Analysis on vibration packing density of pure iron powders based on discrete element method
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摘要: 为了提高粉末冶金制品的密度，采用振动的方法促进铁粉颗粒运动与重排，降低粉体的孔隙率，提高纯铁粉体的填充密度。利用离散元软件EDEM对模腔中纯铁粉体的振动填充过程进行数值模拟，研究了振动频率、振动幅度、振动时间对粉体填充密度的影响，确定出最佳工艺参数，并通过对比实验验证了仿真结果的可靠性。结果表明：振动频率和振动幅度对粉体填充密度的影响较大，随着频率和振幅的增大，填充密度先增加后减小；随着振动时间的增大，填充密度先增加后趋于稳定。Abstract: To increase the compaction density of the powder metallurgy products, the vibration was used to promote the movement and rearrangement of the iron powder particles, reduce the porosity of powders, and improve the packing density of powders. The vibration packing process of pure iron powders in the cavity was numerically simulated by the EDEM discrete element software. The influences of vibration frequency, vibration amplitude, and vibration time on the packing density of the powders were studied, the optimal technological parameters were determined, and the reliability of simulation was confirmed by the comparative experiment. The results show that, the packing density of powders is significantly influenced by the vibration frequency and amplitude. With the increase of the vibration frequency and amplitude, the packing density firstly increases, and then reduces; with the increase of the vibration time, the packing density firstly increases, and then tends to be stable.
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Key words:
- packing density /
- vibration frequency /
- vibration amplitude /
- vibration time /
- discrete element method
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图 3 颗粒生成状态：（a）0 s；（b）0.15 s；（c）0.4 s；（d）1.0 s
Figure 3. Generation states of particles: (a) 0 s; (b) 0.15 s; (c) 0.4 s; (d) 1.0 s
图 4 振动时间与填充密度的关系
Figure 4. Relationship between the vibration time and packing density
图 5 振动频率与填充密度的关系
Figure 5. Relationship between the vibration frequency and packing density
图 6 颗粒振动受力云图：（a）30 Hz；（b）100 Hz
Figure 6. Stress contours of the particle vibration: (a) 30 Hz; (b) 100 Hz
图 7 振动幅度与填充密度的关系
Figure 7. Relationship between the vibration amplitude and packing density
图 9 对比试验中振动频率与填充密度的关系
Figure 9. Relationship between the vibration frequency and packing density in the contrast experiment
表 1 铁粉颗粒接触模型参数
Table 1. Contact model parameters of Fe powder particles
材料 恢复系数 静摩擦系数 滚动摩擦系数 颗粒-颗粒 0.15 0.30 0.01 颗粒-钢 0.13 0.25 0.01 
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