JP2020075506A - 付加製造プロセスにおけるエラー検出及び熱放散に対する補償の方法 - Google Patents
付加製造プロセスにおけるエラー検出及び熱放散に対する補償の方法 Download PDFInfo
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Abstract
Description
RT=エネルギー源の焦点から流出する熱流に係わる熱抵抗、
RLi,n=ボクセルの熱抵抗、
m=熱抵抗が本質的に互いに直列である、レーザ焦点からの距離が増加するボクセルのインデックス層、
n=熱抵抗が本質的に互いに並列に作用する、レーザ焦点からほぼ等距離にある所与の層内の個別のボクセルのインデックス、である。
であり、ここで、RT=エネルギー源の焦点から流出する熱流に係わる熱抵抗、RLi,n=ボクセルの熱抵抗、m=熱抵抗が本質的に互いに直列である、レーザ焦点からの距離が増加するボクセルのインデックス層、n=熱抵抗が本質的に互いに並列に作用する、レーザの焦点からほぼ等距離にある所与の層内の各ボクセルのインデックス、である。
Claims (15)
- 粉末床付加製造プロセスを監視する方法(300)であって、
付加製造装置の粉末床に付加材料層を堆積することと、
前記付加材料層の一部を溶融するために、エネルギー源(120)からのエネルギーを前記付加材料層に選択的に指向させることと、
前記エネルギー源(120)から指向された前記エネルギーと、部品及び前記粉末床の熱伝導特性とに少なくとも部分的に基づいて予測放出信号を取得することと、
溶融プール監視システム(200)を用いて、前記粉末床からの放出信号を測定することと、
測定された前記放出信号と前記予測放出信号との差を判定することと、
前記差が所定のエラー閾値を超える場合にアラートを生成することと、
を含む、方法(300)。 - 前記熱伝導特性は、1つ以上の熱遅延特性又は熱抵抗特性を含む、請求項1に記載の方法(300)。
- 前記熱遅延特性は、前記エネルギー源(120)が第1の点(252)に指向されたときと、前記エネルギー源(120)が第2の点(254)に指向されたときとの間のタイムラグであって、前記第2の点(254)は前記第1の点(252)に隣接する、請求項2に記載の方法(300)。
- 前記第2の点(254)が、前記第1の点(252)から3次元空間内の指定距離内に位置している場合には、前記第2の点(254)は前記第1の点(252)に隣接する、請求項3に記載の方法(300)。
- 前記熱遅延特性は、前記エネルギー源(120)の焦点(174)において測定される放出データに関する後続のタイムスタンプと、前記後続のタイムスタンプにおける前記焦点(174)から指定距離内の領域(256)において測定される放出データに係わる以前のタイムスタンプとの間の時間差として計算される、請求項2〜請求項4のいずれか一項に記載の方法(300)。
- 前記熱遅延特性は、第1の付加層の第1の領域(256)の溶融と、後続の付加層の、前記第1の領域(256)の直上の第2の領域(256)の溶融との間の時間の大きさである、請求項2〜請求項5のいずれか一項に記載の方法(300)。
- 前記熱抵抗特性は、前記部品及び前記粉末床の3次元空間内の焦点(174)から指定距離内にある特定の領域(256)に対する熱エネルギー伝達率を含む、請求項2〜請求項6のいずれか一項に記載の方法(300)。
- 前記熱エネルギー伝達率は、
前記部品及び前記粉末床を、前記エネルギー源(120)の焦点(174)に隣接する3次元空間を充たす複数のボクセルに分割することと、
前記複数のボクセルのそれぞれの熱抵抗を推定することと、
前記複数のボクセルのそれぞれの熱抵抗を合計して熱伝達モデルを定式化することと、
によって取得される、請求項7に記載の方法(300)。 - 前記熱伝達モデルは、
であり、ここで、
RT=前記エネルギー源(120)の焦点(174)から流出する熱流に係わる熱抵抗、
RLi,n=ボクセルの熱抵抗、
m=熱抵抗が本質的に互いに直列である、レーザの前記焦点(174)からの距離が増加するボクセルのインデックス層、
n=熱抵抗が本質的に互いに並列に作用する、レーザの前記焦点(174)からほぼ等距離にある所与の層内の各ボクセルのインデックスである、請求項8に記載の方法(300)。 - 前記複数のボクセルは立方体ボクセルである、請求項8又は請求項9に記載の方法(300)。
- 前記複数のボクセル生成に、メッシュ生成アルゴリズムが使用される、請求項8〜請求項10のいずれか一項に記載の方法(300)。
- 前記熱伝導特性は、部品又は付加造形モデルの有限要素法を用いて決定される、請求項1〜請求項11のいずれか一項に記載の方法(300)。
- 前記熱伝導特性は熱伝達モデルに従って定義され、前記熱伝達モデルは、
複数の代表的プロセス造形物の熱伝導特性を含む、前記複数の代表的プロセス造形物のプロセスデータを取得することと、
前記プロセスデータの部分集合を選択することと、
前記プロセスデータの前記部分集合に基づいて前記熱伝達モデルをトレーニングすることと、
後続の造形プロセスのモデル予測を取得することと、
によって開発される、請求項1に記載の方法(300)。 - 付加製造装置であって、
前記付加製造装置の粉末床上に付加材料層を堆積させるための粉末(142)堆積システム(100)と、
前記付加材料層の一部を溶融するために、前記付加材料層にエネルギーを選択的に指向させるためのエネルギー源(120)と、
前記粉末床から放出される電磁エネルギーを測定するための溶融プール監視システム(200)と、
前記溶融プール監視システム(200)に動作可能に結合されたコントローラ(220)であって、
部品及び前記粉末床の熱伝導特性であって、一つ又は複数の熱遅延特性又は熱抵抗特性を含む熱伝導特性を取得し、
前記エネルギー源(120)から指向された前記エネルギーと、前記部品及び前記粉末床の前記熱伝導特性とに少なくとも部分的に基づいて予測放出信号を取得し、
前記溶融プール監視システム(200)を用いて、前記粉末床からの放出信号を測定し、
測定された前記放出信号と前記予測放出信号との差を決定し、
前記差が所定のエラー閾値を超える場合にアラートを生成する、
ように構成されたコントローラと、
を含む付加製造装置。 - 前記熱遅延特性は、前記エネルギー源(120)が第1の点(252)に指向されたときと、前記エネルギー源(120)が、前記第1の点(252)に隣接する第2の点(254)に指向されたときとの間のタイムラグである、請求項14に記載の付加製造装置。
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CN115533123B (zh) * | 2022-12-06 | 2023-03-28 | 西安赛隆增材技术股份有限公司 | 一种增材制造成形三维零件的方法 |
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KR102396959B1 (ko) * | 2021-05-31 | 2022-05-12 | 한국전자기술연구원 | 금속 3d 프린팅의 출력 안정화를 위한 열 빠짐 특성 분석 기반 모델 출력 방향 결정 방법 및 시스템 |
WO2022255717A1 (ko) * | 2021-05-31 | 2022-12-08 | 한국전자기술연구원 | 금속 3d 프린팅의 출력 안정화를 위한 열 빠짐 특성 분석 기반 모델 출력 방향 결정 방법 및 시스템 |
EP4144463A1 (en) * | 2021-09-01 | 2023-03-08 | General Electric Company | Apparatus, systems, and methods for monitoring, analyzing, and adjusting additive machine and build health and configuration |
WO2023113450A1 (ko) * | 2021-12-16 | 2023-06-22 | 한국전자기술연구원 | 3d 프린팅 열 배출 해석을 위한 서포트 싱크 적용 방법 |
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