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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。
A finite element model of carbide cutting tool-Ti6Al4V titanium alloy was established by using ABAQUS / Explicit finite element software. The orthogonal cutting process of Ti6Al4V titanium alloy was simulated by finite element method. Based on the orthogonal experiment of Ti6Al4V titanium alloy, the finite element model was verified by comparing the cutting force and the chip shape of the simulation. The effect of thermal conductivity on the chip shape, temperature distribution and cutting force of Ti6Al4V titanium alloy was studied by using the finite element model. The results show that as the thermal conductivity increases, the cutting force gradually increases, the temperature in the shear zone decreases and the adiabatic shear decreases. It is proved that the lower thermal conductivity of the workpiece material during the cutting process of Ti6Al4V titanium alloy is the important reason for the adiabatic shear phenomenon in the shear zone.