PCD刀具高速铣削TC4钛合金的工艺参数优化

Optimization of process parameters for high speed milling TC4 titanium alloy with PCD tool

用PCD铣刀平面精铣TC4(Ti–6Al–4V)钛合金,再用三坐标测量机、表面粗糙度仪、显微维氏硬度计和便携式X射线残余应力分析仪测量钛合金加工后的平面度、平行度、表面粗糙度、表面硬度及表面残余应力,分析不同铣削工艺参数对TC4钛合金质量和表面形貌的影响。结果表明:在主轴转速16000 r/min,切削深度0.2 mm,每齿进给量0.06 mm/z的最佳铣削工艺参数下,PCD铣刀寿命较长,TC4钛合金工件的表面质量和形貌较好,其平面度为0.26μm,平行度为0.64μm,表面粗糙度为0.63μm,表面显微硬度为3080 N/mm2,表面残余应力为-250 MPa。

The TC4(Ti-6Al-4V)titanium alloy was plane milled precisely with PCD milling cutter.The flatness,the parallelism,the surface roughness,the surface hardness and the surface residual stress were measured by the coordinate measuring machine,the surface roughness meter,the micro Vickers hardness meter and the portable X-ray residual stress analyzer.The influences of different milling parameters on the quality and the surface morphology of TC4 titanium alloy were analyzed.The results show that with the optimal milling process parameters of spindle speed of 16000 r/min,cutting depth of 0.2 mm and feed per tooth of 0.06 mm/z,the PCD milling cutter has a long life,and the TC4 titanium alloy workpiece has good surface quality and morphology.The flatness,the parallelism,the surface roughness,the microhardness and the residual stress of the workpiece are 0.26μm,0.64μm,0.63μm,3080 N/mm2 and-250 MPa,respectively.