TW202235193A - Method for producing junction and junction - Google Patents

Abstract

Provided is a method for producing a junction that enables both productivity and joining sealability of the obtained junction. A method for producing a junction, according to the present disclosure, includes: (A) a step for forming an uneven section on a surface of a first member containing a laser-transmitting resin; (B) a step for forming an uneven section on a surface of a second member containing a material other than resin; and (C) a step for overlaying the first and second members such that the uneven sections face one another, irradiating the uneven sections with laser light from the first member side, and causing the first member and the second member to be joined.

Description

Method for producing joined body and joined body

The disclosure relates to a method for manufacturing a joint body and the joint body.

Conventionally, as a method of joining a plurality of members made of different materials, there is known a method of irradiating a boundary surface between members with laser light and melting the materials by contact heat transfer to join them. For example, the member containing the material other than the resin is heated by irradiating the interface between the member containing the resin and the member containing the material other than the resin with laser light. Then, the member containing the resin is melted by heat transmitted from the member containing a material other than the resin, and the resin is solidified to perform bonding.

For example, Patent Document 1 proposes a method of joining members by combining a first member that transmits laser light and a metallic second member that makes the boundary surface in a concavo-convex state having microscopic holes with a diameter of 1 μm or less. The components are superimposed on each other, and laser light is irradiated.

In addition, Patent Document 2 proposes a member joining method in which a first member having a perforated portion having a specific shape and a second member are arranged adjacent to each other, the perforated portion is irradiated with laser light, and the second member is bonded. The two components are filled into the perforated part and cured. [Prior art literature] [Patent Document]

[Patent Document 1] Japanese Patent Laid-Open No. 2010-274279 [Patent Document 2] Japanese Patent Laid-Open No. 2016-43561

[Problem to be Solved by the Invention]

In the inventions of Patent Document 1 to Patent Document 2, members are bonded together by contact heat transfer. However, in such a case, the flatness required for the member (corresponding to the second member of the present disclosure) containing a material other than resin is high. If the flatness of a member containing a material other than resin is assumed to be low (for example, 200 μm or more), heat transfer from the concave portion in the joined portion becomes insufficient. Therefore, a gap is generated between the members after joining, and the joint sealing performance of the joined body is reduced. By performing laser scanning for a long time, the flatness of the member on the melting side can be improved, but in this case, productivity decreases.

Therefore, the inventors of the present application found that it was difficult to realize a bonding method capable of achieving both bonding sealing performance and productivity by the conventional method.

On the one hand, the present disclosure is made in view of such actual situation, and an object thereof is to provide a method for manufacturing a bonded body capable of achieving both productivity and joint-tightness of the obtained bonded body. [Means to solve the problem]

This disclosure adopts the following structures in order to solve the above-mentioned problems.

That is, the bonding method of a bonded body according to an aspect of the present disclosure includes the following steps (A) to (C): (A) a step of forming concavo-convex portions on the surface of the first member containing a resin having laser transparency; (B) a step of forming a concave-convex portion on the surface of the second member containing a material other than resin; and (C) overlapping the concave-convex portion of the first member with the concave-convex portion of the second member, The first member is irradiated with laser light to join the first member and the second member.

In addition, a bonded body according to an aspect of the present disclosure includes: a first member containing a resin having laser transparency and having unevenness on the surface; and a second member including a material other than resin and having unevenness on the surface so that The concavo-convex portion of the first member and the concavo-convex portion of the second member are relatively overlapped to join the first member and the second member. [Effect of the invention]

According to the present disclosure, it is possible to provide a method of manufacturing a bonded body capable of achieving both productivity and joint sealing properties of the obtained bonded body.

Hereinafter, an embodiment of one aspect of the present disclosure (hereinafter also referred to as “the present embodiment”) will be described based on the drawings.

§1 Application example First, an outline of a method for manufacturing a bonded body according to an aspect of the present disclosure will be described using FIG. 1 . FIG. 1 is a cross-sectional view illustrating a method of manufacturing a bonded body according to an aspect of the present disclosure.

As shown in FIG. 1 , the method of manufacturing the bonded body in this embodiment is to make the concave-convex portion 21 of the first member 1 containing a resin having laser transparency and the second member 2 containing a material other than resin. A method of manufacturing a bonded body in which the concavo-convex portions 22 are opposed to each other and bonded by irradiating the bonded portion 4 with laser light 3 . The manufacturing method of the bonded body of this embodiment includes the following steps (A) to (C): (A) the step of forming the concave-convex portion 21 on the surface of the first member 1 containing a resin having laser transparency; (B) ) a step of forming the concave-convex portion 22 on the surface of the second member 2 containing a material other than resin; A step of bonding the first member 1 and the second member 2 by irradiating the first member 1 with laser light 3 .

The concavo-convex portion 21 of the first member formed in the step (A) absorbs the laser light 3 in a short time and softens or melts, so the laser scanning time at the time of bonding can be shortened. In addition, the concavo-convex portion 21 of the first member is solidified in the joint portion 4 to be embedded in the concavo-convex portion 22 of the second member formed in step (B) to form a bonded body, thereby providing a bonded body excellent in joint sealing properties.

