基于离散元法的纯铁粉振动填充密度分析

Analysis on vibration packing density of pure iron powders based on discrete element method

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。

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.