JP4949708B2 - Resin member joining method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joining method of a resin member which can achieve stable joining, even in a case there is a gap between the resin members to be joined together. <P>SOLUTION: The joining method of a case main body 3 and a front cover 5 in a bleeder case 1 comprises a fitting process to fit the case main body 3 which permits no permeation of laser light L into the inside of a cylindrical part 5b of the front cover 5 which permits permeation of the laser light L, and a welding process to laser-weld the front cover 5 with the case main body 3 by irradiating, with the laser light L, a lap fitting part 1a formed of the cylindrical part 5b and a fitting part 3b of the case main body 3 lap fitted into each other and a non-lap fitting part 1b, of the case main body 3, which is adjacent to the lap fitting part 1a. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to a resin member joining method in which resin members are laser-welded to each other.

Conventionally, joining techniques described in the following Patent Documents 1 to 3 are known as techniques in such fields. The joining method described in Patent Document 1 is a method in which laser welding is performed by fitting a laser light absorbing resin joint inside a laser light transmitting resin pipe. In this joining method, a laser beam is irradiated to an overlapping portion between a resin pipe and a resin joint that are overlapped by fitting. And this laser beam permeate | transmits the resin pipe and reaches | attains the surface of a resin joint, the resin joint and the resin pipe which contact | abuts it are fuse | melted, and both are joined.
JP-A-2005-193614 JP 2002-86567 A JP 2004-284122 A

  However, according to such a joining method, when the resin pipe and the resin joint are fitted together, if there is a gap due to a dimensional error between the two members, the two members are heated without being in close contact with each other. In some cases, poor bonding may occur. Therefore, an object of the present invention is to provide a resin member joining method capable of achieving stable joining even when there is a gap between the resin members to be joined.

The resin member bonding method according to the present invention is a resin member bonding method in which resin members are laser-welded to each other, and the laser beam is not transmitted inside the cylindrical portion of the first resin member that transmits the laser beam. A fitting step of fitting the second resin member, an overlapping portion where the cylindrical portion of the first resin member and the second resin member overlap by fitting, and a second resin member adjacent to the overlapping portion. A welding step of irradiating the non-overlapping portion with laser light and laser welding the first resin member and the second resin member. In the welding step, the first and second parts fitted in the fitting step The first and second resin members are rotated while pressing the resin members in the rotation axis direction, and the overlapping portion and the non-overlapping portion are adjacent to each other in the rotation axis direction .

  In this resin member joining method, the laser light applied to the overlapping portion in the welding process passes through the first resin member and hits the second resin member, whereby the second resin member in the overlapping portion is heated. The On the other hand, the non-overlapping portion of the second resin member adjacent to the overlapping portion is also irradiated with laser light, and this non-overlapping portion is also heated. Due to the heating of the non-overlapping portion, the second resin portion expands in the vicinity of the non-overlapping portion and the overlapping portion, so that the diameter of the second resin member in the overlapping portion expands and closely contacts the inside of the first resin member. It will be. And the 1st resin member to which the high temperature 2nd resin member contact | adhered also becomes high temperature, and both members are welded. As described above, even when there is a gap due to a dimensional error between the first and second resin members, since the two resin members are welded in close contact with each other due to the increase in the diameter of the second resin member, stable bonding is achieved. It becomes possible.

Further, in the welding step, the first and second resin members are rotated while pressing the first and second resin members fitted in the fitting step together in the rotation axis direction . According to such a joining method, it is possible to easily irradiate the entire circumferential direction of the overlapping portion with the laser light while rotating the first and second resin members, and to achieve stable joining in the entire circumferential direction. it can. Further, the bonding strength can be improved by pressing the first and second resin members together.

  In the fitting step, it is preferable that a gap is formed between the tip surface of the second resin member located in the overlapping portion and the inner wall surface of the first resin member. In this way, in the fusion process, the resin melted in the overlapping portion flows into the gap and welds the tip surface of the second resin member and the inner wall surface of the first resin member, so that the joining area increases. The bonding strength can be improved.

  According to the resin member bonding method of the present invention, stable bonding can be achieved even when there is a gap between the resin members to be bonded.

  Hereinafter, a preferred embodiment of a resin member joining method according to the present invention will be described in detail with reference to the drawings.

