高速干切削工件表面残余应力分析  

Study on Surface Residual Stress in Dry High-Speed Cutting

作　　者：徐颖强[1] 郭彩虹[1] 史祖衡[1] 

机构地区：[1]西北工业大学机电学院

出　　处：《航空制造技术》2012年第17期79-82,共4页Aeronautical Manufacturing Technology

基　　金：国家自然科学基金(50875214;10672134;11072196)资助

摘　　要：建立了金属正交切削的热力耦合有限元模型,对难加工材料GH4169进行非稳态的干切削加工模拟,得到卸载后不同切削速度下工件表面应力场、温度场的分布。分析了不同切削速度下工件残余应力的分布规律以及对工件抗疲劳性能的影响。结果表明,随着切削速度的增大,工件表层的残余拉应力整体上呈现增大的趋势,但在表层迅速下降转化为压应力,并在100~140μm处出现峰值,然后逐渐减小,并且随着切削速度的增大压应力层有向内部深入的趋势,这有利于提高工件的抗疲劳性能,为高速干切削难加工材料的工艺研究提供了参考依据。A finite element model of thermal-mechanical orthogonal cutting process is established to simulate the unsteady cutting process of dry-cutting of the difficult-to-machine material GH4169 and the unloaded surface stress field and temperature field of different cutting speed are obtained. Then the distribution of residual stress and the effect of fatigue properties are analyzed. The results show that the tensile residual stress increases as the cutting speed increases, but decreases sharply and transforms to compressive stress, whose magnitudes is found at 100-140μm,which helps to improve the anti-fatigue properties and proves basis for cutting process of dry-cutting difficult-to-machine material.

关 键 词：干切削加工 难加工材料 残余应力 疲劳性能 

分 类 号：TG501.3[金属学及工艺—金属切削加工及机床]