JP2014065288A - Composite molding and production method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a production method of a composite molding that can raise bond strength.SOLUTION: A production method of a composite molding includes: a process in which when a laser beam is irradiated to a joint area of a metal molding 10 to form a pore group, a laser beam is irradiated so that a depth of a pore formed by 1 scan may become 10-200 μm, a pore in which a cross-sectional shape is a triangle or a shape having approximation with the same is formed, thereby a projection group consisting of burr is formed on a surface of a periphery of an apertural area of the pore group; and a process in which a part including a joint area of the metal molding 10 in which the pore group and the projection group are formed is arranged in a mold to perform insert molding with resin becoming a resin molding 20.

Description

  The present invention relates to a composite molded body composed of a metal molded body and a resin molded body, and a method for producing the same.

From the viewpoint of reducing the weight of various parts, resin molded bodies are used as metal substitutes, but it is often difficult to substitute all metal parts with resin. In such a case, it is conceivable to manufacture a new composite part by joining and integrating the metal molded body and the resin molded body.
However, a technique capable of joining and integrating a metal molded body and a resin molded body with an industrially advantageous method with high bonding strength has not been put into practical use.

Patent Document 1 discloses a laser on a metal surface for bonding to a different material (resin), including a step of laser scanning with respect to a metal surface in one scanning direction and a step of laser scanning in a scanning direction crossing the scanning direction. An invention of a processing method is described.
Patent Document 2 discloses an invention of a laser processing method in which the laser scanning is performed in a superposed manner a plurality of times in the invention of Patent Document 1.

However, since the inventions of Patent Documents 1 and 2 must always perform laser scanning in two crossing directions, there is room for improvement in that the processing time is too long.
Furthermore, since sufficient surface roughening treatment can be performed by laser scanning in the cross direction, it is considered that the bonding strength can be increased, but the surface roughness state is not uniform, and the directionality of the strength of the bonded portion between the metal and the resin There is a problem that may not be stable.
For example, one joined body has the highest shearing force and tensile strength in the X-axis direction, while the other joined body has the highest shearing force and tensile strength in the Y-axis direction different from the X-axis direction. There is a possibility that the bonded body of the above may have the highest shearing force and tensile strength in the Z-axis direction different from the X-axis and Y-axis directions.
Depending on the product (for example, a rotating body part in one direction or a reciprocating part in one direction), a metal / resin composite having high bonding strength in a specific direction may be required. In the invention of 2, the above-mentioned demand cannot be sufficiently met.

  In addition, when the joint surface has a complicated shape or a shape including a narrow portion (for example, a star shape, a triangle, or a dumbbell type), the surface is partially roughened by the laser scanning method in the cross direction. As a result of non-uniformity, it may be considered that sufficient bonding strength cannot be obtained.

Patent Document 3 describes a method of manufacturing an electrical / electronic component in which a metal surface is irradiated with laser light to form irregularities, and a resin, rubber, or the like is injection-molded on the irregularity formation site.
In Embodiments 1 to 3, it is described that the metal long coil surface is irradiated with laser to form irregularities. In paragraph No. 10, the surface of the long metal coil is roughened in a striped or satin shape. In paragraph No. 19, the surface of the long metal coil is roughened in a stripe, dotted, wavy, knurled, or satin. It is described.
However, as described in the effects of the inventions in paragraphs 21 and 22, the purpose of laser irradiation is to form fine irregular irregularities on the metal surface, thereby enhancing the anchor effect. In particular, since the object to be processed is a long metal coil, it is considered that any irregularities are inevitably formed into fine irregular irregularities.
Therefore, the invention of Patent Document 3 discloses the same technical idea as the invention of forming fine irregularities on the surface by laser irradiation in the cross direction as in Patent Documents 1 and 2.

Japanese Patent No. 4020957 JP 2010-167475 A JP-A-10-294024

An object of the present invention is to provide a composite molded body having a higher bonding strength.
Moreover, this invention makes it another subject to provide the manufacturing method of the said composite molded object.

The present invention
A composite molded body in which a metal molded body and a resin molded body are joined,
The metal molded body has a pore group consisting of a combination of independent pores formed on the joint surface by laser light irradiation,
The pore group has a projection group formed on the surface around each opening,
Provided is a composite molded body in which the composite molded body is joined in a state where a resin enters the pores of the metal molded body and the projection group is embedded in the resin, and a method for manufacturing the composite molded body. .