(First embodiment)
As shown in FIGS. 1-3, the bleeder case 1 to which the resin member joining method according to the present invention is applied houses a circuit board for driving a photomultiplier tube. The bleeder case 1 includes a resin case body (second resin member) 3 having a cylindrical cup shape having a diameter of about 17 mm, and a resin front lid (first resin) attached to the opening side of the case body 3. Resin member) 5 and a resin rear lid 7 attached to the bottom side of the case body 3. The front lid 5 has a disk-shaped base portion 5a and a cylindrical portion (tubular portion) 5b provided upright on the peripheral edge of the base portion 5a. Similarly, the rear lid 7 has a disc-shaped base portion 7a and a cylindrical portion 7b provided upright around the base portion 7a.

  In order to join the front lid 5 and the rear lid 7 to the case body 3 by using laser welding as will be described later, the front lid 5 and the rear lid 7 are resin materials that transmit laser light L used for welding. It is formed with. Further, the case body 3 is formed of a resin material that absorbs the laser light L. As materials for the case body 3, the front lid 5, and the rear lid 7, for example, polybutylene terephthalate (PBT), polyacetal (POM), or the like can be suitably used. In addition, it is more preferable that the front lid 5 and the rear lid 7 to be joined and the case body 3 are made of the same kind of material, because the familiarity at the time of welding is good and high joining strength is obtained.

  Since both the front lid 5 and the rear lid 7 are joined to the case body 3 by the same method, the explanation about the joining of the rear lid 7 is omitted, and only the method for joining the front lid 5 will be described in detail below. explain.

  A first fitting portion 5c having a height of 0.4 to 0.6 mm is formed at the tip of the cylindrical portion 5b of the front lid 5, and the first fitting is provided at the tip of the case body 3 on the opening side. A second fitting portion 3c that fits into the portion 5c is formed. In joining the case main body 3 and the front lid 5, first, the second fitting portion 3 c of the case main body 3 is fitted inside the first fitting portion 5 c of the front lid 5 (fitting process). ). In this state, the front end surface 3d of the second fitting portion 3c is located in parallel to and faces the end surface (inner wall surface) 5d of the cylindrical portion 5b of the front lid 5. Here, since the height of the second fitting portion 3c is formed slightly lower than the height of the first fitting portion 5c, the first gap s1 is provided between the tip surface 3d and the end surface 5d. Is formed.

  The case body 3 and the front lid 5 are manufactured with a certain dimensional tolerance by molding. Therefore, depending on the dimensional error between the case body 3 and the front lid 5, the second radial gap s2 between the outer side surface 3e of the second fitting portion 3c and the inner side surface 5e of the first fitting portion 5c. May occur. When such a second gap s2 occurs, welding is performed with a laser in a state where the outer side surface 3e and the inner side surface 5e are not sufficiently in close contact with each other, so that a bonding failure may occur. For this measure, the case body 3 and the front lid 5 may be produced by molding with a smaller dimensional tolerance or by a cutting method with high precision. However, such a production method is adopted because of its high cost. Have difficulty. Therefore, in this joining method, even when the second gap s2 is generated between the outer side surface 3e of the second fitting portion 3c and the inner side surface 5e of the first fitting portion 5c, stable joining can be achieved. Therefore, the case main body 3 and the front lid 5 are joined by the following welding process.

  First, as shown in FIG. 4, the fitted case body 3 and the front lid 5 are sandwiched between the jig 11 and the jig 13, and the case body 3 and the front lid 5 are pressed against each other. Next, by rotating the jigs 11 and 13 at a constant speed in this state, the case body 3 and the front lid 5 are rotated several times around the symmetry axis A of the case body 3. A laser emitting portion 15 is disposed on the side of the rotating case body 3 and the front lid 5, and the laser emitting portion 15 is in a direction orthogonal to the rotation axis A toward the case body 3 and the front lid 5. A laser beam L having a wavelength of 940 nm is emitted. Thus, since the laser L light is irradiated not in the direction parallel to the pressing direction of the case main body 3 and the front lid 5, but in the intersecting direction, the degree of freedom of irradiation is high.

