摘要：为了提高钕铁硼永磁粉体填充密度, 采用了振动的方法对磁粉颗粒位置进行重排, 以减小孔隙率, 通过离散元软件EDEM建立了粉体颗粒模型并进行了模拟分析, 模拟了在不同振动频率和振动时间下, 钕铁硼永磁粉体颗粒的运动状态。结果表明:随振动频率增大, 粉体填充密度先增大后减小, 在70 Hz时达到最大值;振动时间增加, 粉体填充逐渐密实, 且振动频率高, 填充密度达到最大值用时短, 振动频率低, 用时长。

关键词：振动频率；振动时间；填充密度；离散元法

Abstract：In order to improve the packing density of NdFeB magnet powder, the particles position were rearranged to decrease the voidage with the method of vibration, the model of magnet particles were established and simulated with discrete element software EDEM. The vibrational states of NdFeB magnet powder under different vibration frequency and vibration time were simulated and analyzed. The results show that, with the increase of frequency, the packing density of powder appears to increase first and then decrease, the density are the highest when the particles vibrate with frequency around 70 Hz. With the increase of time, the powder compacts gradually, the packing density reaches the maximum in a shorter time with a higher frequency, it reaches the maximum in a longer time with lower frequency.

Keywords: vibrating frequency；vibrating time；packing density；discrete element