JP7282531B2 - METAL PLATE, METHOD FOR MANUFACTURING METAL PLATE, METAL-RESIN COMPOSITE MOLDED PRODUCT AND METHOD FOR MANUFACTURING SAME - Google Patents

Description

TECHNICAL FIELD The present invention relates to a metal plate to be bonded to a resin, a method for manufacturing the metal plate, and a metal-resin composite molded article including the metal plate and the resin manufactured by the manufacturing method.

Metal-resin composite molded products, which are obtained by combining a metal plate made of metal, alloy, etc., and a resin molded product made of a thermoplastic resin composition, have been conventionally used for console boxes and the like around instrument panels. It is used for parts that come into contact with the outside world, such as automobile interior parts, parts around the engine, interior parts, casings of electronic devices such as digital cameras and mobile phones, interface connections, and power supply terminals.

As a method of combining a metal plate and a resin molded product, there is a method of forming fine unevenness on the joint surface of the metal plate side and joining with an anchor effect, a method of bonding using an adhesive or double-sided tape, and a method of bonding with a metal plate. There is a method of providing a fixing member such as a folding piece or a nail on the plate and/or the resin molded product, and fixing them using this fixing member, or a method of joining them using screws or the like. Among these, the method of forming minute unevenness on a metal plate and the method of using an adhesive are effective in terms of the degree of freedom in designing the metal-resin composite molded product.

In particular, the method of processing the surface of a metal plate to form minute irregularities is advantageous in that it does not use an expensive adhesive and does not require the steps of applying and curing the adhesive. As a method of processing the surface of a metal plate to form fine irregularities, for example, the method described in Patent Document 1 can be mentioned.

JP 2014-117724 A

The method described in Patent Document 1 forms grooves on the surface of a metal plate with a laser, so it is possible to form grooves in a desired range on the surface, and the work is simple, and it is one of the effective methods. .

By the way, when laser processing a metal plate, heat is generated locally at the processing point of the metal plate, and deformation due to thermal expansion of the metal plate may occur. Such deformation can be suppressed to some extent if it is a metal with a small thermal expansion or a metal plate with a shape that facilitates thermal diffusion. Since it is difficult to secure the structural strength by the rigidity of the metal plate itself, this deformation is large enough to be ignored.
Suppressing this deformation has been an issue in the case of metal plates, which are required to be thin, such as the housings of recent smartphones.

Also, when metal is rolled into a roll, such as a hoop-molded insert terminal, if the metal plate is too thick, it cannot be rolled into a roll. If the sheet is forcibly wound up, the load applied to the metal sheet at that time remains as internal strain, causing a reduction in the strength and deformation of the metal sheet, resulting in the problem of lowering the bonding strength and airtightness of the insert-molded product. Therefore, in such applications, a thin metal plate having a thickness of about 500 μm or less is required from the viewpoint of windability, and it is a problem to suppress deformation of such a thin metal plate during laser processing. was becoming

The object of the present invention is to provide a metal-resin composite that can suppress deformation due to laser processing even if the metal plate is thin, in a technology for improving the adhesion between the metal plate and resin by forming unevenness on the surface of the metal plate with a laser. It is to provide a molded product.

The present invention has been achieved by the following.
1. A metal plate having unevenness on the surface for bonding to a molded article made of a resin composition, the unevenness having a spacing Y of 0.5 to 30 μm and a depth X of 0.5 to 10 μm, defined below A metal plate having an undercut rate of 5 to 30%.
Undercut rate = (actual effective line length Rlr - Rl ₀ )/Rl ₀ × 100
However, the number of peaks n per predetermined measurement length lr in the cross section of the metal plate is (average interval SRSm of roughness elements existing within lr/lr), and a rectangle with ideal unevenness and zero undercut The effective length Rl ₀ contributing to bonding when having a cross section of is set to (ten-point average roughness Rz JIS x 2 x number of peaks n + lr), and Rlr is the actual effective line length.
2. 2. The metal plate according to 1 above, wherein the metal plate has a thickness H of 50 to 500 μm.

