JP2011240685A - Seal structure for metallic composite joint body and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent leakage of gas and liquid and secure high airtightness and liquid-tightness between a metallic material and a different type material such as a synthetic resin material in a seal structure of a metallic composite joint body and a method of manufacturing the same.SOLUTION: In a range of a joint interfacial boundary 4 in which a metallic member 2 comes into contact with a different type member 3, 10 to 100 airtightness holding grooves 5 having 5 μm to 15 μm of depth are formed at 100 μm of pitches. The metallic member 2 is set within an injection molding die so as to perform injection molding of the different type member 3. Thus, the different type member 3 in the molten state is made to enter the airtightness holding grooves 5 and the metallic member 2 and the different type member 3 are jointed to each other without clearances, so as to obtain the metallic composite joint body 1 and secure the airtightness on the joint interfacial boundary 4.

Description

  The present invention relates to a sealing structure of a metal composite joined body of a metal material having high airtightness and liquid tightness and a dissimilar material such as a nonmetallic synthetic resin material and a manufacturing method thereof, The present invention relates to a seal structure of a metal composite joined body that has been air-tightened by surface treatment and a method for producing the same.

In recent years, portable electronic devices represented by mobile phones, notebook computers, electronic notebooks, video cameras, etc. have been widely used, and the housing of these electronic devices has intruded moisture and rainwater. Airtightness and liquid tightness are required to prevent this.
Also, vehicles such as automobiles are equipped with a large number of electronic control units (ECU) such as engine control system, steering system, drive system, air conditioning system, various sensors, actuators, etc. Airtightness and liquid tightness are similarly required for the casings of these on-vehicle electronic devices.

With regard to such portable electronic equipment and in-vehicle electronic equipment housings, there are demands for downsizing, weight reduction, cost reduction, freedom of shape design, etc. Recently, light metals such as aluminum alloys have been used as the material of the housing in response to the demand for further thinning of the housing.
Here, in order to install a synthetic resin member such as a holding member for fixing an electronic board or the like housed in the housing to the housing, a screw boss, etc., between the metal housing and the synthetic resin component A joining method having high air tightness and liquid tightness has been required.

Therefore, in Patent Document 1, for the purpose of obtaining a strong metal composite assembly of an aluminum alloy and a synthetic resin, the surface roughness of the aluminum alloy is 1 μm to 10 μm, and 0.03 μm to 0.1 μm per 1 μm square. There are 10 to 50 first concave portions having a diameter, 50 to 500 second concave portions having a diameter of 0.01 to 0.03 μm, and the surface is covered with an aluminum oxide compound layer having a thickness of 1 to 2 μm. An invention of a composite of an aluminum alloy and a resin composition that is cured and firmly bonded in a state where the resin composition has penetrated to the first recess and the second recess is disclosed.
However, in the technique described in Patent Document 1, it is necessary to perform fine etching with an aqueous monohydric hydrazine solution adjusted to pH 10.0 to pH 11.5 after alkaline etching of the aluminum alloy, resulting in poor productivity. In addition to high costs, there is a problem that a waste liquid treatment process is essential because of the use of harmful hydrazine.

  In addition, Patent Document 2 aims to join a metal material and a dissimilar material such as a synthetic resin material with extremely high adhesiveness by using a laser processing technique that has few processing steps, is easy to automate, and has high productivity. The invention discloses a laser processing method for a metal surface that includes a step of laser scanning a metal surface in a certain scanning direction and a step of laser scanning the metal surface in another scanning direction that intersects the scanning direction. Yes.

Japanese Patent No. 4292514 Japanese Patent No. 4020957

  However, in the technique described in Patent Document 2, it has been clarified that the bonding peel strength is improved, but no consideration is given to the airtightness between the metal material and the dissimilar material made of a synthetic resin material made of nonmetal. However, there is a problem that it is not possible to obtain a seal structure of a metal composite joined body that ensures airtightness between a metal material and a different material such as a synthetic resin material.

  Therefore, the present invention has been made to solve such a problem, and it is very difficult to leak gas and liquid at the joint interface between a metal material and a dissimilar material having different physical properties from the metal material. It is an object of the present invention to provide a seal structure of a metal composite joined body capable of ensuring airtightness and liquid tightness and a method for producing the same.

  The seal structure of the metal composite joined body according to the invention of claim 1 includes the metal member of the metal composite and the dissimilar metal member of the metal composite joined body joined with the dissimilar member of a dissimilar material having different physical properties from the metal material. An airtight holding groove that circulates around the surface of the metal member along a direction intersecting a direction that requires airtightness of the joint interface at the joint interface with the member requires airtightness of the joint interface. A plurality of them are formed in the direction to be sealed, and the metal member and the dissimilar member are melt-bonded to ensure airtightness.

Here, examples of the metal material include aluminum, aluminum alloy, magnesium, magnesium alloy, iron, steel, stainless steel, copper, copper alloy, beryllium, beryllium alloy, nickel, nickel alloy, titanium, and titanium alloy.
In addition, non-metallic materials such as synthetic resins, natural rubber and elastomers containing synthetic rubber, and metallic materials are the same as the different materials, but the same kind as the metallic material used for the metal member, but physical properties such as viscosity at the time of melting. There are metal materials that are different in type and metal materials that are different from the metal materials used for the metal members.
Further, the direction intersecting with the direction requiring airtightness of the joint interface is preferably a right angle direction, but is not limited to the right angle direction. It is only necessary to have an angle, and it may be in the range of 45 degrees to 90 degrees. The directions that require airtightness at the joint interface are the space where gas and liquid can be allowed (outside the airtight structure) and the space where gas and liquid cannot be allowed (inside the airtight structure). It means that the inside and outside directions of the airtight structure at the joint interface.

In the seal structure of the metal composite joined body according to the invention of claim 2, the dissimilar material is a synthetic resin material, and the dissimilar member is melt-bonded to the metal member by injection molding.
Here, the synthetic resin material for carrying out the present invention includes a thermoplastic resin and a thermosetting resin. The thermoplastic resin further includes a general-purpose resin, an engineering plastic (hereinafter also referred to as “engineer plastic”), a super resin.・ There are engineering plastics (hereinafter also referred to as “super engineering plastics”). The dissimilar material may be a part or the whole of a part.

In the seal structure of the metal composite joined body according to the invention of claim 3, the formation of the airtight holding groove is laser processing.
Here, as a laser oscillator for performing laser machining method, YAG (Nd: YAG) laser, YVO4 (Nd: YVO ₄₎ laser, CO ₂ laser, excimer laser, argon laser or the like.