  This laser beam L is irradiated to the vicinity of the overlapping portion 1a where the first fitting portion 5c of the front lid 5 and the second fitting portion 3c of the case body 3 overlap. Since this laser beam L is irradiated with a wide spot width of about 1.5 to 4 times the width of the overlapping portion 1a, not only the overlapping portion 1a but also a portion adjacent to the overlapping portion 1a A part of the laser light L is also irradiated to the non-overlapping part 1b which is a part. That is, the laser beam L from the laser emitting unit 15 is irradiated over the overlapping portion 1a and the non-overlapping portion 1b. Further, since the case body 3 and the front lid 5 rotate at a constant speed, the laser light L is uniformly applied to the entire area in the circumferential direction corresponding to the vicinity of the overlapping portion 1a. Hereinafter, for convenience of explanation, the laser beam L that is irradiated on the overlapping portion 1a is referred to as laser light L1, and the laser beam L2 that is irradiated on the non-overlapping portion 1b is referred to as laser light L2.

  Referring to FIG. 3 again, the non-overlapping portion 1b, which is a part of the case body 3, absorbs the irradiated laser beam L2 and is heated. When heat accumulates in the non-overlapping portion 1b by this heating, the case main body 3 is thermally expanded in the non-overlapping portion 1b and the second fitting portion 3c adjacent thereto, and the second fitting portion 3c is radially expanded. Expanding. On the other hand, since the material of the upper lid 5 transmits the laser beam L1, the first fitting portion 5c is not heated and hardly thermally expands. Accordingly, the outer surface 3e of the second fitting portion 3c and the inner side surface 5e of the first fitting portion 5c come into close contact with each other due to the increase in the diameter of the second fitting portion 3c.

  On the other hand, the laser beam L1 applied to the overlapping portion 1a passes through the first fitting portion 5c, reaches the outer surface 3e of the second fitting portion 3c, and heats the outer surface 3e. As described above, the outer surface 3e that has become high temperature due to this heating is brought into close contact with the inner side surface 5e of the first fitting portion 5c due to the expansion of the diameter of the second fitting portion 3c. . Further, the outer side surface 3e continues to be heated by the laser beam L1, so that the outer side surface 3e and the inner side surface 5e that are in close contact with each other are melted at a higher temperature, and both are welded.

  At this time, since the molten resin also flows out into the first gap s1, the resin that has flowed out is crushed by the pressing force from the jigs 11 and 13, and the distal end surface 3d of the second fitting portion 3c. The end surface 5d of the front lid 5 is bonded, and as a result, the bonding area is increased and the bonding strength is improved. In order to generate a series of phenomena as described above at an appropriate timing, depending on the material of the case body 3 and the front lid 5 and the dimensions of the second fitting portion 3c and the first fitting portion 5c, You may set appropriately the rotation speed of the jig | tool 11,13, a rotational speed, the output of the laser apparatus 15, etc. FIG. In this case, the output of the laser device 15 is lowered and the number of rotations is set to be large so that heat can be gradually and evenly accumulated in the second fitting portion 3c while preventing thermal decomposition of the joint portion. .

  As described above, at the time of laser beam irradiation in the welding process, the diameter of the second fitting portion 3c is increased by applying the laser light L2 to the non-overlapping portion 1b adjacent to the overlapping portion 1a, and the inner side surface 5e. And the outer surface 3e are in close contact with each other. Therefore, according to the above-described joining method, even when the second gap s2 is generated between the second fitting portion 3c and the first fitting portion 5c due to a dimensional error, the welding is performed in a state where both are in close contact with each other. Therefore, stable joining is possible. Moreover, compared with the case where the case main body 3 and the front lid 5 are joined using an adhesive, the cost of the adhesive can be reduced, and automation of assembly can be facilitated.

  Further, since the case main body 3 and the front lid 5 rotate at a constant speed, the laser light L is uniformly applied to the entire circumferential direction region of the joint, and is stable in the entire circumferential direction. Bonding is obtained. Further, since the case body 3 and the front lid 5 are pressed against each other by the jigs 11 and 13 during the irradiation of the laser beam, the bonding strength between them is improved.

  In addition, in a small resin part such as the bleeder case 1, the joining portion is small, and it is smoothly heated and thermally expanded. Therefore, the joining method is particularly preferably used for such a small resin part. it can.

(Second Embodiment)
As shown in FIG. 5, the bleeder case 21 is different from the bleeder case 1 in that the fitting portion 23c of the case body 23 and the fitting portion 25c of the front lid 25 are formed at the same height. Yes. Therefore, in the fitting process, when the fitting portion 23c and the fitting portion 25c are fitted, the tip surface 23d and the end surface 25d are in close contact with each other, and a gap corresponding to the first gap s1 of the bleeder case 1 is formed. Not.

