is a step of applying the
Referring to FIGS. 4 and 5, the core block bonding step is a step of fixing the
The core block adhesion step is a step of bringing the
6, the relief block separation step separates the
In the step of removing the mold promoting material, the release promoting material 9 (see FIG. 3 (a)) remaining on the side of the
The convex
FIG. 7 is a cross-sectional view showing a mold having a mold core shown in FIG. 6 in a mold. The mold shown in Fig. 7 may be a mold for injection molding the curved product (CV) shown in Figs. 1A and 1B. Referring to FIG. 7, the mold for molding the curved product CV includes an
The
8 and 9 are sectional views sequentially showing the method for manufacturing a mold core for molding a curved surface product according to a second embodiment of the present invention. Through the mold core manufacturing method according to the second embodiment of the present invention, an upper mold core of a mold for injection molding the curved product (CV) shown in Figs. 1A and 1B can be manufactured. As in the first embodiment of the present invention shown in FIGS. 2 to 6, the method for manufacturing a mold core for molding a curved surface product according to the second embodiment of the present invention includes the steps of forming a relief block, applying a release promoting material, A core block bonding step, a relief block separation step, and a release promoting material removal step. Here, the embossed block forming step, the dissociation promoting material applying step, and the metal layer laminating step are the same as those described with reference to FIG. 2 and FIG. 3, and duplicated description will be omitted.
The core block bonding step is a step of fixing the
9, the relief block separation step separates the
In the step of removing the mold promoting material, the release promoting material 9 (see FIG. 8 (a)) remaining on the side surface of the
The convex
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the present invention. Therefore, the true scope of protection of the present invention should be defined only by the appended claims.
2: Embossed block 3: Embossed surface
6: metal layer 10: core block
12: Dent for hook 15: Hook
20: Upper mold core 21: Negative curved surface
Claims (8)
Forming a relief block having an embossed curved surface corresponding to a convex curved surface of the curved product; A metal layer stacking step of stacking a metal layer made of nickel (Ni) or a nickel alloy on the side of the relief surface of the relief block where the relief surface is formed so that the relief surface is covered; A core block bonding step of fixing the core block to the metal layer; And a relief block separating step of separating the relief block from the metal layer and exposing an engraved curved surface recessed to correspond to the relief curve. .
Wherein the forming of the embossed block comprises forming the embossed curved surface in the embossed block through NC (Numerical Control) processing.
Wherein the step of laminating the metal layer comprises plating nickel or a nickel alloy on a side surface of the relief block.
The core block bonding step may include a core block forming step of forming a core block having a groove or a dent for hooks formed on at least one side face thereof, a core block closing step of bringing the core block into close contact with the metal layer, And an additional plating step of further plating the metal layer in the groove or the dent for the hook with the same metal as the metal and forming a connecting hook connected to the metal layer and filled in the hook groove or the dent. Of the mold core.
Wherein the core block bonding step includes a bonding step of bonding the core block to the metal layer with an adhesive made of a synthetic resin.
Further comprising a step of applying a mold promoting material to the side surface of the relief block on which the relief surface is formed, prior to the step of laminating the metal layer,
Wherein the step of separating the embossed block comprises the step of applying an external force in a direction in which the metal layer and the relief block are separated from each other.
Further comprising the step of removing the mold-promoting material for removing the mold-promoting material remaining in the metal layer after the step of separating the embossed block.
Wherein the release promoting material is a material containing one of silver (Ag), copper (Cu), a silver alloy, and a copper alloy.
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KR1020160000720A KR101768157B1 (en) | 2016-01-05 | 2016-01-05 | method for making mold core used in forming product with curved surface |
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KR1020160000720A KR101768157B1 (en) | 2016-01-05 | 2016-01-05 | method for making mold core used in forming product with curved surface |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN112743163A (en) * | 2020-12-23 | 2021-05-04 | 扬昕科技(苏州)有限公司 | Method for manufacturing curved surface mold core |
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JP3751778B2 (en) * | 1999-04-26 | 2006-03-01 | 日本板硝子株式会社 | Method for producing sol-gel molded product |
JP2004042300A (en) | 2002-07-09 | 2004-02-12 | Rooman:Kk | Mold manufacturing method and device |
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Publication number | Priority date | Publication date | Assignee | Title |
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CN112743163A (en) * | 2020-12-23 | 2021-05-04 | 扬昕科技(苏州)有限公司 | Method for manufacturing curved surface mold core |
CN112743163B (en) * | 2020-12-23 | 2022-03-22 | 扬昕科技(苏州)有限公司 | Method for manufacturing curved surface mold core |
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