WO2022185739A1

WO2022185739A1 - Method for producing junction and junction

Info

Publication number: WO2022185739A1
Application number: PCT/JP2022/001293
Authority: WO
Inventors: 卓唯李
Original assignee: オムロン株式会社
Priority date: 2021-03-05
Filing date: 2022-01-17
Publication date: 2022-09-09
Also published as: JP2022135654A; TW202235193A

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 manufacturing conjugate, and conjugate

The present disclosure relates to a method for manufacturing a joined body and a joined body.

Conventionally, as a method of joining a plurality of members made of different materials, a method of irradiating a laser beam on the interface between the members to melt the materials by contact heat transfer and join them is known. 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 a laser beam. Then, the member containing the resin is melted by the heat transmitted from the member containing the material other than the resin, and then the resin is solidified to perform the bonding.

For example, in Patent Document 1, a first member that transmits a laser beam and a second metallic member that has an uneven boundary surface with fine holes having a diameter of 1 μm or less are superimposed on each other to produce a laser beam. A method for joining members has been proposed in which the irradiation is performed.

Further, in Patent Document 2, 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 a laser beam, and the second member is filled into the perforated portion. There has been proposed a method of joining members by applying and solidifying.

Japanese Patent Application Laid-Open No. 2010-274279 Japanese Patent Application Laid-Open No. 2016-43561

The inventions according to

Patent Documents

1 and 2 join members by contact heat transfer. However, in that case, a member containing a material other than resin (corresponding to the second member of the present disclosure) requires high flatness. If the flatness of the member containing a material other than resin is low (for example, 200 μm or more), the heat transfer from the concave portion at the joint portion will be insufficient. As a result, a gap is generated between the members after bonding, and the bonding sealing performance of the bonded body is deteriorated. Although the flatness of the member to be melted can be improved by performing laser scanning for a long period of time, productivity is reduced in that case.

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

In one aspect, the present disclosure has been made in view of such circumstances, and an object of the present disclosure is to provide a method for manufacturing a bonded body that can achieve both productivity and bonding sealing properties of the resulting bonded body. It is to be.

The present disclosure adopts the following configuration in order to solve the above-mentioned problems.

That is, a method for joining a joined body according to one aspect of the present disclosure includes the following steps (A) to (C): (A) forming an uneven portion on the surface of a first member containing a resin having laser transparency; (B) forming uneven portions on the surface of a second member containing a material other than resin; and (C) overlapping the uneven portions of the first member and the uneven portions of the second member so as to face each other. and irradiating a laser beam from the first member side to join the first member and the second member.

In addition, a joined body according to one aspect of the present disclosure includes a first member that includes a laser-transmitting resin and has an uneven surface on the surface, and a second member that includes a material other than resin and has an uneven surface on the surface. and the first member and the second member are joined in such a manner that the concave and convex portions of the first member and the concave and convex portions of the second member are overlapped so as to face each other.

According to the present disclosure, it is possible to provide a method for manufacturing a joined body that can achieve both productivity and sealing properties of the resulting joined body.

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

An embodiment (hereinafter also referred to as "the present embodiment") according to one aspect of the present disclosure will be described below with reference to the drawings.

§1 Application Example First, an outline of a method for manufacturing a joined body according to an aspect of the present disclosure will be described with reference to FIG. FIG. 1 is a cross-sectional view showing a method of manufacturing a joined body according to one aspect of the present disclosure.

As shown in FIG. 1, the method for manufacturing a joined body according to the present embodiment includes an uneven portion 21 of a first member 1 containing a resin having laser transparency, and an uneven portion 22 of a second member 2 containing a material other than resin. are superimposed on each other so as to face each other, and the bonding portion 4 is irradiated with a laser beam 3 to bond them. The manufacturing method of the joined body in the present embodiment comprises the following steps (A) to (C): (A) a step of forming an uneven portion 21 on the surface of the first member 1 containing a resin having laser transparency; ) forming uneven portions 22 on the surface of the second member 2 containing a material other than resin; and (C) overlapping the uneven portions 21 of the first member and the uneven portions 22 of the second member so as to face each other and irradiating the laser beam 3 from the first member 1 side to join the first member 1 and the second member 2 together.