3. A method for producing a metal plate having unevenness on the surface for bonding to a molded article made of a resin composition, wherein the unevenness interval Y is 0.5 to 30 μm, the depth X is 0.5 to 10 μm, and the following A method for manufacturing a metal plate, having a step of forming unevenness with an undercut rate defined by 5 to 30%.
Undercut rate = (actual effective line length Rlr - Rl ₀ )/Rl ₀ × 100
However, the number of peaks n per predetermined measurement length lr in the cross section of the metal plate is (average interval SRSm of roughness elements existing within lr/lr), and a rectangle with ideal unevenness and zero undercut The effective length Rl ₀ contributing to bonding when having a cross section of is set to (ten-point average roughness Rz JIS x 2 x number of peaks n + lr), and Rlr is the actual effective line length.
4. A metal-resin composite molded product in which a molded product made of a resin composition is joined to a metal plate, wherein unevenness is formed on the surface of the metal plate into which the resin composition is inserted, and the unevenness is spaced Y is 0.5 to 30 μm, the depth X is 0.5 to 10 μm, and the undercut rate defined below is 5 to 30%.
Undercut rate = (actual effective line length Rlr - Rl ₀ )/Rl ₀ × 100
However, the number of peaks n per predetermined measurement length lr in the cross section of the metal plate is (average interval SRSm of roughness elements existing within lr/lr), and a rectangle with ideal unevenness and zero undercut The effective length Rl ₀ contributing to bonding when having a cross section of is set to (ten-point average roughness Rz JIS x 2 x number of peaks n + lr), and Rlr is the actual effective line length.
5. A method for manufacturing a metal-resin composite molded article by bonding molded articles made of a resin composition, comprising a step of forming irregularities in which the resin composition is inserted into the surface of the metal plate, wherein the step of forming irregularities comprises: A method for producing a metal-resin composite molded product, comprising a step of setting the distance Y to 0.5 to 30 μm, the depth X to 0.5 to 10 μm, and the undercut ratio defined by the following formula to 5 to 30%.
Undercut rate = (actual effective line length Rlr - Rl ₀ )/Rl ₀ × 100
However, the number of peaks n per predetermined measurement length lr in the cross section of the metal plate is (average interval SRSm of roughness elements existing within lr/lr), and a rectangle with ideal unevenness and zero undercut The effective length Rl ₀ contributing to bonding when having a cross section of is set to (ten-point average roughness Rz JIS x 2 x number of peaks n + lr), and Rlr is the actual effective line length.

In the metal-resin composite molded product of the present invention, even if the metal plate is a thin film, deformation due to laser processing is suppressed to be small.

FIG. 3 is a conceptual diagram showing a predetermined length lr of a cross section of a metal plate, an average spacing of unevenness SRSm, and the number of peaks n. FIG. 10 is a conceptual diagram showing effective length Rl ₀ in ideal unevenness with zero undercut. FIG. 4 is a conceptual diagram showing a concept of calculating an undercut rate from an actual effective line length Rlr; It is a conceptual diagram showing the test piece which measures joint strength.

Embodiments of the present invention will be described below. In addition, this invention is not limited to the following embodiment.

<Metal plate>
The metal plate of the present invention is a metal plate having unevenness on the surface for insert molding of a resin composition, the unevenness having a width Y of 0.5 to 30 μm and a depth X of 0.5 to 10 μm. , an undercut rate defined below of 5 to 30%.
Undercut rate = (actual effective line length Rlr - Rl ₀ )/Rl ₀ × 100
However, the number of peaks n per predetermined measurement length lr in the cross section of the metal plate is (average interval SRSm of roughness elements existing within lr/lr), and a rectangle with ideal unevenness and zero undercut The effective length Rl ₀ contributing to bonding when having a cross section of is set to (ten-point average roughness Rz JIS x 2 x number of peaks n + lr), and Rlr is the actual effective line length.

Examples of the metal plate used in the present invention include aluminum, magnesium, stainless steel, copper, titanium and the like. Alternatively, the metal plate may be made of a metal alloy. Moreover, the surface of the metal material may be subjected to surface treatment such as anodizing or painting. Aluminum, magnesium, copper, and titanium are preferable from the viewpoint of light weight and strength. Aluminum and copper are more preferable in applications such as terminals that require electrical conductivity, and copper is particularly preferable. Further, magnesium and titanium are preferred, and titanium is particularly preferred, in applications where thin rigidity is required, such as portable communication terminal housings.

The present invention is useful when the thickness H of the metal plate is 50 to 500 μm. The thickness H of the metal film is preferably 100 μm or more in terms of strength.

