Generation of surface micro-topography in diamond turning

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