WO2017047127A1

WO2017047127A1 - Metallic insert member, metal-resin composite molded body, method for producing metal-resin composite molded body, and method for roughening surface of metal material

Info

Publication number: WO2017047127A1
Application number: PCT/JP2016/056577
Authority: WO
Inventors: 悟山崎; 匡徳中村; 山下　直樹
Original assignee: 日立化成株式会社
Priority date: 2015-09-15
Filing date: 2016-03-03
Publication date: 2017-03-23
Also published as: JP6103010B2; JP2017056593A

Abstract

Provided are: a metallic insert member that is capable of attaining a higher bonding strength than conventional products; and a method for roughening the surface of a metal material. According to the present invention, an annular wall part enclosing a recessed part 4 comprises an annular solidified part 31 which is created when molten metal of a metal member is solidified, wherein the annular solidified part 31 is provided with one or more wave-crest-like extending parts 34 that extend so as to reduce the size of an opening of the recessed part 4. The extending parts 34 that extend so as to reduce the size of the opening of the recessed part 4 serve as strong anchors for a resin material that has entered and solidified in the recessed part 4. One portion of the wave-crest-like extending parts 34 of one of two adjacent recessed parts 4, 4 is formed as a result of solidification of molten metal splashed from the other one of the two adjacent recessed parts.

Description

Insert metal member, metal resin composite molded body, metal resin composite molded body manufacturing method, and metal material roughening method

The present invention relates to an insert metal member having a roughened surface of a metal member, a metal resin composite molded body using the insert metal member, a manufacturing method thereof, and a method of roughening a metal material.

In Japanese Patent No. 4020957 (Patent Document 1), a laser processing method of a metal surface that forms a roughened region on the surface of a metal material by performing laser scanning processing along a plurality of scanning directions intersecting the metal surface ( (Roughening method) is disclosed. In this conventional roughening method, a plurality of intersecting grooves are formed by subjecting the surface of a metal material to laser scanning processing in a scanning direction that intersects a plurality of times in a superimposed manner. As a result, the unprocessed portion remains as a plurality of convex shapes. In FIGS. 11 to 13 of Patent Document 1, photographs showing a plurality of uneven shapes are shown. As is apparent from these photographs, the uneven shape appearing on the surface of the metal material formed by the conventional method is a mountain-shaped convex portion that gently spreads from the apex, and the width dimension decreases from the opening to the back. It becomes a mortar-shaped recess. Although small irregularities are observed on the surface of the convex part and the concave part, the height of the convex part is small as compared with the size of the opening of the concave part. Also, in this publication, an insert metal material made of aluminum, magnesium or stainless steel roughened by using the roughening method shown in the publication is used as an insert, and various resin materials containing polyacetal as a resin material. It is disclosed that a metal resin composite molded body is manufactured by insert molding using the same.

Japanese Patent No. 4020957

Patent Document 1 describes a resin material having poor bondability to a metal material such as polyacetal as a resin material, and stainless steel having a high laser beam reflectivity as a metal material. However, when these materials are used to produce a metal resin composite molded body using the technique disclosed in Patent Document 1, sufficient bonding strength between the metal material and the resin material and airtightness at the bonding surface can be obtained. Turned out not to.

An object of the present invention is to provide an insert metal member and a surface roughening method for a metal material, which can obtain higher bonding strength than before.

In addition to the above object, another object of the present invention is to provide an insert metal member and a surface roughening method for a metal material, which can be more airtight than conventional ones.

Still another object of the present invention is to provide a metal resin composite molded body having higher joint strength and airtightness than the conventional one and a method for producing the metal resin composite molded body.

The present invention is directed to an insert metal member for a metal-resin composite molded body in which a resin member is molded in a roughened region in which a plurality of recessed portions are formed on the surface of a metal member having a predetermined shape. In the insert metal member of the present invention, the annular wall portion surrounding the recessed portion is composed of an annular solidified portion generated in a state where the molten metal of the metal member is solidified, and the annular solidified portion narrows the opening of the recessed portion. One or more crest-shaped extending portions are provided. The crest-like extending portion that extends so as to narrow the opening of the recessed portion becomes a strong anchor against the resin material that has solidified by entering the recessed portion. Therefore, the bonding strength of the resin material to the insert metal member can be greatly improved as compared with the conventional case. “Wave-shaped” means a shape similar to the shape of a wave that breaks down.

Included in the plurality of recesses are those in which a partition between two adjacent recesses is constituted by a part of two adjacent annular solidification portions. In this case, a crest-like extending portion exists in the vicinity of the partition wall portion. The partition wall is made of a molten metal solidified and has a complicated shape. And the molten metal scattered matter adheres to the partition wall periphery. Therefore, there is a high probability that a crest-like extension portion is formed in the vicinity of the partition wall portion, and this crest-like extension portion exhibits the effect as an anchor most.

A part of the crest-like extension part of one of the two adjacent concave parts is formed by solidification of molten metal scattered from the other concave part side of the two adjacent concave parts. Has been. As a result, a large extending portion extending so as to narrow the opening of the recessed portion is formed.

