JP4096894B2 - Laser welding method of resin material - Google Patents

Laser welding method of resin material Download PDF

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Publication number
JP4096894B2
JP4096894B2 JP2004064125A JP2004064125A JP4096894B2 JP 4096894 B2 JP4096894 B2 JP 4096894B2 JP 2004064125 A JP2004064125 A JP 2004064125A JP 2004064125 A JP2004064125 A JP 2004064125A JP 4096894 B2 JP4096894 B2 JP 4096894B2
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Japan
Prior art keywords
laser
welding
resin material
resin
irradiated
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JP2005246913A (en
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義也 五島
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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    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1635—Laser beams characterised by the way of heating the interface at least passing through one of the parts to be joined, i.e. laser transmission welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1654—Laser beams characterised by the way of heating the interface scanning at least one of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1664—Laser beams characterised by the way of heating the interface making use of several radiators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1664—Laser beams characterised by the way of heating the interface making use of several radiators
    • B29C65/1667—Laser beams characterised by the way of heating the interface making use of several radiators at the same time, i.e. 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1677—Laser beams making use of an absorber or impact modifier
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/23—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations
    • B29C66/232—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations said joint lines being multiple and parallel, i.e. the joint being formed by several parallel joint lines
    • 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
    • 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
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/347—General aspects dealing with the joint area or with the area to be joined using particular temperature distributions or gradients; using particular heat distributions or gradients
    • B29C66/3472—General aspects dealing with the joint area or with the area to be joined using particular temperature distributions or gradients; using particular heat distributions or gradients in the plane of the joint, e.g. along the joint line in the plane of the joint or perpendicular to the joint line in the plane of the joint
    • 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
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/65—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles with a relative motion between the article and the welding tool
    • 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
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/65—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles with a relative motion between the article and the welding tool
    • B29C66/652—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles with a relative motion between the article and the welding tool moving the welding tool around the fixed article
    • 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
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/828—Other pressure application arrangements
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/863—Robotised, e.g. mounted on a robot arm
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—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
    • B29C65/1687—Laser beams making use of light guides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—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
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/822—Transmission mechanisms
    • B29C66/8223—Worm or spindle mechanisms

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • Toxicology (AREA)
  • Robotics (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Laser Beam Processing (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からなり、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、その熱により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関する。   The present invention comprises a resin material that is transmissive to laser light and a resin material that is absorptive, and heats the absorbent resin material by irradiating the laser light through the transmissive resin material. The present invention relates to a laser welding method for a resin material in which both materials are welded by melting the material.

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、従来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 is known in which both are generated by generating heat and melting each other. Such a technique for welding a resin material using laser light is expected to contribute to the needs for downsizing, cost reduction, and high reliability of the product as well as lowering the price of the laser. Further, this laser welding method is considered to increase dramatically in the number of conventional applications since non-contact and three-dimensional processing is possible as compared with conventional methods.

従来の樹脂材の溶着方法は、図（ａ）、（ｂ）に示されるように、透過性樹脂材２２と吸収性樹脂材２１との接合部に単一光のレーザ光Ｌを逐次照射して溶着Ｍする方法か、或いは、特許文献１に示されるようにレーザ光を２方向又はそれ以上の多方向から接合部に集光されるように照射して溶着する方法が用いられている。   As shown in FIGS. 1A and 1B, a conventional resin material welding method sequentially irradiates a single laser beam L to a joint portion between a transparent resin material 22 and an absorbent resin material 21. A method of welding M, or a method of welding by irradiating a laser beam so as to be focused on the joint from two or more directions as shown in Patent Document 1 is used.

