JP2013071451A - Composite parts formed of metal case having plastic member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide composite parts of metal and plastic materials, such as a case for a mobile phone and a battery back cover, especially, to provide a light metal case molded product having a plastic member molded to a metal case using an insert injection technique.SOLUTION: The composite parts formed of the metal case having the plastic member includes: the metal case having an inner side face and an outer side face; a lamination surface molded on the inner side face of the metal case by a physical method; an adhesive layer provided so as to face the lamination surface; and the plastic member molded on the adhesive layer by injection molding.

Description

  The present invention relates to a composite part of metal and plastic, and more particularly, to a light metal case molding including a plastic member molded into a metal case by an insert injection technique.

  In recent years, portable electronic products have become lighter, thinner, and shorter, so it is necessary to use metal cases that are lightweight and have high steel properties, and composite structure technology consisting of metal cases and plastic members has become the center of gravity for industry development. It has become. Conventionally, after forming metal parts and plastic parts separately, an adhesive is applied to the metal parts, the metal parts and the plastic parts are stacked together, and finally pressed and bonded. However, it is common that the metal case for 3C products is not a simple planar structure but has irregular curved surfaces, and plastic parts also have corresponding curved surfaces, and the bonding process between these curved surfaces is very Since it is difficult, the yield cannot be improved.

  In related prior art, Japanese Patent Application Laid-Open No. 2011-73191 discloses a predetermined surface of CFRP prepreg 12 and metal alloy 11 as shown in FIG. -Carbon fiber reinforced plastic (CFRP) prepreg, characterized in that an epoxy resin adhesive is applied, and then the surfaces to which the adhesive is applied are brought into contact with each other and cured to be bonded. Although a method for strongly bonding a metal alloy is disclosed, when a predetermined surface of the metal alloy 11 is roughened, it is necessary to apply a special chemical solution to form a surface having nanoholes.

  In JP 2010-274600 A, as shown in FIG. 2, a special chemical solution is applied to the surface of the metal alloy component 1 to erode to a surface having nanoholes, and subsequently, metal oxide or metal phosphorus It is necessary to further form a surface layer of oxide, and finally, a plastic part 4 is formed on the surface of the metal alloy part 1 by insert injection molding technology. A manufacturing method is disclosed.

  In Japanese Patent Application Laid-Open No. 2007-179952, a metal coating of an outside keytop piece and a white coating of an inside keytop piece are combined via a fusion layer. A method for manufacturing a key top is disclosed, which is characterized in that the key top is fixed.

  JP-A-2009-81030 discloses an adhesive for adhering a cover member and a key top to form a dot array so that air can be easily degassed in the manufacturing process. The manufacturing method of the pushbutton characterized by forming between the said cover member and the said key top is disclosed.

  The Chinese CN1827839 patent publication is characterized in that a metal part is coated with a bottom lacquer, a metal thin film layer is then coated with a vacuum plating film, and then a transparent dura lacquer protection is applied. A metal surface treatment method for producing a magnesium alloy product having a metal appearance texture by performing a surface treatment on the appearance product of the magnesium alloy is disclosed.

  In Japanese Patent Application Laid-Open No. 2011-11505, as shown in FIG. 3, a resin member is molded on the back surface of the metal component 20, and at the same time, the exterior surface of the metal body 20 is decorated with a decorative sheet F. A method for producing a composite product of metal and resin by injection molding is disclosed.

  Japanese Patent Application Laid-Open No. 2011-11505 discloses a method for manufacturing a composite product in which a molten resin is injected and at the same time a decorative layer is formed on one surface of the metal body, and the composite product of the metal body and the injection resin is molded into a desired shape. Is disclosed.

  In Japanese Unexamined Patent Publication No. 2011-73314, as shown in FIG. 4, in the method of improving the strength of the resin part molded on the outer periphery of the transparent insert material 3, a metal is formed on the outer periphery of the transparent insert material 3. A frame material 4 is provided, and the adhesive sheet 5 is attached to one surface made of the transparent insert material and the metal frame material, and then resin is injection-molded to surround the transparent insert material. In addition, a resin injection molding method using a transparent insert material is disclosed in which the resin component 7 is formed in a state of being engaged with at least a peripheral edge portion of the metal frame material.

JP 2007-179952 A JP 2009-081030 A JP 2010-274600 A JP 2011-011505 A JP 2011-073314 A JP 2011-115955 A JP 2011-073191 A

  The main object of the present invention is to provide an improved composite part with a metal case having a plastic member so as to solve the shortages and disadvantages of the prior art.

