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JP4103843B2 - Laser welding method of resin material - Google Patents

Laser welding method of resin material Download PDF

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Publication number
JP4103843B2
JP4103843B2 JP2004128324A JP2004128324A JP4103843B2 JP 4103843 B2 JP4103843 B2 JP 4103843B2 JP 2004128324 A JP2004128324 A JP 2004128324A JP 2004128324 A JP2004128324 A JP 2004128324A JP 4103843 B2 JP4103843 B2 JP 4103843B2
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Japan
Prior art keywords
resin material
resin
laser
holding jig
jig
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Expired - Lifetime
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JP2004128324A
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Japanese (ja)
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JP2005305913A (en
Inventor
毅 早河
保典 河本
文男 河西
洋三 祝
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Denso Corp
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Denso Corp
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Publication of JP2005305913A publication Critical patent/JP2005305913A/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
    • 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
    • B29C66/8126—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
    • B29C66/81266—Optical properties, e.g. transparency, reflectivity
    • B29C66/81267—Transparent to electromagnetic radiation, e.g. to visible light
    • 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
    • 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
    • B29C66/114—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
    • B29C66/05—Particular design of joint configurations
    • B29C66/302—Particular design of joint configurations the area to be joined comprising melt initiators
    • B29C66/3022—Particular design of joint configurations the area to be joined comprising melt initiators said melt initiators being integral with at least one of the parts to be joined
    • B29C66/30223—Particular design of joint configurations the area to be joined comprising melt initiators said melt initiators being integral with at least one of the parts to be joined said melt initiators being rib-like
    • 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
    • B29C66/345—Progressively making the joint, e.g. starting from the middle
    • 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
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—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
    • B29C66/814—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 design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81427—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • 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
    • B29C65/1603—Laser beams characterised by the type of electromagnetic radiation
    • B29C65/1606—Ultraviolet [UV] radiation, e.g. by ultraviolet excimer lasers
    • 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
    • B29C65/1661—Laser beams characterised by the way of heating the interface scanning at least one of the parts to be joined scanning repeatedly, e.g. quasi-simultaneous 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
    • B29C66/01—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
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—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
    • 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
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/863—Robotised, e.g. mounted on a robot arm
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • 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
    • B29K2909/00—Use of inorganic materials not provided for in groups B29K2803/00 - B29K2807/00, as mould material
    • B29K2909/08—Glass
    • 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
    • B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
    • B29K2995/0026—Transparent
    • B29K2995/0027—Transparent for light outside the visible spectrum

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

Description

本発明は、レーザ光に対して透過性のある樹脂材と吸収性のある樹脂材とを重ね合わせて、その接合部にレーザ光を照射することで両者を溶着する樹脂材のレーザ溶着方法に関する。   The present invention relates to a laser welding method for a resin material in which a resin material that is transmissive to laser light and a resin material that is absorptive are overlapped, and both are welded by irradiating the joint with laser light. .

従来より、レーザ光に対して透過性のある樹脂材と吸収性のある樹脂材とを重ね合わせて、その接合部に透過性樹脂材越しにレーザ光を照射することで、吸収性樹脂材を発熱させ、互いを溶融することで両者を溶着する樹脂材のレーザ溶着は、知られている。このようなレーザ光による樹脂材の溶着技術は、レーザの低価格化とともに、製品の小型化、コストダウン及び高信頼性へのニーズへの貢献が期待されている。またこのレーザ溶着工法は、従来の工法と比較して非接触、３次元加工が可能となることから、今後採用が飛躍的に増加するものと考えられている。   Conventionally, an absorptive resin material is obtained by superimposing a resin material that is permeable to laser light and an absorptive resin material, and irradiating the joint portion with laser light through the transmissive resin material. Laser welding of resin materials that generate heat and melt them together is known. Such a technique for welding a resin material using laser light is expected to contribute to the needs for downsizing of the product, cost reduction, and high reliability as well as the cost reduction of the laser. In addition, this laser welding method is considered to increase dramatically in the future because non-contact and three-dimensional processing becomes possible as compared with conventional methods.

ところで、従来の技術では、図３に示すようにガラス板等の透明な材料により押え治具３を形成し、重ね合わされた両樹脂材１，２の透過性樹脂材２の上から押さえ、透明な押え治具３越しにレーザ光Ｌを照射することで、吸収性樹脂材１と透過性樹脂材２とを溶着する方法が多く用いられている。しかしながら、この溶着方法では、押え治具３及び両樹脂材１，２がともに略平坦な面で構成されているため、溶着部に加える面圧を十分に確保することが困難であり、両樹脂材間に隙間Ｄ等が存在すると加圧が十分に伝わらず、ボイド及び未溶着等の欠陥を発生するという問題がある。   By the way, in the prior art, as shown in FIG. 3, the holding jig 3 is formed of a transparent material such as a glass plate, and pressed from above the transparent resin material 2 of the two resin materials 1 and 2 to be transparent. A method of welding the absorbent resin material 1 and the transmissive resin material 2 by irradiating the laser beam L through the holding jig 3 is often used. However, in this welding method, since both the holding jig 3 and the both resin materials 1 and 2 are configured by a substantially flat surface, it is difficult to ensure a sufficient surface pressure applied to the welded portion. When gaps D and the like exist between the materials, there is a problem that pressurization is not sufficiently transmitted and defects such as voids and unwelded are generated.

