JPH0639876A - Method for in-mold molding and thin-wall box using it - Google Patents

Abstract

PURPOSE:To attempt to improve productivity by increasing adhesive strength especially between a metal part and a resin in relation with a constitution of a method for in-mold molding and a thin-wall box. CONSTITUTION:In a method for in-mold molding wherein a metal and a resin are integrally injection-molded, an adhesive 22 is applied with an approximately uniform thickness at least on a bonding face of a metal part 21 with the resin for in-mold molding and then, the metal part 21 is set by positioning at a specified position in a mold 26 and thereafter, a heat-melted resin 23 is fed under pressure in a required region of the metal part 21 to mold integrally it with the metal part 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-mold molding method for integrating a metal part and a resin and a structure of a thin-walled case, and particularly to improve productivity by increasing the adhesive strength between the metal part and the resin. The present invention relates to an in-mold molding method and a thin casing using the same.

In recent years, there has been a strong demand for downsizing and cost reduction as a device in the field of electronic equipment, but especially in the field of handy terminals such as portable communication equipment and POS terminals, how light and inexpensive the casing is. In addition, it has become a major issue how to form a tough one, and as a technique corresponding to it, an in-mold forming method of integrating a metal part and a resin to form a formed body has been put into practical use.

This method of injection-molding a resin in a state where the metal part or the metal plate is set in the mold to integrate the two is a method of insert molding in which the metal part is embedded in the resin and the resin part on the metal substrate. Although it is distinguished from outsert molding, the metal parts to be fixed are loosened due to the difference in thermal expansion coefficient between the metal and resin and the molding shrinkage when the resin hardens, or the metal and the resin are molded. There is a disadvantage that it is easy to peel off the gap.

[0004]

2. Description of the Related Art Therefore, in order to suppress the above-mentioned disadvantages, for example, methods such as imparting an anchor effect and coating a coupling agent have been put into practical use.

That is, in the former case, an unevenness such as an anchor hole or a cut-and-raised piece is provided in a required area of the surface of the metal part, and when the resin is injection-molded, the metal part and the resin are meshed with each other in the uneven area to improve the joining effect between the two. In the latter, the amphiphilic organic compound having a polar group at one end and a non-polar group at the other end is applied to the surface of the metal component to improve the adhesiveness with the resin.

FIG. 8 exemplifying the above case as a part of a thin plate housing (hereinafter referred to as a panel) is a view showing a conventional in-mold molding method together with a structural example, and (8-1) is a perspective view of a main part. FIG. 8 (2) is a sectional view taken along the line aa 'in (8-1).

In (8-1) of the figure, the panel 1 has mounting holes 11a and anchor holes at a plurality of predetermined positions (four positions in the figure).
Al having a thickness of about 0.5 mm and 11b and
With the (aluminum) plate 11 set in a mold (not shown), a polycarbonate resin layer 12 was formed on one surface (lower surface in the figure) of the Al plate 11 except for the mounting holes 11a by a normal injection molding technique. It is a thing.

In the panel 1, since the polycarbonate resin layer 12 penetrates into the inside of the anchor hole 11b as shown in (8-2), for example, in the sample 1'cut out by 20 × 20 mm including one anchor hole 11b. The adhesive strength between the two is 0.5 Kgf / cm ² (Kgf) for almost "0" when the anchor hole is not present.
Can be increased to Kg weight, and so on).

[0009]

However, in the conventional in-mold molding method, when the unevenness such as the anchor hole is provided as described above, the joining effect is remarkable, but the shape and the arrangement of the unevenness formed on the metal side. Since it takes time to design and manufacture the mold because it requires structural examination of the position, etc., and in regions other than the above-mentioned concave and convex arrangement position, the adhesive force between the metal part and the injection-molded resin is weak, so floating easily occurs, resulting in Moreover, there is a problem that not only the appearance is impaired, but also dew condensation may occur, or sudden shock or vibration may cause the metal parts to loosen and fall off or peel off to cause cracks.

Further, in the latter case described above, there is a problem that the effect of coating the coupling agent does not contribute so much to the improvement of the adhesive strength.

[0011]

The above problem is an in-mold molding method in which a metal and a resin are integrated and injection-molded, and an adhesive is applied to at least the joint surface of the metal part to be in-molded with the resin. Is applied to a substantially uniform thickness, the metal part is positioned and set in a predetermined position in the mold, and then, the heated and melted resin is injected under pressure into a required area of the metal part. This is solved by an in-mold forming method in which the metal part is integrally formed.