  The seal structure of the metal composite joined body according to the invention of claim 4 is characterized in that the airtight holding groove has a depth in the range of 2 μm to 30 μm, more preferably 5 μm to 20 μm, and the interval between the airtight holding grooves. Is a pitch within a range of 20 μm to 200 μm, more preferably within a range of 50 μm to 1500 μm.

  According to a fifth aspect of the present invention, there is provided a method of manufacturing a seal structure for a metal composite joined body, wherein a metal member of a metal material and a dissimilar member of different materials having different physical properties are joined, and the metal material and the dissimilar material A metal composite joined body seal structure manufacturing method having a joint boundary surface opposite to the metal member, wherein the surface of the metal member makes a round along a direction intersecting a direction that requires airtightness of the joint boundary surface. A plurality of airtight holding grooves are formed in a direction that requires airtightness of the joint boundary surface, and the metal member and the dissimilar member are melt-bonded to give the joint boundary surface airtightness. is there.

  In the method for manufacturing a seal structure of a metal composite joined body according to the invention of claim 6, the dissimilar material is a synthetic resin material, and the joining step is an injection molding step of the synthetic resin material.

  The airtight holding groove forming step of the manufacturing method of the seal structure of the metal composite joined body according to the invention of claim 7 is a laser processing step of the metal material.

  The airtight holding groove of the method for producing a seal structure for a metal composite joined body according to the invention of claim 8 has the predetermined pitch in the range of 20 μm to 200 μm, more preferably in the range of 50 μm to 150 μm. The depth is in the range of 2 μm to 30 μm, more preferably in the range of 5 μm to 20 μm.

  The seal structure of the metal composite joined body according to the invention of claim 1 includes: a metal member of a metal material; and a dissimilar member of a dissimilar material having physical properties different from that of the metal material. It is the seal structure in the joining interface surface which opposes. The structure refers to an airtight holding groove that goes around the surface of the metal member along a direction intersecting a direction that requires airtightness of the joint interface in a direction that requires airtightness of the joint interface. After the formation, a structure in which the different members are melt-bonded is formed.

In this way, an airtight holding groove is formed around the surface of the metal member along a direction intersecting with the direction that requires airtightness of the joint boundary surface, and the dissimilar member is melted and inserted into the airtight holding groove. Therefore, it is possible to prevent a fluid such as a gas or a liquid from flowing in a direction that requires the airtightness of the joint interface. Furthermore, since a plurality of airtight holding grooves are formed in a direction that requires airtightness, the flow of fluid can be more reliably prevented and airtightness can be ensured.
In particular, the surface formed when the metal material and the dissimilar material are assembled is a surface where irregularities continue along the direction that requires airtightness of the joint boundary surface, and since the joint area is widened, the airtight holding groove is formed. Compared with those not formed, a path through which gas and liquid enter at the joint interface is not formed, so that the gas and liquid hardly flow and the airtightness and liquid tightness are greatly improved.

  In this way, by cutting the path for the flow of gas and liquid at the joint interface, fluid such as gas and liquid does not flow very much, and high airtightness between metal material and dissimilar material such as synthetic resin material. It becomes a metal composite joined body which can ensure property and liquid-tightness.

  In the seal structure of the metal composite joined body according to the invention of claim 2, since the dissimilar material is a synthetic resin material and the joining of the dissimilar member is injection molding of the synthetic resin material, the effect of the invention according to claim 1 In addition, since the synthetic resin material easily enters the airtight holding groove by the synthetic resin material having high fluidity, the airtightness of the joint boundary surface can be secured more easily.

  In the seal structure of the metal composite joined body according to the invention of claim 3, since the formation of the airtight holding groove is laser processing, in addition to the effect of the invention of claim 1 or claim 2, Less automation, higher productivity, and mass production of metal composite joints at lower cost.

  The airtight holding groove in the seal structure of the metal composite joined body according to the invention of claim 4 has a predetermined pitch in the range of 20 μm to 200 μm and a predetermined depth in the range of 2 μm to 30 μm. In addition to the effects of the inventions according to Items 1 to 3, it is possible to obtain better airtightness at a low cost.

  The inventor has conducted extensive experimental research on the pitch and depth of the airtight holding grooves capable of obtaining better airtightness. As a result, the predetermined pitch is set within a range of 20 μm to 200 μm, and the predetermined depth is set to 2 μm. It has been found that by setting the thickness within the range of ˜30 μm, better airtightness can be obtained at the joint interface between the metal material and the different material.

That is, if the predetermined pitch of the airtight holding grooves is less than 20 μm, it becomes difficult to form the airtight holding grooves, resulting in high cost. On the other hand, if the predetermined pitch of the airtight holding grooves exceeds 200 μm, the pitch is too large and the airtightness is increased. It is difficult to obtain excellent airtightness due to the limited number of the retaining grooves.
In addition, if the predetermined depth of the airtight holding groove is less than 2 μm, the depth is too small, and there is a possibility that a gap is generated at the joint boundary surface depending on the joint state with the dissimilar member, so that excellent airtightness can be obtained. It becomes difficult. On the other hand, if the predetermined depth of the airtight holding groove exceeds 30 μm, it becomes difficult to form the airtight holding groove and the cost is increased.
Therefore, the pitch of the airtight holding grooves is preferably in the range of 20 μm to 200 μm and the depth is preferably in the range of 2 μm to 30 μm.

  In addition, since the predetermined pitch is in the range of 50 μm to 150 μm and the predetermined depth is in the range of 5 μm to 20 μm, it is more preferable because excellent airtightness can be obtained more reliably and at low cost.

In the manufacturing method of the seal structure of the metal composite joined body according to the invention of claim 5, first, in the airtight holding groove forming step, the airtightness of the joint interface is formed on the surface of the metal material at the joint interface between the metal material and the different material. A predetermined number of annular airtight holding grooves are formed at a predetermined pitch along a direction intersecting the direction that requires the property, and then a different material is formed on the surface of the metal material on which the airtight holding grooves are formed in the joining process. Be joined.
As a result, the joint surface between the metal material and the dissimilar material becomes a surface where irregularities continue along the direction that requires airtightness of the joint boundary surface, and the joint boundary surface compared to before the airtight holding groove is formed. Since the path through which the gas and liquid intrude significantly increases, the air tightness and liquid tightness are greatly improved.

