JP2004209916A - Resin bonding method and resin component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bonding method of resin materials, which has an enough high strength to pressure and a nearly perfect welding-together can be possible even between large members having complicated shapes. <P>SOLUTION: The resin bonding method, in which the resin materials are bonded together, comprises a step (SO 3), in which the abutting end parts of the respective resin materials are abutted against each other, a step (SO 4), in which the clearance between the abutted abutting end parts is nearly extinguished, and a step (SO 5), in which the abutting end parts, the clearance formed between which is nearly extinguished, are welded together. According to this method, the clearance between the abutting end parts is extinguished after the resin materials are abutted at their abutting end parts, resulting in an enhancement of the welding strength in the welding step as high as possible. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

表１に示すように、溶着強度及び耐圧強度が振動溶着のみの場合に比べ、約１．５倍以上に向上していることが確認できた。また、レーザ光による溶着のみの場合と本実施形態との比較から判るように、レーザ光のみでは、溶着前における樹脂材どうしの間隙がどの程度であるか、樹脂材の形状がどのようなものであるか、等に大きく依存して溶着強度や耐圧強度が定まるが、振動溶着を組み合わせることにより、レーザ光による溶着によって期待可能な最大レベルの溶着強度や耐圧強度が確保できることが判った。
【００４４】
【発明の効果】
以上説明したように、本発明によれば、樹脂材が互いに当接端部において当接させられた後、その間隙をほぼ消滅させられるので、溶着工程において行われる溶着の強度を最大限に高めることができる。すなわち、従来の技術では、溶着の前における間隙を無くすための工程が存在しなかったため、当接端部間にキャップが存在している場合があった。このような状態で溶着しても、溶着における本来の耐圧強度が得られず、全体としての最大耐圧を期待通りに高めることができなかった。この点、本発明によれば、当接端部間の間隙を消滅させているため、溶着工程において得られるべき最大耐圧をいずれの溶着部位についても確保出来るようになる。
【図面の簡単な説明】
【図１】図１は、本発明の樹脂接合方法によって製造される、実施形態に係るインテークマニホールドの斜視図である。
【図２】図２は、本実施形態に係るインテークマニホールドの断面図である（図１のＡ−Ａ切断面）。
【図３】図３は、本実施形態に適用される樹脂接合方法を説明するフローチャートである。
【図４】図４は、本実施形態に適用される樹脂接合方法を説明する当接端部の拡大断面図である。
【図５】図５は、本実施形態におけるインテークマニホールドの樹脂材の組合せを説明する図である。
【図６】図６は、本実施形態におけるレーザ光の照射の様子を説明する図である。
【符号の説明】
１…インテークマニホールド、１０…ポート、１００…非光透過性樹脂材、１１０…光透過性樹脂材、１２０…当接端部、１０３、１１２…当接面、１０４…逃げ溝、１０５…溶着バリ、Ｌ…レーザ光[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a resin welding method capable of increasing bonding strength and a resin product manufactured by the method.
[0002]
[Prior art]
In the automobile manufacturing industry and the like, attempts have been made to reduce the weight and cost of a vehicle by molding a member made of metal with resin. In order to weld such a resin component, a welding method different from metal welding is required, and a friction welding method and a laser welding method are known as such welding methods.
[0003]
For example, Japanese Patent Application Laid-Open No. H11-31157 discloses a technique in which two divided bodies provided with deformation preventing ribs are vibration-welded to form a resin surge tank (Patent Document 1). Japanese Patent Application Laid-Open No. Sho 60-214931 discloses a joining method of welding superposed synthetic resin materials by a laser beam (Patent Document 2). Furthermore, Japanese Patent Application Laid-Open No. 2000-86567 discloses a technique for manufacturing an intake manifold by increasing the welding area of a plurality of resin materials and welding them with a laser beam (Patent Document 3).