  According to a preferred embodiment of the present invention, the present invention includes a metal case having an inner surface and an outer surface, and a bonding surface formed on the inner surface of the metal case by a physical method. Provided is a composite part comprising a metal case having a plastic member, comprising: an adhesive layer provided facing the bonding surface; and a plastic member molded into the adhesive layer by injection molding. However, the physical system includes roughening treatment by abrasive blasting (sand blasting), roughening treatment by laser etching, plasma treatment (plasma), ultraviolet plasma treatment (UV Plasma), or press molding by a mold.

  According to still another preferred embodiment of the present invention, the present invention provides a metal case having an inner surface and an outer surface, and a bonding surface formed on the inner surface of the metal case by a chemical method. And a bonding part provided opposite to the bonding surface, and a plastic member formed on the bonding layer by injection molding. However, the chemical method includes chemical etching and molding.

  The following detailed description of the invention and the accompanying drawings are intended to assist the examiner in understanding the features and technical content of the invention. However, the accompanying drawings are not intended to limit the present invention, but only for reference or assistance in explanation.

  As part of this specification, the accompanying drawings included therein provide a reader with a better understanding of embodiments of the invention. These drawings depict several embodiments of the invention and together with the description of the text explain the principles thereof. These drawings are as follows.

FIG. 3 is a schematic diagram of strong adhesion between a carbon fiber reinforced plastic prepreg and a metal alloy according to Japanese Patent Application Laid-Open No. 2011-73191. It is a schematic diagram of the composite of the metal alloy and thermosetting resin by Unexamined-Japanese-Patent No. 2010-274600. It is a schematic diagram of producing a composite product of metal and resin by injection molding according to Japanese Patent Application Laid-Open No. 2011-11505. It is a schematic diagram of the resin injection molding method by the transparent insert material by Unexamined-Japanese-Patent No. 2011-73314. It is a side view which illustrates the composite component by the metal case which has a plastic member of this invention. It is a cross-sectional schematic diagram of the composite component by the metal case which has the plastic member shown in FIG. 5 along cut line II '. FIG. 7 is an enlarged schematic diagram of a circled portion shown in FIG. 6. It is a schematic diagram which shows the manufacture flow of the composite component by the metal case which has a plastic member by one preferable Example of this invention. FIG. 6 is a schematic diagram illustrating a manufacturing flow of a composite part using a metal case having a plastic member according to still another preferred embodiment of the present invention.

  It should be noted that any of the drawings herein are for illustrative purposes. In order to make the drawings clear and easy to explain, each part in the drawings may be shown to be enlarged or reduced in proportion to the size. In general, the same reference numbers in the drawings are used to indicate corresponding or similar features after modification or in different embodiments.

  In the detailed description that follows, reference numerals are set forth as part of the accompanying drawings and are specifically described so that the embodiments may be implemented. Such embodiments are described in sufficient detail to enable those skilled in the art to practice. The reader may adopt other embodiments in the present invention or make any structural, logical, or step-by-step changes without departing from the embodiments described herein. Should be understood. The following detailed description is, therefore, not to be taken as a limitation, whereas the examples contained therein are limited by the scope of the appended claims.

  FIG. 5 is a side view of a composite part made of a metal case having a plastic member of the present invention, and FIG. 5 is a schematic cross-sectional view of the composite part made of a metal case having a plastic member shown in FIG. Reference is made to FIG. 6 and FIG. 6A, which is an enlarged schematic view of the circled portion shown in FIG. The composite part by the metal case which has the plastic member of this invention may be a mobile telephone housing | casing or a battery back cover. As shown in FIGS. 5 and 6, the composite part 1 made of a metal case having a plastic member of the present invention is formed on the metal case 10 and the inner surface S1 of the metal case 10, and includes a signal port 12 a, an assembly structure 12 b, Or a plastic member 12 including a reinforcing structure 12c.

The plastic member 12, injection molded into the lamination surface S _B of the inner surface S1 of the metal case 10, more specifically, the lamination surface S _B, prior to injection, molding by previously physical method or chemical method, lamination the adhesive layer 112 on the mating surface _{S B} is provided, the plastic member 12, by injection molding to the adhesive layer 112, tightly joined to the metal casing 10. Further, the outer surface S0 of the metal case 10 may be covered with the surface decoration layer 101 so that expressions with different appearance textures can be obtained.

