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JP2005279990A - Laser beam welding method and laser beam welding structure - Google Patents

Laser beam welding method and laser beam welding structure Download PDF

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Publication number
JP2005279990A
JP2005279990A JP2004094515A JP2004094515A JP2005279990A JP 2005279990 A JP2005279990 A JP 2005279990A JP 2004094515 A JP2004094515 A JP 2004094515A JP 2004094515 A JP2004094515 A JP 2004094515A JP 2005279990 A JP2005279990 A JP 2005279990A
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Prior art keywords
joining
layer
resin material
laser welding
welding method
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JP2004094515A
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Japanese (ja)
Inventor
Hirotaka Fukatsu
啓高 深津
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Toyota Boshoku Corp
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Toyota Boshoku Corp
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Priority to JP2004094515A priority Critical patent/JP2005279990A/en
Publication of JP2005279990A publication Critical patent/JP2005279990A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1677—Laser beams making use of an absorber or impact modifier
    • B29C65/168—Laser beams making use of an absorber or impact modifier placed at the interface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1635—Laser beams characterised by the way of heating the interface at least passing through one of the parts to be joined, i.e. laser transmission welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1654—Laser beams characterised by the way of heating the interface scanning at least one of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1677—Laser beams making use of an absorber or impact modifier
    • B29C65/1683—Laser beams making use of an absorber or impact modifier coated on the article
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
    • B29C65/481—Non-reactive adhesives, e.g. physically hardening adhesives
    • B29C65/4815—Hot melt adhesives, e.g. thermoplastic adhesives
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/50—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like
    • B29C65/5057—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like positioned between the surfaces to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7841—Holding or clamping means for handling purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/342—Preventing air-inclusions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/47—Joining single elements to sheets, plates or other substantially flat surfaces
    • B29C66/474—Joining single elements to sheets, plates or other substantially flat surfaces said single elements being substantially non-flat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/863—Robotised, e.g. mounted on a robot arm
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/50—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like
    • B29C65/5007—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like characterised by the structure of said adhesive tape, threads or the like
    • B29C65/5028—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like characterised by the structure of said adhesive tape, threads or the like being textile in woven or non-woven form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/735—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the extensive physical properties of the parts to be joined
    • B29C66/7352—Thickness, e.g. very thin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • Toxicology (AREA)
  • Robotics (AREA)
  • Laser Beam Processing (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laser beam welding method which can firmly join a joining member and a laser beam welding structure. <P>SOLUTION: A connection layer 4 formed from a nonwoven fabric of a thermoplastic resin material having a high laser beam absorption factor is formed between a substrate 21 formed from a thermoplastic resin material and the welding part 31 of a bracket 3. By irradiating with laser beams, the laser beams penetrating the welding part 31 are energy-absorbed by the connection layer 4 to heat and melt the connection layer 4. Heat generated in the connection layer 4 is propagated to the joining surfaces of the adjoining substrate 21 and the welding part 31 to melt the joining surfaces. The melted substrate 21, the connection layer 4, and the welding part 31, after being mixed with each other, are joined to each other. The deflectable connection layer 4, between the substrate 21 and the welding part 31, by being pressed, follows the shapes of the joining surfaces to be welded firmly without producing a clearance between the joining surfaces. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、レーザーを照射することにより接合部を溶融させて接合する、レーザー溶接方法およびレーザー溶接構造に関する。   The present invention relates to a laser welding method and a laser welding structure in which a joint is melted and joined by irradiating a laser.

合成樹脂材料にて形成された部材同士を接合するための、レーザー溶接方法に関する従来技術として、部材間に光吸収率の高いシート状の溶加材を介在させて、この溶加材にレーザー光を照射して溶融させ、接合部材を連結するものがあった（例えば、特許文献１参照。）。これによれば、接合部材がレーザー光を透過する材料であっても、溶加材がレーザー光を吸収して溶融し、接合部材を連結することが可能であった。しかしながら、接合部材の接合面に凹凸があって、溶加材との間に隙間が発生した場合、レーザー光の照射によって溶加材が炭化する等して、溶接不良が生ずる可能性がある。この隙間を埋めるために、接合部材同士を互いに強大な荷重で挟圧するためには、巨大な押圧装置を必要とし、これが溶接時のレーザーヘッドの走査スペースを確保する上で障害となっていた。
特開平４−１５７０８２号公報（第１図） As a conventional technique related to the laser welding method for joining members formed of a synthetic resin material, a sheet-like filler material having a high light absorption rate is interposed between the members, and laser light is applied to the filler material. In some cases, the bonding member is coupled by irradiation (see, for example, Patent Document 1). According to this, even if the joining member is a material that transmits laser light, the filler material can absorb and melt the laser light and connect the joining members. However, when the joint surface of the joining member has irregularities and a gap is generated between the joining member and the filler material, welding failure may occur due to carbonization of the filler material due to laser light irradiation. In order to fill in this gap, a huge pressing device is required in order to clamp the joining members together with a strong load, which has been an obstacle to securing the scanning space of the laser head during welding.
Japanese Patent Laid-Open No. 4-157082 (FIG. 1)

本発明は上記のような事情に基づいて完成されたものであって、接合部材を強固に接合できるレーザー溶接方法およびレーザー溶接構造を提供することを目的とする。   This invention is completed based on the above situations, Comprising: It aims at providing the laser welding method and laser welding structure which can join a joining member firmly.

