JP5798534B2 - Method for producing composite molded body - Google Patents

Description

  The present invention relates to a method for producing a composite molded body comprising a metal molded body and a resin molded body.

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 striped, 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.

Patent Document 4 describes a method for producing a composite molded article having a metal member and a fiber-reinforced polymer material part by performing an etching process after blasting the surface of the metal member (Embodiment). 9).
Patent Document 5 includes, as a method of manufacturing a composite member made of metal and plastic, a step of forming a surface structure so as to have a microstructure superimposed by a nanostructure using a laser having a specific pulse duration. The invention to be described is described.

Japanese Patent No. 4020957 JP 2010-167475 A JP-A-10-294024 Japanese Patent No. 4993039 Special table 2011-529404 gazette

  This invention makes it a subject to provide the manufacturing method of a composite molded object which can obtain the composite molded object which raised joint strength.

The present invention is a method for producing a composite molded body in which a metal molded body and a resin molded body are joined,
A recess having an average diameter (Ds) of the opening of 0.01 to 50 μm or a groove having an average width (Ws) of the opening of 0.01 to 50 μm is formed on the joint surface of the metal molded body with the resin molded body. First step,
The average diameter (Db) of the opening is 1.0 to 1000 μm and the average width (Wb) of the opening is 1.0 to 1000 μm with respect to the joint surface on which the recess or groove is formed. A second step of forming a groove having a maximum depth of 10 to 1000 μm;
Then, a third step of obtaining a composite molded body by placing a portion including the joint surface of the metal molded body in a mold and insert molding using a resin to be a resin molded body,
The manufacturing method of the composite molded object which has this.

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

Sectional drawing of the thickness direction of the composite molded object obtained with the manufacturing method of this invention. It is sectional drawing of the diameter direction of other embodiment obtained with the manufacturing method of this invention, (a) is the figure seen from the side surface, (b) is the figure seen from the end surface. The top view and sectional drawing for demonstrating the formation state of the recessed part formed at the 2nd process of the manufacturing method of this invention. The top view for demonstrating the formation state of the recessed part formed at the 2nd process of the manufacturing method of this invention. Sectional drawing to the thickness direction of the recessed part of FIG. The top view and sectional drawing for demonstrating the formation state of the groove | channel formed in the 2nd process of the manufacturing method of this invention. The top view for demonstrating the formation state of the groove | channel formed in the 2nd process of the manufacturing method of this invention. Sectional drawing to the thickness direction of the groove | channel of FIG. The top view for demonstrating the metal forming body used by the Example and the comparative example. The SEM photograph for demonstrating the state of the metal molded object by the process of the 1st process of Example 1. FIG. The figure for demonstrating the measuring method of the composite molded object obtained by the Example and the comparative example, and its joining strength. The SEM photograph for demonstrating the state of the metal forming body by the process of the 1st process of Example 2. FIG. The CCD photograph for demonstrating the state of the metal forming body before joining with resin of the comparative example 3. FIG. (A) is the SEM photograph (200 times) which observed FIG. 12 (a) from the cross-sectional direction, (b) is the SEM photograph (200 times) which observed FIG. 12 (b) from the cross-sectional direction, (c). Is a 500 times SEM photograph, and (d) is a 3000 times SEM photograph.

The composite molded body obtained by the production method of the present invention is, for example, as shown in FIGS.
In the composite molded body 1 of FIG. 1, a flat metal molded body 10 and a flat resin molded body 20 are bonded and integrated at a bonding surface 12.
2 (a) and 2 (b) is a composite molded body 1 in which a round bar-shaped metal molded body 10 and a round bar-shaped resin molded body 20 are joined and integrated on a joint surface 12. FIG.
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.

Hereafter, the manufacturing method of this invention is demonstrated for every process.
The present invention comprises the first, second and third steps in this order, but other steps can be added before each step as long as the problems of the present invention can be solved.
For example, before each process, the process process which cleans the joining surface of a metal molded object can be provided.