In addition, the method is an in-mold molding method in which a metal and a resin are integrally molded, and at least a bonding surface of a metal part to be subjected to the in-mold molding with a resin is treated with a triazine thiol-based surface treatment agent for surface treatment. After forming the layer, the metal part is positioned and set in a predetermined position in the mold, and then the molten resin is pressurized and injected into the required area of the metal part to be integrated with the metal part. This is solved by an in-mold molding method that allows molding.

Further, there is provided a thin-walled housing in which a metal plate and a resin covering at least one surface thereof are integrally molded by injection molding of the resin, and the semi-cured film is adhered and formed on the bonding surface of the metal plate with the resin. The resin integrally molded with the metal plate via a thermosetting adhesive in a dry state or a heat resistant rubber adhesive in a dry state is a general-purpose resin or a single-molding with a thermoplastic elastomer, or the general-purpose resin and a thermoplastic elastomer. The problem is solved by a thin-walled housing configured by composite molding by sequential molding of.

Further, a thin-walled housing in which a metal plate and a resin covering at least one surface thereof, a resin member fixed to the metal plate, or both are integrally molded by injection molding of the resin, The resin is solved by a thin-walled casing formed by adhering the resin with a surface treatment layer of the metal plate 41 with a triazine thiol surface treatment agent.

[0015]

When the required area of the surface of the metal part is coated with a specific adhesive, or after the surface of the metal part is treated with the specified surface treatment agent, the surface of the metal part is resin-molded by an ordinary injection molding technique. Since the surface of the metal part and the injection-molded resin can be directly adhered to each other, it is possible to prevent the metal part from dropping or cracking described above without providing irregularities such as the anchor holes and the cut and raised pieces.

Therefore, in the present invention, an epoxy type or acrylic type thermosetting adhesive or a nitrile rubber type or chloroprene rubber type heat resistant rubber adhesive having excellent adhesiveness to a metal is applied to a required area on the surface of a metal part. After curing, the former is injection-molded in a semi-cured state and the latter is dried.

Further, in the present invention, the surface of the metal part is treated with a triazine thiol-based surface treating agent, and then the resin is injection-molded. Therefore, it is possible to improve the adhesiveness between the metal part and the molding resin as compared with the conventional case in which the unevenness is provided, without providing unevenness such as anchors and cut-and-raised pieces in the conventional in-mold molding method. Can be expected to improve.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The in-mold molding method according to the present invention will be sequentially described below. FIGS. 1 to 5 explain a molded body in the case of interposing an adhesive together with the molding method, and FIGS.
Describes a molded product in the case of treating the surface of a metal component with a surface treatment agent together with the molding method.

That is, FIG. 1 is a diagram for explaining an in-mold molded body using a thermosetting adhesive, including its molding method, FIG. 2 is a diagram for explaining another embodiment of FIG. 1, and FIG. 3 is a diagram. 1
Of the in-mold molded body in which the injection molding resin is replaced with a thermoplastic elastomer, including its molding method, FIG. 4 is a process chart showing the in-mold molding method using a heat-resistant rubber adhesive, and FIG. 4 is a diagram for explaining a process by applying 4 to a housing, FIG. 6 is a diagram for explaining an in-mold forming method using a metal surface treatment agent, and FIG. 7 is a diagram for explaining another embodiment of FIG. .

Regarding the in-mold molding method using an adhesive, the inventors of the present invention have found that a metal part coated with a commercially available thermosetting adhesive such as an epoxy type, an acrylic type or a polyurethane type which has excellent adhesiveness to a metal. (Al plate in the case of the figure)
It was considered that when the resin was injected under pressure in a state where it was set in the mold for injection molding and was molded, the applied adhesive was cured by the heat of the injected resin and exhibited an adhesive effect.

However, as a result of experiments, it has been found that when the resin is molded while the adhesive is applied, the adhesive is washed away by the injected resin, so that the adhesive effect is not exerted. Therefore, in the present invention, the adhesive applied to the metal parts is divided into a thermosetting type and a heat resistant rubber type. In the former case, the resin is injected in a semi-cured state, and in the latter case, the resin is injected in a dried state. By taking the above means, resin molding is performed to improve the adhesive force between the injected resin and the metal parts.

