基于EDEM的钛粉在振动成形中的填充密度模拟研究

Simulation on filling density of titanium powder in vibration forming based on EDEM

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 reduce the porosity and improve the packing density of titanium powder particles. Based on establishing the dynamic equation of particles contact process by discrete element method,numerical simulation of the titanium powder particle filling process was conducted using EDEM discrete element software,and the vibration state of titanium powder in different directions was analyzed. Results show that the filling density of titanium powder with single direction vibration is higher than that with two directions or three directions.The steady-state average packing density of x direction is 1.04 times and 1.06 times of xy and xyz directions,respectively. With the increase of vibration time,the filling density increases firstly and then turns stable. The optimum vibration time is 20s. The simulation has certain reference significance for the actual production of titanium powder.