Chip formation in high speed milling of Ti-6Al-4V alloy under nitrogen-oil-mist  

作　　者：赵威 何宁 李亮 满忠雷 

机构地区：[1]College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics and Astronautics

出　　处：《Journal of Harbin Institute of Technology(New Series)》2008年第4期564-567,共4页哈尔滨工业大学学报（英文版）

基　　金：the National Natural Science Foundation of China (Grant No. 50175051)

摘　　要：High speed milling experiments using nitrogen-oil-mist as the cutting medium were carried out to investigate the characteristics of chip formation for Ti-6Al-4V alloy.Within the range of conditions employed(cutting speed,vc=190-300 m/min;cutting depth of axial,ap=5,7 mm),saw-tooth chips were produced in these experiments.During the macro and micro analysis of the Ti-6Al-4V chips,an optical microscope and a scanning electron microscope(SEM)were used to study the microstructure and the morphology of the chips,and the X-ray photoelectron spectroscopy(XPS)was employed for chemical analysis.Comparisons were made to study the influence of different cutting media(nitrogen-oil-mist,air-oil-mist and dry cutting condition)on chip formation.Results indicate that cutting media have significant effects on chip formation.Nitrogen-oil-mist is more suitable for improving the contact condition at chip-tool interface and increasing the tool life in high speed milling of Ti-6Al-4V alloy than air-oil-mist and dry cutting.High speed milling experiments using nitrogen-oil-mist as the cutting medium were carried out to investigate the characteristics of chip formation for Ti-6Al-4V alloy.Within the range of conditions employed（cutting speed,vc=190-300 m/min;cutting depth of axial,ap=5,7 mm）,saw-tooth chips were produced in these experiments.During the macro and micro analysis of the Ti-6Al-4V chips,an optical microscope and a scanning electron microscope（SEM）were used to study the microstructure and the morphology of the chips,and the X-ray photoelectron spectroscopy（XPS）was employed for chemical analysis.Comparisons were made to study the influence of different cutting media（nitrogen-oil-mist,air-oil-mist and dry cutting condition）on chip formation.Results indicate that cutting media have significant effects on chip formation.Nitrogen-oil-mist is more suitable for improving the contact condition at chip-tool interface and increasing the tool life in high speed milling of Ti-6Al-4V alloy than air-oil-mist and dry cutting.

关 键 词：green machining Ti-6Al-4V alloy chip formation high speed milling nitrogen gas 

分 类 号：TG501.1[金属学及工艺—金属切削加工及机床] TG506.15