叶片安装高度对水平振动抛磨介质作用行为影响

Analysis of Action Behavior of Granular Medium on Blade in One-Dimensional Vibration Polishing

为探究叶片安装高度对颗粒介质作用行为的影响,基于离散元法分析叶片不同安装高度下颗粒介质流场特征及其力学行为,并进行振动抛磨实验,采用粗糙度仪和超景深三维显微镜测试不同安装高度下叶片加工前后表面粗糙度及表面形貌的变化。结果表明,随着叶片距容器底部高度h增加,颗粒介质对叶盆表面的接触力、相对切向速度及切向累积接触能量逐渐减小,对叶背表面的接触力和切向累积接触能量先增大后减小,相对切向速度逐渐减小;表面粗糙度下降率随h变化规律与切向累积接触能量一致,当h=16 mm时,叶盆、叶背表面粗糙度均下降至0.25μm,获得较好的加工效果。叶片安装高度显著影响了颗粒介质对叶片表面的力、相对速度和接触能量,进而改变颗粒介质对叶片的抛磨效果,接触力为影响抛磨效果的主要因素。

In order to explore the influence of blade mounting height on the action behavior of granular media,the flow field characteristics and mechanical behavior of granular media under different blade mounting heights were analyzed based on the discrete element method,and the vibration polishing experiment was carried out.The changes of surface roughness and surface morphology before and after blade machining under different mounting heights were measured by roughness instrument and ultra-depth three-dimensional microscope.The results show that with the increase of the height h from the blade to the bottom of the container,the contact force,relative tangential velocity and tangential cumulative contact energy of the granular medium on the blade basin surface gradually decrease,the contact force and tangential cumulative contact energy on the blade back surface first increase and then decrease,and the relative tangential velocity gradually decreases;The variation law of surface roughness reduction rate with h is consistent with the tangential cumulative contact energy.When h=16 mm,the surface roughness of leaf basin and leaf back decreases to 0.25μm.Better processing effect is obtained.The blade installation height significantly affects the force,relative velocity and contact energy of granular medium on the blade surface,and then changes the polishing effect of granular medium on the blade.The contact force is the main factor affecting the polishing effect.