  In the welding step, the laser beam L is irradiated with a width from the overlapping portion 21a where the fitting portion 23c and the fitting portion 25c overlap to the non-overlapping portion 21b adjacent to the overlapping portion 21a. Thus, the joining method of the first embodiment described above can also be applied to the bleeder case 21, and a second gap s22 due to a dimensional error occurs between the fitting portion 23c and the fitting portion 25c. Even in this case, the two are welded in close contact with each other, and stable bonding is possible. In addition, in this embodiment, about the structure which is the same as that of the structure described in said embodiment, or equivalent, attaches | subjects the same code | symbol to drawing, and abbreviate | omits the description.

(Third embodiment)
As shown in FIG. 6, in the bleeder case 31, the outer surface 33e of the fitting portion 33c of the case body 33 is a tapered surface, and the inner side surface 35e of the fitting portion 35c of the front lid 35 is also the outer surface 33e. It is set as the taper surface which fits. Moreover, since the height of the fitting part 33c is formed slightly lower than the height of the fitting part 35c, a gap s31 is formed between the tip surface 33d and the end surface 35d.

  In the welding step, the laser beam L is irradiated with a width from the overlapping portion 31a where the fitting portion 33c and the fitting portion 35c overlap to the non-overlapping portion 31b adjacent to the overlapping portion 31a. Thus, the joining method of the first embodiment described above can also be applied to the bleeder case 31, and even when a gap s32 due to a dimensional error occurs between the fitting portion 33c and the fitting portion 35c, They are welded in a state where they are in close contact with each other, and stable bonding is possible. In the welding process, the molten resin also flows out into the gap s31, so that the resin that has flowed out is crushed by the pressing force from the jigs 11 and 13, while the front end surface 33d of the fitting portion 33c and the front lid 35 are joined. As a result, the bonding area is increased and the bonding strength is improved. In addition, in this embodiment, about the structure which is the same as that of the structure described in said embodiment, or equivalent, attaches | subjects the same code | symbol to drawing, and abbreviate | omits the description.

(Fourth embodiment)
As shown in FIG. 7, in the bleeder case 41, the outer surface 43e of the fitting portion 43c of the case body 43 is a tapered surface, and the inner side surface 45e of the fitting portion 45c of the front lid 45 is also the outer surface 43e. It is set as the taper surface which fits. Furthermore, when the fitting portion 43c and the fitting portion 45c are fitted, the front end surface 43d of the fitting portion 43c is abutted against the end surface 45d of the fitting portion 45c, so that the case main body 43 and the front lid 45 Is positioned. Therefore, the tip surface 43d and the end surface 45d are in close contact with each other, and a gap corresponding to the first gap s1 of the bleeder case 1 is not formed.

  In the welding step, the laser beam L is irradiated with a width from the overlapping portion 41a where the fitting portion 43c and the fitting portion 45c overlap to the non-overlapping portion 41b adjacent to the overlapping portion 41a. Thus, the joining method of the first embodiment described above can also be applied to the bleeder case 41, and even when a gap s42 due to a dimensional error occurs between the fitting portion 43c and the fitting portion 45c, They are welded in a state where they are in close contact with each other, and stable bonding is possible. In addition, in this embodiment, about the structure which is the same as that of the structure described in said embodiment, or equivalent, attaches | subjects the same code | symbol to drawing, and abbreviate | omits the description.

(Fifth embodiment)
As shown in FIG. 8, in the bleeder case 51, a claw portion 55 g that protrudes inward from the inner side surface 55 e is formed at the tip of the fitting portion 55 c in the front lid 55. On the outer surface 53e of the fitting portion 53c in the case main body 53, a groove 53g that fits into the claw portion 55g is formed. Further, since the height of the fitting portion 53c is slightly lower than the height of the fitting portion 55c, a gap s51 is formed between the tip surface 53d and the end surface 55d.

  In the welding step, the laser beam L is irradiated with a width from the overlapping portion 51a where the fitting portion 53c and the fitting portion 55c overlap to the non-overlapping portion 51b adjacent to the overlapping portion 51a. Thus, the joining method of the first embodiment described above can also be applied to the bleeder case 51, and even when a gap s52 due to a dimensional error occurs between the fitting portion 53c and the fitting portion 55c. These are welded in a state where they are in close contact with each other, and stable bonding is possible. In the welding step, the molten resin also flows out into the gap s51, so that the resin that has flowed out is crushed by the pressing force from the jigs 11 and 13, and the front end surface 53d of the fitting portion 53c and the front lid 55 are crushed. As a result, the bonding area is increased and the bonding strength is improved. In addition, in this embodiment, about the structure which is the same as that of the structure described in said embodiment, or equivalent, attaches | subjects the same code | symbol to drawing, and abbreviate | omits the description.

