JP2007182003A - Laser welding method for resin material - Google Patents

Laser welding method for resin material Download PDF

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JP2007182003A
JP2007182003A JP2006002086A JP2006002086A JP2007182003A JP 2007182003 A JP2007182003 A JP 2007182003A JP 2006002086 A JP2006002086 A JP 2006002086A JP 2006002086 A JP2006002086 A JP 2006002086A JP 2007182003 A JP2007182003 A JP 2007182003A
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resin material
laser beam
welding
preheating
laser
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Kazuaki Hokota
和晃 鉾田
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Stanley Electric Co Ltd
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Stanley Electric Co Ltd
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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
    • 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
    • B29C66/02—Preparation of the material, in the area to be joined, prior to joining or welding
    • B29C66/024—Thermal pre-treatments
    • B29C66/0242—Heating, or preheating, e.g. drying
    • 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
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1664—Laser beams characterised by the way of heating the interface making use of several radiators
    • 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
    • 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
    • B29C66/01—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
    • 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
    • B29C66/01—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
    • B29C66/114—Single butt joints
    • B29C66/1142—Single butt to butt joints
    • 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
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • 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
    • 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
    • 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
    • B29C65/1687—Laser beams making use of light guides
    • 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
    • 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
    • B29C66/836—Moving relative to and tangentially to the parts to be joined, e.g. transversely to the displacement of the parts to be joined, e.g. using a X-Y table
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0072—Roughness, e.g. anti-slip

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Optics & Photonics (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • Toxicology (AREA)
  • Thermal Sciences (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a fear that the width of a really welded part becomes narrower than the width of the part to be welded and also a fear that a molten and expanded resin material juts out from the locus of the scanned welding laser beam. <P>SOLUTION: A layer welding method comprises bringing, with pressurization, the first resin material 1 of a higher laser beam transmission and the second resin material 2 of a lower laser beam transmission into contact and irradiating the contact boundary surfaces of the first resin material 1 and second resin material 2 with a welding laser beam 4 from the side of the first resin material 1 to weld the first resin material 1 and the second resin material 2 together. Before a process of irradiating the contact boundary surfaces of the first resin material 1 and the second resin material 2 with the welding layer beam 4, a process of irradiating the contact boundary surfaces of the first resin material 1 and the second resin material 2 with a laser beam 3 for preliminary heating is arranged to cause the diameter of the spot of the laser beam 3 for preliminary heat to be larger than that of the welding laser beam 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、レーザー光の透過率の大きい樹脂材と、レーザー光の透過率の小さい樹脂材との当接界面に溶着用レーザー光を照射することにより、それらの樹脂材を溶着するようにした樹脂材のレーザー溶着方法に関し、特には、実際に溶着された部分の幅が溶着されるべき部分の幅よりも狭くなってしまうおそれを低減しつつ、スキャンせしめられた溶着用レーザー光の軌跡から溶融・膨張せしめられた樹脂材がはみ出してしまうおそれを低減することができる樹脂材のレーザー溶着方法に関する。   In the present invention, the resin material is welded by irradiating the welding laser beam to the contact interface between the resin material having a high laser light transmittance and the resin material having a low laser light transmittance. Regarding the laser welding method of resin material, in particular, from the trajectory of the welding laser beam scanned while reducing the possibility that the width of the actually welded portion will be narrower than the width of the portion to be welded The present invention relates to a laser welding method of a resin material that can reduce the risk of the molten and expanded resin material protruding.

従来から、レーザー光の透過率の大きい樹脂材と、レーザー光の透過率の小さい樹脂材との当接界面に溶着用レーザー光を照射することにより、それらの樹脂材を溶着するようにした樹脂材のレーザー溶着方法が知られている。この種の樹脂材のレーザー溶着方法の例としては、例えば特開２００４−７４７３４号公報、特開２００４−１８８８０２号公報などに記載されたものがある。   Conventionally, these resin materials are welded by irradiating a welding laser beam to the contact interface between a resin material having a high laser light transmittance and a resin material having a low laser light transmittance. Laser welding methods for materials are known. Examples of this type of resin material laser welding method include those described in, for example, Japanese Patent Application Laid-Open Nos. 2004-74734 and 2004-188802.

特開２００４−７４７３４号公報に記載された樹脂材のレーザー溶着方法では、レーザー光の透過率の大きい樹脂材である透過性樹脂材と、レーザー光の透過率の小さい樹脂材である吸収性樹脂材とを加圧して接触させ、透過性樹脂材と吸収性樹脂材との当接界面に溶着用レーザー光を透過性樹脂材側から照射することにより、透過性樹脂材と吸収性樹脂材とが溶着されている。   In the laser welding method of a resin material described in Japanese Patent Application Laid-Open No. 2004-74734, a transparent resin material that is a resin material having a high laser light transmittance and an absorbent resin that is a resin material having a low laser light transmittance By irradiating a welding laser beam from the transparent resin material side to the contact interface between the transparent resin material and the absorbent resin material, pressurizing and contacting the material, the transparent resin material and the absorbent resin material Is welded.

更に、特開２００４−７４７３４号公報に記載された樹脂材のレーザー溶着方法では、溶着用レーザー光によって透過性樹脂材と吸収性樹脂材とが溶着される前に、吸収性樹脂材に当接する透過性樹脂材の表面、および、透過性樹脂材に当接する吸収性樹脂材の表面が、予め加熱され、軟化せしめられている。それにより、特開２００４−７４７３４号公報に記載された樹脂材のレーザー溶着方法では、透過性樹脂材の表面と吸収性樹脂材の表面との密着性が悪い場合、つまり、透過性樹脂材の表面および吸収性樹脂材の表面に凹凸が存在する場合であっても、透過性樹脂材と吸収性樹脂材との溶着強度が向上せしめられている。   Furthermore, in the laser welding method of a resin material described in Japanese Patent Application Laid-Open No. 2004-74734, the resin material comes into contact with the absorbent resin material before the transparent resin material and the absorbent resin material are welded by welding laser light. The surface of the permeable resin material and the surface of the absorbent resin material in contact with the permeable resin material are preheated and softened. Thereby, in the laser welding method of the resin material described in JP 2004-74734 A, when the adhesion between the surface of the permeable resin material and the surface of the absorbent resin material is poor, that is, Even when unevenness exists on the surface and the surface of the absorbent resin material, the welding strength between the permeable resin material and the absorbent resin material is improved.

具体的には、特開２００４−７４７３４号公報には、吸収性樹脂材に当接する透過性樹脂材の表面、および、透過性樹脂材に当接する吸収性樹脂材の表面を予備加熱するための方式として、電磁誘導加熱方式、ヒーター加熱方式、熱風加熱方式、赤外線ランプ加熱方式およびレーザー加熱方式が記載されている。   Specifically, Japanese Patent Application Laid-Open No. 2004-74734 discloses a method for preheating the surface of a permeable resin material in contact with the absorbent resin material and the surface of the absorbent resin material in contact with the permeable resin material. As methods, an electromagnetic induction heating method, a heater heating method, a hot air heating method, an infrared lamp heating method, and a laser heating method are described.