§2 Structural example [Manufacturing method of joint body] ＜Step (A)＞ Step (A) in the method of manufacturing a bonded body according to an embodiment of the present disclosure (hereinafter also referred to as the present manufacturing method) is a step of forming unevenness on the surface of the first member containing a resin having laser transparency. Since the concave-convex portion is formed on the surface of the first member, the laser light is transmitted through the portion other than the concave-convex portion of the first member during bonding in step (C) described later, and the laser light is absorbed by the concave-convex portion of the first member. That is, the concavo-convex portion in the first member may also be referred to as a concavo-convex portion capable of absorbing laser light. Therefore, only the concavo-convex portion of the first member and the first member in the vicinity thereof are softened and melted. Therefore, even if the laser scanning time is short, the bonded body has high bond-tightness.

The method of forming the concavo-convex portion of the first member can be performed by any forming method. Such arbitrary forming methods include, for example, laser processing, processing with sandpaper, molding with an ultra-precision mold, micro-cutting, and the like.

Examples of lasers used to form the concavo-convex portion of the first member include: CO ₂ laser, fiber laser, yttrium aluminum garnet (Yttrium Aluminum Garnet, YAG) laser, YVO ₄ laser, semiconductor laser, quasi- Molecular lasers, etc. From the viewpoint of the laser absorption properties of the concavo-convex portion of the first member, it is preferable to use a CO ₂ laser. In addition, the irradiation conditions of the laser can be changed as appropriate according to the desired shape of the concavo-convex portion of the first member. That is, the laser may be, for example, a continuous wave or a pulsed wave.

(first component) The first member contains a resin having laser transparency. Examples of such resins include thermoplastic resins and thermosetting resins.

Examples of the thermoplastic resin include: polyvinyl chloride (Polyvinyl Chloride, PVC), polystyrene (Polystyrene, PS), acrylonitrile-styrene (Acrylonitrile Styrene, AS), acrylonitrile-butadiene-styrene (Acrylonitrile Butadiene Styrene, ABS), polymethyl methacrylate (Polymethyl Methacrylate, PMMA), polyethylene (Polyethylene, PE), polypropylene (Polypropylene, PP), polycarbonate (Polycarbonate, PC), modified polystyrene Ether (Modification-Polyphenylene Ether, M-PPE), polyamide 6 (PA (Polyamide) 6), polyamide 66 (PA66), polyacetal (Polyacetal, POM), polyethylene terephthalate ( Polyethylene Terephthalate, PET), Polybutylene Terephthalate (PBT), Polysulphone (PSF), Polyarylate (PAR), Polyetherimide (PEI), Poly Polyphenylene Sulfide (PPS), Polyether Sulphone (PES), Polyether Ether Ketone (PEEK), Polyamideimide (PAI), Liquid Crystal Polymer (Liquid Crystal Polymer, LCP), polyvinylidene chloride (Polyvinylidene Chloride, PVDC), polytetrafluoroethylene (Polytetrafluoroethylene, PTFE), polychlorotrifluoroethylene (Polychlorotrifluoroethylene, PCTFE) and polyvinylidene fluoride (Polyvinylidene Fluoride, PVDF). In addition, it may be a thermoplastic elastomer (Thermoplastic Elastomer, TPE). As an example of TPE, thermoplastic polyolefin (Thermoplastic Polyolefin, TPO) (olefin system), thermoplastic styrene (Thermoplastic Styrene, TPS) (styrene system) ), Thermoplastic Polyester Elastomer (TPEE) (ester system), thermoplastic polyurethane (Thermoplastic Polyurethane, TPU) (urethane system), thermoplastic polyamide (Thermoplastic Polyamide, TPA ) (nylon) and thermoplastic polyvinyl chloride (Thermoplastic Polyvinyl Chloride, TPVC) (vinyl chloride). In addition, examples of the thermosetting resin include: epoxy resin (Epoxy, EP), polyurethane (Polyurethane, PUR), urea formaldehyde (Urea Formaldehyde, UF), melamine formaldehyde (Melamine Formaldehyde) , MF), phenol formaldehyde (Phenol Formaldehyde, PF), unsaturated polyester (Unsaturated Polyester, UP) and silicone (Silicone, SI). In addition, fiber reinforced plastic (Fiber Reinforced Plastic, FRP) may also be used. As FRP, carbon fiber reinforced thermoplastic resin (Carbon Fiber Reinforced Thermoplastic, CFRTP) etc. are mentioned, for example. Among them, PMMA is preferable from the viewpoint of being excellent in workability and strength.

FIG. 3 schematically shows a first member 1 used in Examples described later. The first member 1 shown in FIG. 3 is merely an example, and the shape and size of the first member 1 and the formation positions of the concavo-convex portions 21 are not particularly limited, and can be changed as appropriate. As in the example shown in FIG. 3 , the concave-convex portion 21 of the first member is formed on the surface of the first member 1 .

The laser absorption rate of the concavo-convex portion of the first member is preferably at least 10%, more preferably at least 20%, and still more preferably at least 30%. The upper limit of the laser absorptivity is not particularly limited, and may be, for example, 100% or less. If the laser absorptivity is in the above range, the concavo-convex portion of the first member and its periphery are more likely to be softened or melted in the step (C) described later, and thus the bonded sealability of the bonded body obtained is improved.

The laser absorptivity can be calculated by the following equation by measuring the laser transmittance using a laser power meter, for example. Alternatively, the absorbance may be directly measured using an integrating sphere or the like.