As a result of experiments, the inventors have found that it is more effective to make the coating thickness of the adhesive as uniform as possible. Roughening the surface of metal parts will further enhance the effect. I understood.

Therefore, in the present invention, the adhesive is applied to the surface of the metal component in a thickness as uniform as possible, and the in-mold molding is performed in a semi-cured state or in a dried state. The conversion process and the anchor effect are applied.

FIG. 10 shows an example of in-molding a panel similar to that shown in FIG. 1 in which an epoxy adhesive is used as the thermosetting adhesive. In FIG. 1, the Al plate 21 constituting the panel is (1-1). As shown, it has a size of, for example, about 60 × 60 × 0.5 mm, and mounting holes 21a are formed at its four corners.

Therefore, after degreasing and washing the Al plate 21 with acetone and ethanol, as shown in (1-2), the thermosetting property such as "Cemedine EP-106" Cemedine Co., Ltd. "" Approximately 20 times the adhesive 22 by manual means such as brush painting.
Apply to a thickness of about μm and dry at 120 ° C for about 15 minutes to obtain a semi-cured state.

Next, the Al is placed inside the mold 26 shown in (1-3).
The plate 21 is positioned and mounted, for example, by injecting the polycarbonate resin 23 'under pressure at a temperature of 300 ° C, an injection set pressure of 100 kg / cm ² , and an injection time of 1 second, as shown in (1-4). The panel 2 including the Al plate 21 and the polycarbonate resin layer 23 can be obtained.

In this case, the adhesive strength between the Al plate 21 and the polycarbonate resin layer 23 in the sample 2'cut to a size of 20 × 20 mm similar to that in FIG. 10 is 1.9 Kgf / cm ² , which improves the adhesive strength in FIG. If an anchor hole for
It was confirmed that an adhesive force larger than 0.5 Kgf / cm ² was obtained.

In order to further enhance the effect of the adhesive, FIG. 2 shows the use of the Al plate of FIG. 8 having an anchor hole and the uniform application thickness of the adhesive. That is, the panel 3 in FIG. 2 is the same as in FIG.
The plate 11 is dipped in a solution of the above-mentioned thermosetting adhesive 22 dissolved in alcohol, and then the excess solution is removed by, for example, a roller or the like to make the thickness of the adhesive 22 uniform, and as in FIG. After the semi-cured state, the polycarbonate resin is injected under the same conditions as in FIG. 1 to form the Al plate 11 and the polycarbonate resin layer 31.
The panel 3 is composed of

In this case, Al in sample 3'similar to FIG.
The adhesive strength between the plate 11 and the polycarbonate resin layer 31 is 2.1 kg.
It was f / cm ² , which was higher than in the case of FIG.
If a panel is constructed in the same process as in Fig. 2 using an Al plate whose surface is roughened with sandpaper of mesh # 100, the adhesive strength between the Al plate and the polycarbonate resin layer in the sample similar to Fig. 2 is 4.3 Kgf / I was able to raise it to cm ² .

Furthermore, the in-mold molding method shown in FIGS. 1 and 2 can be applied to a thin-walled housing in which a metal plate and a resin covering at least one surface thereof are integrally molded by injection molding of the resin.

On the other hand, in applications such as desktop type personal computers and word processors where there is no fear of damage due to dropping or the like, ordinary general-purpose resins can be used as the resins used, as in the case of FIGS. 1 and 2. ,
When an in-mold component such as a casing that is used in a molding method for portable equipment such as a handy terminal is used, a sudden impact force due to a fall or the like cannot be absorbed in the casing or the in-mold component, and as a result, the casing is The device itself may be damaged or the internal electronic device may be defective.

FIG. 3 exemplifying a panel similar to FIG. 1 is a view for explaining an in-mold molded body in consideration of such a point and its molding method, and (3-1) is a perspective view showing an example of a housing. , (3-2) is a diagram showing only the reinforcing metal plate extracted.

In FIG. 3, a housing 4 as a portable device such as a handy terminal is formed with a plurality of bosses 4b and ribs 4c at required positions on the bottom surface surrounded by an outer frame 4a as a peripheral wall.