The present invention also provides
A composite molded body in which a metal molded body and a resin molded body are joined,
The metal molded body has a groove group formed of a combination of independent grooves formed on the bonding surface by laser light irradiation,
The groove group has a protrusion group formed on the surfaces on both sides of each opening,
Provided is a composite molded body in which the composite molded body is joined in a state where a resin enters a groove of the metal molded body and the projection group is embedded in the resin, and a method for manufacturing the composite molded body.

  According to the composite molded body and the manufacturing method thereof of the present invention, the bonding strength between the metal molded body and the resin molded body can be increased.

Sectional drawing (a partial enlarged view is included) of the thickness direction of the composite molded object of this invention. It is sectional drawing of the diameter direction of the composite molded object which is other embodiment of this invention, (a) is the figure seen from the side surface, (b) is the figure seen from the end surface. The top view which shows the formation state of the pore group and groove group which were formed in the composite molded object of this invention. Sectional drawing of the thickness direction of the pore group (or groove group) and protrusion group which were formed in the composite molded object of this invention. (A)-(h) is a figure which shows the pore group (or groove group) and protrusion group of a different shape in the composite molded object of this invention. (A), (b) is a top view which shows the formation state of the pore group in the composite molded object of this invention. (A) is a top view which shows the formation state of the pore group and protrusion group in the composite molded object of this invention, (b) is a fragmentary sectional view of the thickness direction of (a). (A)-(h) is a top view which shows the formation pattern from which the groove group in the composite molded object of this invention differs. The top view which shows the formation state of the groove group and protrusion group in the composite molded object of this invention. The figure for demonstrating the measuring method of the joint strength in an Example. SEM photograph of the cross section in the thickness direction of the composite molded article of Example 1, 4 is an SEM photograph of a cross section in the thickness direction of the composite molded body of Example 2. FIG. 4 is an SEM photograph of a cross section in the thickness direction of the composite molded body of Comparative Example 1. The figure for demonstrating the measuring method of the joint strength of the composite molded object of Example 1 and the comparative example 1. FIG. 3 is an SEM photograph of the composite molded body of Example 3. 4 is an SEM photograph of the composite molded body of Example 4. 6 is an SEM photograph of the composite molded body of Example 5. 6 is an SEM photograph of the composite molded body of Example 6. 4 is an SEM photograph of the composite molded body of Example 7. FIG. 4 is an SEM photograph of the composite molded body of Example 8.

<Composite molded body>
(1) Composite molded body of FIG. 1 A composite molded body 1 of FIG. 1 is obtained by joining and integrating a flat metal molded body 10 and a flat resin molded body 20. FIG. 1 also shows an enlarged view in which a portion surrounded by a small circle is enlarged.
As shown in FIGS. 3 and 4, the joining surface 12 of the flat metal molded body 10 before joining and integration is a pore group 30 composed of a combination of independent pores 31 formed by laser light irradiation. And a projection group (projection) 32 formed on the surface around the opening of the pore group 30 (pore 31).
The composite molded body 1 is joined in a state where the resin enters the pore group 30 (pore 31) of the metal molded body 10 and the projection group 32 is embedded in the resin.

The composite molded body 1 shown in FIG. 1 has grooves as shown in FIGS. 3 and 4 in place of the pore group 30 (pore 31) on the joint surface 12 of the flat metal molded body 10 before being joined and integrated. The group 40 (groove 41) may be formed.
The groove group 40 is composed of a combination of independent grooves 41 formed by laser light irradiation. Further, the groove group 40 (groove 41) has protrusion groups (protrusions) formed on both sides of the opening of the groove group 40 (groove 41). 42).
The composite molded body 1 is joined in a state where the resin enters the groove group 40 (groove 41) of the metal molded body 10 and the projection group 42 is embedded in the resin.

  The composite molded body 1 shown in FIG. 1 includes a combination of pore groups 30 (pores 31) and projection groups 32 and groove groups 40 (grooves) on the joint surface 12 of the flat metal molded body 10 before being joined and integrated. 41) and the combination of the projection group 42 may be formed.

(2) Composite Molded Body of FIG. 2 The composite molded body includes a round bar metal molded body 10 and a round bar resin molded body 20 as shown in FIG. It can be joined and integrated.
The composite molded body 1 in FIG. 2 includes a combination of the pore group 30 (pore 31) and the projection group 32, and the groove group 40 (on the joint surface 12 of the round metal rod body 10 before being joined and integrated. A groove in which one or both of the combination of the groove 41) and the protrusion group 42 is formed is used.