上記の目的を達成するための手段として、請求項１の発明は、合成樹脂材料によって形成された一対の接合部材の間に、レーザー光吸収率の高い熱可塑性の合成樹脂材料により形成された連結層を介装し、レーザー光を前記連結層に照射することにより溶融させ、前記接合部材を互いに接合するレーザー溶接方法において、前記連結層を撓み可能に形成し、この連結層を前記接合部材の間で挟圧することにより、それらの接合面の面形状に追従させた上で、前記連結層にレーザー光を照射して、それらを互いに接合することを特徴とするレーザー溶接方法とした。   As a means for achieving the above-mentioned object, the invention of claim 1 is characterized in that a connection formed by a thermoplastic synthetic resin material having a high laser light absorption rate between a pair of joining members formed by a synthetic resin material. In a laser welding method in which a layer is interposed and melted by irradiating the coupling layer with laser light, and the joining members are joined to each other, the joining layer is formed to be deflectable, and the joining layer is formed on the joining member. The laser welding method is characterized in that the joining layer is irradiated with a laser beam after being joined to each other by applying pressure between them so as to follow the surface shape of the joining surfaces.

請求項２の発明は、前記連結層は熱可塑性の合成樹脂材料による不織布にて形成されたことを特徴とする請求項１記載のレーザー溶接方法とした。   According to a second aspect of the present invention, there is provided the laser welding method according to the first aspect, wherein the connection layer is formed of a nonwoven fabric made of a thermoplastic synthetic resin material.

請求項３の発明は、前記接合部材は熱可塑性の合成樹脂材料にて形成され、前記連結層にレーザー光を照射して溶融させることにより、その熱の伝播のために前記接合部材の接合面も溶融し、前記接合部材が互いに接合されることを特徴とする請求項１または請求項２記載のレーザー溶接方法とした。   According to a third aspect of the present invention, the joining member is formed of a thermoplastic synthetic resin material, and the joining layer is joined to the joining layer for propagation of heat by irradiating the joining layer with a laser beam to melt the joining layer. 3. The laser welding method according to claim 1, wherein the joining members are joined to each other.

請求項４の発明は、前記連結層の目付は１０〜１００ｇ／ｍ２、厚みは０．２〜２ｍｍであることを特徴とする請求項２記載のレーザー溶接方法とした。 The invention according to claim 4 is the laser welding method according to claim 2, wherein the weight of the coupling layer is 10 to 100 g / m 2 and the thickness is 0.2 to 2 mm.

請求項５の発明は、前記接合部材は非石油系の合成樹脂材料からなることを特徴とする請求項１乃至請求項４のいずれかに記載のレーザー溶接方法とした。   The invention according to claim 5 is the laser welding method according to any one of claims 1 to 4, wherein the joining member is made of a non-petroleum synthetic resin material.

請求項６の発明は、前記一対の接合部材および連結層は、同一の樹脂材料にて形成されたことを特徴とする請求項１乃至請求項５のいずれかに記載のレーザー溶接方法とした。   A sixth aspect of the present invention is the laser welding method according to any one of the first to fifth aspects, wherein the pair of joining members and the coupling layer are formed of the same resin material.

請求項７の発明は、前記一対の接合部材および連結層は、ポリ乳酸樹脂にて形成されたことを特徴とする請求項６記載のレーザー溶接方法とした。   The invention according to claim 7 is the laser welding method according to claim 6, wherein the pair of joining members and the connection layer are formed of polylactic acid resin.

請求項８の発明は、合成樹脂材料によって形成された一対の接合部材、およびレーザー光吸収率の高い熱可塑性の合成樹脂材料により形成されるとともに、前記接合部材の間に介装され、レーザー光を照射することにより溶融されて、前記接合部材を互いに接合する連結層を備えたレーザー溶接構造において、前記連結層は撓み可能に形成され、この連結層が前記接合部材の間で挟圧されることにより、それらの接合面の面形状に追従した上でレーザー光を照射し、それらが互いに接合されることを特徴とするレーザー溶接構造とした。   The invention according to claim 8 is formed of a pair of joining members formed of a synthetic resin material and a thermoplastic synthetic resin material having a high laser light absorption rate, and is interposed between the joining members, and laser light. In the laser welding structure provided with a connection layer that is melted by irradiating and joining the joining members to each other, the joining layer is formed to be deflectable, and the joining layer is sandwiched between the joining members. Thus, a laser welding structure characterized in that the laser beam was irradiated after following the surface shape of the joint surfaces to join them together.

