离散单元法在行星式球磨机仿真中的应用

Review of Simulation of Planetary Ball Mill by Discrete Element Method

为了认识与系统结构、操作条件以及材料性能相关的参数对行星式球磨机研磨性能的影响,对国内外将离散单元法用于模拟和分析行星式球磨机球磨过程的研究进行归纳和总结,阐述从物料运动、能量转换、磨损和大型化等领域的研究与应用成果。结果表明:操作条件的优化可使有效碰撞和高能碰撞处于较优的比例;具体环境下,冲击和研磨对于物料细化的效果有待探索;粉体的团聚和润滑作用会阻碍粉体的细化;几何相似大型化后的介质碰撞能量正比于规模化比例的4.87次方。

To understand the influence of many variables related to system geometry, operating conditions and material properties on the performance of planetary ball mill, the researches both at home and abroad about the simulation and analysis of the milling process of planetary ball mill using discrete element method were analyzed and summarized. The progress was reviewed from the aspects of charge motion, energy conversion, wear and scale-up. The results show that optimization of operating conditions can make effective collisions and high energy collisions be in the optimum ratios. The effect of impact and grinding for the refinement of materials remains to be explored under specific environment. The agglomeration and lubrication of powders can hinder powder refinement. When the planetary mill is scaled-up in geometrical similarity, the impact energy of balls is propotional to 4.87 power of the scale-up ratio.