[0004]
[Patent Document 1]
JP-A-11-31157 [0005]
[Patent Document 2]
JP-A-60-214931
[Patent Document 3]
Japanese Patent Application Laid-Open No. 2000-86567
[Problems to be solved by the invention]
However, in the above-described conventional friction welding and laser beam welding, the strength of the welded portion is insufficient. That is, in the friction welding disclosed in Patent Document 1, since the welded portion has a pressure resistance of about 1/3 or less of that of other portions, it is used for parts such as an internal combustion engine, for example, a surge tank or an intake manifold. If such friction welding is used for a component to perform, sufficient power performance may not be able to be secured. Further, increasing the pressure resistance by providing deformation preventing ribs as in Patent Literature 1 involves providing a structure protruding outward, which is not preferable from the viewpoint of compactness and ease of manufacturing. Was. Further, in the welding using laser light as disclosed in Patent Documents 2 and 3, if the gap between the joining surfaces can be eliminated, the pressure resistance can be increased, but it is difficult to completely eliminate the gap. For this reason, when applied to the joining of a resin material having a relatively large and complicated shape such as a member used for a vehicle, a gap required for laser welding (for example, within 0.4 mm) becomes larger due to partial deformation or distortion, In some cases, it was difficult to perform perfect welding as a whole, and the overall welding strength was sometimes reduced.
[0008]
[Means to solve the problem]
In view of the above problems, an object of the present invention is to provide a method of joining a resin material having a sufficiently high pressure resistance and capable of almost completely welding even a member having a large and complicated shape. I do.
[0009]
The present invention relates to a resin joining method for joining resin materials, wherein a step of contacting a contact end of each resin material and a step of substantially eliminating a gap between the contacted contact ends are provided. And a step of welding the contact end where the gap has almost disappeared.
[0010]
According to the above method, after the resin materials are brought into contact with each other at the contact ends, the gap is almost eliminated, so that the strength of the welding performed in the welding step can be maximized. That is, in the related art, since there was no step for eliminating the gap before welding, there was a case where a cap was present between the contact ends. Even if welding is performed in such a state, the original pressure resistance in welding cannot be obtained, and the maximum pressure resistance as a whole cannot be increased as expected. In this regard, according to the present invention, since the gap between the contact ends is eliminated, the maximum withstand pressure to be obtained in the welding step can be ensured for any of the welded portions.
[0011]
Here, the “resin material” is not limited, but needs to be a material that can be welded in the welding step. For example, when using welding by laser light or the like, one resin material is relatively easy to transmit light, the other resin material is relatively hard to transmit light, and heat generation in the other resin material can be expected. Next, select the material.
[0012]
Further, “to substantially eliminate the gap” means that there is substantially no gap between the end faces, and the joining force does not necessarily have to act between the end faces. For example, it is conceivable to generate heat by friction to soften the convex portion on the surface to substantially reduce the gap between the end faces, or to apply heat directly to soften the material to eliminate the gap between the end faces.
[0013]
Further, the “welding” is not limited, and various welding methods applicable to resin can be applied. For example, a hot air welding method, a hot plate welding method, a high frequency welding method, an ultrasonic welding method, or the like can be applied. Specifically, the resin can be melted using a heat source such as a laser beam, an arc, or plasma.
[0014]
The present invention also relates to a resin joining method for joining resin materials, wherein a step of contacting the contact ends of the respective resin materials and a step of welding the contacted end portions are performed. And a step of irradiating the welded contact end with laser light to increase the welding strength.
[0015]
According to the above method, after the resin materials are brought into contact with each other at the contact ends, the gap between the two members is almost eliminated by welding. In this state, if the laser beam is irradiated, since the gap does not exist, the intensity of the laser beam welding can be maximized. That is, in the conventional technology, only welding by friction heat or welding only by laser light was performed. However, only welding by friction heat has a low original welding strength. Due to the gap, the original pressure resistance could not be obtained. In this regard, according to this method, since the laser beam is irradiated after the gap between the contact ends is eliminated by welding due to frictional heat, the defects of both are compensated for, and the effect of synergistic increase in pressure resistance is achieved. Will play. In the welding in the present invention, various welding methods that can substantially eliminate the gap between the resin materials by a method other than the laser beam welding can be applied. For example, a hot air welding method, a hot plate welding method, a high frequency welding method, an ultrasonic welding method, or the like can be applied.