＜請求項１の発明＞
連結層を撓み可能に形成し、この連結層を接合部材の間で挟圧することにより、それらの接合面の面形状に追従させた上で、連結層にレーザー光を照射して、それらを互いに接合する構成としたことにより、接合部材間に隙間が発生せず、これらが強固に接合される。 <Invention of Claim 1>
The connecting layer is formed so as to be deflectable, and the connecting layer is sandwiched between the joining members so as to follow the surface shape of the joining surface. By adopting a configuration for joining, there is no gap between the joining members, and these are joined firmly.

＜請求項２の発明＞
連結層は熱可塑性の合成樹脂材料による不織布にて形成された構成としたことにより、接合面の面形状への追従性がよく、接合部材を挟圧することで不織布が接合部材間の隙間を容易に埋めることができる。 <Invention of Claim 2>
The connection layer is made of a nonwoven fabric made of a thermoplastic synthetic resin material, so that the followability to the surface shape of the joining surface is good, and the nonwoven fabric can easily form a gap between the joining members by clamping the joining member. Can be buried.

＜請求項３の発明＞
接合部材は熱可塑性の合成樹脂材料にて形成され、連結層にレーザー光を照射して溶融させることにより、その熱の伝播のために接合部材の接合面も溶融して混ざり合い、接合部材が互いに接合される構成としたことにより、これらの接合力をより増大させることができる。 <Invention of Claim 3>
The joining member is formed of a thermoplastic synthetic resin material. By irradiating the coupling layer with laser light and melting it, the joining surface of the joining member is also melted and mixed for propagation of the heat. By adopting a configuration in which they are joined together, these joining forces can be further increased.

＜請求項４の発明＞
連結層の目付は１０〜１００ｇ／ｍ２、厚みは０．２〜２ｍｍとしたことにより、接合部材間の、溶接不良を発生させるような隙間を容易に埋めることができる。 <Invention of Claim 4>
By setting the basis weight of the connection layer to 10 to 100 g / m 2 and the thickness to 0.2 to 2 mm, it is possible to easily fill a gap between the joining members that causes poor welding.

＜請求項５の発明＞
接合部材は非石油系の合成樹脂材料からなる構成としたことにより、接合部材のリサイクルが行いやすく、また、環境にもよい。 <Invention of Claim 5>
Since the joining member is made of a non-petroleum synthetic resin material, the joining member can be easily recycled and is good for the environment.

＜請求項６の発明＞
一対の接合部材および連結層は、同一の樹脂材料にて形成された構成としたことにより、これらの間の相性がよく、レーザー光の照射により、接合部材および連結層が溶融して互いに混じり合い、これらの接合力を、いっそう増大させることができる。 <Invention of Claim 6>
Since the pair of joining members and the connecting layer are formed of the same resin material, the compatibility between them is good, and the joining member and the connecting layer are melted and mixed with each other by irradiation with laser light. These bonding forces can be further increased.

＜請求項７の発明＞
一対の接合部材および連結層は、ポリ乳酸樹脂にて形成された構成としたことにより、環境によいレーザー溶接方法とすることができる。 <Invention of Claim 7>
Since the pair of joining members and the connection layer are made of polylactic acid resin, a laser welding method that is good for the environment can be achieved.

＜請求項８の発明＞
連結層は撓み可能に形成され、この連結層が接合部材の間で挟圧されることにより、それらの接合面の面形状に追従した上でレーザー光を照射し、それらが互いに接合される構成としたことにより、接合部材間に隙間が発生せず、これらが強固に接合される溶接構造とすることができる。 <Invention of Claim 8>
The connection layer is formed so as to be able to bend, and the connection layer is sandwiched between the bonding members, so that the laser beam is irradiated after following the surface shape of the bonding surface, and they are bonded to each other. By doing so, a gap is not generated between the joining members, and a welded structure in which these are firmly joined can be obtained.

本発明の実施形態を図１乃至図５によって説明する。本実施形態によるレーザー溶接構造１は、図１に示すように、車輌用のトリムボード２上にブラケット３が溶接されたものである。トリムボード２は、図示しない車輌ドアの車室内側に取り付けられる化粧板であって、熱可塑性の合成樹脂材料にて形成された平板状の基体２１上を、天然皮革、合成皮革または繊維によって形成された表皮２２によって覆ったものである。   An embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the laser welding structure 1 according to the present embodiment is obtained by welding a bracket 3 on a trim board 2 for a vehicle. The trim board 2 is a decorative board that is attached to the interior of a vehicle door (not shown). The trim board 2 is formed of natural leather, synthetic leather, or fiber on a flat substrate 21 formed of a thermoplastic synthetic resin material. It is covered with the covered skin 22.