特開２００２−３３１５８８号公報JP 2002-331588 A

しかしながら、上記した従来技術のレーザ溶着方法では、溶融して流動性のある樹脂が溶着部以外にはみ出す（バリとなって出る）ことで、溶融内部の圧力が抜け、引け巣やボイド等の空隙が発生するという問題があった。この問題を回避するために、両樹脂材の継ぎ手形状で溶着部を閉空間とする方法も考えられるが、この場合は、部品精度の悪い成形材料で寸法精度を確保することが難しい。   However, in the above-described conventional laser welding method, the melted and fluid resin protrudes out of the welded portion (out of burrs), so that the pressure inside the melt is released and voids such as shrinkage nests and voids are generated. There was a problem that occurred. In order to avoid this problem, a method of confining the welded portion with the joint shape of both resin materials is also conceivable. However, in this case, it is difficult to ensure dimensional accuracy with a molding material with poor component accuracy.

本発明は、上記問題に鑑みてなされたもので、その目的は、引け巣、ボイド等の溶着欠陥部の発生を防止す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 an object of the present invention is to provide a resin material laser welding method capable of preventing the occurrence of weld defects such as shrinkage cavities and voids.

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、レーザ光に対して吸収性のある第１の樹脂材と、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、この接合部にレーザ光を照射して両樹脂材を溶着する該レーザ溶着方法であって、３つのレーザ光のそれぞれの焦点が略２等辺三角形を形成するように照射されていて、この略２等辺三角形の底辺側に位置する２つのレーザ光が、所定の間隔をあけて並行に走る２本の溶着線上をそれぞれ走査することによって両樹脂材を予備溶着し、次いでこの２本の溶着線の略中間を、略２等辺三角形の頂角に位置する他の１つのレーザ光が走査することによって両樹脂材を本溶着するものであり、これにより、予備溶着によって溶着される２本の溶着線によって、両樹脂材の２つの溶着部間に閉空間が形成され、次いでこの閉空間を本溶着することで溶融内部の内圧が抜けることがないので、溶着部に引け巣、ボイド等の欠陥が発生することを防止できる。 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.
According to a laser welding method for a resin material according to claim 1, a first resin material that is absorptive to laser light and a second resin material that is transmissive to laser light are overlapped, A laser welding method in which a laser beam is irradiated to a joint portion to weld both resin materials, and the focal points of the three laser beams are irradiated so as to form a substantially isosceles triangle. Two laser beams located on the bottom side of the triangle scan the two welding lines running in parallel at a predetermined interval, thereby pre-welding both resin materials, and then an abbreviation of the two welding lines. The two resin materials are finally welded by scanning the middle with another laser beam located at the apex angle of the approximately isosceles triangle , and by this, the two welding lines welded by pre-welding , Closed between two welds of both resin materials During is formed, then since no pressure inside the melt comes out by the welding the closed space, it is possible to prevent the shrinkage cavity in the welding portion, defects such as voids generated.

請求項２の該レーザ溶着方法は、予備溶着の際の２つのレーザ光が本溶着の際の１つのレーザ光よりも先行するように３つのレーザ光の照射位置をずらして配置し、この３つのレーザ光を同時に照射するようにしたものである。即ち、予備溶着の２つのレーザ光から遅れて本溶着の光ビームが照射させるようにすることによって、一回の走査で予備溶着と本溶着とを行うことができ、作業時間を短縮できる。
請求項３の該レーザ溶着方法は、予備溶着の際のレーザ光と本溶着の際のレーザ光とでレーザ出力を変えるようにしたものであり、これにより、予備溶着の際はレーザ光の出力を小さくして、溶着幅を小さくすることもできる。 The laser welding method according to claim 2 is arranged by shifting the irradiation positions of the three laser beams so that the two laser beams in the preliminary welding precede the one laser beam in the main welding. Two laser beams are irradiated at the same time. That is, by irradiating the light beam of the main welding with a delay from the two laser beams of the pre-welding, the pre-welding and the main welding can be performed by one scan, and the working time can be shortened.
The laser welding method according to claim 3 is configured such that the laser output is changed between the laser beam at the time of preliminary welding and the laser beam at the time of main welding. It is also possible to reduce the welding width.

