Tool wear has an important influence on the residual stress distribution on the machined surface.Also,it will influence the fatigue life of finished workpiece. In this research,the hard turning process of hardened die...Tool wear has an important influence on the residual stress distribution on the machined surface.Also,it will influence the fatigue life of finished workpiece. In this research,the hard turning process of hardened die steel Cr12 MoV was studied by using PCBN tool with considering tool wear. Based on the numerical treatment of residual stress,the dispersion and distribution curves of different tool wear were fitted,and the influence mechanism of tool wear on the residual stress distribution of machined surface was analyzed.Based on the theory of fatigue mechanics and mathematical statistics,the mathematical model for difference of stress dispersion and fatigue life was established. The rotating and bending tests were carried out on the standard parts after cutting process for the workpiece. The influence of tool wear on fatigue life was revealed by fracture surface morphology and fatigue life study. The results provide theoretical support for control of residual stress and the fatigue property of the machined surface under the actual working conditions.展开更多
通过干式车削试验,以CAK5085si型数控车床为研究对象,提出了机床功率特性与切削工艺参数合理匹配的问题,得到了不同切削速度下切削温度、切削力、切削振动及工件表面质量的变化趋势,揭示了机床输出功率与切削参数、工件加工质量的关系...通过干式车削试验,以CAK5085si型数控车床为研究对象,提出了机床功率特性与切削工艺参数合理匹配的问题,得到了不同切削速度下切削温度、切削力、切削振动及工件表面质量的变化趋势,揭示了机床输出功率与切削参数、工件加工质量的关系。试验结果表明:切削功率如果接近或超出机床的最大允许功率7.5 k W时,切削过程会出现明显的不稳定现象,这为快速判断切削参数的合理性及数控机床自适应切削功能的开发,提供了重要的理论依据。展开更多
基金Sponsored by the National Natural Science Foundation of China(Grant No.51575147)the Science Funds for the Young Innovative Talents of HUST(Grant No.201507)
文摘Tool wear has an important influence on the residual stress distribution on the machined surface.Also,it will influence the fatigue life of finished workpiece. In this research,the hard turning process of hardened die steel Cr12 MoV was studied by using PCBN tool with considering tool wear. Based on the numerical treatment of residual stress,the dispersion and distribution curves of different tool wear were fitted,and the influence mechanism of tool wear on the residual stress distribution of machined surface was analyzed.Based on the theory of fatigue mechanics and mathematical statistics,the mathematical model for difference of stress dispersion and fatigue life was established. The rotating and bending tests were carried out on the standard parts after cutting process for the workpiece. The influence of tool wear on fatigue life was revealed by fracture surface morphology and fatigue life study. The results provide theoretical support for control of residual stress and the fatigue property of the machined surface under the actual working conditions.
文摘通过干式车削试验,以CAK5085si型数控车床为研究对象,提出了机床功率特性与切削工艺参数合理匹配的问题,得到了不同切削速度下切削温度、切削力、切削振动及工件表面质量的变化趋势,揭示了机床输出功率与切削参数、工件加工质量的关系。试验结果表明:切削功率如果接近或超出机床的最大允许功率7.5 k W时,切削过程会出现明显的不稳定现象,这为快速判断切削参数的合理性及数控机床自适应切削功能的开发,提供了重要的理论依据。
