TW201321161A - Insert molded article and heat dissipation structure - Google Patents

Abstract

The invention is to provide an insert molded article that can be manufactured by a method having high productivity, in which the adhesive force between a resin member and a metal member is enough, and the heat transmission between the resin member and the metal member is smooth. The insert molded article includes the resin member and the metal member, wherein the metal member has two or more joining holes formed to be scattered on the faying surface with the resin member, the resin member has projections inserted in the joining holes, the area of at least one opening of the joining hole is at least 0.44 mm<SP>2</SP> and at most 19.63 mm<SP>2</SP>, when the area of the surface enclosed by the periphery of the faying surface of the resin member and the metal member is S1, and the all total of the areas of the openings of the joining holes is S2, the proportion S2/S1 satisfies a specific inequality (I).

Description

Embedded molded body and heat dissipation structure

The present invention relates to an insert molded body and a heat dissipation structure.

A composite product in which a metal member such as aluminum or an aluminum alloy is integrated with a resin member composed of a thermoplastic resin composition, and a built-in member or interior decoration of a vehicle such as a control box used for an instrument panel External components such as parts, digital cameras, or mobile phones.

As a method of integrating the resin member and the metal member, there is a method of using an adhesive or a double-sided tape; or a fixing member such as a folded piece or a hook is provided on the metal member and/or the resin member, and the fixing member is used. The method of fixing the two; the method of joining using screws or the like. Among them, the method using an adhesive is a simple method and is frequently carried out.

Here, the adhesive for integrating a metal member or the like with the resin member is expensive. Further, in the production of the above-described composite product, since the molding process of the resin member and the metal member is performed separately, it is necessary to integrate it later, and thus the productivity of the composite product is lowered.

In order to solve the above-mentioned problem, it is known that a metal member or the like is placed in a cavity of a mold for injection molding, and a thermoplastic resin composition in a molten state is emitted into a cavity to be manufactured. A method of integrating a metal member and a resin member into a composite product. This manufacturing method is known as an insert molding method, and the composite produced by this method is an insert molding.

According to the above-described insert molding method, since it is not necessary to use an adhesive, the manufacturing cost of the composite can be reduced. Moreover, since the resin member and the metal member are integrated in the molding process of the resin member in the insert molded body, the productivity is also superior to the method using the adhesive.

However, the embedded molded body has a problem that the adhesion between the resin member and the metal member is small compared to the composite manufactured by using an adhesive or the like. Therefore, it is known to roughen the surface of the metal member before the insert molding, and insert the molding by bringing the rough surface into contact with the resin member, thereby improving the adhesion between the metal member and the resin member (for example, refer to Patent Document 1).

First patent document: [patent literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2001-225352

According to the technique described in Patent Document 1, the adhesion between the resin member and the metal member can be improved by roughening the metal member. However, the roughening process is necessary, and the productivity of the embedded molded body is low.

Further, in the case of the method described in Patent Document 1, the adhesion is insufficient only for the insert molding, and the annealing treatment is required to improve the adhesion. Since the annealing treatment is a time-consuming process, the productivity of the insert molded body is lowered.

In the case of the method described in Patent Document 1, the heat between the resin member and the metal member is difficult to be transmitted, and therefore, the method described in Patent Document 1 is used for the application of high thermal conductivity between the resin member and the metal member. It can't be said that it is very suitable.

The present invention has been made to solve the above problems, and an object of the invention is to provide a method for producing a product having high productivity and a sufficient adhesion between a resin member and a metal member, and between the resin member and the metal member. The heat transfer is smoothly embedded in the molded body.

The inventors of the present invention have repeatedly conducted intensive research to solve the above problems. As a result, it has been found that an embedded molded body including a resin member having two or more joining holes formed by a joint surface with the resin member, and a metal member having a convex portion inserted into the joint hole. at least one engagement opening portion of the aperture area of 0.44mm ² or less than 19.63mm ^2, the peripheral area of the surface of the bonding surface of the resin member and the metal member is surrounded S _1, in the above-described bonding surface of the bonding hole When the sum of the areas of the openings is S ₂ , the above problem can be solved by satisfying the following inequality (I) by setting the ratio S ₂ /S ₁ , and the present invention can be completed. More specifically, the present invention provides the following.

(1) An insert molded body comprising an insert molded body comprising a resin member and a metal member, wherein the metal member has two or more joining holes formed by a joint surface with the resin member, and at least one the engagement hole of the opening portion of an area of 0.44mm ² or less than ² 19.63mm, the resin member has a convex portion is inserted into the engaging hole, the area of the peripheral surface of the bonding surface of the resin member and the metal member is surrounded by the S _1. When the total area of the openings of the joint holes on the joint surface side is S ₂ , the ratio S ₂ /S ₁ satisfies the following inequality (I).

