单颗CBN磨粒微切削硬质合金YG8磨损研究  

Study on Wear of Single CBN Grain Micro-cutting YG8 Cemented Carbide

作　　者：陈凯[1] 杨长勇[1] 高绍武[1] 丁文锋[1] 祝丞 CHEN Kai;YANG Changyong;GAO Shaowu;DING Wenfeng;ZHU Cheng(College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]南京航空航天大学机电学院,江苏南京210016

出　　处：《机械制造与自动化》2021年第1期25-28,共4页Machine Building & Automation

基　　金：国家科技重大专项(2017-VII-0015-0111);中央高校基本科研业务项目(NS2018031)

摘　　要：微小孔用铰珩工具长径比大,刚度差,可以采用加工工艺方法对其进行修整。为揭示铰珩工具修整过程中CBN磨粒的磨损特性,采用光滑粒子流体动力学法,建立CBN磨粒微切削YG8硬质合金的仿真模型,并通过试验验证该模型的可行性。结果表明:在微切削YG8硬质合金过程中,随着累积材料去除体积的增加,CBN磨粒不断发生微破碎而使其磨损体积持续增大;在相同的累积材料去除体积下,随着切削宽度和切削深度增加,磨粒的相对磨损量呈现出先增大后减小的变化趋势。The reaming tool for small holes has a large aspect ratio and poor rigidity,and can be dressed by machining the workpiece.In order to annalyze the wear characteristics of CBN grain in the grinding process,a simulation model of CBN grain in micro-cutting of YG8 cemented carbide was built by Smooth Particle Hydrodynamic(SPH)method.In addition,a single grain micro-cutting test was carried out to investigate the grain wear evolution in the micro-cutting process.The conclusion is that the CBN grain displays micro-fracture wear characteristic and gradually increases wear volume during the micro-cutting process.And under the same material removal volume,and with the increase of cutting width and cutting depth,the relative wear of grain increases first and decreases after.

关 键 词：光滑粒子流体动力学 CBN 磨损 微切削 硬质合金 

分 类 号：TG506[金属学及工艺—金属切削加工及机床]