Study on Three-Dimensional Morphology of V-Notch Surface of 18CrNiMo7-6 Steel by Tangential Turning-Milling
Notch machining of fatigue specimens has always been a difficult problem to be solved urgently.A new notch cutting technology for tangential turning-milling was proposed,and the influence of tangential turning and milling on the surface morphology of V-notch was investigated by combining theory with experiment.The results show that the bottom of tangential turning-milling V-notch will show different processing texture directions under different process parameters;the angle between the texture direction and the axis of the workpiece calculated by the proposed theoretical formula has a small error with the actual result;the 3D surface roughnessRaof notch bottom decreases with the increase of milling speed n.,increases with the increase of workpiece speednwand decreases first and then increases with the increase of feed per tooth fz;the optimum parameter combination for surface roughness is nc=6 000 r/min,nw=100 r/min,fz=0.037 5 μm,with this combination of cutting parameters,the surface roughness Ra of V-notch can reach 0.075 µm.
tangential turning-millingV-notch3D surface roughnesstexture direction
万方数据
维普
