积屑瘤状态对微细切削表面轮廓特征的影响  

Influence of built-up edge phases on characteristics of surface profile of micro cutting

作　　者：刘志兵[1] 王西彬[1] 

机构地区：[1]北京理工大学先进加工技术国防重点学科实验室,北京100081

出　　处：《光学精密工程》2011年第1期90-96,共7页Optics and Precision Engineering

基　　金：国家自然科学基金资助项目(No.50935001;No.50875026);"高档数控机床与基础制造装备"科技重大专项课题(No.2009ZX04014-044);北京理工大学科技创新计划课题(No.CX02016)

摘　　要：研究了微细切削条件下,刀具前刀面上的积屑瘤状态对切削表面轮廓特征的影响,为合理选择和控制微细切削刀具的切削条件,以及评价微细切削的表面形貌特征提供实验依据。利用表面粗糙度仪分别提取了无积屑瘤、积屑瘤生长、稳定和脱落等4种积屑瘤状态下的切削表面轮廓,选取幅值密度函数(ADF)、自相关函数(ACF)和功率谱密度函数(PSD)等数理统计函数,以及时间序列模型参数和自回归(AR)谱分析了聚晶金刚石(PCD)刀具表面积屑瘤状态对微细切削表面轮廓特征的影响规律。结果表明,无积屑瘤和积屑瘤稳定阶段,AR谱的谱峰分别出现在91.7 c/mm和93.7c/mm处,与进给量的倒数比较接近;积屑瘤生长和脱落状态阶段,谱峰出现的空间频率明显偏低,与进给量之间的对应关系不再显著。积屑瘤与切屑之间的不规则接触将破坏微细切削表面轮廓空间结构的一致性;积屑瘤生长和脱落阶段获得的表面轮廓的AR谱中存在明显的空间低频谱峰。The influences of Built-up Edge（BUE） phases of a rake face on the characteristics of surface profile of micro cutting were researched,which provided the proof for the optimal selection of cutting parameters and the evaluation for the characteristics of surface profile of micro cutting.The surface profile data in micro cutting were measured with a profilometer in different BUE phases,BUE free,BUE formation,BUE stable and BUE drop.The influences of the BUEs on the characteristics of machined surface profiles were analyzed with mathematical statistical functions such as Amplitude Density Function（ADF）,Auto-correlation Function（ACF） and Power Spectral Density Function（PSD）,as well as the time series model parameters and Auto Regression（AR） spectra.Obtained results indicate that in BUE free and BUE stable phases,the AR spectral peaks of micro cutting surface locate at 91.7 c/mm and 93.7 c/mm,respectively,which are very close to the reciprocal of a feed rate;while in BUE formation and BUE drop phases,the spatial frequency is significantly low compared with the reciprocal of feed rate.It is concluded that the consistency of the surface profile is deteriorated by the irregular contact between BUE and chip,and the low spatial frequency component becomes more dominant in the AR spectra of machined surface profile during BUE formation and BUE drop phases.

关 键 词：微细切削 积屑瘤 表面轮廓 数理统计函数 自回归谱 

分 类 号：TG501[金属学及工艺—金属切削加工及机床]