In addition, a communicating cave that communicates between two adjacent recessed portions may be formed in the partition wall. If there is such a continuous cave, the resin material that has entered and solidified inside the continuous cave will be a strong anchor unless it escapes from the continuous cave. In the present specification, a continuous cave is an irregularly shaped void such as a cave formed in a solidified portion when a solidified portion is formed between at least two adjacent concave portions. means. In the insert metal member of the present invention, when resin for forming a resin member enters and solidifies in one or more continuous caverns formed in a solidified portion located between at least two adjacent concave portions, there is no conventional Strong anchor effect occurs. As a result, the bonding strength of the resin material to the insert metal member can be greatly improved as compared with the conventional case. In a plurality of recesses, even in two adjacent recesses, if the distance between the recesses is separated or the formation time of the recess is separated, a communication cave is not formed in the solidified part between the two adjacent recesses. Even if things are included, it is natural that the anchor effect will increase as long as a continuous cavern is formed. Therefore, the present invention does not include only the case where a continuous cavern is formed between all two adjacent recesses.

The average diameter dimension of the plurality of recesses is 40 μm or more and 100 μm or less, the average depth dimension of the plurality of recesses is 100 μm or more, and the distance between the centers of two adjacent recesses is 50 μm or more and 80 μm or less. If it does in this way, the joint strength with respect to the insert metal member of a resin material can be improved rather than before. In addition, the dimension of each part enlarges the surface and cross section of the insert metal member actually manufactured with the scanning electron microscope (SEM), the image is taken, the planar image of the several recessed part formed per unit area, and It measured based on the cross-sectional image and calculated | required as the average value.

As a metal member, copper, copper alloy, brass, plated copper plated with copper, plated copper alloy plated with copper alloy, or plated brass plated with brass, with reflectivity Even if a material made of a high metal is used, according to the present invention, it is possible to obtain a higher bonding strength than before.

To roughen the surface of the insert metal member, the surface of the metal member having a predetermined shape is irradiated with laser light having a predetermined spot diameter, thereby forming a plurality of concave portions on the surface to form a roughened region. A roughening method of the metal material to be formed can be used. In the roughening method of the present invention, the first step is to first form a molten metal by irradiating a metal member with a laser beam, and forming the above-mentioned recessed portion by an annular solidified portion formed by solidifying the molten metal. carry out. Next, before the annular solidified portion of the previous concave portion is completely solidified, the metal member is irradiated with laser light at a predetermined distance from the previous concave portion to generate the next molten metal, and the next melting A second step of forming the next recessed portion by the next annular solidified portion formed by solidifying the metal is performed. The roughened region is formed by repeating the first step and the second step. In the present invention, the laser beam power, the spot diameter, and the irradiation pattern are solidified by adhering and solidifying a part of the next molten metal on the molten metal to form the previous recessed portion. It is determined that one or more crest-like extending portions extending so as to narrow the opening of the recessed portion are formed. In the present specification, the “irradiation pattern” includes the number of times of laser light irradiation and the laser light irradiation conditions including the irradiation path. Therefore, depending on the irradiation pattern, the above-described extension portion may be formed by one-time laser light irradiation, or the above-mentioned extension portion may be formed by a plurality of laser light irradiations. For example, when the power of the laser beam is small, the laser beam is irradiated to a plurality of irradiation positions so that the spots of the laser beam overlap along the closed loop irradiation path pattern in order to form one concave portion. This makes it possible to generate a wave-shaped extension. In the specification of the present application, the “closed loop irradiation path pattern” is a pattern in which, for example, a laser beam irradiation path (or laser beam irradiation locus) is a closed shape such as a circle, an ellipse, or a polygon. Means. This pattern may be a beautiful pattern or a slightly disturbed pattern such as handwriting. If the irradiation path pattern is a closed loop shape, not only can a concave portion with a complicated depth and a complicated inner wall shape be formed at the center of the irradiation path pattern, but also the operation of the apparatus for irradiating laser light can be made smooth. Can be. When the laser beam is irradiated so that the laser beam spots overlap along the irradiation path pattern, the molten metal melted by the laser beam irradiation is pushed out of the spot or scattered around and solidified. As a result, a complex-shaped wavefront-like extension part is formed in the opening part and the inner wall part of the recessed part.

In addition, the partition wall between the first recess and the next recess is formed by a part of two adjacent annular solidification portions, and the wave front-shaped extension is present in the vicinity of the partition wall. The light power, spot diameter and irradiation pattern are determined. In this way, the energy generated when forming the adjacent recesses deforms the partition wall to the previously formed recess, and the scattered molten metal also adheres to the opening periphery of the recess previously formed. Therefore, a larger crest-like extension part can be formed. Therefore, the anchor effect can be further enhanced.

Further, the power of the laser beam, the spot diameter, the irradiation pattern, and the center of the two recesses are formed so that a continuous cavern connecting the two recesses is formed in the partition wall between the two recesses formed continuously. It is preferable to define an interval between them. In order to form both concave portions in a solidified portion formed between two adjacent concave portions when another concave portion is formed adjacently after one concave portion is formed. The energy from the irradiated laser light influences each other, and there is a high possibility that a continuous cave communicating between both concave portions is formed. Although the mechanism by which a continuous cavern is formed is not certain, it has been confirmed by experiments that it is formed with a certain degree of reproducibility.

Specifically, when the average diameter dimension of the plurality of recesses is 40 μm or more and 100 μm or less and the average depth dimension of the plurality of recesses is 100 μm or more, the distance between the centers of two adjacent recesses However, it is preferable to determine the power of the laser beam, the spot diameter, the irradiation pattern, and the distance between the centers of the two recesses so as to be 50 μm or more and 80 μm or less.

The more practical conditions for carrying out the method of the present invention are as follows.

