JP6432364B2 - Manufacturing method of bonded structure - Google Patents

Description

The present invention relates to the production how the joined structure.

  Conventionally, a joint structure in which a first member and a second member made of different materials are joined is known (see, for example, Patent Document 1).

  Patent Document 1 includes a step of sandwiching a thermoplastic resin having transmission characteristics with respect to laser light and a thermoplastic resin having absorption characteristics with a contact pressure jig, and pressing the surfaces of both resins with the contact pressure jig. A positioning step, and a joining step of welding and joining these two resins by irradiating a laser beam from the thermoplastic resin side having transmission characteristics and heating the thermoplastic resin having absorption characteristics; Is disclosed.

JP 2004-223719 A

  However, in the joining method disclosed in Patent Document 1, it is necessary to sandwich both resins with a contact pressure jig and press the surfaces of both resins with the contact pressure jig before joining both resins with a laser in the joining process. There is. Therefore, for example, when a structure is formed on the surface of both resins, or when the shape of the surface of both resins is a shape that cannot be pressed by the contact pressure jig, both the resins are pressed by the contact pressure jig. It was difficult to join the two resins.

This invention is made | formed in view of this point, The place made into the objective is to press the 1st member and the 2nd member which are joined together, without using pressing devices, such as a contact pressure jig. It is to provide a manufacturing how the joint can be bonded structure.

  In order to achieve the above object, the present invention is configured as follows.

The method for manufacturing a bonded structure according to the present invention is a method for manufacturing a bonded structure in which a first member and a second member are bonded in a bonding region, and the surface of the first member and the second member Are disposed adjacent to each other, and a press engagement step is provided in which the second member is pressed against the first member by the press engagement portion provided on the second member, and a laser is applied to the joint region. A joining step of joining the first member and the second member to each other, and the pressing engagement portion is provided so as to protrude from the second member, and in the pressing engagement portion, The length from the projecting position from the second member to the position in contact with the back surface of the first member is designed to be shorter than the thickness of the first member .

  In this specification, for the sake of convenience, when the first member and the second member are disposed adjacent to each other in the pressing engagement step, the surface of the first member that faces the second member is the front surface, and the opposite surface is the back surface. To do.

  Further, in the manufacturing method of the joined structure, the first member is provided with a through hole into which the pressing engagement portion is inserted, and in the pressing engagement step, the pressing hole is provided with the pressing hole. The second member and the first member may be engaged by inserting an engaging portion.

  Further, in the manufacturing method of the bonded structure, the press engagement portion is brought into contact with and engaged with a rear outer peripheral portion of the first member, and in the press engagement step, the press engagement is performed. The second member and the first member may be engaged by bringing a portion into contact with the outer peripheral portion of the back surface of the first member.

  Moreover, it is a manufacturing method of the said joining structure, Comprising: The concave part formation process which forms the concave part with which the said 2nd member is filled in the said joining area | region of the said 1st member before the said press engagement process. It may be provided.

  Moreover, it is a manufacturing method of the said junction structure, Comprising: In the said recessed part formation process, you may form the said recessed part by irradiating the laser with which 1 pulse consists of several subpulses.

  Moreover, it is a manufacturing method of the said joining structure, Comprising: A metal, a thermoplastic resin, or a thermosetting resin may be used for the said 1st member.

  In the method for manufacturing the bonded structure, a resin that transmits a laser may be used for the second member.

  Further, in the manufacturing method of the bonded structure, the area length of the area where the pressing engagement portion is in contact with the back surface of the first member is designed to be substantially equal to the area length of the bonded area. Also good.

According to the present invention, the first and second members are joined together, we can provide a manufacturing how the joined structure that can be joined by pressing without using a pressing device such as a contact jig.

It is explanatory drawing explaining 1st Embodiment of the press engagement process in the manufacturing method of the junction structure which concerns on this invention. It is explanatory drawing explaining 1st Embodiment of the joining process in the manufacturing method of the joining structure which concerns on this invention. It is a figure which shows 1st Embodiment of the junction structure which concerns on this invention, Comprising: (a) is sectional drawing, (b) is a top view, (c) is a bottom view. It is sectional drawing which shows the modification of the press engagement part in the joining structure which concerns on this invention. It is sectional drawing which shows the other modification of the press engagement part in the joining structure which concerns on this invention. It is a figure which shows the Example of 1st Embodiment of the junction structure which concerns on this invention, Comprising: (a) is a perspective view, (b) is a principal part expanded sectional view of (a). It is explanatory drawing explaining 2nd Embodiment of the press engagement process in the manufacturing method of the junction structure which concerns on this invention. It is explanatory drawing explaining 2nd Embodiment of the joining process in the manufacturing method of the junction structure concerning the present invention. It is sectional drawing of 2nd Embodiment of the joining structure which concerns on this invention. It is a figure which shows the Example of 2nd Embodiment of the junction structure which concerns on this invention, Comprising: (a) is a perspective view, (b) is a principal part expanded sectional view of (a).

