刀具表面混合型微结构的形状和密度对润滑状态影响的仿真研究  

Simulation Study on the Effect of Shape and Density of Tool Hybrid Microstructure to the Lubrication State

作　　者：李健 郝秀清[1] 孙鹏程 陈馨雯 李亮[1] LI Jian;HAO Xiuqing;SUN Pengcheng;CHEN Xinwen;LI Liang(College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics & Astronautics,Nanjing Jiangsu 210016,China;Nanjing Tianjia Thermal Energy Technology Co.,Ltd.,Nanjing Jiangsu 210046,China)

机构地区：[1]南京航空航天大学机电学院,江苏南京210016 [2]南京天加热能技术有限公司,江苏南京210046

出　　处：《润滑与密封》2019年第10期6-15,共10页Lubrication Engineering

基　　金：国家自然科学基金项目(51875285);江苏省自然科学基金项目(BK20190066);中国博士后基金项目(2017M610327;2018T110493)

摘　　要：为研究变密度、变形状或变形状变密度混合型微结构对刀具润滑状态的影响,建立具有混合微结构的刀具和切屑界面的润滑模型,采用FLUENT软件计算油膜上壁面压力、承载力及入口质量流速参数,分析微结构的参数及排布对刀具润滑状态的影响。结果表明:变密度微结构根据重度磨损区、中度磨损区、轻度磨损区设置不同面积率,变形状微结构根据形状特点设置形状及排布,2种混合型微结构均可提高承载能力和增加润滑油入口质量流速;变形状变密度混合型微结构结合了变密度微结构和变形状微结构的优势,能更好地发挥微结构改善刀-屑界面润滑油膜分布、持续补充润滑剂的能力,从而可获得最佳的综合润滑性能。To study the influence of hybrid microstructures with variable densities,variable shapes and their simultaneous change on tool lubrication,the lubrication model,composed of the cutting tool with hybrid microstructures and chip,was established.The parameters of the output pressure on the upper surface of the oil film,the bearing capacity and the inlet mass flow rate were calculated,and the effect of structure parameters and shapes on the lubrication state was analyzed.The results show that variable density microstructures set different area ratios according to severe,moderate and mild wear zones,variable shape microstructures set different shape and arrangement according to their shape characteristics.Both combination microstructures can improve load-carrying capacity and increase mass flow rate of lubricating oil inlet.The combination microstructures with variable density and variable shape combine the advantages of variable density microstructures and variable shape microstructures,which can better exert the ability of microstructures to improve the oil film distribution at the tool-chip interface and continuously supply lubricants,so as to obtain the best comprehensive lubricating properties.

关 键 词：混合型微结构 承载力 油膜润滑 摩擦和磨损 

分 类 号：TG71[金属学及工艺—刀具与模具] TH117[机械工程—机械设计及理论]