The metal member of the predetermined shape is copper, copper alloy, brass, plated copper plated with copper, plated copper alloy plated with copper alloy, or plated brass plated with brass, laser The light power is set to 24 W to 80 W, the wavelength is set to 1054 nm to 1074 nm, the spot diameter of the laser light is set to 45 μm to 75 μm, the irradiation path pattern is a circular pattern having a diameter of 25 μm to 40 μm, and pulsed along the irradiation path pattern. A recess is formed by irradiating a laser beam on the surface. Then, the distance between the centers of two concave portions formed continuously is set to 50 to 60 μm. Under such conditions, the resin member can be insert-molded using a material made of a metal having a high laser beam reflectivity, such as copper, which has been impossible in the past, as an insert.

According to the present invention, copper, copper alloy, brass, plated copper plated with copper, plated copper alloy plated with copper alloy, or plated brass plated with brass are used as the metal member. In the metal-resin composite molded body in which the insert metal member of the present invention used is an insert and the resin member is insert-molded with polyacetal or polyphthalamide, a bonding strength that cannot be obtained by the conventional technique is obtained.

In the method for producing a metal-resin composite molded body of the present invention, insert molding is performed by setting the insert metal member of the present invention to a molding temperature of the resin material or a temperature close to the molding temperature. In this way, the resin material does not start to solidify or solidify until the resin portion is completely filled in the recessed portion, so that the resin material can be completely filled and solidified in the recessed portion, and the bonding strength and airtightness can be improved. It can be sufficient.

(A) is a perspective view of an example of an embodiment for testing an insert metal member of the present invention, (B) is a perspective view showing a resin member formed by inserting an insert metal member alone, (C) is a perspective view of a metal-resin composite molded body in which a resin member is formed by inserting an insert metal member. (A) is an enlarged plane image of an actual example of a roughened roughened region, and (B) to (D) are SEM images obtained by photographing the roughened region from an oblique direction using a scanning electron microscope. is there. (A) is an enlarged plane image of an actual example of a roughened roughened region, and (B) to (D) are SEM images obtained by photographing the roughened region from an oblique direction using a scanning electron microscope. is there. (A) is an enlarged plane image of an actual example of a roughened roughened region, and (B) to (D) are SEM images obtained by photographing the roughened region from an oblique direction using a scanning electron microscope. is there. (A) is an enlarged plane image of an actual example of a roughened roughened region, and (B) to (D) are SEM images obtained by photographing the roughened region from an oblique direction using a scanning electron microscope. is there. (A) is a schematic plan view showing an example of the contour shape around the opening of the recessed portion, and (B) is a schematic partial cross-sectional view of two recessed portions adjacent to each other with a thermally affecting distance. It is a figure for demonstrating an irradiation route pattern. It is a figure used in order to explain laser equipment. It is a figure used in order to explain evaluation conditions. (A) thru | or (F) has shown the example of sectional drawing after resin filling of the Example which used the brass which gave the tin suspension plating as a metal material, and used the polyacetal (POM) as a resin material. It is a figure which shows the test result of the Example of a metal resin composite molded object produced using the insert metal member which roughened the surface by the method of this invention, and a comparative example. In (A) and (B), the distance between the centers of the recesses is set to 60 μm by a method of irradiating a plurality of irradiation positions with laser light so that the laser light spots overlap along a closed loop irradiation path pattern. They are an expanded sectional view and a further expanded sectional view of an insert metal member at the time of forming a concave part continuously. In (A) and (B), the distance between the centers of the recesses is set to 100 μm by a method of irradiating a plurality of irradiation positions with laser light so that the laser light spots overlap along a closed loop irradiation path pattern. It is the expanded sectional view and further expanded sectional view of an insert metal member at the time of forming a recessed part continuously.

Hereinafter, an embodiment of an insert metal member of the present invention, a metal resin composite molded body using the insert metal member, and a method of roughening a metal material will be described in detail with reference to the accompanying drawings. FIG. 1A is a perspective view of an example of an embodiment for testing an insert metal member of the present invention. The insert metal member 1 of this embodiment includes a roughened region 5 in which a large number of recessed portions 4 are formed on the surface of a plate-like metal member 3. Examples of the metal member 3 include copper, copper alloy, brass, tin-plated copper plated with copper, plated copper alloy plated with copper alloy, or plated brass plated with brass. A metal made of a metal having high reflectivity with respect to the laser beam is used. Of course, the present invention may be applied to an insert metal member made of a metal having low reflectivity with respect to laser light such as aluminum.

FIG. 1 (B) is a perspective view independently showing a resin member 7 formed by inserting the insert metal member 1. A test pipe 9 is integrally formed on the resin member 7. FIG. 1C shows a perspective view of a metal-resin composite molded body 11 in which the insert metal member 1 is inserted and the resin member 7 is formed.

The test pipe 9 has a structure in which a part of the roughened region 5 is exposed to the inside of the pipe 9 for an airtightness test. The presence or absence of airtightness is confirmed by whether or not bubbles are generated from the interface between the roughened region 5 and the resin member 7 when gas is supplied from the pipe 9. In addition, the pipe 9 has a resin member 7 when a predetermined pulling force is applied to the pipe 9 in a direction away from the insert metal member 1 (a direction perpendicular to the roughened region 5) while the insert metal member 1 is fixed. Is provided to measure the bonding strength depending on whether or not the roughened region 5 is partially or completely peeled off.