[0016]
Further, the present invention is a resin joining method for joining resin materials, wherein a step of contacting a contact end portion of each resin material and a step of forming the contacted contact end portion between the resin materials are provided. A step of welding by frictional heat; and a step of irradiating the welded contact end with a laser beam to increase the welding strength.
[0017]
According to the above method, after the resin materials are brought into contact with each other at the contact ends, frictional heat is applied, so that the two members are joined with a certain strength, and the gap between the two members is almost eliminated. In this state, if the laser beam is irradiated, since the gap does not exist, the intensity of the laser beam welding can be maximized. That is, in the conventional technology, only welding by friction heat or welding only by laser light was performed. However, only welding by friction heat has a low original welding strength. Due to the gap, the original pressure resistance could not be obtained. In this regard, according to this method, since the laser beam is irradiated after the gap between the contact ends is eliminated by welding due to frictional heat, the defects of both are compensated for, and the effect of synergistic increase in pressure resistance is achieved. Will play.
[0018]
Here, "welding by frictional heat" is not limited, but refers to welding using frictional heat or the like generated on a contact surface by relative motion between resin materials. For example, the contact end may be welded by applying vibration of a predetermined frequency to at least one of the resin materials while one resin material is pressed in the direction of the other resin material. The “laser light” is not limited, and it is sufficient that light capable of increasing local heat at the contact end and melting the resin can be supplied. For example, it is possible to use a heat source such as an arc or plasma in addition to laser light.
[0019]
Here, in the case of using laser light, it is preferable that the resin materials include a transparent resin material having relatively high light transmittance and a non-transparent resin material having relatively low light transmittance. At this time, in the step of irradiating the laser beam, the contact end is irradiated with the laser beam through the transparent resin material. According to such a method, the laser beam passes through the light-transmitting resin material without generating heat, and is applied to the non-transmitting resin material at the contact end. Since the non-transparent resin material does not transmit laser light, energy is supplied to molecules on the surface and heat is generated at the end face. This heat melts the resin material, and welding is performed.
[0020]
Further, in the step of irradiating the laser beam, the laser beam may be selectively irradiated only to a region in the contact end portion which requires a strength higher than the welding strength by welding by friction. That is, since a certain degree of pressure resistance is provided even in welding by friction, if a portion exceeding the pressure resistance of welding by friction is known, measures for increasing the welding strength by laser beam irradiation only at this portion are taken. It will be good if you keep it. By taking such measures, the time for irradiating the laser beam can be minimized, the number of steps can be reduced, and the overall manufacturing cost can be reduced.
[0021]
The present invention is also a resin component manufactured by the resin joining method according to the present invention. Here, the “resin component” is not limited, and includes any component that can be made of a material that can be welded by being partially melted, that is, a resin material having thermoplasticity. For example, parts requiring high welding strength and pressure resistance, such as a surge tank of an internal combustion engine, are mentioned as this resin part, and it is preferable to apply the resin bonding method according to the present invention to such parts.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
[0023]
In this embodiment, the resin joining method according to the present invention is applied to the manufacture of an intake manifold used for an internal combustion engine of a vehicle. FIG. 1 shows a perspective view of an intake manifold manufactured by the resin joining method of the present invention.
[0024]
As shown in FIG. 1, the intake manifold 1 has a plurality of ports 10 for supplying air to each cylinder of the internal combustion engine, and two resin materials 100 and 110 are joined at a joining end 120. It consists of. Conventionally, the intake manifold, which was made of metal, is made of resin, so that it is possible to significantly reduce weight and size, and also to achieve higher output by lowering the intake air temperature and improving the surface roughness inside the port. Play.
