JP2005342559A - 定量切断チップの製造方法及びこれを用いた金属球の製造方法 - Google Patents
定量切断チップの製造方法及びこれを用いた金属球の製造方法 Download PDFInfo
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Abstract
【解決手段】 本発明は、線径200μm以下の少なくとも2本の金属細線が撚り合わされた撚り線を、金属細線線径の3倍以下のあらかじめ定められた間隔で切断していく定量切断チップの製造方法であり、撚り線としての引張最大荷重0.2kgf以上が好ましく、金属細線の材質はCuが好適である。また、本発明の金属球の製造方法は、上述の方法によって得られた定量切断チップを流体中で加熱、好ましくは気体中でプラズマを熱源として加熱して、球状化する製造方法である。
【選択図】 図1
Description
本発明の目的は、品質およびコスト面を解決し、さらに高精度且つ生産性に優れる定量切断チップの製造方法およびこれを用いた金属球の製造方法を提供することである。
また、前記金属細線においては、Cuであることが好適である。
また、本発明においては、金属細線の線径が100μm以下の場合において、4本以上の金属細線の撚り線を用いることもできる。
また、本発明の金属球の製造方法においては、流体中での加熱は、熱プラズマを熱源とすることが好ましい。
金属細線が寄り合わされた、つまり所定のピッチで互いに巻回されてなる撚り線は、お互いに拘束しあい一体化されているため、単一の細線に比べて剛性を高くすることができる。この点は非常に重要で、剛性が低い場合に問題となる、切断精度の低下、切断不良または金属細線自体の破断という問題の発生を低減することができる。これにより、細線チップとして切断したときに個々の細線チップの体積バラツキを小さくすることができる。
加えて、細線を束ねる際に結束剤を用いる必要がないので、結束剤の除去工程が不要となり経済的であるといった利点も有している。
なお、本発明においては、線径200μm以下の金属細線と規定している。これは、線径200μmを越えると切断精度の低下、切断不良または金属細線自体の破断という問題が少なくなり、撚り線を使用する本発明を適用する効果が少ないためである。
なお、本発明においては、金属細線単体ではハンドリングがより困難となる細線単体の引張最大荷重0.1kgf以下の金属細線に適用することが好ましい。
なお、細線チップから製造される粒径の揃った金属球は、各種パッケージに用いることができるため、この点からもNi、Cu、Al、Au、Agを主体とした細線への適用が有用である。
本発明の金属球の製造方法としては、流体中での加熱する方法を採用する。上記の定量切断チップ金属球を流体中で加熱すると、チップが溶解し、表面張力で球状化することができる。流体中であれば、冶具等との接触がなく、汚染が発生しにくいとともに、表面張力により真球度の優れた金属球が得られるためである。
熱プラズマは、高温度場でかつ高い熱伝導率を持つことができる。そして、熱プラズマ中では、金属チップは瞬時に溶融されると同時に表面張力によって球状化するので、熱プラズマ中の約10ms程度という極短時間の加熱で金属球が得られる。
また、1000K以上の高融点金属を溶融球状化することができるという点でも有効である。
また、前記撚り線として芯線を有するものを用いても良い。金属細線を芯線に巻回されてなる撚り線は、その屈曲が抑制され、搬送時や切断時の撓みが少ないためにより切断不良が低減され好ましい。ただし、この場合は芯線と撚り線では切断形状に差が発生するため、切断チップの定量性は劣ることになる。
なお、本発明において撚り線において、細線を巻回するピッチを小さくすれば素材の剛性を高くすることができるが、一方ピッチを小さくすることは、細線が斜めに切断される傾向が大きくなりため、得られる細線チップの体積のバラツキが大きくなる傾向となる。そのため、切断対象となる金属細線の材質や硬さといった諸特性に応じて調整することが有効である。
また、この撚り線の引張最大荷重を測定したところ、0.3kgfであった。
この撚り線を図2で示す細線切断装置を用いて33μm間隔で切断し、1000個の定量切断チップを作製した。
得られた切断チップは、ねじれた形状であり、チップ単体では軽すぎて、正確に秤量できず、切断における定量性の評価をそのままでは行うことが出来なかった。そのため、得られたチップから本発明の好適な用途である金属球を製造し、得られた金属球で定量性を評価することとした。
得られた金属球は、真球状であるために、粒径バラツキは、金属球の体積および重量のバラツキに近似するものである。
得られた粒径分布を図3、測定結果を表1に示す。各金属球の粒径バラツキは標準偏差3μm以下である。この結果から、金属チップの重量のばらつきは、無酸素銅の密度を8.92g/cm2として標準偏差7.45 x 10−10gとなり極めて定量的な切断を実施することができたことを確認した。
なお、本実施例では、撚り線を連続的に切断することができ、装置が停止することは皆無であった。
また、この撚り線の引張最大荷重を測定したところ、0.2kgfであった。
実施例1と同様にして、その撚り線を35μm間隔で切断して細線チップを作製し、同様の条件で熱プラズマにより球状化を施し、小金属球を得た。
各チップから得られた金属球の粒度を測定し得られた粒径分布を図4、測定結果を表2に示す。粒径のバラツキは標準偏差3μm以下であって、定量的な切断を実施することができた。
また本実施例でも、撚り線を連続的に切断することができ、線材の強度不足による送線トラブルによって、装置が停止することは皆無であった。
Claims (6)
- 線径200μm以下の少なくとも2本の金属細線が撚り合わされた撚り線を、金属細線線径の3倍以下のあらかじめ定められた間隔で切断していくことを特徴とする定量切断チップの製造方法。
- 撚り線は、引張最大荷重0.2kgf以上であることを特徴とする請求項1に記載の定量切断チップの製造方法。
- 金属細線は、Cuであることを特徴する請求項1または2に記載の定量切断チップの製造方法。
- 線径100μm以下、かつ4本以上の金属細線が撚り合わされた撚り線を用いることを特徴とする請求項1ないし3のいずれかに記載の定量切断チップの製造方法。
- 請求項1ないし4のいずれかに記載の製造方法で得られた定量切断チップを流体中で加熱して球状化することを特徴とする金属球の製造方法。
- 流体中での加熱は、気体中でプラズマを熱源とすることを特徴とする金属球の製造方法。
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