The casing 4 is required to be thin and light in weight to meet the demand for downsizing, and tough enough not to be broken even when dropped. Therefore, as shown in (3-2), the boss 4b
There are holes at each position corresponding to
Al with a thickness of about 0.4 mm where 41a and 41b are formed respectively
After degreasing and cleaning the plate 41 in the same manner as in FIG. 1, the thermosetting adhesive 22 described in FIG. 1 is applied to the resin bonding surface (lower surface in the figure) 41c of the Al plate 41 with a uniform thickness by using, for example, a spray. And then dry at 120 ° C for about 15 minutes to obtain a semi-cured state.

Next, the Al plate 41 is positioned and mounted in a mold (not shown), for example, the temperature is 100 ° C., the injection setting pressure is 4
Thermoplastic polyester elastomer (trade name: Hytrel 4057 “Toray Industries, Inc.” under the conditions of 00 kg / cm ² and injection time of 1 second
As shown in (3-1) and its enlarged boss extraction cross section (a) and rib extraction extraction cross section (b), at least the bottom surface is Al plate 41 and thermoplastic. The housing 4 including the polyester elastomer layer 42 can be configured.

The case 4 according to such an in-mold molding method
Since it is made up of a thin Al plate 41 having elasticity and a thermoplastic polyester elastomer layer 42 having flexibility, it must be able to withstand a large impact force without causing breakage even by a sudden impact such as a drop. You can

It should be noted that when a portable device assembled with a casing formed by injection molding a polycarbonate resin instead of the thermoplastic polyester elastomer was dropped from a height of 1 m onto a concrete surface, the casing was damaged. It is experimentally confirmed that when the portable device assembled in the housing 4 is dropped under the same condition, not only the housing 4 is damaged but also no abnormality as a device occurs.

However, in the in-mold molding method described with reference to FIGS. 1 to 3, since the thermosetting adhesive is used, the semi-cured state becomes unstable, and as a result, the adhesive strength tends to vary. Therefore, special techniques such as controlling temperature / humidity and time are required to maintain the semi-cured state.

For example, FIG. 4 exemplifies a case in which a resin is in-molded and integrated on the head of a rivet-shaped metal part, and the in-mold molding method in consideration of this point is shown step by step. -1) shows the adhesive application state, (4-2) shows the in-mold state, and (4-3) shows the in-mold product.

That is, in (4-1) of the figure, the rivet-shaped metal part 51 is degreased and washed with acetone and ethanol as in the case of FIG. Therefore, a nitrile rubber adhesive (Bond G100 “made by Konishi Co., Ltd.”) 52, which is a heat-resistant rubber adhesive, is applied to a required area of the rivet-shaped metal part 51 (top surface 51a in the figure) 52, for example, by using a spray 55. Apply evenly to a thickness of about 20 μm.

Next, the rivet-shaped metal part 51 coated with the adhesive 52 is dried at 80 ° C. for 10 minutes to volatilize the solvent in the adhesive and set in the mold 56 shown in (4-2). Then
For example, molding temperature 230 ℃, mold temperature 70 ℃, injection set pressure 3
Riveted metal as shown in (4-3) by injecting ABS resin (acrylonitrile-butadiene-styrene resin) 53'as a general-purpose resin under pressure under the conditions of 00Kg / cm ² and injection time of 1 second. In-mold component 54 in which component 51 and ABS resin component 53 are integrated via nitrile rubber adhesive 52
Can be configured.

In such an in-mold molding method, it is not necessary to maintain an unstable semi-cured state, and since the nitrile rubber adhesive 52 itself becomes rubber-like due to the volatilization of the solvent, there is no flow at the time of molding. It is possible to obtain an in-mold component having excellent strength.

Further, since the adhesive 52 is highly flexible and elastic, the bending stress and impact resistance of the in-mold component 54
It also has the effect that it is unlikely to come loose or fall off even with vibration. According to the results of experiments comparing in-mold parts having the same shape, the in-mold parts using the thermosetting adhesive shown in FIGS. 1 and 2 are sample 1, the above-mentioned in-mold parts in FIG. 4 are sample 2, and the in-mold parts shown in FIG. Assuming that the in-molded component in which the nitrile rubber adhesive 52 is applied by manual means such as a spatula is sample 3, the adhesive strength of sample 1 is 2.1 Kgf / cm.
, Whereas the ^2, Sample ² 90.5Kgf / cm 2, the sample 3 30.6Kgf / cm ² next, the effect due to heat the rubber adhesive was confirmed, that the adhesive force by the sample 3 is smaller than the sample 2 Is due to whether or not the coating thickness of the nitrile rubber adhesive 52 is uniform.