<Concave and convex shape>
In the present invention, the unevenness formed on the surface of the metal plate has an interval Y of 0.5 to 30 μm, a depth X of 0.5 to 10 μm, and an undercut rate defined below of 5 to 30%. formed as it is.
Undercut rate = (actual effective line length Rlr - Rl ₀ )/Rl ₀ × 100
However, the number of peaks n per predetermined measurement length lr in the cross section of the metal plate is (average interval SRSm of roughness elements existing within lr/lr), and a rectangle with ideal unevenness and zero undercut The effective length Rl ₀ contributing to bonding when having a cross section of is set to (ten-point average roughness Rz JIS x 2 x number of peaks n + lr), and Rlr is the actual effective line length.

If the thickness H of the metal plate exceeds 500 μm, the depth of the groove formed in the desired shape and the bonding strength are substantially correlated, and the desired bonding strength can be obtained by increasing the depth of the groove. However, when the thickness H of the metal plate is 500 μm or less, the metal plate is thin, so the metal plate is easily deformed when the groove is formed. Since the metal plate becomes thinner, it may not be possible to secure a sufficient depth of the groove while maintaining the strength of the metal plate. In the present invention, it has been found that this can be achieved by adjusting the shape of shallow unevenness.

The depth X of the unevenness and the interval Y of the unevenness in the present invention refer to the arithmetic mean roughness (RzJIS) and the average spacing of the roughness elements (SRSm) according to JIS B0601, and are taken with a scanning electron microscope. The values measured by 3D analysis using directional reflectance images are adopted. These values can be measured using, for example, a scanning electron microscope "S2700" manufactured by Hitachi Ltd. and "3D-VIEW three-dimensional model display/measurement software for Hitachi scanning electron microscope".

In the present invention, the unevenness interval Y is 0.5 to 30 μm, preferably 1.0 to 20 μm in terms of the balance between deformation and bonding strength, and more preferably 2.0 to 10 μm. . The depth X is 0.5-10 μm, preferably 1.0-8 μm, more preferably 1.5-6 μm.

<Undercut rate>
The undercut rate of the present invention was calculated based on each parameter shown in FIGS. The calculation was processed as follows. Such analysis can be performed using, for example, a scanning electron microscope "S2700" manufactured by Hitachi Ltd. and "3D-VIEW three-dimensional model display/measurement software for Hitachi scanning electron microscope".
1. Mean spacing of roughness elements within the number of crests per given measuring length lr n=lr/lr SRSm
2. The effective length Rl ₀ that contributes to the joint when the unevenness has an ideal (zero undercut) rectangular cross-section
= Ten-point average roughness Rz JIS × 2 × number of peaks n + lr
3. Undercut rate = (actual effective line length Rlr - Rl ₀ )/Rl ₀ × 100

The undercut rate of the present invention is 5 to 30%, preferably 10 to 25% in terms of the balance between deformation and bonding strength. The above undercut rate can be extracted and measured in the range of the specific unevenness interval Y, and is 5 to 30% in the area where the unevenness interval Y is 4 μm or less (for example, 3.6 μm or less). More preferably, it is 10 to 25% in the region where the unevenness interval Y is 4 μm or less, and 5 to 30% in the region where the unevenness interval Y is 3 μm or less (for example, 2.1 to 2.5 μm). and most preferably 10 to 25% in a region where the interval Y between the irregularities is 3 μm or less (for example, 2.1 to 2.5 μm).

<Method for forming unevenness and method for manufacturing metal plate>
Concavities and convexities having an undercut rate of the present invention are formed by a laser. The feature is that the entire surface is processed at the position to be joined to the resin molded product, instead of forming a groove locally. Specifically, the unevenness is formed by sublimating the metal on the joint surface by irradiating the laser. The laser irradiation conditions are appropriately set in the range of output 0.1 to 50 W, scanning speed 1 to 12000 mm/s, minimum spot diameter 20 to 80 μm, and switching frequency 0 to 400 kHz, depending on the target metal species and laser wavelength. and a laser wavelength of 300 to 1200 nm can be used.