請求項４の該レーザ溶着方法は、予備溶着を行うに際して、治具等により両樹脂材に押圧力を加えるようにしたものであり、これにより、両樹脂材の密着性を向上できるので、予備溶着のレーザ光のレーザ出力を小さくすることができる。
請求項５の該レーザ溶着方法は、本溶着で両樹脂材に加えられる押圧力を解除するようにしたものであり、これにより、本溶着では例えば加圧のいらない治具を使用することもできるので、作業工程を簡素化できる。 The laser welding method according to claim 4 is a method in which a pressing force is applied to both resin materials with a jig or the like when performing preliminary welding, whereby the adhesion between both resin materials can be improved. The laser output of the welding laser beam can be reduced.
The laser welding method according to claim 5 is one in which the pressing force applied to both resin materials in the main welding is released, so that, for example, a jig that does not require pressurization can be used in the main welding. Therefore, the work process can be simplified.

以下、図面に従って本発明の実施の形態の樹脂材のレーザ溶着方法について説明する。図１は、レーザ溶着設備の概略の構成を示す全体構成図であり、図２は、レーザ溶着機の側面図である。レーザ溶着設備は、レーザ光Ｌをワーク２に対して照射するレーザ溶着機１と、ワーク２をセットする治具３と、治具３を保持するＸＹテーブル４等から構成されている。またレーザ溶着機１は、レーザ発生装置１１、光ファイバ１２及びレーザ光Ｌの出射光学系である光学ヘッド１３等よりなる。この光学ヘッド１３は、図２に示すようにロボット１４によって把持されており、レーザ光Ｌの照射角度及び照射位置とがロボット１４を操作することによって変えられるようになっている。また、ワーク２がセットされる治具３はＸＹテーブル４に保持されており、ＸＹテーブル４をＸ軸方向又はＹ軸方向に移動することにより、ワーク２自体がＸ軸及びＹ軸方向に移動できるようになっている。なお、ＸＹテーブル４はＸＹ平面上で回転することもできる。したがって、レーザ光Ｌの走査は、光学ヘッド１３の移動によって行ってもよいし、又は、ワーク２側の移動によって行ってもよい。ＸＹテーブル４は、加工室５内に配設されている。   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 an overall configuration diagram showing a schematic configuration of laser welding equipment, and FIG. 2 is a side view of a laser welding machine. The laser welding equipment includes a laser welding machine 1 that irradiates the workpiece 2 with laser light L, a jig 3 that sets the workpiece 2, an XY table 4 that holds the jig 3, and the like. The laser welding machine 1 includes a laser generator 11, an optical fiber 12, an optical head 13 that is an optical system for emitting laser light L, and the like. The optical head 13 is held by a robot 14 as shown in FIG. 2, and the irradiation angle and irradiation position of the laser light L can be changed by operating the robot 14. The jig 3 on which the workpiece 2 is set is held on the XY table 4, and the workpiece 2 itself moves in the X-axis and Y-axis directions by moving the XY table 4 in the X-axis direction or the Y-axis direction. It can be done. The XY table 4 can also rotate on the XY plane. Therefore, the scanning of the laser beam L may be performed by moving the optical head 13 or may be performed by moving the work 2 side. The XY table 4 is disposed in the processing chamber 5.

ワーク２がセットされる治具３は、下治具３１、押え治具３２及び押えボルト３３等からなっており、ワーク２は下治具３１及び押え治具３２間に加圧挟持される形でセットされる。ワーク２を挟持する加圧力は、押えボルト３３によって調整可能である。なお、押え治具３２には、照射されるレーザ光Ｌを通すための開口が形成されている。   The jig 3 on which the workpiece 2 is set includes a lower jig 31, a holding jig 32, a holding bolt 33, and the like. The workpiece 2 is pressed and clamped between the lower jig 31 and the holding jig 32. Set by. The pressing force for clamping the workpiece 2 can be adjusted by a presser bolt 33. The holding jig 32 has an opening for passing the irradiated laser beam L.