0.04≦S ₂ /S ₁ ≦0.80 (I)

(2) to (1) described in the insert molded, wherein, at least a portion of the area of the opening of the engaging holes is 0.64 mm ² or less than ² 3.14mm.

(3) The insert molded body according to the above aspect, wherein the joint hole is formed to be distributed over the entire joint surface.

(4) (1) to (3) described in any one of a molded insert, wherein the sum of the bonding area to the area of the area S _1, all of the engagement hole of the resin member and the metal member is a ratio of S S _{3 3} / S _1, lines satisfy the following inequality (II).

0.3≦S ₃ /S ₁ ≦3 (II)

(5) The insert molding according to any one of (1) to (4), wherein the joint hole is a through hole penetrating the metal member.

(6) The insert molded body according to any one of (1) to (5), wherein a cross-sectional area of at least a part of the joint hole in a depth direction of a predetermined depth of the joint hole is deeper than the predetermined depth The cross-sectional area of the aforementioned depth direction is small.

(7) The insert molding according to any one of (1) to (6) wherein the metal member is formed by aluminum die casting.

(8) The insert molding according to any one of (1) to (7) wherein the resin member is made of a thermoplastic resin, and the thermoplastic resin is The glass transition temperature (Tg) - 0 ° C or more Tg + 180 ° C or less is annealed.

(9) A heat dissipating structure, comprising: a heat source according to any one of (1) to (8), wherein the resin member is a heat receiving portion that receives heat from the heat source, and the metal The member is a heat radiating portion that dissipates heat of the resin member by heat, and the thermal conductivity of the resin member is 1 W/(mk) or more and 20 W/(mk) or less, and the thermal conductivity of the metal member is 20 W/(mk) or more and 300 W/ (mk) below.

The insert molding of the present invention can be produced by a method of high productivity, and the adhesion between the resin member and the metal member is sufficient, and the heat conduction between the resin member and the metal member is smooth.

Hereinafter, embodiments of the present invention will be described. Further, the present invention is not limited to the following embodiments.

<First Embodiment>

Fig. 1 is a view schematically showing the insert molded body of the first embodiment, wherein (a) is a perspective view and (b) is a MM cross-sectional view.

As shown in Fig. 1, the insert molded body 1 of the present embodiment includes the metal member 10 and the resin member 20. As shown in FIG. 1, the resin member 20 is formed by laminating the metal member 10. Further, as shown in FIG. 1(b), the resin member 20 enters a hole formed in the metal member 10 (joining hole to be described later) in.

Fig. 2 is a view schematically showing the metal member 10, (a) is a perspective view, (b) is a plan view, and (c) is a NN sectional view.

As shown in Fig. 2, the metal member 10 is a plate-shaped member. Further, the metal member 10 constitutes one surface of the metal member 10, and has a joint surface 11 which is in contact with the resin member 20, which will be described later, and two or more joint holes 12 which are formed by the joint surface 11.

The joint surface 11 is a surface that is in contact with the resin member 20 and is a surface formed by the joint hole 12. In the present embodiment, the joint surface 11 is a flat surface of the plate. However, the shape of the joint surface 11 is formed so as to be in contact with the resin member 20, and the joint hole 12 is formed, that is, it is not particularly limited, and may have a curved shape.

The joint hole 12 is a hole formed in the joint surface 11 and is a portion into which the convex portion of the resin member 20 to be described later is inserted. In the present embodiment, nine engagement holes 12 are formed on the joint surface 11, and all of the nine joint holes 12 have the same shape. In the present embodiment, the shape of the joint hole 12 is formed in a cylindrical recessed portion of the joint surface 11.

Further, the joint hole 12 is formed by being scattered on the joint surface 11. The term "scattered" means that the joint holes 12 are arranged at appropriate intervals on the joint surface 11, and are not necessarily equal intervals. Further, in the present embodiment, it is preferably distributed over the entire joint surface 11. In the present invention, it is preferable that the joint hole 12 is formed to be distributed over the entire joint surface 11.

Further, in the present invention, the above inequality (I) satisfies the at least one engagement hole 12 of the opening area of 0.44mm ² or less than ² 19.63mm. The number of the engagement holes 12 and the shape of the engagement holes 12 are not particularly limited. Further, it is sufficient that the engagement holes 12 are formed on the joint surface 11 at any interval. Further, the shapes of the two or more joining holes 12 may be different from each other.

The joint hole 12 needs to be formed on the joint surface 11 by satisfying the following inequality (I). In the inequality (I), the area surrounded by the outer periphery of the joint surface of the metal member 10 and the resin member 20 is S ₁ , and the sum of the areas of the openings of the joint holes on the joint surface side is S ₂ .