(First embodiment)
Hereinafter, the joining structure 1 and the manufacturing method of the joining structure 1 according to the first embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is an explanatory view for explaining a pressing engagement process, FIG. 2 is an explanatory view for explaining a joining process, FIG. 3 is a view showing a first embodiment of a joined structure, and (a) Sectional view, (b) is a plan view, (c) is a bottom view, FIG. 4 is a sectional view showing a modification of the press engagement portion in the joint structure, and FIG. 5 is a press engagement in the joint structure. Sectional drawing which shows the other modification of a part, FIG. 6 is a figure which shows the Example of 1st Embodiment of a joining structure, Comprising: (a) is a perspective view, (b) is the principal of (a). FIG. In the cross-sectional view, the cross-sectional hatching is omitted in consideration of the visibility of the drawing.

−Composition structure−
First, the bonded structure 1 according to the first embodiment of the present invention will be described.

  In the joint structure 1 of the present embodiment, the first member 2 and the second member 3 are joined in the joint region BF, and the second member 3 is engaged with the first member 2 to thereby join the joint region. A pressing engagement portion 30 that presses the second member 3 against the first member 2 by the BF is provided (see, for example, FIGS. 3A to 3C).

  The first member 2 is a metal, and examples of the metal include iron metal, stainless steel metal, copper metal, aluminum metal, magnesium metal, and alloys thereof. Moreover, a metal molding may be sufficient and zinc die-casting, aluminum die-casting, powder metallurgy, etc. may be sufficient.

  A through hole 23 is formed in the first member 2 (metal) (see, for example, FIG. 1). The size of the opening diameter of the through hole 23 is such that a pressing engagement portion 30 of a second member 3 (flexible resin) described later can be inserted. In addition, the shape of the through hole 23 is preferably a circular shape from the viewpoint of equalizing the pressing force because the pressing engagement portion 30 is inserted and the second member 3 is pressed against the first member 2, but the shape is limited to this shape. Is not something

  The periphery of the through hole 23 on the surface of the first member 2 is a bonding region BF, and a plurality of concave portions 21 having openings are formed in the bonding region BF (for example, FIG. b)). In the illustrated example, the concave portion 21 is a non-through hole having a substantially circular shape when viewed in cross section, but is not limited to this shape.

  The opening diameter of the concave portion 21 is preferably 30 μm or more and 100 μm or less. This is because when the opening diameter is less than 30 μm, the irradiated bonding laser is not sufficiently confined in the concave portion 21 in the bonding step described later, and the conversion efficiency for converting the energy of the bonding laser into heat is increased. This is because it may decrease. On the other hand, when the opening diameter exceeds 100 μm, the number of the concave portions 21 per unit area decreases, and the conversion efficiency for converting the energy of the laser for bonding into heat may decrease. Moreover, it is preferable that the depth of the recessed part 21 is 10 micrometers or more. This is because if the depth is less than 10 μm, the conversion efficiency for converting the energy of the laser for bonding into heat may decrease.

  The interval between the concave portions 21 (the distance between the center of the predetermined concave portion 21 and the center of the concave portion 21 adjacent to the predetermined concave portion 21) is preferably 200 μm or less. This is because if the interval between the concave portions 21 exceeds 200 μm, the number of the concave portions 21 per unit area decreases, and the conversion efficiency for converting the energy of the laser for bonding into heat may decrease. . An example of the lower limit of the interval between the concave portions 21 is a distance at which the concave portions 21 are not overlapped and crushed. Moreover, it is preferable that the space | interval of the recessed part 21 is equal intervals. This is because when the concave portions 21 are equidistant, the heat distribution when the bonding laser is irradiated is isotropic.

  The first member 2 and the second member 3 are joined to each other by filling the concave portion 21 with a second member 3 described later. Here, the concave portion 21 of the present embodiment is formed with a protruding portion 22 that protrudes inward. Thus, when the protrusion part 22 which protrudes inside is formed in the internal peripheral surface of the recessed part 21, if the 2nd member 3 is filled into the recessed part 21, it will be 1st according to the anchor effect by the protrusion part 22. The bonding strength between the member 2 and the second member 3 can be increased. Note that the protrusion 22 may not be formed in the concave portion 21.

  The second member 3 is a flexible resin that transmits laser, and is a thermoplastic resin or a thermosetting resin. Examples of thermoplastic resins 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 ( Riamidoimido), LCP (liquid crystal polymer), PVDC (polyvinylidene chloride), PTFE (polytetrafluoroethylene), PCTFE (polychlorotrifluoroethylene), and include PVDF (poly (vinylidene fluoride)) it is. TPE (thermoplastic elastomer) may also be used, and examples of TPE include TPO (olefin-based), TPS (styrene-based), TPEE (ester-based), TPU (urethane-based), TPA (nylon-based), And TPVC (vinyl chloride type) is mentioned.

  Examples of thermosetting resins include EP (epoxy), PUR (polyurethane), UF (urea formaldehyde), MF (melamine formaldehyde), PF (phenol formaldehyde), UP (unsaturated polyester), and SI (silicone) Is mentioned. Further, it may be FRP (fiber reinforced plastic).