また、特開２００４−１８８８０２号公報に記載された樹脂材のレーザー溶着方法では、レーザー光に対する透過性を有する樹脂材である透過性樹脂材と、レーザー光に対する透過性を有さない樹脂材である非透過性樹脂材とを加圧して接触させ、透過性樹脂材と非透過性樹脂材との当接界面に溶着用レーザー光を透過性樹脂材側から照射することにより、透過性樹脂材と非透過性樹脂材とが溶着されている。   Moreover, in the laser welding method of the resin material described in Unexamined-Japanese-Patent No. 2004-188802, the resin material which is the resin material which has the transmittance | permeability with respect to a laser beam, and the resin material which does not have the transmittance | permeability with respect to a laser beam. A non-permeable resin material is pressed and brought into contact, and a welding laser beam is irradiated from the side of the transparent resin material to the contact interface between the transparent resin material and the non-permeable resin material. And a non-permeable resin material are welded.

更に、特開２００４−１８８８０２号公報に記載された樹脂材のレーザー溶着方法では、溶着用レーザー光によって透過性樹脂材と非透過性樹脂材とが溶着される前に、非透過性樹脂材に当接する透過性樹脂材の表面、および、透過性樹脂材に当接する非透過性樹脂材の表面が、予め加熱され、軟化せしめられている。それにより、特開２００４−１８８８０２号公報に記載された樹脂材のレーザー溶着方法では、透過性樹脂材の表面と非透過性樹脂材の表面との密着性が悪い場合、つまり、透過性樹脂材の表面および非透過性樹脂材の表面に凹凸が存在する場合であっても、透過性樹脂材と吸収性樹脂材との溶着強度が向上せしめられている。   Furthermore, in the laser welding method of the resin material described in Japanese Patent Application Laid-Open No. 2004-188802, before the transmissive resin material and the non-permeable resin material are welded by the welding laser beam, the resin material is bonded to the non-permeable resin material. The surface of the permeable resin material that abuts and the surface of the non-permeable resin material that abuts the permeable resin material are preheated and softened. Thereby, in the laser welding method of the resin material described in JP-A-2004-188802, when the adhesion between the surface of the permeable resin material and the surface of the non-permeable resin material is poor, that is, the permeable resin material Even when there are irregularities on the surface of the non-permeable resin material and the surface of the non-permeable resin material, the welding strength between the permeable resin material and the absorbent resin material is improved.

具体的には、特開２００４−１８８８０２号公報には、非透過性樹脂材に当接する透過性樹脂材の表面、および、透過性樹脂材に当接する非透過性樹脂材の表面を予備加熱するための手段として、予備加熱用レーザー光、加熱部材および温風が記載されている。   Specifically, Japanese Patent Application Laid-Open No. 2004-188802 preliminarily heats the surface of a permeable resin material that contacts the non-permeable resin material and the surface of the non-permeable resin material that contacts the permeable resin material. As means for this purpose, laser light for preheating, a heating member and hot air are described.

特開２００４−７４７３４号公報JP 2004-74734 A 特開２００４−１８８８０２号公報JP 2004-188802 A

本発明者は、上述した予備加熱を行うための手段として、予備加熱用レーザー光が最も好ましいと考え、予備加熱用レーザー光の照射条件について鋭意研究を行った。   The present inventor considered that the preheating laser beam is most preferable as a means for performing the preheating described above, and conducted earnest research on the irradiation conditions of the preheating laser beam.

具体的には、まず最初に、特開２００４−１８８８０２号公報の図１に記載された場合のように、予備加熱用レーザー光のスポット径と、溶着用レーザー光のスポット径とが等しくなるように、予備加熱用レーザー光の照射条件を設定した。   Specifically, first, as described in FIG. 1 of Japanese Patent Application Laid-Open No. 2004-188802, the spot diameter of the preheating laser beam is made equal to the spot diameter of the welding laser beam. In addition, the irradiation conditions of the preheating laser beam were set.

図２は予備加熱用レーザー光のスポット径と溶着用レーザー光のスポット径とが等しくなるように予備加熱用レーザー光の照射条件が設定された実験用のレーザー溶着装置の要部を示した図である。図２において、１はレーザー光の透過率の大きい樹脂材である第１樹脂材を示しており、２はレーザー光の透過率の小さい樹脂材である第２樹脂材を示している。３は第１樹脂材と第２樹脂材との当接界面に照射される予備加熱用レーザー光を示しており、４は第１樹脂材と第２樹脂材との当接界面に照射される溶着用レーザー光を示している。   FIG. 2 is a diagram showing a main part of an experimental laser welding apparatus in which the irradiation conditions of the preheating laser beam are set so that the spot diameter of the preheating laser beam and the spot diameter of the welding laser beam are equal to each other. It is. In FIG. 2, reference numeral 1 denotes a first resin material that is a resin material having a high laser light transmittance, and reference numeral 2 denotes a second resin material that is a resin material having a low laser light transmittance. Reference numeral 3 denotes a preheating laser beam applied to the contact interface between the first resin material and the second resin material, and reference numeral 4 denotes the contact interface between the first resin material and the second resin material. The welding laser beam is shown.

図２に示すように、この実験用のレーザー溶着装置では、予備加熱用レーザー光３のスポット径と溶着用レーザー光４のスポット径とが等しくなるように予備加熱用レーザー光３の照射条件を設定し、更に、予備加熱用レーザー光３と溶着用レーザー光４とが同一の軌跡を描くように、予備加熱用レーザー光３および溶着用レーザー光４をスキャンさせた。次いで、予備加熱用レーザー光３によって予備加熱され、溶着用レーザー光４によって溶着された第１樹脂材１と第２樹脂材２との溶着部分の破断面を観察した。   As shown in FIG. 2, in this experimental laser welding apparatus, the irradiation conditions of the preheating laser beam 3 are set so that the spot diameter of the preheating laser beam 3 is equal to the spot diameter of the welding laser beam 4. Further, the preheating laser beam 3 and the welding laser beam 4 were scanned so that the preheating laser beam 3 and the welding laser beam 4 had the same locus. Next, the fracture surface of the welded portion of the first resin material 1 and the second resin material 2 preliminarily heated by the preheating laser beam 3 and welded by the welding laser beam 4 was observed.

詳細には、予備加熱用レーザー光３および溶着用レーザー光４のスキャン毎に、予備加熱用レーザー光３の出力を増減させ、第１樹脂材１と第２樹脂材２との溶着部分の破断面を観察した。   In detail, every time the preheating laser beam 3 and the welding laser beam 4 are scanned, the output of the preheating laser beam 3 is increased or decreased to break the welded portion between the first resin material 1 and the second resin material 2. The cross section was observed.