Physical methods for forming the lamination surface _{S B} is the surface roughening treatment by abrasive blasting (sandblasting), roughening treatment by laser etching, plasma treatment (plasma), ultraviolet plasma treatment (UV Plasma) or The pressing method using a mold may be included, and the chemical method may include a chemical etching process and forming.

  Please refer to FIG. 7, which is a schematic diagram showing a manufacturing flow of a composite part using a metal case having a plastic member according to a preferred embodiment of the present invention. As shown in FIG. 7, the method for manufacturing a composite part using a metal case having a plastic member according to the present invention includes S100, which is a metal case manufacturing step, mainly insert injection molding, surface treatment step, and subsequent product quality control inspection. It has two subflows called S102. First, the metal material supply (step M01) and the inspection of the supply material are performed. However, the metal material may be stainless steel, magnesium alloy, aluminum alloy, magnesium aluminum alloy, or the like. Then, for example, press molding (step M02) is performed on the metal material so as to obtain a desired metal case shape such as a mobile phone casing or a battery back cover, and then cutting (step M03). Then, a trimming process step (step M04) is performed.

  After completing the trimming process step, the bonding surface is formed on the inner surface of the metal case (step M05). According to a preferred embodiment of the present invention, the bonding surface may be surface-treated by a physical method such as a roughening treatment by abrasive grain spraying. Of course, the surface may be roughened by selecting other physical methods such as a roughening process by laser etching, a plasma process, an ultraviolet plasma process, or press molding by a mold. Further, for example, a chemical method such as chemical etching or molding may be selected to mold the bonding surface. Then, a cleaning step (Step M06) is performed. Thereafter, for example, an adhesive or a primer is applied to the bonded surface that has been surface-treated or processed by a method such as spraying, gluing, or printing, and an adhesive layer is applied to the bonded surface. The adhesive coating step (Step M07) is performed so as to form Next, baking (step M08) is performed, thereby completing the sub-flow S100. The metal case processed in the subflow S100 waits for a subsequent insert injection molding process, that is, the subflow S102.

  Hereinafter, the subflow S102 will be described in detail. First, a resin raw material supply (step P01) and an inspection are performed. However, the resin raw material includes polycarbonate (PC) resin, acrylonitrile-butadiene-styrene copolymer (ABS) resin, or polyphenylene sulfide (polyphenylene). Sulphide (PPS) resin or the like may be used. Then, a drying process (step P02) is performed. Thereafter, an insert injection process (step P03) is performed so that the resin raw material or plastic is injection-molded into the metal case processed in the subflow S100. More specifically, the plastic is directly injection-molded on the adhesive layer on the bonding surface of the metal case. As an example, the metal case may be a mobile phone housing or a battery back cover, etc., and the plastic member to be injection molded may be a signal port, an assembly structure and / or a reinforcing structure. The insert injection molding process is a well-known technique and will not be described in detail. After that, a trimming process step (Step P04) is performed. Thereafter, for example, surface decoration treatment (step P05) of the metal part such as abrasive grain spraying, hairline treatment, PVD treatment, anodizing treatment or spraying treatment may be selected. However, it should be noted that the PVD treatment further includes a nickel plating film treatment that can exhibit a special effect of hidden characters on the surface of the case. Moreover, you may provide a decoration layer in the outer surface of a metal case so that various colors, a pattern, and a pattern may be formed by systems, such as printing, coating, and aluminum anodizing, for example. Finally, shaping (step P06) and subsequent quality control step (step P07) are performed to complete the subflow S102.

  Referring to FIG. 8, which is a schematic diagram showing a manufacturing flow of a composite part using a metal case having a plastic member according to another preferred embodiment of the present invention. As shown in FIG. 8, another preferred embodiment of the present invention, which is a method for manufacturing a composite part using a metal case having a plastic member, is similarly S200, which is a metal case manufacturing step, and main steps. Are provided with two sub-flows of S202 which is insert injection molding and subsequent product quality control inspection. Hereinafter, the subflow S202 will be described in detail. First, the metal material supply (step M11) and the supply material are inspected. However, the metal material may be stainless steel, magnesium alloy, aluminum alloy, magnesium aluminum alloy, or the like. A bonding surface is formed on the inner surface of the metal case (step M12). According to a preferred embodiment of the present invention, the bonding surface is surface-treated by a physical method such as a roughening treatment by abrasive grain spraying. Of course, the surface may be roughened by selecting other physical methods such as a roughening process by laser etching, a plasma process, an ultraviolet plasma process, or press molding by a mold. Further, for example, a chemical method such as chemical etching or molding may be selected to mold the bonding surface. Then, for example, press molding (step M13) is performed on the metal material so as to obtain a necessary metal case shape such as a mobile phone casing or a battery back cover, and then cutting (step M14). Then, a trimming process step (step M15) is performed. Then, a cleaning step (Step M16) is performed.