The uneven portion 21 of the first member formed in step (A) absorbs the laser light 3 in a short time and softens or melts, so the laser scanning time during bonding can be shortened. In addition, the uneven portion 21 of the first member solidifies at the joint portion 4 in such a manner that it is fitted into the uneven portion 22 of the second member formed in the step (B), thereby forming a bonded body. It is possible to provide a bonded body excellent in

§2 Configuration example [Manufacturing method of joined body]
<Step (A)>
The step (A) in the method for manufacturing a joined body according to an embodiment of the present disclosure (hereinafter also referred to as the present manufacturing method) includes forming an uneven portion on the surface of a first member containing a resin having laser transparency. It is a process. Since the irregularities are formed on the surface of the first member, the laser light is transmitted through areas other than the irregularities of the first member during bonding in step (C), which will be described later, and the laser light is absorbed by the irregularities of the first member. be done. In other words, the concave-convex portion of the first member can also be said to be a concave-convex portion capable of absorbing laser light. Therefore, only the uneven 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 sealing properties.

Any method may be used to form the uneven portion of the first member. Examples of such arbitrary forming methods include laser processing, processing using sandpaper, molding using ultra-precision molds, and fine cutting.

Examples of the laser used for forming the uneven portion of the first member include _CO2 laser, fiber laser, YAG laser, YVO4 laser, semiconductor laser, excimer laser, and the like. From the viewpoint of the laser absorption characteristics of the concave and convex portions of the first member, it is preferable to use a CO ₂ laser. Also, the laser irradiation conditions can be appropriately changed according to the desired shape of the uneven portion of the first member. That is, the laser may be, for example, a continuous wave or a pulsed wave.

(First member)
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 PVC (polyvinyl chloride), PS (polystyrene), AS (acrylonitrile-styrene), ABS (acrylonitrile-butadiene-styrene), PMMA (polymethyl methacrylate), PE (polyethylene), PP ( polypropylene), PC (polycarbonate), m-PPE (modified polyphenylene ether), PA6 (polyamide 6), PA66 (polyamide 66), POM (polyacetal), PET (polyethylene terephthalate), PBT (polybutylene terephthalate), PSF (polysulfone) ), PAR (polyarylate), PEI (polyetherimide), PPS (polyphenylene sulfide), PES (polyethersulfone), PEEK (polyetheretherketone), PAI (polyamideimide), LCP (liquid crystal polymer), PVDC (polyvinylidene chloride), PTFE (polytetrafluoroethylene), PCTFE (polychlorotrifluoroethylene), and PVDF (polyvinylidene fluoride). TPE (thermoplastic elastomer) may also be used. Examples of TPE include TPO (olefin-based), TPS (styrene-based), TPEE (ester-based), TPU (urethane-based), TPA (nylon-based), and TPVC (vinyl chloride). Examples of the thermosetting resin include EP (epoxy), PUR (polyurethane), UF (urea formaldehyde), MF (melamine formaldehyde), PF (phenol formaldehyde), UP (unsaturated polyester), and SI (silicone). It may also be FRP (fiber reinforced plastic). Examples of FRP include CFRTP (carbon fiber reinforced thermoplastic resin). Among these, PMMA is preferable from the viewpoint of excellent workability and strength.

FIG. 3 schematically shows the first member 1 used in the 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 position of the uneven portion 21 are not particularly limited, and can be changed as appropriate. As in the example shown in FIG. 3, on the surface of the first member 1, the uneven portion 21 of the first member is formed.

The laser absorptance of the uneven portion of the first member is preferably 10% or more, more preferably 20% or more, and even more preferably 30% or more. Although the upper limit of the laser absorptance is not particularly limited, it may be, for example, 100% or less. When the laser absorptance is within the above range, the irregularities of the first member and their surroundings are more easily softened or melted in the step (C) described later, so that the bonding sealing property of the resulting bonded body is improved. do.

For example, the laser absorptance may be calculated using the following formula after measuring the laser transmittance using a laser power meter. Alternatively, the absorptivity may be directly measured using an integrating sphere or the like.

100 (%) - transmittance (%) = laser absorption (%)
On the other hand, the laser absorptance of the first member other than the irregularities is preferably less than 10%, more preferably 9% or less, and even more preferably 8% or less. If the laser absorptivity of the portion other than the uneven portion of the first member is within the above range, the laser beam is likely to concentrate on the uneven portion of the first member, and the productivity of the resulting joined body is improved.

