Modeling and Experimental Investigation on Local Friction Coefficient of Tool-Chip Contact Interface

Friction characteristics at the tool-chip contact interface is one of the two main factors affected predictions. The value of friction coefficient which represent contact interface frictional characteristic is difficult to determine due to contact interface in metal cutting involves several complex physical phenomena and it's not a constant parameter for the contact behavior is locally different. This paper aims to identify a friction model to describe the friction coefficient at this interface during the dry cutting based on the stick-slip friction theory. The experiment approach used could reach relevant values of pressures and sliding velocities. Investigations were conducted for quenched and tempered AISI1045 steel in combination with uncoated high speed steel tools. A new friction model has been identified based on normal stress and sliding velocities. The experimental analysis shows change in different degrees caused by the varying of normal stress and sliding velocities.