(Sixth embodiment)
As shown in FIG. 9, in the bleeder case 61, a fitting portion 63 c is formed at the tip of the case main body 63, and in the fitting process, the fitting portion 63 c is the tip of the cylindrical portion 65 b in the front lid 65. The front lid 65 and the case main body 63 are connected by being fitted inside the portion 65c.

  In the welding step, the laser beam L is irradiated with a width from the overlapping portion 61a where the fitting portion 63c and the tip portion 65c overlap to the non-overlapping portion 61b adjacent to the overlapping portion 61a. As described above, the joining method of the first embodiment described above can also be applied to the bleeder case 61, and a gap s62 due to a dimensional error is generated between the fitting portion 63c and the front end portion 65c of the front lid 65. Even in this case, the two are welded in close contact with each other, and stable bonding is possible. In the welding step, the molten resin flows out into the gap s61 so as to adhere to the front end surface 63d of the fitting portion 63c, so that the resin that flows out joins the front end surface 63d and the inner wall surface 65d of the front lid 65. As a result, the bonding area is increased and the bonding strength is improved. In addition, in this embodiment, about the structure which is the same as that of the structure described in said embodiment, or equivalent, attaches | subjects the same code | symbol to drawing, and abbreviate | omits the description.

(Seventh embodiment)
As shown in FIG. 10, the bleeder case 71 has a quadrangular prism shape unlike the cylindrical bleeder case 1. The bleeder case 71 includes a cup-shaped case main body 73 having a fitting portion 73c and having a substantially square opening, and a front lid 75 having a square cylindrical portion 75b fitted to the fitting portion 73c. Yes.

  Even in such a polygonal bleeder case 71 in plan view, by applying the joining method of the first embodiment described above, the radial dimension of the fitting portion 73c is enlarged, and the fitting portion 73c is a cylindrical portion. It welds in the state closely_contact | adhered to the inner wall of 75b. Therefore, even when a gap (not shown) due to a dimensional error occurs between the fitting portion 73c and the cylindrical portion 75b, stable joining is possible. Further, if the fitting portion 73c and the cylindrical portion 75b are polygonal, a gap is likely to be formed between them, but the fitting portion 73c and the cylindrical portion 75b have a shape with rounded corners. The stress after the joint 73c expands can be dispersed, and the adhesion between the two is further improved. In addition, in this embodiment, about the structure which is the same as that of the structure described in said embodiment, or equivalent, attaches | subjects the same code | symbol to drawing, and abbreviate | omits the description.

(Eighth embodiment)
As shown in FIG. 11, the small CCD camera 80 has a cylindrical shape and includes a resin case 81 that houses a lens 86 and a CCD 87. The resin case 81 includes a cup-shaped case main body (first resin member) 85 having a cylindrical portion 85b and a cap 83 (second resin member). The lens 86 of the CCD camera 80 is positioned and fixed in the resin case 81 by bringing the front lens surface 86 a into contact with the edge of the opening 83 h formed in the center of the cap 83.

  The case body 85 is made of a resin material that transmits the laser light L, and the cap 83 is made of a resin material that absorbs the laser light L. As materials for the case main body 85 and the cap 83, for example, PC (polycarbonate), PPS (polyphenylene sulfide), PBT (boribylene terephthalate), or the like can be preferably used. In addition, it is more preferable that the case main body 85 and the cap 83 are made of the same material, since the familiarity at the time of welding is good and a high bonding strength is obtained.

  A fitting portion 85c into which the body portion 83c of the cap 83 is fitted is formed at the tip of the cylindrical portion 85b of the case body 85, and the cylinder portion 85b of the case body 85 is disposed in front of the body portion 83c of the cap 83. A flange 83j having the same outer diameter is provided. In the fitting process, when the body 83c of the cap 83 is fitted into the fitting 85c of the case main body 85, the flange 83j is positioned adjacent to the fitting 85c, and the fitting 85c and the body 83c. And are located on top of each other.

