JP2010030111A - Junction structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a junction structure which can join a nonmetallic member to a metallic member through a thermoplastic resin composition. <P>SOLUTION: The metallic member 2 such as an aluminum alloy is immersed in ammonia, hydrazine, and/or an aqueous solution amine compound to form the microunevenness on the surface. The thermoplastic resin composition containing PPS or PBT as a main component is injection-molded from a gate 10 to the surface so that a thermoplastic resin molding 4 is joined firmly. The nonmetallic member 3 such as a permanent magnet is fixed to the metallic member 2 by the thermoplastic resin molding 4 to obtain the junction structure 1. In the curing process of the thermoplastic resin structure, the nonmetallic member 3 is pressed to the metallic member 2 by the thermal contraction of resin to be joined more firmly. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a joint structure used for electronic equipment, home appliances, automobile parts, camera equipment, other structural parts, and the like. More specifically, the present invention relates to a joined structure in which a metallic member and a non-joinable member are integrated.

  The technology for integrating metal and resin is applied to automobiles, home appliances, electronic devices, other industrial parts, etc., and many joining technologies have been developed. Many of these are methods in which a resin is directly bonded to a metal by an adhesive. However, the adhesive has a problem that the adhesive strength decreases with time, the adhesive strength varies significantly depending on the surface condition, and the adhesiveness is unstable. On the other hand, it is also possible to join the two by injection molding a thermoplastic resin on the metal surface without using an adhesive. However, there is a large difference in physical properties such as linear expansion coefficient between metal and thermoplastic resin, and it is generally difficult to integrate the metal and thermoplastic resin with sufficient bonding strength.

  On the other hand, even if the thermoplastic resin is injection-molded on the surface of a non-metallic member such as glass, a permanent magnet or other magnetic material, tile, ceramics, stone, or wood, the two do not join firmly. Therefore, when trying to integrate such a non-metallic member that is not firmly bonded to the thermoplastic resin and the metallic member, even if the thermoplastic resin is simply injection molded between the two members, , Do not join firmly through the thermoplastic resin. Therefore, in order to join both members, a method is adopted in which a bolt hole common to both members is provided and integrated by tightening the bolt hole through the bolt hole (for example, Patent Document 1).

  In addition, a method for joining both members via a thermoplastic resin without providing such a bolt mechanism has been developed. When trying to integrate such a non-metallic member that is not firmly bonded to the thermoplastic resin and the metallic member, it is common to adopt a structure as shown in FIG. That is, a through hole 2b is provided in the metallic member 2, and the resin 4 is injection-molded on both surfaces of the plate-like metallic member 2 so as to penetrate the through hole 2b. The injection-molded resin 4 closes the through-hole 2b and forms a cover having a diameter larger than the diameter of the through-hole 2b. Therefore, it is difficult to pull out from the metallic member 2 after the resin 4 is cured. Further, as shown in the figure, the resin 4 covers the both ends of the nonmetallic member 3 in contact with the metallic member 2 so that the resin 4 sandwiches the metallic member 2 and the nonmetallic member 3. It becomes such an aspect. That is, the metallic member 2 and the nonmetallic member 3 are indirectly joined via the resin 4 to form the joined structure 1.

JP 2005-298771 A JP 2007-301972 A (magnesium alloy) WO-2004 / 041532 (Aluminum alloy) Japanese Patent No. 3954379 (aluminum alloy) Special table 2003-530808 gazette JP 2002-277221 A

  When the structure shown in FIG. 1 is adopted, since the injected resin 4 protrudes from the back side of the metallic member 2 (opposite side of the nonmetallic member 3), the resin 4 is injected into the metallic member. Although there is little fear of peeling off from 2, the process of forming the through-hole 2 b in the metallic member 2 is necessary, which hinders cost reduction and simplification of the manufacturing process. Furthermore, since the protrusion 4a of the resin 4 is generated on the back surface side of the metallic member 2, when it is necessary to attach another member to this back surface side, the protrusion of this resin will interfere, There is a limitation in the usage mode of the bonded structure 1. Furthermore, even if the design surface is taken into consideration, there is a restriction that the back surface cannot be smoothed. The same problem occurs even when both members are integrated with bolts, rivets or the like. Since this method involves machining, it requires man-hours, and there is a risk of loosening of bolts, which is unstable and lacks certainty. Moreover, if the member is small, such as an electronic component, it is difficult to process and assemble.