<First step>
In the first step, a recess having an average diameter (Ds) of the opening of 0.01 to 50 μm or a groove having an average width (Ws) of the opening of 0.01 to 50 μm with respect to the joint surface of the metal molded body with the resin molded body. Form.
The recess or the groove may be formed on the entire bonding surface, or may be formed on a part of the bonding surface as long as the desired bonding strength can be obtained.

When forming recesses (holes) on the joint surface of the metal molded body, the recesses (holes) having an average diameter (Ds) of the openings of 0.01 to 50 μm, preferably 0.1 to 50 μm, more preferably 1.0 to 50 μm are formed. .
Depending on the surface state of the metal molded body, there may be fine irregularities, but even in such a case, a treatment for forming the concave portion in the above range is performed. At this time, the bonding surface is more roughened and rougher than before the treatment.
Recesses can be formed such that a large number of recesses are regularly or randomly dispersed, a large number of recesses are formed in a dotted line, and straight lines, curves or figures (circles, polygons, irregular shapes, etc.) The concave portions formed so as to form a plurality of straight lines, curves, or figures can be formed so as to intersect at a plurality of locations.

When grooves are formed on the joint surface of the metal molded body, grooves having an average width (Ws) of openings of 0.01 to 50 μm, preferably 0.1 to 50 μm, and more preferably 1.0 to 50 μm are formed.
Grooves can be formed so that many grooves form straight lines, curves, or figures (circles, polygons, irregular shapes, etc.), and multiple grooves formed to form multiple lines, curves, or figures It can also be formed to intersect.
In the first step, both the recess and the groove can be formed on the joint surface of the metal molded body.

  As a processing method of the first step, a laser beam irradiation, an etching process, a pressing process, and a blasting process can be used when forming a recess, and a laser beam irradiation when forming a groove, Means selected from etching and pressing can be used.

When using the method of irradiating laser light, 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, and dye laser can be used.
The laser irradiation conditions, such as wavelength, beam diameter, pore spacing, frequency, etc., are determined depending on the type of metal molded body to be joined, the average aperture diameter (Ds) of the range or the average width of the range ( Ws) is determined so that it can be formed, but it is carried out under conditions that are milder than the case of laser irradiation in the second step. For example, although it is the same as the irradiation condition of the laser beam in the second step, the number of scans can be reduced.

For the etching process, a method in which a well-known etching solution corresponding to a metal and a masking member are used in combination can be applied.
For the press working, a method using a needle-like working tool capable of forming a concave portion of a predetermined size or a processing tool having a blade capable of forming a groove of a predetermined size can be applied.
As blasting, shot blasting, sand blasting, or the like can be used.

<Second step>
In the second step, the average diameter (Db) of the opening is 1.0 to 1000 μm and the maximum depth is 10 to 1000 μm with respect to the joint surface in which the recess or groove is formed in the first step. Grooves having an average width (Wb) of 1.0 to 1000 μm and a maximum depth of 10 to 1000 μm are formed.
When forming the recess (hole), the recess has an average diameter (Db) of the opening of 1.0 to 1000 μm, preferably 30 to 1000 μm and a maximum depth of 10 to 1000 μm, preferably 50 to 1000 μm. .
Recesses can be formed such that a large number of recesses are regularly or randomly dispersed, a large number of recesses are formed in a dotted line, and straight lines, curves or figures (circles, polygons, irregular shapes, etc.) The concave portions formed so as to form a plurality of straight lines, curves, or figures can be formed so as to intersect at a plurality of locations.

When forming a groove on the joint surface of a metal molded body, an average width (Wb) of the opening is 1.0 to 1000 μm, preferably 30 to 1000 μm, and the maximum depth is 10 to 1000 μm, preferably 50 to 1000 μm. To do.
Grooves can be formed so that many grooves form straight lines, curves, or figures (circles, polygons, irregular shapes, etc.), and multiple grooves formed to form multiple lines, curves, or figures It can also be formed to intersect.
In the second step, both the recess and the groove can be formed on the joint surface of the metal molded body.