また、溶着部に加える面圧を確保する手段として、加圧を増加させる必要があるが、逆に押え治具の剛性により透明な押え治具にそりが発生し、均一な加圧が得られないという問題がある。
また、本出願人が先に提案したように、吸収性樹脂材にリブ（突起）を設けることで面圧を確保し、両樹脂材間の隙間を無くすことで良好な溶着を得るという方法では、両樹脂材間の継ぎ手形状が複雑化するため、樹脂材の成形型の設計が困難であるという短所がある。このため、樹脂製品の形状はそのままで、即ち成形型はそのままで、治具によりレーザ溶着品質を確保するレーザ溶着技術が早期に確立する必要が求められている。 In addition, as a means to ensure the surface pressure applied to the welded portion, it is necessary to increase the pressure, but conversely, the transparent presser jig warps due to the rigidity of the presser jig, and uniform pressurization is obtained. There is no problem.
In addition, as proposed previously by the present applicant, by providing ribs (protrusions) on the absorbent resin material, the surface pressure is secured, and by eliminating the gap between the two resin materials, good welding is obtained. Since the joint shape between the two resin materials is complicated, it is difficult to design the resin material mold. For this reason, it is necessary to establish a laser welding technique for ensuring laser welding quality with a jig at an early stage while keeping the shape of the resin product as it is, that is, the mold as it is.

更に、透明な押え治具を使用する場合にあっては、傷等により溶着時に発熱すると透過性樹脂材と透明な押え治具との間で熱が伝わり、汚れるため押え治具の交換が必要になるという問題がある。   Furthermore, when using a transparent presser jig, if heat is generated during welding due to scratches etc., heat is transferred between the transparent resin material and the transparent presser jig, and the presser jig must be replaced because it becomes dirty. There is a problem of becoming.

また、上記従来技術の方法では、レーザ光照射側の透過性樹脂材２や透明な押え治具３によってレーザ光Ｌが屈折、散乱するため、溶着部分においてレーザ光Ｌの小径化が困難となり、微細溶着は難しいという問題があった。この問題を解決するために、特許文献１では、レーザ照射側の押え治具にレーザ光を集光するレンズ機能をもたせることによって、微細溶着を可能としている。   Further, in the above prior art method, since the laser light L is refracted and scattered by the transparent resin material 2 and the transparent holding jig 3 on the laser light irradiation side, it is difficult to reduce the diameter of the laser light L at the welded portion. There was a problem that fine welding was difficult. In order to solve this problem, in Patent Document 1, fine welding is possible by providing the holding jig on the laser irradiation side with a lens function for condensing laser light.

特開２００１−３３４５７８号公報（図５，６，７）JP 2001-334578 A (FIGS. 5, 6, and 7)

しかしながら、この特許文献１によるレーザ溶着方法においても、溶着時に傷、ごみ等の要因でレンズ機能付押え治具が汚れ、押え治具の交換が必要となる。このレンズ機能付押え治具は、製造コストが高く、押え治具の頻繁な交換はコストアップを招くという問題がある。   However, even in the laser welding method according to Patent Document 1, the holding jig with a lens function is soiled due to scratches, dust, or the like during welding, and the holding jig needs to be replaced. This holding jig with a lens function has a problem that the manufacturing cost is high, and frequent replacement of the holding jig causes an increase in cost.

本発明は、上記問題に鑑みてなされたもので、その第１の目的は、治具側の構造を改良することで、両樹脂材間の十分な面圧が確保でき、両者を良好な溶着が可能となる樹脂材のレーザ溶着方法を提供することである。
本発明の第２の目的は、透明な押え治具と透過性樹脂材との熱伝導を防止して、押え治具の汚染を防ぎ、押え治具の交換を削減して、コストの低減を図ることができる樹脂材のレーザ溶着方法を提供することである。 The present invention has been made in view of the above problems, and its first object is to improve the structure on the jig side so that a sufficient surface pressure between the two resin materials can be secured, and both are welded well. It is to provide a laser welding method of a resin material that can be performed.
The second object of the present invention is to prevent heat conduction between the transparent holding jig and the permeable resin material, prevent contamination of the holding jig, reduce replacement of the holding jig, and reduce cost. It is to provide a laser welding method of a resin material that can be achieved.