[0025]
FIG. 2 is a cross-sectional view of one port of the intake manifold 1 taken along the line AA in FIG. As shown in FIG. 2, the resin material 100 is molded of a non-light transmitting resin, and the resin material 110 is molded of a light transmitting resin. The non-light-transmitting resin material 100 and the light-transmitting resin material 110 are welded at the contact end 120 to provide a hollow structure that provides an air passage 121 to the internal combustion engine.
[0026]
Here, the non-light-transmitting resin material 100 is made of a plastic material that absorbs laser light as a heat source and generates heat, and the light-transmitting resin material 110 transmits laser light at a predetermined transmittance or higher. It is made of a plastic material that can be used. These resins only need to have sufficient mechanical strength and heat resistance to be used as an intake manifold. However, the non-light-transmitting resin material 100 needs to have a melting point at which welding can be performed at least in a vibration welding or laser beam welding process described later. For example, as the resin material, PA-GF30 (“30” indicates the weight (wt)% of glass fiber) made of polyamide containing glass fiber can be used.
[0027]
As shown in FIG. 4, the contact end portion 120 is formed by joining the contact end portion 101 on the non-light-transmitting resin material 100 side and the contact end portion 111 on the light-transmitting resin material 110 side. I have. The contact surface 102 at the contact end portion 101 on the non-light-transmitting resin material 100 side and the contact surface 112 at the contact end portion 111 on the light-transmitting resin material 110 side are in contact with no gap and are welded. ing. The contact end portion 101 on the side of the non-light-transmitting resin material 100 is molded so that the projection 103 of the contact surface 102 protrudes from a concave shape formed by leaving the flange 105. Therefore, a groove 104 is formed between the protrusion 103 of the contact surface 102 and the flange 102 in order to prevent the burr 106 generated during friction welding from protruding into the flow passage 121. On the other hand, the contact end portion 111 on the light transmissive resin material 110 side is provided with a protrusion 113 to form a contact surface 112. The height of the projections 103 on the non-light-transmitting resin material 100 is slightly reduced before being combined with the light-transmitting resin material 110 by friction welding described later.
[0028]
If there is a trace of friction welding at the joint and the pressure resistance is, for example, about 1/2 or more of the strength of the base material, it can be estimated that the resin joining method of the present invention is used.
[0029]
Next, a resin bonding method according to the present embodiment will be described with reference to a flowchart shown in FIG. 3, an enlarged sectional view of a contact end shown in FIG. 4, an explanatory diagram of a combination of resin materials shown in FIG. 5, and a laser beam irradiation shown in FIG. This will be described with reference to the explanatory diagram of FIG.
[0030]
First, the non-light-transmitting resin material 100 and the light-transmitting resin material 110 are molded using a known resin molding method (FIG. 3: S01 to S02). For example, resin materials 100 and 110 are manufactured by injecting a resin material into a mold for forming an intake manifold and curing the resin material by applying an injection molding method.
[0031]
At this time, a plastic material that has thermoplasticity, absorbs laser light serving as a heating source, and can be in a plastic state by irradiation with the laser light in the bonding method is used for the non-light-transmitting resin material 100. For example, polyamide (PA) such as nylon 6 (PA6) and nylon 66 (PA66), polyethylene (PE), polypropylene (PP), styrene-acrylonitrile copolymer, polyethylene terephthalate (PET), polystyrene, ABS, acrylic (PMMA) ), Polycarbonate (PC), polybutylene terephthalate (PBT), PSS, and other resin materials mixed with a colorant such as carbon black, a dye, or a pigment. As in the case of PA-GF30 described above, glass fibers, carbon fibers, and the like for reinforcement may be further added as necessary.
