TC17钛合金高速铣削参数对表面残余应力影响研究

摘要

为了获得高性能航空发动机用TC17钛合金材料高速铣削过程中铣削参数对残余应力的影响规律,采用单因素实验法,使用硬质合金刀具进行了高速铣削TC17钛合金实验,建立了铣削速度、每齿进给量和铣削深度对表面残余应力的影响关系,并对影响机理进行了分析。研究结果表明：硬质合金刀具高速铣削TC17钛合金时,冷塑形变形引起的残余压应力占主导地位;试件表面的残余压应力都随着铣削速度和每齿进给量的增加而降低,而随铣削深度的增大而增大。以低应力为目标,优选的铣削参数如下：vc=392 m/min,ap=0.15 mm,fz=0.05 mm/z。%In order to obtain the influence laws of milling parameters on residual stresses in the process of high speed milling of TC17 titanium alloy,a single factor experiment was designed in which the cemented carbide tools were used to cut the Titanium Alloy TC17.The relationships between milling speed,feed per tooth,milling depth and residual stresses are established,and the influence mechanisms are analyzed.The results show that compressive residual stresses caused by cold plasticity deformation on the machined surface play the leading role when TC17 is high-speed milled with carbide tool.The compressive residual stresses on machined surface decrease with milling speed and feed per tooth increasing,but increase with milling depth.Taking the low stress as the goal,the milling parameters can be optimized as vc=392 m/min,ap=0.15 mm,fz=0.05 mm/z.