Performance Analysis of Ball Mill Liner Based on DEM-FEM Coupling

In the paper, based on the finite element-discrete element method coupling and the coupled bionics theory, four lifting bar models with coupled bionic surface structures, such as smooth, transverse stripe, longitudinal stripe and convex hull, are established. The particle model with different geometric features is established and the coupled simulations using finite element-discrete element method are carried out. Results show that the lift bar with the coupled bionic structure with soft matrix-hard bearing unit can effectively reduce the equivalent stress of the lifting bar during grinding. This coupled bionic structure can also reduce wear and tear of the lifting bar, and therefore, the lifting bar is protected and the grinding effect is improved. Results also indicate that the transverse stripe-coupled bionic structure has the best wear resistance and grinding effect comparing among the four kinds of lifting bars.