ブラケット３は、やはり熱可塑性の合成樹脂材料にて一体に形成され、トリムボード２の車輌外側に取り付けられており、円板状の溶接部３１上にラグビーボール状の取付部３２が立設されたものである。取付部３２は、互いに等角度間隔に配置されるとともに、それぞれの両端部において結合された３本の可撓片３２ａにて形成されており、可撓片３２ａは、それぞれ中央部が取付部３２の半径方向内方へ撓み可能とされている。トリムボード２とブラケット３は、本発明の一対の接合部材に該当している。   The bracket 3 is also integrally formed of a thermoplastic synthetic resin material and is attached to the outer side of the trim board 2, and a rugby ball-like attachment portion 32 is erected on a disc-like weld portion 31. It is a thing. The attachment portions 32 are arranged at equiangular intervals from each other, and are formed by three flexible pieces 32a joined at both ends, and the flexible pieces 32a have attachment portions 32 at the center portions. It is possible to bend inward in the radial direction. The trim board 2 and the bracket 3 correspond to a pair of joining members of the present invention.

トリムボード２を車輌ドアの図示しないインナパネルに取り付ける場合、それぞれの可撓片３２ａを撓ませて、ブラケット３の取付部３２をインナパネルの取付孔に挿通させ、インナパネルが取付部３２の根元部まで到達した時、可撓片３２ａが形状復帰することにより、取付部３２はインナパネルからの抜け止めとしての機能を果たす。ブラケット３の溶接部３１は、本発明のレーザー溶接方法により、熱可塑性の合成樹脂材料にて形成された連結層４を介してトリムボード２に固着されている。尚、本実施形態においては、後述するように、連結層４とトリムボード２の基体２１との間には接着剤５が介装されている。   When the trim board 2 is attached to an inner panel (not shown) of the vehicle door, the respective flexible pieces 32a are bent so that the attachment portion 32 of the bracket 3 is inserted into the attachment hole of the inner panel. When the flexible piece 32a returns to its shape when it reaches the part, the mounting part 32 functions as a retaining member from the inner panel. The welded portion 31 of the bracket 3 is fixed to the trim board 2 via the connecting layer 4 formed of a thermoplastic synthetic resin material by the laser welding method of the present invention. In this embodiment, as will be described later, an adhesive 5 is interposed between the coupling layer 4 and the base 21 of the trim board 2.

図２に示すように、レーザー溶接構造１を形成する時、最初にトリムボード２を基体２１が上方を向くように、固定台６（図３示）上に載置する。基体２１は、熱可塑性樹脂であるポリプロピレン樹脂（ＰＰ）を基材とし、靭皮植物であるケナフを１〜９９％含有した繊維強化材で、ケナフを５０％、ポリプロピレン樹脂を５０％含んだ繊維強化ボードとすることが好ましい。あるいは、非石油系の熱可塑性樹脂であるポリ乳酸樹脂（ＰＬＡ）を基材とし、ケナフを１〜９９％含有した繊維強化材で、好ましくはケナフを５０％、ポリ乳酸樹脂を５０％含んだ繊維強化ボードとしてもよい。本実施形態においては、基体２１の目付（密度）は１．０〜２．０ｋｇ／ｍ２、板厚は１．０〜４．５ｍｍにすることが望ましい。基体２１には、熱可塑性樹脂材料であれば、ポリプロピレン樹脂およびポリ乳酸樹脂以外の材料を使用してもかまわない。 As shown in FIG. 2, when the laser welding structure 1 is formed, the trim board 2 is first placed on the fixed base 6 (shown in FIG. 3) so that the base 21 faces upward. The base 21 is a fiber reinforcing material containing 1 to 99% of kenaf which is a bast plant, based on a polypropylene resin (PP) which is a thermoplastic resin, and a fiber containing 50% of kenaf and 50% of polypropylene resin. A reinforced board is preferable. Alternatively, a fiber reinforced material containing 1 to 99% of kenaf based on polylactic acid resin (PLA), which is a non-petroleum thermoplastic resin, preferably 50% of kenaf and 50% of polylactic acid resin. It is good also as a fiber reinforced board. In the present embodiment, it is desirable that the basis weight (density) of the base 21 is 1.0 to 2.0 kg / m 2 and the plate thickness is 1.0 to 4.5 mm. As long as the substrate 21 is a thermoplastic resin material, a material other than polypropylene resin and polylactic acid resin may be used.