  As a processing method in the second step, means for selecting a laser beam irradiation, a press process, a rolling process, and a cutting process can be used when forming a recess or groove. The rolling process is particularly suitable for forming grooves.

When using the method of irradiating laser light, 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, and dye laser can be used.
The laser irradiation conditions, such as wavelength, beam diameter, pore spacing, frequency, etc., are determined depending on the type of metal molded body to be joined, the average opening diameter (Db) of the range or the average width of the range ( Wb) is determined so that it can be formed. At this time, the irradiation conditions are stronger than those in the first step. For example, although it is the same as the laser light irradiation conditions in the first step, the number of scans can be increased.

The conditions for using laser light irradiation as the second step can be, for example, 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 5 to 10,000 mm / sec, and still more preferably 10 to 10,000 mm / sec.
The number of scans is preferably 1 to 20 times, and more preferably 1 to 10 times.

For the press working, a method using a needle-like working tool capable of forming a concave portion of a predetermined size or a processing tool having a blade capable of forming a groove of a predetermined size can be applied.
The rolling process is suitable as a method of processing the surface of the round bar-shaped metal molded body 10 as shown in FIG. 2, and for example, a male thread-like groove can be formed.
The cutting process is suitable as a method of processing the surface of the round bar-shaped metal molded body 10 as shown in FIG. 2 as in the rolling process, and can also be applied to a process of forming a recess.

Next, an embodiment in the second step will be described with reference to the drawings.
FIG. 3A is a plan view showing a state in which a circular recess (hole) 31 is opened in the second step, and FIG. 3B is a sectional view (depth) in the thickness direction of FIG. Direction shape).
The joining surface 12 of the metal molded body 10 is in a state in which a large number of fine holes are formed by the treatment in the first step and the surface is roughened (roughened than before the treatment). Circular holes 31 with circular openings are formed at equal intervals.
In FIG.3 (b), the shape of the depth direction of the hole 31 is a triangle.

The hole has a shape in which the shape of the opening is selected from the shapes shown in FIGS. 4 (a) to (f), and the combination in which the shape in the depth direction is obtained from the shapes shown in FIGS. 5 (a) to (c). Can be.
The shape of the opening of the hole 31 is not particularly limited. The circular shape in FIG. 4A, the ginkgo leaf shape in FIG. 4B, the boomerang shape in FIG. 4C, and the shape in FIG. It can be an ellipse, a quadrangle in FIG. 4 (e), a polygon in FIG. 4 (f), or a shape other than that illustrated.
The shape of the hole 31 in the depth direction is not particularly limited, and may be a triangle in FIG. 5A, a quadrangle in FIG. 5B, or a trapezoid in FIG. Other shapes can also be used.

FIG. 6A is a plan view showing a state in which the groove 41 is formed in the second step, and FIG. 6B is a sectional view (shape in the depth direction) in the thickness direction of FIG. Show.
The joining surface 12 of the metal molded body 10 is in a state in which a large number of fine holes are formed by the treatment in the first step and the surface is roughened (roughened than before the treatment). The grooves 41 are formed at equal intervals.
In FIG.6 (b), the shape of the depth direction of the groove | channel 41 is a triangle.

In the groove 41, the shape (planar shape) of the opening is selected from the shapes shown in FIGS. 7A to 7D, and the shapes in the depth direction are the shapes shown in FIGS. 8A to 8E. Can be a combination of those obtained from
The shape (planar shape) of the opening of the groove 41 is not particularly limited, and is a combination of straight lines in FIG. 7A and a straight line narrower in the direction perpendicular to FIG. 7B (a). 7, a combination of curves in FIG. 7C, and a combination of lattice-like straight lines in FIG. 7D, and may have shapes other than those illustrated.
The shape of the groove 41 in the depth direction is not particularly limited, and is a triangle in FIG. 8A, a quadrangle in FIG. 8B, a trapezoid in FIG. 8C, and (c) in FIG. 8D. The trapezoid in the opposite direction, the trapezoid in FIG. 8E (d) can be formed into a rounded shape, or a shape other than the illustrated one can be used.

