WO2011074071A1 - Method of welding resin - Google Patents

Method of welding resin Download PDF

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Publication number
WO2011074071A1
WO2011074071A1 PCT/JP2009/070901 JP2009070901W WO2011074071A1 WO 2011074071 A1 WO2011074071 A1 WO 2011074071A1 JP 2009070901 W JP2009070901 W JP 2009070901W WO 2011074071 A1 WO2011074071 A1 WO 2011074071A1
Authority
WO
WIPO (PCT)
Prior art keywords
resin
resin member
welding
laser beam
laser light
Prior art date
Application number
PCT/JP2009/070901
Other languages
French (fr)
Japanese (ja)
Inventor
丈典 大宮
松本　聡
良雄 磯部
Original Assignee
浜松ホトニクス株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 浜松ホトニクス株式会社 filed Critical 浜松ホトニクス株式会社
Priority to PCT/JP2009/070901 priority Critical patent/WO2011074071A1/en
Publication of WO2011074071A1 publication Critical patent/WO2011074071A1/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
    • B29C65/1629—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
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/0006—Working by laser beam, e.g. welding, cutting or boring taking account of the properties of the material involved
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/035—Aligning the laser beam
    • B23K26/037—Aligning the laser beam by pressing on the workpiece, e.g. pressing roller foot
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • B23K26/24—Seam 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
    • 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
    • B29C65/02—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
    • B29C65/1632—Laser beams characterised by the way of heating the interface direct heating 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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    • B29C65/02—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
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    • 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
    • B29C65/02—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
    • B29C65/1638—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 focusing the laser beam on the interface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • 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
    • B29C65/1658—Laser beams characterised by the way of heating the interface scanning at least one of the parts to be joined scanning once, e.g. contour laser 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/003—Protecting areas of the parts to be joined from overheating
    • 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
    • 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
    • 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
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    • 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
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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
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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
    • B29C66/345—Progressively making the joint, e.g. starting from the middle
    • B29C66/3452—Making complete joints by combining partial 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
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    • 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
    • B29C66/434—Joining substantially flat articles for forming corner connections, fork connections or cross connections
    • B29C66/4342—Joining substantially flat articles for forming corner connections, e.g. for making V-shaped pieces
    • B29C66/43421—Joining substantially flat articles for forming corner connections, e.g. for making V-shaped pieces with a right angle, e.g. for making L-shaped pieces
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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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8122—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the composition of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/80—General aspects of machine operations or constructions and parts thereof
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    • B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8126—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/81261—Thermal properties, e.g. thermal conductivity, thermal expansion coefficient
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
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    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/818—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8181—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects
    • 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
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/95—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94
    • B29C66/959—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 characterised by specific values or ranges of said specific variables
    • B29C66/9592—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 characterised by specific values or ranges of said specific variables in explicit relation to another variable, e.g. X-Y diagrams

Definitions

  • the present invention relates to a resin welding method for manufacturing a resin welded body by welding resin members together.
  • the light absorption amount of the laser beam is the largest on the laser beam incident surface of the resin member, and the distance from the laser beam incident surface is small. As it increases (that is, as it goes into the resin member), the amount of absorbed laser light gradually decreases. For this reason, when the side surfaces (surfaces substantially parallel to the thickness direction) of the plate-like resin member that absorbs laser light are to be brought into contact with each other and welded, the laser light incident surface and the interior in the vicinity thereof are used. Damage (bubbles, cloudiness, burnout, etc.) due to excessive heat input may occur at the center of the irradiation region of the laser light in the region.
  • Patent Document 1 describes a method of irradiating a laser beam while supplying a coolant to a laser beam incident surface of a resin member.
  • an object of the present invention is to provide a resin welding method capable of reliably preventing the occurrence of damage due to excessive heat input in the planned welding region.
  • a resin welding method is a resin welding method for manufacturing a resin welded body by welding a first resin member and a second resin member, the first resin Irradiate a laser beam whose cross-sectional shape perpendicular to the optical axis is ring-shaped at the laser beam incident side end of the region to be welded so as to diverge in the region to be welded between the member and the second resin member, The irradiation position of the laser beam is relatively moved along the planned welding region, and the first resin member and the second resin member are melted in the planned welding region.
  • the cross-sectional shape of the laser beam perpendicular to the optical axis is a ring shape at the laser light incident side end of the region to be welded, the laser light incident side end of the region to be welded and the vicinity thereof It is possible to prevent damage due to excessive heat input at the center of the irradiation region of the laser beam.
  • the resin member since the laser beam diverges in the planned welding region, the resin member is prevented from being in an excessive heat input state, and the first resin member and the second resin member are disposed in the entire welding planned region. It can be melted moderately.
  • the laser beam is at least on the laser beam incident side of the welding planned area. It is preferable to irradiate the laser beam so as to straddle the first resin member and the second resin member at the end. There are many steps or gaps on the laser light incident side at the abutting part between the resin members, and these steps or gaps cause damage due to excessive heat input by scattering the laser light. Although it is easy, in this resin welding method, the ring-shaped laser beam straddles the first resin member and the second resin member at the laser beam incident side end of the planned welding region. The amount of light irradiation is reduced, and as a result, it is possible to suppress the occurrence of damage due to excessive heat input caused by steps or gaps.
  • the abutting portion when a plurality of layers to be welded are set along the abutting portion, it is preferable to irradiate the laser light in order from the welding planned region located on the laser beam emission side. In this case, the progress of the laser light is not hindered by the portion previously welded along the planned welding region on the laser light incident side, and the first resin member and the second resin member along each planned welding region. The resin member can be reliably melted.
  • a heat conductor that transmits laser light is disposed on the laser light incident side with respect to the first resin member and the second resin member, and the heat conductor is used as a heat sink to transmit laser light. Irradiation is preferably performed.
  • the heat conductor which is a heat sink, takes heat away from the laser beam incident side end of the resin member, so that excessive heat input is applied to the laser beam incident side end of the region to be welded and the center of the laser beam irradiation region in the vicinity thereof. It is possible to more reliably prevent the occurrence of damage due to.
