JP7244529B2 - 金属粉末の状態を判定するための方法及び装置 - Google Patents
金属粉末の状態を判定するための方法及び装置 Download PDFInfo
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Description
・所定の範囲外にある色を有する粒子の数及び割合
・所定の範囲内にある画像要素の平均色
・全ての画像要素の平均色
金属粒子の色は、粒子が劣化するにつれて変化することは判明している。特に、粒子が酸化し及び/または熱に曝されると変化する。粒子が酸化するほど、あるいは曝される温度が高いほど、色の変化は大きくなる。従って色の変化の量は、粒子が受けた劣化の程度、よって再使用の適合性にも関連付けられる。
Claims (33)
- 積層造形プロセスで用いる金属粉末の状態の判定方法であって、前記金属粉末の色を測定するために、前記金属粉末の画像を処理するステップを含む判定方法。
- 前記金属粉末の前記画像を取得するステップを含む請求項1の判定方法。
- 前記画像は光学画像である請求項1または2に記載の判定方法。
- 前記画像をクロッピングするステップを含む請求項1乃至3のいずれか1項に記載の判定方法。
- 前記画像の品質をチェックするステップを含む請求項1乃至4のいずれか1項に記載の判定方法。
- 前記画像は複数の画像要素により形成され、または複数の画像要素に分割される請求項1乃至5のいずれか1項に記載の判定方法。
- 前記画像化した粉末中の粒子の数に対する前記画像中の画像要素の比は少なくとも100:1または1000:1である請求項6に記載の判定方法。
- 閾値未満の輝度を有する複数の画像要素を識別して後続の処理から除外する請求項6または7に記載の判定方法。
- 前記閾値の上下の画像要素の比を計算するステップを含む請求項8に記載の判定方法。
- 前記画像を処理して、それが表す粉末の粒子の総数を推定する請求項1乃至9のいずれか1項に記載の判定方法。
- 前記画像を処理して、選択された範囲の外にある画像化された粉末の表面特性を表す複数の画像要素を識別する請求項1乃至10のいずれか1項に記載の判定方法。
- 所定のサイズを超える識別された連結画像要素のグループが識別されて、それにより前記選択された範囲の外の表面特性を有する粉末の粒子を識別する請求項11に記載の判定方法。
- 前記選択された範囲の外の割合は、5%または1%である請求項12に記載の判定方法。
- 所定のサイズを超える識別された連結画像要素のグループが識別されて、それにより前記選択された範囲の外の表面特性を有する粉末の粒子を識別する請求項11乃至13のいずれか1項に記載の判定方法。
- 識別された粒子ごとに、各画像要素に関連する、前記粒子及び固有識別子を表すデータを格納するステップを含む請求項14に記載の判定方法。
- 選択された範囲の外の測定表面特性を有する前記画像中における粒子の数を判定するステップを含む請求項1乃至15のいずれか1項に記載の判定方法。
- 測定表面特性が前記選択された範囲の外にある測定された粉末の割合が所定の値を超えていた場合に、前記粉末は再使用に適していないことを示すステップを含む請求項11乃至16のいずれか1項に記載の判定方法。
- 前記測定表面特性が前記選択された範囲の内にある前記測定された粉末の粒子の平均測定表面特性を判定することを含む請求項11乃至17のいずれか1項に記載の判定方法。
- 前記選択された範囲内の測定表面特性の前記粉末の平均測定表面特性が、所定の閾値よりも大きいまたは小さい場合に、前記試験された粉末は再使用に適していないことを示すステップを含む請求項18に記載の判定方法。
- 前記画像を処理して個々の粒子を分析し、個々の粒子それぞれの前記表面特性を測定するステップを含む請求項1乃至19のいずれか1項に記載の判定方法。
- 包囲体内に前記粉末を配置して前記包囲体内の前記粉末を照らすステップを含む請求項1乃至20のいずれか1項に記載の判定方法。
- 請求項1乃至21のいずれか1項に記載の判定方法による積層造形プロセスにおいて使用する金属粉末の状態を判定する装置であって、前記装置は、前記金属粉末の色を測定するために、前記粉末の画像を処理するように構成されたプロセッサを含む装置。
- 前記粉末の画像を取得して前記プロセッサに送信するデバイスを含む請求項22に記載の装置。
- 前記粉末の画像を取得するための前記デバイスはカメラ、センサまたはスキャナである請求項23に記載の装置。
- 前記装置は、その中で前記画像が取得できる包囲体を画定する請求項23または24に記載の装置。
- 前記粉末を照らす1つまたは複数のランプを含む請求項22乃至25のいずれか1項に記載の装置。
- 前記包囲体は、前記粉末を照らす1つまたは複数のランプ以外の光源を実質的に遮断するように構成されている請求項25に従属する請求項26に記載の装置。
- 前記装置は、金属粉末の処理及び/または搬送のための装置中に含まれている請求項22乃至27のいずれか1項に記載の装置。
- 前記装置は、積層造形機の中に含まれている請求項22乃至28のいずれか1項に記載の装置。
- 前記装置の出力は、金属粉末の処理及び/または搬送のための前記装置、及び/または前記積層造形機械を制御するために使用される請求項28または29に記載の装置。
- 造形作業中に粉末を分析し、前記分析結果を保存するように構成された請求項30に記載の装置。
- 請求項1乃至22のいずれか1項に記載の判定方法を実行するように前記プロセッサが構成された請求項22乃至31のいずれか1項に記載の装置。
- 前記プロセッサはプログラムされたコンピュータである請求項22乃至32のいずれか1項に記載の装置。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1718815.2A GB2568313B (en) | 2017-11-14 | 2017-11-14 | Method and apparatus for determining powder condition |
GB1718815.2 | 2017-11-14 | ||
PCT/GB2018/053294 WO2019097222A1 (en) | 2017-11-14 | 2018-11-14 | Method and apparatus for determining metal powder condition |
Publications (3)
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GB2584083B (en) * | 2019-05-15 | 2023-09-20 | Lpw Technology Ltd | Method and apparatus for analysing metal powder |
GB2584820B (en) * | 2019-05-15 | 2024-01-24 | Lpw Technology Ltd | Method and apparatus for analysing metal powder |
JP7381267B2 (ja) * | 2019-09-18 | 2023-11-15 | ナブテスコ株式会社 | 金属付加製造用粉粒体、その製造方法、その選別装置、その選別方法、粉体の純度判定装置、粉体の純度判定方法、粉体の保管方法、粉体の保管容器、金属造形物の製造方法、および、金属造形物の製造装置 |
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JP7318825B2 (ja) * | 2020-11-04 | 2023-08-01 | 株式会社プロテリアル | 積層造形物の欠陥予測方法および積層造形物の製造方法 |
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US11865616B2 (en) * | 2021-06-03 | 2024-01-09 | Hewlett-Packard Development Company, L.P. | Decaking 3D printed parts |
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