<Third step>
In the third step, a portion including the joint surface of the metal molded body is placed in a mold, and insert molding is performed using a resin to be a resin molded body to obtain a composite molded body.
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.

Example 1
<First step>
An average of the openings by irradiating the joining surface 12 (a part of the contact surface between the actual metal molded body and the resin molded body) of the metal molded body 10 (stainless steel: SUS304) having the shape shown in FIG. By making a hole with a diameter (Ds) of 16.4 μm, the surface of the joint surface 12 was roughened by forming many irregularities.
FIG. 10A is an SEM photograph (500 times) of the bonding surface 12 before irradiation with laser light, and FIG. 10B is an SEM photograph (500 times) of the bonding surface 12 after irradiation with laser light. is there. It can be confirmed from the comparison with FIGS. 10A and 10B that the surface is roughened.
FIG.10 (c) is an enlarged photograph (1500 times) of FIG.10 (b), and it can confirm more clearly that the unevenness | corrugation is formed.

(Laser irradiation conditions)
Laser type: YVO4
Output (W): 6.0
Wavelength (nm): 1064
Pulse width (nsec): <40
Frequency (kHz): 50
Focus position (± mm): 0
Beam diameter (μm): 30
Processing speed (mm / sec): 500
Number of scans: 1

<Second step>
Next, the bonding surface 12 roughened in the first step was pressed to form holes having an average diameter (Ds) of openings of 520 μm. Electromagnetic dot marking (Izushi Co., Ltd., MULTI4) was used as the press working means.

<Third step>
As the resin, GF60% reinforced PA66 resin (Plastotron PA66-GF60-01 (L9): manufactured by Daicel Polymer Co., Ltd., glass fiber fiber length 11 mm) was used.
A surface including the joint surface 12 of the metal molded body 10 subjected to the processes of the first step and the second step was placed in a mold, and insert molded under the following conditions to obtain a composite molded body shown in FIG.
Resin temperature: 320 ° C
Mold temperature: 100 ° C
Injection molding machine: FUNAC ROBOSHOT S-2000i-100B

Example 2
<First step>
The average diameter of the openings by irradiating the joining surface 12 (part of the contact surface between the actual metal molded body and the resin molded body) of the metal molded body 10 (aluminum A5052) having the shape shown in FIG. By making a hole with (Ds) of 8.4 μm, the surface of the joint surface 12 was roughened by forming more irregularities. 12 (a) to 12 (c) are SEM photographs corresponding to FIGS. 10 (a) to 10 (c).

(Laser irradiation conditions)
Laser type: YVO4
Output (W): 6.0
Wavelength (nm): 1064
Pulse width (nsec): <40
Frequency (kHz): 50
Focus position (± mm): 0
Beam diameter (μm): 30
Processing speed (mm / sec): 500
Number of scans: 1

<Second step>
Next, the bonding surface 12 roughened in the first step was irradiated with laser light to form holes with an average diameter (Db) of the opening of 170 μm. Although it is the same as the laser beam irradiation conditions in the first step, the number of scans was set to 30. The output of the laser light irradiation conditions in the first step was lowered to 5.5 W, and the number of scans was 30.
(Laser irradiation conditions)
Laser type: YVO4
Output (W): 5.5
Wavelength (nm): 1064
Pulse width (nsec): <40
Frequency (kHz): 50
Focus position (± mm): 0
Beam diameter (μm): 30
Processing speed (mm / sec): 500
Number of scans: 30

<Third step>
In the same manner as in Example 1, a composite molded body shown in FIG. 11 was obtained.

Comparative Example 1
Only the third step was carried out without carrying out the first step and the second step of Example 2, and the composite molded body shown in FIG. 11 was obtained.

Comparative Example 2
The first step and the third step were carried out without carrying out the second step of Example 2 to obtain a composite molded body shown in FIG.