  In the welding step, the laser beam L is irradiated with a width from the overlapping portion 81a where the body portion 83c and the fitting portion 85c overlap to the collar portion (non-overlapping portion) 83j adjacent to the overlapping portion 81a. . Thus, the joining method of the first embodiment described above can also be applied to the resin case 81, and a gap (not shown) due to a dimensional error occurs between the trunk portion 83c and the fitting portion 85c. Even in this case, the two are welded in close contact with each other, and stable bonding is possible. In addition, the resin case of this type of small CCD camera has been conventionally bonded using an adhesive, but by using the above bonding method, the cost of the adhesive can be reduced and the assembly can be easily automated. can do.

  Further, an infrared laser beam is used as the laser beam L, a material that transmits the infrared laser beam and absorbs visible light is used as the material of the case body 85, and the infrared laser is used as the material of the cap 83. If a material that absorbs light and absorbs visible light is employed, the color of the appearance of both members can be the same black.

  In addition, in this embodiment, about the structure which is the same as that of the structure described in said embodiment, or equivalent, attaches | subjects the same code | symbol to drawing, and abbreviate | omits the description.

(Ninth embodiment)
As shown in FIG. 12, the resin case 91 of the small CCD camera 90 includes a cap (first resin member) 95 and a case main body (second resin member) 93. A fitting portion 93 c that is fitted inside the cylindrical portion 95 b of the cap 95 is formed at the opening end of the case body 93. With such a configuration, contrary to the resin case 81, a resin material that transmits the laser light L is used as the material of the cap 95, and a resin material that absorbs the laser light L is used as the material of the case body 93. Can do.

  In the welding step, the laser beam L is irradiated with a width from the overlapping portion 91a where the fitting portion 93c and the cylindrical portion 95b overlap to the non-overlapping portion 91b adjacent to the overlapping portion 91a. Thus, the joining method of the first embodiment described above can also be applied to the resin case 91, and a gap (not shown) due to a dimensional error is formed between the fitting portion 93c and the cylindrical portion 95b. Even if they occur, they are welded in a state where they are in close contact with each other, and stable bonding is possible. In addition, in this embodiment, about the structure which is the same as that of the structure described in said embodiment, or equivalent, attaches | subjects the same code | symbol to drawing, and abbreviate | omits the description.

(10th Embodiment)
A resin tube (first resin member) 105 shown in FIG. 13 is used for medical purposes. The joint (second resin member) 103 that connects the resin tubes 105 is formed with cylindrical protrusions 103c and 103c protruding forward and backward from the joint body 103a. The front and rear projections 103c and 103c are respectively fitted inside the resin tubes 105 and 105 having a circular cross section, whereby the resin tubes 105 are connected to each other. As the material of the resin tube 105 and the joint 103, PP (polypropylene) or nylon can be used. For example, both are made of PP, or both are made of nylon. It is preferable in terms of bonding strength that the tube 105 and the joint 103 are made of the same material. Here, the resin material forming the resin tube 105 is adjusted to transmit the laser beam L, and the resin material forming the joint 103 is adjusted to absorb the laser beam L.

  In the connection between the resin tube 105 and the joint 103, first, the joint protrusion 103c is inserted into the end (tubular portion) 105b of the resin tube 105 (fitting process). At this time, the front end surface 103 d of the joint body 103 a is abutted against the end surface 105 d of the resin tube 105. In the welding process, while the tube 105 and the joint 103 are pressed against each other and rotated in this state, the overlapping portion 101a is overlapped with the overlapping portion 101a where the end portion 105b of the tube 105 and the protruding portion 103c of the joint 103 overlap. The laser beam L is irradiated with a width up to the end (non-overlapping part) 101b of the joint body 103a adjacent to the joint body 103a.

  As described above, also in the connection between the tube 105 and the joint 103, the joining method of the first embodiment described above can be applied, and a gap due to a dimensional error is formed between the inner wall of the tube 105 and the protrusion 103c of the joint 103. Even when (not shown) occurs, they are welded in a state where they are in close contact with each other, and stable bonding is possible. Further, compared to a method of joining the tube 105 and the joint 103 using an adhesive, the cost of the adhesive can be reduced, automation of assembly can be facilitated, and safety is high.

  If the material of the joint 103 is hard plastic, the material of the resin tube 105 may be either hard plastic or soft plastic. If soft plastics are both used as the material of the joint 103 and the resin tube 105, the expansion of the diameter due to the thermal expansion of the protrusion 103c is absorbed by the stretchability of the resin tube and the joint in the welding process, and both are sufficiently It is because there is a possibility that it may not adhere.