  The present invention has been made based on such a technical background, and has been conceived to solve the conventional problems, and achieves the following object. An object of the present invention is to firmly join a metallic member and a nonmetallic member by a simple method, and prevent the joined structure obtained thereby from interfering with other members, which is preferable in terms of design. There is to do. Furthermore, it is in contributing to the simplification and cost reduction of the manufacturing process of the joining structure.

The present invention takes the following means in order to achieve the object.
The joint structure according to the first aspect of the present invention is a joint structure of a metallic member and a nonmetallic member that is not firmly joined to the thermoplastic resin composition, and has fine irregularities formed by etching on the surface of the metallic member. And the thermoplastic resin molding is in contact with the non-metallic member so that the thermoplastic resin composition is injected only on a part of the surface of the metallic member. It is obtained by installing a mold so as to be fixed to a metallic member and performing injection molding. The metallic member and its thermoplastic resin molding are obtained by the penetration of the thermoplastic resin molding into the fine irregularities. It is characterized in that the objects are firmly joined.

  The joint structure according to the present invention 2 is the joint structure described in the present invention 1, and when the injection molding is performed, the temperature on the metallic member side is lower than that on the non-metallic member side. Thus, in order from the region close to the metallic member, the thermal contraction action of the thermoplastic resin composition is promoted, and the thermoplastic resin molded product generates pressure to push the nonmetallic member toward the metallic member. The non-metallic member and the metallic member are firmly joined by the pressure.

  The joint structure according to the present invention 3 is the joint structure according to the present invention 2, wherein the non-metallic member is fixed to the metallic member by covering the entire surface with the thermoplastic resin molding. It is characterized by being.

  The joint structure according to the present invention 4 is the joint structure described in the present invention 1, wherein the metallic member is an aluminum alloy, and the etching treatment is performed by using ammonia, hydrazine, and a water-soluble amine compound. A fiber filler and / or a powder type filler is added to the thermoplastic resin composition, and the aluminum alloy and the thermoplastic resin composition are added to the thermoplastic resin composition. The linear expansion coefficient is made close to each other.

  The joined structure according to the present invention 5 is the joined structure described in the present invention 1, wherein the nonmetallic member is selected from a magnetic material such as glass and a permanent magnet, tile, ceramics, stone, and wood. It is characterized by being 1 or more types.

  The joint structure according to the sixth aspect of the present invention is the joint structure according to the first aspect of the present invention, wherein the thermoplastic resin composition is mainly composed of one type selected from poniphenylene sulfide and polybutylene terephthalate. It is a resin.

  Hereinafter, the metallic member, the thermoplastic resin composition, and the nonmetallic member constituting the bonded structure of the present invention will be described.

[Metallic member]
The metallic members targeted in the present invention are mainly light alloys such as aluminum alloys, magnesium alloys, titanium alloys, copper alloys, steel materials, and stainless steels. Even if the thermoplastic resin composition is injection-molded without any treatment on the surface of these metallic members, a sufficient bonding force cannot often be obtained. In particular, it is insufficient when high reliability is required. Therefore, in the present invention, the surface of the metallic member is subjected to an etching process, thereby increasing the bonding force. The present inventors have developed an etching technique for integrating a metal alloy and a resin with a strong bonding force, and some of these techniques are disclosed. (Patent Documents 2 to 4).

[Example of aluminum alloy]
The outline will be described by taking an aluminum alloy as an example. A standardized aluminum alloy is used, but various processes are applied to the material in order to produce a product. Oils and fats and fine dust adhere to the surface of the processed shape. In particular, the machined surface is provided with a coolant liquid, chips and the like used during machining, and it is preferable to wash them. Specifically, it is removed by polishing or cleaning with an aluminum degreasing agent.

[Chemical etching]
Next, a chemical etching process is performed on the surface of the aluminum alloy. This is not an essential treatment in the present invention, but by performing this, the bonding between the aluminum alloy shaped article and the thermoplastic resin composition becomes more effective. Specifically, the aluminum alloy is immersed in a basic aqueous solution (pH> 7) and then washed with water. Examples of the base used in the basic aqueous solution include sodium hydroxide, potassium hydroxide, soda ash, and ammonia. By performing this treatment, the surface of the aluminum alloy is dissolved as aluminate ions while releasing hydrogen, and the surface of the aluminum alloy is shaved and etched to form a new surface.

