Dynamic numerical simulation on grinding medium flow field for vibration mill under various vibrating amplitude–frequency combination conditions

Abstract

People gained limited progress on refinement of super-hard powder using the vibration mill for many years. According to various amplitude–frequency combination working conditions of vibration mill prototype, simulation research on dynamic characteristic of grinding medium flow field based on PFC is proposed in the paper, and a dynamics model of grinding medium flow field in barrel is established. Furthermore, trajectory image of medium flow, kinetic energy and strain energy and collision frequency can be obtained. The simulation analysis shows that collision between media as well as between media and the barrel can cause the changes of kinetic energy and strain energy of grinding medium flow under various amplitude–frequency combination conditions, and an energy-lacking region exists in the barrel. Contrast experiments under various working conditions show that kinetic energy and strain energy of grinding medium flow have large increment and energy-lacking regions become smaller, and then energy consumption decreases on working condition of high-amplitude and middle-frequency. The conclusion has practical value to refine powder by high-intensity vibration mill with certain frequency.