Comparative Example 3
The 2nd process and the 3rd process were implemented without implementing the 1st process of Example 1, and the compound fabrication object shown in Drawing 11 was obtained.
FIG. 13A is a CCD photograph of the joint surface after performing the same second step as in Example 1, and FIG. 13B is an enlarged photograph.

(Measuring method of average diameter)
<First step> Measuring method of average diameter (Ds) or average width (Ws) Cut the processed metal and cut the surface from the cross-sectional direction ULV-SEM (Ultra Low Acceleration Voltage Scanning Electron Microscope made by Caral ZEISS, ULTRA55) (SEM) photograph was taken at a lens magnification of 500 times (see FIGS. 14 (a) to (d)), and two lines were drawn on the photographed photograph at arbitrary positions crossing the concavo-convex part, The average diameter (Ds) and average width (Ws) were calculated by measuring the diameter and width dimensions of all openings intersecting the line. However, the number of openings (n) intersecting the line was set to 10 or more.
FIG. 14A is an SEM photograph (200 times) of the bonding surface 12 (FIG. 12A) before irradiation with laser light in Example 2 observed from the cross-sectional direction, and FIG. The SEM photograph (200 times) observed from the cross-sectional direction of the joint surface 12 (FIG. 12B) after the light irradiation, FIG. 14C is the same SEM photograph (500 times) as FIG. 14 (d) is the same SEM photograph (3000 times) as FIG. 14 (b).
From the comparison of FIGS. 14A to 14D, it can be confirmed that the surface has been roughened by the treatment in the first step.

<Second step> Measuring method of average diameter (Db) or average width (Wb) From the processed metal joint surface, using a CCD (Keyence Corporation digital microscope VHX, lens VH-Z450), lens magnification 100 An image was taken in a state where the top surface of the unevenness was in focus at a magnification (see FIG. 13A). The diameter and width dimensions of the opening in the portion in focus on the image were measured at 15 points, and the average diameter (Db) and average width (Wb) were calculated.
The diameter of the opening in FIG. 13A was drawn so as to include the longest curved part of the opening, and the diameter of the circle was measured.

[Tensile test]
Using each composite molded body of Example 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 when the metal molded body and the resin molded body were pulled in the X1 direction shown in FIG. 11 was measured with the metal molded body side fixed.
<Tensile test conditions>
Testing machine: Tensilon UCT-1T
Tensile speed: 5mm / min
Distance between chucks: 50mm

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

Claims (4)

A method for producing a composite molded body in which a metal molded body and a resin molded body are joined,
A concave portion having an average diameter (Ds) of the opening of 0.01 to 50 μm by irradiation with laser light , or an average width (Ws of opening by irradiation of laser light , on the joint surface of the metal molding with the resin molding. ) Is a first step of forming a groove of 0.01 to 50 μm,
The average diameter (Db) of the opening is 1.0 to 1000 μm with respect to the joint surface on which the recess or groove is formed, and the average diameter (Db) is larger than the average diameter (Ds) of the opening formed in the first step. ) And a recess having a maximum depth of 10 to 1000 μm, or an opening having an average width (Wb) of 1.0 to 1000 μm, which is larger than the average width (Ws) of the opening formed in the first step. A second step of forming a groove having an average width (Wb) and a maximum depth of 10 to 1000 μm;
Then, a third step of obtaining a composite molded body by placing a portion including the joint surface of the metal molded body in a mold and insert molding using a resin to be a resin molded body,
The manufacturing method of the composite molded object which has this. The first step is, which is more performed morphism irradiation of the laser beam,
The method for producing a composite molded body according to claim 1, wherein the second step is carried out by means selected from laser light irradiation, pressing, rolling, and cutting.   The manufacturing method of the composite molded object of Claim 1 or 2 whose said metal molded object is what was manufactured by the die-casting method.   The manufacturing method of the composite molded object of any one of Claims 1-3 whose joining surface with the said resin molded object of the said metal molded object is a plane or a curved surface.