The upper surface 51 of the rivet-shaped metal part 51
If sample 4 is an in-mold part formed by roughening a with sandpaper of mesh # 100 and then undergoing the same process as in FIG. 4, the adhesive strength between the metal part and resin of sample 4 is 113.4 Kgf / cm. We have confirmed experimentally that it can be raised to ² .

The same effect can be obtained by using a chloroprene rubber adhesive belonging to the same heat-resistant rubber adhesive in place of the nitrile rubber adhesive, and the in-mold component described above with reference to FIG. It goes without saying that the same effect can be obtained by replacing

FIG. 5 is a diagram in which the above-mentioned in-mold forming method is applied to impart toughness to the housing described in FIG. 3, and (5-1) represents the metal plate described in FIG. 5-2) is a diagram explaining the molding method, and (5-3) is a representation of the cross section of the product.

In (5-1) of the figure, the Al plate 41 is the same as that described in FIG. 3 and has been degreased and washed as in FIG. Therefore, as shown in the figure, the nitrile rubber adhesive 52 described in FIG. 4 is applied to one side (the upper side in the figure) of the Al plate 41 by spraying to a thickness of about 20 μm, and then dried at 80 ° C. for about 10 minutes. The solvent in the adhesive is volatilized and dried.

Then, the Al plate 41 coated with the adhesive is treated with (5
-Set the mold 66 capable of double molding as shown in -2), and on the adhesive coating side, for example, resin temperature 230 ℃, mold temperature 70 ℃, injection set pressure 500Kg / cm ² , injection time 1 second. Under normal conditions, a normal ABS resin 53 'is injected under pressure as a general-purpose resin, and a boss 53c made of ABS resin, a rib 53d, and, if necessary, the boss 53c made of ABS resin, and the necessary outer frame portion on the surface. The outer frame 53e etc. are molded.

Then, from the other side of the mold 66, for example, a styrene thermoplastic elastomer (trade name: Tuftec S) is used.
2974 "Asahi Kasei Co., Ltd.") 61 'is injected under pressure at a resin temperature of 220 ° C., a mold temperature of 70 ° C., an injection set pressure of 400 Kg / cm ² , and an injection time of 1 second to form the thermoplastic elastomer layer 61. By molding the outer shape of the housing so that the total thickness including the thickness is the required thickness (for example, 1 mm), the boss can be formed as shown in (5-3) and its enlarged sectional view (c). It is possible to configure the housing 6 as a composite in-molded product in which the 53c, the rib 53d, and the inner surface 53e of the outer frame are made of ABS resin (general-purpose resin) and at least the bottom surface is made of the Al plate 41 and the thermoplastic elastomer layer 61.

The thermoplastic elastomer layer 61 is made of AB
When the portable device assembled with the casing replaced with only the S resin layer was dropped onto the concrete surface from a height of 1 m, the casing was damaged, but the portable device assembled with the casing 6 was dropped under the same conditions. At times, it is experimentally confirmed that not only the housing 6 is not damaged, but also the abnormality as a device has not occurred.

On the other hand, the triazine thiols having a 6-membered ring structure containing three nitrogen (N) as hetero atoms are generally known as surface treatment agents for metal lubrication and rust prevention. It is a surface treatment agent that is also effective for bonding metal and resin, such as being used for bonding tire wires and rubber.

Therefore, the inventors of the present invention conducted resin molding with the metal part whose surface was treated with the triazine thiol set in a mold, and the metal part and the injection resin were injected due to the adhesive effect of the triazine thiol. I thought that and would bond.

Basically, first, a metal part is washed with an organic solvent and an acid to remove dirt and oxide film on the surface, and then the metal part is immersed in a triazine thiol solution having a predetermined concentration for a predetermined time to clean the surface. A metal part, which is treated with the triazine thiol film and then the surface of which is treated with the triazine thiol, is positioned and set in a mold to inject resin under pressure.

That is, FIG. 6 shows a case where such an in-mold forming method is applied to the formation of the housing described in FIG. 3, and (6-1) represents the metal plate described in FIG. , (6-2) is a metal plate with a surface treatment layer, and (6-2)
-3) is a perspective view of an example of a housing.