  • FIG. 1 is a configuration diagram of a condensing optical system used in an embodiment of a resin welding method according to the present invention.
  • the condensing optical system 1 includes, in order from the light source LS side of the laser light L, a collimating lens 2, a condensing lens 3, and a conical convex axicon lens 4 on the optical axis OA. Arranged and configured.
  • the cross-sectional shape of the laser light L perpendicular to the optical axis OA becomes a solid circular shape on the light source LS side with respect to the condensing spot FS. It has an annular shape on the side opposite to the light source LS with respect to FS.
  • FIG. 2 is a graph showing the light intensity profile after the laser beam that has passed through the condensing optical system of FIG.
  • the light intensity profile of the laser light L has a light intensity profile at the center portion that is opposite to the light intensity profile of the laser light of the Gaussian distribution or the top hat distribution after reaching the condensing spot FS. It is lower than the light intensity of the part. 2 is a case where the light intensity of the laser light L is integrated in a direction orthogonal to the optical axis OA and the traveling direction of the laser light L.
  • FIGS. 3 and 4 A resin welding method using the condensing optical system 1 configured as described above will be described.
  • a 2 mm thick plate-like resin member (first resin member) 5 and resin member (second resin member) 6 made of glass fiber-containing nylon resin are prepared.
  • the side surface (surface substantially parallel to the thickness direction) 5a of the resin member 5 and the side surface (surface substantially parallel to the thickness direction) 6a of the resin member 6 are abutted.
  • the resin members 5 and 6 are sandwiched between the pressing plate (thermal conductor) 7 made of glass and the contact plate 8 made of a metal such as Al from both sides in the thickness direction of the resin members 5 and 6.
  • the welding planned region R is set along the abutting portion (here, the side surfaces 5a and 6a) between the members 5 and 6.
  • the resin members 5 and 6 are semi-absorbing with respect to the laser light L (absorbance 0.13). Further, the presser plate 7 is transmissive to the laser light L.
  • the extending direction of the optical axis OA substantially coincides with the thickness direction of the resin members 5 and 6, and the optical axis OA passes through the butted portion between the resin members 5 and 6.
  • the laser beam L is irradiated with the condensed spot FS aligned outside the interface between the resin members 5 and 6 and the presser plate 7 (on the presser plate 7 side).
  • the irradiation position of the laser light L is in a direction substantially perpendicular to the optical axis OA along the planned welding region R (arrow A in FIG. 3).
  • the resin members 5 and 6 are melted and re-solidified in the planned welding region R, and the resin members 5 and 6 are welded together to produce a resin welded body.
  • the laser beam L when the laser beam L is irradiated, the laser beam L diverges in the planned welding region R.
  • the cross-sectional shape of the laser beam L perpendicular to the optical axis OA is an annular shape in the planned welding region R, and the laser beam L straddles the resin member 5 and the resin member 6 in the planned welding region R. (In other words, it is stretched between the resin member 5 and the resin member 6).
  • the laser beam L has an energy density capable of melting the resin members 5 and 6 in the welding planned region R having substantially the same height as the thickness of the resin members 5 and 6.
  • the cross-sectional shape of the laser beam L perpendicular to the optical axis OA is the laser beam in the planned welding region R. Since the incident side end R1 has an annular shape, damage (bubbles, white turbidity, burnout, etc.) due to excessive heat input to the laser light incident side end R1 of the planned welding region R and the center of the irradiation region of the laser light L in the vicinity thereof ) Can be prevented. In addition, since the laser beam L diverges in the planned welding region R, it is possible to suppress the resin members 5 and 6 from being in a state of excessive heat input, so that the resin members 5 and 6 are covered in the entire welding planned region R. It can be melted moderately.
  • FIG. 6 is an enlarged cross-sectional view of a butt portion between resin members. As shown in FIG. 6, due to the molding accuracy of the resin members 5 and 6 being not so high, a step or a gap or the like is generated on the laser light incident side at the butt portion between the resin members 5 and 6.
  • the resin welding method of irradiating the laser beam L so that the laser beam L straddles the resin member 5 and the resin member 6 at the laser beam incident side end R1 of the planned welding region R is the resin members 5 and 6 are bonded together. This is particularly effective when the welding planned region R is set along the butted portion.
  • this resin welding method performs processing with the laser beam after reaching the condensing spot FS, it is necessary to increase the working distance (for example, the distance between the condensing optical system 1 and the resin members 5 and 6). It is valid.
  • the presser plate 7 disposed on the laser beam incident side with respect to the resin members 5 and 6 functions as a heat sink, and heat is applied from the end portions of the resin members 5 and 6 on the laser beam incident side. Robbed. Therefore, the occurrence of damage due to excessive heat input is more reliably prevented at the laser light incident side end R1 of the planned welding region R and the central portion of the irradiation region of the laser light L in the vicinity thereof.
  • the present invention is not limited to the embodiment described above.
  • the thickness of the resin members 5, 6 is greater than the height of the region to be welded R (in other words, the energy density range in which the laser light L can melt the resin members 5, 6).
  • a plurality of layers to be welded R may be set along the abutting portions (here, the side surfaces 5a and 6a) between the resin members 5 and 6.
  • the progress of the laser beam L is not hindered by the previously welded portion along the planned welding region R on the laser beam incident side, and the resin members 5 and 6 are reliably melted along each planned welding region R. It is because it can be made.
  • the surface of the plate-like resin member 5 (surface substantially perpendicular to the thickness direction) 5 b and the side surface 6 a of the plate-like resin member 6 are substantially aligned.
  • the side surface 5a of the member 5 and the surface (surface substantially perpendicular to the thickness direction) 6b of the resin member 6 may be abutted, and the planned welding region R may be set along the abutting portion.
  • the extending direction of the optical axis OA substantially coincides with the thickness direction of the resin member 5, and the optical axis OA passes through the butted portion between the resin members 5 and 6.
  • the resin member 5, 6 is melted in the welding planned region R by irradiating the laser beam L with the focused spot FS on the outer side (presser plate 7 side) of the interface with the presser plate 7. 5 and 6 are welded together to produce a resin welded body.
