JP4096894B2 - 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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- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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Description
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。
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。
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。
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。
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。
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)
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。 - 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。
- 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。
- 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。
- 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。
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