0.04≦S ₂ /S ₁ ≦0.80 (I)

The "area S ₁ " refers to the area of the surface surrounded by the outer periphery of the joint surface, and is an area in which the metal member 10 and the resin member 20 are in contact with each other without the joint hole 12 being considered. In the present embodiment, the area S ₁ is the area of the total area S ₂ of the opening of the joint hole 12 (the area of the mesh portion of Fig. 2(b)), which is removed from the area of the joint surface 11, and all the joints are added. The sum of the areas of the inner wall faces of the holes 12 (i.e., the inner surfaces of the recesses constituting the engaging holes 12). The area S ₁ can be derived as described above even if the joint surface 11 has a complicated shape such as a curved surface or the inner surface of the concave portion forming the joint hole 12 is a complicated situation.

The "area of the opening of the joint hole 12" means the area around the opening edge of the joint hole 11 at the joint surface 11. Therefore, the "total area S ₂ of the opening of the joint hole 12" means the area after the area surrounded by the opening edge of each of the joint holes 12 is added.

In the present embodiment, as described above, at least one opening hole 12 of the engagement area of 0.44mm ² or less than ² 19.63mm, at least one area of the opening of the engagement hole 12 in the 3.14mm ² or less than 0.64 mm ² Better. Further, the more the area of the opening of the joint hole 12 is in the above range, the area of the opening of all the joint holes 12 is the best in the above range.

Further, in the present invention, the area S _1, the sum of the bonded area of the resin member within all of the engaging hole 1220 and the metal member 10 of the area S ₃ of the ratio S ₃ / S _1, satisfy the following inequality (III) is good.

0.3≦S ₃ /S ₁ ≦3 (III)

The area S ₃ of the sum of the joint areas of the resin member 20 and the metal member 10 in all the joint holes 12 means the inner wall surface of all the joint holes 12 into which the resin member 20 enters (that is, the joint hole 12 is formed). The sum of the areas of the inner surfaces of the recesses.

Moreover, the type of the metal constituting the metal member 10 is not particularly limited, and a preferable metal can be suitably used depending on the application and the like. For example, metals such as steel, cast iron, stainless steel, aluminum, copper, gold, silver, and brass may be alloys such as aluminum alloys, zinc alloys, magnesium alloys, and tin alloys.

The method for producing the above metal member is not particularly limited, and a known method can be employed. For example, a high-pressure casting method in which a casting method of a high-precision casting can be mass-produced in a short time by pressing a molten metal into a mold can be cited. Further, in order to form the metal member 10 to be formed into a desired shape, cutting by a working machine or the like may be used.

In general, it is known that it is difficult to improve the adhesion to a resin member to be described later by a metal die-cast product produced by a high-pressure casting method. However, in the present invention, an aluminum die-cast product may be suitably used. Metal components.

Fig. 3 is a view schematically showing the resin member 20, (a) is a perspective view, (b) is a bottom view, and (c) is an OO sectional view. The resin member 20 is made of heat The plastic resin composition is formed to be formed on the metal member 10. As shown in Figs. 1 and 3, in the present embodiment, the resin member 20 is a plate-shaped member. The resin member 20 is formed as one surface of a plate shape, and has a resin side joint surface 21 that is in contact with the joint surface 11 of the metal member 10, and a convex portion 22 formed on the resin side joint surface 21.

The resin side joint surface 21 is a portion of the resin member 20 that is in contact with the joint surface 11 of the metal member 10. In the present embodiment, the resin-side joint surface 21 is formed in a planar shape. However, the shape of the resin-side joint surface 21 in the present invention is not particularly limited, and may be, for example, a curved surface.

The convex portion 22 is formed on the convex portion of the resin joint surface 21, and a plurality of convex portions 22 are formed on the resin side joint surface 21. The convex portion 22 is formed by entering the thermoplastic resin composition in a molten state at the time of insert molding into the joint hole 12. Therefore, the shape of the convex portion 22 is cylindrical. Further, in the present embodiment, all of the convex portions 22 are inserted into the joint hole 12 with almost no gap.

In the present invention, at least two convex portions 22 may be inserted into the joint hole 12, and the number of the convex portions 22 inserted into the joint hole 12 may be three or more, and the convex portion 22 may not be inserted into a part of the joint holes 12. Further, in the present invention, the shape of the convex portion 22 is not particularly limited. As described above, since the convex portion 22 is formed at the time of insert molding, the shape of the convex portion 22 may be a shape corresponding to the shape of the concave portion forming the joint hole 12. .

Further, the thermoplastic resin composition constituting the resin member 20 is not particularly limited, and a thermoplastic resin composition containing the selected thermoplastic resin can be used depending on the application and the like. As a specific example of a thermoplastic resin, A hydrocarbon-based resin, a polyester-based resin, a polyacetal-based resin, a polyarylene sulfide-based resin, a liquid crystalline resin, or the like is exemplified. Further, the thermoplastic resin composition used in the present invention may contain a plurality of thermoplastic resins.

