JP6797642B2 - 原料粉体の処理方法、および三次元造形物の製造方法 - Google Patents
原料粉体の処理方法、および三次元造形物の製造方法 Download PDFInfo
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Description
溶融炉で製造された金属インゴットから製作された切削加工品の密度は通常99.9%以上である。これに対して、従来の粉末床溶融結合技術によって製造された金属の造形物は、造形密度が最大でも99.7%であって、従来の粉末床溶融結合技術において、金属インゴットから製作された切削加工品に匹敵する高密度な造形物は得られなかった。このため、成形金型のように高い表面品質が要求される用途の場合、従来の粉末床溶融結合技術による造形物は、表面が粗いため、そのまま使用することは難しかった。
(造形物製造装置)
図1は実施の形態1の造形物製造装置の構成の説明図である。図2は造形容器の構成の説明図である。図1に示すように、造形物製造装置100は、粉末床溶融結合方式のいわゆる3Dプリンタである。
原料粉体の内部が金属であっても、その表面は酸化膜等の不導体膜で覆われているため、通常は原料粉体粒子間の導電性が低い。このため、原料粉体をプラズマ放電に晒してプラズマ処理するためには、薄層104と対向する位置に平板電極を配置し、平板電極に交流電圧を印加することが必要と考えられていた。しかし、薄層104の上空に平板電極を設けると、薄層104にレーザービームを照射するための光路を妨げ、造形容器107の上面に沿って移動する薄層形成機構105に衝突する。このため、薄層104の上空に平板電極を設ける場合、平板電極を薄層104の上空位置から物理的に退避させる退避機構が必要と考えられていた。
図1に示すように、造形物製造装置100は、造形容器107に形成された原料粉体の薄層104に交流電圧を印加して薄層104の隣接空間にプラズマを発生させる。造形物製造装置100は、最初の層として積層基材112上に形成された薄層104をプラズマ処理し、2層目以降の薄層として処理済薄層104’上に積層された薄層104をプラズマ処理する。
図1に示すように、走査加熱機構106は、集光レンズやコリメータレンズ等の光学素子を適宜含む。光源110は、YAGレーザー発振器であって、出力500Wである。走査加熱機構106は、光源110で発生させたレーザービームをガルバノミラー106mで走査することにより、処理済薄層104’の固形化領域を、レーザービームLBのビームスポットで加熱する。
図3は造形物の製造プロセスのフローチャートであって、図4は造形物製造装置における積層プロセスの説明図である。図4中、(a)は下降工程、(b)は形成工程、(c)はプラズマ処理工程、(d)はビーム成形工程、(d)は下降工程、(e)は形成工程である。図1に示すように、制御部200は、CPU205、RAM206、ROM207を有する。CPU205は、ROM207から呼び出したプロセスの制御プログラムおよび各種データをRAM206に保持して、必要な演算と制御とを実行することで、造形物製造装置100のプロセスコントローラとして機能する。ユーザーが操作部201を通じてプロセス開始を指令すると、CPU205は、造形物製造装置100の各ユニットを統括的に制御して雰囲気生成工程を実行する。そして、CPU205は、形成工程、酸化膜を除去する工程、およびビーム成形工程のサイクルを繰り返すことにより造形物を製造する。
以上説明した造形物製造装置100を使用して、以下の実施例1、2、3のように原料粉体の材料とプラズマ処理条件とレーザービーム加熱成形処理条件を異ならせて造形物301を製造し、成形された造形物301の密度を確認した。
実施例1では、以下の条件で、ステンレスの原料粉体のプラズマ処理/レーザービーム加熱成形処理を行った。
容器101内の圧力:6.66kPa
供給気体:アルゴンガス
原料粉体:水アトマイズ法による粒径7μmのSUS613原料粉体
薄層104の層厚:20μm
印加電圧:交流電圧1kV、周波数100kHz
処理時間:1分
溶融領域:薄層104上の幅及び奥行25mmの正方形領域
積層回数:5000回
積層高さ:100mm
実施例2では、以下の条件で、チタン原料粉体のプラズマ処理/レーザービーム加熱成形処理を行った。
容器101内の圧力:13.3Pa
供給気体:アルゴンガス50%+水素ガス50%の混合気体(分子数比%)
原料粉体:水アトマイズ法による粒径50μmのTi原料粉体
薄層104の層厚:100μm
印加電圧:交流電圧20kV、周波数7kHz
処理時間:3分
溶融領域:薄層104上の幅及び奥行25mmの正方形領域
積層回数:500回
積層高さ:50mm
実施例3では、以下の条件で、アルミニウム原料粉体のプラズマ処理/レーザービーム加熱成形処理を行った。
容器101内の圧力:1.0kPa
供給気体:水素ガス100%
原料粉体:ガスアトマイズ法による粒径80μmのAl原料粉体
薄層104の層厚:100μm
印加電圧:交流電圧1.5kV、周波数100kHz
処理時間:3分
溶融領域:薄層104上の幅及び奥行5mmの正方形領域
積層回数:50回
積層高さ:5mm
