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机械振动能够有效对钛粉颗粒进行重排来降低孔隙率,进而提高其填充密度。在采用离散元法建立颗粒接触过程动力学方程的基础上,应用EDEM离散元软件数值模拟了钛粉颗粒填充过程,分析了钛粉在不同振动方向条件下的振动状态。结果表明:单一方向振动的钛粉填充密度高于两方向或三方向混合振动的钛粉填充密度。x方向的稳态平均填充密度分别是xy和xyz方向的1.04倍和1.06倍。随着振动时间的延长,填充密度表现出先增加然后稳定的变化规律,最佳的振动时间是20s。该模拟对钛粉实际生产具有一定参考意义。
Mechanical vibration can effectively rearrange the titanium powder particles to reduce the porosity, thereby increasing its packing density. Based on the discrete element method to establish the kinetic equation of particle contact process, the EDEM discrete element software was used to simulate the particle filling process of titanium powder. The vibration state of titanium powder under different vibration directions was analyzed. The results show that the packing density of titanium powder vibrated in one direction is higher than that of titanium powder mixed in two directions or three directions. The steady state average packing density in the x direction is 1.04 and 1.06 times, respectively, in the xy and xyz directions. With the extension of vibration time, the packing density showed the first increase and then the stable variation, the best vibration time is 20s. The simulation of the actual production of titanium powder has a certain reference value.