JP4577103B2 - レーザ溶着良否判定方法及びその装置 - Google Patents
レーザ溶着良否判定方法及びその装置 Download PDFInfo
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- JP4577103B2 JP4577103B2 JP2005171359A JP2005171359A JP4577103B2 JP 4577103 B2 JP4577103 B2 JP 4577103B2 JP 2005171359 A JP2005171359 A JP 2005171359A JP 2005171359 A JP2005171359 A JP 2005171359A JP 4577103 B2 JP4577103 B2 JP 4577103B2
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- 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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Description
(1)溶着後にレーザ光を当てて透過側の樹脂材と吸収側の樹脂材の溶着部の有無を検出する方法(例えば、特許文献1参照)
(2)レーダ溶着中に温度センサによって溶着部の温度を検出する方法、或いは温度センサにより、溶着前後における溶着部近傍の温度差を求め、この温度差に基づいて良否判定を行う方法(例えば、特許文献2参照)
請求項1に記載のレーザ溶着良否判定方法は、レーザ光Lに対して透過性のある樹脂材4と吸収性のある樹脂材5とのレーザ溶着中に赤外線センサ2を用いて、溶着部3の発熱量を検出することによって、溶着部3の良否を判定するようにしていて、赤外線センサ2を透過性樹脂材4の発熱量を検出する第1の赤外線センサ2Aと溶着部3の発熱量を検出する第2の赤外線センサ2Bとより構成したものであり、これにより、エネルギ過不足による溶着不良及びエネルギ一定の場合における両樹脂材4,5間の隙間による溶着不良をモニタリングすることが可能となる。また、溶着時に投入エネルギに変動があったのか、両樹脂材間に隙間があったのか、又は投入エネルギの変動及び隙間があったのかをモニタリングすることが可能となる。
請求項5の該判定装置は、第1の赤外線センサ2Aが、透過性樹脂材の赤外線の透過率特性が最小となる波長λminにマッチし、第2の赤外線センサ2Bが透過性樹脂材の赤外線の透過率特性が最大となる波長λmaxにマッチしたものから選定されているもので、これにより、判定精度が向上できる。
レーザ光Lの透過率の高い透過性樹脂材4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。また所定の透過率を確保できれば着色材を混入してもよい。なお、本実施形態では、透過性樹脂材4については、レーザ光Lの透過率と赤外線センサ2における赤外線の透過特性の両者の透過率がよいものを選定することが必要である。
また、吸収性樹脂材5及び透過性樹脂材4には、必要に応じ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。
このようにして、第2実施形態では、溶着時に投入エネルギの変動があったのか、両樹脂材4,5間に隙間があったのか、もしくは投入エネルギの変動及び隙間が有ったのかどうかをモニタリングすることができる。
このようにして、第2実施形態では、投入エネルギの変動があっても溶着部3の溶着状態をモニタリングすることが可能である。
2,2A,2B 赤外線センサ
3 溶着部
4 透過性樹脂材
5 吸収性樹脂材
6,6A,6B センサアンプ
7 判定装置
Claims (5)
- レーザ光(L)に対して透過性のある樹脂材(4)と吸収性のある樹脂材(5)とのレーザ溶着による溶着部(3)の溶着状態を判定するレーザ溶着良否判定方法において、
レーザ溶着中に赤外線センサ(2)を用いて、溶着部(3)の発熱量を検出することによって、溶着部(3)の良否を判定していて、
前記赤外線センサ(2)が、前記透過性樹脂材(4)の発熱量を検出する第1の赤外線センサ(2A)と前記溶着部(3)の発熱量を検出する第2の赤外線センサ(2B)とよりなることを特徴とするレーザ溶着良否判定方法。 - 前記第1の赤外線センサ(2A)による出力が上下限規格範囲内に収まっていて、前記第2の赤外線センサ(2B)による出力が上限規格以下である場合には、前記溶着部(3)の判定を良とすることを特徴とする請求項1に記載のレーザ溶着良否判定方法。
- 前記第2の赤外線センサ(2B)による出力が上限規格以下でない場合は、エネルギ変動の有無が判断され、エネルギ変動が有る場合は、前記第2の赤外線センサ(2B)の出力にエネルギ変動分の補正を行った補正出力が、前記上限規格以下かどうかを判断することによって前記溶着部(3)の良否を判定を行うことを特徴とする請求項2に記載のレーザ溶着良否判定方法。
- レーザ光(L)に対して透過性のある樹脂材(4)と吸収性のある樹脂材(5)とを重ね合わせて、その接合部に前記透過性樹脂材側からレーザ光(L)を照射することにより形成される両樹脂材(4,5)の溶着部(3)の溶着状態を判定するレーザ溶着良否判定装置が、
レーザ溶着中において溶着部(3)の発熱量を検出する赤外線センサ(2)と、
検出された発熱量に基づいて溶着部の良否を判定する判定装置(7)と、
を具備していて、
前記赤外線センサ(2)が、前記透過性樹脂材(4)の発熱量を検出する第1の赤外線センサ(2A)と、前記溶着部(3)の発熱量を検出する第2の赤外線センサ(2B)とよりなることを特徴とするレーザ溶着良否判定装置。 - 前記第1の赤外線センサが、前記透過性樹脂材(4)の赤外線の透過率特性が最小となる波長λminに適合しているものから選定され、前記第2の赤外線センサが、前記透過性樹脂材(4)の赤外線の透過率特性が最大となるλmaxに適合しているものから選定されていることを特徴とする請求項4に記載のレーザ溶着良否判定装置。
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