  In this way, by closing the path for the gas and liquid to enter at the joint interface, the gas and liquid are very difficult to flow, and the high airtightness between the metal material and the dissimilar material such as the synthetic resin material and Liquid tightness can be secured.

  In the manufacturing method of the seal structure of the metal composite joined body according to the invention of claim 6, the dissimilar material is a synthetic resin material, and the joining process is an injection molding process of the synthetic resin material. In addition to the effects of the above, the synthetic resin material enters the airtight holding groove due to the characteristics of the synthetic resin material with high fluidity, and the metal material and the dissimilar material are more closely joined together, and are joined by injection molding. Therefore, the metal composite can be mass-produced.

  In the manufacturing method of the seal structure of the metal composite joined body according to the invention of claim 7, since the airtight holding groove forming step is a laser processing step of the metal material, the effect of the invention according to claim 5 or claim 6 is achieved. In addition, the manufacturing method of the seal structure of the metal composite joined body that has few processing steps, is easy to automate, and has high productivity can be mass-produced at a lower cost.

  In the manufacturing method of the metal composite joined body seal structure according to the invention of claim 8, the airtight holding grooves have a predetermined pitch in the range of 20 μm to 200 μm and a predetermined depth in the range of 2 μm to 30 μm. Therefore, in addition to the effects of the inventions according to claims 5 to 7, it is a method for producing a seal structure of a metal composite joined body that can obtain better airtightness at low cost.

  The inventor has conducted extensive experimental research on the pitch and depth of the airtight holding grooves capable of obtaining better airtightness. As a result, the predetermined pitch is set within a range of 20 μm to 200 μm, and the predetermined depth is set to 2 μm. It has been found that by setting the thickness within the range of ˜30 μm, better airtightness can be obtained at the joint interface between the metal material and the different material.

That is, if the predetermined pitch of the airtight holding grooves is less than 20 μm, it becomes difficult to form the airtight holding grooves, resulting in high cost. On the other hand, if the predetermined pitch of the airtight holding grooves exceeds 200 μm, the pitch is too large and excellent. It becomes difficult to obtain the airtightness.
Further, if the predetermined depth of the airtight holding groove is less than 2 μm, it is difficult to obtain excellent airtightness because the depth is too small, while if the predetermined depth of the airtight holding groove exceeds 30 μm, the airtightness The formation of the holding groove becomes difficult and the cost is increased.
Therefore, the pitch of the airtight holding grooves is preferably in the range of 20 μm to 200 μm and the depth is preferably in the range of 2 μm to 30 μm.

  In addition, since the predetermined pitch is in the range of 50 μm to 150 μm and the predetermined depth is in the range of 5 μm to 20 μm, it is more preferable because excellent airtightness can be obtained more reliably and at low cost.

FIG. 1A is a schematic perspective view of a sample showing a sealing structure of a metal composite joined body according to Example 1 of the present invention divided into a metal material and a different material, and FIG. 1B is an internal structure of the metal composite. FIG. FIG. 2 is a flowchart showing a method for manufacturing a seal structure of a metal composite joined body according to Embodiment 1 of the present invention. FIG. 3A shows measurement data indicating the surface roughness before laser processing of the metal material constituting the seal structure of the metal composite joined body according to Example 1 of the present invention, and FIG. 3B shows the surface roughness after laser processing. It is the measurement data which shows. FIG. 4 is a schematic view showing a method of an airtightness test of a seal structure of a metal composite joined body according to Example 1 of the present invention. FIG. 5A is a longitudinal sectional view showing a seal structure of a metal composite joined body according to Embodiment 2 of the present invention, and FIG. 5B is a longitudinal sectional view showing a seal structure of a metal composite joined body according to Embodiment 3 of the present invention. FIG. 6A is a longitudinal sectional view showing a seal structure of a metal composite joined body according to Example 4 of the present invention, and FIG. 6B is a longitudinal sectional view showing a seal structure of a metal composite joined body according to Example 5 of the present invention. FIG. 6C is a longitudinal sectional view showing a seal structure of a metal composite joined body according to Example 6 of the present invention.

  In order to carry out the sealing structure of the metal composite joined body and the manufacturing method thereof according to the present invention, a metal material, a dissimilar material such as a synthetic resin, and a method of forming an airtight holding groove on the surface of the metal material are required. It becomes.

  Here, aluminum, aluminum alloy, magnesium, magnesium alloy, iron, steel, stainless steel, copper, copper alloy, beryllium, beryllium alloy, nickel, nickel alloy, titanium, titanium alloy, etc. can be used as the metal material. For light-weight applications, light metals such as aluminum, magnesium, beryllium, titanium, and alloys thereof are preferable.

In addition, examples of the different materials include synthetic resins, natural rubber, and elastomers including synthetic rubber, but synthetic resin materials are preferable from the viewpoint of moldability, cost, and lightness.
As the synthetic resin material, thermoplastic resins such as general-purpose resins, engineering plastics, and super engineering plastics, and thermosetting resins can be used.

General-purpose resins include polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polyvinylidene chloride, polystyrene, polyvinyl acetate, acrylic resin, ABS resin, AS resin, and the like.
Engineering plastics include polyamide (such as nylon), polyacetal, polycarbonate, modified polyphenylene ether, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), glass fiber reinforced polyethylene terephthalate, and cyclic polyolefin.
Super engineering plastics include polyphenylene sulfide (PPS), polytetrafluoroethylene (PTFE), polysulfone, polyether sulfone, amorphous polyarate, liquid crystal polymer, polyether ether ketone (PEEK), thermoplastic polyimide, polyamideimide, and the like. .
Examples of the thermosetting resin include phenol resin, epoxy resin, melamine resin, urea resin, unsaturated polyester resin, alkyd resin, polyurethane, and thermosetting polyimide.

Further, as a method of forming the airtight holding groove, there are laser processing, electric discharge processing, cutting processing such as milling and the like, but laser processing (laser surface treatment) is preferable from the viewpoint of processing efficiency and design freedom.
Laser light oscillators used for laser processing include YAG (Nd: YAG) laser, YVO4 (Nd: YVO ₄ ) laser, CO ₂ laser, excimer laser, argon laser, etc., which process metal materials. Therefore, it is preferable to use a YVO4 laser with a wavelength of 1.064 μm, a YAG laser with a wavelength of 1.064 μm, a CO ₂ laser with a wavelength of 10.6 μm, or the like.

  Hereinafter, examples using a sample will be described with reference to the drawings with regard to the specific structure of the sealing structure of the metal composite joined body and the manufacturing method thereof according to the present invention.