100 (%)-transmittance (%)=laser absorption rate (%) On the other hand, the laser absorptivity of the first member other than the concavo-convex portion is preferably less than 10%, more preferably 9% or less, further preferably 8% or less. When the laser absorptivity of the portion other than the concave-convex portion of the first member is within the above-mentioned range, the laser light is easily concentrated on the concave-convex portion of the first member, and the productivity of the bonded body obtained is improved.

The processed shape of the concave-convex portion of the first member is not particularly limited. For example, a plurality of grooves may be formed in the concavo-convex portion, a plurality of perforations may also be formed, and an irregular shape may also be formed.

6 to 8 illustrate the shape of the concavo-convex portion of the first member according to the embodiment. The shape shown in FIG. 6 is a shape in which regular grooves are formed. The shape shown in FIG. 7 is a shape formed with a plurality of regular perforations. In this specification, for convenience, the shape shown in FIG. 7 is also referred to as "point cloud shape". The shape shown in FIG. 8 has irregular irregularities. In this specification, for convenience, the shape shown in FIG. 8 is also referred to as "random shape". The concavo-convex portion of the first member may also be partially formed in various shapes. That is, for example, the shape shown in FIG. 6 and the shape shown in FIG. 7 can coexist.

The ratio of the depth of the concavo-convex part of the first member to the flatness tolerance of the concavo-convex part of the second member is preferably 50% or more, more preferably 80% or more, further preferably 100% or more, most preferably 120% or more. The upper limit of the ratio of the depth of the concavo-convex portion of the first member to the flatness tolerance of the concavo-convex portion of the second member is not particularly limited, and may be, for example, 200% or less. If the depth of the concave-convex part of the first member is within the above range, the first member softened or melted by the laser can be sufficiently filled into the concave-convex part of the second member, and thus the bonded sealability of the bonded body is improved.

Hereinafter, the depth of the concavo-convex portion of the first member will be described with reference to FIG. 2 . FIG. 2 is an enlarged schematic view of an example of a joint portion where the concave-convex portion of the first member and the concave-convex portion of the second member are relatively overlapped. In the example shown in FIG. 2 , the depth 11 of the concave-convex portion of the first member refers to the vertical distance from the surface of the first member 1 in the joining portion to the bottom of the concave-convex portion of the first member. That is, when the shape of the concavo-convex portion of the first member is a point cloud shape, it refers to the vertical distance from the opening of the perforated hole to the bottom. In addition, when the uneven part of a 1st member is a groove shape, it means the vertical distance from the surface of a 1st member to a groove bottom. Furthermore, when the unevenness|corrugation part of a 1st member is an irregular shape, it means 6 times standard deviation of the depth of the unevenness|corrugation part of several measurement points selected at random. From the viewpoint of improving measurement accuracy, the number of measurement points for measuring the depth may be, for example, 100 or more. When a plurality of shapes coexist in the concavo-convex portion of the first member, the average value of each shape may be used. The depth of the concavo-convex portion of the first member can be measured, for example, by a non-contact optical three-dimensional shape measuring device.

In addition, in this specification, the flatness tolerance 12 of the second member refers to the total value of the depth of the concavo-convex portion of the second member measured by the non-contact optical three-dimensional shape measuring device and the flatness originally possessed by the second member. In addition, the depth of the concavo-convex portion of the second member can be defined in the same manner as the depth of the concavo-convex portion of the first member.

The depth of the concavo-convex part of the first member can be adjusted by changing the scanning times of the laser and the like. For example, if the number of laser scans is increased, the depth of the concave-convex portion becomes deeper, and if the number of laser scans is decreased, the depth of the concave-convex portion becomes shallower.

A filler may be added to the first member. Examples of fillers include inorganic fillers (glass fibers, inorganic salts, etc.), metal fillers, organic fillers, carbon fibers, and the like.

In addition to the above-mentioned resin having laser transparency, the first member may optionally contain additives within a range that does not hinder the above-mentioned effects. Examples of additives include sizing agents, dispersants, antioxidants, ultraviolet absorbers, antistatic agents, flame retardants, lubricants, crystal nucleus materials, plasticizers, dyes, pigments, and carbon nanotubes.

＜Step (B)＞ The step (B) in this manufacturing method is a step of forming the concavo-convex part on the surface of the second member containing a material other than resin. Through this step, the softened or melted first member can be firmly bonded to the second member in the step (C) described later, and thus the strength of the obtained bonded body is improved.

The method of forming the concave-convex portion of the second member is not particularly limited, and examples thereof include laser processing, processing with sandpaper, electrical discharge machining, molding with an ultra-precision mold, micromachining, and electrochemical treatment.

Examples of lasers used to form the concave-convex portion of the second member include fiber lasers, YAG lasers, _YVO4 lasers, semiconductor lasers, _CO2 lasers, and excimer lasers. From the viewpoint of efficiently processing the second member, it is preferable to use a fiber laser. In addition, in the case of using a fiber laser, it is possible to irradiate a laser in which one pulse consists of a plurality of subpulses.

When the second member is irradiated with laser light, the second member is partially melted to form perforations. At this time, if the laser is composed of a plurality of sub-pulses, the melted second member is less likely to scatter, and is more likely to be deposited near the perforation. The second member deposited inside the through hole becomes a protrusion on the inner peripheral surface of the through hole. Therefore, it is easy to form the perforation into a shape having protrusions on the inner peripheral surface described later. In addition, the irradiation direction of the laser may be perpendicular to the surface of the second member from the viewpoint of forming the perforation perpendicular to the surface.