  • the resin members 5 and 6 are overlapped so that the surface 5b of the plate-like resin member 5 and the surface 6b of the plate-like resin member 6 are in contact with each other, and the overlap portion
  • the welding planned region R may be set along
  • the molding accuracy of the resin members 5 and 6 is not so high, there may be a gap between the surface 5b of the resin member 5 and the surface 6b of the resin member 6 due to warpage or the like.
  • the resin members 5 and 6 melt in the planned welding region R straddling the resin member 5 and the resin member 6, and the melted resin fills the gap, so that the resin members 5 and 6 are reliably connected to each other. Can be welded.
  • the energy density of the laser beam L decreases due to divergence as the laser beam L progresses, and therefore the melting point of the resin member 6 is lower than the melting point of the resin member 5. Also, the resin members 5 and 6 can be melted substantially simultaneously.
  • the cross-sectional shape of the laser beam L perpendicular to the optical axis OA is at least a ring shape at the laser beam incident side end R1 of the planned welding region R, the laser beam incident side end R1 of the planned welding region R and It is possible to prevent damage due to excessive heat input at the center of the irradiation region of the laser light L in the vicinity thereof. Furthermore, if the laser beam L straddles the resin member 5 and the resin member 6 at least at the laser beam incident side end R1 of the welding planned region R, heat input caused by a step or a gap between the resin members 5 and 6 or the like. The occurrence of damage due to excess can be suppressed.
  • the laser beam incident side end R1 of the planned welding region R is the surface of the resin members 5 and 6 serving as an interface with the holding plate 7 in the examples of FIGS. 5, 7, and 8, and the resin member 5 in the example of FIG. This is the laser light incident side surface.

Abstract

Laser light (L) has a cross-sectional shape perpendicular to the optical axis (OA), the cross-sectional shape being annular at the laser light incidence-side end (R1) of a region (R) to be welded. At the laser light incidence-side end (R1) of the region (R) to be welded and in the vicinity of the end (R1), the center of a region irradiated with the laser light (L) can hence be prevented from suffering damage caused by overheating (bubbles, turbidity, burning, etc.). Furthermore, since the laser light (L) is divergent in the region (R) to be welded, the resinous members (5, 6) can be inhibited from being overheated and the resinous members (5, 6) can be moderately melted throughout the region (R) to be welded.

Description

樹脂溶着方法Resin welding method
　本発明は、樹脂部材同士を溶着して樹脂溶着体を製造する樹脂溶着方法に関する。 The present invention relates to a resin welding method for manufacturing a resin welded body by welding resin members together.
　上記技術分野における従来の樹脂溶着方法として、一方の樹脂部材と他方の樹脂部材との溶着予定領域に沿ってレーザ光を照射して、溶着予定領域において一方の樹脂部材及び他方の樹脂部材を溶融させることにより、樹脂部材同士を溶着する方法が知られている。 As a conventional resin welding method in the above technical field, laser light is irradiated along the planned welding region between one resin member and the other resin member, and the one resin member and the other resin member are melted in the planned welding region. By doing so, a method for welding resin members together is known.
　ところで、レーザ光に対して吸収性を有する樹脂部材においては、図１０に示されるように、樹脂部材のレーザ光入射面でレーザ光の吸収光量が最も多くなり、レーザ光入射面からの距離が大きくなるに従って（すなわち、樹脂部材の内部に行くに従って）レーザ光の吸収光量が徐々に少なくなる。そのため、レーザ光に対して吸収性を有する板状の樹脂部材の側面（厚さ方向に対して略平行な面）同士を突き合わせて溶着する場合などには、レーザ光入射面及びその近傍の内部領域におけるレーザ光の照射領域中心部に入熱過多による損傷（気泡、白濁、焼損等）が生じることがある。 By the way, in the resin member which has absorptivity with respect to a laser beam, as shown in FIG. 10, the light absorption amount of the laser beam is the largest on the laser beam incident surface of the resin member, and the distance from the laser beam incident surface is small. As it increases (that is, as it goes into the resin member), the amount of absorbed laser light gradually decreases. For this reason, when the side surfaces (surfaces substantially parallel to the thickness direction) of the plate-like resin member that absorbs laser light are to be brought into contact with each other and welded, the laser light incident surface and the interior in the vicinity thereof are used. Damage (bubbles, cloudiness, burnout, etc.) due to excessive heat input may occur at the center of the irradiation region of the laser light in the region.
　そのような損傷を防止するための樹脂溶着方法として、特許文献１には、樹脂部材のレーザ光入射面に冷媒を供給しつつレーザ光の照射を行う方法が記載されている。 As a resin welding method for preventing such damage, Patent Document 1 describes a method of irradiating a laser beam while supplying a coolant to a laser beam incident surface of a resin member.
特開２００５－８８３５５号公報JP 2005-88355 A
　しかしながら、特許文献１記載の樹脂溶着方法にあっては、樹脂部材のレーザ光入射面における損傷の発生は防止し得るものの、レーザ光入射面近傍の内部領域における損傷の発生までを防止することは困難である。 However, in the resin welding method described in Patent Document 1, although the occurrence of damage on the laser light incident surface of the resin member can be prevented, it is possible to prevent the occurrence of damage in the internal region near the laser light incident surface. Have difficulty.
　そこで、本発明は、このような事情に鑑みてなされたものであり、溶着予定領域において入熱過多による損傷の発生を確実に防止することができる樹脂溶着方法を提供することを目的とする。 Therefore, the present invention has been made in view of such circumstances, and an object of the present invention is to provide a resin welding method capable of reliably preventing the occurrence of damage due to excessive heat input in the planned welding region.
