Zr基金属玻璃超精密加工切屑形成机理研究  

Study on Chip Formation Mechanism of Zr-based Metallic Glass in Ultra-precision Machining

作　　者：佘中迪 尤建峡 陈肖 许剑锋[2] 姚振华 SHE Zhongdi;YOU Jianxia;CHEN Xiao;XU Jianfeng;YAO Zhenhua(National Innovation Institute of Digital Design and Manufacturing,Wuhan 430074,China;Huazhong University of Science&Technology,Mechanical Science and Engineering,Wuhan 430074,China;School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070)

机构地区：[1]武汉数字化设计与制造创新中心有限公司,武汉430074 [2]华中科技大学机械科学与工程学院,武汉430074 [3]武汉理工大学材料科学与工程学院,武汉430070

出　　处：《武汉理工大学学报（交通科学与工程版）》2021年第2期384-389,共6页Journal of Wuhan University of Technology（Transportation Science & Engineering）

摘　　要：文中基于Nanoform X纳米超精密加工机床对Zr基金属玻璃进行划痕实验利用高分辨率测力仪及扫描电子显微镜对切削过程中的切削力和切屑形态进行了测量和表征.结果表明:随着切削速度和切削深度的增加,切屑的锯齿化程度增大,而变形程度减小;通过对比分析发现切削力的变化频率和切屑分离频率表现出高度一致性,说明周期性切削力的产生是由于锯齿状切屑的形成;在单个锯齿单元上有主剪切带及大量第二剪切带的形成,这和切削力在单个周期的变化情况也是高度吻合的,基于此阐释了锯齿状切屑的形成机理;同时,结合已建立的理论正交切削模型,对不同切削条件下主剪切区的剪切屈服应力进行了有效地预测.Scratch experiment of Zr-based metallic glass was carried out based on Nanoform X nano ultra-precision machining machine tool,and the cutting force and chip morphology in the cutting process were measured and characterized by using high-resolution dynamometer and scanning electron microscope.The results show that with the increase of cutting speed and cutting depth,the sawtooth degree of chips increases,while the deformation degree decreases.Through comparative analysis,it is found that the change frequency of cutting force and chip separation frequency is highly consistent,which indicates that the periodic cutting force is caused by the formation of serrated chips.The main shear band and a large number of second shear bands are formed on a single sawtooth unit,which is highly consistent with the change of cutting force in a single cycle.Based on this,the formation mechanism of sawtooth chips is explained.At the same time,combined with the established theoretical orthogonal cutting model,the shear yield stress in the main shear zone under different cutting conditions is effectively predicted.

关 键 词：金属玻璃 超精密切削 主剪切带 锯齿状切屑 

分 类 号：TG580.6[金属学及工艺—金属切削加工及机床]