  In the composite molded body 1, the shapes and sizes of the metal molded body 10 and the resin molded body 20 are appropriately selected depending on the application, and are not limited to FIGS. 1 and 2.

In the composite molded body 1 in FIG. 1, the bonding strength between the metal molded body 10 and the resin molded body 20 (strength evaluated by the tensile strength described in the examples) should be appropriately adjusted according to the application of the composite molded body 1. For example, a low bonding strength of 1 MPa or more and 20 MPa or less can be achieved, and a bonding strength exceeding 20 MPa can be achieved.
In the case of the composite molded body 1 shown in FIG. 2, it can be measured according to the tensile test described in the examples.
That is, in the composite molded body 1 of FIG. 2, after fixing the end of the metal molded body 10, the center axis direction of the metal molded body 10 and the resin molded body 20 (in FIG. 14) under the predetermined conditions described in the example. (Corresponding to the X1 direction).

<Method for producing composite molded body-1>
Next, a method for manufacturing the composite molded body 1 shown in FIGS. 1 and 2 will be described.
As shown in FIG. 3, the joining surface 12 of the metal molded body 10 before being joined and integrated is irradiated with a laser beam, and as shown in FIG. A groove group 40 is formed.
When the pore group 30 or the groove group 40 is formed on the joint surface 12 of the metal molded body 10 before being joined and integrated, the pores 31 or the grooves 41 can be formed randomly or have regularity. It can also be formed.
When the pore group 30 (pore 31) or the groove group 40 (groove 41) is formed on the joint surface 12 of the metal molded body 10 before being joined and integrated, it can also be formed on the entire joint surface 12. If the desired bonding strength can be obtained, it can be formed on a part of the bonding surface 12.

When forming the pore group 30 composed of a large number of pores 31 or the groove group 40 composed of a large number of grooves 41, the depth of the pores or grooves formed (perforated) by laser light irradiation of one scan Is 10 to 200 μm.
The depth of the pores or grooves after the full scan is set to 10 to 2000 μm.
The irradiation conditions of the laser beam when forming such a pore group 30 composed of a large number of pores 31 or a groove group 40 composed of a large number of grooves 41 are as follows.
The output is preferably 4 to 400W.
The wavelength is preferably from 300 to 1200 nm, more preferably from 500 to 1070 nm.
The pulse width of one scan (irradiation time of laser light of one scan) is preferably 1 to 100,000 nsec, and more preferably 1 to 100 nsec.
The frequency is preferably 1 to 100 kHz.
The beam diameter is preferably 5 to 200 μm, more preferably 5 to 100 μm, and further preferably 5 to 50 μm.
The focal position is preferably −10 to +10 mm, more preferably −6 to +6 mm.
The processing speed is preferably 1 to 10,000 mm / sec, more preferably 1 to 5,000 m / sec, and still more preferably 1 to 1,000 mm / sec.
The number of scans is preferably 1 to 10 times.
The cross-sectional shape of each of the pores 31 or the grooves 41 (the cross-sectional shape when cut in the thickness direction in FIG. 1 and the cross-sectional shape when cut in the diameter direction in FIG. 2) is triangular or The shape approximates that.

In the composite molded body 1, a method of adjusting the magnitude of the bonding strength (strength evaluated by the tensile strength described in the examples) between the metal molded body 10 and the resin molded body 20 will be described with reference to FIG. 4.
(I) a method of adjusting F / D (aspect ratio), which is a ratio of pore opening diameter (or groove width) (D) and pore (or groove) depth (F),
(II) a method of adjusting the height and amount of burrs by adjusting the cross-sectional shape of the pores (or grooves) (the angle of the two sides with respect to the portion corresponding to the base of the triangle),
Can be implemented in combination.
In the method (II), for example, if the angle (acute angle) of the two sides with respect to the portion corresponding to the base of the triangle is 45 ° to less than 90 ° (deep angle), the burrs tend to be high and increase. If it is less than ° (shallow angle), burrs tend to be low and low.
When the aspect ratio is increased, the bonding strength is increased, and when the aspect ratio is decreased, the bonding strength is decreased.
When the height of the burr is increased and the amount is increased, the bonding strength is increased, the height of the burr is decreased, and when the amount is decreased, the bonding strength is decreased.
Here, for example, when FIG. 5 (a) is compared with FIG. 5 (f), the amount of burr is larger in FIG. 5 (a).
It should be noted that if the height of the burr is too high, it will be cut off in the middle, so that it is difficult to make a big difference in height.