[Example 1]
First, Embodiment 1 of the metal composite joined body sealing structure and the manufacturing method thereof according to the present invention will be described with reference to FIGS.

First, the structure of the seal structure of the metal composite joined body according to the first embodiment will be described with reference to FIG.
As shown in FIG. 1A and FIG. 1B, a sample of the metal composite joined body 1 according to the first embodiment includes an aluminum alloy 2 a as the metal member 2 and a synthetic resin material 3 a as the dissimilar member 3. It is a complex consisting of In Example 1, an aluminum alloy 2a is used as the metal member 2, and specifically, the synthetic resin material 3a is a super engineering plastic having a melting point of 280 ° C. (hereinafter also abbreviated as “PPS”). Using.

As shown in FIG. 1A, the aluminum alloy material 2a as the metal member 2 was a rectangular parallelepiped sample having a length of 35 mm, a width of 15 mm, and a thickness of 3 mm. In the joint boundary surface 4 with the dissimilar member 3 made of PPS (polyphenylene sulfide) material as a synthetic resin material, it makes one round along the direction S perpendicular to the direction L that requires airtightness of the joint boundary surface 4. A plurality of airtight holding grooves 5 are formed in the direction L that requires airtightness.
As shown in FIG. 1 (b), the dissimilar member 3 made of the PPS material of the aluminum alloy material 2a is melt-bonded (in the first embodiment, the metal member 2 is inserted and integrated with the dissimilar member 3 by injection molding. ), The metal composite joined body 1 according to the first embodiment is configured.

The sample of this example is determined as a part of the housing (housing) of the electronic device. However, when the present invention is implemented, the sample is not limited to the form of the sample of this example. In addition, the present invention is not limited to the housing of the electronic device, and may be a connector, a component such as an opening / closing lid, or a printed board.
The seal structure of the metal composite joined body of the present invention is effective for joining the joining boundary surface 4 between the joined metal member 2 and the dissimilar member 3.

  Next, the manufacturing method of the seal structure of the metal composite joined body according to the first embodiment will be described with reference to the manufacturing flowchart of FIG.

As shown in FIG. 2, first, a cutting process is performed in which the aluminum alloy 2a as the metal member 2 is cut into the aluminum alloy material 2a having the shape and size shown in FIG. Next, the cutting oil or the like adhering to the surface is washed (step S2) and dried (step S3).
Subsequently, a laser processing step is performed in which surface processing is performed by laser processing that makes one round continuously around the entire circumference of the four surfaces of a rectangular parallelepiped sample having a length of 35 mm, a width of 15 mm, and a thickness of 3 mm (step S4). The laser processing step in step S4 corresponds to an airtight holding groove forming step.
In addition, although it is preferable that the surface treatment by the laser processing of the four surfaces of the sample makes one round continuously, a part may be cut off. However, it is necessary to prevent the cut of the airtight holding groove 5 from being straight with respect to the direction that requires airtightness. Moreover, it is not preferable to use a spiral shape.
As a precaution, the aluminum alloy material 2a of the present embodiment is held by a chuck so as to rotate along the central axis in the direction L where airtightness is required. The laser is continuously irradiated every round to form 50 times of the airtight holding grooves 5 in total, and 50 airtight holding grooves 5 having a pitch of 100 μm and a depth of 10 μm are formed.

That is, in the range of the joint boundary surface 4 where the aluminum alloy material 2a is opposed to the synthetic resin material 3a made of PPS material, laser scanning is performed 50 times for each surface, and the depth is 5 μm to 15 μm at a pitch of 100 μm. The 50 airtight holding grooves 5 are formed. In addition, 50 laser scans performed on four surfaces result in 50 annular airtight holding grooves 5.
In the preparation of the sample of this example, as a laser beam oscillation device, a YVO4 laser / MD-V9900A type (wavelength 1.064 μm / output 13 W) manufactured by Keyence was used, laser power 80%, scan speed 80 mm / s. The four-side processing time was 36.2 seconds.

The surface state of the aluminum alloy material 2a before and after the laser processing step will be described with reference to FIG.
FIG. 3A is data showing the surface roughness of the aluminum alloy material 2a before laser processing. It can be seen that the aluminum alloy material 2a before laser processing has a very smooth surface. On the other hand, as is apparent from FIG. 3B showing the surface roughness of the aluminum alloy material 2a after laser processing, the airtight holding groove 5 having a depth of 15 μm to 20 μm is formed by laser processing. . In the case of laser processing, the metal of the cut groove has a maximum change of +20 μm on the upper surface of the sample, and is piled on the cut surface as if the material of the airtight holding groove 5 was sprayed. I understand that. Therefore, since the depth of the airtight holding groove 5 is substantially increased, when the metal member 2 is integrally formed by injection molding with the dissimilar member 3, the surface area is large, so that the bonding property is good. It was.

  Further, in FIG. 2, an aluminum alloy material 2a as a metal member 2 laser-processed in the joining process is set in an injection mold, and a synthetic resin material 3a is injected to form a heterogeneous member 3 including an opening 3b. (Step S5). By this injection molding, the aluminum alloy material 2a is joined to the opening 3b of the synthetic resin material 3a, and perpendicularly intersects the airtight holding groove 5 in a direction in which airtightness and liquid tightness are required (that is, the continuous airtight holding groove 5). The joining surface along the direction) becomes a continuous surface with fine irregularities, and the joining boundary surface 4 of the metal composite joined body 1 according to the first embodiment is obtained.

Thus, airtightness becomes favorable by making the joining boundary surface 4 into a plurality of irregularities that continuously make a round in the direction L where airtightness is required. The reason is described below.
When one airtight holding groove 5 is formed in the metal member 2, a total of three surfaces, that is, a vertical surface and a bottom surface, which are the depth direction of the airtight holding groove 5, are the joint boundary surface 4 with the dissimilar member 3. As a new boundary surface, it is added in the direction where airtightness is required. The two surfaces of the upright surfaces are different in direction from the surface of the metal member 2 forming the bottom surface and the airtight holding surface 5. A plurality of airtight holding grooves 5 are formed in the direction L where airtightness is required. Therefore, six or more new boundary surfaces, of which four or more elevation surfaces having different directions from the surface of the metal member 2 are newly formed on the bonding boundary surface 4. In this way, by providing a large number of joint surfaces between the metal member 2 and the dissimilar member 3, even if the adhesion of one of the joint surfaces deteriorates and fluid intrusion occurs, many other airtight holding grooves are formed. The boundary surface formed by 5 prevents the intrusion of the fluid, and airtightness can be ensured. In particular, in the present invention, the direction L of the joint boundary surface 4 is different from the direction of the vertical surface and the surface direction of the bottom surface and the metal member 2. In other words, it is a continuous uneven surface. By repeatedly changing the direction of the bonding boundary surface 4 in this way, even if there is a cause of deteriorating the adhesion of the bonding boundary surface 4 in one direction, the adhesion of the bonding boundary surface 4 in the other direction can be maintained. As a result, the airtightness can be secured. In addition, it is also useful for securing airtightness that the joining area is increased and the joining force is improved by making the joining boundary surface 4 uneven in the direction L in which airtightness is required.