ワーク２は、重ね合わせ溶着の場合は、レーザ光Ｌを吸収する第１の樹脂材２１とレーザ光Ｌを透過する第２の樹脂材２２とからなり、レーザ溶着を行うにあたっては、これらの第１の樹脂材２１と第２の樹脂材２２とが、レーザ光Ｌを照射する側に第２の樹脂材２２がくるように治具３によって重ね合わされてセットされ、両樹脂材２１，２２の接合部である溶着線Ｍに沿ってレーザ溶着される。この接合部の密着性を良くするために、両樹脂材２１，２２は治具３によって押圧挟持される。   The workpiece 2 includes a first resin material 21 that absorbs the laser light L and a second resin material 22 that transmits the laser light L in the case of superposition welding. The first resin material 21 and the second resin material 22 are set by being overlapped by the jig 3 so that the second resin material 22 comes to the side irradiated with the laser beam L. Laser welding is performed along a welding line M which is a joint. In order to improve the adhesion of the joint, both resin materials 21 and 22 are pressed and clamped by the jig 3.

レーザ光Ｌを吸収する第１の樹脂材２１の種類としては、熱可塑性を有し、レーザ光Ｌを透過せずに吸収し得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Ｌを透過する第２の樹脂材２２の種類としては、熱可塑性を有し、レーザ光Ｌ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２１，２２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 21 that absorbs the laser light L is not particularly limited as long as it has thermoplasticity and can absorb the laser light L without transmitting. 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 22 that transmits the laser light L is not particularly limited as long as it has thermoplasticity and has a transmittance greater than or equal to the predetermined value with respect to the laser light L. Basically, the resin materials exemplified above can be used. Further, a colorant may be mixed as long as the transparency can be secured.
In addition, you may add reinforcement fibers, such as glass fiber and a carbon fiber, to the 1st and 2nd resin materials 21 and 22 as needed.

また、レーザ光Ｌに対して吸収性のある第１の樹脂材２１とレーザ光Ｌに対して透過性のある第２の樹脂材２２と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。   Moreover, about the combination of the 1st resin material 21 which is absorptive with respect to the laser beam L, and the 2nd resin material 22 which is permeable with respect to the laser beam L, it is a combination of mutually compatible things Is preferred. 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Ｌの種類としては、レーザ光Ｌ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。   As the type of the laser beam L used as the heating source, the transmittance in the transmissive resin becomes a predetermined value or more due to the absorption spectrum, plate thickness (transmission length), etc. of the transmissive resin that transmits the laser beam L. Those having such wavelengths are 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.

図３は、本発明の実施の形態のレーザ溶着方法を説明する図であり、図４は、（ａ）予備溶着と（ｂ）本溶着を説明する図である。従来技術においては、図６（ａ）に示されるように、光学ヘッド１３から１つのレーザ光Ｌが照射されるようになっていたが、本発明では、光学ヘッド１３から３つのレーザ光Ｌ1，Ｌ2，Ｌ3が照射されるようになっており、これら３つのレーザ光Ｌ1，Ｌ2，Ｌ3のそれぞれの焦点が略２等辺三角形を形成するように照射される。この略２等辺三角形の底辺側に位置する２つのレーザ光Ｌ1，Ｌ2によって、図４（ａ）に示されるような予備溶着が行われ、頂角に位置するレーザ光Ｌ3によって、図４（ｂ）に示されるような本溶着が行われる。そのためレーザ光Ｌ1，Ｌ2は、レーザ光Ｌ3よりも先行した位置にある。 FIG. 3 is a diagram for explaining a laser welding method according to an embodiment of the present invention, and FIG. 4 is a diagram for explaining (a) preliminary welding and (b) main welding. In the prior art, as shown in FIG. 6A, one laser beam L is emitted from the optical head 13, but in the present invention, three laser beams L 1 are emitted from the optical head 13. , L 2 , L 3 are irradiated, and the focal points of these three laser beams L 1 , L 2 , L 3 are irradiated so as to form a substantially isosceles triangle. Preliminary welding as shown in FIG. 4A is performed by the two laser beams L 1 and L 2 positioned on the bottom side of the approximately isosceles triangle, and the laser beam L 3 positioned at the apex angle is used to perform the preliminary welding as shown in FIG. The main welding as shown in 4 (b) is performed. Therefore, the laser beams L 1 and L 2 are in positions preceding the laser beam L 3 .