The processed shape of the uneven portion of the first member is not particularly limited. For example, the uneven portion may have a plurality of grooves, a plurality of perforations, or an irregular shape.

6 to 8 illustrate the shapes of the uneven portions 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 in which a plurality of regular perforations are formed. In this specification, the shape shown in FIG. 7 is also called "point cloud shape" for convenience. The shape shown in FIG. 8 is a shape having irregular unevenness. In this specification, the shape shown in FIG. 8 is also called "random shape" for convenience. The uneven portion of the first member may be partially formed with a plurality of types of shapes. That is, for example, the shape shown in FIG. 6 and the shape shown in FIG. 7 may coexist.

The ratio of the depth of the uneven portion of the first member to the flatness tolerance of the uneven portion of the second member is preferably 50% or more, more preferably 80% or more, and 100% or more. is more preferable, and 120% or more is most preferable. The upper limit of the ratio of the depth of the uneven portion of the first member to the flatness tolerance of the uneven portion of the second member is not particularly limited, but may be, for example, 200% or less. If the depth of the irregularities of the first member is within the above range, the first member softened or melted by the laser can be sufficiently filled into the irregularities of the second member, so that the bonding sealing of the joined body can be achieved. Improved stopping performance.

The depth of the uneven portion of the first member will be described below with reference to FIG. FIG. 2 is an enlarged schematic diagram of an example of a portion where the concave-convex portion of the first member and the concave-convex portion of the second member are overlapped so as to face each other, that is, an example of the joint portion. In the example shown in FIG. 2, the depth 11 of the first member unevenness means the vertical distance from the surface of the first member 1 at the joint to the bottom of the first member unevenness. That is, when the shape of the uneven portion of the first member is a point group shape, it means the vertical distance from the opening of the perforation to the bottom. Further, when the uneven portion of the first member is groove-shaped, it means the vertical distance from the surface of the first member to the bottom of the groove. Furthermore, when the unevenness of the first member has a random shape, it means six times the standard deviation of the depth of the unevenness at a plurality of randomly selected measurement points. The number of measurement points for measuring the depth may be, for example, 100 points or more from the viewpoint of improving the accuracy of measurement. When a plurality of shapes coexist in the uneven portion of the first member, the average value of each shape may be used. The unevenness depth of the first member can be measured by, for example, a non-contact optical three-dimensional shape measuring device.

Further, in this specification, the flatness tolerance 12 of the second member is the sum of the depth of the uneven portion of the second member measured by a non-contact optical three-dimensional shape measuring device and the flatness originally possessed by the second member. means value. The depth of the uneven portion of the second member can be defined similarly to the depth of the uneven portion of the first member.

The depth of the irregularities of the first member can be adjusted by changing the number of laser scans. For example, if the number of laser scans is increased, the depth of the concave-convex portion is increased, and if the number of laser scans is decreased, the depth of the concave-convex portion is decreased.

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

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

<Step (B)>
The step (B) in this manufacturing method is a step of forming an uneven portion on the surface of the second member containing a material other than resin. By this step, the softened or melted first member can be firmly bonded to the second member in step (C) described later, so that the strength of the resulting joined body is improved.

The method of forming the uneven portion of the second member is not particularly limited, and examples thereof include laser processing, processing with sandpaper, electric discharge processing, molding with ultra-precision molds, micromachining, and electrochemical processing.

Examples of lasers used for forming the uneven portions of the second member include fiber lasers, YAG lasers, YVO4 lasers, semiconductor lasers, _CO2 lasers, excimer lasers, and the like. From the viewpoint of being able to process the second member efficiently, it is preferable to use a fiber laser. Moreover, when using a fiber laser, it is possible to irradiate a laser in which one pulse is composed of a plurality of sub-pulses.

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

(Second member)
The second member contains a material other than resin. The material included in the second member is not particularly limited as long as it can be used for the joined body of the present disclosure. Such materials include, for example, metals, stones, glasses, ceramics, and the like.

Among the materials mentioned above, 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. Also, the method for molding the second member is not particularly limited, and may be machine cutting, metal molding, zinc die casting, aluminum die casting, powder metallurgy, casting, or the like.

If the second member contains metal, it is highly durable, easy to process, and has electrical conductivity, making it easier to use the resulting joined body in electronic devices and the like.