  In particular, in the case of laser processing, the cut metal of the airtight holding groove 5 appears as a change in the thickness direction, and is deposited on the cut surface as if the material of the airtight holding groove 5 is sprayed. Therefore, the depth of the airtight holding groove 5 is substantially increased, the area to be joined is increased, and the joining boundary surface 4 between the metal member 2 and the dissimilar member 3 is joined, so that the fluid Therefore, better sealing performance can be obtained. The airtightness of the metal composite joined body 1 was tested using an airtightness test apparatus 10 as shown in FIG.

That is, the metal composite joined body 1 is set in the upper opening 12 of the airtight container body 11, the pressing plate 13 is placed thereon, and the packing 14 and the O-ring 15 are set under the metal composite joined body 1. The bolt 16 was tightened. Then, the presence or absence of air leakage from between the metal member 2 and the dissimilar member 3 of the metal composite joined body 1 was confirmed by injecting compressed air from the lower opening 17.
As a result, even when 0.5 MPa of compressed air was injected for 30 seconds, there was no air leakage, and the metal member 2 and the dissimilar member 3 of the metal composite joined body 1 maintained extremely high airtightness and liquid tightness. It is clear that they are joined.

  Thus, in the metal composite joined body seal structure and the manufacturing method thereof according to the first embodiment, the joint interface 4 has higher airtightness compared to before the airtight holding groove 5 is formed. And a predetermined number of annular airtight properties at a predetermined pitch around the entire surface of the metal member 2 along a direction intersecting a direction that requires airtightness of the joint interface 4 between the metal member 2 and the dissimilar member 3. Since the holding grooves 5 are formed and the number of combinations with the airtight holding grooves 5 is increased, even if the adhesion for one minute cannot be maintained, the airtightness holding in the direction that requires airtightness is maintained. Since a plurality of grooves 5 are provided, a plurality of airtight holding grooves 5 are formed in stages, and high airtightness and liquid tightness of the joining interface 4 can be ensured.

[Example 2]
Next, the seal structure of the metal composite joined body according to Example 2 of the present invention will be described with reference to FIG. As shown in FIG. 5 (a), the metal composite joined body 1A according to Example 2 includes two flat plate-like members 3A made of a flat polyphenylene sulfide (PPS) material as a synthetic resin material. The aluminum member 2a as the metal member 2A is penetrated.
Then, on the four surfaces of the two flat aluminum alloy materials 2a, an airtight holding groove 5A is continuously formed in an annular shape around each by laser processing.
As shown in FIG. 5 (a), a metal member 2A made of an aluminum alloy material 2a is joined integrally with a dissimilar member 3A made of a PPS material to be injection-molded, whereby a metal composite joint according to the second embodiment. A body 1A is constructed.

  That is, the airtightness of the joining boundary surface 4A is required in the range of the joining boundary surface 4A, which is a portion where the metal member 2A made of an aluminum alloy material is set in the injection mold and contacts the dissimilar member 3A made of the PPS material. A laser scan is performed along a direction intersecting the direction to form an airtight holding groove 5A having a depth of 5 μm to 15 μm at a pitch of 100 μm.

Next, a joining step is performed in which the metal member 2A made of a laser-processed aluminum alloy material is set in an injection mold, the PPS material is ejected, and the member is molded integrally with the dissimilar member 3A.
Thus, the airtight holding groove 5A that goes around the surface at the joint boundary surface of the metal member 2A along the direction that requires airtightness between the metal member 2A and the dissimilar member 3A is predetermined in the direction that requires airtightness. A plurality of pitches are formed. Since the number of the airtight holding grooves 5A is increased in this way, even if a small amount of gas or liquid enters, the remaining airtight holding grooves 5A and the like are in a direction that requires airtightness. Since shielding is performed, the metal composite joined body 1A according to the second embodiment that can ensure the airtightness of the joining interface 4A is obtained.

  Thus, in the metal composite joined body seal structure and the manufacturing method thereof according to Example 2 of the present invention, the airtightness at the joint interface 4A is higher than before the airtight holding groove 5A is formed. Bonding is obtained, and the path for gas and liquid to enter is blocked, making it difficult for gas and liquid to leak, and ensuring high air tightness and liquid tightness between the metal member 2A and the dissimilar member 3A. Can do. In Examples 1 and 2, the aluminum alloy metal members 2 and 2A are inserted into the injection mold in advance, and then the PPS material made of a synthetic resin material is injection-molded as the dissimilar members 3 and 3A. The metal composite joined body 1 and 1A, but this method was carried out in Example 1 and Example 1 using a material having a high melting temperature, such as stainless steel, for the metal member and aluminum having a melting temperature lower than that of the metal member for the dissimilar member. Similarly to Example 2, the present invention can also be applied to die casting in which a dissimilar material is poured after a metal member is inserted into a mold.

[Example 3]
Next, the seal structure of the metal composite joined body according to Example 3 of the present invention will be described with reference to FIG. As shown in FIG. 5 (b), the metal composite joined body 1B according to the third embodiment includes a metal member 2B made of a disk-shaped aluminum alloy material inside a dissimilar member 3B made of a cylindrical PPS material. Are joined together.
And the airtight holding groove | channel 5B is formed in the outer peripheral surface of the dissimilar member 2B which consists of a disk-shaped aluminum alloy material by laser processing.
As shown in FIG. 5 (b), the metal member 2B made of such an aluminum alloy material is set in an injection mold, and the dissimilar member 3B made of a PPS material is injection-molded and integrally joined. A metal composite joined body 1B according to Example 3 is configured.