  Note that a filler may be added to the thermoplastic resin and the thermosetting resin. Examples of the filler include inorganic fillers (glass fibers, inorganic salts, etc.), metal fillers, organic fillers, and carbon fibers.

  The second member 3 is provided with a pressing engagement portion 30 that engages with the first member 2 to press the second member 3 against the first member 2 in the joining region BF (see, for example, FIG. 1). . In the present embodiment, the pressing engagement portion 30 protrudes near the center of the second member 3, but the position where the pressing engagement portion 30 protrudes is not limited to this example. Further, the number of the press engagement portions 30 is not limited to one, and a plurality of the press engagement portions 30 may be formed.

  The pressing engagement portion 30 includes a flange portion 32 that engages with the first member 2 and a connecting portion 31 that connects the flange portion 32 and the second member 3.

  The flange portion 32 is a guide for easy insertion when the pressing engagement portion 30 is inserted into the through hole 23, and has a conical shape in the illustrated example (see FIG. 3A). In addition, the length LF of the collar portion 32 in the illustrated example is designed to be substantially equal to the region length of the bonding region BF. That is, the region length of the region where the pressing engagement portion 30 is in contact with the back surface of the first member 2 is designed to be substantially equal to the region length of the joining region BF.

  The corner portion r of the collar portion 32 is a round corner. In this way, by making the corner portion r of the collar portion 32 round, as compared with the case where the corner portion is an acute angle, the influence of the burr of the corner portion, the influence of the molding system (the shape of the corner portion is excellent, that is, It is possible to reduce pressing variation due to flatness necessary for uniform pressing. That is, it is possible to easily press the second member 3 against the first member 2 in the pressing engagement step of the manufacturing method of the joined structure 1 described later.

  The connecting portion 31 is in close contact with the through hole 23 and has a cylindrical shape in the illustrated example. The length l of the connecting portion 31 is designed to be shorter than the thickness t of the first member 2 (see, for example, FIG. 1). That is, the length l from the protruding position from the second member 3 to the position where the pressing engagement portion 30 contacts the back surface of the first member 2 is designed to be shorter than the thickness t of the first member 2. Yes.

  The shape of the press engagement portion 30 is a split pin shape in which the center portion of the press engagement portion 30 is broken as shown in FIG. 4 or a rivet shape in which the collar portion 32 is flat head as shown in FIG. May be.

  In the present embodiment, the first member 2 has been described as a metal, but is not limited to this example, and may be a thermoplastic resin or a thermosetting resin. When a thermoplastic resin or a thermosetting resin is used for the first member 2, when the laser is irradiated toward the bonding region BF in the bonding step of the manufacturing method of the bonded structure 1 described later, Since the member 2 and the second member 3 are melted and joined to each other, the first member 2 and the second member 3 can be joined without providing the first member 2 with the concave portion 21. In addition, even if it is a case where a thermoplastic resin or a thermosetting resin is used for the 1st member 2, you may provide the recessed part 21, and when the recessed part 21 is provided with the protrusion part 22, by an anchor effect, The first member 2 and the second member 3 can be joined more firmly.

-Manufacturing method of bonded structure-
Next, a method for manufacturing the bonded structure 1 according to the present embodiment will be described.

  The manufacturing method of the junction structure 1 according to the present embodiment includes a concave portion forming step, a pressing engagement step, and a joining step. Hereinafter, each step will be described.

-Recessed part formation process A recessed part formation process is a process of forming the recessed part 21 with which the 2nd member 3 is filled in the joining area | region BF of the surface of the 1st member 2. As shown in FIG. In the present embodiment, the first member 2 will be described as a metal, and the second member 3 will be described as a resin.

  The concave portion 21 is formed by a method such as laser processing, blast processing, sandpaper processing, anodizing processing, electric discharge processing, etching processing, or press processing. In the present embodiment, a method for forming the concave portion 21 by laser processing will be described in detail.

The type of processing laser that forms the concave portion 21 is preferably a laser capable of pulse oscillation, and can be selected from a fiber laser, a YAG laser, a YVO ₄ laser, a semiconductor laser, a carbon dioxide gas laser, and an excimer laser, and considers the wavelength of the laser. Then, a fiber laser, a YAG laser, a second harmonic of a YAG laser, a YVO ₄ laser, and a semiconductor laser are preferable. The concave portion 21 is a non-through hole having a substantially circular shape when viewed in cross section, and a plurality of the concave portions 21 are formed on the surface of the first member 2 (for example, see FIG. 3B).

  As an example of an apparatus for forming the concave portion 21, there can be mentioned a fiber laser marker MXZ2000 or MX-Z2050 manufactured by OMRON. With this fiber laser marker, it is possible to irradiate a laser where one pulse is composed of a plurality of subpulses. For this reason, the energy of the laser is easily concentrated in the depth direction, which is suitable for forming the concave portion 21.

