Design and Performance Research of Linear Focus 3D Printing Powder Nozzle Based on Aerodynamic Lens

doi:10.3901/JME.2023.11.253

Abstract

Abstract: A new type of 3D printing powder feeding nozzle with linear focusing based on “aerodynamic lens” is proposed, which can keep the powder stream in a convergent state within a certain distance from the nozzle outlet. The inner structure of the nozzle is designed, and the convergent movement model of powder particles in the nozzle is established. These factors are analyzed for studying the focusing performance of the powder particles: the Stokes number of the particle (S), the first aerodynamic lens aperture (d_f), the aperture shrinkage (δ) and the incident angle of the powder entering the nozzle (α). The research results show that for 316L particles with a particle size of 15-25 μm, the nozzle can focus the particles into a powder stream with a radius of 1.55 mm, and the powder stream maintains a good convergence state within 20 mm outside the nozzle. The numerical results are basically consistent with the experimental ones. The particle aggregation performance of the new aerodynamic lens 3D printing powder feeding nozzle is significantly better than that of the traditional nozzle, which is of great significance to promote the flexibility and adaptability of deposition additive manufacturing.

Key words: 3D printing, powder feeding nozzle, aerodynamic lens, powder flow

CLC Number:

TN249

LI Hongtao, HUANG Yanlu, YANG Yongqiang. Design and Performance Research of Linear Focus 3D Printing Powder Nozzle Based on Aerodynamic Lens[J]. Journal of Mechanical Engineering, 2023, 59(11): 253-263.

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