Generation of surface micro-topography in diamond turning

In order to predict and control the surface roughness before ultraprecision machining, a surface micro-topography simulation program is developed,a new surface micro-topography model based on cutting geometry with a round nose tool is proposed,in which the effects of tool geometry,machine tool vibration and minimum thickness of cut on surface characteristics have been considered. The correspondence between minimum thickness of cut and the tool edge radius can be found by the detailed theoretical analysis and experimental investigation,and factors influencing machined surface roughness are analyzed,a random motion is included into the theoretical analysis of surface generation in this program .The cutting tests are carried out on a specially designed submicro CNC ultraprecision turning machine, the results show that it is possible for us to predict the surface roughness by the new model .