　上記目的を達成するために、本発明に係る樹脂溶着方法は、第１の樹脂部材と第２の樹脂部材とを溶着して樹脂溶着体を製造する樹脂溶着方法であって、第１の樹脂部材と第２の樹脂部材との溶着予定領域において発散するように、光軸に対して垂直な断面形状が少なくとも溶着予定領域のレーザ光入射側端部において環形状であるレーザ光を照射し、レーザ光の照射位置を溶着予定領域に沿って相対的に移動させて、溶着予定領域において第１の樹脂部材及び第２の樹脂部材を溶融させることを特徴とする。 In order to achieve the above object, a resin welding method according to the present invention is a resin welding method for manufacturing a resin welded body by welding a first resin member and a second resin member, the first resin Irradiate a laser beam whose cross-sectional shape perpendicular to the optical axis is ring-shaped at the laser beam incident side end of the region to be welded so as to diverge in the region to be welded between the member and the second resin member, The irradiation position of the laser beam is relatively moved along the planned welding region, and the first resin member and the second resin member are melted in the planned welding region.
　この樹脂溶着方法では、光軸に対して垂直なレーザ光の断面形状が溶着予定領域のレーザ光入射側端部において環形状であるため、溶着予定領域のレーザ光入射側端部及びその近傍におけるレーザ光の照射領域中心部に入熱過多による損傷が生じるのを防止することができる。しかも、レーザ光が溶着予定領域において発散しているため、樹脂部材が入熱過多の状態になるのを抑制して、溶着予定領域の全領域で第１の樹脂部材及び第２の樹脂部材を適度に溶融させることができる。 In this resin welding method, since the cross-sectional shape of the laser beam perpendicular to the optical axis is a ring shape at the laser light incident side end of the region to be welded, the laser light incident side end of the region to be welded and the vicinity thereof It is possible to prevent damage due to excessive heat input at the center of the irradiation region of the laser beam. In addition, since the laser beam diverges in the planned welding region, the resin member is prevented from being in an excessive heat input state, and the first resin member and the second resin member are disposed in the entire welding planned region. It can be melted moderately.
　本発明に係る樹脂溶着方法においては、第１の樹脂部材と第２の樹脂部材との突合せ部に沿って溶着予定領域を設定した場合には、レーザ光が少なくとも溶着予定領域のレーザ光入射側端部において第１の樹脂部材と第２の樹脂部材とを跨ぐようにレーザ光の照射を行うことが好ましい。樹脂部材同士の突合せ部にはレーザ光入射側に段差や隙間等が生じていることが多く、これらの段差や隙間等がレーザ光を散乱させるなどして入熱過多による損傷を生じさせる原因となり易いものの、この樹脂溶着方法では、溶着予定領域のレーザ光入射側端部において環形状のレーザ光が第１の樹脂部材と第２の樹脂部材とに跨っているため、段差や隙間等に対するレーザ光の照射量が少なくなり、その結果、段差や隙間等に起因した入熱過多による損傷の発生を抑制することができる。 In the resin welding method according to the present invention, when the welding planned area is set along the abutting portion between the first resin member and the second resin member, the laser beam is at least on the laser beam incident side of the welding planned area. It is preferable to irradiate the laser beam so as to straddle the first resin member and the second resin member at the end. There are many steps or gaps on the laser light incident side at the abutting part between the resin members, and these steps or gaps cause damage due to excessive heat input by scattering the laser light. Although it is easy, in this resin welding method, the ring-shaped laser beam straddles the first resin member and the second resin member at the laser beam incident side end of the planned welding region. The amount of light irradiation is reduced, and as a result, it is possible to suppress the occurrence of damage due to excessive heat input caused by steps or gaps.
　そして、突合せ部に沿って溶着予定領域を複数層設定した場合には、レーザ光出射側に位置する溶着予定領域から順にレーザ光の照射を行うことが好ましい。この場合、レーザ光入射側の溶着予定領域に沿って先に溶着された部分によってレーザ光の進行が妨げられるようなことがなく、各溶着予定領域に沿って第１の樹脂部材及び第２の樹脂部材を確実に溶融させることができる。 Further, when a plurality of layers to be welded are set along the abutting portion, it is preferable to irradiate the laser light in order from the welding planned region located on the laser beam emission side. In this case, the progress of the laser light is not hindered by the portion previously welded along the planned welding region on the laser light incident side, and the first resin member and the second resin member along each planned welding region. The resin member can be reliably melted.
　本発明に係る樹脂溶着方法においては、レーザ光を透過する熱伝導体を第１の樹脂部材及び第２の樹脂部材に対してレーザ光入射側に配置し、熱伝導体をヒートシンクとしてレーザ光の照射を行うことが好ましい。この場合、ヒートシンクである熱伝導体が樹脂部材のレーザ光入射側端部から熱を奪うため、溶着予定領域のレーザ光入射側端部及びその近傍におけるレーザ光の照射領域中心部に入熱過多による損傷が生じるのをより確実に防止することができる。 In the resin welding method according to the present invention, a heat conductor that transmits laser light is disposed on the laser light incident side with respect to the first resin member and the second resin member, and the heat conductor is used as a heat sink to transmit laser light. Irradiation is preferably performed. In this case, the heat conductor, which is a heat sink, takes heat away from the laser beam incident side end of the resin member, so that excessive heat input is applied to the laser beam incident side end of the region to be welded and the center of the laser beam irradiation region in the vicinity thereof. It is possible to more reliably prevent the occurrence of damage due to.
　本発明によれば、溶着予定領域において入熱過多による損傷の発生を確実に防止することができる。 According to the present invention, it is possible to reliably prevent the occurrence of damage due to excessive heat input in the planned welding region.