Various thermoplastic resin materials can be used as the resin material used for forming the resin member 7 that is insert-molded using the insert metal member 1 as an insert. In this embodiment, in particular, polyacetal (POM) is used. Alternatively, polyphthalamide (PPA) is used. These resin materials are resin materials in which it is difficult to increase the bonding strength with the insert metal member made of a metal material having a high reflectance, and it is difficult to increase the airtightness of the bonding portion.

As will be described in detail later, the surface of the insert metal member 1 is roughened by irradiating the surface of the metal member having a predetermined shape with a laser beam having a predetermined spot diameter, thereby forming a plurality of recessed portions 4 (FIG. 2). (See FIG. 6) is formed on the surface to form the roughened region 5 having a plurality of wave-shaped extensions 34. The roughening method of the present invention will be described later.

FIG. 2 (A) shows an enlarged plan view of an actual example of the roughened region 5 of the insert metal member roughened by the roughening method of the present embodiment. In this actual example, a pulsed laser beam having a power of 64 W, a wavelength of 1064 nm, and a spot diameter of 45 μm is irradiated along a circular pattern irradiation path pattern having a diameter of 30 μm, which will be described later, onto a metal member made of brass. Then, the step of forming one concave portion 4 and the step of forming the next concave portion so that the distance between the centers of the concave portion to be formed next and the previously formed concave portion is 60 μm are repeatedly performed. The surface of the metal member is roughened by a plurality of recessed portions 4 and a plurality of wave-shaped extending portions 34. The magnification of this photograph is 70 times. 2B to 2D are SEM images obtained by photographing the roughened region 5 from an oblique direction using a scanning electron microscope (SEM). 2B is a magnification of 250 times, and FIGS. 2C and 2D are images of a magnification of 700 times taken at different positions.

FIG. 3A shows an enlarged plan view of another actual example of the roughened region 5 of the insert metal member roughened by the roughening method of the present embodiment. In this actual example, a metal member made of brass is irradiated with a pulsed laser beam having a power of 64 W, a wavelength of 1064 nm, and a spot diameter of 45 μm along a circular pattern irradiation path pattern having a diameter of 40 μm, which will be described later. Then, the step of forming one concave portion 4 and the step of forming the next concave portion so that the distance between the centers of the concave portion to be formed next and the previously formed concave portion is 70 μm are repeatedly performed. The surface of the metal member is roughened by a plurality of recessed portions 4 and a plurality of wave-shaped extending portions 34. The magnification of this photograph is 70 times. 3B to 3D are SEM images obtained by photographing the roughened region 5 from an oblique direction using a scanning electron microscope (SEM). 3B is a magnification of 250 times, and FIGS. 3C and 3D are images of a magnification of 700 times taken at different positions.

FIG. 4A shows an enlarged plan view of another actual example of the roughened region 5 of the insert metal member roughened by the roughening method of the present embodiment. In this actual example, a metal member made of brass is irradiated with a pulsed laser beam having a power of 64 W, a wavelength of 1064 nm, and a spot diameter of 45 μm along an irradiation path pattern of a circular pattern having a diameter of 60 μm, which will be described later. Then, the step of forming one concave portion 4 and the step of forming the next concave portion so that the distance between the centers of the concave portion to be formed next and the previously formed concave portion is 80 μm are repeatedly performed. The surface of the metal member is roughened by a plurality of recessed portions 4 and a plurality of wave-shaped extending portions 34. The magnification of this photograph is 70 times. 4B to 4D are SEM images obtained by photographing the roughened region 5 from an oblique direction using a scanning electron microscope (SEM). 4B is a magnification of 250 times, and FIGS. 4C and 4D are images of a magnification of 700 times taken at different positions.

FIG. 5A shows an enlarged plan view of another actual example of the roughened region 5 of the insert metal member roughened by the roughening method of the present embodiment. In this actual example, a pulsed laser beam having a power of 64 W, a wavelength of 1064 nm and a spot diameter of 45 μm is irradiated along a circular pattern irradiation path pattern having a diameter of 80 μm, which will be described later, onto a metal member made of brass. Then, the step of forming one concave portion 4 and the step of forming the next concave portion so that the distance between the centers of the concave portion to be formed next and the concave portion formed previously is 100 μm are repeatedly performed. The surface of the metal member is roughened by a plurality of recessed portions 4 and a plurality of wave-shaped extending portions 34. The magnification of this photograph is 70 times. 5B to 5D are SEM images obtained by photographing the roughened region 5 from an oblique direction using a scanning electron microscope (SEM). 5B is a magnification of 250 times, and FIGS. 5C and 5D are images of a magnification of 700 times taken at different positions.

FIG. 6 (A) is a schematic plan view showing an example of the contour shape around the opening of the recessed portion 4, and FIG. 6 (B) shows the two recessed portions 4 adjacent to each other with a thermally affected distance. It is a model fragmentary sectional view. As can be seen from FIGS. 2 to 6, the insert metal member according to the embodiment of the present invention includes an annular solidified portion 31 formed in a state where the annular wall portion surrounding the recessed portion is solidified of the molten metal of the metal member. The annular solidified portion 31 includes one or more wave-head-like extending portions 34 that extend so as to narrow the opening of the recessed portion 4. Since the shape of the wave-shaped extension 34 is complicated, it is difficult to accurately specify the wave-shaped extension 34 by a numerical value. In addition, the shape and size of the wave-shaped extension 34 varies depending on the type of metal material, the power of the laser beam, the wavelength, the spot diameter, and the irradiation path pattern. However, it has been confirmed that most of the length of the crest-like extension 34 extending to the opening side of the recess 4 measured by the inventor based on the enlarged photograph falls within the range of 10 μm to 30 μm. ing.