(second component) The second member contains a material other than resin. The material contained in the second member is not particularly limited as long as it can be used in the bonded body of the present disclosure. As such a material, metal, stone, glass, ceramics, etc. are mentioned, for example.

Among the above materials, the second member preferably contains metal. Examples of the metal include iron-based metals, stainless steel-based metals, copper-based metals, aluminum-based metals, magnesium-based metals, and alloys thereof. In addition, the method of forming the second member is not particularly limited, and may be mechanical cutting, metal forming, zinc die-casting, aluminum die-casting, powder metallurgy, casting, and the like.

When the second member contains metal, it has excellent durability, is easy to process, and has electrical conductivity, so it is easy to use the obtained bonded body in electronic devices and the like.

FIG. 4 schematically shows a second member used in Examples described later. The second member 2 shown in FIG. 4 is merely an example, and the shape, size, and formation positions of the concavo-convex portions of the second member 2 are not particularly limited, and can be changed as appropriate. As in the example shown in FIG. 4 , the unevenness 22 of the second member is formed on the surface of the second member 2 . It should be noted that the groove 23 shown in FIG. 4 is formed to reproduce the flatness tolerance that the second member may have, and is not an essential component of the second member.

Fig. 9 schematically illustrates an example of the shape of the concavo-convex portion of the second member according to the embodiment. The shape shown in FIG. 9 corresponds to, for example, dependent concave-convex shapes such as the groove shape, the random shape, and combinations of these shapes described with respect to the first member. The shape of the concavo-convex portion of the second member is not limited to the shape shown in FIG. 9 , and may be an independent concavo-convex shape having independent non-penetrating through holes such as a point cloud shape. In addition, dependent concave-convex shapes and independent concave-convex shapes may coexist. In this specification, "non-independent" means that the boundary lines of the shapes of the concavo-convex portion of the second member are not clear, and each shape (for example, grooves, etc.) overlaps.

Fig. 10 schematically illustrates an example of the shape of the concavo-convex portion of the second member according to the embodiment. The concavo-convex portion of the second member preferably has mutually independent non-penetrating through holes as shown in FIG. 10 . That is, when viewed from a direction perpendicular to the surface on which the perforations are formed, it is preferable that the openings of the perforations do not overlap and the boundaries between the perforations are clear. The perforations are distinguished from continuous grooves. Since the concavo-convex portion of the second member has non-penetrating through holes independent of each other, the contact area between the second member and the first member is further increased, and thus the durability of the obtained bonded body is improved.

The shape of the perforation is not particularly limited. For example, the perforation may have a constant diameter in the cross section perpendicular to the depth direction, or may have at least one of a region where the diameter of the cross section perpendicular to the depth direction expands and decreases from the opening toward the bottom.

FIG. 11 schematically illustrates an example of the shape of the concavo-convex portion of the second member according to the embodiment. For example, as shown in the example of FIG. 11 , the perforation preferably has a protruding shape on the inner peripheral surface. Specifically, it is preferable to have a shape having an enlarged region after a region with a reduced diameter in a cross section perpendicular to the depth direction of the perforated hole. If the through hole has a protruding shape on the inner peripheral surface, the first member is more firmly bonded to the second member, so the bonded interface of the obtained bonded body exhibits good resistance to both shear stress and vertical stress. high durability.

When forming the perforation into a shape having protrusions on the inner peripheral surface, it is preferable to irradiate the laser in which the one pulse consists of a plurality of sub-pulses. When the second member is irradiated with laser light, the second member is partially melted to form perforations. At this time, if the laser is composed of a plurality of sub-pulses, the melted second member is less likely to scatter, and is more likely to be deposited near the perforation. The second member deposited inside the through hole becomes a protrusion on the inner peripheral surface of the through hole. Therefore, it is easy to make the perforation into a shape having a protrusion on the inner peripheral surface. In addition, the irradiation direction of the laser may be perpendicular to the surface of the second member from the viewpoint of forming the perforation perpendicular to the surface.

The flatness tolerance of the concavo-convex portion of the second member is not particularly limited, and may be, for example, 200 μm or less, or may be 200 μm or more. If the flatness tolerance of the second member is greater than or equal to 200 μm, when the conventional bonding method is used, the bonded sealability and productivity of the bonded body obtained will decrease. On the other hand, according to this manufacturing method, even if the flatness tolerance of the second member is 200 μm or more, the first member and the second member have concavo-convex parts, so it is possible to manufacture joint sealability and excellent productivity. of junctions. In addition, as mentioned above, the flatness tolerance of the concave-convex portion of the second member can also be appropriately adjusted relative to the depth of the concave-convex portion of the first member.

＜Step (C)＞ The step (C) in this manufacturing method is to make the concavo-convex part of the first member overlap with the concavo-convex part of the second member, irradiate laser light from the side of the first member, and make the first member and the concavo-convex part The step of engaging the second member. Through this step, the concavo-convex portion of the first member is softened or melted, and is solidified in a form embedded in the concavo-convex portion 22 of the second member, thereby forming a bonded body.

