In laser selective melting, the forming of powder bed will significantly affect the subsequent process and the quality of final products. In this paper, the dynamic numerical simulation of powder spreading behavior and forming quality in SLM forming process is carried out by using discrete element method (DEM). The influencing factors of powder bed quality are studied from two aspects of density and uniformity. The results show that the effect of powder spreading speed on the quality of powder bed is obvious. The powder spreading speed, powder spreading angle, scraper clearance height and powder particle size all have an important influence on improving the average density and uniformity of the powder bed. The lower the powder spreading speed, the higher the quality of powder bed and the lower the working efficiency. With the increase of the clearance height of the scraper, the density of the powder bed increases and the uniformity of the powder bed decreases to a lower value. The density of powder bed increases with the increase of powder laying angle, and then decreases. The structural uniformity of the whole powder bed also has a similar change trend. Increasing the particle size of powder will reduce the density of powder bed and the uniformity of powder bed structure. The powder spreading speed is 0.1 m/s, the clearance height of scraper is 90 μm. The powder spreading angle is 15°, and the powder particle size is 15 μm, the powder bed forming quality is the best. The research results of this paper will provide a valuable reference for the formation of high-quality powder bed in SLM process.
GE Yaqiong
,
LI Jipeng
,
CHANG Zexin
,
MA Mingfeng
,
HOU Qingling
. Numerical simulation of laid powder based on selective laser melting[J]. Transactions of The China Welding Institution, 2023
, 44(1)
: 93
-98
.
DOI: 10.12073/j.hjxb.20220212001
[1] Zhang X C, Wang JW, Kang J W, et al. The dynamic arch bending mechanism of flat bridge structure of AlSi10Mg during SLM process[J]. Materials & Design, 2020, 188: 108469.
[2] Attar H, Ehtemam-Haghighi S, Kent D, et al. Recent developments and opportunities in additive manufacturing of titanium-based matrix composites: a review[J]. International Journal of Machine Tools & Manufacture: Design, research and application, 2018, 133: 85 - 102.
[3] Yang W L, He X J, Li H P, et al. A tribological investigation of SLM fabricated TC4 titanium alloy with carburization pretreatment[J]. Ceramics International, 2020, 46: 3043 - 3050.
[4] Fouda Y M, Bayly A E. A DEM study of powder spreading in additive layer manufacturing[J]. Granul. Matter, 2019, 22: 1 - 18.
[5] 丁宏德, 朱春明, 唐斌, 等. 316L不锈钢SLM件与锻件的激光焊接头微观组织与性能[J]. 焊接, 2021(5): 9 - 14
Ding Hongde, Zhu Chunming, Tang Bin, et al. Microstructure and properties of laser welded joint between 316L stainless steel SLMed and forged parts[J]. Welding & Joining, 2021(5): 9 - 14
[6] 王凯, 焦向东, 朱加雷, 等. 激光功率密度对SLM成形TC4磨损性能的影响[J]. 焊接学报, 2020, 41(5): 61 - 64
Wang Kai, Jiao Xiangdong, Zhu Jialei, et al. Effect of laser power density on wear resistance of TC4 alloy manufactured by SLM[J]. Transactions of The China Welding Institution, 2020, 41(5): 61 - 64
[7] 杨立军, 燕珂, 邓亚辉, 等. 激光选区熔化TC4钛合金工艺参数对成形件表面质量的影响[J]. 应用激光, 2022, 42(5): 43 - 50
Yang Lijun, Yan Ke, Deng Yahui, et al. Effect of Process Parameters on Surface Quality of TC4 Alloy by Laser Selective Melting[J]. Applied Laser, 2022, 42(5): 43 - 50
[8] Haeri S, Wang Y, Ghita O, et al. Discrete element simulation and experimental study of powder spreading process in additive manufacturing[J]. Powder Technology, 2017, 306: 45 - 54.
[9] Partel E J Ri, oschel T P. Particle-based simulation of powder application in additive manufacturing[J]. Powder Technology, 2016, 288: 96 - 102.
[10] Han Q Q, Gu H, Setchi R. Discrete element simulation of powder layer thickness in laser additive manufacturing[J]. Powder Technology, 2019, 352: 91 - 102.
[11] Nan W G, Pasha M, Bonakdar T, et al. Jamming during particle spreading in additive manufacturing[J]. Powder Technology, 2018, 338: 253 - 262.
[12] Estupinan Donoso A A , Computational study of the industrial synthesis of tungsten powders[J]. Powder Technology, 2019, 344: 773–783.
[13] Chen H, Wei Q S, Wen S F, et al. Flow behavior of powder particles in layering process of selective laser melting: numerical modeling and experimental verification based on discrete element method[J]. International Journal of Machine Tools and Manufacture, 2017, 123: 146 - 159.
[14] Ma Y F, Evans T M, Philips N, et al. Numerical simulation of the effect of fine fraction on the flowability of powders in additive manufacturing[J]. Powder Technology, 2020, 360: 608 - 621.
[15] Haeri S. Optimisation of blade type spreaders for powder bed preparation in additive manufacturing using DEM simulations[J]. Powder Technology, 2017, 321: 94 - 104.
[16] Wang L, Li E L, Shen H, et al. Adhesion effects on spreading of metal powders in selective laser melting[J]. Powder Technology, 2020, 363: 602 - 610.
[17] Gou D Z, An X Z, Zhao H Y, et al. Dynamic characteristics of binary sphere mixtures under air impact[J]. Powder Technology, 2018, 332: 224 - 233.
[18] Qian Q, An X Z, Zhao H Y, et al. Particle scale study on the crystallization of mono-sized cylindrical particles subject to vibration[J]. Powder Technology, 2019, 352: 470 - 477.
[19] Yang R Y, Zou R P, Yu A B. Computer simulation of the packing of fine particles[J]. Physical review A, Atomic, molecular, and optical physics, 2000, 62: 3900 - 3908.
[20] Nan W G, Pasha M, Ghadiri M. Numerical simulation of particle flow and segregation during roller spreading process in additive manufacturing[J]. Powder Technology, 2020, 364: 811 - 821.
[21] Chen H, Wei Q S, Zhang Y J, et al. Powder-spreading mechanisms in powder-bed-based additive manufacturing: experiments and computational modeling[J]. Acta Materialia, 2019, 179: 158 - 171.
[22] Meier C, Weissbach R, Weinberg J, et al. Critical influences of particle size and adhesion on the powder layer uniformity in metal additive manufacturing[J]. Journal of Materials Processing Technology, 2019, 266: 484 - 501.