本発明に係る樹脂溶着方法の一実施形態に用いられる集光光学系の構成図である。It is a block diagram of the condensing optical system used for one Embodiment of the resin welding method which concerns on this invention. 図１の集光光学系を通過したレーザ光の集光スポット到達後の光強度プロファイルを示すグラフである。It is a graph which shows the light intensity profile after the condensing spot of the laser beam which passed the condensing optical system of FIG. 本発明に係る樹脂溶着方法の一実施形態を説明するための平面図である。It is a top view for demonstrating one Embodiment of the resin welding method which concerns on this invention. 本発明に係る樹脂溶着方法の一実施形態を説明するための断面図である。It is sectional drawing for demonstrating one Embodiment of the resin welding method which concerns on this invention. 本発明に係る樹脂溶着方法の一実施形態を説明するための断面図である。It is sectional drawing for demonstrating one Embodiment of the resin welding method which concerns on this invention. 樹脂部材同士の突合せ部の拡大断面図である。It is an expanded sectional view of the butting part of resin members. 本発明に係る樹脂溶着方法の他の実施形態を説明するための断面図である。It is sectional drawing for demonstrating other embodiment of the resin welding method which concerns on this invention. 本発明に係る樹脂溶着方法の他の実施形態を説明するための断面図である。It is sectional drawing for demonstrating other embodiment of the resin welding method which concerns on this invention. 本発明に係る樹脂溶着方法の他の実施形態を説明するための断面図である。It is sectional drawing for demonstrating other embodiment of the resin welding method which concerns on this invention. 樹脂部材のレーザ光入射面からの距離とレーザ光の吸収光量との関係を示すグラフである。It is a graph which shows the relationship between the distance from the laser beam incident surface of a resin member, and the absorbed light quantity of a laser beam.
　以下、本発明の好適な実施形態について、図面を参照して詳細に説明する。なお、各図において同一又は相当部分には同一符号を付し、重複する説明を省略する。 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the same or an equivalent part, and the overlapping description is abbreviate | omitted.
　図１は、本発明に係る樹脂溶着方法の一実施形態に用いられる集光光学系の構成図である。図１に示されるように、集光光学系１は、レーザ光Ｌの光源ＬＳ側から順に、コリメート用レンズ２、集光用レンズ３及び円錐凸状のアキシコンレンズ４が光軸ＯＡ上に配置されて構成されている。この集光光学系１をレーザ光Ｌが通過すると、光軸ＯＡに対して垂直なレーザ光Ｌの断面形状は、集光スポットＦＳに対して光源ＬＳ側で中実円形状となり、集光スポットＦＳに対して光源ＬＳと反対側で円環形状となる。 FIG. 1 is a configuration diagram of a condensing optical system used in an embodiment of a resin welding method according to the present invention. As shown in FIG. 1, the condensing optical system 1 includes, in order from the light source LS side of the laser light L, a collimating lens 2, a condensing lens 3, and a conical convex axicon lens 4 on the optical axis OA. Arranged and configured. When the laser light L passes through the condensing optical system 1, the cross-sectional shape of the laser light L perpendicular to the optical axis OA becomes a solid circular shape on the light source LS side with respect to the condensing spot FS. It has an annular shape on the side opposite to the light source LS with respect to FS.
　図２は、図１の集光光学系を通過したレーザ光の集光スポット到達後の光強度プロファイルを示すグラフである。図２に示されるように、レーザ光Ｌの光強度プロファイルは、集光スポットＦＳ到達後において、ガウシアン分布やトップハット分布のレーザ光の光強度プロファイルとは逆に、中央部の光強度が周囲部の光強度よりも低いものとなっている。なお、図２の光強度プロファイルは、光軸ＯＡ及びレーザ光Ｌの進行方向と直交する方向にレーザ光Ｌの光強度を積分した場合である。 FIG. 2 is a graph showing the light intensity profile after the laser beam that has passed through the condensing optical system of FIG. As shown in FIG. 2, the light intensity profile of the laser light L has a light intensity profile at the center portion that is opposite to the light intensity profile of the laser light of the Gaussian distribution or the top hat distribution after reaching the condensing spot FS. It is lower than the light intensity of the part. 2 is a case where the light intensity of the laser light L is integrated in a direction orthogonal to the optical axis OA and the traveling direction of the laser light L.
　以上のように構成された集光光学系１を用いた樹脂溶着方法について説明する。まず、図３，４に示されるように、ガラス繊維入りナイロン樹脂からなる厚さ２ｍｍの板状の樹脂部材（第１の樹脂部材）５及び樹脂部材（第２の樹脂部材）６を準備し、樹脂部材５の側面（厚さ方向に対して略平行な面）５ａと樹脂部材６の側面（厚さ方向に対して略平行な面）６ａとを突き合わせる。この状態で、樹脂部材５，６の厚さ方向における両側から、ガラスからなる押え板（熱伝導体）７とＡｌ等の金属からなる当て板８とで樹脂部材５，６を挟持し、樹脂部材５，６同士の突合せ部（ここでは、側面５ａ，６ａ）に沿って溶着予定領域Ｒを設定する。なお、樹脂部材５，６は、レーザ光Ｌに対して半吸収性を有している（吸光度０．１３）。また、押え板７は、レーザ光Ｌに対して透過性を有している。 A resin welding method using the condensing optical system 1 configured as described above will be described. First, as shown in FIGS. 3 and 4, a 2 mm thick plate-like resin member (first resin member) 5 and resin member (second resin member) 6 made of glass fiber-containing nylon resin are prepared. The side surface (surface substantially parallel to the thickness direction) 5a of the resin member 5 and the side surface (surface substantially parallel to the thickness direction) 6a of the resin member 6 are abutted. In this state, the resin members 5 and 6 are sandwiched between the pressing plate (thermal conductor) 7 made of glass and the contact plate 8 made of a metal such as Al from both sides in the thickness direction of the resin members 5 and 6. The welding planned region R is set along the abutting portion (here, the side surfaces 5a and 6a) between the members 5 and 6. The resin members 5 and 6 are semi-absorbing with respect to the laser light L (absorbance 0.13). Further, the presser plate 7 is transmissive to the laser light L.
