TA19钛合金车削表面非均匀残余应力场的构建方法  

Construction Method of Non-uniform Residual Stress Field on TA19 Titanium Alloy Turning Surface

作　　者：石耀闻 杨吟飞[1] 丁小岑 鲍璐 SHI Yaowen;YANG Yinfei;DING Xiaocen;BAO Lu(College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;School of Mathematical Sciences,Nanjing Normal University,Nanjing 210023,China)

机构地区：[1]南京航空航天大学机电学院,江苏南京210016 [2]南京师范大学数学科学学院,江苏南京210023

出　　处：《机械制造与自动化》2022年第3期44-47,共4页Machine Building & Automation

基　　金：国家科技重大专项(2017-Ⅶ-0001-0094);国家自然科学基金项目(52075251)。

摘　　要：为了表征车削加工表面残余应力的非均匀状态,提出一种残余应力场的非参数构建方法。采用X射线残余应力分析仪对断续车削表面的残余应力进行测量,利用局部线性地理加权回归方法建立表面应力分布的空间变系数模型,并通过残差分析方法将空间变系数模型与多项式模型和高斯模型的应力拟合结果进行比较。结果表明:局部线性地理加权回归方法建立的空间变系数模型拟合精度较高,适用于加工表面非均匀残余应力场的构建。A non-parametric construction method of residual stress field was proposed to characterize the non-uniform state of residual stress on the turning surface.An XRD stress tester was applied to measure the residual stress of the intermittent turning surface.By local linear geographic weighted regression method,a spatial variable coefficient model of the surface stress distribution was established,and through the residual analysis,the fitting results of the spatial variable coefficient model with the polynomial model and the Gaussian model were compared.The results show that the spatial variable coefficient model established by the LL-GWR method has high fitting accuracy and is suitable for the construction of the non-uniform residual stress field on the machined surface.

关 键 词：TA19钛合金 切削加工表面 非均匀残余应力场 空间变系数模型 局部线性地理加权回归 

分 类 号：TG506[金属学及工艺—金属切削加工及机床]