【摘要】 针对微织构刀具对切削工件表面残余应力的影响,设计不同尺寸的垂直槽和平行槽微织构,利用有限元仿真技术,模拟不同类型、不同尺寸微织构PCBN刀具干式车削GCr15试验。通过对有限元结果进行研究分析,得到已加工表面残余应力分布情况,并与无织构PCBN刀具对比,分析微织构对已加工表面残余应力的影响。有限元仿真结果表明:与无织构刀具切削工件表面获得拉应力相比,槽型织构刀具切削后的工件已加工表面呈现压应力,提高工件表层的耐磨损和耐疲劳性能;宽度50μm垂直槽和宽度40μm平行槽刀具切削得到的工件表面压应力最大,对工件表面应力分布影响最显著。更多还原

【Abstract】 Aiming at the influence of micro-texture tools on residual stress of cutting workpiece surface, the micro textures including vertical groove and parallel groove with different sizes were designed. The dry turning GCr15 experiment of different types and sizes of micro-texture PCBN tools was simulated by using finite element simulation technology. The distribution of residual stress on machined surface was obtained by studying and analyzing the results of finite element method, and compared with the non-texture PCBN tools, the effect of micro texture on the residual stress on machined surface was analyzed. The finite element simulation results showed, compared with the tension stress obtained by non-texture tool cutting workpiece, that the machined surface of the workpiece with groove-texture tool presented compressive stress, which improved the wear resistance and fatigue resistance of the workpiece surface; the maximum surface compressive stress was obtained when 50μm vertical-groove tool and 40μm parallel-groove tool cut GCr15, and micro-texture tools had the most significant effect on the surface stress distribution of the workpiece.更多还原