Ti-6Al-4V钛合金高速切削锯齿化灵敏度仿真分析

Simulation Analysis of Serrated Degree Sensitivity in High Speed Machining of Ti-6Al-4V Titanium Alloy

为了研究高速切削Ti-6Al-4V钛合金时锯齿形切屑的形成过程,基于ABAQUS有限元分析软件建立了Ti-6Al-4V钛合金高速正交切削过程的有限元模型,应用Johnson-Cook材料本构模型和剪切损伤准则,对高速切削钛合金过程中锯齿形切屑的形态进行了模拟,并通过对比实验结果验证了模型的有效性。提出了锯齿化灵敏度分析方法,分析了切削工艺参数对切屑锯齿化程度的影响大小。研究结果表明,Ti-6Al-4V钛合金高速切削过程中切削速度对切屑锯齿化程度影响最大,刀具前角的影响次之,切削深度的影响最小,该研究有助于深入理解钛合金高速切削切屑形成机理。

To study the formation process of the serrated chip in high speed machining of Ti-6Al-4V titanium alloy, a finite element model of the high speed orthogonal cutting process of Ti-6Al-4V titanium alloy is established based on the finite element analysis software ABAQUS. The Johnson-Cook （JC） constitutive model and shear damage model are adopted to simulate the formation of serrated chip in high speed machi- ning of Ti-6Al-4V titanium alloy, and the effectiveness of the above-mentioned model is verified by the contrast analysis of the simulation and experiment. The analysis method of the serrated degree sensitivity is proposed to reveal the influence of the cutting parameters on the serrated degree of chip. The research results show that the cutting speed has the greatest influence on the serrated degree of a chip, followed by the influence of the rake angle of cutter, while the cutting depth has little impact on the serrated degree. This paper can help to give an insight into the serrated chip formation mechanism in high speed machining.