The crest-like extended portion 34 extending so as to narrow the opening of the recessed portion 4 serves as a strong anchor for the resin material that has entered the recessed portion 4 and solidified. A part of the crest-like extension part 34 included in one of the two adjacent recessed

parts

4, 4 is a molten metal scattered from the other recessed part side of the two adjacent recessed parts. Is formed by solidification. The plurality of recessed portions 4 include a structure in which a partition wall portion 32 between two adjacent recessed

portions

4, 4 is constituted by a part of two adjacent annular solidified portions 31. In the vicinity of the partition wall 32, a wave-shaped extension 34 exists. The partition wall 32 is made of a molten metal solidified and has a complicated shape. Then, molten metal scattered matter adheres around the partition wall 32. For this reason, there is a high probability that the crest-shaped extension portion 34 is formed in the vicinity of the partition wall portion 32, and this crest-shaped extension portion 34 exhibits the effect as an anchor most.

In addition, as schematically shown in FIG. 6B, when the distance between at least two adjacent recessed

portions

4 and 4 is short, a partition wall portion located between the two adjacent recessed

portions

4 and 4 is formed. In some cases, one or more continuous caverns 33 may be formed in a part of the annular solidified portion 31. The

recesses

4 and 4 adjacent to each other are communicated with each other through the communication cave 33. The continuous cave 33 is an indeterminate complex shape such as a cave formed in the annular solidified portion 31 when the annular solidified portion 31 located between at least two adjacent recessed

portions

4 and 4 is formed. It is a void with a gap. The example of FIG. 6B is an example, and the actual communication cave 33 has a complicated three-dimensional shape like the inner wall of a lava cave, and a plurality of communication cave 33 communicate with each other. It is also included. Since such a continuous cavern 33 is formed in the annular solidified portion 31, when a resin for forming a resin member enters the solid cavern 33 and solidifies, an unprecedented strong anchor effect occurs. In addition, it is not necessary for all of the plurality of recessed portions to have a continuous cave formed between other adjacent recessed portions, and if a continuous cave 33 is formed between some of the plurality of recessed portions, The anchor effect by the continuous cavern 33 is enhanced as compared with the case where only the extension 34 is formed. Usually, a communication cave is formed between two concave portions formed continuously in distance and in time.

[Embodiment of roughening method]
In one embodiment of the roughening method of the present invention, the surface of the insert metal member 1 is roughened as follows. First, a plurality of recessed portions 4 are formed by irradiating the surface of a metal member having a predetermined shape with pulsed laser light having a predetermined power, wavelength, and spot diameter suitable for the material of the metal member according to a predetermined irradiation pattern. Is used to form a roughened region 5 by forming a roughened region 5 on the surface. In the roughening method according to the embodiment of the present invention, first, a metal member is irradiated with laser light to generate molten metal, and the concave portion 4 is formed by an annular solidified portion 31 formed by solidifying the molten metal. The 1st process to form is implemented. Next, before the annular solidified portion 31 of the previous recessed portion 4 is completely solidified, the metal member is irradiated with laser light at a predetermined distance from the previous recessed portion to generate the next molten metal. A second step of forming the next recessed portion 4 by the next annular solidified portion 31 formed by solidifying the molten metal is performed. The roughened region 5 is formed by repeating the first step and the second step. In the present invention, the laser beam power, the spot diameter, and the irradiation pattern are solidified by adhering and solidifying a part of the next molten metal on the molten metal to form the previous recessed portion. It is determined that one or more crest-shaped extending portions 34 extending so as to narrow the opening of the recessed portion 4 are formed. As described above, the “irradiation pattern” includes the number of times of laser light irradiation and the laser light irradiation conditions including the irradiation path. Therefore, depending on the irradiation pattern, the extending portion 34 may be formed by one laser light irradiation, or the extending portion 34 may be formed by a plurality of laser light irradiations.

For example, when the power of the laser beam is small, by irradiating a plurality of irradiation positions PS with the laser beam so that the spots of the laser beam overlap along a closed loop irradiation path pattern PT as shown in FIG. The extension part 34 can be generated. In the example of FIG. 7, eight laser irradiation positions PS are used, but the number of laser irradiation positions PS is arbitrarily determined according to the size of the spot diameter SR of the laser light. As shown in FIG. 8, the laser light emitted from the laser equipment 13 used in the present embodiment has a wavelength in the range of 1054 nm to 1074 nm (in this embodiment, 1064 nm) and a power of 24 W to 80 W (this In the embodiment, 64 W), the preferred range of the spot diameter is 45 μm to 75 μm (45 μm in this embodiment), and the focal length is 80 mm. Then, as shown in FIG. 9, the laser beam L is scanned along the irradiation path pattern PT having a diameter of 30 μm, and the center-to-center distance between the next formed recess and the previously formed recess is 50 μm to 80 μm. . The center of the spot diameter of the laser beam L is matched with the laser irradiation position PS and the laser beam is irradiated. The preferable range of the period for irradiating the pulsed laser beam is 5 μs to 10 μs (10 μs in this embodiment), and the laser beam is scanned only once in the clockwise or counterclockwise direction along the irradiation path pattern PT. A preferable speed range is 100 mm / s to 1500 mm / s (900 mm / s in this embodiment). In this way, the diameter of the outer circumference of the laser locus that can be obtained as a result of scanning the laser beam L along the irradiation path pattern PT is theoretically 75 μm.

