航空钛合金高速切削有限元建模

Finite element modeling of Ti6Al4V alloy high speed cutting

为了正确模拟钛合金Ti6Al4V高速切削过程中锯齿状切屑形成的过程,深入研究有限元建模过程中有限元模型的建立、材料本构关系、切屑分离准则、材料失效准则、切削热动态耗散与热传导等关键技术.结合实例,分别采用热力耦合分析和绝热分析对钛合金Ti6Al4V的加工过程进行正交切削有限元模拟.通过对2种模型获得的应力分布、温度分布、切削力曲线进行分析,以及将2种模型获得的锯齿状切屑与实际切屑形状进行对比,证明了绝热剪切是导致高速切削钛合金生成锯齿状切屑的原因.

In order to correctly simulate the segmented chip formation of titanium alloy Ti6Al4V during high speed cutting,the key techniques of finite element modeling were investigated,which included establishing the finite element model,the material constitutive relation,the chip separation criteria,the material failure criteria,the heat dissipation and conduction. A high speed cutting case of titanium alloy Ti6Al4V was simulated with the thermal mechanical coupled analysis and the adiabatic analysis,respectively. Then the stress distribution,the temperature distribution and the cutting force curve were achieved. The comparison of the two simulation results shows that the segmented chip is formed because of the adiabatic shear.