図３は第１樹脂材１と第２樹脂材２との溶着部分の破断面を概念的に示した図である。詳細には、図３（Ａ）は予備加熱用レーザー光３の出力が適切な場合における第１樹脂材１と第２樹脂材２との溶着部分の破断面を示している。図３（Ｂ）は予備加熱用レーザー光３の出力が小さすぎる場合における第１樹脂材１と第２樹脂材２との溶着部分の破断面を示している。図３（Ｃ）は予備加熱用レーザー光３の出力が大きすぎる場合における第１樹脂材１と第２樹脂材２との溶着部分の破断面を示している。   FIG. 3 is a diagram conceptually showing a fracture surface of a welded portion between the first resin material 1 and the second resin material 2. Specifically, FIG. 3A shows a fracture surface of the welded portion between the first resin material 1 and the second resin material 2 when the output of the preheating laser beam 3 is appropriate. FIG. 3B shows a fracture surface of the welded portion between the first resin material 1 and the second resin material 2 when the output of the preheating laser beam 3 is too small. FIG. 3C shows a fracture surface of the welded portion between the first resin material 1 and the second resin material 2 when the output of the preheating laser beam 3 is too large.

図３（Ａ）に示すように、予備加熱用レーザー光３の出力が適切な場合には、スキャンせしめられた溶着用レーザー光４の軌跡の幅Ｗ１の全体にわたって、第１樹脂材１および第２樹脂材２の材料破壊が見られた。また、予備加熱用レーザー光３の出力が適切な場合には、第１樹脂材１と第２樹脂材２とが高い強度で溶着されることが確認された。   As shown in FIG. 3 (A), when the output of the preheating laser beam 3 is appropriate, the first resin material 1 and the first resin material 1 and the second resin beam 1 are scanned over the entire width W1 of the trajectory of the welding laser beam 4 scanned. 2 Material destruction of the resin material 2 was observed. It was also confirmed that when the output of the preheating laser beam 3 was appropriate, the first resin material 1 and the second resin material 2 were welded with high strength.

図３（Ａ）に示す溶着部分においては、予備加熱用レーザー光３および溶着用レーザー光４のエネルギー密度が均一になっており、その結果、第１樹脂材１および第２樹脂材２が均一に溶融・膨張せしめられていると考えられる。   3A, the energy density of the preheating laser beam 3 and the welding laser beam 4 is uniform, and as a result, the first resin material 1 and the second resin material 2 are uniform. It is thought that it is melted and expanded.

一方、図３（Ｂ）に示すように、予備加熱用レーザー光３の出力が小さすぎる場合には、スキャンせしめられた溶着用レーザー光４の軌跡の幅Ｗ１よりも、第１樹脂材１および第２樹脂材２の材料破壊が起こった部分の幅Ｗ２が狭くなってしまうことが確認された。すなわち、予備加熱用レーザー光３の出力が小さすぎる場合には、実際に溶着された部分の幅Ｗ２が、溶着されるべき部分の幅Ｗ１よりも狭くなってしまい、その結果、第１樹脂材１と第２樹脂材２との溶着強度が低くなってしまうことが確認された。   On the other hand, as shown in FIG. 3B, when the output of the preheating laser beam 3 is too small, the first resin material 1 and the width W1 of the trajectory of the welding laser beam 4 scanned are It was confirmed that the width W2 of the portion where the material destruction of the second resin material 2 occurred was narrowed. That is, when the output of the preheating laser beam 3 is too small, the width W2 of the actually welded portion becomes narrower than the width W1 of the portion to be welded. As a result, the first resin material It was confirmed that the welding strength between 1 and the second resin material 2 was lowered.

図３（Ｂ）に示す溶着部分においては、予備加熱用レーザー光３および溶着用レーザー光４のエネルギー密度が不均一になっており、第１樹脂材１および第２樹脂材２が不均一に溶融・膨張せしめられていると考えられる。   In the welding portion shown in FIG. 3B, the energy density of the preheating laser beam 3 and the welding laser beam 4 is non-uniform, and the first resin material 1 and the second resin material 2 are non-uniform. It is thought that it has been melted and expanded.

また、図３（Ｃ）に示すように、予備加熱用レーザー光３の出力が大きすぎる場合には、第２樹脂材２が異常に溶融・膨張せしめられ、その結果、スキャンせしめられた溶着用レーザー光４の軌跡（Ｗ１）から、溶融・膨張せしめられた第２樹脂材２’がはみ出してしまうことが確認された。   Further, as shown in FIG. 3C, when the output of the preheating laser beam 3 is too large, the second resin material 2 is abnormally melted and expanded, and as a result, the scanned welding is performed. From the locus (W1) of the laser beam 4, it was confirmed that the melted and expanded second resin material 2 ′ protruded.

このように、スキャンせしめられた溶着用レーザー光４の軌跡（Ｗ１）から第２樹脂材２’がはみ出してしまうことなく、第１樹脂材１と第２樹脂材２とを高い強度で溶着するためには、予備加熱用レーザー光３の出力を適切な値に設定しなければならないことがわかった。   In this manner, the first resin material 1 and the second resin material 2 are welded with high strength without the second resin material 2 ′ protruding from the trajectory (W 1) of the welding laser beam 4 that has been scanned. For this purpose, it has been found that the output of the preheating laser beam 3 must be set to an appropriate value.

更に、本発明者の鋭意研究において、互いに溶着される第１樹脂材１および第２樹脂材２のペア毎に、予備加熱用レーザー光３の出力の適切な値が微妙に変化することがわかった。このように、互いに溶着される第１樹脂材１および第２樹脂材２のペア毎に予備加熱用レーザー光の出力の適切な値が微妙に変化する理由としては、互いに溶着される第１樹脂材１および第２樹脂材２のペア毎に、第２樹脂材２に当接する第１樹脂材１の表面に存在している凹部の大きさが微妙に異なっているためであると考えられる。   Furthermore, in earnest research of the inventor, it is found that the appropriate value of the output of the preheating laser beam 3 slightly changes for each pair of the first resin material 1 and the second resin material 2 that are welded to each other. It was. As described above, the reason why the appropriate value of the preheating laser beam output slightly changes for each pair of the first resin material 1 and the second resin material 2 to be welded to each other is that the first resin to be welded to each other. This is considered to be because the size of the recesses present on the surface of the first resin material 1 in contact with the second resin material 2 is slightly different for each pair of the material 1 and the second resin material 2.

図４は第２樹脂材２に当接する第１樹脂材１の表面に存在している凹部１’を概念的に示した図である。詳細には、図４（Ａ）は予備加熱用レーザー光３が照射される前における第２樹脂材２に当接する第１樹脂材１の表面の凹部１’を示した図である。図４（Ｂ）は予備加熱用レーザー光３が照射された後における第２樹脂材２に当接する第１樹脂材１の表面の凹部１’を示した図である。   FIG. 4 is a view conceptually showing the concave portion 1 ′ existing on the surface of the first resin material 1 in contact with the second resin material 2. Specifically, FIG. 4A is a view showing a concave portion 1 ′ on the surface of the first resin material 1 that contacts the second resin material 2 before the preheating laser beam 3 is irradiated. FIG. 4B is a view showing a concave portion 1 ′ on the surface of the first resin material 1 that comes into contact with the second resin material 2 after the preheating laser beam 3 is irradiated.