The portion other than the concave-convex portion on the side of the first member can transmit laser light, so the concave-convex portion of the first member can be efficiently softened or melted by irradiating laser light from the first member side.

As a laser light irradiation method at the time of joining of the said 1st member and a 2nd member, for example, the laser spot for joining can also be performed by irradiating the joint part and performing laser scanning repeatedly on the joint part.

Examples of lasers used for bonding include LD lasers, fiber lasers, YAG lasers, YVO ₄ lasers, semiconductor lasers, CO ₂ lasers, and excimer lasers. The LD laser is preferable from the viewpoint of easily transmitting parts other than the concavo-convex part of the first member and minimizing the influence of heat on the first member other than the bonding part.

[Joint body] A bonded body (hereinafter also referred to as this bonded body) according to an embodiment of the present disclosure includes: a first member containing a resin having laser transparency and having unevenness on the surface; and a second member containing a material other than resin and Concave-convex portions are formed on the surface, and the concavo-convex portions of the first member and the concavo-convex portions of the second member are relatively overlapped to join the first member and the second member. The first member and the second member of this joined body are as described above. In this bonded body, the concavo-convex portion of the first member is solidified so as to be embedded in the concavo-convex portion of the second member, and thus is superior in productivity and joint sealing performance compared to the conventional bonded body.

The present disclosure is not limited to the above-mentioned embodiments, and various changes can be made within the scope indicated in the patent claims. Embodiments obtained by appropriately combining technical means disclosed in different embodiments are also included in this disclosure. within the scope of the technology disclosed. 〔Summarize〕

A bonding method of a bonded body according to an aspect of the present disclosure includes the following steps (A) to (C): (A) a step of forming a concavo-convex portion on the surface of a first member containing a resin having laser transparency; (B ) a step of forming a concave-convex portion on the surface of the second member containing a material other than resin; and (C) overlapping the concave-convex portion of the first member with the concave-convex portion of the second member, A step of irradiating the member side with laser light to join the first member and the second member.

In the above structure, the surface of the first member is formed with concavo-convex portions to increase the laser absorption rate. When the concave-convex portion of the first member whose laser absorptivity has been improved is irradiated with laser light, it softens or melts in a short time. Therefore, the laser scanning time at the time of joining can be shortened. In addition, the softened or melted concavo-convex portion of the first member is solidified in a form embedded in the concavo-convex portion of the second member, thereby forming a bonded body. Therefore, a joined body having excellent joint sealing properties can be manufactured.

In the method for manufacturing a joined body according to the aspect, the second member may contain metal. According to this configuration, the durability of the second member is excellent, and it is easy to use the obtained bonded body in electronic devices and the like.

In the method of manufacturing a bonded body according to the above aspect, the laser absorption rate of the concavo-convex portion of the first member may be 10% or more. According to this configuration, the concavo-convex portion of the first member and its periphery are more easily softened or melted, so that the joint sealability of the obtained joined body is improved.

In the manufacturing method of the joined body according to the aspect, the concavo-convex portion of the second member may have independent non-through holes. According to this configuration, since the concavo-convex portion of the second member has independent, that is, non-overlapping perforations, the contact area between the second member and the first member is further increased, and thus the joint body obtained is Joint sealing is improved.

In the method for manufacturing a bonded body according to the aspect, the through hole may have a protrusion on an inner peripheral surface. According to this structure, the first member and the second member are firmly bonded by the protrusion of the inner peripheral surface of the through hole, so both the shear stress and the vertical stress of the bonded portion of the obtained bonded body improve.

In the method for manufacturing a bonded body according to the aspect, the ratio of the depth of the concavo-convex portion of the first member to the flatness tolerance of the concavo-convex portion of the second member may be 50% or more. According to this configuration, the first member softened or melted by the laser can be sufficiently filled in the concavo-convex portion of the second member, so that the bonding sealing performance of the obtained bonded body is improved.

In this specification, "the flatness tolerance of the concave-convex portion of the second member" refers to the flatness tolerance of the concave-convex portion of the second member measured by a non-contact optical three-dimensional shape measuring device. In addition, in this specification, "the depth of the uneven part of a 1st member" means the vertical distance from the surface of a 1st member to the bottom of the uneven part of a 1st member. In this specification, "the ratio to the flatness tolerance is 50% or more" means, for example, the depth of the concave-convex portion of the first member when the flatness tolerance of the concave-convex portion of the second member is 200 μm. 100 μm or more.

In addition, a bonded body according to an aspect of the present disclosure includes: a first member containing a resin having laser transparency and having unevenness on the surface; and a second member including a material other than resin and having unevenness on the surface so that The concavo-convex portion of the first member and the concavo-convex portion of the second member are relatively overlapped to join the first member and the second member. According to the above configuration, the bonded body is superior in productivity and joint sealing performance compared to conventional bonded bodies. [Example]

Hereinafter, although this indication is demonstrated in more detail based on an Example, this indication is not limited to the following Example.

〔Measurement of laser absorption rate〕 Using a laser power meter (manufactured by Ophir Optronics), the laser transmittance of the concave-convex portion of the first member was measured from the opposite side of the surface on which the concave-convex portion of the first member was formed. Formula to calculate the laser absorption rate.

100 (%)-transmittance (%)=laser absorption rate (%) 〔Flatness Tolerance〕 The depth of the concave-convex portion of the first member and the flatness tolerance of the concave-convex portion of the second member were measured using a non-contact optical three-dimensional measuring device LEXT OLS4500 (manufactured by Olympus).