[Chemical conversion treatment]
Next, a chemical conversion treatment is performed on the aluminum alloy surface subjected to chemical etching. This is an essential process in the present invention. Specifically, the aluminum alloy is immersed in an aqueous solution of ammonia, hydrazine and / or a water-soluble amine compound. By performing this treatment, the surface of the aluminum alloy is finely immersed to form fine irregularities, and the nitrogen-containing compound is adsorbed. A method in which a 3 to 10% hydrazine monohydrate aqueous solution is set to 40 ° C. to 70 ° C. and the aluminum alloy is immersed in the solution for several minutes and then washed with water is preferable. This is because it has no odor and is easy to handle.

[Thermoplastic resin]
Next, a crystalline thermoplastic resin composition is injection-molded on the surface of the aluminum alloy subjected to the chemical conversion treatment in this way. As the thermoplastic resin composition, one having as a main component poniphenylene sphere (hereinafter referred to as “PPS”) or polybutylene terephthalate (hereinafter referred to as “PBT”) is used. Further, the inclusion of the filler is very important from the viewpoint of improving the mechanical properties and making the linear expansion coefficients of the aluminum alloy shaped product and the thermoplastic resin composition coincide. As the fiber filler, one or more selected from glass fiber, carbon fiber, and aramid fiber may be used. As the powder filler, selected from calcium carbonate, magnesium carbonate, silica, talc, glass, and clay. One or more types may be used.

  About this PPS and PBT, it is described in the above-mentioned patent document and is well-known, and detailed description is abbreviate | omitted. According to the connector example, the PPS has the following characteristics. It is said that the time required for crystallization is, for example, ½ or less of the thermosetting epoxy resin, and it is not necessary to remove the molding burr remaining in the injection molding die and the productivity is good. Further, it is said that the change with time of the dimension is small in an environment of a humidity of 90% at a temperature of 60 to 80 degrees as compared with an epoxy resin. Therefore, even if PPS is applied to a structure, its dimensional accuracy is stable over the long term.

[Non-metallic member]
The non-metallic member that is an object to be joined is a member that cannot be directly joined to the metal body and is not firmly joined to the thermoplastic resin composition. The non-metallic member is a magnetic material such as glass or a permanent magnet, tile, ceramics, stone, or wood. That is, it is a member that is easy to break and difficult to process, and that is not suitable for injection molding.

  In the present invention, fine irregularities are formed on the surface of the metallic member by chemical conversion treatment. And a thermoplastic resin composition penetrate | invades into this fine unevenness | corrugation, and when it hardens | cures, a thermoplastic resin molded product and a metallic member are joined firmly. As a result, the nonmetallic member held by the thermoplastic resin molded product and the metallic member are firmly bonded. That is, since a sufficient bonding force can be obtained by injection molding the thermoplastic resin only on a part of the surface of the metallic member, the thermoplastic resin composition penetrates the metallic member as shown in FIG. There is no need to adopt a configuration. Further, it is not necessary to mechanically process the metallic member and the nonmetallic member, and it can be firmly joined by a simple method, which contributes to simplification of the manufacturing process and cost reduction. Moreover, as shown in FIG. 1, since the thermoplastic resin molding does not protrude on the back side of the metallic member, interference with other members is prevented, and the joint structure is versatile. can do. Furthermore, it can be preferable also in terms of design.

In addition, during injection joining, by setting the temperature on the metallic member side to be lower than that on the nonmetallic member side, the thermal contraction action of the thermoplastic resin composition is promoted sequentially from the region close to the metallic member. ing. Thereby, the thermoplastic resin molding produces a pressure that pushes the nonmetallic member toward the metallic member, and the nonmetallic member and the metallic member are firmly joined by the pressure.
Further, at this time, by adopting a configuration in which the entire surface of the nonmetallic member is covered with the thermoplastic resin molding, pressure is applied so as to suppress the entire nonmetallic member to the metallic member side. It can be set as the joined structure joined.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Although the metal body used as the object of this invention is a light alloy etc., it is not limited to this alloy. FIG. 2 shows the structure of an injection mold for injection molding a thermoplastic resin to the metallic member 2 and joining it to the nonmetallic member 3. The metallic member 2 is, for example, an aluminum alloy plate, and the surface 2a is subjected to the above-described chemical conversion treatment or the like, and has a fine uneven surface.