実施の形態1では、酸素を減少させた雰囲気中で薄層104の原料粉体をプラズマ処理するので、酸素によって原料粉体が酸化して不導体膜を形成する反応を回避できる。また、アルゴンを含む雰囲気中で薄層104の原料粉体をプラズマ処理するので、アルゴンイオンと電子の衝突によって原料粉体の表面に付着した異物を除去し、加熱して結晶性の高い表面を形成することができる。さらに、水素を含む雰囲気中で薄層104の原料粉体をプラズマ処理するので、水素によって原料粉体の表面の酸化膜を還元して不導体膜を解消する反応が促進される。このため、粉末床溶融結合技術における造形密度の問題点を解消し、例えば造形密度99.9%以上の従来よりも高密度で表面性に優れ高強度な造形物を造形可能となる。
実施の形態1では、いわゆるゾーンメルト法によって単結晶を成長させた場合と同様に、下層の結晶核に連続して上層の結晶がそれぞれ成長することを繰り返して造形物301が製造される。このため、造形物301は、原料粉体の薄層104がプラズマ処理された処理済薄層104’をレーザービームLBにより溶融して固形化させた第1層側の面から最終層側の面に向かって結晶が並列に成長した結晶組織を有する。すなわち、造形物製造装置100により造形された造形物は、原料粉体の層の積層方向に向かって結晶が成長した結晶組織を有する。そして、造形物は、アルキメデス法で測定した造形密度が99.9%以上であり、また、造形物301の表面だけでなく内部まで酸化物や異物が除去されている。
実施の形態1では合金(ステンレス)及び純金属(チタン)の造形物を製造する実施例を説明した。これに対して、実施の形態2では、図1に示す造形物製造装置100を用いて、窒化合金(ステンレス)及び炭化金属(シリコン)の造形物を製造する実施例を説明する。
図1に示すように、造形物製造装置100においてプラズマ処理を行う過程で、ガス供給機構102から窒素を含む物質を供給すると、プラズマ中で発生する窒素イオンが原料粉体に取り込まれるプラズマ窒化反応が進行する。プラズマ中で加熱され、クリーニングされ、活性化された原料粉体の表面から内部へ、プラズマ中で加速された窒素イオンが侵入し拡散する。
容器101内の圧力:13.3kPa
供給気体:ガス混合比1:1の窒素ガスと水素ガスの混合気体
原料粉体:水アトマイズ法による粒径7μmのステンレス粒子(SUS613)
薄層104の層厚:20μm
電圧条件:交流電圧1kV、周波数100kHz
処理時間:3分
溶融領域:処理済薄層(窒化薄層)上の幅及び奥行25mmの正方形領域
積層回数:2000回
造形物301の高さ:40mm
図1に示す造形物製造装置100においてプラズマ処理を行う過程で、ガス供給機構102から炭素を含む物質を供給すると、プラズマ中で発生する炭素イオンが原料粉体に取り込まれるプラズマ炭化反応が進行した。プラズマ中で加熱され、クリーニングされ、活性化された原料粉体の表面から内部へ、プラズマ中で加速された炭素イオンが侵入し拡散した。
容器内の圧力 :13.3kPa
供給気体:ガス混合比1:2:1のメタンガスと水素ガスとアルゴンガスの混合気体
原料粉体:水アトマイズ法による粒径5μmのシリコン原料粉体
薄層の層厚 :40μm
印加電圧 :交流電圧20kV、周波数100kHz
1層の処理時間 :5分
溶融領域:処理済薄層(炭化薄層)上の幅及び奥行25mmの正方形領域
積層回数:100回
積層高さ:4mm
実施の形態1ではレーザービーム加熱成形処理により処理済薄層を溶融して固形化した。これに対して実施の形態3では電子ビーム加熱成形処理により処理済薄層を溶融して固形化する。
図5は実施の形態3の造形物製造装置の構成の説明図である。図5に示す実施の形態3の造形物製造装置は、処理済薄層の加熱成形処理においてレーザービームに替えて電子ビームを使用する以外は実施の形態1の造形物製造装置と同様に構成され、同様にプラズマ処理/加熱成形処理のプロセスを実行する。したがって、図5中、実施の形態1と共通する構成には図1と同一の符号を付して重複する説明を省略する。
実施の形態3の造形物製造装置300は、容器101内の気体分子によって電子ビームが散乱されるため、電子ビーム加熱成形処理中は、容器101内の真空度を10−1Pa以下にする必要がある。そこで、実施の形態3の造形物製造装置300では、炭素ガスと水素ガスの混合気体を供給して真空度を100Paに保ってプラズマエッチング処理を行う。その後、混合気体の供給を停止し、真空度を10−1Paに回復させた状態で電子ビーム加熱成形処理を実行する。
本発明の原料粉体処理方法、造形物製造方法、原料粉体処理装置、及び造形物製造装置は、実施の形態1乃至3で説明した具体的な各部構成、部品形態、数値条件、及び制御には限定されない。実施の形態1乃至3の構成の一部又は全部を等価な部材に置き換えた別の実施の形態でも実施可能である。
Claims (12)
- 粉末床溶融技術を用いて三次元造形物を製造するための原料粉体の処理方法であって、
前記原料粉体の層を形成する形成工程と、
前記層を形成した前記原料粉体の表面に形成された酸化膜を除去する工程と、を有し、前記酸化膜を除去する工程が、水素および/または不活性元素を含む雰囲気中で、前記層に電極を接触させて交流電圧を印加し、プラズマを生成させることにより行われる、
ことを特徴とする原料粉体の処理方法。 - 前記形成工程は、減圧可能な容器内にて行われ、