  In addition, in this embodiment, about the structure which is the same as that of the structure described in said embodiment, or equivalent, attaches | subjects the same code | symbol to drawing, and abbreviate | omits the description.

  The present invention is not limited to the embodiment described above. For example, in the above-described embodiment, by using the laser beam L having a wide spot width, the laser beam is irradiated with the width from the overlapping portions 1a to 101a to the non-overlapping portions 1b to 101b. Separate laser beams may be simultaneously irradiated toward the overlapping portion and the non-overlapping portion. Further, the first resin member fitted into the second resin member in the present invention is not limited to a hollow member, and may be a solid member.

  Further, the laser light used in the welding process of the present invention may be either infrared laser light or visible laser light. If infrared laser light is used, a material that absorbs the infrared laser light is adopted as the material of the first resin member, and the infrared laser light is transmitted as the material of the second resin member. Since the material only has to be adopted, the appearance color of both members can be the same color.

It is a disassembled perspective view which shows 1st Embodiment of the bleeder case to which the joining method of the resin member which concerns on this invention is applied. It is sectional drawing of the bleeder case of FIG. It is sectional drawing which expands and shows the principal part of the bleeder case of FIG. It is a figure which shows the welding process in the joining method of the resin member which concerns on this invention. It is sectional drawing which expands and shows the principal part of 2nd Embodiment of the bleeder case to which the joining method of the resin member which concerns on this invention is applied. It is sectional drawing which expands and shows the principal part of 3rd Embodiment of the bleeder case to which the joining method of the resin member which concerns on this invention is applied. It is sectional drawing which expands and shows the principal part of 4th Embodiment of the bleeder case to which the joining method of the resin member which concerns on this invention is applied. It is sectional drawing which expands and shows the principal part of 5th Embodiment of the bleeder case to which the joining method of the resin member which concerns on this invention is applied. It is sectional drawing which expands and shows the principal part of 6th Embodiment of the bleeder case to which the joining method of the resin member which concerns on this invention is applied. It is a perspective view which shows 7th Embodiment of the bleeder case to which the joining method of the resin member which concerns on this invention is applied. It is sectional drawing which shows the resin case which is 8th Embodiment of the resin member to which the joining method of the resin member which concerns on this invention is applied. It is sectional drawing which shows the resin case which is 9th Embodiment of the resin member to which the joining method of the resin member which concerns on this invention is applied. It is sectional drawing which shows the resin tube and joint which are 10th Embodiment of the resin member to which the joining method of the resin member which concerns on this invention is applied.

Explanation of symbols

1a, 21a, 31a, 41a, 51a, 61a, 81a, 101a ... overlapping portion, 1b, 21b, 31b, 41b, 51b, 61b, 91b ... non-overlapping portion, 83j ... collar portion (non-overlapping portion), 101b ... end Parts (non-overlapping parts) 3, 23, 33, 43, 53, 63, 73, 93 ... case main body (second resin member), 83 ... cap (second resin member), 103 ... joint (second Resin member), 5, 25, 35, 45, 55, 65, 75 ... front lid (first resin member), 85 ... case body (first resin member), 95 ... cap (first resin member) 105 ... Resin tube (first resin member), 5b, 25b, 35b, 45b, 55b, 65b, 85b, 95b ... Cylindrical portion (cylindrical portion), 75b ... Cylindrical portion, 105b ... End portion (cylindrical shape) Part), A ... symmetry axis (rotation axis), L ... Light, s1, s31, s51, s61 ... gap.

Claims (2)

In the joining method of the resin member for laser welding the resin members,
A fitting step of fitting a second resin member that does not transmit the laser beam inside the cylindrical portion of the first resin member that transmits the laser beam;
The laser beam is applied to an overlapping portion where the cylindrical portion of the first resin member and the second resin member overlap each other by fitting and a non-overlapping portion of the second resin member adjacent to the overlapping portion. A welding step of irradiating and laser welding the first resin member and the second resin member,
In the welding step, while pressing the first and second resin members fitted together in the fitting step to each other in the rotation axis direction, the first and second resin members are rotated,
The overlapping part and the non-overlapping part are adjacent to each other in the rotation axis direction. In the fitting step,
2. The resin member according to claim 1, wherein a gap is formed between a front end surface of the second resin member located in the overlapping portion and an inner wall surface of the first resin member. Joining method.

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