Here, in order to form unevenness having an undercut rate of the present invention, it is effective to irradiate the entire surface to be bonded with a laser as described above, but the entire surface referred to here does not necessarily mean the area of the surface to be bonded. is not limited only to the case where 100% of is processed, and if the undercut rate of the present invention is satisfied, a part of the surfaces to be bonded may remain unprocessed (for example, 90% or more of the surfaces to be joined need only be treated). It should be noted that when the entire surface is processed, it is preferable that the processing pitch is equal to or less than the spot diameter of the focal point.

The method of laser irradiation in the present invention is to irradiate a position that has been irradiated with a laser beam once with double or triple laser beam irradiation (adjustment of the number of scans), adjust the spot diameter of the laser beam, or adjust the laser beam spot diameter. , adjusting the frequency of the laser light, and adjusting the scanning speed of the laser light. Since specific conditions vary depending on the type of metal material forming the metal plate, etc., suitable conditions are suitably adopted according to the type of metal material.

A metal plate molded into a desired shape is used according to the application. For example, a metal plate having a desired shape can be obtained by pouring molten metal or the like into a mold having a desired shape. Pressing or cutting using a machine tool or the like may also be used to form the metal plate into a desired shape.

In particular, the thin metal sheet of the present invention may be supplied to hoop forming in a rolled state. A laser beam may be irradiated to form unevenness at the stage of (2), or a metal plate on which unevenness has been formed by previously irradiating a laser beam may be wound into a roll.

A laser is used to form unevenness on the surface of the metal plate obtained as described above. The position where the unevenness is formed and the size of the range of the unevenness are determined in consideration of the position where the resin is formed.

<Resin composition>
The resin composition to be inserted into the metal plate in the present invention is not particularly limited, and thermoplastic compositions containing conventionally known thermoplastic resins can be used.

Examples of thermoplastic resins include polyethylene (PE), polypropylene (PP), polystyrene (PS), acrylonitrile/styrene resin (AS), acrylonitrile/butadiene/styrene resin (ABS), methacrylic resin (PMMA), vinyl chloride ( PVC) as thermoplastic resins (general-purpose engineering resins), for example, polyamide (PA), polyacetal (POM), ultra-high molecular weight polyethylene (UHPE), polybutylene terephthalate (PBT), GF-reinforced polyethylene terephthalate (GF-PET ), polymethylpentene (TPX), polycarbonate (PC), modified polyphenylene ether (PPE), thermoplastic resins (super engineering resins) such as polyphenylene sulfide (PPS), polyether ether ketone (PEEK), liquid crystal thermosetting resin (LCP), polytetrafluoroethylene (PTFE), polyetherimide (PEI), polyarylate (PAR), polysulfone (PSF), polyethersulfone (PES), polyamideimide (PAI) Examples of resins include phenol resins, urea resins, melamine resins, unsaturated polyesters, alkyd resins, epoxy resins, and diallyl phthalate. Examples of elastomers include thermoplastic elastomers and rubbers such as styrene/butadiene and polyolefin. , urethane, polyester, polyamide, 1,2-polybutadiene, polyvinyl chloride, and ionomer. Furthermore, thermoplastic resins to which glass fibers are added, polymer alloys, and the like can also be used.

In order to impart desired physical properties, inorganic fillers such as glass fibers, organic fillers, flame retardants, ultraviolet absorbers, heat stabilizers, light stabilizers, Additives such as colorants, mold release agents and plasticizers can be added.

Among the thermoplastic resin compositions, in order to obtain better adhesion, the melt viscosity at a shear rate of 1000 / sec measured at a temperature of 20 ° C. or higher and 30 ° C. or lower than the melting point of the thermoplastic resin is 500 Pa. · It is preferable to use a thermoplastic resin composition of s or less.

Polyacetal (POM), polyamide (PA), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polyetheretherketone (PEEK), liquid crystalline resin (LCP), polycarbonate (PC), acrylonitrile-styrene copolymer (AS), acrylonitrile-styrene-butadiene copolymer (ABS), etc. are preferred thermoplastic resins, especially polybutylene terephthalate (PBT), polyethylene terephthalate (PET), Polyphenylene sulfide (PPS) and liquid crystalline resin (LCP) are preferably used.

<Method for manufacturing metal-resin composite molded product>
The metal-resin composite molded article of the present invention comprises the above metal plate and a resin composition formed on at least part of the surface of the metal plate.
The specific steps of the method for producing the metal-resin composite molded product are not particularly limited, as long as the resin and the metal plate are combined by bringing the molten thermoplastic resin composition into close contact with the irregularities of the metal plate. good.