That is, in the range of the joint boundary surface 4B where the metal member 2B is in contact with the dissimilar member 3B, laser scanning is performed along the direction intersecting the direction that requires airtightness of the joint boundary surface 4B, and the pitch is 100 μm. An airtight holding groove 5B having a depth of 5 μm to 15 μm is formed.
Next, a joining step is performed in which the laser-processed metal member 2B is made into the dissimilar member 3B. Then, a resin molding step, which is so-called insert molding, is performed in which the laser-processed metal member 2B is set in an injection mold and the dissimilar member 3B is injection molded. The laser processing conditions and injection molding conditions were the same as those in Example 1 above.
As a result, the dissimilar member 3B in the molten state enters the airtight holding groove 5B, and the metal member 2B and the dissimilar member 3B are joined without a gap, and the metal composite joined body 1B according to the third embodiment is obtained.

  Thus, in the metal composite joined body seal structure and the manufacturing method thereof according to Example 3 of the present invention, the airtightness at the joint interface 4B is higher than before the airtight holding groove 5B is formed. Since joining is obtained and there is no path for gas and liquid to enter, it is very difficult for gas and liquid to leak, ensuring high airtightness and liquid tightness between the metal member 2B and the dissimilar member 3B. Can do.

[Example 4]
Next, the seal structure of the metal composite joined body according to Example 4 of the present invention will be described with reference to FIG.
As shown in FIG. 6A, the metal composite joined body 1C according to the fourth embodiment has two pieces in two through holes 6C of a dissimilar member 3C made of a flat PPS material as a synthetic resin material. The metal member 2C made of a flat aluminum alloy material is inserted halfway.
Airtight holding grooves 5C are respectively formed by laser processing on four surfaces of the two metal members 2C made of a flat aluminum alloy material.
As shown in FIG. 6A, the metal member 2C made of the aluminum alloy material is integrated with the dissimilar member 3C made of the PPS material, thereby forming the metal composite joined body 1C according to the fourth embodiment. .

  That is, in the range of the joint boundary surface 4C where the metal member 2C made of an aluminum alloy material is in contact with the dissimilar member 3C made of the PPS material, along the direction intersecting the direction that requires the airtightness of the joint boundary surface 4C. By laser scanning, an airtight holding groove 5C having a depth of 5 μm to 15 μm is formed at a pitch of 100 μm, and within the range of the joint boundary surface 4C where the metal member 2C is in contact with the dissimilar member 3C, The front and back surfaces are laser-scanned along a direction intersecting the direction that requires airtightness of the joint boundary surface 4C to form an airtight holding groove 5C having a depth of 5 μm to 15 μm at a pitch of 100 μm.

Next, the metal member 2C made of a laser-processed aluminum alloy material is set in an injection mold, and the dissimilar member 3C made of a PPS material is injection-molded to perform a joining process.
Thus, in the metal composite joined body seal structure and the manufacturing method thereof according to Example 4 of the present invention, the airtightness at the joint interface 4C is higher than before the airtight holding groove 5C is formed. Since bonding is obtained and gas and liquid cannot enter, high air tightness and liquid tightness between the metal member 2C made of gas or metal material and the dissimilar member 3C can be ensured.

[Example 5]
Next, the seal structure of the metal composite joined body according to Example 5 of the present invention will be described with reference to FIG.
As shown in FIG. 6 (b), the metal composite joined body 1D according to the fifth embodiment is configured so as to block the through hole 6D provided at the center of the metal member 2D made of a disk-shaped aluminum alloy material. A dissimilar member 3D made of a PPS material as a disc-shaped synthetic resin material is joined.
An airtight holding groove 5D is concentrically formed by laser processing around a through hole 6D provided at the center of a metal member 2D made of a disk-shaped aluminum alloy material.
As shown in FIG. 6B, the metal member 2D made of the aluminum alloy material is superposed on the dissimilar member 3D made of the PPS material to impart ultrasonic vibration, microwaves, etc., and the dissimilar member is applied to the metal member 2D. By melting and joining 3D and integrating them, a metal composite joined body 1D according to the fifth embodiment is configured.

That is, in the range of the joint boundary surface 4D where the metal member 2D made of an aluminum alloy material is in contact with the dissimilar member 3D made of the PPS material, along the direction intersecting the direction that requires airtightness of the joint boundary surface 4D. As a result of the laser scanning concentrically, an airtight holding groove 5D having a depth of 5 μm to 15 μm is formed at a pitch of 100 μm.
Next, the metal member 2D made of a PPS material is superimposed on the metal member 2D made of a laser-processed aluminum alloy material, and the metal member 2D is heated by applying mechanical heating or microwaves by ultrasonic vibration, or By heating the metal member 2D directly with a heat source such as a heater, the joining boundary surface of the dissimilar member 3D is melted, and the dissimilar member 3D is joined to the metal member 2D to perform the joining process.
As a result, the metal member 2D and the dissimilar member 3D are joined without a gap, and a metal composite joined body 1D is obtained.

  Thus, in the metal composite joined body seal structure and the manufacturing method thereof according to Example 5 of the present invention, the airtightness at the joint interface 4D is higher than before the airtight holding groove 5D is formed. While joining is obtained and gas and liquid cannot enter, high air tightness and liquid tightness between the metal member 2D and the dissimilar member 3D can be ensured.

[Example 6]
Next, the seal structure of the metal composite joined body according to Example 6 of the present invention will be described with reference to FIG.
As shown in FIG. 6C, the metal composite joined body 1E according to the sixth embodiment has a through hole 6E provided at the center of a dissimilar member 3E made of a disk-like PPS material as a synthetic resin material. A metal member 2E made of a disk-shaped aluminum alloy material is joined so as to be closed.
An airtight holding groove 5E having a larger diameter than the through hole 6E is concentrically formed on one surface of the metal member 2E made of a disk-shaped aluminum alloy material by laser processing.
As shown in FIG. 6C, the metal member 2E made of the aluminum alloy material is integrally joined with the dissimilar member 3E made of the PPS material, thereby forming the metal composite joined body 1E according to the sixth embodiment. Is done. Also in this example, the metal member 2E and the dissimilar member 3E are joined by placing the metal member 2E on the upper surface of the dissimilar member 3E and melting the portion of the dissimilar member 3E that contacts the metal member 2E by vibration welding. This is an example of 4E bonded without gaps.