In addition, the thermoplastic resin composition may contain a known agent such as a reinforcing agent such as glass fiber, an oxidation inhibitor, a stabilizer, a plasticizer, or a pigment, as long as it does not impair the effects of the present invention. Other components than plastic resins.

<Method of Manufacturing Inserted Shaped Body>

The method for producing the insert molded body of the present invention is not particularly limited, and a general insert molding method in which a metal member is placed in a mold and the thermoplastic resin composition is projected into the mold can be employed. Further, the conditions for the injection molding can be appropriately set depending on the components contained in the thermoplastic resin composition and the like.

Further, in the present invention, the resin member embedded in the molded body may be annealed under the conditions of a glass transition temperature (Tg) of -0 ° C or more and Tg + 180 ° C or less of the thermoplastic resin constituting the resin member.

<effect>

The insert molded body 1 of the present embodiment includes an insert molded body of the resin member 20 and the metal member 10. The metal member 10 has an engagement hole 12 formed in the joint surface 11 with the resin member 20, and the convex portion 22 of the resin member 20 is inserted into the joint hole 12. In the insert molded body 1 of the present embodiment, the metal member 10 has the following configuration of (α) to (γ), and the adhesion between the resin member 20 and the metal member 10 is improved.

(α) Two or more engagement holes 12 are formed by the joint surface 11

(beta]) at least one opening of the engaging hole 12 of an area of 0.44mm ² or less than ² 19.63mm.

The area of the surface surrounded by the periphery of the joint surface of the (γ) resin member 20 and the metal member 10 is S ₁ , and when the total area of the opening of the joint hole 12 on the joint surface 11 side is S ₂ , the ratio S ₂ /S ₁ , the following inequality (I) is satisfied.

0.04≦S ₂ /S ₁ ≦0.80 (I)

That is, on the joint surface 11, by forming the joint hole 12 having a specific opening area satisfying the number of inequalities (I), the adhesion between the metal member 10 and the resin member 20 can be improved.

Further, the embedded molded body includes the above-described configuration, and heat transfer between the metal member 10 and the resin member 20 is smooth.

In particular, the plurality of joint holes 12 formed in the joint surface 11 are formed slightly uniformly over the entire joint surface 11, and the effect of improving the adhesion between the metal member 10 and the resin member 20 can be further enhanced. Moreover, the heat transfer between the metal member 10 and the resin member 20 is also more uniform.

In particular, the engagement hole 12 of the opening area, when the density is more than 0.64 mm ² 3.14 mm ² or less, then the metal member 10 and the resin member 20 of the focus on improving effect, excellent in thermal conduction effect is more improved.

In particular, the sum of the area of the bonded area of the resin component within the resin member projection 20 of the engagement hole 22 is inserted into the 1220 and the metal member 10 of the _{S. 3} of the ratio of the above-described area S of ₁ S ₃ / S _1, as long as In the following inequality (II), the adhesion between the metal member 10 and the resin member 20 can be improved, and the effect of excellent heat conduction can be further improved.

0.3≦S ₃ /S ₁ ≦3 (II)

The insert molded body 1 of the embodiment can be used without using an adhesive or the like. The adhesion between the metal member 10 and the resin member 20 in the embedded molded body is improved. Therefore, the insert molded body 1 of the present embodiment has higher productivity than the insert molded body produced by using an adhesive or the like.

Further, in the insert molding of the present invention, the adhesion between the metal member 10 and the resin member 20 is high even in the production of the insert molded body without performing the annealing treatment. Thus, since the annealing process can be omitted, the insert molded body of the present invention can be manufactured with high productivity.

Further, in general, after the insert molding, an annealing treatment may be applied, and by applying an annealing treatment to the insert molded body, the adhesion between the resin member and the metal member can be further improved.

Moreover, the above-described effects of improving the adhesion between the metal member 10 and the resin member 20 and the like are also effective when the metal member 10 is made of an aluminum die-cast product. In the case of the conventionally used method, when the metal member 10 is made of an aluminum die-cast product, it is difficult to roughen the aluminum die-casting product by chemical etching or the like. Therefore, the adhesion between the resin member 20 and the metal member 10 is increased. Particularly difficult. However, as described above, according to the present invention, even when the metal member 10 is formed of an aluminum die-cast product, the adhesion between the resin member and the metal member can be improved.

<Second embodiment>

Next, a second embodiment of the insert molded body of the present invention will be described with reference to Fig. 4 . The insert molded body 1A of the present embodiment is a rectangular parallelepiped shape as in the insert molded body 1 of the first embodiment, and Fig. 4 is a view schematically showing a cross section of the insert molded body 1A of the second embodiment. Further, with regard to the description of the second embodiment, the same configuration is required. The same reference numerals are given to the same symbols, and the description thereof is omitted or simplified.

