Patent ID: 7677145

Claim:
A round cutting insert for the machining of a workpiece, such as for the first-time machining and/or re-profiling of a wheel of a wheel set of a railway vehicle, said round cutting insert comprising: a longitudinal axis; a first circular end face comprising a diameter and a substantial flat portion being perpendicular to said longitudinal axis; a second circular end face comprising a diameter; second circular end face being disposed opposite said first circular end face; a first round cutting edge comprising a diameter; said first round cutting edge being disposed adjacent said first circular end face; a second round cutting edge comprising a diameter; said second round cutting edge being disposed opposite said first round cutting edge and being disposed adjacent said second circular end face; said side face comprising a plurality of cross-sections perpendicular to the longitudinal axis of said cutting insert; said plurality of cross-sections being circular; said first circular end face and said side face forming said first round cutting edge; said second circular end face and said side face forming said second round cutting edge; said side face having a first portion being disposed adjacent said first circular end face and also being disposed adjacent said first round cutting edge; said first portion of said side face adjacent said first circular end face forming an acute angle with said substantial flat portion of said first circular end face, which acute angle is disposed adjacent said first round cutting edge to form a positive clearance angle of said first round cutting edge; said side face having a second portion being disposed adjacent said second circular end face and also being disposed adjacent said second round cutting edge; and said second portion of said side face adjacent said second circular end face forming an acute angle with said substantial flat portion of said second circular end face, which acute angle is disposed adjacent said second round cutting edge to form a positive clearance angle of said second round cutting edge.