一维振动式滚磨光整加工颗粒流场的离散元模拟分析

Discrete Element Simulation Analysis of Particle Flow Field in One-dimensional Vibration Barrel Finishing

为研究一维振动式滚磨光整加工中不同振幅、频率、筒宽下的颗粒流场分布及运动特征,基于离散元法对滚磨光整加工过程进行数值模拟与分析。研究发现:加工过程中,颗粒群可根据颗粒位置分为上中下三层,上层颗粒速度波动较大,且在一段时间后,颗粒速度会处于动态平衡状态;中层和底层颗粒速度始终在一定范围内波动,且具有周期性;不同层域的颗粒开始运动后都会有爬升,一段时间后处于动态平衡,上层颗粒的爬升值最大,底层颗粒的爬升值最小;随着频率和振幅增加,颗粒的爬升高度增加;筒宽越宽,爬升高度越小。

In order to study the particle flow field distribution and movement characteristics under different amplitudes,frequencies and barrel widths in one-dimensional vibratory barrel finishing,the numerical simulation and analysis of the barrel finishing process are carried out based on discrete element method.The study finds that the particle group in processing is divided into upper,middle and lower layers according to the position of the particles.The particle velocity of the upper layer fluctuates greatly,and after a period of time,the particle velocity will be in a dynamic equilibrium state;the particle velocity of the middle and bottom layers is always constant fluctuation in the range and periodicity;particles in different layers will climb after they start to move,and they will be in dynamic equilibrium after a period of time.The upper layer particles have the largest climb value and the bottom layer particles have the smallest climb value.As the frequency and amplitude increase,the climbing height of the particles increases;the wider the tube width,the smaller the climbing height.