  Specifically, when the first member 2 is irradiated with a laser, the first member 2 is locally melted, so that the formation of the concave portion 21 proceeds. At this time, since the laser is composed of a plurality of sub-pulses, the melted first member 2 is difficult to be scattered and easily deposited in the vicinity of the concave portion 21. Then, as the formation of the concave portion 21 proceeds, the melted first member 2 is deposited inside the concave portion 21, thereby forming the protruding portion 22 protruding inward on the inner peripheral surface of the concave portion 21. The

  As a processing condition by the fiber laser marker, it is preferable that one period of the sub-pulse is 15 ns or less. This is because when one period of the sub-pulse exceeds 15 ns, energy is easily diffused by heat conduction, and it becomes difficult to form the concave portion 21 having the protruding portion 22. Note that one cycle of the subpulse is a total time of the irradiation time for one subpulse and the interval from the end of the irradiation of the subpulse to the start of the irradiation of the next subpulse.

  Further, as a processing condition by the fiber laser marker, the number of subpulses of one pulse is preferably 2 or more and 50 or less. This is because if the number of subpulses exceeds 50, the output per unit of subpulses becomes small, and it becomes difficult to form the concave portion 21 having the protruding portions 22.

Press Engagement Step The press engagement step is a step of placing the surface of the first member 2 and the second member 3 adjacent to each other and pressing the second member 3 against the first member 2 by the press engagement portion 30. .

  Specifically, the flange portion 32 of the press engagement portion 30 is inserted into the through hole 23 provided in the first member 2 while being elastically deformed. Here, as described above, in this embodiment (see FIG. 2), the length l is designed to be shorter than the thickness t of the first member 2, and when the pressing engagement portion 30 is inserted into the through hole 23, Since the upper surface of the second member 3 is bent and elastically deformed so as to be a concave surface, the second member 3 can apply a pressing force due to the difference between the length l and the thickness t to the first member 2. it can.

  Note that the length LF of the flange portion of the press engagement portion 30 is substantially equal to the region length of the joining region BF.

  Thus, the second member 3 and the first member 2 can be pressed and engaged.

-Joining process A joining process is a process of irradiating the joining area BF with a laser to join the first member 2 and the second member 3 together. Specifically, in the arranging step, the first member 2 and the second member 3 are pressed and brought into contact with each other, and then a bonding laser is irradiated toward the surface of the first member 2.

Here, when the second member 3 (resin) has laser transparency, the laser irradiation may be performed by irradiating the laser from the second member 3 side or irradiating the laser from the first member 2 (metal) side. May be. On the other hand, when the 2nd member 3 (resin) does not have laser transmittance, a laser is irradiated from the 1st member 2 (metal) side. As the type of laser for bonding, fiber laser, YAG laser, YVO ₄ laser, a semiconductor laser, carbon dioxide laser, an excimer laser can be selected.

  By irradiating the bonding region BF of the first member 2 with the laser, the energy of the laser is converted into heat by the first member 2 and the temperature of the surface of the first member 2 is increased. Thereby, the second member 3 in the vicinity of the surface of the first member 2 is melted, and the second member 3 is filled in the concave portion 21. At the same time, the elastic deformation of the second member 3 that has been elastically deformed in the above-described pressing engagement process is relaxed by the melting of the second member 3. That is, the concave shape of the upper surface of the second member 3 is relaxed.

  Then, the 2nd member 3 is solidified, and the joining structure 1 with which the 2nd member 3 was joined to the 1st member 2 can be manufactured (refer Fig.3 (a)).

  Here, when irradiating the bonding region BF of the first member 2 with the laser, the laser may be scanned in the bonding region BF, and the scanning may be performed a plurality of times along the same locus. In this case, since the laser scanning is performed a plurality of times along the same locus, the temperature of the first member 2 rises, and the second member 3 and the first member 2 can be joined more effectively.

  In the present embodiment, the first member 2 has been described as a metal, but is not limited to this example, and may be a thermoplastic resin or a thermosetting resin. When a thermoplastic resin or a thermosetting resin is used for the first member 2, the first member 2 and the second member 3 are melted together when the laser is irradiated toward the bonding region BF in the bonding process. Therefore, the first member 2 and the second member 3 can be joined without providing the concave portion 21 on the first member 2 (that is, the concave portion forming step may not be performed). In addition, when the recessed part 21 is provided in the 1st member 2 (namely, when a press engagement process and a joining process are performed after performing a recessed shape formation process), the 1st member 2 is more firmly by an anchor effect. And the second member 3 can be joined.

-Experimental example of joint structure-
Next, an experimental example performed to confirm the effect of the first embodiment described above will be described with reference to FIG.

  In this experimental example, a bonded structure according to Examples 1-1 and 1-2 and Comparative Examples 1-1 and 1-2 of the bonded structure corresponding to the first embodiment was manufactured.

  The first member and the second member have a length of 100 mm, a width of 29 mm, and a thickness of 3 mm. The material of the first member and the material of the second member are as shown in Table 1 described later. .

  When the first member is SUS304 and the second member is PMMA (Acrylite (registered trademark) manufactured by Mitsubishi Rayon), the laser used in the bonding process is a semiconductor laser, the wavelength is 808 nm, and the oscillation mode is Continuous oscillation, laser output was 30 W, focal spot diameter was 4 mm, and scanning speed was 1 mm / sec.