　続いて、図５に示されるように、光軸ＯＡの延在方向が樹脂部材５，６の厚さ方向と略一致し、且つ光軸ＯＡが樹脂部材５，６同士の突合せ部を通る状態で、樹脂部材５，６と押え板７との界面よりも外側（押え板７側）に集光スポットＦＳを合わせてレーザ光Ｌを照射する。そして、集光光学系１及び樹脂部材５，６の少なくとも一方を動作させることにより、レーザ光Ｌの照射位置を溶着予定領域Ｒに沿って光軸ＯＡと略直交する方向（図３における矢印Ａ方向）に相対的に移動させる。これにより、溶着予定領域Ｒにおいて樹脂部材５，６が溶融・再固化し、樹脂部材５，６同士が溶着されて樹脂溶着体が製造される。 Subsequently, as shown in FIG. 5, the extending direction of the optical axis OA substantially coincides with the thickness direction of the resin members 5 and 6, and the optical axis OA passes through the butted portion between the resin members 5 and 6. Then, the laser beam L is irradiated with the condensed spot FS aligned outside the interface between the resin members 5 and 6 and the presser plate 7 (on the presser plate 7 side). Then, by operating at least one of the condensing optical system 1 and the resin members 5 and 6, the irradiation position of the laser light L is in a direction substantially perpendicular to the optical axis OA along the planned welding region R (arrow A in FIG. 3). Direction). Thus, the resin members 5 and 6 are melted and re-solidified in the planned welding region R, and the resin members 5 and 6 are welded together to produce a resin welded body.
　ここで、レーザ光Ｌの照射に際しては、レーザ光Ｌは、溶着予定領域Ｒにおいて発散している。そして、光軸ＯＡに対して垂直なレーザ光Ｌの断面形状は、溶着予定領域Ｒにおいて円環形状であり、レーザ光Ｌは、溶着予定領域Ｒにおいて樹脂部材５と樹脂部材６とを跨いでいる（換言すれば、樹脂部材５と樹脂部材６とに掛け渡されている）。なお、レーザ光Ｌは、樹脂部材５，６の厚さと略同一高さの溶着予定領域Ｒにおいて樹脂部材５，６を溶融させ得るエネルギ密度を有している。 Here, when the laser beam L is irradiated, the laser beam L diverges in the planned welding region R. The cross-sectional shape of the laser beam L perpendicular to the optical axis OA is an annular shape in the planned welding region R, and the laser beam L straddles the resin member 5 and the resin member 6 in the planned welding region R. (In other words, it is stretched between the resin member 5 and the resin member 6). The laser beam L has an energy density capable of melting the resin members 5 and 6 in the welding planned region R having substantially the same height as the thickness of the resin members 5 and 6.
　以上説明したように、集光光学系１を用いた樹脂溶着方法においては、図５に示されるように、光軸ＯＡに対して垂直なレーザ光Ｌの断面形状が溶着予定領域Ｒのレーザ光入射側端部Ｒ１において円環形状であるため、溶着予定領域Ｒのレーザ光入射側端部Ｒ１及びその近傍におけるレーザ光Ｌの照射領域中心部に入熱過多による損傷（気泡、白濁、焼損等）が生じるのを防止することができる。しかも、レーザ光Ｌが溶着予定領域Ｒにおいて発散しているため、樹脂部材５，６が入熱過多の状態になるのを抑制して、溶着予定領域Ｒの全領域で樹脂部材５，６を適度に溶融させることができる。 As described above, in the resin welding method using the condensing optical system 1, as shown in FIG. 5, the cross-sectional shape of the laser beam L perpendicular to the optical axis OA is the laser beam in the planned welding region R. Since the incident side end R1 has an annular shape, damage (bubbles, white turbidity, burnout, etc.) due to excessive heat input to the laser light incident side end R1 of the planned welding region R and the center of the irradiation region of the laser light L in the vicinity thereof ) Can be prevented. In addition, since the laser beam L diverges in the planned welding region R, it is possible to suppress the resin members 5 and 6 from being in a state of excessive heat input, so that the resin members 5 and 6 are covered in the entire welding planned region R. It can be melted moderately.
　また、溶着予定領域Ｒのレーザ光入射側端部Ｒ１において円環形状のレーザ光Ｌが樹脂部材５と樹脂部材６とに跨っているため、樹脂部材５，６間の段差や隙間等に対するレーザ光Ｌの照射量が少なくなり、その結果、樹脂部材５，６間の段差や隙間等に起因した入熱過多による損傷の発生を抑制することができる。図６は、樹脂部材同士の突合せ部の拡大断面図である。図６に示されるように、樹脂部材５，６の成形精度がそれ程高くないことに起因して、樹脂部材５，６同士の突合せ部にはレーザ光入射側に段差や隙間等が生じていることが多く、これらの段差や隙間等がレーザ光Ｌを散乱させるなどして入熱過多による損傷を生じさせる原因となり易い。従って、レーザ光Ｌが溶着予定領域Ｒのレーザ光入射側端部Ｒ１において樹脂部材５と樹脂部材６とを跨ぐようにレーザ光Ｌの照射を行う
樹脂溶着方法は、樹脂部材５，６同士を突き合わせその突合せ部に沿って溶着予定領域Ｒを設定した場合に特に有効である。 Further, since the annular laser beam L straddles the resin member 5 and the resin member 6 at the laser beam incident side end R1 of the planned welding region R, a laser for a step or a gap between the resin members 5 and 6 and the like. The amount of irradiation with the light L is reduced, and as a result, it is possible to suppress the occurrence of damage due to excessive heat input caused by steps or gaps between the resin members 5 and 6. FIG. 6 is an enlarged cross-sectional view of a butt portion between resin members. As shown in FIG. 6, due to the molding accuracy of the resin members 5 and 6 being not so high, a step or a gap or the like is generated on the laser light incident side at the butt portion between the resin members 5 and 6. In many cases, these steps, gaps, and the like are likely to cause damage due to excessive heat input by scattering the laser beam L or the like. Therefore, the resin welding method of irradiating the laser beam L so that the laser beam L straddles the resin member 5 and the resin member 6 at the laser beam incident side end R1 of the planned welding region R is the resin members 5 and 6 are bonded together. This is particularly effective when the welding planned region R is set along the butted portion.
　更に、この樹脂溶着方法は、集光スポットＦＳ到達後のレーザ光で加工を行うため、ワーキングディスタンス（例えば、集光光学系１と樹脂部材５，６との距離）をかせぐ必要がある場合に有効である。 Furthermore, since this resin welding method performs processing with the laser beam after reaching the condensing spot FS, it is necessary to increase the working distance (for example, the distance between the condensing optical system 1 and the resin members 5 and 6). It is valid.