In the example of FIG. 9, the distance between the centers of two adjacent concave portions is 90 μm, and the thermal influence between the two adjacent concave portions is small. When the distance between the centers of the two concave portions is smaller than 75 μm, the annular solidified portions constituting the two adjacent concave portions are formed in a partially overlapping state, and the two concave portions are adjacent to each other. A partition is comprised only by the solidification part of a molten metal.

As described above, when the laser beam is sequentially irradiated onto the laser irradiation position PS, a part of the metal member 3 is melted and the molten metal is scattered, and the scattered molten metal adheres along the opening of the recess 4. The deposit formed in this way is solidified to form the annular solidified portion 31. The shape of the annular solidified part 31 surrounding one recessed part 4 is not constant.

The next recessed portion 4 formed at a position adjacent to the previously formed recessed portion 4 is formed with a distance from the previous recessed portion 4 that is affected by the thermal effect of the previously formed recessed portion 4. It is preferable to do this. When the recess 4 is formed so that the distance between the centers of two adjacent recesses is 50 μm or more and 80 μm or less, the average diameter of the plurality of recesses 4 to be formed is 70 μm or more and 100 μm or less. The average depth dimension of the part 4 is 100 μm or more.

As schematically shown in FIG. 6B, the annular solidified portion 31 that forms the recessed portion 4 includes one or more extending portions 34 that bulge into the recessed portion 4 on the inner wall surface of the recessed portion 4. ing. The length of the portion of the extending portion 34 that follows the opening edge of the recessed portion 4 is 1/10 or more of the average circumferential length of the opening edge of the recessed portion 4. Further, as described above, a communication cave 33 is formed in the annular solidified portion 31 between at least two recessed

portions

4 and 4 that are adjacent to each other and have a thermal relationship with each other. In addition, about the shape of the extension part 34 extended in the recessed part 4, and the continuous cavern 33, a cross-sectional photograph is shown and demonstrated in the Example and comparative example which are demonstrated later.

When such a communication cave 33 and the extension part 34 are formed, when the resin material for forming the resin member 7 enters the inside of the recessed part 4 and solidifies, the communication cave 33 and the extension part 34 are formed. Acts as a strong anchor for the solidified resin material. Therefore, the joining strength of the resin member 7 to the insert metal member 1 can be improved as compared with the conventional case.

In the roughening method of the present embodiment, the step of forming the concave portion 4 is performed along the surface of the metal member 3 at a distance that affects the influence of heat given by the laser light irradiation. The roughened region 5 is formed by forming a plurality of recessed portions 4 by performing.

[Metal resin composite molded body and method for producing the same]
By forming the resin member 7 by insert molding (in this embodiment, injection molding) using a predetermined resin material with the insert metal member 1 manufactured as described above as an insert, FIG. The metal resin composite molded body 11 shown is manufactured. In particular, this embodiment is suitable for a case where a metal member having a predetermined shape is made of copper or brass that has a high reflectance when the laser wavelength is 1064 nm or more and is plated with tin. Such a metal material having a high reflectance is a material whose surface is difficult to be roughened by laser irradiation. As the resin material, polyacetal (POM) or polyphthalamide (PPA) is used. These resin materials are resin materials in which it is difficult to increase the bonding strength with the insert metal member made of a metal material having a high reflectance, and it is difficult to increase the airtightness of the bonding portion.

In particular, in the method for producing a metal-resin composite molded body of the present embodiment, the insert metal member 1 is heated (preheated) to a molding temperature of the resin material or a temperature close to the molding temperature (220 ° C. in the present embodiment). Insert molding is performed by the above. Thus, since the resin material does not start to be solidified until the recess 4 is completely filled with the resin material, the recess 4 can be completely filled with the resin material, and the bonding strength and airtightness can be improved. It can be sufficient.

FIGS. 10A to 10F use brass (C2680P-1 / 2H) plated with tin as a metal material, and Polyplastic Company name “Duracon (registered trademark) M90-44” as a resin material. The example of sectional drawing after resin filling of the Example (dot pattern) using the polyacetal (POM) marketed in is shown. The dot pattern is formed by irradiating a laser beam to the laser irradiation position PS determined along the irradiation path pattern PT employed in the roughening method to form one concave portion, and arranging a plurality of the concave portions. Is formed. 10A to 10F are obtained by cutting a dot pattern filled with resin so as to include a plurality of recessed portions. However, since the shape of the recessed portion is not constant and the size of the recessed portion is extremely small, it is difficult to cut at a desired position. Therefore, in some of the cross-sectional views of FIGS. 10A to 10F, there is a cross section passing through the vicinity of the center of the recessed portion [FIG. 10F], but there is a slight deviation from the vicinity of the center of the recessed portion. Some have a cut surface passing through the position [FIGS. 10A, 10B, and 10E], while others have a cut surface passing through the end of the recess [FIGS. D)] is also included. From these figures, the internal shape of the recessed portion is complicated, the communication cave 33 is formed between two adjacent recessed portions, and a part of the solidified portion that has melted and solidified at the entrance portion of the recessed portion. It can be seen that the extension 34 is present in a complicated shape. In this example, an unprecedented joint strength is obtained by the anchor effect by the continuous cavern 33 in addition to the anchor effect by the extension 34.