  When the first member is PBT (Geranex (registered trademark) 3316 made by Wintech Polymer) and the second member is PMMA, the laser used in the bonding process is a semiconductor laser, the wavelength is 808 nm, and the oscillation The mode was continuous oscillation, the laser output was 1 W, the focal diameter was 4 mm, and the scanning speed was 1 mm / sec.

  When the first member is SUS304, the laser used in the concave portion forming step is a fiber laser, the wavelength is 1062 nm, the oscillation mode is pulse oscillation (frequency 10 kHz), the laser output is 3.8 W, and the scanning speed is 650 mm / sec, the number of scans was 20, the irradiation interval was 65 μm, and the number of subpulses was 20.

  When the first member is PBT, the laser used in the concave portion forming step is a fiber laser, the wavelength is 1062 nm, the oscillation mode is pulse oscillation (frequency 10 kHz), the laser output is 3.8 W, and the scanning speed is 650 mm / sec, the number of scans was 20, the irradiation interval was 65 μm, and the number of subpulses was 20.

  Moreover, evaluation of the joining state was performed using the electromechanical universal testing machine 5900 made from Instron. Specifically, a test is performed in the peeling direction (vertical direction) at a tensile speed of 5 mm / min, and the first member and the second member are peeled off after the test. What did not peel was evaluated as a pass / fail judgment o. The evaluation results are shown in Table 1.

[Comparative Example 1-1]
In the joined structure of Comparative Example 1-1, the first member is SUS304, the second member is PMMA resin, and the second member is not provided with a pressing engagement portion.

  In addition, the concave portion is formed in the first member in the concave portion forming step, and the bonding region is irradiated with laser in the bonding step, so that the concave portion of the first member is filled with the second member, and the first member and the first member Two members were joined.

  As a result of testing this bonded structure in the peeling direction (vertical direction) at a tensile speed of 5 mm / min, the first member and the second member were peeled off.

[Comparative Example 1-2]
In the joint structure of Comparative Example 1-2, the first member is PBT, the second member is PMMA resin, and the second member is not provided with a pressing engagement portion.

  Further, the concave portion is formed in the first member in the concave portion forming step, and the second member is filled in the concave portion of the first member by irradiating the laser in the joining step, and the first member and the second member Were joined.

  As a result of testing this bonded structure in the peeling direction (vertical direction) at a tensile speed of 5 mm / min, the first member and the second member were peeled off.

[Example 1-1]
In the joining structure 100 of Example 1-1, the first member 200 is made of SUS304, the second member 300 is made of PMMA resin, two through holes (φ5 mm) are formed in the first member 200, and the through holes are formed. Correspondingly, the pressing engagement portion 310 is provided on the second member 300.

  Further, by forming a concave portion in the first member 200 in the concave portion forming step, pressing the second member 300 against the first member 200 in the pressing engagement step, and irradiating the bonding region BF1 with a laser in the bonding step, The concave part of the first member 200 was filled with the second member 300, and the first member 200 and the second member 300 were joined in the joining region BF1.

  As a result of testing the bonded structure 100 in the peeling direction (vertical direction) at a tensile speed of 5 mm / min after cutting off the flange portion 320 of the pressing engagement portion 310 with respect to the bonded structure 100, the first member 200 and the first member The two members 300 were not peeled off.

[Example 1-2]
In the joined structure 100 of Example 1-2, the first member 200 is made of SUS304, the second member 300 is made of PMMA resin, two through holes are formed in the first member 200, and the two holes are made to correspond to the through holes. The second member 300 is provided with a pressing engagement portion 310.

  Further, by forming a concave portion in the first member 200 in the concave portion forming step, pressing the second member 300 against the first member 200 in the pressing engagement step, and irradiating the bonding region BF1 with a laser in the bonding step, The concave part of the first member 200 was filled with the second member 300, and the first member 200 and the second member 300 were joined in the joining region BF1.

  As a result of testing the bonded structure 100 in the peeling direction (vertical direction) at a tensile speed of 5 mm / min after cutting off the flange portion 320 of the pressing engagement portion 310 with respect to the bonded structure 100, the first member 200 and the first member The two members 300 were not peeled off.

  As described above, since the second member 300 includes the pressing engagement portion 310, the second member 300 can be pressed against the first member 200 by the pressing engagement step, and the subsequent joining is performed. According to the process, the joining region BF1 can be irradiated with a laser to join the first member 200 and the second member 300 in a state where they are positioned with respect to each other. Thereby, unlike the prior art, the first member 200 and the second member 300 can be accurately placed in a state where the second member 300 and the first member 200 are pressed without using a pressing device such as a contact pressure jig. Can be joined.

  In the present embodiment, the second member 300 is pressed against the first member 200 simply by inserting the pressing engagement portion 310 of the second member 300 into the through hole of the first member 200 in the pressing engagement step. Therefore, the pressing engagement process can be easily performed.