The insert molded body 1A of the second embodiment is mainly different from the first embodiment in that the joint hole 12A formed in the joint surface 11A of the metal member 10A is a through hole that penetrates the joint surface 11A and the inner surface thereof.

Further, the engaging holes 12A, 11A through the results of its bonding face of the back side of the resin member 20 and the metal member 10 of the area S _1, the resin member 20A of the projecting portion 22A of the insert 20A and the metal member bonding resin member within bore 12A The area S ₃ of the sum of the joint areas of 10A is different from that of the second embodiment in the first embodiment, but these areas can be determined by the method described in the first embodiment.

The insert molded body 1A of the second embodiment can be produced in the same manner as the method of inserting the molded body 1 of the first embodiment.

According to the insert molding 1A of the second embodiment, in addition to the effect of the insert molding 1 of the first embodiment, the following effects are obtained.

In the insert molding 1A of the second embodiment, the joint hole 12A formed in the joint surface 11A of the metal member 10A penetrates the surface of the joint surface 11A and the back side thereof, so that the area of the joint surface of the metal member 10 and the resin member 20 becomes The effect of making the metal member 10A and the resin member 20A adhere to each other is improved.

<Third embodiment>

Next, a third embodiment of the insert molded body of the present invention will be described with reference to Fig. 5. The insert molding 1B of the present embodiment is the same as the insert molding 1 of the first embodiment, and the insert molding 1A of the second embodiment has a rectangular parallelepiped shape, and the fifth embodiment schematically shows the third embodiment. A diagram of a cross section of the molded body 1B.

The insert molding 1B of the third embodiment is mainly configured such that the joint hole 12B formed in the joint surface 11B of the metal member 10B is a through hole penetrating through the joint surface 11B and the back surface thereof, at least in a part of the joint hole 12B. The cross-sectional area in the depth direction of the predetermined depth of the joint hole 12B is smaller than the cross-sectional area in the upper depth direction at a position deeper than the predetermined position described above, and is different from the first embodiment.

The shape of the engaging hole 12B is a shape in which two cylindrical holes extending in the through direction (depth direction of the engaging hole 12B) are joined together. The radius of the cross section of the columnar hole on the joint surface 11B side in the penetration direction is smaller than the radius of the cross section of the columnar hole in the back side of the joint surface 11B. Therefore, in the portion where the two cylindrical holes are joined, there is a stepped anchor portion 13B.

In the case where the insert molded body 1B is produced by a general insert molding method, the convex portion 22B of the resin member 20B is formed by flowing a thermoplastic resin composition in a molten state in the joint hole 12B. Therefore, when the anchor portion 13B is formed in the joint portion 12B, the convex portion 22B has a shape in which two columns extending in the extending direction of the convex portion 22B are joined together as shown in Fig. 5.

The insert molded body 1B of the third embodiment can be produced by the same method as the insert molded body 1 of the first embodiment.

According to the insert molded body 1B of the third embodiment, in addition to the effect of the insert molded body 1 of the first embodiment described above, the following effects are obtained.

The metal member 10B of the insert molded body 1B of the third embodiment has the anchor portion 13B as described above. Therefore, as shown in Fig. 5, in the embedded molded body In the joint hole 12B of 1B, the convex portion 22B of the resin member 20B is formed by hooking the anchor portion 13B. As a result, the metal member 10B and the resin member 20B become difficult to separate.

As described above, the anchor portion 13B is a portion that hooks the convex portion 22B. As in the present embodiment, if the hooked portion is annular, the effect of the metal member 10B and the resin member 20B being separated from each other is further improved.

<Other Modifications>

Although the preferred embodiments of the insert molded body of the present invention have been described above, the present invention is not limited to the above embodiment, and can be implemented in various forms.

In the first embodiment, the engagement hole 12 is a cylindrical recess. However, as shown in Fig. 6(a), the cross-sectional area in the depth direction of the joint hole 12 may be different at different depths. For example, in Fig. 6(a), the shape of the joint hole 12 in the depth direction is sloped. Further, in the second embodiment, the cross-sectional area in the depth direction of the joint hole 12 may be different at different depths.

Further, in the third embodiment, the cross-sectional area in the depth direction of the predetermined depth of the joint hole 12 is smaller than the cross-sectional area in the depth direction at a position deeper than the predetermined depth as described above. The anchor portion 13 can be formed by hooking the convex portion 22 into the joint hole 12. For example, as shown in Fig. 6(b), the shape of the joint hole 12 is a shape in which the cylindrical holes extending in the depth direction of the joint hole 12 are shifted and joined together. As shown in Fig. 6(b), the anchor portion 13 is formed in a portion where the two cylinders are joined.