[Examples and comparative examples of metal resin composite molded bodies]
FIG. 11 shows an example and a comparative example of a metal-resin composite molded body made using an insert metal member whose surface was roughened by the method of the present invention (the surface roughened by the hatching pattern of Japanese Patent No. 4020957). The test result of the metal-resin composite molded object made using the insert metal member which carried out the conversion is shown. In the example, the test was performed when the preheat was “present” and “none”, and in the comparative example, the test was performed only when the preheat was “not present”. The number of test samples was five. Then, an average value “AVE” was obtained.

The test results shown in FIG. 11 show that the metal material is brass that has not been plated and copper that has not been plated (DSC-3N-1 / 2H). Test results of examples and comparative examples using polyphthalamide (PPA) sold under the name and polyacetal (POM) sold under the name Duracon (registered trademark) M90-44 by Polyplastics as the resin material It is. These tests were conducted at a laser processing pitch of 60 μm. The laser processing pitch indicates the distance (pitch) between the centers of adjacent grooves formed in a straight line in the comparative example, and in the example, means the distance between the centers of two adjacent recesses. To do. In the example, the distance between the centers of two adjacent concave portions was set to 60 μm.

“Tensile strength” is 20 mm in a direction away from the insert metal member 1 to the pipe 9 (direction perpendicular to the roughened region 5) in a state where the insert metal member 1 is fixed using a tensile tester (autograph). The tensile strength when the resin member 7 was partially or wholly peeled from the roughened region 5 was measured as “strength”. From this test result, it can be seen that polyacetal (POM), for which it is difficult to increase the bonding strength with respect to brass, has a strength nearly four times that of the comparative example even without preheating. Further, it can be seen that, as with brass, it is difficult to increase the bonding strength, and even when there is no preheating, a strength nearly 1.5 times that of the comparative example can be obtained. In addition, the tensile strength of the preheat “Yes” in the example is not a result of the resin member 7 being peeled from the roughened region 5 but a material destruction of the resin member 7 itself.

Further, by supplying gas from the pipe 9 at a pressure of 0.4 Mpa, whether or not bubbles emerge from the interface between the roughened region 5 and the resin member 7 of the metal resin composite molded body submerged in water, In the test for confirming the presence or absence of airtightness, in the example using polyacetal (POM), it is confirmed that if preheating is not performed, airtightness cannot be secured, but if preheating is performed, complete airtightness can be obtained. It was done. Further, in the examples using polyphthalamide (PPA), even when preheating is not performed, a certain airtightness can be secured (3 out of 5 test samples have airtightness). If preheating is performed, complete airtightness is achieved. It was confirmed that the property can be obtained. In the comparative example, it was confirmed that airtightness could not be ensured when preheating was not performed in either case of using polyacetal (POM) or polyphthalamide (PPA). In addition, in the comparative example, when preheating was performed, it was also confirmed that a certain hermeticity could be secured when polyphthalamide (PPA) was used (two out of five test samples were airtight).

[Test on thermal effect between recesses]
When the recessed portion 4 is formed by irradiating the plurality of irradiation positions PS with the laser beam so that the laser beam spots overlap along the closed-loop irradiation path pattern PT, when the laser beam power is about 64 W By testing, it is confirmed that if the distance between two adjacent concave parts of a plurality of concave parts formed in succession becomes longer, the thermal effect between the concave parts disappears, and the desired extension part cannot be formed. did. FIGS. 12A and 12B show an interval of 60 μm by a method of irradiating a plurality of irradiation positions PS with laser light so that the spots of the laser light overlap along the above-mentioned closed loop irradiation path pattern PT. They are 200 times enlarged sectional drawing and 1000 times enlarged sectional view of an insert metal member at the time of forming a concave part continuously. FIGS. 13A and 13B show an interval of 100 μm by a method of irradiating a plurality of irradiation positions PS with laser light so that the spots of the laser light overlap along the above-mentioned closed loop irradiation path pattern PT. They are 200 times enlarged sectional drawing and 1000 times enlarged sectional view of an insert metal member at the time of forming a concave part continuously. As is clear from comparison between FIG. 12 and FIG. 13, when the gap between two adjacent recesses is widened, the extension of a sufficient anchor around the opening of the recess when the power of the laser beam is weak. It can be seen that no part is available. When the power from the laser ratio is increased, even if the interval between the two concave portions is widened, an extended portion serving as a sufficient anchor is obtained around the opening of the concave portion.

In the above embodiment, copper, brass, or the like having a high laser beam reflectivity is used as the metal material, and POM or PPA is used as the resin material, which makes it difficult to obtain a bonding strength with the metal member. Of course, the present invention may be applied to the case of using a material.

According to the present invention, the crest-like extending portion extending so as to narrow the opening of the recessed portion becomes a strong anchor against the resin material that has entered the recessed portion and solidified, and therefore, the insert metal of the resin material is more than conventional. Bonding strength to the member can be greatly improved.

