钛合金零件钻削过程仿真与试验研究

Simulation and experimental study on drilling process of titanium alloy parts

钛合金被广泛用于航空工业中,譬如民用飞机吊挂滑轨等典型结构的制造。钛合金作为难加工材料,通常使用钻削的方法进行加工,不同的钻削参数对应不同的钻削温度和钻削力,而钻削温度和钻削力对加工精度影响较大。为使加工参数和加工精度得到很好地匹配,借助Deform 3D有限元仿真软件建立了钛合金热应力耦合有限元模型,通过软件仿真研究钛合金滑轨在加工过程中的钻削力以及钻削温度。首先,对钻头和钛合金试件进行网格划分。其次,建立材料本构模型和切屑分离标准,使用仿真软件得到加工过程的钻削力和钻削温度。最后,采用试验方法获取钻削温度和钻削力,与仿真结果进行对比。结果表明:仿真结果与试验较为吻合,仿真能输出有效的钻削力和钻削温度。

Titanium alloy is widely used in aviation industry,such as the pylon track of typical structures for civil aircraft.Titanium alloy as a difficult materials,is usually processed by drilling.Different drilling parameters correspond to different drilling temperature and drilling force,while drilling temperature and drilling force have great influence on machining precision.In order to match the drilling parameters with machining precision well,the software named Deform 3 D was used to establish a finite element model of titanium alloy thermal stress coupling,and simulate the drilling force and drilling temperature during the machining process.Firstly,the drilling bits and titanium alloy samples were meshed.Secondly,the constitutive model and breakaway criterion of titanium alloy material were established,and the drilling force and temperature were obtained by simulation software.Finally,the drilling temperature and drilling force were obtained by test,and compared with the simulation results.The results show that the simulation results are in good agreement with the experiment,the error is within 15%,and the simulation can provide effective drilling force and drilling temperature.