损伤演化对Ti6Al4V高速切削仿真结果的影响  

Effects of damage evolution on simulation results of high speed machining of Ti6Al4V

作　　者：杜茂华[1] 程正 王神送[1] 张雁飞 DU Maohua;CHENG Zheng;WANG Shensong;ZHANG Yanfei(Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology,Kunming 650500 , China)

机构地区：[1]昆明理工大学机电工程学院

出　　处：《航空学报》2019年第7期274-286,共13页Acta Aeronautica et Astronautica Sinica

基　　金：国家自然科学基金(61562055)~~

摘　　要：利用ABAQUS有限元分析软件建立了Ti6Al4V二维切削仿真模型,在模型其他参数(本构参数、初始损伤参数等)固定不变时,得到了不同损伤演化特征参数(断裂能)取值下的切削力、切削温度和切屑形貌,以此来研究损伤演化过程对仿真结果的影响。研究发现随着断裂能取值的减小,仿真的切削力、切削温度会降低,切屑的锯齿化程度会变得严重。在切削速度为180m/min,进给量为0.1mm/r的条件下进行了Ti6Al4V正交切削实验,测量了切削力,将仿真得到的主切削力和切屑锯齿化程度与实验结果进行对比,确定了适合本研究建立的仿真模型的合理断裂能值。结果表明,在使用此断裂能取值时,仿真得到的切削力和切屑形态与实验值有很好的一致性。在消除了能量密度对仿真模型的影响后,进行了4组验证实验,仿真结果与验证实验的结果相吻合,证明了断裂能取值的准确性。Based on the finite element analysis software ABAQUS,a two-dimensional cutting simulation model for Ti6Al4V is established.In order to investigate the effects of the damage evolution process on the simulation results,the cutting force,cutting temperature,and chip morphology under different damage evolution characteristic parameters(fracture energy)are obtained when the other model parameters(constitutive parameters,initial damage parameters,etc.)are fixed.The research finds that the simulated cutting force and the cutting temperature decrease with the decrease of value of the fracture energy.making the serrated degree of the chip severer.The orthogonal experiments of machining Ti6Al4V are carried out to measure the cutting force at the cutting speed of 180 m/min and feed rate of 0.1 mm/r.By comparing the simulated main cutting force and the serrated degree of the chip with the experimental results,the reasonable value of fracture energy suitable for the established simulation model is determined.The results show that the cutting force and the chip geometry obtained by simulations are in good agreement with the experimental values when the reasonable fracture energy value is used.After eliminating the effects of energy density on the simulation model,four sets of validation experiment are conducted.The simulated results are consistent with the experimental results of the verification experiments,and the accuracy of the fracture energy values is verified.

关 键 词：TI6AL4V 高速切削 损伤演化 断裂能 锯齿化程度 

分 类 号：V252[一般工业技术—材料科学与工程]