In (6-1) of the figure, 41 is the Al plate described in FIG. 3, which is degreased and washed with acetone and ethanol as in FIG. Therefore, after removing the oxide film of the Al plate 41 with 15% dilute sulfuric acid, "6-sodium mercaptide-2,4-dimethylcapto-1" as a 0.02% triazine thiol solution contained in a liquid tank (not shown) was removed. 15,3,5 Triazine "(Product name: Jisnet TTN" Sankyo Kasei Co., Ltd. ")
It is immersed for a second, washed with water and ethanol, and dried to form an Al plate 41 having a surface treatment layer 71 'as shown in (6-2).

Next, the Al plate 41 having the surface treatment layer 71 'is positioned and set in a mold (not shown), and then a normal ABS resin 53' is used as a general-purpose resin at a resin temperature of 2
By pressurizing and injecting under conditions of 30 ℃, mold temperature of 80 ℃, injection set pressure of 500Kg / cm ² and injection time of 1 second (6-3) and its extracted enlarged sectional view (d), the boss 53c A housing 7 similar to that shown in FIG. 3 can be constructed in which at least the bottom surface including the ribs 54d and the rib 54d is formed by in-mold molding of the Al plate 41 and the ABS resin 53.

In this case, when the portable device assembled in the casing 7 is dropped under the same conditions as in FIG. 3, the casing 7 is damaged as in the casing 3 in FIG. 3 and the casing 5 in FIG. Not only did the device malfunction, but it was possible to confirm experimentally that the same adhesive strength as that of each of these housings was obtained.

It has been experimentally confirmed that the same effect can be obtained by injecting a resin in which the surface treatment agent is mixed into the metal component not subjected to the above surface treatment under pressure. It was also experimentally shown that an equivalent effect can be obtained by using an ABS resin having a polycarbonate group, that is, an ABS-PC alloy resin (trade name: Moncalloy "Monsanto Kasei Co., Ltd.") instead of the ABS resin 53. Have confirmed.

In particular, in such an in-mold molding method, the surface treatment means for the metal part only immerses the metal part in the solution, and the treatment time is completed within the range of several seconds to several minutes, so that the productivity is improved. Has a high merit.

FIG. 7 is a sectional view showing a case where the in-mold molding method described in FIG. 6 is applied to the formation of the boss in FIG. 3, and (7-1) shows a state by the conventional molding method. Fig. 6 shows the state by the forming method of Fig. 6, and (7-
2) shows the state by the forming method of FIG.

That is, for example, in the conventional in-mold molding method for forming the boss 4b of FIG. 3, as shown in (7-1), the Al plate 41 having the hole 41a for the boss is provided in the corresponding region. Resin is pressurized and injected from a runner (not shown) in a state where the mold 76 having the cavity 76a for the boss 4b is positioned and set.

On the other hand, in the in-mold molding method of the present invention for forming the boss 53c 'corresponding to the boss 53c in FIG. 6 corresponding to the boss 4b, for example, the adhesive force between the metal part and the molding resin as described in FIG. Therefore, as shown in (7-2) of the figure, the metal plate 72 on the entire surface of which the surface treatment layer 71 'made of the triazine thiol solution described in FIG. 6 is formed is used as the mold 76 having the cavity 76a for the boss. The resin was pressure-injected while the positioning setting was made to form the required boss 53c '.

In the boss 53c 'formed by such an in-mold molding method, the adhesive force to the metal plate 72 is the above-mentioned boss.
It was confirmed experimentally that the strength was almost the same as that of 4b.

Since the method of forming the boss 53c 'can be similarly applied to the rib 53d in FIG. 6, the metal plate (Al plate 72 in the figure) is provided with holes for bosses and ribs (41a in the figure). , 41b) can be eliminated and the mold structure can be simplified, and further improvement in productivity can be expected.

The above-mentioned triazine thiols are copper.
(Cu) or its alloys have strong reactivity with copper-based metals or nickel (Ni) -based metals, so when using metal parts made of materials other than such copper-based metals or nickel-based metals, copper or It has been experimentally confirmed that it is desirable to perform nickel plating treatment.

[0066]

As described above, according to the present invention, it is possible to provide an in-mold molding method in which the adhesive strength between a metal part and a resin is increased to improve productivity, and a thin-walled housing using the same. .

[Brief description of drawings]

FIG. 1 is a diagram illustrating an in-mold molded body using a thermosetting adhesive, including a molding method thereof.