(Second Embodiment)
Hereinafter, the joining structure 1 and the manufacturing method of the joining structure 1 according to the second embodiment of the present invention will be described with reference to FIGS.

  FIG. 7 is an explanatory diagram for explaining a second embodiment of the pressing engagement process in the method for manufacturing the joined structure, and FIG. 8 is an explanatory diagram for explaining a second embodiment of the joining process in the method for producing the joined structure. FIG. 9 is a cross-sectional view of the second embodiment of the joint structure according to the present invention, FIG. 10 is a diagram showing an example of the second embodiment of the joint structure, and (a) is a perspective view, (B) is a principal part expanded sectional view of (a).

  In addition, since this embodiment only differs in the structure of the press engagement part of the joining structure 1, only the difference is demonstrated below and the same code | symbol is attached | subjected about the same component and the description is given. Is omitted.

−Composition structure−
First, the joint structure 1 according to the second embodiment of the present invention will be described.

  In the joint structure 1 of the present embodiment, the first member 2 and the second member 3 are joined in the joint region BF, and the second member 3 is engaged with the first member 2 to thereby join the joint region. The joint structure 1 includes a pressing engagement portion 30 ′ that presses the second member 3 against the first member 2 by BF. In this embodiment, the pressing engagement portion 30 ′ is the first member 2. It contacts and engages with the outer peripheral part of the back surface.

  The first member 2 is a metal, and a concave portion 21 having an opening on the surface of the first member 2 is formed at the outer peripheral end of the first member 2 (joining region BF on the surface of the first member 2). (See, for example, FIG. 9). In the illustrated example, the concave portion 21 is a non-through hole having a substantially circular shape when viewed in cross section, but is not limited to this shape.

  The second member 3 is a thermoplastic resin or a thermosetting resin, and is engaged with the first member 2, thereby pressing the second member 3 against the first member 2 in the joining region BF. 30 'is provided. In the present embodiment, a pressing engagement portion 30 ′ is formed at the outer peripheral end portion of the second member 3.

  The pressing engagement portion 30 ′ is composed of a flange portion 32 ′ that engages with the first member 2 and a connecting portion 31 ′ that connects the flange portion 32 ′ and the second member 3.

  The collar portion 32 ′ is in contact with the outer peripheral portion of the back surface of the first member 2 (see FIGS. 7 and 9). The length LF of the flange portion 32 'in the illustrated example is designed to be substantially equal to the region length of the bonding region BF. That is, the region length of the region where the press engagement portion 30 ′ is in contact with the back surface of the first member 2 is designed to be substantially equal to the region length of the joining region BF.

  The connecting portion 31 ′ is in contact with the side surface of the first member 2 (see FIGS. 7 and 9). In the illustrated example, the length l of the connecting portion 31 ′ is designed to be shorter than the thickness t of the first member 2. That is, the length l from the protruding position from the second member 3 to the position in contact with the back surface of the first member 2 in the pressing engagement portion 30 ′ is designed to be shorter than the thickness t of the first member 2. ing.

  In the present embodiment, the first member 2 has been described as a metal, but is not limited to this example, and may be a thermoplastic resin or a thermosetting resin. When a thermoplastic resin or a thermosetting resin is used for the first member 2, in the bonding step of the method for manufacturing the bonded structure described later, toward the bonding region BF of the first member 2 and the second member 3. When the laser is irradiated, the first member 2 and the second member 3 are melted and joined to each other, so that the first member 2 and the second member 3 can be joined without providing the first member 2 with the concave portion 21. can do. In addition, when the recessed part 21 is provided in the 1st member 2, the 1st member 2 and the 2nd member 3 can be joined more firmly by an anchor effect.

-Manufacturing method of bonded structure-
Next, a method for manufacturing the bonded structure 1 according to the present embodiment will be described.

  The manufacturing method of the junction structure concerning this embodiment is provided with a concave part formation process, a press engagement process, and a joining process. Hereinafter, each step will be described.

-Concave part formation process The concave part 21 with which the 2nd member 3 is filled is formed in joining area | region BF of the 1st member 2 by a concave part formation process. As described above, in the present embodiment, the concave portion 21 is formed at the outer peripheral end portion of the surface of the first member 2. At this time, when the laser is composed of a plurality of sub-pulses, the protruding portion 22 protruding inward can be formed on the inner peripheral surface of the concave portion 21.

Press Engagement Step In the press engagement step, the surface of the first member 2 and the second member 3 are disposed adjacent to each other, and the second member 3 is pressed against the first member 2 by the press engagement portion 30.

  Specifically, the collar portion 32 ′ is brought into contact with the outer peripheral end portion of the back surface of the first member 2 while being elastically deformed. Here, as described above, in the present embodiment (see FIG. 8), the length l is designed to be shorter than the thickness t of the first member 2, and the pressing engagement portion 30 ′ is connected to the back surface of the first member 2. Since the upper surface of the second member 3 is bent and elastically deformed so that the upper surface of the second member 3 becomes a convex surface, the second member 3 applies the pressing force due to the difference between the length l and the thickness t. It can be hung on the first member 2.