For example, a metal plate on which unevenness is formed is placed in a mold for injection molding, and a thermoplastic resin composition in a molten state is injected into the mold for injection molding to form a metal-resin composite of the resin and the metal plate. Methods of making molded articles are included. Conditions for injection molding are not particularly limited, and preferable conditions can be appropriately set according to the physical properties of the thermoplastic resin composition. A method using transfer molding, compression molding, or the like is also an effective method for forming a metal-resin composite molded product in which a resin and a metal plate are combined.

As another example, a resin is produced in advance by a general molding method such as injection molding, and a metal plate having irregularities formed thereon is brought into contact with the resin at a desired bonding position, and the contact surface is heated. By giving a, the vicinity of the contact surface of the resin is melted to produce a metal-resin composite molded product of the resin and the metal plate.
<Characteristics of metal-resin composite molding>

Here, since the metal-resin composite molded product of the present invention uses a thin metal plate, it can be efficiently manufactured by hoop molding that supplies this in the form of a roll. It can be suitably used for parts and their terminal holding structures.

More specifically, the metal-resin composite molded article of the present invention is useful as a part of electric/electronic equipment. Here, the electric/electronic devices include mobile video electronic devices such as smartphones, mobile phones, cameras, video composite cameras, and digital cameras, notebook computers, pocket computers, calculators, electronic notebooks, PDC, PHS, and mobile phones. portable information or communication terminals, MDs, cassette headphone stereos, radios and other portable acoustic electronic equipment, liquid crystal TVs/monitors, telephones, facsimiles, hand scanners and other household electrical appliances. Examples of electronic components that require airtightness include connectors, sensors, condensers, capacitors, batteries, and LED packages.

EXAMPLES Hereinafter, the present invention will be specifically described by showing Examples and Comparative Examples, but the present invention is not limited to these Examples.

<Manufacturing method of insert molding>
This insert molded body was manufactured by the following method. The unit of dimensions in the drawing is mm.

As a thermoplastic resin composition constituting the resin part, a polyphenylene sulfide resin composition (containing 35% by mass of glass fiber as a filler and having a melt viscosity of 260 Pa s at a shear rate of 1000 / sec measured at 310 ° C. A resin composition, "Durafide (registered trademark) 1135MF1" manufactured by Polyplastics Co., Ltd., was used.

As a metal plate, a metal plate of 18 mm × 45 mm × 1.5 mm compliant with ISO 19095 Type B, made of aluminum (A5052, thickness 1.5 mm) and having irregularities formed as follows (Fig. 4(a)) was used. This metal plate has a surface to be joined in the 5 mm×10 mm area indicated by the small hatching in FIG. 4(b).

<Formation of unevenness>
Concavities and convexities were formed on the surfaces to be joined of the metal plates (hatched portions in FIG. 4(b)) using the following various methods.
[Example 1]
Using a laser marker MD-U1000C (manufactured by Keyence Corporation, laser type: YVO ₄ laser, transmission wavelength: 355 nm (UV laser), maximum rated output: 2.5 W (average), spot diameter: 20 μm), output 90%, frequency A metal surface to be joined was irradiated with a laser beam at 50 kHz, a scanning speed of 500 mm/s, a processing pitch of 10 μm, and a scanning frequency of 10 times to form unevenness.

[Example 2]
Using a laser marker MD-V9900 (manufactured by Keyence Corporation, laser type: YVO ₄ laser, transmission wavelength: 1064 nm, maximum rated output: 13 W (average), spot diameter: 60 μm), output 99%, frequency 50 kHz, scanning speed 500 mm / s, a treatment pitch of 40 μm, and scanning times of 8 times, laser light was applied to the metal surface to be bonded to form unevenness.

[Example 3]
Using a laser marker ML-7350L (manufactured by Amada Miyachi, laser type: Yb fiber laser, transmission wavelength: 1055 to 1070 nm, maximum rated output: 50 W (average), spot diameter: 58 μm), output 90%, frequency 50 kHz, scanning speed The metal surface to be joined was irradiated with a laser beam at 1000 mm/s, a treatment pitch of 30 μm, and the number of scans was 10 times to form irregularities.

[Comparative Example 1]
Using sandpaper with a grain size of P120 specified in JIS R6010, the unevenness depth X is about 2 μm, and the unevenness interval Y is about 7 μm. bottom.

