JP4075821B2 - 樹脂材のレーザ溶着方法 - Google Patents
樹脂材のレーザ溶着方法 Download PDFInfo
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- JP4075821B2 JP4075821B2 JP2004046363A JP2004046363A JP4075821B2 JP 4075821 B2 JP4075821 B2 JP 4075821B2 JP 2004046363 A JP2004046363 A JP 2004046363A JP 2004046363 A JP2004046363 A JP 2004046363A JP 4075821 B2 JP4075821 B2 JP 4075821B2
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
- B29C66/112—Single lapped joints
- B29C66/1122—Single lap to lap joints, i.e. overlap joints
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- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/16—Laser beams
- B29C65/1629—Laser beams characterised by the way of heating the interface
- B29C65/1635—Laser beams characterised by the way of heating the interface at least passing through one of the parts to be joined, i.e. laser transmission welding
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- B29C65/16—Laser beams
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- B29C65/16—Laser beams
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- B29C65/1654—Laser beams characterised by the way of heating the interface scanning at least one of the parts to be joined
- B29C65/1658—Laser beams characterised by the way of heating the interface scanning at least one of the parts to be joined scanning once, e.g. contour laser welding
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- B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
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- B29C66/00—General aspects of processes or apparatus for joining preformed parts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C66/00—General aspects of processes or apparatus for joining preformed parts
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- B29C66/00—General aspects of processes or apparatus for joining preformed parts
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- B29C66/43—Joining a relatively small portion of the surface of said articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29C66/00—General aspects of processes or apparatus for joining preformed parts
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
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- B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
- B29C66/8126—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
- B29C66/81266—Optical properties, e.g. transparency, reflectivity
- B29C66/81267—Transparent to electromagnetic radiation, e.g. to visible light
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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
- B29C66/84—Specific machine types or machines suitable for specific applications
- B29C66/863—Robotised, e.g. mounted on a robot arm
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/16—Laser beams
- B29C65/1603—Laser beams characterised by the type of electromagnetic radiation
- B29C65/1606—Ultraviolet [UV] radiation, e.g. by ultraviolet excimer lasers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B—PERFORMING OPERATIONS; TRANSPORTING
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Description
従来の技術は、レーザ溶着部を気密接合させる方法として、全周レーザ走査、或いは加工テーブル走査を行い、更に溶着開始点をオーバーラップさせることでシール性を確保しているのが一般的である。しかしながら、この従来の技術では、溶着中に巻き込んだエア等の欠陥が溶着終端部で出やすくなっており、溶着終端部での強度低下及び気密不良等の重大な問題を抱える可能性がある。
しかしながら、この溶接方法は、金属溶接に関わるものであり、その課題も金属の高エネルギービームに特有の溶接終端部の過熱及び急熱急冷による溶接割れを防止することであって、本発明の低出力レーザによる樹脂の溶着特有の隙間による巻き込みボイドを低減するものではない。また、両技術は基本的に異なるものであり、技術としての互換性がないものである。
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て、レーザ光を照射することにより、両樹脂材を溶着する樹脂材のレーザ溶着方法であって、第1の樹脂材と第2の樹脂材との2次元又は3次元の閉鎖されたループ形状の溶着線に沿ってレーザ光を照射し、このループ形状の溶着線がオーバーラップ位置にきたときに、ループ形状の溶着線から外れてレーザ光を照射し、このループ形状の溶着線から分岐した終端部を成す溶着線を形成し、この終端部でレーザ光の照射を停止するようにしたものである。これによって、溶着中に巻き込んだエアやガス成分を溶着終端部に集めることができ、溶着線部分での溶着欠陥の発生を防止することができる。また、ループ状の溶着線によって囲まれた空間のシール性を確保できる。
請求項3の該レーザ溶着方法は、レーザ光に対して吸収性のある第1の樹脂材として、カーボンにより着色した樹脂材を特定したものである。黒色は、レーザ光の吸収に好適である。
レーザ光を透過する第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。
また、溶着線Lによる溶着形状は、2次元の閉鎖ループを形成する円形、矩形のみならず2次元の任意の形状とすることができ、更に3次元の閉鎖ループを形成する形状であってもよい。
レーザ光の走査する速度は、任意の速度を採用することができると共に、走査方法においても、レーザ光を照射する光学ヘッド13を走査するようにしてもよいし、或いはXYテーブル4を移動させて、溶着製品となるワーク2を移動させるようにしてもよい。
11…レーザ発生装置
13…光学ヘッド
2…ワーク
21…第1の樹脂材
21a…継手部
22…第2の樹脂材
3…治具
31…下治具
32…押え治具
4…XYテーブル
5…捨てうち用治具
L…溶着線
M…終端部
N…スタート部
Claims (4)
- 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て、レーザ光を照射することにより、両樹脂材を溶着する樹脂材のレーザ溶着方法において、
前記第1の樹脂材と前記第2の樹脂材との2次元又は3次元の閉鎖されたループ形状の溶着線上にレーザ光を照射し、前記ループ形状の溶着線がオーバーラップ位置にきたときに、前記ループ形状の溶着線から外れてレーザ光を照射し、前記ループ形状の溶着線から分岐した終端部を成す溶着線を形成し、前記終端部でレーザ光の照射を停止することを特徴とする樹脂材のレーザ溶着方法。 - 前記終端部が、予め設計された場所又は製品上影響のない場所に設けられ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。
- 前記第1の樹脂材がカーボンにより着色された材料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。
- レーザ光の走査が、レーザ光の光学ヘッドの駆動又は溶着製品を加工テーブルで駆動させることにより行われ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。
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