本発明は、前記課題を解決するための手段として、特許請求の範囲の各請求項に記載の樹脂材のレーザ溶着方法を提供する。
請求項１に記載の樹脂材のレーザ溶着方法は、レーザ光に対して透過性の材料からなる平板状の押え治具であって、レーザ光に対して透過性のある第２の樹脂材に面するこの押え治具の対向面に凹条溝部を形成すると共に、第２の樹脂材に面する第１の樹脂材の対向面に押え治具の凹条溝部に対応して凸条部が形成されており、押え治具で第１、第２の樹脂材を押圧した状態で、レーザ光を凹条溝部を通って溶着部に照射するようにしたものであり、これにより、治具側の構造を変えることにより、両樹脂材間の溶着部に十分な面圧を付加することができ、良好な溶着が可能となる。また、溶着時に発生した熱が第２の樹脂材と押え治具間で伝わることもなく、押え治具の汚損が防止でき、押え治具の交換頻度を低減することができる。 The present invention provides a laser welding method of a resin material according to each of the claims as means for solving the above-mentioned problems.
The laser welding method for a resin material according to claim 1 is a flat pressing jig made of a material that is transmissive to laser light, and the second resin material that is transmissive to laser light. A concave groove portion is formed on the facing surface of the pressing jig facing the convex groove portion corresponding to the concave groove portion of the pressing jig on the opposing surface of the first resin material facing the second resin material. In this state, the first and second resin materials are pressed by the holding jig, and the laser beam is irradiated to the welded portion through the grooved portion. By changing the structure, a sufficient surface pressure can be applied to the welded portion between the two resin materials, and good welding can be achieved. Further, heat generated during welding is not transmitted between the second resin material and the holding jig, so that the holding jig can be prevented from being soiled, and the frequency of changing the holding jig can be reduced.

請求項２の該レーザ溶着方法は、第１の樹脂材の凸条部の上面を平坦にしたものであり、これにより、面圧を溶着部に有効に付加することができる。 The laser welding method according to claim 2 is a method in which the upper surface of the convex portion of the first resin material is flattened, whereby a surface pressure can be effectively applied to the welded portion.

請求項３の該レーザ溶着方法は、押え治具の凹条溝部の幅と第１の樹脂材の凸条突部の幅とを略同一になるようにしたものであり、これにより、両樹脂材間の溶着部に有効に面圧を加えることができると共に、押え治具と第２の樹脂材間の熱伝達も効果的に防止できる。 The laser welding method according to claim 3 is such that the width of the concave groove portion of the holding jig is substantially the same as the width of the convex protrusion portion of the first resin material. A surface pressure can be effectively applied to the welded portion between the materials, and heat transfer between the holding jig and the second resin material can be effectively prevented.

請求項４の該レーザ溶着方法は、押え治具の透過性材料が、ポリカーボネート（ＰＣ）か、又はＰＣをコーティングした材料か、又は強化ガラスであることを規定したものであり、これにより、レーザ光の透過性と共に十分な強度が確保できる。 The laser welding method according to claim 4 stipulates that the transparent material of the holding jig is polycarbonate (PC), a material coated with PC, or tempered glass. Sufficient strength can be secured together with light transmission.

以下、図面に従って本発明の実施の態様の樹脂材のレーザ溶着方法について説明する。図１は、本発明の第１実施形態の樹脂材のレーザ溶着方法について説明する図である。レーザ溶着は、レーザ光に対して吸収性のある第１の樹脂材１とレーザ光に対して透過性のある第２の樹脂材２とを重ね合わせて、両者を当接した状態で、第２の樹脂材２側からレーザ光Ｌをその接合部に照射することにより行われる。この場合、通常は上下２枚の押え治具３（図１，２には、上側の押え治具のみが示されている）によって、第１の樹脂材１と第２の樹脂材２とを互いに密着させるように押圧して、押え治具３側からレーザ光Ｌを照射する。そのため、少なくとも照射側の押え治具３は、レーザ光を透過する材料から作成されている。   Hereinafter, a laser welding method of a resin material according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram for explaining a laser welding method of a resin material according to the first embodiment of the present invention. Laser welding is performed in such a manner that a first resin material 1 that absorbs laser light and a second resin material 2 that is transmissive to laser light are superposed and in contact with each other. 2 is performed by irradiating the joint portion with laser light L from the resin material 2 side. In this case, the first resin material 1 and the second resin material 2 are usually connected by two upper and lower pressing jigs 3 (FIGS. 1 and 2 only show the upper pressing jig). It presses so that it may mutually contact | abut, and the laser beam L is irradiated from the holding jig 3 side. Therefore, at least the holding jig 3 on the irradiation side is made of a material that transmits laser light.

押え治具３及び第２の樹脂材２側から照射されたレーザ光Ｌは、押え治具３と第２の樹脂材２を透過して吸収性のある第１の樹脂材１の当接面に達し、ここで吸収される。この第１の樹脂材１の当接面に吸収されたレーザ光Ｌがエネルギとして蓄積される結果、第１の樹脂材１の当接面が加熱溶融されると共に、この第１の樹脂材１の当接面からの熱伝達により、透過性の第２の樹脂材２の当接面が加熱溶融される。この状態で第１の樹脂材１と第２の樹脂材２の当接面同志（接合部）を圧着させれば、第１と第２の樹脂材１，２は一体的に溶着接合することができる。   The laser beam L irradiated from the holding jig 3 and the second resin material 2 side is transmitted through the holding jig 3 and the second resin material 2, and the contact surface of the first resin material 1 having the absorptivity. Reached and absorbed here. As a result of the laser light L absorbed on the contact surface of the first resin material 1 being accumulated as energy, the contact surface of the first resin material 1 is heated and melted, and the first resin material 1 is also melted. By the heat transfer from the contact surface, the contact surface of the permeable second resin material 2 is heated and melted. If the contact surfaces (joining portions) of the first resin material 1 and the second resin material 2 are pressure-bonded in this state, the first and second resin materials 1 and 2 are integrally welded. Can do.