[Comparative Example 2]
Using a laser marker MD-U1000C (manufactured by Keyence Corporation, laser type: YVO ₄ laser, transmission wavelength: 355 nm (UV laser), maximum rated output: 2.5 W (average), spot diameter: 20 μm), output 38%, frequency At 50 kHz, a scanning speed of 500 mm/s, a processing pitch of 200 μm, and the number of scanning times of 40, laser light was applied to the metal surface to be bonded to form grooves in a lattice pattern.

For the metal plate subjected to each of the above treatments, each metal in each region where the depth X of the unevenness, the interval Y between the unevenness, and the interval Y between the unevenness is 2.1 to 2.5 μm and 3.3 to 3.6 μm The undercut rate of the plate was measured using a scanning electron microscope (manufactured by Hitachi, Ltd., "S2700") and "3D-VIEW three-dimensional model display/measurement software for Hitachi scanning electron microscope".

Also, using the same apparatus, the mean length RSm of the roughness curve elements was measured as another index of the surface state. Table 1 shows the measurement results of depth X, spacing Y, undercut rate, and RSm. The region of the interval Y for measuring the undercut rate can be appropriately set within the range of the uneven interval Y of the present invention. By grasping the distribution of the number of irregularities for each, it is possible to set a region in which the influence of the undercut rate can be evaluated more efficiently.

Further, as a reference, the arithmetic surface roughness (Ra), which is sometimes used as an index of the state of surface treatment when a metal plate is surface-treated for use in bonding with resin, was measured. The measurement was performed at a measurement length of 5 mm using a surface roughness meter Surftest SV3000S (stylus taper 60°, tip radius 2 μm) manufactured by Mitutoyo. Table 1 shows the results.

Each of these metal plates was placed in a mold and subjected to a compositing step. Molding conditions are as follows. The shape of the metal-resin composite molding is as shown in FIG. 4(a).
[Molding condition]
Molding machine: Sodick TR-100EH (horizontal injection molding machine)
Cylinder temperature: 320°C
Mold temperature: 150°C
Injection speed: 15mm/s
Holding pressure: 80 MPa x 5 seconds

<Evaluation>
The joint strength of the joint portion was evaluated for the metal-resin composite molded article produced by the above method. A specific evaluation method is as follows.

[Joint strength]
The bonding strength of the metal-resin composite molded body 5 produced by the above method was measured according to ISO19095. In addition, if the test piece is subjected to a tensile test as it is, a bending moment is applied to the test piece, and it may be broken below the original bonding strength. carried out. Table 1 shows the results.

[deformation]
Assuming the case of using a thin metal plate, prepare a metal plate of aluminum (A5052, thickness 0.1 mm), cut it into a plate of 20 mm × 50 mm, and apply the above Laser irradiation was performed under the same conditions as the bonding strength evaluation of each example and comparative example. The metal plates after the treatment were visually observed, and evaluated as x when deformation such as warping was observed, and as o when not. Table 1 shows the results.

As shown in Table 1, within the scope of the present invention, the bonding strength between the resin portion and the metal plate can be improved. In particular, conventionally, in the technique of roughening the surface of metal to improve adhesion with resin, it was thought that increasing the surface roughness would increase the bonding strength, but the difference between Ra and bonding strength in Table 1 There is no correlation between RSm and the bonding strength, so in the case of shallow unevenness like the present invention, the bonding strength simply depends on the surface roughness. I know it's not.

On the other hand, it was confirmed that if the undercut rate is high, excellent bonding strength can be obtained. In particular, increasing the undercut rate in the region where the unevenness interval Y is 2.1 to 2.5 μm improves the bonding strength. It can be said that it is effective for The reason for this is not clear, but it is presumed that it is due to the balance between the ease of entry of the resin due to the size of the unevenness, the absolute number of unevenness, and the anchoring effect of the undercut.

In addition, assuming the case of using for hoop molding, cut to 20 mm × 50 mm in the same manner as the above deformation evaluation, thickness 50 μm (0.05 mm), 200 μm (0.2 mm), 500 μm (0.5 mm), 1000 μm Each aluminum (A5052) metal plate with a thickness of (1 mm) was wrapped around a cylinder with a curvature radius of 40 mm and held for 10 seconds so that the longitudinal direction was the circumferential direction in the state before laser irradiation. When the surface that was outside when held was placed on a surface plate and the occurrence of warping due to strain was visually confirmed, there was no problem up to 500 μm, but significant warping was observed at 1000 μm. was taken.