  Thus, the second member 3 and the first member 2 can be pressed and engaged.

-Joining process In the joining process, the first member 2 and the second member 3 are joined to each other by irradiating the joining region BF with laser.

  By irradiating the bonding region BF of the first member 2 with the laser, the second member 3 in the vicinity of the surface of the first member 2 is melted, and the second member 3 is filled in the concave portion 21. At the same time, the elastic deformation of the second member 3 that has been elastically deformed in the above-described pressing engagement process is relaxed by the melting of the second member 3. That is, the convex shape of the upper surface of the second member 3 is relaxed.

  Then, the 2nd member 3 is solidified and the junction structure 1 with which the 2nd member 3 was joined to the 1st member 2 can be manufactured (refer FIG. 9).

  In the present embodiment, the first member 2 has been described as a metal, but is not limited to this example, and may be a thermoplastic resin or a thermosetting resin. When a thermoplastic resin or a thermosetting resin is used for the first member 2, the first member 2 and the second member 3 are irradiated with a laser toward the bonding region BF in the bonding step. Since the member 2 and the second member 3 are melted and joined to each other, the first member 2 and the second member 3 can be joined without providing the concave portion 21 in the first member 2 (that is, the concave shape). It is not necessary to perform the part forming step). In addition, when the recessed part 21 is provided in the 1st member 2 (namely, when a press engagement process and a joining process are performed after performing a recessed shape formation process), the 1st member 2 is more firmly by an anchor effect. And the second member 3 can be joined.

-Experimental example of joint structure-
Next, an experimental example performed to confirm the effect of the second embodiment described above will be described with reference to FIG.

  In this experimental example, a bonded structure according to examples 2-1 and 2-2 and comparative examples 2-1 and 2-2 of the bonded structure corresponding to the second embodiment was manufactured.

  The first member and the second member have a length of 100 mm, a width of 29 mm, and a thickness of 3 mm. The materials of the first member and the second member are as shown in Table 2.

  When the first member is SUS304 and the second member is PMMA (Acrylite (registered trademark) manufactured by Mitsubishi Rayon), the laser used in the bonding process is a semiconductor laser, the wavelength is 808 nm, and the oscillation mode is Continuous oscillation, laser output was 30 W, focal spot diameter was 4 mm, and scanning speed was 1 mm / sec.

  When the first member is PBT (Geranex (registered trademark) 3316 made by Wintech Polymer) and the second member is PMMA, the laser used in the bonding process is a semiconductor laser, the wavelength is 808 nm, and the oscillation The mode was continuous oscillation, the laser output was 1 W, the focal diameter was 4 mm, and the scanning speed was 1 mm / sec.

  When the first member is SUS304, the laser used in the concave portion forming step is a fiber laser, the wavelength is 1062 nm, the oscillation mode is pulse oscillation (frequency 10 kHz), the laser output is 3.8 W, and the scanning speed is 650 mm / sec, the number of scans was 20, the irradiation interval was 65 μm, and the number of subpulses was 20.

  When the first member is PBT, the laser used in the concave portion forming step is a fiber laser, the wavelength is 1062 nm, the oscillation mode is pulse oscillation (frequency 10 kHz), the laser output is 3.8 W, and the scanning speed is 650 mm / sec, the number of scans was 20, the irradiation interval was 65 μm, and the number of subpulses was 20.

  Moreover, evaluation of the joining state was performed using the electromechanical universal testing machine 5900 made from Instron. Specifically, a test is performed in the shear direction (horizontal direction) at a tensile speed of 5 mm / min, and the first member and the second member peeled off after the test is determined as pass / fail ×, the first member and the second member What did not peel was evaluated as a pass / fail judgment o. The evaluation results are shown in Table 2.

[Comparative Example 2-1]
In the joined structure of Comparative Example 2-1, the first member is SUS304, the second member is PMMA resin, and the second member is not provided with a pressing engagement portion.

  In addition, the concave portion is formed in the first member in the concave portion forming step, and the bonding region is irradiated with laser in the bonding step, so that the concave portion of the first member is filled with the second member, and the first member and the first member Two members were joined.

  As a result of testing this bonded structure in the shearing direction (horizontal direction) at a tensile speed of 5 mm / min, the first member and the second member were peeled off.

[Comparative Example 2-2]
In the joint structure of Comparative Example 2-2, the first member is PBT, the second member is PMMA resin, and the second member is not provided with a pressing engagement portion.

  Further, the concave portion is formed in the first member in the concave portion forming step, and the second member is filled in the concave portion of the first member by irradiating the laser in the joining step, and the first member and the second member Were joined.

  As a result of testing this bonded structure in the shearing direction (horizontal direction) at a tensile speed of 5 mm / min, the first member and the second member were peeled off.

[Example 2-1]
In the joined structure 100 ′ of Example 2-1, the first member 200 ′ is SUS304, the second member 300 ′ is PMMA resin, and the second member 300 ′ is engaged with the first member 200 ′. Thus, a pressing engagement portion 310 ′ (width 5 mm, length 15 mm) that presses the second member against the first member is provided.