[Evaluation of Joint Sealability] The joint sealing performance of the joined body is evaluated by the IPX7 test and the thermal shock test.

The IPX7 test was carried out using the MSZ-0700 series (series) (manufactured by Fukuda Co., Ltd.), which can check the waterproofness of sealed products equivalent to IPX7.

The thermal shock test was implemented using a thermal shock tester (manufactured by Espec). Regarding the thermal shock test, the low temperature side was set at -40°C for 30 minutes, and the high temperature side was set at 70°C for 30 minutes. In addition, one cycle is set so that the low-temperature side and the high-temperature side are circulated once each.

In the table, "×" is used to indicate the failure of the IPX7 test immediately after joining, and "○" is indicated to the case of passing the IPX7 test immediately after joining. The case of passing the IPX7 test is expressed as "◎", and the case of passing the IPX7 test after implementing 100 cycles of thermal shock test is expressed as "◎◎".

[Example 1] A circular PMMA (22 mm in diameter, 1 mm in thickness) as a resin material was used as the first member. Concave-convex processing was performed by irradiating the first member with a CO ₂ laser using a CO ₂ laser processing machine Speedy 100 (manufactured by Trotec Laser).

As shown in FIG. 3 , the concavo-convex portion 21 of the first member was formed in a region having a width of 3 mm from the outer periphery of the first member 1 . Table 1 shows the CO ₂ laser irradiation conditions during the concave-convex processing. In addition, the processed shape of the concavo-convex portion 21 of the first member is a point cloud shape as shown in FIG. 7 .

Stainless steel (SUS304) was used as the second member. Concave-convex processing was performed on the second member by a fiber laser marker (Fiber Laser Marker) MX-Z2000H (manufactured by Omron Co., Ltd.). The flatness tolerance of the concavo-convex portion of the second member was set to 200 μm.

As shown in FIG. 4 , the second member 2 includes an annular joint surface with an outer diameter of 20 mm and an inner diameter of 18 mm. 12 is a schematic view overlooking the side of the second member 2 where the annular joint surface exists, and an enlarged view of a portion where the groove 23 is formed on the annular joint surface of the second member 2 . As shown in FIG. 12 , a groove 23 having a width of 3 mm and a depth of 0.15 mm is formed on the annular joint surface. The concavo-convex portion 22 of the second member is formed on the annular joint surface including the portion of the groove 23 . Furthermore, this groove 23 is formed in order to reproduce the flatness tolerance of about 200 μm that the second member can have. That is, the depth of the groove 23 corresponds to the flatness tolerance that the second member may have. Table 2 shows the irradiation conditions of the laser marker during the concave-convex processing. In addition, the shape of the uneven|corrugated part 22 of a 2nd member is an independent shape shown in FIG. 9. As shown in FIG.

As shown in FIG. 1 , the concavo-convex portion 21 of the first member and the concavo-convex portion 22 of the second member are overlapped so as to be in contact with each other, and are set in a jig for joining. Next, LD laser (manufactured by Jenoptik) is used from the side opposite to the concavo-convex part 21 of the first member, and the bonding part is irradiated with infrared laser while pressurizing the cylinder built in the jig for bonding. Scanning and splicing are repeated. The irradiation conditions of the infrared laser at the time of bonding were as shown in Table 4. The concavo-convex portion 21 of the first member is melted with a laser, embedded in the concavo-convex portion 22 of the second member, and solidified to obtain a bonded body. Fig. 5 schematically shows the shape of the obtained bonded body.

[Example 2] Except that the laser irradiation conditions for forming the concave-convex portion of the first member were changed as shown in Table 1, and the shape of the concave-convex portion of the first member was set to the groove shape shown in FIG. 6 , it was the same as in Example 1. Get joints.

[Example 3] Except that the laser irradiation conditions for forming the concavo-convex portion of the first member were changed as shown in Table 1, and the shape of the concavo-convex portion of the first member was set to a random shape as shown in FIG. 8 , it was the same as in Example 1. to obtain junctions.

[Example 4] Bonding was obtained in the same manner as in Example 1, except that the laser irradiation conditions for forming the concave-convex portion of the second member were changed as shown in Table 1, and the shape of the concave-convex portion was set to an independent perforated portion as shown in FIG. 10 . body.

[Example 5] Except that the laser irradiation conditions for forming the concave-convex portion of the second member are changed as shown in Table 1, and the shape of the concave-convex portion is set as an independent perforation portion having a protrusion on the inner peripheral surface shown in FIG. 11 , and A joint body was obtained in the same manner as in Example 4.

[Example 6] A bonded body was obtained in the same manner as in Example 5 except that the laser irradiation conditions for forming the concavo-convex portion of the first member were changed as shown in Table 1. Furthermore, the concavo-convex portion of the first member of Example 6 has a smaller number of perforated holes per unit area than that of Example 5.

[Example 7] A bonded body was obtained in the same manner as in Example 5 except that the laser irradiation conditions for forming the concavo-convex portion of the first member were changed as shown in Table 1. Furthermore, the number of perforated holes per unit area is smaller in the concavo-convex portion of the first member in Example 7 than in Examples 5 and 6.