第１の樹脂材２１と第２の樹脂材２２とが重ね合わされたワーク２が、治具（図示せず）等により加圧されＸＹテーブル４上にセットされ、Ｘ軸方向移動機構４１及びＹ軸方向移動機構４２等を適宜操作することにより、レーザ発生装置１１で発生し、光ファイバ１２を経て光学ヘッド１３から照射されるレーザ光Ｌ1，Ｌ2，Ｌ3の走査が、それぞれの溶着線Ｍ1，Ｍ2，Ｍ3に沿って行われる。このようにして、先行するレーザ光Ｌ1，Ｌ2によって図４（ａ）に示される予備の溶着部（溶着線）Ｍ1，Ｍ2が形成される予備溶着が行われ、次いで後行するレーザ光Ｌ3によって図４（ｂ）に示されるように予備の溶着部Ｍ1，Ｍ2間に本溶着部Ｍ3が形成される本溶着が行われる。この場合、予備の溶着部Ｍ1，Ｍ2が固化した後に本溶着のレーザ光Ｌ3が照射されるように光学ヘッド１３がレイアウトされている。このようにして、ワーク２の溶着を完了する。 The workpiece 2 in which the first resin material 21 and the second resin material 22 are overlapped is pressed by a jig (not shown) or the like and set on the XY table 4, and the X-axis direction moving mechanism 41 and Y By appropriately operating the axial movement mechanism 42 and the like, scanning of the laser beams L 1 , L 2 , and L 3 generated by the laser generator 11 and irradiated from the optical head 13 through the optical fiber 12 is welded. This is done along the lines M 1 , M 2 , M 3 . In this way, preliminary welding in which preliminary welding portions (welding lines) M 1 and M 2 shown in FIG. 4A are formed by the preceding laser beams L 1 and L 2 is performed, and then followed. As shown in FIG. 4B, the laser beam L 3 is used to perform the main welding in which the main welding portion M 3 is formed between the preliminary welding portions M 1 and M 2 . In this case, the optical head 13 is laid out so that the laser beam L 3 of the main welding is irradiated after the preliminary welding parts M 1 and M 2 are solidified. In this way, the welding of the workpiece 2 is completed.

上記の説明においては、１つの光学ヘッド１３から３つのレーザ光Ｌ1，Ｌ2，Ｌ3が同時に照射される場合について説明しているが、３つのレーザ光Ｌ1，Ｌ2，Ｌ3がそれぞれ別の光学ヘッドから時間差をおいて照射されるようにしてもよいし、或いは予備溶着のレーザ光Ｌ1，Ｌ2と本溶着のレーザ光Ｌ3とを別の光学ヘッドから時間差をおいて照射されるようにしてもよい。更には、１つのレーザ光を利用して、溶着線Ｍ1，Ｍ2，Ｍ3を順番に走査するようにしてもよい。要は、本発明のレーザ溶着方法は、先ず所定の間隔をあけて予備の溶着部Ｍ1，Ｍ2を形成し、その後で予備の溶着部Ｍ1，Ｍ2間で本溶着を行うようにすることである。 In the above description, the case where the three laser beams L 1 , L 2 , and L 3 are simultaneously irradiated from one optical head 13 is described, but the three laser beams L 1 , L 2 , and L 3 are Each of the optical heads may be irradiated with a time difference, or the pre-welding laser beams L 1 and L 2 and the main welding laser beam L 3 may be irradiated with a time difference from another optical head. You may make it irradiate. Furthermore, the welding lines M 1 , M 2 , and M 3 may be sequentially scanned using one laser beam. In short, in the laser welding method of the present invention, the preliminary welding portions M 1 and M 2 are first formed at a predetermined interval, and then the main welding is performed between the preliminary welding portions M 1 and M 2. It is to be.

