INVESTIGATION INTO SLM BLADE INCLINATION EFFECT ON POWDER SPREADING BEHAVIOR BASED ON DISCRETE ELEMENT METHOD

被引：0
|
作者：
Li W. [1 ]
Liu Q. [1 ]
Gao Y. [1 ]
Chu X. [2 ]
Zhang Z. [3 ]
Wang Z. [1 ]
机构：
[1] Jiangxi Key Laboratory of Forming and Joining Technology for Aerospace Components, Nanchang Hangkong University, Nanchang
[2] School of Civil Engineering, Wuhan University, Wuhan
[3] Department of Engineering Mechanics, Dalian University of Technology, Liaoning, Dalian
来源：
Lixue Xuebao/Chinese Journal of Theoretical and Applied Mechanics | / 56卷 / 03期
关键词：
blade inclination; discrete element method; flow mechanism; selective laser melting; spreading process;
D O I：
10.6052/0459-1879-23-462
中图分类号：
学科分类号：
摘要：
The blade inclination plays a significant role on the powder spreading behavior during the selective laser melting process. In this paper, a discrete element numerical model is established to investigate the powder spreading process and quality with different blade inclination angles. A quantitative indicator was proposed for different blade inclination angles to comprehensively evaluate the packing density and uniformity of the powder layer and the influence law of blade inclination on deposition quality is obtained. Based on the particle distribution and motion characteristics, the particle heap is divided into four zones including bottom layer zone, slope zone, blade influence zone, and internal zone. The powder spreading dynamic mechanism is comprehensively analyzed for the four regions, including particle trajectories and velocity fields, the shear band in front of the blade, and the distribution and evolution of inter-particle forces. It is found that when the inclination angle is less than zero, it is difficult for the particle heap to form a complete circulating flow, the shear band is relatively small, fewer particles flow towards the deposition layer, the packing density of powder layer decreases, fewer strong force chains between particles form, and force arches are easily formed in front of the blade gap, leading to particle jamming and the formation of voids. Therefore, the density and uniformity of deposition layer are poor. When the angle is greater than zero, the circulating movement of particle system is adequate, the shear band is larger, and more particles flow to the deposition layer, and the packing density of powder layer increases. As the inclination angle increases, the strong force chains increase, and the compaction effect of the blade is enhanced, which is beneficial for improving the density and uniformity of the deposition layer. This study provides a theoretical reference for the process parameter optimization and powder bed quality improvement. © 2024 Chinese Society of Theoretical and Applied Mechanics. All rights reserved.
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页码：774 / 784
页数：10
相关论文
共 32 条
  • [1] Lian Yanping, Wang Panding, Gao Jie, Et al., Fundamental mechanics problems in metal additive manufacturing: A state-of-art review, Advances in Mechanics, 51, 3, pp. 648-701, (2021)
  • [2] Capozzi LC, Sivo A, Bassini E., Powder spreading and spread ability in the additive manufacturing of metallic materials: A critical review, Journal of Materials Processing Technology, 308, (2022)
  • [3] Zhang Jiangtao, Tan Yuanqiang, Ji Caiyuan, Et al., Research on the effects of roller-spreading parameters for nylon powder spreadability in additive manufacturing, Chinese Journal of Theoretical and Applied Mechanics, 53, 9, pp. 2416-2426, (2021)
  • [4] Chen H, Wei Q, Wen S, Et al., Flow behavior of powder particles in layering process of selective laser melting: Numerical modeling and experimental verification based on discrete element method, International Journal of Machine Tools and Manufacture, 123, pp. 146-159, (2017)
  • [5] Chen H, Wei Q, Zhang Y, Et al., Powder-spreading mechanisms in powder-bed-based additive manufacturing: Experiments and computational modeling, Acta Materialia, 179, pp. 158-171, (2019)
  • [6] Meier C, Weissbach R, Weinberg J, Et al., Modeling and characterization of cohesion in fine metal powders with a focus on additive manufacturing process simulations, Powder Technology, 343, pp. 855-866, (2019)
  • [7] Meier C, Weissbach R, Weinberg J, Et al., Critical influences of particle size and adhesion on the powder layer uniformity in metal additive manufacturing, Journal of Materials Processing Technology, 266, pp. 484-501, (2019)
  • [8] Si L, Zhang T, Zhou M, Et al., Numerical simulation of the flow behavior and powder spreading mechanism in powder bed-based additive manufacturing, Powder Technology, 394, pp. 1004-1016, (2021)
  • [9] Han Q, Gu H, Setchi R., Discrete element simulation of powder layer thickness in laser additive manufacturing, Powder Technology, 352, pp. 91-102, (2019)
  • [10] Liu Hailin, Yi Min, Wang Jianxiang, Et al., Numerical simulations of powder spreading process insel-ective laser melting and powder layer characterization, Chinese Journalof Theoretical and Applied Mechanics, 55, 9, pp. 1-18, (2023)
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