CNC machined surface geometry including surface roughness, surface waviness and surface textures in several ways. Surface roughness surface geometry of the basic unit. Metal cutting tool when machining the surface, surface roughness is mainly influenced by geometrical factors, physical factors and the role of NC machining process of factor three and impact.
From a geometrical point of view, the shape and geometry of the tool, especially the corner radius, angle, the Deputy angle and feed on the surface roughness of the cutting has a greater impact.
(2) physical factors
From the physical essence of the cutting process to consider, the cutting edges of the cutter rounded and subsequent compression and friction causes metal plastic deformation, serious deterioration of surface roughness. CNC lathe material formed at the ribbon cutting, on the rake face easy to form high hardness of built-up edge. It can replace the front blade and cutting at the cutting edge, so that the geometry of the tool angle, the back knife changes. Built-up edge contour is irregular, which appears on the surface of the workpiece changing marks of both depth and width. Some built-up, into the workpiece surface and increase surface roughness. The vibration when cutting, workpiece surface roughness parameter value increase.
(3) technological factors
From the perspective of their impact on surface roughness degree of metal parts processing, there are factors associated with the cutting tool and the workpiece material-related factors and factors related to NC machining conditions.