DESCRIPTION OF SYMBOLS 1 Insert metal member 3 Metal member 4 Recessed part 5 Roughening area | region 7 Resin member 9 Pipe 11 Metal resin molding 13 Laser equipment 31 Annular solidification part 32 Partition part 33 Connection cave 34 Extension part

Claims

An insert metal member for a metal-resin composite formed body in which a resin member is molded in a roughened region in which a plurality of recessed portions are formed on the surface of a metal member having a predetermined shape,
The annular wall portion surrounding the recessed portion is composed of an annular solidified portion generated in a state where the molten metal of the metal member is solidified,
The said annular solidification part is equipped with the 1 or more wave front-shaped extension part extended so that the opening part of the said recessed part may be narrowed, The insert metal member characterized by the above-mentioned.
The plurality of recesses include a part in which the partition between the two adjacent recesses is constituted by a part of the two adjacent annular solidification portions,
The insert metal member according to claim 1, wherein the crest-like extending portion is present in the vicinity of the partition wall portion.
A part of the crest-like extension part of one of the two adjacent concave parts is a molten metal scattered from the other concave part side of the two adjacent concave parts. The insert metal member according to claim 2, wherein is formed by solidification.
The insert metal member according to claim 2 or 3, wherein a communicating cave communicating between the two adjacent recessed portions is formed in the partition wall.
An average diameter of the plurality of recesses is 40 μm or more and 100 μm or less;
An average depth dimension of the plurality of recesses is 100 μm or more;
2. The insert metal member according to claim 1, wherein a distance between centers of two adjacent concave portions is 50 μm or more and 80 μm or less.
2. The metal member is copper, copper alloy, brass, plated copper plated with copper, plated copper alloy plated with copper alloy, or plated brass plated with brass. Insert metal member as described.
The surface of the metal member having a predetermined shape is irradiated with laser light to solidify the molten metal generated by partially melting the metal member, thereby forming a plurality of recesses on the surface to roughen the surface. A method of roughening a metal material forming a region,
A first step of irradiating the metal member with the laser beam to generate a molten metal, and forming a concave portion by an annular solidified portion formed by solidifying the molten metal;
Before the annular solidified portion of the previous concave portion is completely solidified, a predetermined distance is formed from the previous concave portion, and the metal member is irradiated with the laser light to generate the next molten metal, Forming the roughened region by repeating the second step of forming the next recessed portion by the next annular solidified portion formed by solidifying the next molten metal;
The laser beam power, spot diameter, and irradiation pattern are obtained by adhering and solidifying on the molten metal to form the recessed portion of the previous molten metal partly scattered. A method for roughening a metal material, characterized in that one or more crest-like extending portions extending so as to narrow the opening of the previous recessed portion are formed.
The irradiation pattern for forming one concave portion is a closed loop irradiation path pattern including a plurality of irradiation positions,
The metal material roughening method according to claim 7, wherein the laser light is irradiated to the plurality of irradiation positions so that the spots of the laser light overlap each other.
The partition between the previous recess and the next recess is formed by a part of the two adjacent annular solidification portions,
9. The rough surface of the metal material according to claim 8, wherein the power, spot diameter, and irradiation pattern of the laser beam are determined so that the crest-like extending portion exists in the vicinity of the partition wall portion. Method.
The laser beam power, the spot diameter, the irradiation pattern, and the distance between the centers of the two recesses are formed in the partition wall so that a communication cavern that connects the previous recess and the next recess is formed. The method for roughening a metal material according to claim 9, wherein the roughening method is defined.
An average diameter of the plurality of recesses is 40 μm or more and 100 μm or less;
An average depth dimension of the plurality of recesses is 100 μm or more;
The laser beam power, the spot diameter, the irradiation pattern, and the distance between the centers of the two recesses are determined so that the distance between the centers of the two adjacent recesses is not less than 50 μm and not more than 80 μm. The method for roughening a metal material according to claim 7 or 8.
The metal member of the predetermined shape is copper, copper alloy, brass, plated copper plated with copper, plated copper alloy plated with copper alloy, or plated brass plated with brass,
The laser beam power is 24 W to 80 W, the wavelength is 1054 nm to 1074 nm, the spot diameter of the laser beam is 45 μm to 75 μm, the irradiation path pattern is a circular pattern with a diameter of 25 μm to 100 μm, and laser light is scanned. The speed range is 100 mm / s to 1500 mm / s.
By irradiating the pulsed laser beam along the irradiation path pattern and setting the center-to-center distance between the concave portion to be formed next and the concave portion formed previously to 50 to 80 μm, the first step and The method for roughening a metal material according to claim 8, wherein the second step is performed.
A metal-resin composite molded body in which a resin member is molded in the roughened region of the insert metal member having a roughened region in which a plurality of recessed portions are formed on the surface of a predetermined-shaped metal member,
In the insert metal member, the annular wall portion surrounding the recessed portion is formed of an annular solidified portion generated in a state where the molten metal of the metal member is solidified, and the annular solidified portion narrows the opening of the recessed portion. One or more crest-shaped extensions extending to
The metal member of the predetermined shape is copper, copper alloy, brass, plated copper plated with copper, plated copper alloy plated with copper alloy, or plated brass plated with brass,
A metal resin composite molded article, wherein the resin member is made of polyacetal or polyphthalamide.
Manufacture of a metal-resin composite molded body in which an insert metal member having a roughened region in which a plurality of recesses are formed on the surface of a metal member having a predetermined shape is used as an insert, and a resin member is insert-molded in the roughened region. In the method, the insert metal member includes an annular wall portion surrounding the recessed portion, which is formed in a state where the molten metal of the metal member is solidified, and the annular solidified portion is an opening portion of the recessed portion. Using one or more crest-shaped extensions that extend so as to narrow
A method for producing a metal-resin composite molded body, wherein the insert metal member is subjected to insert molding at a molding temperature of the resin material of the resin member or a temperature close to the molding temperature.