FIG. 4 schematically represents the second member used in the examples described later. The second member 2 shown in FIG. 4 is merely an example, and the shape, size, and formation position of the uneven portion of the second member 2 are not particularly limited, and can be changed as appropriate. As in the example shown in FIG. 4, on the surface of the second member 2, the uneven portion 22 of the second member is formed. 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 uneven portion of the second member according to the embodiment. The shape shown in FIG. 9 corresponds to, for example, non-independent uneven shapes such as the groove shape, random shape, and combinations of these shapes described with respect to the first member described above. The shape of the concave-convex portion of the second member is not limited to the shape shown in FIG. 9, and may be an independent concave-convex shape having independent non-penetrating perforations or the like, such as a point group shape. In addition, non-independent uneven shapes and independent uneven shapes may coexist. In the present specification, the term "non-independent" means that the shape boundaries of the irregularities of the second member are not clear and the respective shapes (for example, grooves, etc.) overlap each other.

FIG. 10 schematically illustrates an example of the shape of the uneven portion of the second member according to the embodiment. It is preferable that the concave and convex portions of the second member have independent non-through perforations as shown in FIG. 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 that the boundaries between the perforations are clear. Said perforations are different from continuous grooves. Since the concave and convex portions of the second member have mutually independent non-penetrating perforations, the contact area between the second member and the first member is increased, so that the durability of the resulting joined body is improved. do.

The shape of the perforations is not particularly limited. For example, the perforations may have a constant cross-sectional diameter perpendicular to the depth direction, and at least one of regions where the diameter of the cross-section perpendicular to the depth direction expands and decreases from the opening toward the bottom. You may have one.

FIG. 11 schematically illustrates an example of the shape of the uneven portion of the second member according to the embodiment. For example, as shown in the example of FIG. 11, the perforation preferably has a shape having projections on the inner peripheral surface. Specifically, it is preferable to have a shape having a region where the diameter of the cross section perpendicular to the depth direction of the perforation is reduced, followed by a region where the diameter is increased. If the perforation has a shape with protrusions on the inner peripheral surface, the first member is more firmly joined to the second member, so that the joint interface of the resulting joined body is resistant to both shear stress and normal stress. high durability.

When the perforation has a shape with protrusions on the inner peripheral surface, it is preferable to irradiate the laser in which one pulse is composed of a plurality of sub-pulses. When the second member is irradiated with the laser, the second member is locally melted to form the 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 more likely to be deposited near the perforations. The second member deposited inside the perforation becomes a protrusion on the inner peripheral surface of the perforation. Therefore, it becomes easy to form the perforation in a shape having a projection on the inner peripheral surface. In addition, from the viewpoint that the perforations are formed perpendicular to the surface, the laser irradiation direction may be perpendicular to the surface of the second member.

The flatness tolerance of the uneven portion of the second member is not particularly limited, but may be, for example, 200 μm or less or 200 μm or more. If the flatness tolerance of the second member is 200 μm or more, the joining and sealing properties of the resulting joined body or the productivity deteriorates when a conventional joining method is used. On the other hand, with 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 uneven portions, so both bonding and sealing properties and productivity are excellent. A conjugate can be manufactured. Further, as described above, the flatness tolerance of the uneven portion of the second member may be appropriately adjusted with respect to the depth of the uneven portion of the first member.

<Step (C)>
In the step (C) in this manufacturing method, the concave-convex portion of the first member and the concave-convex portion of the second member are superimposed so as to face each other, a laser beam is irradiated from the first member side, and the first member and the second member. Through this step, the concave-convex portion of the first member is softened or melted and solidified in such a manner that it is fitted into the concave-convex portion 22 of the second member, thereby forming a joined body.

Since laser beams can be transmitted through areas other than the irregularities on the first member side, the irregularities on the first member can be efficiently softened or melted by irradiating laser light from the first member side. can.

The laser beam irradiation method for joining the first member and the second member may be performed, for example, by irradiating the joining portion with a laser spot for joining and repeatedly scanning the joining portion with the laser.

Examples of lasers used for bonding include LD lasers, fiber lasers, YAG lasers, YVO4 lasers, semiconductor lasers, _CO2 lasers, excimer lasers, and the like. An LD laser is preferable from the viewpoint of being able to easily transmit through areas other than the uneven portions of the first member and to minimize thermal effects on the first member other than the joint portion.

