JP7408066B2 - ビルド面のグリッド領域における放射熱エネルギー密度の測定 - Google Patents
ビルド面のグリッド領域における放射熱エネルギー密度の測定 Download PDFInfo
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Description
本出願は、それぞれ「Systems And Methods For Measuring Energy Input During An Additive Manufacturing Operation」と題する、2017年8月1日に出願された米国仮特許出願第62/540,016号、2018年2月21日に出願された第62/633,487号、および2018年3月15日に出願された62/643,457号の優先権を主張し、その開示は、その全体があらゆる目的のために参照により本明細書に組み込まれる。
統合されたフォトダイオード電圧418を使用して、TEDi計算のpdoniを決定できる。
ここで、Vは各スキャンレットに対して決定された平均電圧、Nはサンプル数である。図6Dでは、20サンプルセグメントの平均電圧は、データの幅が固定されているため、信号の積分に相当する。
スキャンの開始と終了のx座標とy座標は指定され得るか、1つまたは複数の直接センサ測定値に基づいて決定され得る。
TEDは、レーザパワー、レーザ速度、ハッチ間隔など、ユーザ定義のすべてのレーザ粉末床融合プロセスパラメータに敏感である。TED値は、ベースラインデータセットとのIPQM比較を使用した分析に使用され得る。結果のIPQMは、レーザスキャンごとに決定され得、点群を使用してグラフまたは3次元で表示され得る。図4Gは、例示的なグラフを示している。図4Hは、例示的な点群を示している。
リコータアームショートフィードのTED分析
熱エネルギー密度とグローバルエネルギー密度
PTOTAL LASER POWER=POPTICAL LOSSES AT THE LASER+PABSORPTION BY CHAMBER GAS+PREFLECTION+PPARTICLE AND PLUME INTERACTIONS+PPOWER NEEDED TO SUSTAIN MELT POOL+PCONDUCTION LOSSES+PRADIATION LOSSES+PCONVECTION LOSSES+PVAPORIZATION LOSSES 式(13)
VVOLTAGE USED BY TED={PRADIATED-PVIEW FACTOR-POPTICAL LOSSES AT RADIATED WAVELENGTHS-PSENSOR LOSS FACTOR}*(SENSOR SCALING FACTOR)式(15)
GED=(BEAM POWER)/{(TRAVEL SPEED)*(HATCH SPACING)} 式(16)
Claims (20)
- ビルド面上に粉末金属の層を堆積させるステップと、
各ビルド面の少なくとも一部を複数のグリッド領域に分割するステップであって、各グリッド領域はそれぞれのグリッド面積を有する、ステップと、
前記粉末金属の層を融合させるためのエネルギー源を使用して、各グリッド領域にわたる複数のスキャンを生成するステップと、
各グリッド領域のための前記複数のスキャンのそれぞれが行われている間に、各グリッド領域から放射されたエネルギー量を決定するステップと、
各グリッド領域の熱エネルギー密度を決定するステップと、
各グリッド領域の前記熱エネルギー密度を基準値と比較し、潜在的に欠陥のあるグリッド領域を特定するステップと、
を含む、コンポーネントを製造するための付加製造方法。 - グラフィカル媒体を用いて潜在的に欠陥のあるグリッド領域を表すステップをさらに含む、請求項1に記載の方法。
- テキストベースの媒体を用いて潜在的に欠陥のあるグリッド領域を表すステップをさらに含む、請求項1に記載の方法。
- 前記エネルギー源がレーザであり、グリッド領域に潜在的な欠陥があると判定することに応答して、そのグリッド領域を修復するためにレーザの後続のスキャンを調整する、請求項1に記載の方法。
- 前記潜在的に欠陥のあるグリッド領域を特定するステップは、前記複数のグリッド領域の各グリッド領域を公称または非公称として分類するステップを含む、請求項1に記載の方法。
- 各非公称グリッド領域は、非公称閾値のセットに基づいて分類される、請求項5に記載の方法。
- ビルド面を複数のグリッド領域に分割するステップであって、前記グリッド領域の各々はそれぞれのグリッド面積を有する、ステップと、
前記ビルド面にわたるエネルギー源の複数のスキャンを生成するステップと、
前記複数のスキャン中に、各グリッド領域から放射されたエネルギーの総量を決定するステップと、
各グリッド領域から放射された前記エネルギーの総量と各グリッド領域のグリッド面積とに基づいて、前記複数のグリッド領域の各グリッド領域に関連する熱エネルギー密度を計算するステップと、
前記複数のグリッド領域の各グリッド領域について計算された前記熱エネルギー密度を基準エネルギー密度値と比較し、潜在的に欠陥のあるグリッド領域を特定するステップと、
を含む、付加製造方法。 - グラフィカル媒体を用いて潜在的に欠陥のあるグリッド領域を表すステップをさらに含む、請求項7に記載の方法。
- テキストベースの媒体を用いて潜在的に欠陥のあるグリッド領域を表すステップをさらに含む、請求項7に記載の方法。
- 前記エネルギー源がレーザであり、グリッド領域に潜在的な欠陥があると判定することに応答して、そのグリッド領域を修復するためにレーザの後続のスキャンを調整する、請求項7に記載の方法。
- 前記潜在的に欠陥のあるグリッド領域を特定するステップは、前記複数のグリッド領域の各グリッド領域を公称または非公称として分類するステップを含む、請求項7に記載の方法。
- 各非公称グリッド領域は、非公称閾値のセットに基づいてさらに分類される、請求項11に記載の方法。
- 各グリッド領域の前記熱エネルギー密度は、それぞれのグリッド領域から放射される前記エネルギーの総量をそのグリッド領域のグリッド面積で割ることによって決定される、請求項7に記載の方法。
- ビルド面上に粉末金属の層を堆積させるステップと、
前記ビルド面にわたる複数のスキャンを生成するために、エネルギー源を使用して前記粉末金属の層を融合させるステップと、
前記複数のスキャン中に、前記ビルド面から放射されるエネルギー量を測定するステップと、
放射されたエネルギー量と前記複数のスキャンによって横断された前記ビルド面の面積とに基づいて、前記ビルド面の熱エネルギー密度を決定するステップと、
前記熱エネルギー密度を基準熱エネルギー密度値と比較することにより、前記ビルド面に潜在的な欠陥があるかを判定するステップと、
を含む、コンポーネントを製造するための付加製造方法。 - 前記ビルド面を複数のグリッド領域に分割するステップであって、各グリッド領域がそれぞれのグリッド面積を有する、ステップをさらに含む、請求項14に記載の方法。
- 各グリッド領域の熱エネルギー密度を決定するステップと、決定された前記熱エネルギー密度を基準熱エネルギー密度と比較し、そのグリッド領域に潜在的な欠陥があるかを判定するステップをさらに含む、請求項15に記載の方法。
- グラフィカル媒体を用いて潜在的に欠陥のあるグリッド領域を表すステップをさらに含む、請求項14に記載の方法。
- テキストベースの媒体を用いて潜在的に欠陥のあるグリッド領域を表すステップをさらに含む、請求項14に記載の方法。
- 前記エネルギー源がレーザであり、ビルド面に潜在的な欠陥があると判定することに応答して、そのビルド面を修復するためにレーザの後続のスキャンを調整する、請求項14に記載の方法。
- 前記ビルド面の前記熱エネルギー密度は、前記ビルド面から放射される前記エネルギー量を前記複数のスキャンによって横断された前記ビルド面の面積で割ることによって決定される、請求項14に記載の方法。
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