  On the other hand, the nonmetallic member 3 is installed in the cavity of the mold 20a in advance, and the thermoplastic resin composition is injected into the cavity from the gate 10a provided in the mold 20a (heat at that time). The flow of the plastic resin composition is indicated by A in FIG. 2). The thermoplastic resin composition injected into the mold in this way is crystallized and hardened while entering the fine irregularities of the surface 2a. By performing the above-described chemical conversion treatment, the surface 2a has an undercut shape, that is, a shape in which the diameter on the bottom surface side of the concave portion is larger than that of the concave portion entrance as shown in FIG. Therefore, due to the anchor effect, the thermoplastic resin molded product that has entered the fine irregularities cannot be easily pulled out from the fine irregularities.

  Here, the mold 20b is provided with a cooling pipe 21 through which cooling water flows. Therefore, the temperature on the metallic member 2 side is kept lower than the temperature of the nonmetallic member 3. As a result, the thermal contraction of the thermoplastic resin starts from a region close to the surface 2a of the metallic member 3, and gradually proceeds toward the gate 10a of the mold 20a. Therefore, the thermoplastic resin composition between the nonmetallic member 3 and the metallic member 2 is thermally contracted while gradually being brought closer to the metallic member 2 side, and curing proceeds.

  Due to the heat shrinkage of the curing process, a pressing force is generated in the direction indicated by the arrow B in FIG. 2 together with the curing of the thermoplastic resin composition in the holding portion that holds the nonmetallic member 3. As a result, when the thermoplastic resin composition is cured, the thermoplastic resin molding is firmly bonded to the surface 2a of the metallic member 2, and the nonmetallic member 3 is also firmly pressed against the metallic member 2 to be bonded. I will let you.

  Regarding the cooling of the mold, the cooling effect such as the curing time is evaluated according to the designed mold structure, the cooling capacity of the cooling circuit, and the like. In general, mold cooling achieves uniform and efficient cooling to obtain a high-quality resin product. However, in the case of the present invention, by keeping the metallic member at a temperature relatively lower than that of the nonmetallic member, the resin is cured from the resin near the surface of the metallic member faster, and the bonding force is obtained due to the shrinkage effect of the resin. It can be expected to grow. That is, it is preferable to cool only the metal mold on the metallic member side or to provide a temperature gradient so that the temperature is relatively lower than that of the metal mold on the non-metallic member side. PPS or the like is a resin having a small heat shrinkage ratio compared to a general thermoplastic resin composition, but since the resin is always accompanied by heat shrinkage, a pressing force is generated when the resin is injected and cured as described above. .

  In the example of FIG. 2, a through hole may be provided in the central portion of the metallic member 2, and a gate may be connected to this from the mold 20b side, and the thermoplastic resin composition may be injected into the through hole. . When such a configuration is adopted, the thermoplastic resin is injected into a cavity formed by the mold 20 a and the nonmetallic member 3.

  The bonded structure 1 thus obtained has a structure as shown in FIG. The thermoplastic resin molding 4 is firmly joined to the metallic member 2, and the nonmetallic member 3 is held by the thermoplastic resin molding 4 and pressed against the metallic member 2 side by the above-described thermal contraction. Yes. In this example, the contact area between the thermoplastic resin molding 4 and the metallic member 2 is large, and the bonding force between them is strong.

  Here, as shown in FIG. 4, when the entire surface of the nonmetallic member 3 is covered with the thermoplastic resin molding, the pressing force due to the thermal contraction as shown by the arrow C in FIG. The non-metallic member 3 is more strongly bonded to the metallic member 2.

  Thus, as a specific example of encapsulating a nonmetallic member with a thermoplastic resin composition, a resin body that serves as a blocking member for the permanent magnet is injection-molded in order to hold the permanent magnet that constitutes the stator of the electric motor. Is known (see, for example, Patent Document 5). There is also a similar example for a spindle motor (see, for example, Patent Document 6). The present invention can also be applied to these. Even in a region where there is little resin and metal, bonding is very strong, so even a small motor can be configured easily and at low cost. Furthermore, since the joining is based on the anchor effect, the joining force can be maintained over a long period of time.