[0032]
Further, the light-transmitting resin material 110 is made of a plastic that has thermoplasticity, transmits laser light as a heating source at a predetermined transmittance or more, and does not cause plastic deformation during the laser light irradiation time by the bonding method. Use materials. For example, in addition to the above-mentioned PA-GF30, polyamide (PA) such as nylon 6 (PA6) and nylon 66 (PA66), polyethylene (PE), polypropylene (PP), styrene-acrylonitrile copolymer, polyethylene terephthalate (PET) ), Resin materials such as polystyrene, ABS, acrylic (PMMA), polycarbonate (PC), and polybutylene terephthalate (PBT) to which reinforcing fibers and coloring materials such as glass fibers and carbon fibers are attached as necessary. May be used.
[0033]
In addition, the combination of the non-light-transmitting resin material and the light-transmitting resin material is a combination of mutually compatible ones. For example, it is conceivable to combine resins of the same type, such as a combination of nylons 6 and nylons 66. Further, a combination of nylon 6 and nylon 66, a combination of PET and PC, a combination of PC and PBT, and the like are also compatible combinations.
[0034]
In this embodiment, a reinforced plastic (PA-GF30) obtained by adding 30 wt% of glass fiber as a reinforcing fiber to polyimide is used as the resin material of the light-transmitting resin material. As the resin material of the non-light-transmitting resin material, a reinforced plastic obtained by adding a small amount of carbon black as a coloring agent to PA-GF30 similarly containing 30 wt% of glass fiber as a reinforcing fiber is used.
[0035]
Next, as shown in FIG. 4S03 or FIG. 5, the non-light-transmitting resin material 100 and the light-transmitting resin material 110 are combined (FIG. 3: S03). Before the combination, the height of the projection 103 of the non-light-transmitting resin material 100 to the contact surface 102 is h1, the height of the projection 113 of the light-transmitting resin material 110 to the contact surface 112 is h2, Assuming that the height of the flange 105 of the resin material 100 is h3,
h1 + h2> h3
The heights of the protrusions 103 and 113 and the flange 105 are adjusted so that Therefore, when they are combined, the contact surface 102 of the non-light-transmitting resin material 100 always comes into contact with the contact surface 112 of the light-transmitting resin material 110 first. Here, as the resin molded part becomes larger and has a more complicated shape, distortion tends to occur. Therefore, even in a case where a pair of resin-made molding members are joined at a certain joining surface as in the present embodiment, there are many cases where there is a gap that is not in contact with a part that is in contact with each other. Occurs. Even if welding is performed by irradiating a laser beam with high bonding strength in such a state, complete welding cannot be performed because the gap is a certain amount (for example, 0.4 mm or more). Therefore, in the present embodiment, the gap between the pair of molded members is eliminated by the following vibration (friction) welding.
[0036]
That is, as shown in FIG. 4S04, vibration welding is performed on the contact ends 101 and 111 that have come into contact with each other (FIG. 3: S04). In this embodiment, frictional heat is generated between the two resin materials by vibration, and the frictional heat causes the protrusions 103 and 113 that are in contact with each other at the contact surfaces to be melted. Specifically, in a state where one resin material is pressed against the other resin material at a predetermined pressure (for example, 1.0 to 10 MPa), a predetermined frequency (in a direction substantially perpendicular to the pressing direction of the resin material) is applied. Vibration of a predetermined amplitude (for example, 1 to 2 mm) is applied at a frequency of, for example, 120 to 240 Hz, and the two resin materials are caused to move relative to each other to generate frictional heat at the abutting ends and to weld them. However, the welding according to the present invention is not limited to the vibration welding method as described above, but may be an ultrasonic welding method, a hot plate welding method, a high frequency induction heating welding method, or the like. In the method of applying ultrasonic waves, for example, ultrasonic waves, for example, vibration of a frequency of 20 kHz or more are applied to one of the resin materials to generate friction between the contact surfaces 103 and 113, and the heat is applied to both the contact surfaces. The resin materials on the surfaces are melted and welded to each other. Such an ultrasonic welding method has an advantage that generation of burrs can be minimized.