By projecting the laser beam as described above to form the pore group 30 or the groove group 40, the protrusion 32 made of burrs on the surface (bonding surface 12) around the pore group 30 (pore 31). Alternatively, a large number of protrusions 42 made of burrs are formed on the surfaces (bonding surfaces 12) on both sides of the opening of the groove group 40 (groove 41) to form the protrusion group (protrusion) 32 or the protrusion group (protrusion) 42.
The burr forming the projection group 32 or the projection group 42 is formed by irradiating the surface of the metal molded body 10 with a laser beam to perforate, so that the metal removed by the perforation is raised around the opening. 12 are attached together.
The protrusions 32 made of burrs are shown in FIG. 4 for easy understanding, but have various shapes and sizes as shown in FIGS. 5A to 5H, for example.
FIGS. 5A to 5D show a state in which burrs are formed all around (or most of) the periphery of the opening, and the right side of FIG. 5E is formed in the adjacent opening. FIG. 5 (f) shows a state where burrs are formed around a part of the opening, and FIG. 5 (g) (H) has shown the state which the burr | flash deform | transformed.
The protrusion 42 includes one having the same shape as that shown in FIG.

When the pore group 30 (pore 31) is formed on the joining surface 12 of the metal molded body 10 before being joined and integrated, for example, as shown in FIGS. 6 (a) and 6 (b), there is regularity. In this way, it can be formed.
FIG. 6A shows a case in which the pore group 30 is formed by alternately forming the pores 31 having square openings in the vertical direction and the horizontal direction on the joint surface 12 of the metal molded body 10.
In FIG. 6A, the openings of the adjacent pores 31 are arranged so as to contact only at the corners without contacting the sides.
In FIG. 6A, a large number of protrusions 32 (see FIG. 7) made of burrs are formed on the joint surface 12 around the square opening of the pore 31, and the protrusion group 30 is formed.
At this time, when protrusions 32 made of burrs are formed on all four sides of the square opening of the pore 31, the state is as shown in FIGS. At this time, a cup-shaped protrusion 32 having the bonding surface 12 as a bottom surface and four side burrs as side surfaces is formed.

FIG. 6B shows a case in which the pores 31 having circular openings are formed on the bonding surface 12 of the metal molded body 10 so that the openings of adjacent pores 31 are not in contact with each other with a gap therebetween. .
In FIG. 6B, a large number of protrusions 32 (see FIG. 4) made of burrs are formed on the joint surface 12 around the opening of the circular pore 31, and a protrusion group is formed.
At this time, when protrusions made of burrs are formed on the entire outer periphery of the circular opening of the pores 31, passage-shaped protrusions 32 with the bonding surface 12 as the bottom surface and burrs as walls are formed. become.

When the groove group 40 (groove 41) is formed on the joint surface 12 of the metal molded body 10 before being joined and integrated, for example, various patterns as shown in FIGS. Can be formed.
FIGS. 8A to 8E are groove group patterns formed of a plurality of grooves formed linearly in the same direction or different directions at intervals.
FIG. 8F shows a pattern of a groove group composed of a plurality of grooves (wavy line grooves) formed in a curved line at intervals.
The groove group may be a combination of linear grooves and curved grooves.
FIGS. 8G and 8H show patterns of groove groups formed by a combination of a plurality of circular grooves formed at intervals (a combination of a plurality of concentric circles).
Instead of the circle shown in FIGS. 8G and 8H, a groove group in which a plurality of polygons are combined, or a groove group in which a circle and a polygon are combined may be used.
When the groove group 40 (groove 41) is formed, protrusions 42 are formed on both sides of the groove 41 as shown in FIG.
A portion sandwiched between the two protrusions 42 is in a state in which wall-shaped protrusions 42 are formed on both sides with the joint surface 12 as a bottom surface.

In the next step, a portion including the joint surface 12 of the metal molded body 10 in which the pore group 30 is formed is placed in a mold, and insert molding is performed using a resin that becomes the resin molded body 20, A composite molded body 1 is obtained.
By this insert molding process, as shown in FIG. 1, the resin enters the pores 31 (pore group 30) or the groove 41 (groove group 40), and the projection group 32 (42) is embedded in the resin. A composite molded body 1 in a state is obtained.
Thus, since the metal molded body 10 has the pore group 30 and the projection group 32, or the groove group 40 and the projection group 42, the contact area between the metal molded body 10 and the resin molded body 20 is increased. At the same time, the resin enters the pore group 30 or the groove group 40, and the bonding strength is enhanced by the anchor effect by the protrusion group 32 or the protrusion group 42 being embedded in the resin.
Further, by adjusting the arrangement state of the pore group 30 or adjusting the formation pattern of the groove group 40, it is possible to obtain a composite molded body with enhanced tensile strength and bending strength in a desired direction. .