次に、基体２１上に、連結層４を載置して固定する。連結層４はポリプロピレン樹脂による不織布にて、撓み可能に形成されているが、熱可塑性の合成樹脂材料による発泡体等にて撓み可能に形成されていてもよい。あるいは、ポリ乳酸樹脂による不織布にて形成されてもよい。不織布にて形成された連結層４は、目付が１０〜１００ｇ／ｍ２、厚みが０．２〜２ｍｍとなるように形成されており、スパンボンド法、メルトブロー法、エアレイ法あるいはカードレイヤー法といった公知の製法のいずれによって製造されてもよい。 Next, the coupling layer 4 is placed and fixed on the base 21. Although the connection layer 4 is formed of a nonwoven fabric made of polypropylene resin so as to be able to bend, it may be formed so as to be able to be bent using a foam or the like made of a thermoplastic synthetic resin material. Or you may form with the nonwoven fabric by a polylactic acid resin. The connection layer 4 formed of a nonwoven fabric is formed so as to have a basis weight of 10 to 100 g / m 2 and a thickness of 0.2 to 2 mm, such as a spunbond method, a melt blow method, an air array method, or a card layer method. It may be produced by any known production method.

連結層４は基体２１とブラケット３との間の、溶接する部位のみに介装されていればよいため、中央部に貫通孔４１を備えたドーナツ状に形成され、カーボンブラックを０．１〜１ｗｔ％添加することにより、黒色あるいはその他の暗色を呈しており、レーザー光の吸収率が高くなるように形成されている。連結層４の下面には、エポキシ系の接着剤５が塗布されており、基体２１上に載置された場合に、その位置ずれが発生しないようにされている。尚、図４および図５においては、接着剤５の図示は省略されている。   Since the connection layer 4 only needs to be interposed between the base 21 and the bracket 3 to be welded, the connection layer 4 is formed in a donut shape having a through hole 41 at the center, and carbon black is 0.1 to By adding 1 wt%, black or other dark color is exhibited, and the absorption rate of laser light is increased. An epoxy-based adhesive 5 is applied to the lower surface of the coupling layer 4 so that when it is placed on the base body 21, the positional deviation does not occur. 4 and 5, the illustration of the adhesive 5 is omitted.

基体２１上に連結層４を固定した後、連結層４上にブラケット３を設置する。ブラケット３は、ポリプロピレン樹脂あるいはポリ乳酸樹脂を材料として、射出成形によって白色あるいはその他の淡色に形成されている。ブラケット３には、熱可塑性樹脂材料であれば、ポリプロピレン樹脂およびポリ乳酸樹脂以外の材料を使用してもかまわない。   After fixing the connection layer 4 on the base body 21, the bracket 3 is installed on the connection layer 4. The bracket 3 is made of white or other light color by injection molding using polypropylene resin or polylactic acid resin as a material. A material other than polypropylene resin and polylactic acid resin may be used for the bracket 3 as long as it is a thermoplastic resin material.

固定台６上に、トリムボード２、連結層４、ブラケット３の順に載置された後、図３に示すように、ブラケット３の溶接部３１の上面を、押圧装置７によって鉛直下方に押さえ、固定台６との間で、基体２１、連結層４およびブラケット３を挟圧（クランプ）する。これにより、撓み可能な連結層４は、基体２１と溶接部３１との間で挟圧され、基体２１および溶接部３１の接合面の面形状に追従する。   After the trim board 2, the connection layer 4, and the bracket 3 are placed in this order on the fixed base 6, as shown in FIG. 3, the upper surface of the welded portion 31 of the bracket 3 is pressed vertically downward by the pressing device 7. The base body 21, the coupling layer 4, and the bracket 3 are clamped (clamped) with the fixed base 6. Thereby, the bendable connection layer 4 is sandwiched between the base 21 and the welded portion 31 and follows the surface shape of the joint surface between the base 21 and the welded portion 31.

従って、例えば、図４（Ａ）に示したように、基体２１（ブラケット３の溶接部３１でもよい）上に空気層を形成する凹部２１ａが存在しても、図４（Ｂ）に示したように、基体２１と溶接部３１とによって挟圧された連結層４が、凹部２１ａを埋めることが可能となる。基体２１および溶接部３１の接合面において、それらの間に発生する隙間が、０．１５ｍｍ以下であれば、良好な溶接を行うことができるため、本実施形態においては、接合面の隙間を０．１５ｍｍ以下にするために、上述したように、不織布により形成された連結層４の、目付が１０〜１００ｇ／ｍ２、厚みが０．２〜２ｍｍに設定されている。 Therefore, for example, as shown in FIG. 4A, even if there is a recess 21a that forms an air layer on the base 21 (or the welded portion 31 of the bracket 3), it is shown in FIG. As described above, the connection layer 4 sandwiched between the base body 21 and the welded portion 31 can fill the concave portion 21a. If the gap generated between the base 21 and the welded portion 31 is 0.15 mm or less, good welding can be performed. In this embodiment, the gap between the joints is set to 0. In order to make it 15 mm or less, as described above, the weight of the connection layer 4 formed of the nonwoven fabric is set to 10 to 100 g / m 2 and the thickness is set to 0.2 to 2 mm.

