WO2012062004A1

WO2012062004A1 - Molding method of metal-plastic production with window

Info

Publication number: WO2012062004A1
Application number: PCT/CN2010/079130
Authority: WO
Inventors: 苏俊守
Original assignee: 深圳庆和胶粘制品有限公司
Priority date: 2010-11-09
Filing date: 2010-11-25
Publication date: 2012-05-18
Also published as: CN102049838A

Abstract

A molding method of a metal-plastic production with a window comprises steps: obtaining a metal shell (1) with a window (11); opening a plurality of grooves (12) on the inner surface of the metal shell (1); pre-heating the metal shell (1) and filling hot melt adhesive (2) in the grooves (12); disposing the metal shell (1) with hot melt adhesive (2) in a master mold and heating; injecting plastic (3) into the master mold and the inner surface and the window (11) of the metal shell (1), to mold the plastic (3) and the metal shell (1) in one body. It is possible to reduce the volume of the production and decrease the weight and cost of the production.

Description

Metal part and plastic molded product forming method with window and application thereof

Technical field

The invention relates to a molding product forming method and an application thereof, in particular to a metal member and a plastic molding product forming method with a viewing window and an application thereof.

Background technique

With the development of science and technology, portable electronic products must meet the requirements of strength and other quality while meeting the requirements of communication and appearance. Portable electronic products are affected by their light weight and thin thickness, and are prone to cracking or breaking after accidental fall. In order to solve the strength problem, researchers generally use materials with high strength and moderate flexibility. If the material itself is not structurally strong, metal parts are usually added by in-mold molding (insert Molding or assembly (Assemb1y) metal to ensure the strength of electronic products.

For the embedding of large-area metal, it is often necessary to punch holes in the metal sheet or increase the buckle position, etc., the processing is complicated, the yield is not high, and the cost is high. At the same time, due to the low bonding strength of plastic and metal, metal processing is complicated, which often leads researchers to limit the design and material selection.

At present, there is a molding method which is a metal in-mold bond injection molding (MAM) technology, which directly integrates metal and plastic in a mold. The technology has low requirements for metal sheets, and it is not necessary to buckle the design to achieve plasticity. Combined with high strength, it simplifies metal processing, improves yield and reduces costs. However, in the case where the metal product is not buckled, the bonding force between the plastic surface and the metal surface is relatively poor. Even if the metal surface is treated, the combined effect is still not ideal in the drop and tension side tests. If the metal parts are placed in the mold, some parts of the metal parts are embedded in the plastic parts, which can also increase the bonding strength between the metal parts and the plastic parts, but the structure of the metal parts tends to be complicated, and the product is added. The difficulty in structural design is not conducive to large-scale production, and is not conducive to cost savings.

At present, the outer casing of the portable electronic product with the electronic display screen is prepared by adhesively bonding a layer of transparent plastic at the window on the metal casing, and the thickness of the outer casing with the viewing window is thick, thereby causing the portable The size and weight of electronic products are not enough to meet the concept of lightweight electronics, and the bonded plastics are easily separated from metal parts, resulting in low overall quality of portable electronic products.

technical problem

The embodiment of the invention provides a metal member and a plastic molded product forming method with a high-intensity bonding window and an application thereof, so as to solve the problems of low bonding strength, large volume and weight in the existing molding method.

Technical solution

The technical solution adopted to solve the technical problem of the present invention is to provide a molding method of a metal member and a plastic molded article having a viewing window, the molding method comprising the following steps:

Obtaining a metal piece, the metal piece being provided with a window;

Opening a plurality of grooves on an inner surface of the metal member;

Preheating the metal member and filling the groove with hot melt adhesive;

Place the metal piece with the hot melt adhesive in the master mold of the mold, heat the mold, and eject the plastic into the inner mold of the mold and at the inner surface of the metal member and the window of the metal member. The master mold is filled, and the plastic and the metal member are integrally formed to form a metal member and a plastic molded product having a viewing window, and the plastic is transparent or translucent.

The invention also provides a method for molding a molded article having a metal member and a plastic in the preparation of a metal member having a viewing window and a plastic molded article or an electronic device casing.

Beneficial effect

Compared with the prior art, the above technical solution has at least the following advantages:

1. A plurality of grooves are formed on the inner surface of the metal member so that the hot melt adhesive is fixed in position and firmly bonded during injection molding;

2. Through in-mold filling and injection, the processing flow can be reduced, the hot melt adhesive can be avoided, and the yield of the molded product can be improved and the appearance quality of the molded product can be improved;

3. The plastic is injected on the inner surface of the metal member and the window of the metal member, and the female mold is filled, so that the window metal member and the plastic are integrally formed, thereby effectively reducing the volume of the molded product, reducing the weight of the molded product, and reducing the molding. The product preparation process reduces production costs.