FIG. 2 is a diagram for explaining another embodiment of FIG.

FIG. 3 is a diagram illustrating an in-mold molded body in which the injection molding resin of FIG. 1 is replaced with a thermoplastic elastomer, including a molding method thereof.

FIG. 4 is a process diagram showing an in-mold molding method using a heat-resistant rubber adhesive.

5A to 5C are diagrams for explaining the process by applying FIG. 4 to a housing.

FIG. 6 is a diagram illustrating an in-mold molding method using a metal surface treatment agent.

FIG. 7 is a diagram for explaining another embodiment of FIG.

FIG. 8 is a diagram showing a conventional in-mold molding method together with a configuration example.

[Explanation of symbols] 2,3 Panels 2 ', 3' Samples 4,6,7 Housings 4a, 53e Outer frames 4b, 53c, 53c '
Boss 4c, 53d Rib 11,21,41,72 Al plate (metal plate) 11a, 21a
Mounting hole 11b Anchor hole 22 Thermosetting adhesive 23,31 Polycarbonate resin layer 23 'Polycarbonate resin 26,56,66,76 Mold 41a, 41b Hole 41c Resin bonding surface 42 Polyester elastomer layer 51 Rivet-shaped metal part 51a Top surface 52 Nitrile rubber adhesive (heat resistant rubber adhesive) 53 ABS resin parts 53 'AB
S resin 54 In-mold parts 55 Spray 61 Thermoplastic elastomer layer 61 'Thermoplastic elastomer 71' Surface treatment layer 76a Cavity

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Muratani 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa, Fujitsu Limited (72) Inventor Kennobu Ishizuka 1015 Kamedota, Nakahara-ku, Kawasaki, Kanagawa Prefecture, Fujitsu Limited

Claims (9)

[Claims] 1. An in-mold molding method in which metal and resin are integrated and injection-molded, and an adhesive (22) is substantially uniform on at least the joint surface of the metal part (21) to be in-mold molded with the resin. The metal part (21) is applied to a predetermined thickness, and then the metal part (21) is positioned and set at a predetermined position in the mold (26). An in-mold molding method characterized in that 23) is injected under pressure to be integrally molded with the metal part (21). 2. An in-mold molding method, characterized in that the joint surface of the metal component according to claim 1 with the resin is roughened. 3. The adhesive of the metal part placed in the mold according to claim 1 is a thermosetting adhesive in a semi-cured state or a heat-resistant rubber adhesive in a dried state. In-mold molding method. 4. An in-mold molding method, wherein the heat-resistant rubber-based adhesive according to claim 3 is a nitrile rubber-based or chloroprene rubber-based adhesive. 5. An in-mold molding method for integrally molding a metal and a resin, wherein at least a joint surface of the metal part (41) to be in-molded with the resin is treated with a triazine thiol-based surface treatment agent. After forming a surface treatment layer, the metal parts (41)
Is set to a predetermined position in the mold and set, and thereafter, the resin melted by heating is injected under pressure into a required area of the metal part (41) to be integrally molded with the metal part. In-mold molding method. 6. Single molding by pressure injection of a general-purpose resin or thermoplastic elastomer, or composite molding by sequential pressure injection of both of the integrated molding of the resin according to claim 1 and claim 6 with a metal part. An in-mold molding method characterized by the following. 7. An in-mold molding method, wherein 6-sodium mercaptide-2,4-dimethylcapto-1,3,5 triazine is used as the triazine thiol-based surface treatment agent according to claim 6. . 8. A thin casing integrally formed by injection molding of a metal plate and a resin covering at least one surface thereof, wherein the metal plate (41) is adhered to and formed on the joint surface of the metal plate (41) with the resin. A resin that is integrally molded with the metal plate via a semi-cured thermosetting adhesive (22) or a dry heat-resistant rubber adhesive (52),
Single molding with general-purpose resin (53) or thermoplastic elastomer (61), or general-purpose resin (53) and thermoplastic elastomer (6)
A thin-walled housing characterized by being formed by composite molding by sequential molding with 1). 9. A thin-walled housing in which a metal plate and a resin covering at least one surface thereof, a resin member fixed to the metal plate, or both are integrally molded by injection molding of the resin. 41) A thin casing characterized in that the resin (53) and the resin (53) are bonded to each other with a surface treatment layer (71 ′) of the metal plate (41) using a triazine thiol surface treatment agent.