図４に示すように、予備加熱用レーザー光３が照射されると、第２樹脂材２が溶融せしめられて膨張し、その結果、第１樹脂材１の表面に存在していた凹部１’が、その溶融・膨張せしめられた第２樹脂材２’によって埋められると考えられる。   As shown in FIG. 4, when the preheating laser beam 3 is irradiated, the second resin material 2 is melted and expanded, and as a result, the concave portion 1 ′ present on the surface of the first resin material 1. However, it is considered that it is filled with the melted and expanded second resin material 2 '.

つまり、互いに溶着される第１樹脂材１および第２樹脂材２のペア毎に、第１樹脂材１の表面の凹部１’の大きさが異なれば、その凹部１’を埋めるのに必要な第２樹脂材２’の量が異なってくると考えられ、また、その第２樹脂材２’を溶融・膨張させるのに必要な予備加熱用レーザー光３の出力が異なってくると考えられる。   That is, if the size of the concave portion 1 ′ on the surface of the first resin material 1 is different for each pair of the first resin material 1 and the second resin material 2 that are welded to each other, it is necessary to fill the concave portion 1 ′. The amount of the second resin material 2 ′ is considered to be different, and the output of the preheating laser beam 3 necessary for melting and expanding the second resin material 2 ′ is considered to be different.

このような理由から、上述したように、予備加熱用レーザー光３の出力の適切な値が、第２樹脂材２に当接する第１樹脂材１の表面に存在している凹部１’の大きさに依存して変化すると考えられる。換言すれば、互いに溶着される第１樹脂材１および第２樹脂材２のペア毎に、予備加熱用レーザー光３の出力の適切な値が変化すると考えられる。   For this reason, as described above, an appropriate value of the output of the preheating laser beam 3 is the size of the concave portion 1 ′ that exists on the surface of the first resin material 1 in contact with the second resin material 2. It is thought to change depending on the size. In other words, it is considered that the appropriate value of the output of the preheating laser beam 3 changes for each pair of the first resin material 1 and the second resin material 2 that are welded to each other.

このように、本発明者の鋭意研究により、特開２００４−１８８８０２号公報の図１に記載された場合のように予備加熱用レーザー光３のスポット径と溶着用レーザー光４のスポット径とを等しい値に設定すると、予備加熱用レーザー光３の出力を適切な値に維持するのが非常に難しくなることがわかった。   Thus, as a result of diligent research by the present inventor, the spot diameter of the preheating laser beam 3 and the spot diameter of the welding laser beam 4 as shown in FIG. 1 of Japanese Patent Application Laid-Open No. 2004-188802 are obtained. It was found that when the values were set equal, it was very difficult to maintain the output of the preheating laser beam 3 at an appropriate value.

また、特開２００４−１８８８０２号公報の図１に記載された場合のように予備加熱用レーザー光３のスポット径と溶着用レーザー光４のスポット径とを等しい値に設定すると、溶着用レーザー光４の軌跡が曲線を描くように溶着用レーザー光４がスキャンせしめられる場合に、予備加熱用レーザー光３の軌跡と溶着用レーザー光４の軌跡とがずれてしまうおそれが高くなる。このように、予備加熱用レーザー光３の軌跡と溶着用レーザー光４の軌跡とがずれてしまうと、図３（Ｂ）に示したように、実際に溶着された部分の幅Ｗ２が、溶着されるべき部分の幅Ｗ１よりも狭くなってしまい、その結果、第１樹脂材１と第２樹脂材２との溶着強度が低くなってしまう。   Further, when the spot diameter of the preheating laser beam 3 and the spot diameter of the welding laser beam 4 are set to the same value as described in FIG. 1 of JP-A-2004-188802, the welding laser beam is set. When the welding laser beam 4 is scanned so that the locus 4 is curved, there is a high possibility that the locus of the preheating laser beam 3 and the locus of the welding laser beam 4 are shifted. In this way, when the locus of the preheating laser beam 3 and the locus of the welding laser beam 4 are shifted, as shown in FIG. 3B, the width W2 of the actually welded portion is welded. As a result, the welding strength between the first resin material 1 and the second resin material 2 becomes low.

これらの問題点を解決するために鋭意研究を行った結果、本発明者は、予備加熱用レーザー光３のスポット径を溶着用レーザー光４のスポット径よりも大きくすることにより、上述した問題点を解決できることを見出した。   As a result of diligent research to solve these problems, the present inventor made the above-mentioned problems by making the spot diameter of the preheating laser beam 3 larger than the spot diameter of the welding laser beam 4. It was found that can be solved.

詳細には、予備加熱用レーザー光３のスポット径を溶着用レーザー光４のスポット径よりも大きくすることにより、図３（Ｂ）に示したように実際に溶着された部分の幅Ｗ２が溶着されるべき部分の幅Ｗ１よりも狭くなってしまうおそれを低減することができた。   Specifically, by making the spot diameter of the preheating laser beam 3 larger than the spot diameter of the welding laser beam 4, the width W2 of the actually welded portion is welded as shown in FIG. The possibility of becoming narrower than the width W1 of the portion to be formed could be reduced.

また、予備加熱用レーザー光３のスポット径を溶着用レーザー光４のスポット径よりも大きくすることにより、図３（Ｃ）に示したようにスキャンせしめられた溶着用レーザー光４の軌跡（Ｗ１）から溶融・膨張せしめられた第２樹脂材２’がはみ出してしまうおそれを低減することができた。   Further, by making the spot diameter of the preheating laser beam 3 larger than the spot diameter of the welding laser beam 4, the trajectory (W1) of the welding laser beam 4 scanned as shown in FIG. ), The possibility that the second resin material 2 ′ melted and expanded would protrude.

更に、予備加熱用レーザー光３のスポット径を溶着用レーザー光４のスポット径よりも大きくすることにより、溶着用レーザー光４の軌跡が曲線を描くように溶着用レーザー光４がスキャンせしめられる場合に、図３（Ｂ）に示したように実際に溶着された部分の幅Ｗ２が溶着されるべき部分の幅Ｗ１よりも狭くなってしまうおそれを低減することができた。   Further, when the spot diameter of the preheating laser beam 3 is made larger than the spot diameter of the welding laser beam 4, the welding laser beam 4 is scanned so that the locus of the welding laser beam 4 is curved. In addition, as shown in FIG. 3B, the possibility that the width W2 of the actually welded portion becomes narrower than the width W1 of the portion to be welded can be reduced.

具体的には、本発明者の鋭意研究において、予備加熱用レーザー光３のスポット径を溶着用レーザー光４のスポット径の約２〜２０倍に設定した場合に、上述した効果を得ることができた。   Specifically, in the earnest study of the inventor, when the spot diameter of the preheating laser beam 3 is set to about 2 to 20 times the spot diameter of the welding laser beam 4, the above-described effect can be obtained. did it.