[0037]
When such friction welding or vibration welding is performed, the surfaces of the contact surfaces 102 and 112 are melted. Since the non-light-transmitting resin material 100 and the light-transmitting resin material 110 are combined with a constant force, when the contact surface is melted, the melted resin material is pushed out and the welding burrs 106 are deposited in the grooves 104. . That is, the welding burrs 106, which are resin chips generated by welding, and the smoke generated during welding are blocked by the flange 105. The volume of the welding burr 106 and the height of the protrusions 103 and 113 decrease.
[0038]
As a result, the sum of the height of the protrusion 103 in the non-light-transmitting resin material 100 and the height of the protrusion 113 in the light-transmitting resin material 110 is h4 (<h1 + h2 and> h3). The heights of the vibration welding (vibration amplitude or energy) and the execution time are reduced to such an extent that the height of the projections 103 and 113 is reduced by welding and the gap between the contact surfaces disappears due to such a height relationship. To adjust. The strength and execution time of such vibration welding are determined empirically and for each member. FIG. 4: When the state is as shown in S04, the gap between the contact surface 102 of the non-light-transmitting resin 100 and the contact surface 112 of the light-transmitting resin material 110 generally disappears in any part. After all, the contact surfaces are in contact with each other in all parts. The pressure resistance by such vibration welding or friction welding is generally said to be about 1/3 to 1/10 of that of the base material. In this state, the strength is not sufficient for welding to parts of a vehicle under pressure. Therefore, a measure for further increasing the strength of this welding, ie, irradiation with laser light is performed.
[0039]
However, in the present invention, the vibration welding step has a strong meaning of eliminating a gap formed between the abutting surfaces of the two resin materials, rather than a step of increasing the pressure resistance by welding. It can be said that there is no problem even if the strength is not caused by the above. In the present embodiment, the welding strength mainly depends on welding by laser beam irradiation, and the vibration welding step is sufficient if the contact surfaces can be completely brought into contact.
[0040]
After the gap between the contact surfaces disappears, laser light irradiation is performed as shown in FIG. 4: S05 and FIG. 6 (FIG. 3: S05). The laser light L is directed from the light-transmitting resin material 110 side to the contact surface 102 of the non-light-transmitting resin material 100. Based on the height h <b> 3 of the flange 105, the laser light L is emitted from an angle such that the flange 105 does not block the laser light L. The laser light L has a predetermined value of transmittance in the transparent resin material, that is, heat generated inside the transparent resin material, due to the absorption spectrum of the transparent resin material transmitting the laser light and its thickness. Is selected so as to be below the melting point of For example, it is preferable to use a YAG: Nd ³⁺ laser (wavelength: 1060 nm) or a semiconductor laser (wavelength 500 to 1000 nm). Other glass: neodymium ³⁺ laser, a ruby laser, a helium - neon laser, krypton laser, argon laser, _{H 2} laser, an _{N 2} laser, or the like. The output of the laser beam depends on the transmittance and thickness of the transparent resin material, but may be, for example, 500 W. Although the spot diameter (focal diameter) of the laser beam L also depends on the width of the contact surfaces 102 and 112, for example, a spot diameter of about 6 mm can be used.
[0041]
As shown in FIG. 6, the spot of the laser light L is moved at a moving speed enough to cause sufficient melting of the non-light-transmitting resin material, for example, at a speed of 30 mm / sec. 120 is moved along the entire circumference.
[0042]
It is said that sufficient welding strength cannot be obtained unless the gap between the contact surfaces is 0.4 mm or less. However, in this embodiment, the welding between the contact surfaces is performed before the laser beam welding step. Is performed, the non-light-transmitting resin material 100 and the light-transmitting resin material 110 of the present embodiment are welded with high pressure resistance. That is, according to this embodiment, since the welding is performed almost completely on all the contact surfaces by the irradiation of the laser beam, the pressure resistance of the welding by the laser beam or the like of 1/2 or more of the base material is substantially reduced. It is completely enjoyable.