<heat dissipation structure>

The heat dissipating structure of the present invention has the above-described insert molding of the present invention Body and heat source. As an example of the heat dissipation structure, the heat dissipation structure 2 including the insert molded body 1 of the first embodiment will be described with reference to Fig. 7. Fig. 7 is a perspective view showing the heat dissipation structure 2 of the present embodiment.

The heat dissipation structure 2 of the present embodiment includes the molded body 1 and the heat source 3, and the resin member 20 embedded in the molded body 1 is in contact with the heat source 3.

The heat source 3 is not particularly limited as long as it is a fever. For example, an integrated circuit (IC), an electronic component such as a CPU, a battery, or the like can be given. Further, in the present embodiment, the heat source 3 is in contact with the resin member 20, but the heat source 3 and the resin member 20 may not be in contact with each other.

The resin member 20 is a heat receiving portion that receives heat from the heat source 3. Further, the resin member 20 transfers heat received from the heat source 3 to the metal member 10. In order to make the heat transfer smoothly, the thermal conductivity of the resin member 20 is 1 W/m. K or more, 20W/m. Below K. Moreover, as a thermoplastic resin composition used for satisfying the above-mentioned heat conductivity repairing material, a compound for imparting a heat conductivity to a compounding agent can be added to a general thermoplastic resin.

Here, as a compounding agent for imparting thermal conductivity, metals such as gold, silver, copper, aluminum, iron, magnesium, nickel, and the like, and alloys of these metals, alumina, magnesia, cerium oxide, zinc oxide, and cerium oxide can be exemplified. Metal oxides such as oxidized ketone and cuprous oxide; metal nitrides such as boron nitride, aluminum nitride, and tantalum nitride; metal carbides such as tantalum carbide; and carbon materials such as carbon, graphite, and diamond.

The metal member 10 is a heat radiating portion that dissipates heat received from the resin member 20. The metal member 10 may be any one that radiates heat to the outside of the metal member 10. Therefore, the metal member 10 is in contact with other parts, and the heat is sent It is also possible to the part. In order to smoothly carry out the heat transfer, the thermal conductivity of the metal member 10 is 20 W/m. K above 400 W/m. Below K. A better case is at 100 W/m. K above 400 W/m. Below K. Moreover, as a metal which satisfies the conditions of the above thermal conductivity, aluminum die-casting products, copper, etc. are mentioned.

Further, the heat dissipation structure system of the present invention includes the resin member 20, and a large number of ribs or plastic columns are formed on the resin member 20. In the heat dissipation structure of the present invention, since the heat dissipation structure can be manufactured by the insert molding method, the resin member 20 can be formed and a plastic column or rib can be formed.

Further, even if the above-mentioned compounding agent is not added, the resin member 20 may not contain the above-mentioned compounding agent in the case where the above thermal conductivity is satisfied.

Further, the shape of the metal member 10 and the resin member 20 is not particularly limited, and can be determined depending on the use of the heat dissipation structure or the like.

Finally, an example of the use of the heat dissipation structure will be described. A preferred use of the heat dissipation structure of the present invention is a DC to DC power converter. The DC-to-DC power converter includes a coil that becomes a heat source 3. This coil is attached as a roll to a resin member. The heat generated in the coil is transmitted to the resin member, and is transmitted from the resin member to the metal member, and finally to the outside of the heat dissipation structure.

The shape of the resin member 20 of the DC-to-DC power converter is not particularly limited, and can be determined in consideration of the degree of easy coiling of the coil and the like. Moreover, the type of the thermoplastic resin constituting the resin member 20 is determined in consideration of heat resistance, thermal shock resistance, electric tracking resistance, etc., and in the present application, it is a thermoplastic resin, a polyarylene sulfide-based resin, and a poly-pair. The use of a butyl phthalate-based resin is preferred.

In the DC-to-DC power converter, the metal member 10 is preferably a heat sink. The heat sink is a protrusion of a sword-like or bell-shaped shape in order to make the surface area large. In order to form such a projection, excellent materiality is required for the material constituting the metal member 10 in addition to high thermal conductivity. As a material which has both high thermal conductivity and excellent formability, aluminum die-casting products are mentioned.

[Examples]

Hereinafter, the present invention will be more specifically described by showing examples and comparative examples, but the present invention is not limited to the examples.

<Method of Manufacturing Inserted Shaped Body>

The mode of the insert molded body used in the examples and the comparative examples is shown in Fig. 8. (a) is an exploded perspective view, (b) is a perspective view, and (c) is a metal member. This insert molding system was produced in the following manner. Also, the unit of the size in the figure is mm.