  In addition, a concave portion is formed in the first member 200 ′ in the concave portion forming step, the second member 300 ′ is pressed against the first member 200 ′ in the pressing engagement step, and the bonding region BF2 is irradiated with a laser in the bonding step. Thus, the concave portion of the first member 200 ′ was filled with the second member 300 ′, and the first member 200 ′ and the second member 300 ′ were joined in the joining region BF2.

  As a result of testing this bonded structure 100 ′ in the shear direction (horizontal direction) at a tensile speed of 5 mm / min, the first member 2 and the second member 3 did not peel.

[Example 2-2]
In the joining structure 100 ′ of Example 2-2, the first member 200 ′ is made of PBT, the second member 300 ′ is made of PMMA resin, and the second member 300 ′ is engaged with the first member 200 ′. Accordingly, a pressing engagement portion 310 ′ (width 5 mm, length 15 mm) that presses the second member 300 ′ against the first member 200 ′ is provided.

  In addition, a concave portion is formed in the first member 200 ′ in the concave portion forming step, the second member 300 ′ is pressed against the first member 200 ′ in the pressing engagement step, and the bonding region BF2 is irradiated with a laser in the bonding step. Thus, the concave portion of the first member 200 ′ was filled with the second member 300 ′, and the first member 200 ′ and the second member 300 ′ were joined in the joining region BF2.

  As a result of testing this bonded structure 100 ′ in the shear direction (horizontal direction) at a tensile speed of 5 mm / min, the first member 200 ′ and the second member 300 ′ were not peeled off.

  As described above, the second member 300 ′ is provided with the pressing engagement portion 310 ′, so that the second member 300 ′ can be pressed against the first member 200 ′ by the pressing engagement step. In the subsequent joining step, the joining region BF2 can be irradiated with a laser to join the first member 200 'and the second member 300' in a state where they are positioned with respect to each other. Thus, unlike the prior art, the first member 200 'and the second member are accurately obtained in a state where the second member 300' and the first member 200 'are pressed without using a pressing device such as a contact pressure jig. 300 'can be joined.

  Further, the press engagement portion 310 ′ of the second member 300 ′ is in contact with and engaged with the outer peripheral portion of the back surface of the first member 200 ′. The second member 300 ′ can be pressed against the first member 200 ′ simply by bringing the pressing engagement portion 310 ′ of the second member 300 ′ into contact with the outer peripheral portion. Therefore, the pressing engagement process can be easily performed.

  The above-described embodiments and examples of the present invention are all examples of the present invention, and are not of a nature that limits the technical scope of the present invention.

1, 100, 100 ′ Joint structure 2, 200, 200 ′ First member 21 Concave portion 22 Projection portion 23 Through hole 3, 300, 300 ′ Second member 30, 30 ′, 310 Press engagement portion 31, 31 ′ Connecting portion 32, 32 'collar r corner BF, BF1, BF2 junction region

Claims (8)

The first member and the second member are a manufacturing method of a joined structure joined in a joining region,
A pressing member that causes the surface of the first member and the second member to be disposed adjacent to each other, and causes the second member to be pressed against the first member in the joining region by a pressing engagement portion provided on the second member. Joint process,
A joining step of irradiating the joining region with a laser to join the first member and the second member to each other ; and
The pressing engagement portion protrudes from the second member,
In the pressing engagement portion, the length from the projecting position from the second member to the position in contact with the back surface of the first member is designed to be shorter than the thickness of the first member. A method for manufacturing a joined structure. A method for manufacturing a joined structure according to claim 1,
The first member is provided with a through hole into which the pressing engagement portion is inserted,
In the pressing engagement step, the second member and the first member are engaged with each other by inserting the pressing engagement portion into the through hole. A method for manufacturing a joined structure according to claim 1,
The pressing engagement portion is in contact with and engaged with the outer peripheral portion of the back surface of the first member,
In the pressing engagement step, the second member and the first member are engaged by bringing the pressing engagement portion into contact with the outer peripheral portion of the back surface of the first member. Manufacturing method. It is a manufacturing method of the joined structure given in any 1 paragraph of Claims 1-3,
Prior to the pressing and engaging step, a bonding structure forming step of forming a concave portion filled with the second member in the bonding region of the first member is provided. Method. A method for producing a joined structure according to claim 4,
In the concave portion forming step, the concave portion is formed by irradiating a laser in which one pulse is composed of a plurality of subpulses. It is a manufacturing method of the joined structure given in any 1 paragraph of Claims 1-5,
A metal, a thermoplastic resin, or a thermosetting resin is used for said 1st member, The manufacturing method of the joining structure characterized by the above-mentioned. It is a manufacturing method of the joined structure given in any 1 paragraph of Claims 1-6,
A method of manufacturing a bonded structure, wherein the second member is made of a resin that transmits laser. A method of manufacturing a has been joined structure according to any one of claims 1 to 7
A method for manufacturing a joint structure, wherein a region length of a region where the pressing engagement portion is in contact with a back surface of the first member is designed to be substantially equal to a region length of the joint region.

Images