整体叶盘回转辅助水平振动式抛磨的颗粒力学行为仿真分析

针对目前抛磨整体叶盘存在的加工效率低、均匀一致性差等加工难题，采用回转辅助水平振动式滚磨光整加工工艺对整体叶盘进行抛磨加工。基于离散元法模拟加工过程中颗粒的作用行为，探究颗粒对整体叶盘的作用行为特征、作用力变化规律、作用力分布特征。结果表明:颗粒在整体叶盘流道区域与两侧无工件区域具有不同的运动特征，两侧颗粒仅能作用于整体叶盘的两侧区域；整体叶盘回转过程中，叶片在进出流场区域时会受到一些突变力的作用，沿回转方向叶片表面受力呈先增大后减小趋势，而且改变回转方向影响颗粒对叶背、叶盆的作用力波动幅度；颗粒对叶片表面的作用力存在明显的强弱差异，作用力RSD值在30%～60%，叶背强作用力主要集中于进气及叶尖区域，叶盆强作用力主要集中于排气及叶尖区域。 

Simulation analysis of particle mechanical behavior in rotary-assisted horizontal vibration polishing of blisk

To solve the problems of low efficiency and poor uniformity in polishing blisk, a rotary-assisted horizontal vibration mass finishing process was adopted. Based on the discrete element method, the behavior of particles in the process was simulated to study the characteristics of the particle behavior on the blisk, and the variation law and the distribution of the particle acting force. The results show that the particles have different movement feature in the flow passage area and the non-work-piece area, and the particles on both sides, where there is no workpiece, can only act on the two sides of the blisk. During the rotating process of the blisk, the blade would experience some sudden forces when entering or exiting the particle flow field. The force on blade surface increases at first and then decreases along the rotating direction. Moreover, changing the rotating direction affects the fluctuation range of the forces acting on the back surface and the basin surface of blade. The effect of particle on the blade surface is obviously different, whose RSD value is between 30% and 60%, and the strong force of the back surface of blade mainly appears in the areas of inlet and tip while at the basin surface of blade is generally focused in the areas of exhaust and tip.