以上のように、本発明は、実際に溶着された部分の幅が溶着されるべき部分の幅よりも狭くなってしまうおそれを低減しつつ、スキャンせしめられた溶着用レーザー光の軌跡から溶融・膨張せしめられた樹脂材がはみ出してしまうおそれを低減することができる樹脂材のレーザー溶着方法を提供することを目的とする。   As described above, the present invention reduces the possibility that the width of the actually welded portion will be narrower than the width of the portion to be welded, while melting from the trajectory of the welding laser beam scanned. It is an object of the present invention to provide a laser welding method for a resin material that can reduce the risk of the expanded resin material protruding.

請求項１に記載の発明によれば、レーザー光の透過率の大きい樹脂材である第１樹脂材と、レーザー光の透過率の小さい樹脂材である第２樹脂材とを加圧して接触させ、前記第１樹脂材と前記第２樹脂材との当接界面に溶着用レーザー光を第１樹脂材側から照射することにより、前記第１樹脂材と前記第２樹脂材とを溶着するようにした樹脂材のレーザー溶着方法において、溶着用レーザー光を前記第１樹脂材と前記第２樹脂材との当接界面に照射する工程の前に、予備加熱用レーザー光を前記第１樹脂材と前記第２樹脂材との当接界面に照射する工程を設け、予備加熱用レーザー光のスポット径を溶着用レーザー光のスポット径より大きくしたことを特徴とする樹脂材のレーザー溶着方法が提供される。   According to the first aspect of the present invention, the first resin material that is a resin material having a high laser light transmittance and the second resin material that is a resin material having a low laser light transmittance are pressed and brought into contact with each other. The first resin material and the second resin material are welded by irradiating a welding laser beam to the contact interface between the first resin material and the second resin material from the first resin material side. In the laser welding method of the resin material, the preheating laser beam is applied to the first resin material before the step of irradiating the contact laser beam between the first resin material and the second resin material. There is provided a laser welding method for a resin material, characterized in that a step of irradiating the contact interface between the first resin material and the second resin material is provided, and the spot diameter of the laser beam for preheating is larger than the spot diameter of the laser beam for welding. Is done.

請求項２に記載の発明によれば、予備加熱用レーザー光のスポット径を溶着用レーザー光のスポット径の約２〜２０倍に設定したことを特徴とする請求項１に記載の樹脂材のレーザー溶着方法が提供される。   According to invention of Claim 2, the spot diameter of the laser beam for preheating was set to about 2 to 20 times the spot diameter of the laser beam for welding, The resin material of Claim 1 characterized by the above-mentioned A laser welding method is provided.

請求項３に記載の発明によれば、予備加熱用レーザー光を照射するための予備加熱用集光レンズを、溶着用レーザー光を照射するための溶着用集光レンズよりも前記第１樹脂材および前記第２樹脂材に近接させることにより、予備加熱用レーザー光のスポット径を溶着用レーザー光のスポット径より大きくしたことを特徴とする請求項１又は２に記載の樹脂材のレーザー溶着方法が提供される。   According to the invention described in claim 3, the first resin material is used for the preheating condensing lens for irradiating the preheating laser light, rather than the welding condensing lens for irradiating the welding laser light. 3. The method of laser welding a resin material according to claim 1, wherein the spot diameter of the preheating laser beam is made larger than the spot diameter of the laser beam for welding by being brought close to the second resin material. Is provided.

請求項４に記載の発明によれば、予備加熱用レーザー光を照射するための予備加熱用集光レンズから前記第１樹脂材および前記第２樹脂材までの距離を変更することにより、予備加熱用レーザー光のスポット径を変更することを特徴とする請求項１〜３のいずれか一項に記載の樹脂材のレーザー溶着方法が提供される。   According to the invention described in claim 4, the preheating is performed by changing the distance from the preheating condensing lens for irradiating the preheating laser beam to the first resin material and the second resin material. The method for laser welding a resin material according to any one of claims 1 to 3, wherein the spot diameter of the laser beam for use is changed.

請求項１及び２に記載の樹脂材のレーザー溶着方法では、レーザー光の透過率の大きい樹脂材である第１樹脂材と、レーザー光の透過率の小さい樹脂材である第２樹脂材との当接界面に溶着用レーザー光を照射する工程の前に、第１樹脂材と第２樹脂材との当接界面に予備加熱用レーザー光を照射する工程が設けられている。詳細には、溶着用レーザー光が照射せしめられる前に、第１樹脂材と第２樹脂材とが互いに圧接せしめられ、更に、第２樹脂材に当接する第１樹脂材の表面、および、第１樹脂材に当接する第２樹脂材の表面が、予備加熱用レーザー光によって予め加熱されて軟化せしめられ、その結果、それらの表面の間に存在している隙間が予め埋められる。そのため、予備加熱用レーザー光の照射工程が設けられていない場合よりも、予備加熱用レーザー光の照射工程後の溶着用レーザー光の照射工程によって溶着された第１樹脂材と第２樹脂材との溶着強度を向上させることができる。   In the laser welding method of the resin material of Claim 1 and 2, the 1st resin material which is a resin material with a large laser beam transmittance, and the second resin material which is a resin material with a low laser beam transmittance Before the step of irradiating the contact interface with the welding laser beam, a step of irradiating the contact interface between the first resin material and the second resin material with the preheating laser beam is provided. Specifically, before the welding laser light is irradiated, the first resin material and the second resin material are pressed against each other, and the surface of the first resin material that contacts the second resin material, and The surface of the second resin material in contact with the one resin material is preheated and softened by the preheating laser beam, and as a result, the gap existing between these surfaces is filled in advance. Therefore, the first resin material and the second resin material welded by the welding laser light irradiation step after the preheating laser light irradiation step are provided, compared to the case where the preheating laser light irradiation step is not provided. The welding strength can be improved.

更に、請求項１及び２に記載の樹脂材レーザー溶着方法では、予備加熱用レーザー光のスポット径が、溶着用レーザー光のスポット径より大きくされている。好ましくは、予備加熱用レーザー光のスポット径が溶着用レーザー光のスポット径の約２〜２０倍に設定されている。そのため、予備加熱用レーザー光のスポット径と溶着用レーザー光のスポット径とが等しくされている場合のように、実際に溶着された部分の幅が溶着されるべき部分の幅よりも狭くなってしまうおそれを低減することができる。更に、予備加熱用レーザー光のスポット径と溶着用レーザー光のスポット径とが等しくされている場合のように、スキャンせしめられた溶着用レーザー光の軌跡から溶融・膨張せしめられた樹脂材がはみ出してしまうおそれを低減することができる。   Furthermore, in the resin material laser welding method according to claims 1 and 2, the spot diameter of the preheating laser beam is made larger than the spot diameter of the welding laser beam. Preferably, the spot diameter of the preheating laser beam is set to about 2 to 20 times the spot diameter of the welding laser beam. Therefore, as in the case where the spot diameter of the preheating laser beam and the spot diameter of the welding laser beam are equal, the width of the actually welded portion is narrower than the width of the portion to be welded. This can reduce the risk of being lost. Furthermore, the resin material melted and expanded from the locus of the welding laser beam scanned, as in the case where the spot diameter of the laser beam for preheating is equal to the spot diameter of the welding laser beam, protrudes. The risk of being lost can be reduced.

