基于微刃效应的不锈钢加工表面残余应力分布研究  

Effect of Tool Edge Radius on Residual Stress Distribution on Machined Surface of AISI 304 Stainless Steel

作　　者：叶波 刘超 周胜强 代星 Ye Bo;Liu Chao;Zhou Shengqiang;Dai Xing(AECC South Industry Company Limited;HUST-Wuxi Research Institute)

机构地区：[1]中国航发南方工业有限公司 [2]华中科技大学无锡研究院

出　　处：《工具技术》2023年第8期31-36,共6页Tool Engineering

基　　金：国家自然科学基金面上项目(51975237)。

摘　　要：针对刀具微刃半径对正交切削AISI 304不锈钢在分段切屑形成时加工表面残余应力分布的影响进行探讨,并在ABAQUS/Explicit中建立耦合欧拉—拉格朗日模型(CEL),分析刀具微刃变化时沿切削速度方向的残余应力分布和切屑形貌的变化,通过不同微刃半径的正交切削实验所得到的表面残余应力和切屑形态验证了数值模型的准确性。结果表明,微刃半径越大,切屑的分割程度越大;由于锯齿状切屑的形成,导致已加工表面的残余应力呈周期性分布,并且振幅随着微刃半径的增加而增加。The main purpose of this study is to explore the effect of tool edge radius on residual stress distribution of machined surface in orthogonal cutting AISI 304 stainless steel when the segmented chip is formed.A Coupled Eulerian-Lagrangian(CEL)is established in ABAQUS/Explicit to analyze the distribution of residual stress along the cutting direction and the change of chip morphology when the tool edge radius changes.The accuracy of the numerical model is verified by orthogonal cutting experiments with different edge radii.The results show that the larger the edge radius is,the greater of the degree of segmentation of the chip is.Due to the formation of segmented chips,the residual stress of machined surface is periodically distributed and the amplitude increases as the edge radius increases.

关 键 词：微刃半径 残余应力 CEL模型 切屑形态 

分 类 号：TG506.71[金属学及工艺—金属切削加工及机床] TG703[机械工程—机械制造及自动化] TH164