　なお、レーザ光Ｌの照射に際しては、樹脂部材５，６に対してレーザ光入射側に配置された押え板７がヒートシンクとして機能し、樹脂部材５，６のレーザ光入射側端部から熱を奪っている。そのため、溶着予定領域Ｒのレーザ光入射側端部Ｒ１及びその近傍におけるレーザ光Ｌの照射領域中心部で、入熱過多による損傷の発生がより確実に防止されている。 When irradiating the laser beam L, the presser plate 7 disposed on the laser beam incident side with respect to the resin members 5 and 6 functions as a heat sink, and heat is applied from the end portions of the resin members 5 and 6 on the laser beam incident side. Robbed. Therefore, the occurrence of damage due to excessive heat input is more reliably prevented at the laser light incident side end R1 of the planned welding region R and the central portion of the irradiation region of the laser light L in the vicinity thereof.
　本発明は、上述した実施形態に限定されるものではない。 The present invention is not limited to the embodiment described above.
　例えば、図７に示されるように、樹脂部材５，６の厚さが溶着予定領域Ｒ（換言すれば、レーザ光Ｌが樹脂部材５，６を溶融させ得るエネルギ密度の範囲）の高さよりも大きい場合には、樹脂部材５，６同士の突合せ部（ここでは、側面５ａ，６ａ）に沿って溶着予定領域Ｒを複数層設定してもよい。そして、この場合には、レーザ光出射側に位置する溶着予定領域Ｒから順にレーザ光Ｌの照射を行うことが好ましい。レーザ光入射側の溶着予定領域Ｒに沿って先に溶着された部分によってレーザ光Ｌの進行が妨げられるようなことがなく、各溶着予定領域Ｒに沿って樹脂部材５，６を確実に溶融させることができるからである。 For example, as shown in FIG. 7, the thickness of the resin members 5, 6 is greater than the height of the region to be welded R (in other words, the energy density range in which the laser light L can melt the resin members 5, 6). In the case of being large, a plurality of layers to be welded R may be set along the abutting portions (here, the side surfaces 5a and 6a) between the resin members 5 and 6. In this case, it is preferable to irradiate the laser beam L in order from the planned welding region R located on the laser beam emission side. The progress of the laser beam L is not hindered by the previously welded portion along the planned welding region R on the laser beam incident side, and the resin members 5 and 6 are reliably melted along each planned welding region R. It is because it can be made.
　また、図８に示されるように、板状の樹脂部材５の表面（厚さ方向に対して略垂直な面）５ｂと板状の樹脂部材６の側面６ａとが略一致するように、樹脂部材５の側面５ａと樹脂部材６の表面（厚さ方向に対して略垂直な面）６ｂとを突き合わせて、その突合せ部に沿って溶着予定領域Ｒを設定してもよい。一例として、この場合には、光軸ＯＡの延在方向が樹脂部材５の厚さ方向と略一致し、且つ光軸ＯＡが樹脂部材５，６同士の突合せ部を通る状態で、樹脂部材５と押え板７との界面よりも外側（押え板７側）に集光スポットＦＳを合わせてレーザ光Ｌを照射して、溶着予定領域Ｒにおいて樹脂部材５，６を溶融させることにより、樹脂部材５，６同士を溶着して樹脂溶着体を製造する。 Further, as shown in FIG. 8, the surface of the plate-like resin member 5 (surface substantially perpendicular to the thickness direction) 5 b and the side surface 6 a of the plate-like resin member 6 are substantially aligned. The side surface 5a of the member 5 and the surface (surface substantially perpendicular to the thickness direction) 6b of the resin member 6 may be abutted, and the planned welding region R may be set along the abutting portion. As an example, in this case, the extending direction of the optical axis OA substantially coincides with the thickness direction of the resin member 5, and the optical axis OA passes through the butted portion between the resin members 5 and 6. The resin member 5, 6 is melted in the welding planned region R by irradiating the laser beam L with the focused spot FS on the outer side (presser plate 7 side) of the interface with the presser plate 7. 5 and 6 are welded together to produce a resin welded body.
　また、図９に示されるように、板状の樹脂部材５の表面５ｂと板状の樹脂部材６の表面６ｂとが接触するように樹脂部材５，６同士を重ね合わせて、その重ね合せ部に沿って溶着予定領域Ｒを設定してもよい。このとき、樹脂部材５，６の成形精度がそれ程高くないことに起因して、反り等によって樹脂部材５の表面５ｂと樹脂部材６の表面６ｂとの間に隙間が生じる場合があるものの、そのような場合であっても、樹脂部材５と樹脂部材６とに跨る溶着予定領域Ｒにおいて樹脂部材５，６が溶融し、溶融した樹脂が隙間を埋めるため、樹脂部材５，６同士を確実に溶着することができる。なお、溶着予定領域Ｒにおいては、レーザ光Ｌの進行と伴に発散によってレーザ光Ｌのエネルギ密度が低下するため、樹脂部材５の融点よりも樹脂部材６の融点が低いような場合であっても、樹脂部材５，６を略同時に溶融させることができる。 Further, as shown in FIG. 9, the resin members 5 and 6 are overlapped so that the surface 5b of the plate-like resin member 5 and the surface 6b of the plate-like resin member 6 are in contact with each other, and the overlap portion The welding planned region R may be set along At this time, although the molding accuracy of the resin members 5 and 6 is not so high, there may be a gap between the surface 5b of the resin member 5 and the surface 6b of the resin member 6 due to warpage or the like. Even in such a case, the resin members 5 and 6 melt in the planned welding region R straddling the resin member 5 and the resin member 6, and the melted resin fills the gap, so that the resin members 5 and 6 are reliably connected to each other. Can be welded. Note that, in the welding planned region R, the energy density of the laser beam L decreases due to divergence as the laser beam L progresses, and therefore the melting point of the resin member 6 is lower than the melting point of the resin member 5. Also, the resin members 5 and 6 can be melted substantially simultaneously.