  After completing the cleaning step, surface decoration processing (step M17) such as abrasive grain spraying, hairline processing, PVD processing, anodizing or spraying is performed next. However, it should be noted that the PVD treatment further includes a nickel plating film treatment that can exhibit a special effect of hidden characters on the surface of the case. Moreover, you may provide a decoration layer in the outer surface of a metal case so that various colors, a pattern, and a pattern may be formed by systems, such as printing, coating, and aluminum anodizing, for example. Thereafter, for example, an adhesive or a primer is applied to the bonded surface that has been surface-treated or processed by a method such as spraying, gluing, or printing, and an adhesive layer is applied to the bonded surface. The adhesive coating step (step M18) is performed so as to form Next, baking (step M19) is performed, and thereby the subflow S200 is completed. The metal case processed in the subflow S200 waits for a later insert injection molding process, that is, the subflow S202.

  Hereinafter, the subflow S202 will be described in detail. First, resin raw material supply (step P11) and inspection are performed. However, the resin raw material may be PC resin, ABS resin, PPS resin, or the like. And a drying process (step P12) is performed. Thereafter, an insert injection process (step P13) is performed so that the resin raw material or the plastic is injection-molded into the metal case processed in the subflow S200. More specifically, the plastic is directly injection-molded on the adhesive layer on the bonding surface of the metal case. As an example, the metal case may be a mobile phone housing or a battery back cover, etc., and the plastic member to be injection molded may be a signal port, an assembly structure and / or a reinforcing structure. The insert injection molding process is a well-known technique and will not be described in detail. Later, a trimming process step is performed (step P14). Finally, shaping (step P15) and subsequent quality control step (step P16) are performed to complete subflow S202.

  All of the above are only preferred embodiments of the present invention, and all equivalent changes and modifications according to the claims of the present invention belong to the scope included in the present invention.

Composite component according to a metal case having 1 plastic member, 10 metal case, 12 plastic member, 12a signal port, 12b assembled structure, 12c reinforcing structure 101 decorative layer, 112 an adhesive layer, S0 inner surface, S1 outer surface, _{S B} Bonding surface, S100, S102, S200, S202 Subflow, M01, M11 Metal material supply, M02, M13 Press molding, M03, M14 Cutting, M04, M15, P04, P14 Trimming treatment, M05, M12 Bonding surface treatment , M06, M16 cleaning, M07, M18 adhesive coating, M08, M19 baking, M17, P05 surface decoration treatment, P01, P11 resin raw material supply, P02, P12 drying, P03, P13 insert injection, P06, P15 shaping, P07, P16 latter quality control step

Claims (9)

A metal case having an inner surface and an outer surface;
A bonding surface formed on the inner surface of the metal case by a physical method or a chemical method;
An adhesive layer provided facing the bonding surface;
A composite part comprising a metal case having a plastic member, comprising: a plastic member formed on the adhesive layer by injection molding.   The composite part by the metal case which has a plastic member of Claim 1 in which the said contact bonding layer contains an adhesive agent.   The said metal case is a composite part by the metal case which has a plastic member of Claim 1 or 2 containing a magnesium alloy, an aluminum alloy, or a magnesium aluminum alloy.   The said metal case is a composite component by the metal case which has a plastic member of Claim 1 or 2 containing stainless steel.   5. The plastic member according to claim 1, wherein the plastic member includes a polycarbonate resin, an acrylonitrile-butadiene-styrene copolymer (ABS) resin, or a polyphenylene sulfide (PPS) resin. A composite part comprising a metal case having the plastic member according to the item.   6. The composite part using a metal case having a plastic member according to claim 1, wherein the plastic member is a signal port.   The composite part by the metal case which has a plastic member of any one of Claim 1 to 6 in which the said plastic member is an assembly structure.   The composite part using a metal case having a plastic member according to any one of claims 1 to 7, wherein the plastic member is a reinforcing structure.   The composite part by the metal case which has a plastic member of any one of Claim 1 to 8 further provided with the decoration layer provided in the said outer surface of the said metal case.

Images