こうして得られた接合部では、接合面同志が溶融されて接合されており、この接合面同志の間では第１及び第２の樹脂材１，２を構成する両樹脂が溶融して互いに入り込み絡まった状態（相溶状態）が形成されているため、強固な接合状態になる。このようなレーザ光の照射による溶着は、その接合強度が両樹脂材１，２の接合部への面圧の付加に依存している。また、第１と第２の樹脂材１，２の間に隙間Ｇが存在すると、十分な面圧が確保することが困難になり、その結果、ボイド等の溶着欠陥を発生する原因となる。   In the joint portion thus obtained, the joint surfaces are melted and joined, and between the joint surfaces, both resins constituting the first and second resin materials 1 and 2 melt and enter each other. In this case, a strong joined state is obtained. In such welding by irradiation with laser light, the bonding strength depends on the application of surface pressure to the bonded portion of both resin materials 1 and 2. Further, if there is a gap G between the first and second resin materials 1 and 2, it becomes difficult to ensure a sufficient surface pressure, and as a result, it causes a welding defect such as a void.

そこで、本実施形態では、平板状の押え治具３の第２の樹脂材２に面する対向面に凸条部３１を形成している。この凸条部３１は、押え治具３の対向面における第１と第２の樹脂材１，２の溶着部に対応する位置に設けられている。好ましくは、凸条部３１の上面は平坦になっている。したがって、第１の樹脂材１と第２の樹脂材２との接合部は、押え治具３の凸条部３１によって局部的に押圧されることによって面圧を十分に高めることができ、ボイド等の溶着欠陥のない良好な溶着が得られる。
なお、レーザ光Ｌは、凸条部３１を透過して接合部（溶着部）に照射される。
押え治具３は、その大部分が溶接対象物である樹脂材１、２の形状に沿った平板状あるいは曲面状の形状に形成されることができる。押え治具３は、その大部分の面で樹脂材１、２を互いに押し付けるように樹脂材２に接触することができる。凸条部３１は、凸状部とも呼びうるものである。凸条部３１は、押え治具３の一部分にのみ形成されている。凸条部３１は、それが形成された位置の近傍の押え治具３の面より樹脂材２に向けて突出する。凸条部３１は、樹脂材１、２の間に形成される溶着部の形状に対応して広がる形状をもつことができる。凸条部３１は、レーザ光Ｌの照射経路に沿った範囲に渡って広がる形状をもつことができる。レーザ光Ｌが走査され、その照射経路が細長く延びる場合には、凸条部３１は、押え治具３の面上に条線として細長く延在して形成されることができる。レーザ光Ｌが点状に照射される場合には、凸条部３１は、円柱状突起として形成することができる。また、レーザ光Ｌが接近してあるいは重複してラスタスキャンされる場合には、凸条部３１は、所定の範囲に広がる凸状台地として形成することができる。
この第１実施形態によると、少なくとも２つの樹脂材１、２を部分的に溶着してなる樹脂成形品が得られる。樹脂材１、２は、予め所定の形状に成形された後に、溶着されることができる。樹脂成形品は、２つの樹脂材１、２の接触面において両樹脂材を部分的に溶融、再硬化させて接合して形成されている。樹脂成型品は、その内部に溶融痕跡としての溶着部を有している。そして、その溶着部に対応する樹脂成型品の表面には、樹脂成型品をその厚さ方向に押圧した痕跡としての押圧痕を有することができる。例えば、溶着部の上に押圧痕は位置することができる。この押圧痕は、押え治具３の凸条部３１に対応して、樹脂成形品の表面のうち、溶着部に対応する部位にのみ形成されることができる。例えば、細長く延在する溶着部に沿って延在して形成されることができる。押圧痕は、透明な樹脂材２の表面にのみ形成されることができる。 Therefore, in the present embodiment, the ridge portion 31 is formed on the facing surface of the flat pressing jig 3 facing the second resin material 2. The ridge portion 31 is provided at a position corresponding to the welded portion of the first and second resin materials 1 and 2 on the facing surface of the pressing jig 3. Preferably, the upper surface of the ridge portion 31 is flat. Therefore, the joint portion between the first resin material 1 and the second resin material 2 can be sufficiently increased in surface pressure by being locally pressed by the protruding strip portion 31 of the holding jig 3, and the void Good welding without welding defects such as is obtained.
In addition, the laser beam L passes through the protruding strip portion 31 and is irradiated to the joint portion (welded portion).
Most of the holding jig 3 can be formed into a flat plate shape or a curved shape along the shape of the resin materials 1 and 2 which are welding objects. The holding jig 3 can come into contact with the resin material 2 so as to press the resin materials 1 and 2 against each other on most of the surfaces. The protruding portion 31 can also be called a protruding portion. The protruding portion 31 is formed only on a part of the pressing jig 3. The protruding portion 31 protrudes toward the resin material 2 from the surface of the holding jig 3 in the vicinity of the position where the protruding portion 31 is formed. The protruding portion 31 can have a shape that expands in correspondence with the shape of the welded portion formed between the resin materials 1 and 2. The protruding portion 31 can have a shape that extends over a range along the irradiation path of the laser light L. When the laser beam L is scanned and the irradiation path extends in an elongated manner, the protruding strip portion 31 can be formed to extend in the form of a strip on the surface of the holding jig 3. When the laser beam L is irradiated in a dot shape, the ridge portion 31 can be formed as a cylindrical protrusion. Moreover, when the laser beam L approaches or overlaps and is raster-scanned, the ridge portion 31 can be formed as a convex plateau that spreads over a predetermined range.
According to the first embodiment, a resin molded product obtained by partially welding at least two resin materials 1 and 2 is obtained. The resin materials 1 and 2 can be welded after being molded into a predetermined shape in advance. The resin molded product is formed by partially melting and re-curing both resin materials on the contact surfaces of the two resin materials 1 and 2 and joining them. The resin molded product has a welded portion as a melted trace therein. And the surface of the resin molded product corresponding to the welding part can have a press mark as a mark which pressed the resin molded product in the thickness direction. For example, the press mark can be located on the welded portion. This pressing mark can be formed only on the portion of the surface of the resin molded product corresponding to the welded portion corresponding to the protruding strip portion 31 of the pressing jig 3. For example, it can be formed to extend along a long and narrow welded portion. The pressing mark can be formed only on the surface of the transparent resin material 2.