　また、光軸ＯＡに対して垂直なレーザ光Ｌの断面形状が少なくとも溶着予定領域Ｒのレーザ光入射側端部Ｒ１において環形状であれば、溶着予定領域Ｒのレーザ光入射側端部Ｒ１及びその近傍におけるレーザ光Ｌの照射領域中心部に入熱過多による損傷が生じるのを防止することができる。更に、レーザ光Ｌが少なくとも溶着予定領域Ｒのレーザ光入射側端部Ｒ１において樹脂部材５と樹脂部材６とを跨いでいれば、樹脂部材５，６間の段差や隙間等に起因した入熱過多による損傷の発生を抑制することができる。 If the cross-sectional shape of the laser beam L perpendicular to the optical axis OA is at least a ring shape at the laser beam incident side end R1 of the planned welding region R, the laser beam incident side end R1 of the planned welding region R and It is possible to prevent damage due to excessive heat input at the center of the irradiation region of the laser light L in the vicinity thereof. Furthermore, if the laser beam L straddles the resin member 5 and the resin member 6 at least at the laser beam incident side end R1 of the welding planned region R, heat input caused by a step or a gap between the resin members 5 and 6 or the like. The occurrence of damage due to excess can be suppressed.
　なお、溶着予定領域Ｒのレーザ光入射側端部Ｒ１は、図５，７，８の例では押え板７との界面となる樹脂部材５，６の表面となり、図９の例では樹脂部材５のレーザ光入射側表面となる。 Note that the laser beam incident side end R1 of the planned welding region R is the surface of the resin members 5 and 6 serving as an interface with the holding plate 7 in the examples of FIGS. 5, 7, and 8, and the resin member 5 in the example of FIG. This is the laser light incident side surface.
　溶着予定領域において入熱過多による損傷の発生を確実に防止することができる。 ∙ It is possible to reliably prevent the occurrence of damage due to excessive heat input in the planned welding area.
　５…樹脂部材（第１の樹脂部材）、６…樹脂部材（第２の樹脂部材）、７…押え板（熱伝導体）、Ｌ…レーザ光、ＯＡ…光軸、Ｒ…溶着予定領域。 5 ... resin member (first resin member), 6 ... resin member (second resin member), 7 ... presser plate (thermal conductor), L ... laser beam, OA ... optical axis, R ... planned welding region.

Claims (4)

  1. 　第１の樹脂部材と第２の樹脂部材とを溶着して樹脂溶着体を製造する樹脂溶着方法であって、
    　前記第１の樹脂部材と前記第２の樹脂部材との溶着予定領域において発散するように、光軸に対して垂直な断面形状が少なくとも前記溶着予定領域のレーザ光入射側端部において環形状であるレーザ光を照射し、前記レーザ光の照射位置を前記溶着予定領域に沿って相対的に移動させて、前記溶着予定領域において前記第１の樹脂部材及び前記第２の樹脂部材を溶融させることを特徴とする樹脂溶着方法。     A resin welding method for manufacturing a resin welded body by welding a first resin member and a second resin member,
    The cross-sectional shape perpendicular to the optical axis is an annular shape at least at the laser light incident side end of the planned welding region so as to diverge in the planned welding region between the first resin member and the second resin member. Irradiating a certain laser beam, relatively moving the irradiation position of the laser beam along the planned welding region, and melting the first resin member and the second resin member in the planned welding region The resin welding method characterized by this.
  2. 　前記第１の樹脂部材と前記第２の樹脂部材との突合せ部に沿って前記溶着予定領域を設定した場合には、前記レーザ光が少なくとも前記溶着予定領域のレーザ光入射側端部において前記第１の樹脂部材と前記第２の樹脂部材とを跨ぐように前記レーザ光の照射を行うことを特徴とする請求項１記載の樹脂溶着方法。 When the welding planned area is set along the abutting portion between the first resin member and the second resin member, the laser beam is at least at the laser beam incident side end of the welding planned area. The resin welding method according to claim 1, wherein the laser light irradiation is performed so as to straddle the first resin member and the second resin member.
  3. 　前記突合せ部に沿って前記溶着予定領域を複数層設定した場合には、レーザ光出射側に位置する前記溶着予定領域から順に前記レーザ光の照射を行うことを特徴とする請求項２記載の樹脂溶着方法。 3. The resin according to claim 2, wherein when a plurality of layers of the planned welding area are set along the butted portion, the laser light irradiation is performed in order from the planned welding area located on the laser beam emission side. Welding method.
  4. 　前記レーザ光を透過する熱伝導体を前記第１の樹脂部材及び前記第２の樹脂部材に対してレーザ光入射側に配置し、前記熱伝導体をヒートシンクとして前記レーザ光の照射を行うことを特徴とする請求項１記載の樹脂溶着方法。 The heat conductor that transmits the laser light is disposed on the laser light incident side with respect to the first resin member and the second resin member, and the laser light is irradiated using the heat conductor as a heat sink. The resin welding method according to claim 1, wherein:
PCT/JP2009/070901 2009-12-15 2009-12-15 Method of welding resin WO2011074071A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003164985A (en) * 2001-11-26 2003-06-10 Denso Corp Method for simultaneous batch melting of material by laser beam and device
JP2005119050A (en) * 2003-10-14 2005-05-12 Denso Corp Resin molded product and its manufacturing method
JP2010000622A (en) * 2008-06-18 2010-01-07 Hamamatsu Photonics Kk Resin welding method
JP2010000617A (en) * 2008-06-18 2010-01-07 Hamamatsu Photonics Kk Resin welding method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003164985A (en) * 2001-11-26 2003-06-10 Denso Corp Method for simultaneous batch melting of material by laser beam and device
JP2005119050A (en) * 2003-10-14 2005-05-12 Denso Corp Resin molded product and its manufacturing method
JP2010000622A (en) * 2008-06-18 2010-01-07 Hamamatsu Photonics Kk Resin welding method
JP2010000617A (en) * 2008-06-18 2010-01-07 Hamamatsu Photonics Kk Resin welding method

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