As the thermoplastic resin composition constituting the resin member, a polyarylene sulfide-based resin composition 1 ("RSF-10719" manufactured by Polyplastics Co., Ltd.) was used, and the thermal conductivity was 0.4 W/m.K, hereinafter referred to as "0.4W material"), polyarylene sulfide resin composition 2 ("RSF-10387" manufactured by Polyplastics Co., Ltd., thermal conductivity: 2.0W/m.K, hereinafter referred to as "2W material" ).

As the metal member, a plate composed of an aluminum die-casting ADC-12 (thermal conductivity: 96 W/m.K) was used. These plate-shaped metal members have joint faces of the portions indicated by oblique lines in Fig. 8(a). 8 joint holes on the joint surface In two columns. The metal members used are the following six types, and only the shapes of the joint holes are different.

The metal member 1 is an engagement hole that does not penetrate as shown in Fig. 2, and the concave portion of the engagement hole has a cylindrical shape. The diameter of the circle formed by the opening edge of the engaging hole was 0.5 mm. The bottom position of the recess is in the middle of the depth direction of the joint hole (the direction in which the hole extends).

The metal member 2 is a through hole penetrating as shown in Fig. 4, and the through hole of the joint hole has a cylindrical shape. The diameter of the circle formed by the opening edge of the engaging hole was 0.5 mm.

The metal member 3 is a joint hole having an anchor portion as shown in Fig. 5 and penetrates. The shape of the through hole is the same as that of Fig. 5, in which the two cylinders are joined together, and the diameter of the circle formed by the opening edge of the joint surface side engagement hole is 0.5 mm. The bottom position of the anchor portion is in the middle of the depth direction of the joint hole (the direction in which the hole extends).

The metal member 4 is an engagement hole that does not penetrate as shown in Fig. 2, and the concave portion of the engagement hole has a cylindrical shape. The circle formed by the opening edge of the engaging hole has a diameter of 1 mm. The bottom position of the recess is in the middle of the depth direction of the joint hole (the direction in which the hole extends).

The metal member 5 is a through hole penetrating as shown in Fig. 4, and the through hole of the joint hole has a cylindrical shape. The circle formed by the opening edge of the engaging hole has a diameter of 1 mm.

The metal member 6 is a joint hole having an anchor portion as shown in Fig. 5 and penetrates. The shape of the through hole is the same as that of Fig. 5, and the diameter of the circle formed by the opening edge of the joint hole on the joint surface side is 1mm. The anchor position is in the middle of the joint hole depth direction (the direction in which the hole extends).

The area S ₁ , S ₂ , S ₃ and the ratios S ₂ /S ₁ and S ₃ /S _{1 are} shown in Table 1 for each metal member. Further, as described above, since the area S1 refers to the area surrounded by the outer periphery of the joint surface of the metal member and the resin member, it does not differ depending on the opening area of the joint hole.

These metal members are placed in a mold separately for insert molding. The molding conditions are as follows. The shape of the embedded molded body is as shown in Fig. 8.

[forming conditions]

Forming machine: Sodick TR-40VR (longitudinal forming machine)

Heating cylinder temperature: 310 ° C - 320 ° C - 310 ° C - 290 ° C

Mold temperature: 160 ° C

Injection speed: 100mm/s

Pressure: 98MPa × 5 seconds

<evaluation>

For the insert molded body formed by the above method, the joint portion is joined The adhesion strength and the evaluation of thermal conductivity. The specific evaluation method is as follows.

[tightness strength]

The evaluation of the adhesion strength was carried out using a universal tensile tester UTA-50kN (manufactured by Orientek Co., Ltd.) as a measuring device at a measurement speed of 1 mm/min. Further, as shown in Fig. 9, the evaluation was carried out by arranging the embedded molded body or the bonded body on the pedestal and stretching in the direction of the arrow (the direction perpendicular to the surface of the pedestal) to measure the adhesion strength. The measurement results are shown in Table 2 (average of 3 times). The unit of adhesion strength is N. Further, in Table 2, the resin member was made into a 2W material and the 0.4W material was separately collected. The metal member in the table indicates a metal member used for inserting a molded body into a sample. For example, the metal member 1 in the table refers to the use of the metal member 1 to produce an insert molded body.

* When the insert molded body was released from the mold, one of the resin members remained on the mold side and peeled off, so that measurement was not performed.

As shown in Table 2, by forming a joint hole of a specific size in the metal member, the adhesion between the metal member and the resin member can be improved. Moreover, the effect of improving the adhesion is effective even if the embedded molded body is not subjected to annealing treatment. Further, the joint hole is a through hole, and the adhesion is further increased as long as the joint hole is formed.

[Evaluation of Thermal Conductivity]

The resin member was cut as shown in Fig. 10, and a high heat conduction heat-dissipating paste (manufactured by AS-04/Ainex Co., Ltd.) was applied to the cut surface of the resin member to contact the heater. Further, a sample was prepared by setting the shortest distance between the metal portion and the heater to 10 mm.