図２は、本発明の第２実施形態の樹脂材のレーザ溶着方法を説明する図である。この実施形態では、平板状の押え治具３の第２の樹脂材２に面する対向面に先の凸条部３１に代えて凹条溝部３２を形成している。この凹条溝部３２は、押え治具３の対向面における第１と第２の樹脂材１，２の溶着部に対応する位置に設けられている。これによって、第１と第２の樹脂材１，２の接合部（溶着部）の面圧が改善される。この面圧を更に改善するためには、吸収性のある第１の樹脂材１の第２の樹脂材２に面する対向面に凸条部１１を形成する。第１の樹脂材１の凸条部１１は、接合部に対応する位置に設けられる。好ましくは、この凸条部１１の上面も平坦になっている。このように、押え治具３の凹条溝部３２と第１の樹脂材１の凸条部１１とは、溶着部に略対応する位置に設けられ、対向している。凹条溝部３２の幅Ｄと凸条部１１の幅ｄとは、略同一であることが好ましい。   FIG. 2 is a view for explaining a laser welding method of a resin material according to the second embodiment of the present invention. In this embodiment, a concave groove portion 32 is formed on the opposing surface of the flat pressing jig 3 facing the second resin material 2 instead of the previous convex portion 31. The concave groove portion 32 is provided at a position corresponding to the welded portion of the first and second resin materials 1 and 2 on the facing surface of the pressing jig 3. Thereby, the surface pressure of the joint portion (welded portion) between the first and second resin materials 1 and 2 is improved. In order to further improve the surface pressure, the ridges 11 are formed on the opposing surface of the first resin material 1 having the absorptivity facing the second resin material 2. The ridge portion 11 of the first resin material 1 is provided at a position corresponding to the joint portion. Preferably, the upper surface of the ridge portion 11 is also flat. As described above, the groove portion 32 of the holding jig 3 and the protrusion portion 11 of the first resin material 1 are provided at positions substantially corresponding to the welded portions and face each other. It is preferable that the width D of the concave groove portion 32 and the width d of the convex portion 11 are substantially the same.

