大規模積層造形における応力への対処(Dealing with stress in large-scale additive manufacturing)

ad

2024-03-25 オークリッジ国立研究所(ORNL)

オークリッジ国立研究所の科学者たちは、3Dプリンティングによる大型金属部品の製造時に生じる残留応力による損傷を回避する方法を特定しました。大型金属構造物の製造に3Dプリンティングが活用される中、残留応力による亀裂の形成を理解し、サポート材料の追加によってこれを軽減することが重要であることが明らかになりました。これにより、航空宇宙、自動車、防衛などの高付加価値産業においてより信頼性の高い3Dプリントが可能になります。

<関連情報>

大規模Ti-6Al-4Vワイヤーアーク積層造形における残留応力蓄積 Residual stress accumulation in large-scale Ti-6Al-4V wire-arc additive manufacturing

Ritin Mathews, Jaydeep Karandikar, Christopher Tyler, Scott Smith
Procedia CIRP  Available online:1 February 2024
DOI:https://doi.org/10.1016/j.procir.2023.09.247

大規模積層造形における応力への対処(Dealing with stress in large-scale additive manufacturing)

Abstract

Large-scale additive manufacturing (AM) is of interest in the manufacturing industry to produce components of dimensions on the order of hundreds of millimeters to meters in scale. Wire-arc AM (WAAM) of Ti-6Al-4V (Ti64) is an attractive technique for large-scale AM in the aerospace industry, give the high strength-to-weight ratio of the material and high deposition rate of the process. However, due to the large scale, significant distortion and residual stresses are developed in the material during deposition and cooling, potentially leading to part failure. WAAM of a prototypical large-scale Ti64 machine tool component is studied in this work via finite element analysis (FEA). Element activation/deactivation technique is employed to simulate deposition and the resulting distortion and residual stress (RS) predictions are analyzed to evaluate the possibility of crack formation. Significant distortion (∼10 mm) and RS (>1300 MPa) is predicted, suggesting the formation of cracks and possible crack propagation into the build region. Incorporation of fillets significantly reduces RS concentration regions, thus reducing the possibility of part failure. Material deposition sequence also affects the RS pattern in the build.

0705金属加工
ad
ad
Follow
ad
タイトルとURLをコピーしました