硬质合金刀具高速干铣削Ti6Al4V刀具寿命研究及切削参数优化  

Study on Tool Life in Ti6Al4V High Speed-Dry Milling with Carbides and Cutting Parameter Optimization

作　　者：王晓琴[1] 艾兴[2] 赵军[2] 郭培全[1] 

机构地区：[1]济南大学机械工程学院,济南250022 [2]山东大学机械工程学院,济南250061

出　　处：《组合机床与自动化加工技术》2008年第8期15-18,共4页Modular Machine Tool & Automatic Manufacturing Technique

基　　金：国家自然科学基金(50575126);全国优秀博士学位论文作者专项资金(200231);济南大学实验技术研究项目(XJ200619)

摘　　要：Ti6Al4V是典型的难加工材料,切削效率低,刀具磨损严重。文章对硬质合金刀具在高速范围内干铣削Ti6Al4V进行了正交试验,获得了干切削状态下铣削刀具寿命的经验公式,并利用扫描电镜(SEM)和能谱分析(EDS)研究了铣削刀具的磨损形态和磨损机理,粘结、扩散及氧化是硬质合金刀具的主要磨损机理。最后,利用等寿命-效率响应曲面法,对硬质合金刀具在干切削状态下铣削Ti6Al4V的切削参数进行了优化,在效率不变的情况下,适当降低切削速度,增大切削深度,可以提高刀具寿命。试验刀具的切削参数优化结果为:切削速度40-60m/min、轴向切削深度0.5-1mm、径向切深7-10mm、进给量0.07-0.1mm/r,在建议切削参数下刀具寿命约在30-50min。Ti6Al4V is a difficult to machine alloy with low cutting efficiency and server tool wear. In this paper, a series of orthogonal milling tests with carbides in higher speed scale was carried out. The experiential functions of tool life based on orthogonal experiment were developed. Then, The tool wear morphologies were examined by scanning electron microscope（SEM）and energy disperse spectroscopy （EDS）, adhesion, diffusion and oxidation were the major wear mechanisms of carbides tool. Finally, the cutting parameters of carbide in Ti6Al4V dry milling were optimized based on tool life-efficiency contour analysis, the lower cutting speed and lager depth of cut are the better selection. In finish milling, for the selected tool, the optimized cutting parameters are cutting speed 40 - 60m/min, axial depth of cut 0.5 - 1m/min, radial depth of cut 7 - 10mm, feed rate 0.07 - 0.1mm/teeth, and the predictive tool life is about 30 - 50min in this cutting condition.

关 键 词：TI6AL4V 硬质合金 刀具磨损 刀具寿命 切削效率 

分 类 号：TH117[机械工程—机械设计及理论] TG506.1[金属学及工艺—金属切削加工及机床]