[Joint]
A bonded body according to an embodiment of the present disclosure (hereinafter also referred to as the bonded body) includes a resin having laser transparency, a first member having an uneven surface on the surface, and a material other than the resin, the surface having A second member having an uneven portion is provided, and the first member and the second member are joined in such a manner that the uneven portion of the first member and the uneven portion of the second member are overlapped so as to face each other. The first member and the second member of this joined body are as described above. This joined body is solidified in such a manner that the concave and convex portions of the first member are fitted into the concave and convex portions of the second member.

The present disclosure is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments is also included in the technical scope of the present disclosure.
〔summary〕

A method for joining a joined body according to one aspect of the present disclosure includes the following steps (A) to (C): (A) forming an uneven portion on the surface of a first member containing a resin having laser transparency. (B) forming uneven portions on the surface of a second member containing a material other than resin; and (C) overlapping the uneven portions of the first member and the uneven portions of the second member so as to face each other, A step of irradiating a laser beam from the side of the first member to join the first member and the second member.

In the above configuration, the surface of the first member is formed with uneven portions, thereby increasing the laser absorptance. When the concave-convex portion of the first member with an increased laser absorption rate is irradiated with a laser beam, it softens or melts in a short period of time. Therefore, the laser scanning time during bonding can be shortened. Further, the softened or melted concave-convex portion of the first member solidifies in such a manner that it is fitted into the concave-convex portion of the second member, thereby forming a joined body. Therefore, it is possible to manufacture a bonded body having excellent bonding and sealing properties.

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

In the method for manufacturing a joined body according to the above aspect, the uneven portion of the first member may have a laser absorptance of 10% or more. According to this configuration, since the concave-convex portion of the first member and its surroundings are more easily softened or melted, the bonding and sealing properties of the resulting bonded body are improved.

In the method of manufacturing a joined body according to the above aspect, the concave and convex portions of the second member may have independent non-penetrating perforations. According to this configuration, the second member has a larger area of contact with the first member due to the independent, i.e. non-overlapping, perforations in the recesses and protrusions of the second member, resulting in a joined body. The joint sealing property of is improved.

In the method of manufacturing a joined body according to the above aspect, the perforations may have a shape having protrusions on the inner peripheral surface. According to this configuration, since the first member and the second member are firmly joined by the protrusions on the inner peripheral surface of the perforation, both the shear stress and the normal stress at the joint portion of the resulting joined body are reduced. improves.

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

In this specification, the "flatness tolerance of the uneven part of the second member" means the flatness tolerance of the uneven part of the second member measured by a non-contact optical three-dimensional shape measuring device. Further, in the present specification, "the depth of the unevenness of the first member" means the vertical distance from the surface of the first member to the bottom of the unevenness of the first member. In the present specification, "the ratio to the flatness tolerance is 50% or more" means that, for example, when the flatness tolerance of the uneven portion of the second member is 200 μm, the depth of the uneven portion of the first member is 100 μm. means greater than or equal to

In addition, a joined body according to one aspect of the present disclosure includes a first member that includes a laser-transmitting resin and has an uneven surface on the surface, and a second member that includes a material other than resin and has an uneven surface on the surface. and the first member and the second member are joined in such a manner that the concave and convex portions of the first member and the concave and convex portions of the second member are overlapped so as to face each other. According to the above configuration, the bonded body is superior to the conventional bonded body in terms of productivity and bonding and sealing properties.

The present disclosure will be described in more detail below based on examples, but the present disclosure is not limited to the following examples.

[Measurement of laser absorptance]
Using a laser power meter (manufactured by Ophir Optronics), the laser transmittance of the uneven portion of the first member is measured from the opposite side of the surface on which the uneven portion of the first member is formed. Calculated.

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

[Evaluation of bonding sealing property]
The joint sealability of the joined body was evaluated by the IPX7 test and the thermal shock test.

The IPX7 test was conducted using a sealed product air leak tester MSZ-0700 series (manufactured by Fukuda Co., Ltd.) that can inspect waterproofness equivalent to IPX7.

The thermal shock test was performed using a thermal shock tester (manufactured by Espec). The thermal shock test was performed at −40° C. for 30 minutes on the low temperature side and 70° C. for 30 minutes on the high temperature side. One cycle was set to circulate once between the low temperature side and the high temperature side.