請求項３に記載の樹脂材のレーザー溶着方法では、予備加熱用レーザー光を照射するための予備加熱用集光レンズを、溶着用レーザー光を照射するための溶着用集光レンズよりも第１樹脂材および第２樹脂材に近接させることにより、予備加熱用レーザー光のスポット径が溶着用レーザー光のスポット径より大きくされている。そのため、予備加熱用集光レンズおよび溶着用集光レンズとして同一の集光レンズを用いつつ、予備加熱用レーザー光のスポット径を溶着用レーザー光のスポット径より大きくすることができる。つまり、予備加熱用レーザー光のスポット径を溶着用レーザー光のスポット径より大きくするために、溶着用集光レンズとは異なる集光レンズを予備加熱用集光レンズとして用意する必要性を排除することができる。   In the laser welding method of the resin material according to claim 3, the preheating condensing lens for irradiating the preheating laser beam is more first than the welding condensing lens for irradiating the welding laser light. By making it adjoin to the resin material and the 2nd resin material, the spot diameter of the laser beam for preheating is made larger than the spot diameter of the laser beam for welding. Therefore, the spot diameter of the preheating laser beam can be made larger than the spot diameter of the welding laser beam while using the same condensing lens as the preheating condensing lens and the welding condensing lens. In other words, in order to make the spot diameter of the preheating laser beam larger than the spot diameter of the welding laser beam, the need to prepare a condensing lens different from the welding condensing lens as the preheating condensing lens is eliminated. be able to.

請求項４に記載の樹脂材のレーザー溶着方法では、予備加熱用レーザー光を照射するための予備加熱用集光レンズから第１樹脂材および第２樹脂材までの距離を変更することにより、予備加熱用レーザー光のスポット径が変更される。そのため、予備加熱用集光レンズを交換することなく、予備加熱用レーザー光のスポット径を変更することができる。つまり、予備加熱用レーザー光のスポット径を変更するために、予備加熱用集光レンズを異なる集光レンズに交換する必要性を排除することができる。   In the laser welding method of the resin material according to claim 4, by changing the distance from the preheating condensing lens for irradiating the preheating laser beam to the first resin material and the second resin material, The spot diameter of the heating laser beam is changed. Therefore, the spot diameter of the preheating laser beam can be changed without replacing the preheating condenser lens. That is, it is possible to eliminate the necessity of replacing the preheating condenser lens with a different condenser lens in order to change the spot diameter of the preheating laser beam.

以下、本発明の樹脂材のレーザー溶着装置の第１の実施形態について説明する。図１は第１の実施形態の樹脂材のレーザー溶着装置の概略構成図である。図１において、１１は予備加熱用レーザー光３を照射するための予備加熱用集光レンズを示しており、１２は溶着用レーザー光４を照射するための溶着用集光レンズを示している。第１の実施形態の樹脂材のレーザー溶着装置では、レーザー光の透過率の大きい樹脂材である第１樹脂材１と、レーザー光の透過率の小さい樹脂材である第２樹脂材２との当接界面に照射される予備加熱用レーザー光のエネルギー密度を均一にするためのアッテネータ１１’が、予備加熱用集光レンズ１１に設けられている。   Hereinafter, a first embodiment of a laser welding apparatus for resin material according to the present invention will be described. FIG. 1 is a schematic configuration diagram of a laser welding apparatus for resin material according to the first embodiment. In FIG. 1, reference numeral 11 denotes a preheating condensing lens for irradiating the preheating laser beam 3, and 12 denotes a welding condensing lens for irradiating the welding laser light 4. In the laser welding apparatus for resin material according to the first embodiment, the first resin material 1 which is a resin material having a high laser light transmittance and the second resin material 2 which is a resin material having a low laser light transmittance. An attenuator 11 ′ for making the energy density of the preheating laser beam irradiated to the contact interface uniform is provided in the preheating condenser lens 11.

更に、図１において、１３は分配器を示しており、１４は半導体レーザー発振器を示している。１５は予備加熱用集光レンズ１１、溶着用集光レンズ１２、分配器１３および半導体レーザー発振器１４を接続するための光ファイバーを示している。   Further, in FIG. 1, reference numeral 13 denotes a distributor, and reference numeral 14 denotes a semiconductor laser oscillator. Reference numeral 15 denotes an optical fiber for connecting the preheating condensing lens 11, the welding condensing lens 12, the distributor 13, and the semiconductor laser oscillator 14.

第１の実施形態の樹脂材のレーザー溶着装置は、アッテネータ１１’によって予備加熱用レーザー光３の出力を変更できるように構成されているが、通常は、予備加熱用レーザー光３の出力と溶着用レーザー光４の出力とが等しくなるように設定されている。   The resin material laser welding apparatus according to the first embodiment is configured so that the output of the preheating laser beam 3 can be changed by the attenuator 11 ′. Usually, the output and welding of the preheating laser beam 3 are used. The output of the laser beam 4 for use is set to be equal.

第１の実施形態の樹脂材のレーザー溶着装置では、例えば透明樹脂材のようなレーザー光の透過率の大きい第１樹脂材１と、例えば非透明樹脂材のようなレーザー光の透過率の小さい第２樹脂材２とがレーザー溶着される。   In the laser welding apparatus for resin material according to the first embodiment, the first resin material 1 having a high laser beam transmittance such as a transparent resin material and the laser beam transmittance such as a non-transparent resin material are small. The second resin material 2 is laser welded.

具体的には、まず最初に、図１に示すように、第１樹脂材１と第２樹脂材２とが加圧して接触せしめられる。次いで、予備加熱用レーザー光３が、スキャンせしめられ、第１樹脂材１と第２樹脂材２との当接界面に第１樹脂材１の側から照射される。その結果、第１樹脂材１と第２樹脂材２との当接界面が予備加熱される。次いで、溶着用レーザー光４が、スキャンせしめられ、第１樹脂材１と第２樹脂材２との当接界面に第１樹脂材１の側から照射される。その結果、第１樹脂材１と第２樹脂材２との当接界面がレーザー溶着される。   Specifically, first, as shown in FIG. 1, the first resin material 1 and the second resin material 2 are pressurized and brought into contact with each other. Next, the preheating laser beam 3 is scanned and applied to the contact interface between the first resin material 1 and the second resin material 2 from the first resin material 1 side. As a result, the contact interface between the first resin material 1 and the second resin material 2 is preheated. Next, the welding laser beam 4 is scanned and applied to the contact interface between the first resin material 1 and the second resin material 2 from the first resin material 1 side. As a result, the contact interface between the first resin material 1 and the second resin material 2 is laser-welded.