DRAWINGS

The present invention will be further described below in conjunction with the accompanying drawings and embodiments, in which:

Figure 1 is a front elevational view showing the first structure of the metal member in the present invention;

Figure 2 is a front elevational view of the first structure of the metal member of Figure 1 and a molded article of plastic;

Figure 3 is a partial cross-sectional view showing the first structure of the metal member and the molded article of the plastic after molding in the present invention;

Figure 4 is a partial cross-sectional view showing the second structure of the metal member and the molded article of the plastic after molding in the present invention;

Figure 5 is a partial cross-sectional view showing a third structure of the metal member in the present invention;

Figure 6 is a partial cross-sectional view showing a fourth structure of the metal member in the present invention;

Fig. 7 is a flow chart showing a molding method of a metal member and a plastic molded article having a viewing window in the present invention.

Embodiments of the invention

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The embodiment of the invention provides a metal member and a plastic molded article having a viewing window, and a molding method thereof, which is used for molding a metal member provided with a window and a plastic to form a molded article having a viewing window. The molded article structure is as shown in FIG. 1 to FIG. 3, and the molded article includes a metal member 1 including a window 11 and an inner surface, and the inner surface is provided with at least one groove 12, and the molded article further includes A plastic 3 in which the inner surface of the metal member 1 is combined with the window 11 of the metal member 1, and a continuous or discontinuous layered adhesive layer 2 bonded between the metal member 1 and the plastic member 3. Thus, the transparent or translucent plastic 3 and the window 11 incorporated at the window 11 of the metal member 1 constitute the viewing window 11' of the molded article, and the plastic 3 bonded to the window 11 of the metal member 1 is bonded to the metal member. The plastic 3 on the inner surface is a whole. The metal member and the plastic molded product having the viewing window effectively reduce the volume of the molded product, reduce the weight of the molded product, reduce the preparation process of the molded article, reduce the production cost, and improve the impact strength and quality of the molded product. .

Specifically, the size of the opening of the inner surface of the metal member 1 where the groove 12 is formed is preferably smaller than the size of the inner portion of the groove 12. The function of the groove 12 is to ensure that the hot melt adhesive can be fixed at the relevant position during the preparation of the metal member and the plastic molded product having the viewing window, so that the fusion effect is good and the glue is prevented from overflowing. The situation happened. The purpose of arranging the opening of the groove 12 to be smaller than the size of the inside of the groove 12 is to increase the bonding force of the hot melt adhesive and the metal member, and is not easily moved in the subsequent injection molding. Position, wash away.

Please refer to FIG. 4, which is a partial cross-sectional view showing the second structure of the metal member and the plastic molded article after molding in the embodiment of the present invention. The metal member 20 includes a window (not shown in FIG. 4) and a concave portion 22 which is uniformly distributed and arranged in the same direction on the inner surface of the cross-sectional portion of the non-window portion. In the embodiment of the present invention, at least three randomly distributed grooves 22 may be formed in the inner surface of the metal member according to the needs of the bonding effect.

Further, as shown in FIGS. 5 and 6, FIG. 5 is a partial cross-sectional view showing a third structure of the metal member in the present invention, the metal member 30 including two windows (not shown in FIG. 5) and a non-window. A crown-shaped recess 32 is defined in the inner side of the cross-sectional portion of the portion, and at least two side-by-side recesses 32 may be formed. Figure 6 is a partial cross-sectional view showing a fourth structure of the metal member in the present invention, the four members of the metal member 40 (not shown in Figure 6) and the inside of the cross-sectional portion thereof are provided with a boat-shaped recess 42 or At least two side-by-side grooves 42 are provided. It can be understood that, in the present invention, the number and shape of the windows of the metal members can be designed according to actual needs, and the shapes of the grooves can be various, regular shapes, and irregular shapes.

Specifically, the plastic 3 is a transparent or translucent plastic, preferably a transparent plastic 3. As shown in Fig. 2, the transparent plastic 3 can effectively increase the transparency of the viewing window 11'. Plastic 3 can be used to make electronic product casings, for example, polycarbonate (PC) having a molecular weight of 20,000 to 60,000, polymethyl methacrylate (PMMA) having a molecular weight of 20,000 to 200,000, ABS and/or polyvinyl chloride ( PVC) and so on. The thickness of the plastic 3 at the viewing window is preferably 0.3 to 1.2 mm. The material of the metal member 1 is not particularly limited, and is preferably a metal having a relatively high strength and strength, such as iron, aluminum, aluminum alloy, copper, magnesium, magnesium alloy, stainless steel, or the like. The structure of the metal member 1 and the position and shape of the window 11 of the metal member 1 are designed by the designer according to the structure of the product. The bonding layer 2 is used for bonding the metal member 1 and the plastic 3. The thickness of the bonding layer 2 depends on the size of the product and the actual needs, and is preferably in the range of 0.1 to 0.2 mm. According to an embodiment of the present invention, the bonding layer 2 is preferably a hot melt adhesive, which is a solvent-free, moisture-free 100% solid fusible polymer which is solid at room temperature and heated. Melting to a certain temperature becomes a liquid that can flow and has a certain viscosity. The embodiment of the present invention is not particularly limited to the composition of the hot melt adhesive, and the hot melt adhesive needs to have a certain heat resistance in order to avoid the overfilling of the hot melt adhesive in the subsequent injection molding process. The hot melt adhesive has a heat resistance of more than 220 °C.