前記形成工程よりも前に、前記容器内を第1の圧力に減圧した後に、前記容器内に不活性元素を供給して前記第1の圧力よりも高く大気圧未満である第2の圧力の雰囲気を生成する雰囲気生成工程を有する、
ことを特徴とする請求項1に記載の原料粉体の処理方法。 - 前記形成工程は、減圧可能な容器内にて行われ、
前記酸化膜を除去する工程は、前記容器内を大気圧未満に減圧した状態で実行される、
ことを特徴とする請求項1に記載の原料粉体の処理方法。 - 前記酸化膜を除去する工程は、前記容器内を10Pa以上10kPa未満の圧力に減圧した状態で実行される、
ことを特徴とする請求項3に記載の原料粉体の処理方法。 - 前記層は、前記容器から電気的に絶縁して前記容器内に配置された粉体容器に形成される、
ことを特徴とする請求項2乃至4のいずれか一項に記載の原料粉体の処理方法。 - 前記容器は、接地電位に接続されている、
ことを特徴とする請求項5に記載の原料粉体の処理方法。 - 前記酸化膜を除去する工程の後、前記層の上にさらに層を形成する、
ことを特徴とする請求項1乃至6のいずれか一項に記載の原料粉体の処理方法。 - 前記プラズマの発生は、ヒータ又はエネルギービームにより前記層を加熱している状態で実行される、
ことを特徴とする請求項1乃至7のいずれか一項に記載の原料粉体の処理方法。 - 前記原料粉体は、水アトマイズ法により形成された金属粒子である、
ことを特徴とする請求項1乃至8のいずれか一項に記載の原料粉体の処理方法。 - 原料粉体の層を形成する形成工程と、
前記層を形成する前記原料粉体の表面に形成された酸化膜を除去する工程と、
前記酸化膜が除去された原料粉体にエネルギービームを照射して固形化するビーム成形工程と、を繰り返し含み、
前記酸化膜を除去する工程が、水素および/または不活性元素を含む雰囲気中で、前記層に電極を接触させて交流電圧を印加し、プラズマを生成させることにより行われる、
ことを特徴とする三次元造形物の製造方法。 - 前記ビーム成形工程は、酸素を減少させた雰囲気中で実行される、
ことを特徴とする請求項10に記載の三次元造形物の製造方法。 - さらに、水アトマイズ法により前記原料粉体を形成する工程を含む、
ことを特徴とする請求項10または11に記載の三次元造形物の製造方法。
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US20150042017A1 (en) | 2013-08-06 | 2015-02-12 | Applied Materials, Inc. | Three-dimensional (3d) processing and printing with plasma sources |
WO2015065510A1 (en) * | 2013-10-28 | 2015-05-07 | 3D Forms, Inc. | Three dimensional object formation method |
JP2015151586A (ja) * | 2014-02-17 | 2015-08-24 | Ntn株式会社 | 焼結金属部品の製造方法 |
-
2016
- 2016-11-14 JP JP2016221433A patent/JP6797642B2/ja active Active
- 2016-11-24 EP EP16002509.4A patent/EP3178585A1/en not_active Withdrawn
- 2016-12-05 TW TW105140107A patent/TW201720549A/zh unknown
- 2016-12-08 KR KR1020160166429A patent/KR20170069155A/ko not_active Application Discontinuation
- 2016-12-08 US US15/373,216 patent/US10421156B2/en not_active Expired - Fee Related
- 2016-12-09 CN CN201611125067.3A patent/CN106862562B/zh active Active
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2019
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CN106862562A (zh) | 2017-06-20 |
US20200001399A1 (en) | 2020-01-02 |
CN106862562B (zh) | 2020-03-13 |
US10421156B2 (en) | 2019-09-24 |
KR20170069155A (ko) | 2017-06-20 |
TW201720549A (zh) | 2017-06-16 |
JP2017110294A (ja) | 2017-06-22 |
EP3178585A1 (en) | 2017-06-14 |
US20170165791A1 (en) | 2017-06-15 |
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