As shown in Fig. 10, the temperature of the entire sample after heating at 150 ° C for 20 minutes was measured. Infrared thermal imaging ("ThermaCAM CPA-7800", manufactured by Chino Co., Ltd.) was used for the measurement. The results are shown in Figure 11.

From the results of Fig. 11, it was confirmed that the thermal conductivity between the resin member and the metal member was satisfactory (to the same extent as the use of the adherend) by forming a specific joint hole, and a material having good thermal conductivity was used. As a resin material, heat conduction is also good.

1, 1A, 1B‧‧‧ embedded molded body

10, 10A, 10B‧‧‧Metal components

11, 11B‧‧‧ joint surface

12, 12B‧‧‧ joint hole

13, 13B‧‧‧ anchor

20, 20A, 20B‧‧‧ resin components

21‧‧‧Resin side joint

22, 22B‧‧‧ convex

2‧‧‧heating structure

3‧‧‧heat source

Fig. 1 is a view schematically showing the insert molded body of the first embodiment, wherein (a) is a perspective view and (b) is a MM cross-sectional view.

Fig. 2 is a view schematically showing a metal member of an insert molded body according to the first embodiment, wherein (a) is a perspective view, (b) is a plan view, and (c) is a NN cross-sectional view.

Fig. 3 is a view schematically showing a resin member of the insert molding of the first embodiment, wherein (a) is a perspective view, (b) is a bottom view, and (c) is an OO cross-sectional view.

Fig. 4 is a view schematically showing the insert molded body of the second embodiment Figure.

Fig. 5 is a view schematically showing the insert molded body of the third embodiment.

Fig. 6(a) and Fig. 6(b) are diagrams schematically showing an insert molded body according to a modification.

Fig. 7 is a perspective view schematically showing a heat dissipation structure of the embodiment.

Fig. 8 is a view schematically showing an insert molded body used in the examples and the comparative examples, wherein (a) is an exploded perspective view, (b) is a perspective view, and (c) is a metal member.

Fig. 9 is a view showing a method of evaluating the adhesion strength.

Fig. 10 (a) and (b) are views showing a method of evaluating thermal conductivity and an evaluation sample.

Fig. 11 is a graph showing the temperature of a sample heated by evaluation of thermal conductivity.

1‧‧‧Insert molded body

10‧‧‧Metal components

20‧‧‧Resin components

Claims (9)

An insert molded body comprising a resin member and a metal member, wherein the metal member has two or more joining holes formed by a joint surface with the resin member, and an opening portion of at least one of the joint holes has an area of 0.44 ² mm ² or more or less 19.63mm, the resin member has a convex portion is inserted into the engaging hole, the area of the peripheral surface of the bonding surface of the resin member and the metal member is surrounded by the S _1, engaged in the bonding surface side of the above-described When the sum of the areas of the openings of the holes is S ₂ , the ratio S ₂ /S ₁ satisfies the following inequality (I): 0.04 ≦ S ₂ / S ₁ ≦ 0.80 (I). The patentable scope of application of the insert molded item 1, wherein at least a portion of the area of the opening of the engaging holes is 0.64 mm ² or less than ² 3.14mm. The insert molded body according to claim 1 or 2, wherein the joint hole is formed to be distributed over the entire joint surface. The patentable scope of application of the two embedded or molded into 1, wherein the sum of the bonding area to the area of the area S _1, all of the engagement hole in a resin member and a metal member of a ratio S ₃ S ₃ / S _1, line The following inequality (II) is satisfied: 0.3 ≦ S ₃ / S ₁ ≦ 3 (II). The insert molded body according to claim 1 or 2, wherein the joint hole is a through hole penetrating the metal member. An insert molded body according to claim 1 or 2, wherein at least a part of said joint hole has a depth of a predetermined depth of said joint hole The cross-sectional area in the degree direction is smaller than the cross-sectional area in the depth direction at a position deeper than the predetermined depth. The insert molded body according to claim 1 or 2, wherein the metal member is made of aluminum die-casting. The insert molded body according to claim 1 or 2, wherein the resin member is made of a thermoplastic resin, and the glass transition temperature (Tg) of the thermoplastic resin is -0 ° C or more and Tg + 180 ° C or less. Annealing is performed. A heat dissipating structure comprising a heat source and an insert molded body according to claim 1 or 2, wherein the resin member is a heat receiving portion that receives heat from the heat source, and the metal member is a heat that heats the resin member. The heat dissipation portion of the heat dissipating portion has a thermal conductivity of 1 W/m. K above 20W/m. Below K, the thermal conductivity of the aforementioned metal member is 20 W/m. K above 300W/m. Below K.