The flow of the method for preparing the metal member and the plastic molded article having the viewing window in the embodiment of the present invention is as shown in FIG. 7 , and referring to FIGS. 1 to 3 , the molding method includes the following steps:

S1. Obtaining a metal piece 1, the metal piece is provided with a window 11;

S2. A plurality of grooves 12 are defined in the inner surface of the metal member 1;

S3. preheating the metal member 1, and filling the groove 12 with hot melt adhesive;

S4. The metal member 1 with the hot melt adhesive is placed in a master mold of the mold, and the mold is heated into the mold of the mold and on the inner surface of the metal member 1 and the window 11 of the metal member 1. The plastic 3 is injected and the master mold is filled, so that the plastic 3 and the metal member 1 are integrally formed to form a metal member and a plastic molded article having a viewing window, and the plastic is transparent or translucent.

Specifically, in the step S1 of the above-described molding method, the structure of the metal member 1 and the position and shape of the window 11 of the metal member 1 are designed by the designer according to the structure of the product. The material of the metal member 1 is as described above, and in order to save space, it will not be described herein.

In the step S2 of the above-mentioned forming method, a plurality of grooves 12 are formed on the inner surface of the metal member 1 by etching or laser engraving. The shape and number of the grooves 12 are as described above, and are not described herein again in order to save space.

In step S3 of the above molding method, the metal member 1 may be preheated to a certain temperature, preferably 100-150 ° C, more preferably, the heating temperature is 110 ° C, and then the hot melt adhesive is pressed onto the metal member 1 by using a jig. At least the hot melt adhesive in the groove 12 of the metal member 1 is melted and firmly bonded. The above pressing time is 3-7 seconds, preferably 6 seconds.

In the step S4 of the above molding method, at the time of filling molding, the mold master side is heated by the water temperature or the oil temperature through the mold, the mold side mold temperature is greater than 60 ° C, and the plastic 3 is filled with a certain temperature of the plastic 3 and Hot melt adhesives have good bonding. After the filling of the plastic 3 is completed, the hot melt adhesive forms the adhesive layer 2, and the adhesive layer 2 firmly bonds the plastic 3 and the metal member 1 into one body, thereby forming a metal member and a plastic molded product having a viewing window. The plastic 3 and the window 11 combined at the window 11 of the metal member 1 constitute the viewing window 11' of the molded article, and the plastic 3 bonded to the window 11 of the metal member 1 and the plastic 3 bonded to the inner surface of the metal member 1 For a whole.

The above-mentioned metal member with a viewing window and the molding method of the plastic molded article have at least the following advantages: 1. A plurality of grooves are formed in the inner side of the metal member so that the hot melt adhesive is fixed in position and firmly bonded during injection molding; Through the in-mold filling and injection, the processing flow can be reduced, the hot melt adhesive can be avoided, and the yield of the molded product can be improved and the appearance quality of the molded product can be improved. 3. The molding method is simple, suitable for industrial production, and reduced. Cost of production.

It is precisely because of the above-described advantages of the molding method of the molded article having the metal member and the plastic which can be used in the preparation of the metal member and the plastic molded article having the viewing window. The structure of the metal member and the plastic molded product having the viewing window prepared by the molding method of the metal member and the plastic molded article and the advantages thereof are as described above, and will not be described herein for the sake of simplicity. The prepared molded article having a metal member and a plastic can be used for an electronic device casing, particularly an electronic device casing having an electronic display.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. Within the scope.

Claims

A method for molding a metal member and a plastic molded article having a viewing window, characterized in that the molding method comprises the following steps:

Obtaining a metal piece, the metal piece being provided with a window;

Opening a plurality of grooves on an inner surface of the metal member;

Preheating the metal member and filling the groove with hot melt adhesive;

Place the metal piece with the hot melt adhesive in the master mold of the mold, heat the mold, and eject the plastic into the inner mold of the mold and at the inner surface of the metal member and the window of the metal member. The master mold is filled, and the plastic and the metal parts are integrally formed to form a metal piece and a plastic molded product having a viewing window.
The molding method according to claim 1, wherein the inner surface groove of the metal member is opened by etching or laser engraving.
The molding method according to claim 1 or 2, wherein the size of the groove opening is smaller than the size of the inside of the groove.
The molding method according to claim 1, wherein the preheating metal member has a preheating temperature of from 100 ° C to 150 ° C.
The molding method according to claim 1, wherein the mold heating is performed by heating the water temperature or the oil temperature to equalize the mother mold to be equal to Or greater than 60 ° C.
The molding method according to claim 1, wherein the metal member is one of iron, aluminum, aluminum alloy, copper, magnesium, magnesium alloy, and stainless steel.
The molding method according to claim 1, wherein the plastic is at least one of polycarbonate, polymethyl methacrylate, and polyvinyl chloride.
The use of the molding method according to any one of claims 1 to 7 for producing a metal member having a viewing window and a plastic molded article.
The application according to claim 8, wherein the metal member and the plastic molded article have a plastic thickness of 0.3 to 1.2 mm.