Effect of tool wear on roughness in hard turning

This paper attempts to make a contribution to wear estimation of CBN tools when turning hardened steels. It is well known that cutting edge geometry deteriorates with wear. Although many authors have considered tool wear process has a random nature, detailed tool examination has proved that wear has some deterministic features in these processes. Thus, plastic deformation exists in the early stages while gradual abrasion makes the cutting edge recede. On the other hand, it has also been found that there is a good replication of the tool on the roughness profile. Therefore, cutting edge state might be predicted with reasonable accuracy through roughness parameters. This strategy allows fast tool wear estimation by simple roughness measurements using a shop floor instrument.