(Example)
According to the above embodiment, PA-GF30 was used as the resin material for the intake manifold, and the two resin materials were vibration-welded. Then, the semiconductor laser was irradiated under the conditions of an output of 500 W, a spot diameter of 6 mm, and a moving speed of 30 mm / sec. Moved along the interface. As a comparative example, one manufactured only by vibration welding with the same amount of resin material was manufactured. The relative values of the welding strength and the pressure resistance by both welding methods are shown below. The relative value of the strength in the embodiment when the strength in the case of only the vibration welding which is the conventional welding method is set to 1 is shown.
[0043]
[Table 1]

As shown in Table 1, it was confirmed that the welding strength and the pressure resistance were improved about 1.5 times or more as compared with the case of only vibration welding. Further, as can be seen from a comparison between the case of only welding by laser light and the present embodiment, only the laser light indicates the gap between resin materials before welding and the shape of the resin material. The welding strength and the pressure resistance are determined largely depending on whether the welding strength or the pressure resistance is determined. However, it was found that the maximum welding strength and the pressure resistance that can be expected by the welding with the laser beam can be secured by combining the vibration welding.
[0044]
【The invention's effect】
As described above, according to the present invention, after the resin materials are brought into contact with each other at the contact end portions, the gap is almost eliminated, so that the strength of the welding performed in the welding process is maximized. be able to. That is, in the related art, since there was no step for eliminating the gap before welding, there was a case where a cap was present between the contact ends. Even if welding is performed in such a state, the original pressure resistance in welding cannot be obtained, and the maximum pressure resistance as a whole cannot be increased as expected. In this regard, according to the present invention, since the gap between the contact ends is eliminated, the maximum withstand pressure to be obtained in the welding step can be ensured for any of the welded portions.
[Brief description of the drawings]
FIG. 1 is a perspective view of an intake manifold according to an embodiment, which is manufactured by a resin bonding method of the present invention.
FIG. 2 is a cross-sectional view of the intake manifold according to the present embodiment (section taken along line AA in FIG. 1).
FIG. 3 is a flowchart illustrating a resin bonding method applied to the present embodiment.
FIG. 4 is an enlarged cross-sectional view of a contact end illustrating a resin bonding method applied to the embodiment.
FIG. 5 is a diagram illustrating a combination of resin materials of an intake manifold according to the present embodiment.
FIG. 6 is a diagram illustrating a state of laser light irradiation in the present embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Intake manifold, 10 ... Port, 100 ... Non-light-transmitting resin material, 110 ... Light-transmitting resin material, 120 ... Contact end part, 103, 112 ... Contact surface, 104 ... Escape groove, 105 ... Welding burr , L ... Laser light

Claims (7)

A resin joining method for joining resin materials,
Contacting the contact end of each of the resin materials,
A step of substantially eliminating a gap between the abutted contact ends,
Welding the contact end where the gap is substantially eliminated. A resin joining method for joining resin materials,
Contacting the contact end of each of the resin materials,
A step of substantially eliminating the gap by welding the contacted contact ends, and a step of irradiating the welded contact ends with laser light to increase the welding strength. Resin joining method. A resin joining method for joining resin materials,
Contacting the contact end of each of the resin materials,
Welding the contacted end portions by frictional heat generated between the resin materials;
Irradiating the welded contact end with a laser beam to increase welding strength. The resin joining method according to claim 3, wherein in the step of welding by the frictional heat, the contact end is welded by applying high frequency or ultrasonic waves to at least one of the resin materials. The resin materials are composed of a transmissive resin material having a relatively high light transmittance and a non-transmissive resin material having a relatively low light transmittance,
5. The resin bonding method according to claim 2, wherein in the step of irradiating the laser beam, the abutting end is irradiated with the laser beam through the transparent resin material. 6. 6. The laser beam irradiation step according to claim 2, wherein the laser beam is selectively irradiated only to a region of the contact end that requires a strength higher than a welding strength by the vibration welding. The resin joining method described in the paragraph. A resin component manufactured by the resin joining method according to claim 1.

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