That is, in the range of the assembly boundary surface 4E where the metal member 2E is in contact with the dissimilar member 3E, the circular airtight holding groove 5E intersecting with the direction that requires airtightness of the joint boundary surface 4E It is formed by laser scanning at a pitch of 100 μm and a depth of 5 μm to 15 μm so as to be concentric in a direction that requires the property. Next, the laser-processed metal member 2E is heated on the dissimilar member 3E in the same manner as in the sixth embodiment, so that the joining boundary surface of the dissimilar member 3E is melted and filled into the airtight holding groove 5E. As a result, bonding is achieved.
As a result, the metal member 2E made of an aluminum alloy material and the dissimilar member E made of the PPS material 3 are joined without a gap, and the metal composite joined body 1E according to the sixth embodiment is obtained.

At this time, the metal member 2E and the dissimilar member 3E are along the direction that intersects the direction that requires airtightness of the joint boundary surface 4E, that is, along the direction that shields the fluid from flowing. Since the airtight holding grooves 5E that circulate around the surface of the joint boundary surface are formed at predetermined intervals in the direction that requires airtightness, that is, the direction in which the fluid flows, the number of the grooves is increased. Since the airtight holding grooves 5E are formed in a number of stages, the flow of fluid can be prevented. Even if a small amount of gas or liquid enters the airtight holding grooves 5E, the other airtight holding grooves 5E Airtightness can be secured by the joint surface.
Thus, in the metal composite joined body seal structure and the manufacturing method thereof according to Example 6 of the present invention, the airtightness at the joint interface 4E is higher than before the airtight holding groove 5E is formed. While joining is obtained and there is no path for gas and liquid to enter, high airtightness and liquid tightness between the metal member 2E and the dissimilar member 3E can be ensured.

  In the seal structure of the metal composite joined body according to the present embodiment, the metal members 2, 2A, 2B, 2C, 2D, 2E and the dissimilar members 3, 3A, 3B, 3C, 3D, 3E made of nonmetal are assembled. The metal composite joined body 1, 1A, 1B, 1C, 1D, 1E has a seal structure, and includes metal members 2, 2A, 2B, 2C, 2D, 2E and dissimilar members 3, 3A, 3B, 3C, 3D, 3E In the joint boundary surfaces 4, 4A, 4B, 4C, 4D, and 4E that face each other, the metal member extends along a direction that intersects the direction that requires airtightness of the joint boundary surfaces 4, 4A, 4B, 4C, 4D, and 4E. A plurality of annular airtight holding grooves 5, 5A, 5B, 5C, 5D and 5E having a predetermined depth and a predetermined pitch are formed on the surfaces of 2, 2A, 2B, 2C, 2D and 2E, and metal members 2, 2A and 2B are formed. , 2C, 2D, 2E and different members 3, 3A, 3B, 3 , By joining 3D, the 3E, bonding interface 4, 4A, gave 4B, 4C, 4D, and airtightness to 4E.

  In the method for manufacturing a seal structure of a metal composite joined body according to the present invention, a metal composite joint obtained by joining metal members 2, 2A, 2B, 2C, 2D, 2E and dissimilar members 3, 3A, 3B, 3C, 3D, 3E. A method for manufacturing a seal structure of bodies 1, 1A, 1B, 1C, 1D, 1E, wherein metal members 2, 2A, 2B, 2D, 2E and opposite members 3, 3A, 3B, 3C, 3D, 3E are opposed to each other In the joining boundary surfaces 4, 4A, 4B, 4C, 4D, 4E, the metal members 2, along the direction intersecting the direction that requires airtightness of the joining boundary surfaces 4, 4A, 4B, 4C, 4D, 4E. An airtight structure in which airtight holding grooves 5, 5A, 5B, 5C, 5D, and 5E having a predetermined depth are formed at predetermined pitches in a direction that requires airtightness at joint boundaries of 2A, 2B, 2C, 2D, and 2E. Holding process and airtight holding grooves 5, 5A, 5B, 5C 5D, 5E are formed metal member 2,2A, 2B, 2C, 2D, different members 3,3A on the surface of the 2E, 3B, 3C, is made of a bonding step of bonding 3D, the 3E.

Bonding interface surfaces 4, 4A, 4B, 4C, 4D, 4E facing the above-mentioned intimate metal members 2, 2A, 2B, 2C, 2D, 2E and the dissimilar members 3, 3A, 3B, 3C, 3D, 3E. The circumferential airtight holding grooves 5, 5A, 5B, 5C, 5D, and the joining boundary surfaces of the metal members 2, 2A, 2B, 2C, 2D, and 2E along the direction that intersects the direction that requires airtightness. A plurality of 5Es are formed at a predetermined pitch along a direction that requires airtightness, and different members 3, 3A, 3B, 3C, 3D, and 3E are melted in the airtight holding grooves 5, 5A, 5B, 5C, 5D, and 5E. Since it joins by making it penetrate | invade, it can ensure the airtightness of the joining interface 4,4A, 4B, 4C, 4D, 4E.
In particular, the surfaces formed when the metal members 2, 2A, 2B, 2C, 2D, 2E and the dissimilar members 3, 3A, 3B, 3C, 3D, 3E are joined are the joint boundary surfaces 4, 4A, 4B, 4C. , 4D, and 4E become uneven surfaces along the direction that requires airtightness, the bonding area is increased, and compared to before the airtight holding grooves 5, 5A, 5B, 5C, 5D, and 5E are formed. As a result, there is no path for the gas and liquid to enter at the joint interfaces 4, 4A, 4B, 4C, 4D, and 4E, so that the gas and liquid are difficult to flow, and the airtightness and liquid tightness are greatly increased. improves.

  In each of the above embodiments, only the case where an aluminum alloy is used as the metal material has been described. However, the metal material is not limited to this, and aluminum, magnesium, magnesium alloy, iron, steel, stainless steel, copper, copper An alloy, beryllium, beryllium alloy, nickel, nickel alloy, titanium, titanium alloy, or the like can be used.

  In each of the above embodiments, only the case where polyphenylene sulfide (PPS), which is a synthetic resin material, is used as the dissimilar member 3, 3A, 3B, 3C, 3D, 3E has been described. , 3C, 3D, and 3E are not limited to the synthetic resin material, and an elastomer containing natural rubber and synthetic rubber, or a metal material other than the metal material used for the metal member can also be used.

  Furthermore, in each of the above-described embodiments, only the case where polyphenylene sulfide (PPS) is used as the synthetic resin material has been described. However, the synthetic resin material is not limited to this and includes super engineering plastics other than PPS. Thermoplastic resins and thermosetting resins can also be used.

