Скачать или смотреть Packing density of different powder bed in LPBF using AM PravaH

The packing density of different powder bed in LPBF using AM PravaH

Powder bed preparation is a crucial process in #additivemanufacturing with the lpbf (Laser Powder Bed Fusion) approach. A high packing density is desirable, but, because of uncertainties arising from the choice of powder atomization machines (argon-based vs water-based atomization) and the choice of process parameters, the packing densities can vary significantly.

The animation below is a compilation of simulation results for various combinations of powder particle shapes (blockiness, aspect ratio, sphericity, etc), mixtures, and spreader arrangements (translating blade, rotating roller). And as expected the packing densities vary significantly.

Specifically, four scenarios including spherical, ellipsoidal, cylindrical, and mixed powder fractions are used in this comparison. Their sizes vary from 10-64 microns. Also, the impact of the spreader shape on the packing density is compared. The spreaders translate at a speed of 0.005 m/s while the roller also rotates with a fixed angular velocity.

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