The metal of the metal molded body used in the composite molded body of the present invention is not particularly limited, and can be appropriately selected from known metals according to applications. Examples thereof include those selected from iron, various stainless steels, aluminum or alloys thereof, zinc, magnesium, copper, lead, tin and alloys containing them.
The molding method of the metal molded body used in the composite molded body of the present invention is not particularly limited, and can be produced by applying various known molding methods according to the type of metal, for example, die casting. What was manufactured by the method can be used.

  Resin of the resin molded body used in the composite molded body of the present invention includes thermoplastic elastomers in addition to thermoplastic resins and thermosetting resins.

  A thermoplastic resin can be suitably selected from well-known thermoplastic resins according to a use. For example, polyamide-based resins (aliphatic polyamides such as PA6 and PA66, aromatic polyamides), copolymers containing styrene units such as polystyrene, ABS resin, AS resin, polyethylene, copolymers containing ethylene units, polypropylene, propylene Examples thereof include copolymers containing units, other polyolefins, polyvinyl chloride, polyvinylidene chloride, polycarbonate resins, acrylic resins, methacrylic resins, polyester resins, polyacetal resins, and polyphenylene sulfide resins.

  A thermosetting resin can be suitably selected from well-known thermosetting resins according to a use. For example, urea resin, melamine resin, phenol resin, resorcinol resin, epoxy resin, polyurethane, and vinyl urethane can be mentioned.

  A thermoplastic elastomer can be suitably selected from well-known thermoplastic elastomers according to a use. Examples thereof include styrene elastomers, vinyl chloride elastomers, olefin elastomers, urethane elastomers, polyester elastomers, nitrile elastomers, and polyamide elastomers.

These thermoplastic resins, thermosetting resins, and thermoplastic elastomers can be blended with known fibrous fillers.
Examples of known fibrous fillers include carbon fibers, inorganic fibers, metal fibers, and organic fibers.
Carbon fibers are well known, and PAN, pitch, rayon, lignin and the like can be used.
Examples of inorganic fibers include glass fibers, basalt fibers, silica fibers, silica / alumina fibers, zirconia fibers, boron nitride fibers, and silicon nitride fibers.
Examples of the metal fiber include fibers made of stainless steel, aluminum, copper and the like.
Examples of organic fibers include polyamide fibers (fully aromatic polyamide fibers, semi-aromatic polyamide fibers in which one of diamine and dicarboxylic acid is an aromatic compound, aliphatic polyamide fibers), polyvinyl alcohol fibers, acrylic fibers, polyolefin fibers, Synthetic fibers such as polyoxymethylene fibers, polytetrafluoroethylene fibers, polyester fibers (including wholly aromatic polyester fibers), polyphenylene sulfide fibers, polyimide fibers, liquid crystal polyester fibers, natural fibers (cellulosic fibers, etc.) and regenerated cellulose ( Rayon) fiber or the like can be used.

As these fibrous fillers, those having a fiber diameter in the range of 3 to 60 μm can be used. Among these, for example, the width of the marking pattern formed on the joint surface 11 of the metal molded body 10 ( It is preferable to use one having a fiber diameter smaller than the size of the opening of the pore or the width of the groove. The fiber diameter is more desirably 5 to 30 μm, and further desirably 7 to 20 μm.
When a fibrous filler having a fiber diameter smaller than the width of the marking pattern is used, a composite molded body in which a part of the fibrous filler is stuck in the marking pattern of the metal molded body is obtained. This is preferable because the bonding strength between the molded body and the resin molded body can be increased.
Furthermore, these fibrous fillers increase the mechanical strength of the resin molded body and increase the bonding strength between the metal molded body and the resin molded body by reducing the mechanical strength difference from the metal molded body. The weight average fiber length contained in the resin molded product is preferably 0.1 to 5.0 mm, more preferably 0.1 to 4.0 mm, still more preferably 0.2 to 3.0 mm, and most preferably 0. It is preferable to use a material having a length that can be 5 to 2.5 mm. As for the compounding quantity of the fibrous filler with respect to 100 mass parts of a thermoplastic resin, a thermosetting resin, and a thermoplastic elastomer, 5-250 mass parts is preferable. More preferably, it is 25-200 mass parts, More preferably, it is 45-150 mass parts.