[Example 8] A bonded body was obtained in the same manner as in Example 5 except that the laser irradiation conditions for forming the concavo-convex portion of the first member were changed as shown in Table 1.

[Example 9] A bonded body was obtained in the same manner as in Example 5 except that the laser irradiation conditions for forming the concavo-convex portion of the first member were changed as shown in Table 1.

[Comparative Example 1] A bonded body was obtained in the same manner as in Example 1, except that the first member was not subjected to uneven processing.

[Comparative Example 2] A bonded body was obtained in the same manner as in Example 4, except that the first member was not subjected to uneven processing.

[Comparative Example 3] A bonded body was obtained in the same manner as in Example 5, except that the first member was not subjected to uneven processing.

[Reference example 1] A bonded body was obtained in the same manner as in Example 1, except that the first member was not subjected to concavo-convex processing, and the irradiation conditions of the infrared laser during bonding were changed as shown in Table 4.

[Reference example 2] A bonded body was obtained in the same manner as in Example 5, except that the first member was not subjected to concavo-convex processing, and the irradiation conditions of the infrared laser at the time of bonding were changed as shown in Table 4.

Table 1 shows the laser irradiation conditions for forming the concavo-convex portion of the first member in Examples 1 to 9.

[Table 1] Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 output[%] 70 100 60 70 70 70 70 70 70 Scanning speed [mm/s] 80 40 40 80 80 80 80 80 80 scan times 3 3 2 3 3 3 3 4 2 Scanning line interval [μm] 200 200 25 200 200 250 500 200 200 Pulse frequency [Hz] 1000 1000 1000 1000 1000 500 500 1000 1000

Table 2 shows the laser irradiation conditions for forming the concavo-convex portion of the second member in Examples 1 to 9.

[Table 2] Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 output [W] 3 3 3 Scanning speed [mm/sec] 300 650 650 scan times 20 20 20 Scanning line interval [μm] 56 56 56 Pulse frequency [Hz] 10000 10000 10000 Number of pulses 0 (no subpulse) 0 (no subpulse) 20

Table 3 shows the laser irradiation conditions for forming the concavo-convex portion of the second member in Comparative Example 1 to Comparative Example 3 and Reference Example 1 to Reference Example 2.

[table 3] Comparative example 1 Comparative example 2 Comparative example 3 Reference example 1 Reference example 2 output [W] 3 3 3 3 3 Scanning speed [mm/sec] 300 650 650 300 650 scan times 20 20 20 20 20 Scanning line interval [μm] 56 56 56 56 56 Pulse frequency [Hz] 10000 10000 10000 10000 10000 Number of pulses 0 (no subpulse) 0 (no subpulse) 20 0 (no subpulse) 20

Table 4 shows the laser irradiation conditions for bonding the first member and the second member in Examples 1 to 9, Comparative Examples 1 to 3, and Reference Examples 1 to 2.

[Table 4] Example 1 to Example 9 Comparative Example 1 to Comparative Example 7 Reference example 1 to reference example 2 output [W] 24W 24W Scanning speed [mm/s] 30 30 Joint pressure [MPa] 1.35 1.35 Spot diameter [mm] Φ2.0 Φ2.0 Number of scans/scanning time [s] 30 times/60 s 90 times/180 s

〔result〕 Table 5 shows the processing conditions of the concavo-convex portion of the first member in Examples 1 to 3, Comparative Example 1, and Reference Example 1 and the evaluation results of joint sealing properties. In addition, when the uneven part was not formed in the 1st member, the depth of the uneven|corrugated part of the 1st member was made into "-".

[table 5] Example 1 Example 2 Example 3 Comparative example 1 Reference example 1 first component Material PMMA PMMA PMMA PMMA PMMA Processing shape point group groove No rules none none Depth of concave and convex 240μm 240μm 240μm - - Laser absorption rate 45% 37% 47% Below 8% Below 8% second component Material SUS304 SUS304 SUS304 SUS304 SUS304 Flatness Tolerance 200μm 200μm 200μm 200μm 200μm Processing shape Dependent (groove or random) bump shapes Dependent (groove or random) bump shapes Dependent (groove or random) bump shapes Dependent (groove or random) bump shapes Dependent (groove or random) bump shapes Number of scans/scanning time [s] 30 times/60 s 30 times/60 s 30 times/60 s 30 times/60 s 90 times/180 s Evaluation results ○ ○ ○ x ○

As can be seen from Table 5, Examples 1 to 3, in which the first member was roughened, exhibited more excellent joint sealability than Comparative Example 1, in which the first member was not roughened. In addition, although the number of times of scanning of the bonding laser in Examples 1 to 3 was less than that of Reference Example 1, they showed the same level of bonding sealing properties. Therefore, it was shown that the bonded body of Examples 1 to 3 is superior in productivity to the bonded body of Reference Example 1.

Table 6 shows the conditions of the concavo-convex portions of Examples 4 to 5, Comparative Example 2, and Reference Example 2 and the evaluation results of joint sealing properties.