As described above, if the metal plate becomes thicker, the rollability of the sheet metal used for hoop molding or the like is disadvantageous, so it is necessary to reduce the thickness of the metal plate in such applications. As shown in Table 1, metal plates can also be surface-treated with little deformation.

_lr : Predetermined measurement length Sm1, Sm2, Sm3 . Effective length Rz JIS: Ten-point average roughness of lr Rlr: Actual effective line length with undercut at lr

Claims (5)

A metal plate having unevenness on its surface for bonding to a molded article made of a resin composition, wherein the metal plate has a thickness H of 50 to 500 μm, and the unevenness has an interval Y of 0.5 to 30 μm and a depth of A metal plate for forming a hoop, having a height X of 0.5 to 10 μm and an undercut rate defined below of 5 to 30%.
Undercut rate = (actual effective line length Rlr - Rl ₀ )/Rl ₀ × 100
However, the number of peaks n per predetermined measurement length lr in the cross section of the metal plate is (average interval SRSm of roughness elements existing within lr/lr), and a rectangle with ideal unevenness and zero undercut The effective length Rl ₀ contributing to bonding when having a cross section of is set to (ten-point average roughness Rz JIS x 2 x number of peaks n + lr), and Rlr is the actual effective line length. A method for producing a metal plate having unevenness on the surface to be bonded to a molded article made of a resin composition, wherein the unevenness is formed by a laser, the interval Y of the unevenness is 0.5 to 30 μm, and the depth X is A method for producing a metal plate, comprising a step of forming unevenness with an undercut rate of 0.5 to 10 μm and an undercut rate defined below of 5 to 30%.
Undercut rate = (actual effective line length Rlr - Rl ₀ )/Rl ₀ × 100
However, the number of peaks n per predetermined measurement length lr in the cross section of the metal plate is (average interval SRSm of roughness elements existing within lr/lr), and a rectangle with ideal unevenness and zero undercut The effective length Rl ₀ contributing to bonding when having a cross section of is set to (ten-point average roughness Rz JIS x 2 x number of peaks n + lr), and Rlr is the actual effective line length. A metal-resin composite molded product in which a molded product made of a resin composition is joined to a metal plate, wherein unevenness is formed on the surface of the metal plate into which the resin composition is inserted, and the unevenness is spaced Y is 0.5 to 30 μm, the depth X is 0.5 to 10 μm, and the undercut rate defined below is 5 to 30% (however, a molded product made of a resin composition on a metal plate excluding metal-resin composite molded products that are bonded via an adhesive).
Undercut rate = (actual effective line length Rlr - Rl ₀ )/Rl ₀ × 100
However, the number of peaks n per predetermined measurement length lr in the cross section of the metal plate is (average interval SRSm of roughness elements existing within lr/lr), and a rectangle with ideal unevenness and zero undercut The effective length Rl ₀ contributing to bonding when having a cross section of is set to (ten-point average roughness Rz JIS x 2 x number of peaks n + lr), and Rlr is the actual effective line length. 4. The metal-resin composite molded article according to claim 3, wherein the metal plate has a thickness H of 50 to 500 μm. A method for manufacturing a metal-resin composite molded product by bonding a molded product made of a resin composition to a metal plate , comprising: a step of forming unevenness on the surface of the metal plate; and inserting the resin composition into the surface of the plate , and the unevenness forming step is to form the unevenness with a laser, the interval Y being 0.5 to 30 μm, and the depth X being 0.5 to 10 μm. , a method for producing a metal-resin composite molded product, which is a step of setting the undercut rate defined by the following formula to 5 to 30%.
Undercut rate = (actual effective line length Rlr - Rl ₀ )/Rl ₀ × 100
However, the number of peaks n per predetermined measurement length lr in the cross section of the metal plate is (average interval SRSm of roughness elements existing within lr/lr), and a rectangle with ideal unevenness and zero undercut The effective length Rl ₀ contributing to bonding when having a cross section of is set to (ten-point average roughness Rz JIS x 2 x number of peaks n + lr), and Rlr is the actual effective line length.

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