この状態で、汎用６軸ロボット８の可動アーム８１の先端に取り付けられた半導体レーザー（ＹＡＧレーザーでもよい）によるレーザーヘッド８２から溶接部３１の上面に、例えば、レーザー出力：１００Ｗ、レーザーヘッド走査速度：２０ｍｍ／分、レーザースポット径：４ｍｍ、レーザー照射長さ：４０ｍｍ、押圧装置７のクランプ力：１５０ｇ／ｃｍ２の条件にてレーザー光が照射される。ブラケット３は、その外観色のためにレーザー光の吸収率が低く、溶接部３１を透過したレーザー光が連結層４にエネルギー吸収されて、連結層４を１７０〜２３０℃で加熱して溶融させる。 In this state, for example, laser output: 100 W, laser head scanning speed from the laser head 82 to the upper surface of the weld 31 by a semiconductor laser (or YAG laser) attached to the tip of the movable arm 81 of the general-purpose 6-axis robot 8. The laser beam is irradiated under the conditions of: 20 mm / min, laser spot diameter: 4 mm, laser irradiation length: 40 mm, and clamping force of the pressing device 7: 150 g / cm 2 . The bracket 3 has a low laser light absorptivity due to its appearance color, and the laser light transmitted through the welded portion 31 is absorbed by the coupling layer 4, and the coupling layer 4 is heated and melted at 170 to 230 ° C. .

連結層４に発生した熱は、隣接した基体２１と溶接部３１の接合面に伝播してこれらをも溶融させる（図４（Ｃ）示）。溶融された、基体２１、連結層４および溶接部３１の接合面は、互いに混じり合った後、レーザー光の照射を停止することにより冷却され、互いに接合される（図５示）。尚、レーザー光によるレーザービードは、レーザーヘッド８２がブラケット３上を移動することにより、溶接部３１上に周状に形成されてもよいし、複数のスポット状に形成されてもよい。   The heat generated in the connection layer 4 propagates to the joint surface between the adjacent base 21 and the welded portion 31 and melts them (shown in FIG. 4C). The melted joint surfaces of the base body 21, the coupling layer 4, and the welded portion 31 are mixed with each other and then cooled by stopping the laser light irradiation and joined to each other (shown in FIG. 5). The laser beads by the laser beam may be formed on the welded portion 31 in a circumferential shape by moving the laser head 82 on the bracket 3 or may be formed in a plurality of spot shapes.

表１に示すように、基体２１、ブラケット３および連結層４を形成する材料により、４種類の組み合わせが考えられるが、いずれのものでも、本発明のレーザー溶接方法が適用可能である。この内、ポリ乳酸樹脂（ケナフ含有）による基体２１、ポリ乳酸樹脂によるブラケット３およびポリ乳酸樹脂の不織布による連結層４を組み合わせた組み合わせ１、およびポリプロピレン樹脂（ケナフ含有）による基体２１、ポリプロピレン樹脂によるブラケット３およびポリプロピレン樹脂の不織布による連結層４を組み合わせた組み合わせ４は、接合面において、溶融した同種の樹脂材料が互いに混ざり合うため、その接合力を増大させることが可能となる。

Figure 2005279990
As shown in Table 1, four types of combinations are conceivable depending on the material for forming the base body 21, the bracket 3 and the coupling layer 4, but the laser welding method of the present invention can be applied to any of them. Among these, the base 21 made of polylactic acid resin (containing kenaf), the combination 1 combining the bracket 3 made of polylactic acid resin and the connecting layer 4 made of non-woven fabric of polylactic acid resin, and the base 21 made of polypropylene resin (containing kenaf), made of polypropylene resin In the combination 4 in which the bracket 3 and the coupling layer 4 made of a nonwoven fabric of polypropylene resin are combined, the same kind of molten resin materials are mixed with each other on the bonding surface, so that the bonding force can be increased.
Figure 2005279990

本実施形態においては、連結層４を撓み可能に形成し、この連結層４を基体２１とブラケット３の間で挟圧することにより、それらの接合面の面形状に追従させた上で、連結層４にレーザー光を照射して、それらを互いに接合する構成としたことにより、基体２１とブラケット３との間に隙間が発生せず、これらを強固に接合できる。また、これにより、基体２１とブラケット３とをクランプする荷重を低減できるため、押圧装置７を小型化することができ、溶接時のレーザーヘッド８２の移動の妨げとなることを防ぐことができる。また、連結層４は熱可塑性の合成樹脂材料による不織布にて形成された構成としたことにより、基体２１およびブラケット３の接合面への追従性がよく、これらを挟圧することで、連結層４が基体２１とブラケット３との間の隙間を容易に埋めることができ、溶接を良好に行うことが可能となる。   In the present embodiment, the connecting layer 4 is formed so as to be deflectable, and the connecting layer 4 is sandwiched between the base 21 and the bracket 3 so as to follow the surface shape of their joint surfaces, and then the connecting layer 4 By irradiating 4 with laser light and joining them together, there is no gap between the base 21 and the bracket 3, and these can be joined firmly. Moreover, since the load which clamps the base | substrate 21 and the bracket 3 can be reduced by this, the press apparatus 7 can be reduced in size and it can prevent that the movement of the laser head 82 at the time of welding is prevented. In addition, since the connection layer 4 is formed of a nonwoven fabric made of a thermoplastic synthetic resin material, the followability to the joining surface of the base body 21 and the bracket 3 is good. However, the gap between the base 21 and the bracket 3 can be easily filled, and welding can be performed satisfactorily.