詳細には、第１の実施形態の樹脂材のレーザー溶着装置では、第１樹脂材１と第２樹脂材２とが互いに溶着される部分の幅（つまり、第１樹脂材１および第２樹脂材２の材料破壊が起こる部分の幅）と溶着用レーザー光４のスポット径とがほぼ等しくなるように、溶着用レーザー光４のスポット径が設定されている。   Specifically, in the laser welding apparatus for resin material according to the first embodiment, the width of the portion where the first resin material 1 and the second resin material 2 are welded to each other (that is, the first resin material 1 and the second resin material). The spot diameter of the welding laser beam 4 is set so that the width of the portion of the material 2 where the material breakage occurs is substantially equal to the spot diameter of the welding laser beam 4.

更に、第１の実施形態の樹脂材のレーザー溶着装置では、図１に示すように、予備加熱用レーザー光３のスポット径が、溶着用レーザー光４のスポット径よりも大きくされている。詳細には、予備加熱用集光レンズ１１を溶着用集光レンズ１２よりも第１樹脂材１と第２樹脂材２との当接界面に近接させることにより、つまり、予備加熱用集光レンズ１１を溶着用集光レンズ１２よりも図１の下側に配置することにより、予備加熱用レーザー光３のスポット径が溶着用レーザー光４のスポット径よりも大きくされている。   Further, in the laser welding apparatus for resin material according to the first embodiment, as shown in FIG. 1, the spot diameter of the preheating laser beam 3 is made larger than the spot diameter of the welding laser beam 4. Specifically, the preheating condensing lens 11 is brought closer to the contact interface between the first resin material 1 and the second resin material 2 than the welding condensing lens 12, that is, the preheating condensing lens. 11 is arranged below the welding condensing lens 12 in FIG. 1, so that the spot diameter of the preheating laser beam 3 is made larger than the spot diameter of the welding laser beam 4.

更に詳細には、第１の実施形態の樹脂材のレーザー溶着装置では、予備加熱用レーザー光３のスポット径が、溶着用レーザー光４のスポット径の約２〜２０倍に設定されている。換言すれば、第１の実施形態の樹脂材のレーザー溶着装置では、図３（Ｂ）に示したように実際に溶着された部分の幅Ｗ２が溶着されるべき部分の幅Ｗ１よりも狭くならないように、かつ、図３（Ｃ）に示したようにスキャンせしめられた溶着用レーザー光４の軌跡（Ｗ１）から溶融・膨張せしめられた第２樹脂材２’がはみ出さないように、予備加熱用レーザー光３のスポット径が溶着用レーザー光４のスポット径の約２〜２０倍に設定されている。   More specifically, in the laser welding apparatus for resin material according to the first embodiment, the spot diameter of the preheating laser beam 3 is set to about 2 to 20 times the spot diameter of the welding laser beam 4. In other words, in the laser welding apparatus for resin material according to the first embodiment, as shown in FIG. 3B, the width W2 of the actually welded portion is not narrower than the width W1 of the portion to be welded. In order to prevent the second resin material 2 ′ melted and expanded from the locus (W1) of the welding laser beam 4 scanned as shown in FIG. The spot diameter of the heating laser beam 3 is set to about 2 to 20 times the spot diameter of the welding laser beam 4.

更に、第１の実施形態の樹脂材のレーザー溶着装置では、予備加熱用集光レンズ１１から第１樹脂材１および第２樹脂材２までの距離を変更することにより、つまり、予備加熱用集光レンズ１１を図１の上下方向に移動させることにより、予備加熱用レーザー光３のスポット径が変更される。   Furthermore, in the laser welding apparatus for resin material according to the first embodiment, by changing the distance from the preheating condensing lens 11 to the first resin material 1 and the second resin material 2, that is, the preheating collector. The spot diameter of the preheating laser beam 3 is changed by moving the optical lens 11 in the vertical direction in FIG.

また、第１の実施形態の樹脂材のレーザー溶着装置では、予備加熱用レーザー光３が照射されると第２樹脂材２の温度が第２樹脂材２の熱変形温度近くまで上昇するように、予備加熱用レーザー光３の出力が設定されている。   Further, in the laser welding apparatus for resin material according to the first embodiment, when the preheating laser beam 3 is irradiated, the temperature of the second resin material 2 rises to near the thermal deformation temperature of the second resin material 2. The output of the preheating laser beam 3 is set.

第１の実施形態の樹脂材のレーザー溶着装置では、上述したように、予備加熱用レーザー光３のスポット径が溶着用レーザー光４のスポット径よりも大きくされているため、溶着されるべき部分（Ｗ１）（図３参照）のみならず、その近傍が加熱され、第２樹脂材２の温度が第２樹脂材２の熱変形温度近くまで上昇する。その結果、溶着されるべき部分（Ｗ１）（図３参照）の全体が均一に溶融せしめられ、第１樹脂材１と第２樹脂材２とが溶着されると考えられる。   In the laser welding apparatus for resin material according to the first embodiment, as described above, the spot diameter of the preheating laser beam 3 is larger than the spot diameter of the laser beam 4 for welding. Not only (W1) (see FIG. 3) but also the vicinity thereof is heated, and the temperature of the second resin material 2 rises to near the thermal deformation temperature of the second resin material 2. As a result, it is considered that the entire portion (W1) (see FIG. 3) to be welded is melted uniformly, and the first resin material 1 and the second resin material 2 are welded.

詳細には、第１の実施形態の樹脂材のレーザー溶着装置では、溶着されるべき部分（Ｗ１）（図３参照）の全体で第１樹脂材１および第２樹脂材２が材料破壊を起こしていると考えられる。また、溶着されるべき部分（Ｗ１）（図３参照）のみならず、その近傍が均一に予備加熱されるため、図３（Ｃ）に示したようにスキャンせしめられた溶着用レーザー光４の軌跡（Ｗ１）から溶融・膨張せしめられた第２樹脂材２’がはみ出してしまうことがないと考えられる。   Specifically, in the laser welding apparatus for resin material according to the first embodiment, the first resin material 1 and the second resin material 2 cause material destruction in the entire portion (W1) (see FIG. 3) to be welded. It is thought that. Further, since not only the portion (W1) to be welded (see FIG. 3) but also the vicinity thereof is preheated uniformly, the welding laser beam 4 scanned as shown in FIG. It is considered that the second resin material 2 ′ melted and expanded from the locus (W1) does not protrude.

更に、第１の実施形態の樹脂材のレーザー溶着装置では、溶着されるべき部分（Ｗ１）（図３参照）のみならず、その近傍もアニール状態になるため、第１樹脂材１および第２樹脂材２の内部ストレスを減少させることができると考えられる。   Furthermore, in the laser welding apparatus for resin material according to the first embodiment, not only the portion (W1) to be welded (see FIG. 3) but also the vicinity thereof is in an annealed state. It is thought that the internal stress of the resin material 2 can be reduced.