  In the method for producing the composite molded body of the present invention, a known laser can be used, for example, YVO4 laser, YAG laser, fiber laser, semiconductor laser, glass laser, ruby laser, He-Ne laser, nitrogen laser, chelate laser. A dye laser can be used.

  Laser irradiation conditions, such as wavelength, beam diameter, pore spacing, frequency, etc., depend on the size, mass, type, and required bonding strength of the metal molded body and resin molded body to be bonded. It can be determined as appropriate.

Examples 1 and 2 and Comparative Example 1
In Examples 1 and 2, the joining surface 12 of the metal molded body (aluminum: A5052) shown in FIG. 10A is irradiated with laser under the conditions shown in Table 1, and as shown in FIG. 10B. A groove group in a state was formed.
After forming a groove group in the metal molded body, insert molding was performed by the following method to obtain composite molded bodies of Examples 1 and 2 and Comparative Example 1.
FIG. 11 is a SEM photograph of the cross section in the thickness direction of the composite molded body of Example 1 (100 times on the left side and 300 times on the right side), and FIG. 12 is a cross section in the thickness direction of the composite molded body of Example 2. 13 is an SEM photograph (300 times), and FIG. 13 is an SEM photograph (100 times on the left side and 300 times on the right side) of the cross section in the thickness direction of the composite molded body of Comparative Example 1.
From the comparison of FIGS. 11 to 13, it can be confirmed that in Examples 1 and 2, protrusions made of burrs are formed on both sides of the groove, and in Comparative Example 1, there is no protrusion.

<Insert molding (injection molding)>
Resin: GF60% reinforced PA66 resin (Plastotron PA66-GF60-01 (L9): manufactured by Daicel Polymer Co., Ltd.), fiber length of glass fiber: 11 mm
Resin temperature: 320 ° C
Mold temperature: 100 ° C
Injection molding machine: FUNAC ROBOSHOT S-2000i-100B

[Tensile test]
Using the composite molded bodies of Examples 1 and 2 and Comparative Example 1, a tensile test was performed to evaluate the bonding strength. The results are shown in Table 1.
In addition, the fiber length (weight average fiber length) of the glass fiber in the resin molded body of the composite molded body was 0.85 mm. As for the average fiber length, a sample of about 3 g was cut out from the molded article, heated and incinerated at 650 ° C., and glass fiber was taken out. The weight average fiber length was determined from a part (500) of the extracted fibers. As the calculation formula, [0044] and [0045] of JP-A-2006-274061 were used.
In the tensile test, the maximum load was measured when the metal molded body and the resin molded body were pulled in the X1 direction until the metal molded body and the resin molded body were broken while the end on the metal molded body side was fixed.
<Tensile test conditions>
Testing machine: Tensilon UCT-1T
Tensile speed: 5mm / min
Distance between chucks: 50mm

Example 3
In Example 3, a groove group in a state as shown in FIG. 10B is obtained by irradiating the joining surface 12 of the metal molded body (aluminum: A5052) shown in FIG. Formed.
After forming a groove group in the metal molded body, insert molding was performed in the same manner as in Examples 1 and 2 to obtain a composite molded body of Example 3.
(Laser irradiation conditions)
Laser model: J80-YHP70-106Q (LD-pumped Q-switched solid-state laser manufactured by Spectra-Physics)
Output: 11W
Wavelength: 1064nm
Pulse width: <80nsec
Frequency: 10kHz
Processing speed: 20mm / sec
Laser irradiation frequency (repetition frequency): 1 time, 3 times or 5 times Focal length: -2.4 mm
Number of grooves: 23

The upper part of FIG. 15 is an SEM photograph (all 200 times) of the surface of the metal molded body before joining with the resin of Example 3, and the lower part is an SEM photograph of the cross section in the thickness direction (left and center: 250 times). , Right side: 200 times).
From FIG. 15, it was confirmed that under the laser irradiation conditions of Example 3, when the number of times of laser irradiation (the number of repetitions) increased, the aperture diameter hardly changed, but the hole depth increased.
The numerical value (unit MPa) shown in the figure is the bonding strength between the metal molded body and the resin molded body.