また、基体２１とブラケット３とを熱可塑性の合成樹脂材料にて形成し、連結層４にレーザー光を照射して溶融させることにより、その熱の伝播のために基体２１とブラケット３の接合面も溶融し、これらが互いに接合される構成としたことにより、これらの接合力をより増大させることができる。また、連結層４の目付を１０〜１００ｇ／ｍ２、厚みを０．２〜２ｍｍとしたことにより、基体２１とブラケット３との間において、溶接不良を発生させるような隙間を容易に埋めることができる。 Further, the base 21 and the bracket 3 are formed of a thermoplastic synthetic resin material, and the joining layer 4 is irradiated with a laser beam and melted. Also, the joining force can be increased by adopting a structure in which these are melted and joined together. Further, by setting the basis weight of the coupling layer 4 to 10 to 100 g / m 2 and the thickness to 0.2 to 2 mm, a gap that causes poor welding between the base 21 and the bracket 3 can be easily filled. Can do.

また、基体２１、ブラケット３、および連結層４を、同一の材料にて形成すれば、これらの間の相性がよく、レーザー光の照射により、これらが溶融して互いに混じり合い、これらの間の接合力を、いっそう増大させることができる。更に、基体２１、ブラケット３、および連結層４を非石油系のポリ乳酸樹脂によって形成すれば、これらのリサイクルが行いやすく、また、環境にもよい。   Moreover, if the base | substrate 21, the bracket 3, and the connection layer 4 are formed with the same material, they will have good compatibility, and they will melt and mix with each other when irradiated with laser light. The bonding force can be further increased. Furthermore, if the base 21, the bracket 3, and the coupling layer 4 are formed of a non-petroleum polylactic acid resin, they can be easily recycled and are good for the environment.

＜他の実施形態＞
本発明は上述の記載および図面によって説明した実施形態に限定されるものではなく、例えば次のような実施形態も本発明の技術的範囲に含まれ、さらに、以下の記載のもの以外にも要旨を逸脱しない範囲内で種々変更して実施することができる。
（１）連結層４は、ポリエチレンテレフタレート樹脂（ＰＥＴ）または塩化ビニル樹脂による不織布にて形成してもよい。
（２）リサイクルが可能で、環境によい非石油系の熱可塑性樹脂として、基体２１、ブラケット３、あるいは連結層４に、ポリブチレンサクシネート、またはポリエチレンサクシネートを使用してもよい。
（３）連結層４を基体２１上に載置する場合、位置ずれ防止のための治具等を用いることにより、接着剤を使用しないようにすれば、レーザー光の照射による接合面の溶融部位が、純粋な熱可塑性の樹脂材料のみとなるため、よりいっそう強固に接合できる。
（４）連結層４を、基体２１を覆うような一続きのものにすれば、基体２１に複数のブラケット３を溶接する場合にも、連結層４の基体２１上への配置が容易となる。
（５）基体２１は、必ずしも板状のものでなくともよく、あらゆる形状のものが使用可能である。また、ブラケット３についても、あらゆる形状のものに、本発明によるレーザー溶接方法が適用可能である。 <Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention. Various modifications can be made without departing from the scope of the invention.
(1) The coupling layer 4 may be formed of a nonwoven fabric made of polyethylene terephthalate resin (PET) or vinyl chloride resin.
(2) Polybutylene succinate or polyethylene succinate may be used for the substrate 21, the bracket 3 or the connecting layer 4 as a non-petroleum thermoplastic resin that can be recycled and is environmentally friendly.
(3) When the coupling layer 4 is placed on the substrate 21, if the adhesive is not used by using a jig or the like for preventing misalignment, the melted portion of the joint surface due to laser light irradiation. However, since it is only a pure thermoplastic resin material, it can join still more firmly.
(4) If the connection layer 4 is a continuous one that covers the base body 21, the connection layer 4 can be easily arranged on the base body 21 even when a plurality of brackets 3 are welded to the base body 21. .
(5) The substrate 21 is not necessarily plate-shaped, and any shape can be used. Also, the laser welding method according to the present invention is applicable to the bracket 3 having any shape.