図５は、レーザ分光方法を説明する図であり、（ａ）はスプリッタを、（ｂ）は回折光学部品を使用した場合を示している。図５（ａ）では、ビームスプリッタ１５と折り返しミラー１６とをビームの移送系に設けることによって、レーザ発生装置１１から送られてくるビーム光を分光している。即ち、レーザ発生装置１１から送り出されるビーム光Ｌは、ビームスプリッタ１５で第１ビーム光Ｌ1と第２ビーム光Ｌ2とに分光され、第１ビーム光Ｌ1はビームスプリッタ１５をそのまま通過して光ファイバ１２によって出射光学系である第１光学ヘッド１３Ａから照射され、ビームスプリッタ１５で分光された第２ビーム光Ｌ2は折り返しミラー１６によって反射され、光ファイバ１２によって出射光学系である第２光学ヘッド１３Ｂから照射される。
図５（ｂ）は、レーザ光Ｌを回折光学系である回折光学部品１７によって３つのレーザ光Ｌ1，Ｌ2，Ｌ3に分光し、集光レンズ１８を介して分光されたレーザ光をそれぞれ照射するようにしている。
なお、レーザ光の分光方法に関しては、適宜他の公知の方法も採用可能である。 FIGS. 5A and 5B are diagrams for explaining a laser spectroscopic method. FIG. 5A shows a case where a splitter is used, and FIG. 5B shows a case where a diffractive optical component is used. In FIG. 5A, a beam splitter 15 and a folding mirror 16 are provided in a beam transfer system, thereby splitting the beam light transmitted from the laser generator 11. That is, the beam light L sent out from the laser generator 11 is split into the first beam light L 1 and the second beam light L 2 by the beam splitter 15, and the first beam light L 1 passes through the beam splitter 15 as it is. The second beam light L 2 irradiated from the first optical head 13 A, which is the emission optical system, and dispersed by the beam splitter 15 is reflected by the folding mirror 16 and is reflected by the optical fiber 12. 2 Irradiated from the optical head 13B.
In FIG. 5B, the laser beam L is split into three laser beams L 1 , L 2 , and L 3 by the diffractive optical component 17 that is a diffractive optical system, and the laser beam split through the condenser lens 18 is split. Each is irradiated.
As for the laser beam spectroscopic method, other known methods can be adopted as appropriate.

本発明のレーザ溶着方法によれば、樹脂材同志をレーザ光により溶着させることができ、樹脂の損傷もないため、例えばインストルメントパネル等の自動車部品、電池ケース等の電気・電子部品を製造するのに好適である。   According to the laser welding method of the present invention, resin materials can be welded by laser light, and there is no damage to the resin. For example, automobile parts such as instrument panels and electrical / electronic parts such as battery cases are manufactured. It is suitable for.

以上説明したように、本発明のレーザ溶着方法においては、まず所定の間隔をあけた２本の溶着線に沿って２つのレーザ光を同時又は別々に照射することによって予備溶着を行い、その後に予備の溶着部間をレーザ光を走査させることによって本溶着を行っているので、本溶着の際には、予備の２つの溶着部が壁となり閉空間を形成するので、圧力が抜けることがなく、本溶着部における引け巣、ボイド等の発生による欠陥部の形成が防止できる。   As described above, in the laser welding method of the present invention, first, preliminary welding is performed by simultaneously or separately irradiating two laser beams along two welding lines spaced apart by a predetermined distance. Since the main welding is performed by scanning a laser beam between the spare welding parts, the two welding parts serve as walls to form a closed space during the main welding, so that the pressure is not released. In addition, it is possible to prevent the formation of a defective portion due to the occurrence of shrinkage cavities, voids, and the like in the main welding portion.