Example 4
A composite molded body of Example 4 was obtained in the same manner as Example 3. Laser irradiation was performed under the following conditions.
(Laser irradiation conditions)
Laser model: J80-YHP70-106Q (LD-pumped Q-switched solid-state laser manufactured by Spectra-Physics)
Output: 11W
Wavelength: 1064nm
Pulse width: <80nsec
Frequency: 10kHz
Processing speed: 4mm / sec, 50mm / sec or 100mm / sec
Laser irradiation frequency (repetition frequency): 1 or 5 times Focal length: -2.4 mm
Number of grooves: 23

FIG. 16 is a SEM photograph of the cross section in the thickness direction of the metal molded body before joining with the resin of Example 4 (upper left: 200 times, upper right: 250 times, lower left: 150 times, lower center: 250 times) , Lower right 300 times).
The upper part of FIG. 16 shows the case where the number of times of laser irradiation is one and the processing speed is changed (increased) to 4 mm / s and 50 mm / s. The lower part of FIG. The case where the speed is changed (increased) to 4 mm / s, 50 mm / s, and 100 mm / s is shown.
From FIG. 16, it was confirmed that under the laser irradiation conditions of Example 4, when the processing speed was increased, the opening diameter was increased and the hole depth was decreased.
The numerical value (unit MPa) shown in the figure is the bonding strength between the metal molded body and the resin molded body.

Example 5
A composite molded article of Example 5 was obtained in the same manner as Example 3. Laser irradiation was performed under the following conditions.
(Laser irradiation conditions)
Laser model: J80-YHP70-106Q (LD-pumped Q-switched solid-state laser manufactured by Spectra-Physics)
Output: 11W
Wavelength: 1064nm
Pulse width: <80nsec
Frequency: 5kHz, 10kHz or 15kHz
Processing speed: 20mm / sec
Laser irradiation number (repetition number): 5 times Focal length: -2.4 mm
Number of grooves: 23

FIG. 17 is a SEM photograph (upper: 200 times, lower left: 200 times, lower right: 250 times) of the cross section in the thickness direction of the metal molded body before joining with the resin of Example 5.
FIG. 17 shows a case where the frequency is changed (increased) when the processing speed is 20 mm / s or 50 mm / s.
From FIG. 17, it was confirmed that under the laser irradiation conditions of Example 5, when the frequency increased, the aperture diameter became smaller and the change in the hole depth was small.
The numerical value (unit MPa) shown in the figure is the bonding strength between the metal molded body and the resin molded body.

Example 6
A composite molded article of Example 6 was obtained in the same manner as Example 3. Laser irradiation was performed under the following conditions.
(Laser irradiation conditions)
Laser model: J80-YHP70-106Q (LD-pumped Q-switched solid-state laser manufactured by Spectra-Physics)
Output: 11W
Wavelength: 1064nm
Pulse width: <80nsec
Frequency: 10kHz
Processing speed: 20mm / sec
Laser irradiation number (repetition number): 5 times Focal length: -2.4 mm
Number of grooves: 23, 30, 40

FIG. 18 is an SEM photograph (upper part: 200 times, lower part: 30 times) of a cross section in the thickness direction of the metal molded body before joining with the resin of Example 6.
FIG. 18 shows changes when the number of grooves is increased.
From FIG. 18, under the laser irradiation conditions of Example 6, when the number of grooves increases, the interval between the protrusion groups decreases, and when the number of grooves is 40, adjacent protrusion groups are fused and integrated (FIG. 5). (See (e)).
The numerical value (unit MPa) shown in the figure is the bonding strength between the metal molded body and the resin molded body.

Example 7
A composite molded article of Example 7 was obtained in the same manner as Example 3. Laser irradiation was performed under the following conditions.
(Laser irradiation conditions)
Laser model: J80-YHP70-106Q (LD-pumped Q-switched solid-state laser manufactured by Spectra-Physics)
Output: 11W
Wavelength: 1064nm
Pulse width: <80nsec
Frequency: 10kHz
Processing speed: 20mm / sec, 50mm / sec or 100mm / sec,
Laser irradiation frequency (repetition frequency): 2 Focal length: ± 0
Number of grooves: 60

FIG. 19 is an SEM photograph (upper part: 100 times, lower part: 250 times) of a cross section in the thickness direction of the metal molded body before joining with the resin of Example 7.
FIG. 19 shows changes when the processing speed is increased.
From FIG. 19, it was confirmed that, under the laser irradiation conditions of Example 7, the bonding strength (numerical value [unit MPa] shown in the figure) increases as the processing speed increases.