本実施形態によるレーザー溶接構造の外観を示す斜視図である。It is a perspective view which shows the external appearance of the laser welding structure by this embodiment. 本実施形態によるレーザー溶接方法において、各構成の積層方法を示す斜視図である。In the laser welding method by this embodiment, it is a perspective view which shows the lamination | stacking method of each structure. レーザー光の照射状態を示す斜視図である。It is a perspective view which shows the irradiation state of a laser beam. レーザー溶接構造の、各構成の積層時の接合面を示した拡大図（Ａ）、接合面を挟圧した状態を示す拡大図（Ｂ）、接合面にレーザー光を照射した状態を示す拡大図（Ｃ）である。The enlarged view (A) which showed the joining surface at the time of lamination | stacking of each structure of a laser welding structure, the enlarged view (B) which shows the state which pinched the joining surface, and the enlarged view which shows the state which irradiated the laser beam to the joining surface (C). 接合面の溶接された状態を示す拡大図である。It is an enlarged view which shows the state by which the joint surface was welded.

符号の説明Explanation of symbols

１…レーザ溶接構造
２…トリムボード
３…ブラケット
４…連結層
２１…基体
３１…溶接部
８２…レーザーヘッド DESCRIPTION OF SYMBOLS 1 ... Laser welding structure 2 ... Trim board 3 ... Bracket 4 ... Connection layer 21 ... Base | substrate 31 ... Welding part 82 ... Laser head

Claims (8)

合成樹脂材料によって形成された一対の接合部材の間に、レーザー光吸収率の高い熱可塑性の合成樹脂材料により形成された連結層を介装し、レーザー光を前記連結層に照射することにより溶融させ、前記接合部材を互いに接合するレーザー溶接方法において、
前記連結層を撓み可能に形成し、この連結層を前記接合部材の間で挟圧することにより、それらの接合面の面形状に追従させた上で、前記連結層にレーザー光を照射して、それらを互いに接合することを特徴とするレーザー溶接方法。 Between a pair of joining members formed of a synthetic resin material, a connecting layer formed of a thermoplastic synthetic resin material having a high laser light absorption rate is interposed, and melted by irradiating the connecting layer with laser light. In the laser welding method for joining the joining members to each other,
The connecting layer is formed so that it can be bent, and the connecting layer is sandwiched between the joining members so as to follow the surface shape of those joining surfaces, and then the connecting layer is irradiated with laser light, A laser welding method characterized by joining them together. 前記連結層は熱可塑性の合成樹脂材料による不織布にて形成されたことを特徴とする請求項１記載のレーザー溶接方法。 The laser welding method according to claim 1, wherein the connection layer is formed of a nonwoven fabric made of a thermoplastic synthetic resin material. 前記接合部材は熱可塑性の合成樹脂材料にて形成され、前記連結層にレーザー光を照射して溶融させることにより、その熱の伝播のために前記接合部材の接合面も溶融し、前記接合部材が互いに接合されることを特徴とする請求項１または請求項２記載のレーザー溶接方法。 The joining member is formed of a thermoplastic synthetic resin material, and the joining layer is melted by irradiating the connecting layer with laser light so that the joining surface of the joining member is melted for propagation of the heat. The laser welding method according to claim 1, wherein the two are joined together. 前記連結層の目付は１０〜１００ｇ／ｍ２、厚みは０．２〜２ｍｍであることを特徴とする請求項２記載のレーザー溶接方法。 The laser welding method according to claim 2 , wherein the weight of the connection layer is 10 to 100 g / m 2 and the thickness is 0.2 to 2 mm. 前記接合部材は非石油系の合成樹脂材料からなることを特徴とする請求項１乃至請求項４のいずれかに記載のレーザー溶接方法。 The laser welding method according to claim 1, wherein the joining member is made of a non-petroleum synthetic resin material. 前記一対の接合部材および連結層は、同一の樹脂材料にて形成されたことを特徴とする請求項１乃至請求項５のいずれかに記載のレーザー溶接方法。 The laser welding method according to any one of claims 1 to 5, wherein the pair of joining members and the coupling layer are formed of the same resin material. 前記一対の接合部材および連結層は、ポリ乳酸樹脂にて形成されたことを特徴とする請求項６記載のレーザー溶接方法。 The laser welding method according to claim 6, wherein the pair of joining members and the connection layer are made of polylactic acid resin. 合成樹脂材料によって形成された一対の接合部材、および
レーザー光吸収率の高い熱可塑性の合成樹脂材料により形成されるとともに、前記接合部材の間に介装され、レーザー光を照射することにより溶融されて、前記接合部材を互いに接合する連結層を備えたレーザー溶接構造において、
前記連結層は撓み可能に形成され、この連結層が前記接合部材の間で挟圧されることにより、それらの接合面の面形状に追従した上でレーザー光を照射し、それらが互いに接合されることを特徴とするレーザー溶接構造。 A pair of joining members formed of a synthetic resin material and a thermoplastic synthetic resin material having a high laser light absorption rate, and are interposed between the joining members and melted by irradiation with laser light. In the laser welding structure provided with a connecting layer that joins the joining members together,
The connecting layer is formed so as to be able to bend, and when the connecting layer is sandwiched between the joining members, laser light is irradiated after following the surface shape of the joining surfaces, and they are joined together. Laser welding structure characterized by that.
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