したがって、第２実施形態では、溶着部への加圧力を十分に確保でき、ボイド等の溶着欠陥のない良好な溶着が得られると共に、溶着部に対応する第２の樹脂材２と押え治具３の部分は、凹条溝部３２の存在によって両者が直接接触していないので、溶着部の熱が第２の樹脂材２から押え治具３に伝わりにくいので、熱の伝導による押え治具３の汚れが防止できる。
押え治具３は、その大部分が溶接対象物である樹脂材１、２の形状に沿った平板状あるいは曲面状の形状に形成されることができる。押え治具３は、その大部分の面で樹脂材１、２を互いに押し付けるように樹脂材２に接触することができる。凹条溝部３２は、押え治具３の一部分にのみ形成されている。凹条溝部３２は、凹状部とも呼びうるものである。凹条溝部３２は、それが形成された位置の近傍の押え治具３の面より樹脂材２から離れて位置する底面と、凹条溝部３２を区画する側壁とを有する。凹条溝部３２は、樹脂材１、２の間に形成される溶着部の形状に対応して広がる形状をもつことができる。凹条溝部３２は、レーザ光Ｌの照射経路に沿った範囲に渡って広がる形状をもつことができる。レーザ光Ｌが走査され、その照射経路が細長く延びる場合には、凹条溝部３２は、押え治具３の面上に凹型断面をもった溝として細長く延在して形成されることができる。レーザ光Ｌが点状に照射される場合には、凹条溝部３２は、穴状に形成することができる。また、レーザ光Ｌが接近してあるいは重複してラスタスキャンされる場合には、凹条溝部３２は、所定の範囲に広がる凹状盆地として形成することができる。
この第２実施形態によると、少なくとも２つの樹脂材１、２を部分的に溶着してなる樹脂成形品が得られる。樹脂材１、２は、予め所定の形状に成形された後に、溶着されることができる。樹脂成形品は、２つの樹脂材１、２の接触面において両樹脂材を部分的に溶融、再硬化させて接合して形成されている。樹脂成型品は、その内部に溶融痕跡としての溶着部を有している。そして、その溶着部に対応する樹脂成型品の表面には、樹脂成型品をその厚さ方向に押圧した痕跡としての押圧痕が残されない。押圧痕は、樹脂成形品の表面のうち、溶着部に対応しない部位に残されることができる。この押圧痕は、樹脂成形品の表面のうち、溶着部に対応する部位にのみ残されない。押圧痕は、透明な樹脂材２の表面にのみ形成されることができる。 Therefore, in the second embodiment, a sufficient pressure can be ensured on the welded portion, a good weld free from welding defects such as voids can be obtained, and the second resin material 2 and the holding jig corresponding to the welded portion can be obtained. Since the portion 3 is not in direct contact due to the presence of the concave groove portion 32, the heat of the welded portion is difficult to be transferred from the second resin material 2 to the holding jig 3, so that the holding jig 3 by heat conduction is used. Can prevent dirt.
Most of the holding jig 3 can be formed into a flat plate shape or a curved shape along the shape of the resin materials 1 and 2 which are welding objects. The holding jig 3 can come into contact with the resin material 2 so as to press the resin materials 1 and 2 against each other on most of the surfaces. The concave groove 32 is formed only in a part of the pressing jig 3. The concave groove portion 32 can also be called a concave portion. The concave groove portion 32 has a bottom surface that is positioned farther from the resin material 2 than the surface of the holding jig 3 in the vicinity of the position where the concave groove portion 32 is formed, and a side wall that defines the concave groove portion 32. The concave groove portion 32 can have a shape that expands in correspondence with the shape of the welded portion formed between the resin materials 1 and 2. The concave groove portion 32 can have a shape that extends over a range along the irradiation path of the laser light L. When the laser beam L is scanned and the irradiation path is elongated, the concave groove portion 32 can be elongated and formed as a groove having a concave cross section on the surface of the holding jig 3. When the laser beam L is irradiated in a dot shape, the concave groove portion 32 can be formed in a hole shape. Moreover, when the laser beam L approaches or overlaps and is raster-scanned, the concave groove part 32 can be formed as a concave basin extending in a predetermined range.
According to the second embodiment, a resin molded product obtained by partially welding at least two resin materials 1 and 2 is obtained. The resin materials 1 and 2 can be welded after being molded into a predetermined shape in advance. The resin molded product is formed by partially melting and re-curing both resin materials on the contact surfaces of the two resin materials 1 and 2 and joining them. The resin molded product has a welded portion as a melted trace therein. And the press trace as a trace which pressed the resin molded product in the thickness direction is not left on the surface of the resin molded product corresponding to the welding part. A press mark can be left in the site | part which does not correspond to a welding part among the surfaces of a resin molded product. This pressing mark is not left only in the part corresponding to the welded portion on the surface of the resin molded product. The pressing mark can be formed only on the surface of the transparent resin material 2.

本発明の実施形態においては、押え治具３の透過性の材料は、レーザ光に対して透過性の優れた材料であって、ある程度の強度があれば任意である。例えば、ポリカーボネート（ＰＣ）や、このＰＣをコーティングした材料、及び強化ガラス等が好ましい。   In the embodiment of the present invention, the transparent material of the holding jig 3 is an arbitrary material as long as it has a certain level of strength and is excellent in laser beam transparency. For example, polycarbonate (PC), a material coated with this PC, and tempered glass are preferable.