In the table, "×" indicates that the IPX7 test was not passed immediately after bonding, "○" if the IPX7 test was passed immediately after bonding, and if the IPX7 test was passed after five cycles of the thermal shock test. "⊚", and "⊚" when passing the IPX7 test after 100 cycles of the thermal shock test.

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

As shown in FIG. 3, the uneven portion 21 of the first member was formed in a region having a width of 3 mm from the outer circumference of the first member 1 . Table 1 shows the CO ₂ laser irradiation conditions during uneven processing. Moreover, the processed shape of the concave-convex portion 21 of the first member was the point group shape shown in FIG.

　Stainless steel (SUS304) was used as the second member. Concavo-convex processing was performed on the second member using a fiber laser marker MX-Z2000H (manufactured by Omron Corporation). The flatness tolerance of the uneven portion of the second member was set to 200 μm.

As shown in FIG. 4, the second member 2 has a ring-shaped joint surface with an outer diameter of 20 mm and an inner diameter of 18 mm. FIG. 12 is a schematic view of the side of the second member 2 on which the ring-shaped joint surface exists, and an enlarged view of the portion where the groove 23 is formed in the ring-shaped 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 in the ring-shaped joint surface. The concave-convex portion 22 of the second member was formed on the ring-shaped joint surface including the portion of the groove 23 . The groove 23 is formed to reproduce a flatness tolerance of about 200 μm that the second member may have. That is, the depth of the groove 23 corresponds to the flatness tolerance that the second member can have. Table 2 shows the irradiation conditions of the laser marker during uneven processing. In addition, the shape of the uneven|corrugated|grooved part 22 of a 2nd member is a non-independent shape shown in FIG.

As shown in FIG. 1, the concave-convex portion 21 of the first member and the concave-convex portion 22 of the second member were superimposed so as to be in contact with each other, and placed on a joining jig. Next, using an LD laser (manufactured by Jenoptik) from the opposite side of the uneven part 21 of the first member, an infrared laser is irradiated while applying pressure from an air cylinder built in a jig for joining, and the joining part is repeated. Bonding was performed by scanning. The irradiation conditions of the infrared laser during bonding were as shown in Table 4. The uneven portion 21 of the first member was melted by a laser, fitted into the uneven portion 22 of the second member, and solidified to obtain a joined body. FIG. 5 schematically shows the shape of the resulting joined body.

[Example 2]
The same as Example 1 except that the laser irradiation conditions for forming the uneven portion of the first member were changed as shown in Table 1, and the shape of the uneven portion of the first member was the groove shape shown in FIG. A zygote was obtained at

[Example 3]
The same as in Example 1 except that the laser irradiation conditions for forming the uneven portion of the first member were changed as shown in Table 1, and the shape of the uneven portion of the first member was changed to the random shape shown in FIG. A zygote was obtained at

[Example 4]
The laser irradiation conditions for forming the uneven portion of the second member were changed as shown in Table 1, and the shape of the uneven portion was the independent perforated portion shown in FIG. 10. Joining in the same manner as in Example 1 got a body

[Example 5]
The laser irradiation conditions for forming the uneven portion of the second member were changed as shown in Table 1, and the shape of the uneven portion was an independent perforated portion with protrusions on the inner peripheral surface shown in FIG. A conjugate was obtained in the same manner as in Example 4.

[Example 6]
A joined body was obtained in the same manner as in Example 5, except that the laser irradiation conditions for forming the uneven portions of the first member were changed as shown in Table 1. It should be noted that the uneven portion of the first member of Example 6 has a smaller number of perforations per unit area than Example 5.

[Example 7]
A joined body was obtained in the same manner as in Example 5, except that the laser irradiation conditions for forming the uneven portions of the first member were changed as shown in Table 1. It should be noted that the uneven portion of the first member of Example 7 has a smaller number of perforations per unit area than those of Examples 5 and 6.

[Example 8]
A joined body was obtained in the same manner as in Example 5, except that the laser irradiation conditions for forming the uneven portions of the first member were changed as shown in Table 1.

[Example 9]
A joined body was obtained in the same manner as in Example 5, except that the laser irradiation conditions for forming the uneven portions of the first member were changed as shown in Table 1.