Example 8
A composite molded article of Example 8 was obtained in the same manner as Example 3. However, the metal molded body shown in FIG. 10A was made of two materials, aluminum (A5052) and stainless steel (SUS304).
Laser irradiation was performed under the following conditions.
(Laser irradiation conditions)
Laser model: J80-YHP70-106Q (LD-pumped Q-switched solid-state laser manufactured by Spectra-Physics)
Output: 11W
Wavelength: 1064nm
Pulse width: <80nsec
Frequency: 10kHz
Processing speed: 20mm / sec
Laser irradiation frequency (repetition frequency): 5 times (processing time 58 seconds)
Focal length: -2.4mm
Number of grooves: 23

FIG. 20 is a SEM photograph (200 times) of a cross section in the thickness direction of the metal molded body before being bonded to the resin of Example 8.
FIG. 20 shows a difference when the material of the metal molded body is changed.
From FIG. 20, it was confirmed that under the laser irradiation conditions of Example 8, both the opening diameter and the hole depth can be increased when aluminum is used as the metal molded body.
The numerical value (unit MPa) shown in the figure is the bonding strength between the metal molded body and the resin molded body.

DESCRIPTION OF SYMBOLS 1 Composite molded object 10 Metal molded object 12 Joint surface 20 Resin molded object

Claims (11)

A composite molded body in which a metal molded body and a resin molded body are joined,
The metal molded body has a pore group consisting of a combination of independent pores formed on the joint surface by laser light irradiation,
The pore group has a projection group formed on the surface around each opening,
A composite molded body in which the composite molded body is joined in a state in which a resin enters a pore group of the metal molded body and the projection group is embedded in the resin. The arrangement state of the pore group in the formation region of the pore group on the joint surface of the metal molded body is,
When the opening of the pore is a polygon, it is arranged so that the adjacent opening does not touch at the side, but only at the corner,
The composite molded body according to claim 1, further comprising a group of protrusions formed on a surface around each side of the polygonal opening.   The composite molded body according to claim 2, wherein the opening of the pore is a quadrangle. The arrangement state of the pore group in the formation region of the pore group on the joint surface of the metal molded body is,
When the openings of the pores are circular, the adjacent openings are arranged without contacting each other at an interval,
The composite molded body according to claim 1, further comprising a group of protrusions formed on a surface around the circular opening. A composite molded body in which a metal molded body and a resin molded body are joined,
The metal molded body has a groove group formed of a combination of independent grooves formed on the bonding surface by laser light irradiation,
The groove group has a protrusion group formed on the surfaces on both sides of each opening,
A composite molded body in which the composite molded body is joined in a state in which a resin enters a groove group included in the metal molded body and the projection group is embedded in the resin.   6. The composite according to claim 5, wherein the groove group includes a plurality of grooves formed linearly at intervals, a plurality of grooves formed curved at intervals, or a combination of them. Molded body.   The groove group is composed of a combination of a plurality of circular grooves formed at intervals, a combination of a plurality of polygonal grooves formed at intervals, or a combination of the grooves. The composite molded body according to claim 5, wherein   The composite molded body according to claim 1, wherein a joining surface of the metal molded body is a flat surface or a curved surface. A method for producing a composite molded body in which the metal molded body according to any one of claims 1 to 4 and a resin molded body are joined,
When forming a pore group by irradiating a laser beam to the joint surface of the metal molded body,
By irradiating a laser beam so that the depth of the pores formed in one scan is 10 to 200 μm, and forming pores having a cross-sectional shape of a triangle or a shape similar thereto, the opening of the pore group Forming a group of protrusions made of burrs on the surface around the part,
A composite molded body having a step of placing a portion including a joining surface of a metal molded body on which the pore group and the protrusion group are formed in a mold and molding a resin insert to be the resin molded body. Manufacturing method. A method for producing a composite molded body in which the metal molded body and the resin molded body according to any one of claims 5 to 7 are joined,
When a groove group is formed by irradiating a laser beam to the joint surface of the metal molded body,
By irradiating a laser beam so that the depth of the groove formed in one scan is 10 to 200 μm, and forming a groove having a triangular cross section or a shape close to it, both sides of the opening of the groove group Forming a bunch of burrs on the side surface;
A composite molded body comprising a step of placing a portion including a joining surface of a metal molded body on which the groove group and the protrusion group are formed in a mold and molding a resin insert to be the resin molded body. Manufacturing method.   The manufacturing method of the double after-molding body according to claim 9 or 10 whose joined surface of said metal fabrication object is a plane or a curved surface.