  Another configuration example of the bonded structure will be described. In this example, the metallic member 2 is an aluminum alloy plate, and the nonmetallic member 3 is a permanent magnet. FIG. 5 is a cross-sectional view of the joined structure 1 showing an example in which the aluminum alloy plate 2 and the permanent magnet 3 are joined. In this example, the thermoplastic resin molding 4 is used as a fixing member, and the permanent magnet 3 is brought into direct contact with the surface of the aluminum alloy plate 2 to be joined. The thermoplastic resin molding 4 is bonded (fixed) to the surface of the aluminum alloy plate 2. The thermoplastic resin molding 4 is wrapped so as to embrace the outer periphery and upper surface of the permanent magnet 3, and is fixed and held. That is, the permanent magnet 2 is directly attached to the aluminum alloy plate 1, and its peripheral portion is held down and fixed by the thermoplastic resin molding 4. Thereby, although the permanent magnet 3 is not adhered or fixed to the surface of the aluminum alloy plate 2, it is fixedly disposed in direct contact.

  In the case of the embodiment shown in FIGS. 6, 7, and 8, the non-metallic member 3 is subjected to machining for engaging with the thermoplastic resin molding 4. These examples are configurations applied when the projection of the thermoplastic resin molded product 4 from the outer surface of the nonmetallic member 3 (surface opposite to the metallic member 2) is not allowed. In either case, the nonmetallic member 3 is fixed in direct contact with the metallic member 2.

  In FIG. 6, the inner wall portion of the nonmetallic member 3 has a stepped undercut shape, and the inside is cut out so that the nonmetallic member 3 has a C shape when viewed in a cross-sectional shape. A structure in which the thermoplastic resin composition is injected into the inner wall portion, and the nonmetallic member 3 is fixed to the metallic member 2 via the thermoplastic resin molding 4 in contact with the stepped inner wall and the metallic member 2 It has become.

  7 has the same configuration as that of FIG. 6, but the inner wall portion of the nonmetallic member 3 has a wedge-shaped undercut shape with a wide inside. The thermoplastic resin composition is injected into the wedge-shaped inner wall portion, and the non-metallic member 3 is made into the metallic member 2 through the thermoplastic resin molding 4 in contact with the wedge-shaped inner wall and the metallic member 2. It becomes the composition fixed to. The position of the gate 10 in the case of FIGS. 6 and 7 is limited to the metallic member 2 side. In this case, as shown in the figure, a through-hole is provided in the central portion of the metallic member 2 and injection molding is performed on the inner wall portion of the nonmetallic member 3 through the through-hole.

  In FIG. 8, a groove is provided on the side wall of the nonmetallic member 3, a thermoplastic resin composition is injected so as to connect the groove and the metallic member 2, and the thermoplastic resin molding 4 is engaged with the groove. This is an example configured as described above.

  FIGS. 9 and 10 are configurations that can be applied to the case where the intermediate portion of the nonmetallic member 3 can be processed. In FIG. 9, a through hole which is a plurality of cylindrical holes is provided in an intermediate portion of the nonmetallic member 3, a thermoplastic resin composition is injected into the through holes, and the thermoplastic resin molding 4 is made metallic. The non-metallic member 3 is fixed to the metallic member 2 by being joined to the member 2. The thermoplastic resin composition injected into the through hole presses the spotted portion 3a at the end of the through hole by thermal contraction, and presses and joins the nonmetallic member 3 to the metallic member 2. The contact portion between the thermoplastic resin molded product 4 and the metallic member 2 is firmly bonded on the principle described above.

  FIG. 10 is a modification example of FIG. 9, in which the inner diameter of the end portion of the through hole on the metallic member 2 side is increased, and the contact area between the thermoplastic resin molded product 4 and the metallic member 2 is increased. . In this example, the bonding force is stronger than in the case of FIG. The examples shown in FIGS. 9 and 10 do not have a structure in which the resin protrudes and joins around the nonmetallic member 3, so that the original shape (external contour) of the nonmetallic member 3 can be maintained and joined. There is.

  In FIG. 11, the peripheral edge of the nonmetallic member 3 is an inclined surface. That is, the peripheral part of the nonmetallic member 3 is formed in an acute inclined surface with respect to the surface of the metallic member 2, and the thermoplastic resin composition is injected onto the peripheral part. The nonmetallic member 3 is pressed and fixed in the direction of the metallic member 2 by the thermal contraction of the thermoplastic resin composition in contact with the inclined surface.

  FIG. 12 is a modified example of FIGS. 10 and 11, and has a configuration having the characteristics of FIGS. Each example of FIGS. 9, 10, and 12 is effective when the nonmetallic member 3 has a large area, and also has an effect of preventing the intermediate portion of the nonmetallic member 3 from floating.

