Machine Health Verification Process for Laser Powder Bed Fusion

Hilton, Zachary; Gray, Jamee; Montano, Bianca; McCann, John J.; Deal, Andy; Roy, Kristen

doi:10.2172/1877609

Cited by 1 publication

(2 citation statements)

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“…Wang and Chang 36 investigated the flow uniformity produced by different trapezoidal nozzle widths, suction channel widths, and nozzle-to-plane distances. Philo et al 37 developed a discrete phase model (DPM) to simulate splashes and explore the effect of inlet design parameters on the splash. Accordingly, it was found that as the inlet radius increases, the corresponding flow uniformity and average velocity improve, and the material splash reduces significantly.…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, the maximum velocity of the bottom gas stream in the contact with the powder is limited by the threshold velocity of the powder. Currently, most solutions to improve the flow uniformity are for a single inlet nozzle 31–37 and no additional inlet nozzle is considered. Therefore, further investigations should be carried out to increase the flow uniformity in the chamber and improve the spatter removal rate.…”

Section: Introductionmentioning

confidence: 99%

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Optimization of the gas flow system in a selective laser melting chamber using numerical methods

Zhou,

Li,

Chen

et al. 2024

Advances in Mechanical Engineering

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A well-designed flow field is a key factor to improve the surface quality of products by removing spatter, which is often generated during the selective laser melting (SLM) process. In the present study, three typical schemes are developed for the gas flow system of large-scale SLM equipment. In this regard, the flow deviation and velocity increase indices are implemented to characterize the flow uniformity in the chamber and gas flow velocity in the clearing area. The obtained results show that the inlet size significantly improves the flow uniformity and the segmented inlet increases the flow velocity above the machining surface. More specifically, when the velocity deviation index decreases from 0.3335 to 0.1538, the corresponding velocity index increases from 10.16% to 29.83%. To improve the flow uniformity on the machining surface, the effect of the inlet flow rate on the airflow over the machining surface is investigated. The obtained results show that when the inlet flow rate reduces to 0.2 m/s, the removal spatter improves while the airflow remains uniform. The results of this study can provide a reference for the design of SLM gas flow systems.

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Section: Introductionmentioning

confidence: 99%