Experimental Study on Surface Integrity of Titanium Alloy Machined by Prestressed Abrasive Belt Grinding
-
摘要: 为了提高钛合金加工表面的抗疲劳性和抗腐蚀性,基于预应力砂带磨削原理,进行不同预应力条件(0、100 MPa和200 MPa)下的钛合金砂带磨削试验。通过检测、分析不同预应力条件下磨削后工件的表面完整性,获得不同预应力对工件表面残余应力、粗糙度、硬度及表面形貌的影响规律;并在砂带磨粒模型的基础上,揭示预应力砂带磨削对残余应力和表面形貌的作用机理。结果表明:在材料的弹性范围内施加预应力并进行磨削能够主动加强工件表面的残余压应力状态;随着预应力的增加,残余压应力的大小呈现逐渐递增的趋势;预应力砂带磨削对表面硬度的影响甚小,且在一定范围内不随预应力的变化而变化;采用预应力砂带磨削能够得到较好的表面形貌,但会使粗糙度有微量增加。Abstract: In order to improve the fatigue resistance and corrosion resistance of titanium alloy, the tests of abrasive belt grinding of titanium alloy are conducted on different prestressed conditions(0,100 MPa and 200 MPa)based on the principle of prestressed abrasive belt grinding. On different prestressed conditions, the influence rules of the residual stress, surface roughness, hardness and surface topography of the workpiece are obtained by testing and analyzing the surface integrity of the workpiece. Based on the model of abrasive belt grain, the mechanisms that prestressed abrasive belt grinding affects the residual stress and surface topography are revealed. The research shows that, within the elastic deformation limit of titanium alloy, the condition of compressive residual stress on surface of workpiece can be actively strengthened by applying prestress. The larger the magnitude of prestress is, the larger the compressive residual stress. The influence of prestressed abrasive belt grinding on the surface hardness is insignificant, and the surface hardness does not change with prestress. The workpiece machined by prestressed abrasive belt grinding can obtain good surface topography but there is slight increase in roughness.
-
Key words:
- prestress /
- abrasive belt grinding /
- titanium alloy /
- surface integrity
-
[1] 张喜燕,赵永庆,白晨光.钛合金及应用[M].北京:化学工业出版社,2005 Zhang X Y, Zhao Y Q, Bai C G. Titanium alloy and application[M]. Beijing:Chemical Industry Press, 2005(in Chinese) [2] Kumar N, Shukla M. Finite element analysis of multi-particle impact on erosion in abrasive water jet machining of titanium alloy[J]. Journal of Computational and Applied Mathematics, 2012,236(18):4600-4610 [3] Che-Haron C H, Jawaid A. The effect of machining on surface integrity of titanium alloy Ti-6%Al-4%V[J]. Journal of Materials Processing Technology, 2005,166(2):188-192 [4] Zhang J K, Wang X Y, Paddea S, et al. Fatigue crack propagation behaviour in wire+arc additive manufactured Ti-6Al-4V:effects of microstructure and residual stress[J]. Materials & Design, 2016,90:551-561 [5] Stephens R I, Fatemi A, Stephens R R, et al. Metal fatigue in engineering[M]. New York:John Wiley and Sons, Inc., 2001:243-266 [6] 黄云,黄智.现代砂带磨削技术及工程应用[M].重庆:重庆大学出版社,2009 Huang Y, Huang Z. Modern abrasive belt grinding technology and application in engineering[M]. Chongqing:Chongqing University Press, 2009(in Chinese) [7] 胡华南,周泽华,陈澄洲.预应力加工表面残余应力的理论分析[J].华南理工大学学报(自然科学版),1994,22(2):1-10 Hu H N, Zhou Z H, Chen D Z. A theoretical analysis of the residual stress in pre-stressed machining[J]. Journal of South China University of Technology (Natural Science), 1994, 22(2):1-10(in Chinese) [8] 刘德福,于晓霞.预应力磨削工件表面残余应力的有限元分析[J].长沙铁道学院学报,2000,18(1):48-52 Liu D F, Yu X X. A finite element analysis of the residual stress in the pre-stressed grinding workpiece surface layer[J]. Journal of Changsha Railway University, 2000,18(1):48-52(in Chinese) [9] 布光斌,程足发,左敦稳,等.拉紧条件下铝合金铣削残余应力的试验研究[J].南京航空航天大学学报,2005,37(S1):21-25 Bu G B, Cheng Z F, Zuo D W, et al. Experiment on residual stress of milling-machined aluminum alloy under stretched fixation[J]. Journal of Nanjing University of Aeronautics & Astronautics, 2005,37(S1):21-25(in Chinese) [10] 叶邦彦,彭锐涛,唐新姿,等.预应力硬态切削的残余应力及表面形态[J].华南理工大学学报(自然科学版),2008,36(4):6-9 Ye B Y, Peng R T, Tang X Z, et al. Residual stress and surface morphology of pre-stress hard cutting[J]. Journal of South China University of Technology (Natural Science Edition), 2008,36(4):6-9(in Chinese) [11] 彭锐涛,伍佳易,唐新姿,等.预应力切削钛合金的有限元分析[J].机械科学与技术,2013,32(7):950-954 Peng R T, Wu J Y, Tang X Z, et al. Finite element analysis of prestressed cutting of titanium alloy[J]. Mechanical Science and Technology for Aerospace Engineering, 2013,32(7):950-954(in Chinese) [12] 米谷茂.残余应力的产生和对策[M].朱荆璞,邵会孟,译.北京:机械工业出版社,1983 Yoneya S. The appearance and solutions of residual stress[M]. Beijing:China Machine Press, 1983(in Chinese) [13] 邓朝晖,刘改,刘禄祥,等.强力砂带平面磨削工件表面残余应力的研究[J].湖南大学学报,1995,22(6):65-69,80 Deng Z H, Liu G, Liu L X, et al. Study on residual stress in surface layer of powerful belt surface grinding[J]. Journal of Hunan University, 1995,22(6):65-69,80(in Chinese) [14] 彭锐涛.预应力硬态切削加工的有限元数值模拟及实验研究[D].广州:华南理工大学,2008 Peng R T. Finite element numerical simulation and experimental study of pre-stress hard cutting[D]. Guangzhou:South China University of Technology, 2008(in Chinese) [15] Pazos L, Corengia P, Svoboda H. Effect of surface treatments on the fatigue life of titanium for biomedical applications[J]. Journal of the Mechanical Behavior of Biomedical Materials, 2010,3(6):416-424 [16] Zarudi I, Zhang L C. Mechanical property improvement of quenchable steel by grinding[J]. Journal of Materials Science, 2002,37(18):3935-3943
点击查看大图
计量
- 文章访问数: 218
- HTML全文浏览量: 34
- PDF下载量: 5
- 被引次数: 0