摘要
为了揭示ELID高效磨削的机理,首先,基于单颗磨粒与工件接触模型,借助有限元方法研究了氧化膜厚度y、磨粒突出高度h、下压位移z对单颗磨粒压入深度m的影响。通过回归分析,获取了单颗磨粒压入深度m的预测模型。然后,根据砂轮表面磨粒突出高度概率分布函数,建立了不同突出高度磨粒与工件的接触条件。通过对磨粒有效突出高度的离散化处理,提出了磨粒不同突出高度的离散区间的概率计算模型,最后运用概率统计学的方法得到了材料去除率模型。结果表明:ELID磨削砂轮表面生成的适当厚度的氧化膜会使得单颗磨粒压入深度m增大,尤其是突出高度较小的磨粒。氧化膜的弹性变形大,使得更多的磨粒参与工作,材料去除率理论上最大可增加48%。
In order to investigate the mechanism ofELID high efficiency grinding,a contact model between single abrasive particle and workpiece was established.Based on the contact model,the effects of variable oxide film thickness y,protruding height h and pressing displacement z on pressing depth m of single abrasive were analysed by finite element mothod,and the simulation results of pressing depth m of single abrasive were obtained.Through the regression analysis of the simulation results,a prediction model of the pressing depth m was proposed.Based on the probability distribution function of protrusion height on the surface of grinding wheel,the contact conditions of abrasive particles with different protrusion height were established.By discretization of the effective protrusion height of the abrasive particles,the probability calculation model of the discrete interval of different protrusion height of the abrasive particles was proposed,and the material removal rate model was obtained by the method of probability statistics.The results show that the oxide film generated on the surface of ELID grinding wheel can increase pressing depth m of single abrasive,especially the grinding particles with small heigh.The large elastic deformation of the oxide film makes more abrasive particles participate in the work,and the material removal rate can increase by up to 48% theoretically.
作者
刘冲
杨绿
吴怀超
LIU Chong;YANG Lv;WU Huai-chao(School of Mechanical Engineer,Guizhou University,Guizhou Guiyang 550025,China)
出处
《机械设计与制造》
北大核心
2024年第11期155-159,共5页
Machinery Design & Manufacture
基金
贵州省科技重大专项(黔科合重大专项字[2019]3016号-1)。
关键词
ELID
高效磨削
磨削机理
氧化膜
ELID
High Efficiency Grinding
Grinding Mechanism
Oxide Film