レーザ光を吸収する第１の樹脂材１の種類としては、熱可塑性を有し、レーザ光を透過せずに吸収しうるものであれば特に限定されない。例えば、ポリアミド（ＰＡ）、ポリエチレン（ＰＥ）、ポリプロピレン（ＰＰ）、ポリカーボネート（ＰＣ）、ポリオキシメチレン（ＰＯＭ）、アクリロニトリル−ブタジエン−スチレン（ＡＢＳ）、ポリブチレンテレフタレート（ＰＢＴ）、ポリフェニレンスルフィド（ＰＰＳ）、アクリル（ＰＭＭＥ）等の樹脂材に、カーボンブラック、染料や顔料等の所定の着色材を混入したものを使用することができる。
レーザ光を透過する第２の樹脂材２の種類としては、熱可塑性を有し、レーザ光に対して所定以上の透過率を有するものであれば特に限定されない。基本的に上記に例示した樹脂材が使用可能である。また透過性を確保できれば着色材を混入してもよい。
なお、第１及び第２の樹脂材１，２には、必要に応じて、ガラス繊維やカーボン繊維などの補強繊維を添加してもよい。 The type of the first resin material 1 that absorbs laser light is not particularly limited as long as it has thermoplasticity and can absorb without transmitting laser light. For example, polyamide (PA), polyethylene (PE), polypropylene (PP), polycarbonate (PC), polyoxymethylene (POM), acrylonitrile-butadiene-styrene (ABS), polybutylene terephthalate (PBT), polyphenylene sulfide (PPS) A resin material such as acrylic (PMME) mixed with a predetermined colorant such as carbon black, a dye or a pigment can be used.
The type of the second resin material 2 that transmits the laser beam is not particularly limited as long as it has thermoplasticity and has a transmittance equal to or higher than a predetermined level with respect to the laser beam. Basically, the resin materials exemplified above can be used. Further, a colorant may be mixed as long as the permeability can be secured.
In addition, you may add reinforcement fibers, such as glass fiber and carbon fiber, to the 1st and 2nd resin materials 1 and 2 as needed.

また、レーザ光に対して吸収性のある第１の樹脂材１とレーザ光に対して透過性のある第２の樹脂材２の組み合わせについては、互いに相溶性のあるもの同志の組み合わせが好適である。このような組み合わせとして、同種の樹脂同志の組み合わせの他、異種の樹脂の組み合わせも可能である。   In addition, as for the combination of the first resin material 1 that absorbs laser light and the second resin material 2 that is transparent to laser light, a combination of those compatible with each other is preferable. is there. As such a combination, in addition to a combination of the same kind of resins, a combination of different kinds of resins is also possible.

加熱源として用いるレーザ光の種類としては、レーザ光を透過させる透過性樹脂の吸収スペクトルや板厚（透過長）等の関係で、透過性樹脂材内での透過率が所定値以上となるような波長を有するものが適宜選択される。例えば、ＹＡＧレーザ、半導体レーザ、ガラス−ネオジウムレーザ、ルビーレーザ、ヘリウム−ネオンレーザ、クリプトンレーザ、アルゴンレーザ、水素レーザ、窒素レーザ等を用いることができる。   The type of laser light used as the heating source is such that the transmittance in the transparent resin material becomes a predetermined value or more due to the absorption spectrum, plate thickness (transmission length), etc. of the transparent resin that transmits the laser light. One having a suitable wavelength is appropriately selected. For example, a YAG laser, a semiconductor laser, a glass-neodymium laser, a ruby laser, a helium-neon laser, a krypton laser, an argon laser, a hydrogen laser, a nitrogen laser, or the like can be used.

レーザの照射方法としては、レーザ光を１点に集光させて接合部分を走査して溶着させる方法と、複数のレーザ光を用いて、溶着するパターンに一括で溶着を行う方法とがある。レーザを走査させる場合、レーザ光をＸ−Ｙテーブルやガルバノスキャニングミラーなどにより走査させる方法や、レーザ光を固定して溶着される樹脂材側を移動させる方法等がある。このように、いずれの方法を採用するにせよ、レーザの出力、照射密度や加工速度（移動速度）等の照射条件は、樹脂の種類等に応じて適宜設定可能である。   As a laser irradiation method, there are a method of condensing a laser beam at one point and scanning and welding a joint portion, and a method of performing a batch welding on a pattern to be welded using a plurality of laser beams. In the case of scanning the laser, there are a method of scanning the laser beam with an XY table or a galvano scanning mirror, a method of moving the resin material side to be welded while fixing the laser beam, and the like. As described above, regardless of which method is employed, irradiation conditions such as laser output, irradiation density, and processing speed (moving speed) can be appropriately set according to the type of resin.

以上説明したように、本発明の実施形態では、透明な押え治具に凸条部を設けることで、溶着部の加圧力を十分に確保することができる。一般にレーザ溶着では、樹脂は溶融膨張するため、透過性樹脂材を押し上げるだけの十分な圧力が発生することが知られている。そのような圧力にも負けない押えをすることで、樹脂の凝固時に引け、ボイド等の欠陥のない溶着が実現できる。また、加圧が十分に伝わることで、今まで過剰に与えていた従来の方法よりも加圧効率が上がるため、押え治具まわりを改善することも可能である。気密が必要な製品の場合、レーザ光を連続的に走査し、オーバーラップさせることが重要である。また、レーザ光は２次元平面の走査だけでなく、ロボット等で保持することにより３次元走査も可能である。
更に、吸収性樹脂材に凸条部を設け、透明な押え治具に凹条溝を設けることでも同様の溶着効果が得られ、押え治具の傷、汚れによる交換等の必要が少なくなりコストダウンを図ることもできる。 As described above, in the embodiment of the present invention, it is possible to sufficiently secure the pressing force of the welded portion by providing the protruding portion on the transparent holding jig. In general, in laser welding, since the resin melts and expands, it is known that sufficient pressure is generated to push up the permeable resin material. By holding the presser against such pressure, it is possible to realize welding without defects such as voids and voids when the resin is solidified. Further, since the pressurization is sufficiently transmitted and the pressurization efficiency is increased as compared with the conventional method which has been excessively applied so far, it is possible to improve the periphery of the presser jig. In the case of products that require airtightness, it is important that laser beams are continuously scanned and overlapped. Further, the laser beam can be scanned not only in a two-dimensional plane but also in a three-dimensional scan by being held by a robot or the like.
Furthermore, the same welding effect can be obtained by providing a convex strip on the absorbent resin material and a concave groove on the transparent holding jig, reducing the need for replacement of the holding jig due to scratches and dirt, and reducing the cost. You can also go down.