In each of the above embodiments, the method of forming the airtight holding grooves 5, 5A, 5B, 5C, 5D, 5E on the surfaces of the metal members 2, 2A, 2B, 2C, 2D, 2E has a wavelength of 1.064 μm. Although only the case of the laser processing method using the YVO4 laser has been described, the laser light oscillation device used for the laser processing method is not limited to the YVO4 laser, but a YAG laser having a wavelength of 1.064 μm, a wavelength of 10.6 μm Various laser light oscillators such as a CO ₂ laser, an excimer laser, and an argon laser can be used.
Furthermore, the method of forming the airtight holding grooves 5, 5A, 5B, 5C, 5D, and 5E on the surfaces of the metal members 2, 2A, 2B, 2C, 2D, and 2E is not limited to the laser processing method.

  In carrying out the present invention, the metal composite joints 1, 1A, 1B, 1C, 1D, and 1E are made of metal composite materials, configurations, shapes, quantities, sizes, connection relationships, manufacturing methods, and the like. The other steps of the manufacturing method of the bonded structure sealing structure are not limited to the above embodiments.

When carrying out the present invention, the injection molding process can be a joining process. For example, in FIG. 2, a so-called insert molding injection molding process (joining process) is performed in which a laser-processed aluminum alloy material 2 a is set in an injection mold and a synthetic resin material 3 a is injection molded. (Step S5). As the injection molding conditions, the resin temperature was 300 ° C. to 340 ° C., the injection pressure was 200 MPa, and the holding pressure was 80 MPa.
In addition, the injection molding of the synthetic resin material 3a made of PPS (melting point: 280 ° C.) is performed within a resin temperature range of 300 ° C. to 340 ° C., an injection pressure range of 100 MPa to 250 MPa, and a holding pressure range of 30 MPa to 100 MPa. It is preferable to be implemented.

As a result, as shown in FIG. 1, the synthetic resin material 3a in a molten state enters the airtight holding groove 5, the aluminum alloy material 2a and the synthetic resin material 3a are joined, and airtightness and liquid tightness are required. The joined surface along the direction (that is, the direction perpendicular to the airtight holding groove 5) becomes a continuous surface with fine irregularities, and the metal composite joined body 1 according to the first embodiment is obtained.
About the airtightness of the obtained metal composite joined body 1, the airtightness test apparatus 1 as shown in FIG.
The test was conducted using 0, and the result was the same as the above example.

  That is, in the said Example, although it does not specify about joining, the joining process of metal member 2,2A, 2B, 2C, 2D, 2E and dissimilar member 3,3A, 3B, 3C, 3D, 3E is injection molding etc. Any bonding means that can be fused is acceptable.

  In any case, weight reduction, insulation, which is a characteristic of different members 3, 3A, 3B, 3C, 3D, 3E such as synthetic resin, and high strength which is a characteristic of metal members 2, 2A, 2B, 2C, 2D, 2E When combined with conductivity and electromagnetic shielding properties, the metal composite joints 1, 1A, 1B, 1C, 1D, and 1E that efficiently satisfy the required functions of automobile parts and electronic parts are designed. Can be produced. However, in general, electronic parts are required to have a combined technology having airtightness and liquid-tightness in order to prevent leakage of moisture from outside air and rain, and automobile parts to prevent leakage of cooling oil. In the conventional method, an adhesive is used. However, a process such as pressure welding, heating and cooling to one bonding part of masking application is required. However, in the present invention, it becomes unnecessary and the process can be shortened.

  Accordingly, the metal members 2, 2A, 2B, 2C, 2D, 2E and the non-metal dissimilar members 3, 3A, 3B, which have a high degree of freedom in design and are effective in providing air tightness and liquid tightness to the fluid. Metal composite joints 1, 1A, 1B, 1C, 1D, and 1E assembled with 3C, 3D, and 3E can be obtained, and a wide range of applications and development are possible.

  Note that the numerical values given in the examples of the present invention are not all critical values, and certain numerical values indicate appropriate values suitable for implementation. It does not deny implementation.

1, 1A, 1B, 1C, 1D, 1E Metal composite joint 2, 2A, 2B, 2C, 2D, 2E Metal member 2a Aluminum alloy material 3, 3A, 3B, 3C, 3D, 3E Dissimilar member 3a Synthetic resin material 4 , 4A, 4B, 4C, 4D, 4E Joint interface 5, 5A, 5B, 5C, 5D, 5E Airtight holding groove

Claims (8)

A metal composite joined body having a joining interface between the metal member and the dissimilar material, wherein the metal member and the dissimilar member having different physical properties are joined to each other. ,
Forming a plurality of airtight holding grooves on the surface of the metal member in a direction that requires airtightness of the joint boundary surface, along a direction that intersects a direction that requires airtightness of the joint boundary surface; A sealing structure for a metal composite joined body, wherein the metal interface and the dissimilar member are melt-bonded to provide airtightness to the joint interface.   2. The metal composite joint sealing structure according to claim 1, wherein the dissimilar material of the dissimilar member is a synthetic resin material, and is melt-bonded to the metal member by injection molding the dissimilar member. .   3. The seal structure for a metal composite joined body according to claim 1, wherein the airtight holding groove is formed by a laser processing method.   4. The airtight holding groove according to claim 1, wherein a plurality of the airtight holding grooves are formed at a depth within a range of 2 μm to 30 μm and at a pitch within a range of 20 μm to 200 μm. Seal structure of the metal composite joined body described in 1. Method of manufacturing a seal structure of a metal composite joined body in which a metal member of a metal material and a dissimilar member of a different material having different physical properties are joined to each other and a joining interface between the metal material and the dissimilar material is opposed to each other Because
A plurality of hermetic holding grooves that circulate around the surface of the metal member along a direction intersecting a direction that requires airtightness of the joint boundary surface in a direction that requires airtightness of the joint boundary surface. A process for forming a retaining groove,
A method for producing a seal structure of a metal composite joined body, comprising: a joining step of providing airtightness to the joining interface by melt-joining the metal member and the dissimilar member.   6. The method for producing a seal structure of a metal composite joined body according to claim 5, wherein the dissimilar material is a synthetic resin material, and the joining step is an injection molding step of the synthetic resin material.   The method of manufacturing a seal structure of a metal composite joined body according to claim 5 or 6, wherein the airtight holding groove forming step is a laser processing step of the metal material.   8. The airtight holding groove according to claim 5, wherein a plurality of the airtight holding grooves are formed at a depth within a range of 2 [mu] m to 30 [mu] m and at a pitch within a range of 20 [mu] m to 200 [mu] m. The manufacturing method of the sealing structure of the metal composite joined body as described in one.

Images