  As mentioned above, although the various structural examples were demonstrated, in any case, it joins with a thermoplastic resin molding firmly only in the partial area | region of the one side surface of a plate-shaped metallic member. According to the present invention, it is possible to easily obtain a strong bonded structure simply by performing injection molding of a resin after positioning and setting a nonmetallic member in a mold. That is, it is not necessary to perform complicated mechanical processing on the metallic member and the nonmetallic member, which contributes to simplification of the manufacturing process and cost reduction. It goes without saying that the present invention is not limited to this embodiment.

FIG. 1 is a cross-sectional view showing a holding form of a non-metallic member by injection molding to a metallic member in the prior art. FIG. 2 is a cross-sectional view of the mold configuration showing the thermal shrinkage of the thermoplastic resin composition. FIG. 3 is a cross-sectional view of a bonded structure obtained by the mold configuration of FIG. FIG. 4 is a cross-sectional view of a joined structure in which the entire surface of a nonmetallic member is covered with a thermoplastic resin composition. FIG. 5 is a cross-sectional view of a joined structure in which a permanent magnet is brought into direct contact with the surface of an aluminum alloy plate and joined using a thermoplastic resin molding as a fixing member. FIG. 6 is a cross-sectional view of a bonded structure obtained by providing a non-metallic member with a stepped inner wall and injection molding resin in this range. FIG. 7 is a cross-sectional view of a joint structure obtained by providing a wedge-shaped inner wall portion on a non-metallic member and injection molding a resin in this range. FIG. 8 is a cross-sectional view of a joined structure obtained by providing a groove on the side wall of a nonmetallic member and injection molding a resin so as to connect the groove to the metallic member. FIG. 9 is a cross-sectional view of a joined structure obtained by providing a through-hole in the middle part of a non-metallic member and injection-molding a resin in a region partitioned by the metallic member. FIG. 10 is a modified example of the joint structure shown in FIG. 9, and is a cross-sectional view when the diameter of the through hole of the nonmetallic member is increased on the metallic member side. FIG. 11 is a cross-sectional view of a bonded structure obtained by performing processing with the peripheral edge of a nonmetallic member as an inclined surface and injection molding a resin so as to connect the inclined surface and the metallic member. FIG. 12 is a cross-sectional view of a joined structure obtained by providing a through hole in an intermediate part of a nonmetallic member in addition to the structure shown in FIG. 11 and injection-molding a resin in an area partitioned by the metallic member. It is.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Joining structure 2 ... Metallic member 3 ... Nonmetallic member 4 ... Thermoplastic resin molding 10 ... Gate 20 ... Mold 21 ... Cooling pipe

Claims (6)

A joined structure of a metallic member and a nonmetallic member that does not firmly join the thermoplastic resin composition,
Forming fine irregularities by etching on the surface of the metallic member;
The thermoplastic resin composition is injected only on a part of the surface of the metallic member, and the molded thermoplastic resin is in contact with the nonmetallic member, and the nonmetallic member is used as the metallic member. Obtained by installing a mold to fix and performing injection molding,
A joining structure characterized in that the metallic member and the thermoplastic resin molding are firmly joined by the penetration of the thermoplastic resin molding into the fine irregularities. A joined structure according to claim 1,
When performing the injection molding, by making the temperature on the metallic member side lower than that on the nonmetallic member side, the heat shrinking action of the thermoplastic resin composition sequentially from the region close to the metallic member. The thermoplastic resin molding causes pressure to push the nonmetallic member toward the metallic member,
The non-metallic member and the metallic member are firmly joined by the pressure. A joining structure according to claim 2,
The non-metallic member is fixed to the metallic member by covering the entire surface with the thermoplastic resin molding. A joined structure according to claim 1,
The metallic member is an aluminum alloy,
The etching treatment is a treatment of immersing the aluminum alloy in one or more aqueous solutions selected from ammonia, hydrazine and a water-soluble amine compound,
The thermoplastic resin composition contains a fiber filler and / or a powder-type filler, and has a linear expansion coefficient close to that of the aluminum alloy and the thermoplastic resin composition. A joined structure according to claim 1,
The non-metallic member is at least one selected from glass, magnetic material, tile, ceramics, stone, and wood. A joined structure according to claim 1,
The said thermoplastic resin composition is resin which has as a main component 1 type selected from the ponyphenylene sphere and polybutylene terephthalate, The joining structure characterized by the above-mentioned.

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