このように、本発明の実施形態は、レーザ溶着に必要な部材同志の密着性を、高効率且つ安定的に実現できると共に、樹脂の損傷もないため、例えばインストルメントパネル、インテークマニホールド等の自動車部品、電池ケース等の電気・電子部品などにおける樹脂製品に必要な、小型化、高信頼性及びコストダウンを図ることができる。   As described above, the embodiment of the present invention can realize the adhesion between the members necessary for the laser welding with high efficiency and stability, and is not damaged by the resin. For example, an automobile such as an instrument panel, an intake manifold, etc. It is possible to achieve downsizing, high reliability, and cost reduction necessary for resin products such as electric parts and electronic parts such as battery cases.

本発明の第１実施形態の樹脂材のレーザ溶着方法を説明する図である。It is a figure explaining the laser welding method of the resin material of 1st Embodiment of this invention. 本発明の第２実施形態の樹脂材のレーザ溶着方法を説明する図である。It is a figure explaining the laser welding method of the resin material of 2nd Embodiment of this invention. 従来技術の樹脂材のレーザ溶着方法を説明する図である。It is a figure explaining the laser welding method of the resin material of a prior art.

符号の説明Explanation of symbols

１…第１の樹脂材（吸収性樹脂材）
１１…凸条部
２…第２の樹脂材（透過性樹脂材）
３…押え治具
３１…凸条部
３２…凹条溝部
Ｌ…レーザ光 1 ... 1st resin material (absorbent resin material)
11 ... ridge part 2 ... 2nd resin material (permeable resin material)
3 ... Holding jig 31 ... Projection strip 32 ... Concave groove L ... Laser beam

Claims (4)

レーザ光に対して吸収性のある第１樹脂材と、レーザ光に対して透過性のある第２の樹脂材とを重ね合わせると共に、レーザ光に対して透過性の材料からなる平板状の押え治具によって前記第１と第２の樹脂材とを互いに密着させるように押圧している状態で、前記第２の樹脂材に面する前記押え治具側によりレーザ光を照射して、前記第１の樹脂材を加熱して、互いに両樹脂材を溶融することで両者を溶着する樹脂材のレーザ溶着方法において、
前記第２の樹脂材に面する前記押え治具の対向面に、溶着部に対応して凹条溝部を形成すると共に、前記第２の樹脂材に面する前記第１の樹脂材の対向面に、前記押え治具の前記凹条溝部に対応して凸条部が形成されており、前記押え治具で両樹脂材を押圧した状態で、レーザ光を前記凹条溝部を通って溶着部に照射することを特徴とする樹脂材のレーザ溶着方法。 A flat plate-shaped presser made of a material that is transparent to the laser beam and a first resin material that is absorbable to the laser beam and a second resin material that is transparent to the laser beam. In a state where the first and second resin materials are pressed against each other by a jig, a laser beam is irradiated from the holding jig side facing the second resin material, and the first In the laser welding method of the resin material which heats the resin material of 1 and melts both resin materials to weld them together,
On the facing surface of the holding jig facing the second resin material, a concave groove is formed corresponding to the welded portion, and the facing surface of the first resin material facing the second resin material In addition, a convex portion is formed corresponding to the concave groove portion of the holding jig, and in a state where both resin materials are pressed by the holding jig, a laser beam is passed through the concave groove portion and is welded. A method of laser welding a resin material, characterized by irradiating the resin. 前記第１の樹脂材の前記凸条部の上面が平坦であることを特徴とする請求項１に記載の樹脂材のレーザ溶着方法。 2. The laser welding method for a resin material according to claim 1 , wherein an upper surface of the ridge portion of the first resin material is flat. 前記押え治具の前記凹条溝部の幅と、前記第１の樹脂材の前記凸条部の幅とが、略同一である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溶着方法。 The width of the concave groove of the pressing jig, wherein a first width of the convex portion of the resin material, the laser of the resin material according to claim 1 or 2, characterized in that substantially the same Welding method. 前記押え治具の透過性材料が、ポリカーボネート（ＰＣ）か、ＰＣをコーティングした材料、又は強化ガラスであ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溶着方法。 4. The laser welding of a resin material according to claim 1 , wherein the transparent material of the holding jig is polycarbonate (PC), a material coated with PC, or tempered glass. Method.
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