中文摘要：

利用ABAQUS／Explicit有限元软件．建立了硬质合金刀具-Ti6Al4V钛合金正交切削有限元模型，并对Ti6Al4V钛合金正交切削过程进行了有限元模拟。基于对Ti6Al4V钛合金正交切削实验，通过对比试验及仿真的切削力以及切屑形态对有限元模型进行了验证。利用所建立的有限元模型研究了导热系数的改变对Ti6Al4V钛合金切屑形态、温度分布以及切削力的影响。结果表明：随着导热系数的增加，切削力逐渐增大。剪切区的温度逐渐降低，绝热剪切程度减小。证明了在Ti6Al4V钛合金切削过程中．工件材料较低的导热系数是导致在剪切区产生绝热剪切现象的重要原因。

英文摘要：

An orthogonal cutting finite element model was established based on the finite element software ABAQUS/ Explicit. The finite element model was validated by comparing the cutting force and chip morphology obtained by orthogonal cutting experiment. Based on the developed finite element model, the effects of the coefficient of thermal conductivity ofTi6Al4V titanium alloy on the chip morphology, temperature distribution and cutting force were investigated. The results show that with the increase of the coefficient of thermal conductivity, the cutting force increases gradually, the shear zone temperature decreases gradually, and the degree of adiabatic shear decreases. From what has been discussed above, it is found that poor heat conduction performance of Ti6Al4V titanium alloy is one of the most important reasons for adiabatic shear phenomena in the process ofTi6Al4V titanium alloy cutting.