[Table 6] Example 4 Example 5 Comparative example 2 Comparative example 3 Reference example 2 first component Material PMMA PMMA PMMA PMMA PMMA Processing shape point group point group none none none Depth of concave and convex 240μm 240μm - - - Laser absorption rate 45% 45% Below 8% Below 8% Below 8% second component Material SUS304 SUS304 SUS304 SUS304 SUS304 Flatness Tolerance 200μm 200μm 200μm 200μm 200μm Processing shape Independent perforation without protrusions on the inner peripheral surface Independent perforation with protrusions on the inner peripheral surface Independent perforation without protrusions on the inner peripheral surface Independent perforation with protrusions on the inner peripheral surface Independent perforation with protrusions on the inner peripheral surface Number of scans/scanning time [s] 30 times/60 s 30 times/60 s 30 times/60 s 30 times/60 s 90 times/180 s Evaluation results ◎ ◎◎ x x ◎

As can be seen from Table 6, Examples 4 to 5, in which the first member was roughened, exhibited more excellent joint sealability than Comparative Examples 2 and 3, in which the first member was not roughened. In addition, compared with Reference Example 2, even when the number of times of scanning of the bonding laser is small, the bonding sealing performance of the same level is exhibited. Therefore, it was shown that the bonded body of Examples 4 to 5 is superior in productivity to the bonded body of Reference Example 2.

Furthermore, Examples 4 to 5 in which the processed shape of the second member was changed to a perforated portion exhibited superior joint sealing properties compared to Examples 1 to 3.

Table 7 shows the conditions of the concavo-convex portion and the evaluation results of joint sealing properties in Examples 5 to 9.

[Table 7] Example 5 Example 6 Example 7 Example 8 Example 9 first component Material PMMA PMMA PMMA PMMA PMMA Processing shape point group point group point group point group point group Depth of concave and convex 240μm 240μm 240μm 320 μm 160μm Laser absorption rate 45% twenty one% 45% 46% 43% second component Material SUS304 SUS304 SUS304 SUS304 SUS304 Flatness Tolerance 200μm 200μm 200μm 200μm 200μm Processing shape Independent perforation with protrusions on the inner peripheral surface Independent perforation with protrusions on the inner peripheral surface Independent perforation with protrusions on the inner peripheral surface Independent perforation with protrusions on the inner peripheral surface Independent perforation with protrusions on the inner peripheral surface Number of scans/scanning time [s] 30 times/60 s 30 times/60 s 30 times/60 s 30 times/60 s 30 times/60 s Evaluation results ◎◎ ◎ ○ ◎◎ ◎

As can be seen from Table 7, all of Examples 5 to 9 in which the first member was roughened showed excellent joint sealing properties. In addition, it can be seen that the higher the laser absorptivity of the concavo-convex portion of the first member, the more excellent the bonding and sealing performance is exhibited. [industrial availability]

An aspect of the present disclosure can be used, for example, in all devices that require a metal-to-resin based bond or a metal-to-resin based bonded seal.

1: first component 2: Second component 3: laser light 4: Joint 11: Depth of the concavo-convex portion of the first member 12: Flatness tolerance of the second member 21: Concave-convex part/concave-convex part of the first member 22: Concave-convex part/concave-convex part of the second member 23: Slot

FIG. 1 schematically shows an example of a method for joining a joined body according to the embodiment. FIG. 2 schematically shows an enlarged example of a joint portion of the joint body according to the embodiment. Fig. 3 schematically shows the first member of the embodiment. Fig. 4 schematically shows the second member of the embodiment. Fig. 5 schematically shows a joined body of an example. Fig. 6 is a laser microscope image showing an example of a concavo-convex portion of the first member according to the embodiment. Fig. 7 is a laser microscope image showing an example of a concavo-convex portion of the first member according to the embodiment. Fig. 8 is a laser microscope image showing an example of a concavo-convex portion of the first member according to the embodiment. Fig. 9 schematically shows an example of the concavo-convex portion of the second member according to the embodiment. FIG. 10 schematically shows an example of the concavo-convex portion of the second member according to the embodiment. Fig. 11 schematically shows an example of the concavo-convex portion of the second member according to the embodiment. Fig. 12 schematically shows the second member of the embodiment.

1: first component

2: Second component

3: laser light

4: Joint

21: Concave-convex part of the first member

22: Concave-convex part of the second member

Claims (7)

A method for manufacturing a junction body, comprising the following steps (A) to (C): (A) A step of forming concavo-convex portions on the surface of the first member including the resin having laser transparency; (B) a step of forming concavo-convex portions on the surface of the second member containing a material other than resin; and (C) The concavo-convex portion of the first member and the concavo-convex portion of the second member are superimposed on each other, and laser light is irradiated from the side of the first member to join the first member and the second member. step. The method of manufacturing a joined body according to claim 1, wherein the second member contains metal. The method of manufacturing a bonded body according to claim 1 or claim 2, wherein the laser absorption rate of the concavo-convex portion of the first member is 10% or more. The method of manufacturing a bonded body according to claim 1 or claim 2, wherein the concavo-convex portion of the second member has independent non-through holes. The method of manufacturing a bonded body according to claim 4, wherein the through hole has a protrusion shape on the inner peripheral surface. The method of manufacturing a bonded body according to claim 1 or claim 2, wherein the ratio of the depth of the concavo-convex portion of the first member to the flatness tolerance of the concavo-convex portion of the second member is 50% or more. A conjugate comprising: The first member contains a resin with laser transparency and has unevenness on the surface; and The second member contains a material other than resin and has unevenness on the surface, The first member is joined to the second member such that the concavo-convex portion of the first member and the concavo-convex portion of the second member are relatively overlapped.

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