平面磨削条件下温度阈值对残余应力形成的影响

第50卷第3期中南大学学报(自然科学版) V ol.50No.3 2019年3月Journal of Central South University (Science and Technology)Mar. 2019 DOI: 10.11817/j.issn.1672-7207.2019.01.005

平面磨削条件下温度阈值对残余应力形成的影响

温俊1, 2，唐进元1, 2，郑金超1, 2

(1. 中南大学高性能复杂制造国家重点实验室，湖南长沙，410083；

2. 中南大学机电工程学院，湖南长沙，410083)

摘要：考虑平面磨削条件下的热力耦合作用，研究磨削温度阈值对残余应力形成的影响。基于热弹塑性理论，构建预测磨削热产生残余应力的计算模型；加载椭圆移动热源，使用COMSOL有限元软件进行热−弹塑性多物理场耦合计算，得到磨削区域温度场分布与不同磨削参数对工件表层产生初始塑性应变的影响，从而定量分析磨削温度与磨削残余应力间的相互关系；通过平面磨削实验测得磨削工件表面温度场及磨削后工件表层残余应力，并与数值计算结果进行对比分析。研究结果表明：磨削温度计算值与实测值相对误差在5%以内；磨削温度产生的初始塑性应变对最终残余应力场有较大影响；在一定磨削参数下，可以确定形成初始热塑性应变及残余拉应力的磨削温度阈值。

关键词：磨削温度；残余应力；热力耦合；磨削温度阈值

中图分类号：TH123.4 文献标志码：A 文章编号：1672−7207(2019)01−0530−10

Influence of plane grinding temperature threshold on

formation of residual stress

WEN Jun1, 2, TANG Jinyuan1, 2, ZHENG Jinchao1, 2

(1. State Key Laboratory for High Performance Complex Manufacturing, Central South University,

Changsha 410083, China;

2. School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China)

Abstract: With consideration of the thermo-mechanical coupling under the condition of plane grinding, the effect of grinding temperature threshold on the formation of residual stress was studied. Based on the thermo-elastoplasticity theory, a calculation model for predicting the residual stress generated by grinding heat was constructed. The elliptical moving heat source was loaded, and the thermo-mechanical multiphysics coupling calculation was performed using COMSOL finite element software. The temperature field distribution in the grinding region and the influence of the parameters on the initial plastic strain of the workpiece surface was obtained, and the relationship between the grinding temperature and the residual stress of grinding was quantitatively analyzed. The surface temperature field of the workpiece and the residual stress of the workpiece surface after grinding were measured by plane grinding experiment, and they were compared with the numerical calculation results. The results show that the error between the calculated and measured values of the grinding temperature is less than 5%, and the initial plastic strain generated by the grinding temperature has great influence on the final residual stress field. With certain grinding parameters, the grinding temperature threshold for initial thermoplasticity strain and residual tensile stress can be determined.

Key words: grinding temperature; residual stress; thermal−mechanical coupling; grinding temperature threshold

收稿日期：2018−03−10；修回日期：2018−05−22

基金项目(Foundation item)：国家自然科学基金资助项目(51535012，U1604255)；湖南省重点研发计划项目(2016JC2001) (Projects(51535012, U1604255) supported by the National Natural Science Foundation of China; Project(2016JC2001) supported by Key Research and Development Program of Hunan Province)

通信作者：唐进元，博士，教授，从事复杂齿面制造、超声磨削表面完整性研究；E-mail: jytangcsu@