また、第１の実施形態の樹脂材のレーザー溶着装置では、上述したように、予備加熱用レーザー光３のスポット径が溶着用レーザー光４のスポット径よりも大きくされているため、溶着用レーザー光４の軌跡が曲線を描くように溶着用レーザー光４がスキャンせしめられる場合に、図３（Ｂ）に示したように実際に溶着された部分の幅Ｗ２が溶着されるべき部分の幅Ｗ１よりも狭くなってしまうおそれを低減することができる。   Further, in the laser welding apparatus for resin material according to the first embodiment, as described above, the spot diameter of the preheating laser beam 3 is larger than the spot diameter of the welding laser beam 4, so that the welding laser is used. When the welding laser beam 4 is scanned so that the locus of the light 4 draws a curve, the width W2 of the actually welded portion as shown in FIG. 3B is the width W1 of the portion to be welded. The risk of becoming narrower than that can be reduced.

第１の実施形態の樹脂材のレーザー溶着装置では、図１に示すように、予備加熱用集光レンズ１１と溶着用集光レンズ１２とが一体化せしめられ、予備加熱用レーザー光３のスキャンおよび溶着用レーザー４のスキャンが同時に行われるが、第２の実施形態の樹脂材のレーザー溶着装置では、代わりに、予備加熱用集光レンズ１１と溶着用集光レンズ１２とを分離させ、時間の間隔をあけて予備加熱用レーザー光３のスキャンおよび溶着用レーザー４のスキャンを行うことも可能である。   In the laser welding apparatus for resin material according to the first embodiment, as shown in FIG. 1, the preheating condensing lens 11 and the welding condensing lens 12 are integrated to scan the preheating laser beam 3. And the welding laser 4 are simultaneously scanned. However, in the laser welding apparatus for resin material according to the second embodiment, the preheating condenser lens 11 and the welding condenser lens 12 are separated, and the time It is also possible to scan the preheating laser beam 3 and the welding laser 4 at intervals of.

本発明の樹脂材のレーザー溶着方法は、例えば樹脂製のリアコンビネーションランプ、ヘッドランプ、フォグランプなどの溶着に適用可能である。また、本発明の樹脂材のレーザー溶着方法は、例えばＬＥＤ、時計、一般照明装置などの樹脂製カバーの溶着に適用可能である。   The laser welding method of the resin material of the present invention can be applied to welding of a resin rear combination lamp, a headlamp, a fog lamp, and the like. Moreover, the laser welding method of the resin material of this invention is applicable to welding of resin covers, such as LED, a timepiece, a general lighting device, for example.

第１の実施形態の樹脂材のレーザー溶着装置の概略構成図である。It is a schematic block diagram of the laser welding apparatus of the resin material of 1st Embodiment. 予備加熱用レーザー光のスポット径と溶着用レーザー光のスポット径とが等しくなるように予備加熱用レーザー光の照射条件が設定された実験用のレーザー溶着装置の要部を示した図である。It is the figure which showed the principal part of the laser welding apparatus for an experiment in which the irradiation conditions of the laser beam for preheating were set so that the spot diameter of the laser beam for preheating and the spot diameter of the laser beam for welding might become equal. 第１樹脂材１と第２樹脂材２との溶着部分の破断面を概念的に示した図である。2 is a diagram conceptually showing a fracture surface of a welded portion between a first resin material 1 and a second resin material 2. FIG. 第２樹脂材２に当接する第１樹脂材１の表面に存在している凹部１’を概念的に示した図である。FIG. 3 is a view conceptually showing a concave portion 1 ′ existing on the surface of a first resin material 1 in contact with a second resin material 2.

符号の説明Explanation of symbols

１ 第１樹脂材
２ 第２樹脂材
３ 予備加熱用レーザー光
４ 溶着用レーザー光 DESCRIPTION OF SYMBOLS 1 1st resin material 2 2nd resin material 3 Laser beam for preheating 4 Laser beam for welding

Claims (4)

レーザー光の透過率の大きい樹脂材である第１樹脂材と、レーザー光の透過率の小さい樹脂材である第２樹脂材とを加圧して接触させ、前記第１樹脂材と前記第２樹脂材との当接界面に溶着用レーザー光を第１樹脂材側から照射することにより、前記第１樹脂材と前記第２樹脂材とを溶着するようにした樹脂材のレーザー溶着方法において、溶着用レーザー光を前記第１樹脂材と前記第２樹脂材との当接界面に照射する工程の前に、予備加熱用レーザー光を前記第１樹脂材と前記第２樹脂材との当接界面に照射する工程を設け、予備加熱用レーザー光のスポット径を溶着用レーザー光のスポット径より大きくしたことを特徴とする樹脂材のレーザー溶着方法。   A first resin material that is a resin material having a high laser light transmittance and a second resin material that is a resin material having a low laser light transmittance are pressed and brought into contact with each other, and the first resin material and the second resin In a laser welding method for a resin material, the first resin material and the second resin material are welded by irradiating a welding laser beam from the first resin material side to a contact interface with the material. Before the step of irradiating the laser beam for contact with the contact interface between the first resin material and the second resin material, the contact interface between the first resin material and the second resin material is irradiated with the preheating laser light. A method for laser welding a resin material, characterized in that a spot diameter of the preheating laser beam is made larger than a spot diameter of the welding laser beam. 予備加熱用レーザー光のスポット径を溶着用レーザー光のスポット径の約２〜２０倍に設定したことを特徴とする請求項１に記載の樹脂材のレーザー溶着方法。   2. The laser welding method for a resin material according to claim 1, wherein the spot diameter of the preheating laser beam is set to about 2 to 20 times the spot diameter of the welding laser beam. 予備加熱用レーザー光を照射するための予備加熱用集光レンズを、溶着用レーザー光を照射するための溶着用集光レンズよりも前記第１樹脂材および前記第２樹脂材に近接させることにより、予備加熱用レーザー光のスポット径を溶着用レーザー光のスポット径より大きくしたことを特徴とする請求項１又は２に記載の樹脂材のレーザー溶着方法。   By bringing the preheating condensing lens for irradiating the preheating laser light closer to the first resin material and the second resin material than the welding condensing lens for irradiating the welding laser light The method for laser welding a resin material according to claim 1 or 2, wherein the spot diameter of the laser beam for preheating is larger than the spot diameter of the laser beam for welding. 予備加熱用レーザー光を照射するための予備加熱用集光レンズから前記第１樹脂材および前記第２樹脂材までの距離を変更することにより、予備加熱用レーザー光のスポット径を変更することを特徴とする請求項１〜３のいずれか一項に記載の樹脂材のレーザー溶着方法。   Changing the spot diameter of the preheating laser beam by changing the distance from the preheating condensing lens for irradiating the preheating laser beam to the first resin material and the second resin material. The laser welding method of the resin material as described in any one of Claims 1-3 characterized by the above-mentioned.
JP2006002086A 2006-01-10 2006-01-10 Laser welding method for resin material Pending JP2007182003A (en)

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CN117840614B (en) * 2024-03-07 2024-05-07 南京航空航天大学 Multi-wavelength laser modified welding device and method based on nano welding wire shallow cladding

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