[Comparative Example 1]
A joined body was obtained in the same manner as in Example 1, except that the first member was not processed to be uneven.

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

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

[Reference Example 1]
A joined body was obtained in the same manner as in Example 1, except that the first member was not subjected to uneven processing and the infrared laser irradiation conditions during joining were changed as shown in Table 4.

[Reference example 2]
A joined body was obtained in the same manner as in Example 5, except that the first member was not subjected to uneven processing, and the infrared laser irradiation conditions during joining were changed as shown in Table 4.

Table 1 shows the laser irradiation conditions for forming the uneven portions of the first member in Examples 1 to 9.

Table 2 shows the laser irradiation conditions for forming the uneven portions of the second member in Examples 1 to 9.

Table 3 shows the laser irradiation conditions for forming the uneven portions of the second member in Comparative Examples 1-3 and Reference Examples 1-2.

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

〔result〕
Table 5 shows the processing conditions for the concave and convex portions of the first member and the evaluation results of bonding sealing properties in Examples 1 to 3, Comparative Example 1, and Reference Example 1. The depth of the uneven portion of the first member was indicated as "-" when the uneven portion was not formed on the first member.

From Table 5, it was found that Examples 1 to 3, in which the first member was unevenly processed, exhibited better bonding and sealing properties than Comparative Example 1, in which the first member was not unevenly processed. . In addition, in comparison with Reference Example 1, Examples 1 to 3 had a smaller number of times of scanning with the bonding laser, but showed similar bonding sealing properties. Therefore, the joined bodies of Examples 1 to 3 were shown to be superior to the joined body of Reference Example 1 in productivity.

Table 6 shows the conditions of the concave and convex portions of Examples 4 and 5, Comparative Example 2, and Reference Example 2, and the evaluation results of bonding sealing properties.

From Table 6, Examples 4 and 5, in which the first member is unevenly processed, show better bonding and sealing properties than Comparative Examples 2 and 3, in which the first member is not unevenly processed. Do you get it. In addition, compared with Reference Example 2, even when the number of scanning times of the bonding laser was small, the same degree of bonding sealing performance was exhibited. Therefore, the joined bodies of Examples 4 and 5 were shown to be superior to the joined body of Reference Example 2 in productivity.

Furthermore, Examples 4 and 5, in which the processing shape of the second member was changed to a perforated portion, showed better bonding and sealing properties than Examples 1 and 3.

Table 7 shows the conditions of the concave and convex portions of Examples 5 to 9 and the evaluation results of the bonding sealing properties.

From Table 7, it was found that Examples 5 to 9, in which the first member was unevenly processed, exhibited excellent joint sealing properties. In addition, it was found that the higher the laser absorptance of the concave and convex portions of the first member, the better the bonding and sealing properties.

One aspect of the present disclosure can be used for devices in general that require, for example, metal-to-resin bonding or metal-to-resin bonding and sealing.

REFERENCE SIGNS LIST 1 first member 2 second member 3 laser beam 4 junction 11 depth of uneven portion of first member 12 flatness tolerance of second member 21 uneven portion of first member 22 uneven portion of second member 23 groove

Claims

A method for producing a joined body, comprising the following steps (A) to (C):
(A) forming an uneven portion on the surface of the first member containing a resin having laser transparency;
(B) forming uneven portions on the surface of a second member containing a material other than resin; A step of irradiating a laser beam from the first member side to join the first member and the second member.
The method for manufacturing a joined body according to claim 1, wherein the second member contains metal.
The method for manufacturing a joined body according to claim 1 or 2, wherein the irregularities of the first member have a laser absorption rate of 10% or more.
The method for manufacturing a joined body according to any one of claims 1 to 3, wherein the concave and convex portions of the second member have independent non-penetrating perforations.
The manufacturing method of the joined body according to claim 4, wherein the perforations have a shape having protrusions on the inner peripheral surface.
The manufacturing of the joined body according to any one of claims 1 to 5, wherein the ratio of the depth of the uneven portion of the first member to the flatness tolerance of the uneven portion of the second member is 50% or more. Method.
a first member containing a resin having laser transparency and having an uneven surface on its surface;
A second member containing a material other than resin and having an uneven surface on the surface,
A joined body in which the first member and the second member are joined in such a manner that the uneven portion of the first member and the uneven portion of the second member are superimposed so as to face each other.