レーザ溶着設備の概略の全体構成を示す図である。It is a figure showing the general whole composition of laser welding equipment. レーザ溶着機の側面図である。It is a side view of a laser welding machine. 本発明の実施の形態のレーザ溶着方法について説明する図である。It is a figure explaining the laser welding method of embodiment of this invention. （ａ）は予備溶着を説明する図であり、（ｂ）は本溶着を説明する図である。(A) is a figure explaining preliminary welding, (b) is a figure explaining this welding. レーザ光の分光方法（ａ），（ｂ）を説明する図である。It is a figure explaining the spectroscopy method (a), (b) of a laser beam. 従来技術のレーザ溶着方法を示す図である。It is a figure which shows the laser welding method of a prior art.

符号の説明Explanation of symbols

１…レーザ溶着機
１１…レーザ発生装置
１３，１３Ａ，１３Ｂ…光学ヘッド
２…ワーク
２１…第１の樹脂材
２２…第２の樹脂材
３…治具
４…ＸＹテーブル
Ｌ，Ｌ1，Ｌ2，Ｌ3…レーザ光
Ｍ，Ｍ1，Ｍ2，Ｍ3…溶着線（溶着部） 1 ... laser welding machine 11 ... laser generator 13, 13A, 13B ... optical head 2 ... workpiece 21 ... first resin member 22: second resin material 3 ... jig 4 ... XY table L, L 1, L 2 , L 3 ... laser beams M, M 1 , M 2 , M 3 ... welding lines (welding portions)

Claims (5)

レーザ光に対して吸収性のある第１の樹脂材と、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、この接合部にレーザ光を前記第２の樹脂材を通して照射し、前記接合部を溶融して両樹脂材を溶着する樹脂材のレーザ溶着方法において、
３つのレーザ光のそれぞれの焦点が略２等辺三角形を形成するように照射されるものであって、この略２等辺三角形の底辺側に位置する２つのレーザ光が、所定の間隔をあけて並行して走る２本の溶着線上をそれぞれ走査することによって前記第１の樹脂材と前記第２の樹脂材とを予備溶着し、次いで前記２本の溶着線の略中間を、前記略２等辺三角形の頂角に位置する、他の１つのレーザ光が走査することによって前記両樹脂材を本溶着することを特徴とする樹脂材のレーザ溶着方法。 A first resin material that absorbs laser light and a second resin material that is transparent to laser light are overlapped, and laser light is irradiated to the joint portion through the second resin material. In the laser welding method of the resin material for melting the joint portion and welding both resin materials,
The focal points of the three laser beams are irradiated so as to form a substantially isosceles triangle, and the two laser beams located on the bottom side of the approximately isosceles triangle are parallel to each other at a predetermined interval. The first resin material and the second resin material are preliminarily welded by scanning each of the two welding lines that run in the same manner , and then the substantially isosceles triangle is formed approximately in the middle of the two welding lines. A method for laser welding of resin materials, characterized in that the two resin materials are finally welded by scanning with another laser beam located at the apex angle of the resin material. 前記予備溶着の際の２つのレーザ光が、前記本溶着の際の１つのレーザ光よりも先行するように３つのレーザ光の照射位置をずらして配置し、該３つのレーザ光を同時に照射す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。   The three laser light irradiation positions are shifted so that the two laser lights in the preliminary welding precede the one laser light in the main welding, and the three laser lights are irradiated simultaneously. The method for laser welding a resin material according to claim 1. 前記予備溶着の際のレーザ光と前記本溶着の際のレーザ光とで、レーザ出力を変え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。   3. The laser welding method for a resin material according to claim 1, wherein the laser output is changed between the laser beam for the preliminary welding and the laser beam for the main welding. 前記予備溶着を行うに際し、治具等により前記両樹脂材に押圧力を加えることを特徴とする請求項１，２又は３に記載の樹脂材のレーザ溶着方法。   4. The laser welding method for a resin material according to claim 1, wherein a pressing force is applied to both the resin materials by a jig or the like when performing the preliminary welding. 前記本溶着では、前記両樹脂材に加えられる押圧力を解除することを特徴とする請求項１，２又は３に記載の樹脂材のレーザ溶着方法。   4. The laser welding method for a resin material according to claim 1, 2, or 3, wherein the pressing force applied to both the resin materials is released in the main welding.
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