High quality standards must be reached during the high precision
hard turning process. In case of the interrupted turning the
instantaneous force fluctuation causes a vibration which causes
poor surface quality.
A dynamical model of the hard turning process was built to
describe this phenomenon and to analyse the effects of the
machining process parameters. Surface pattern and the surface
error were also calculated. Optimal cutting velocities were
found analytically, where the surface error is minimal.
Cutting tests were carried out to validate the mechanical model.
Uddeholm Rigor tool steel material was selected for the material
of the specimens. The material was hardened in its whole
section. Experiments were carried out on a Slantbed-Mikroturn 50
CNC lathe with CCMW09T304S-L0-B CBN050C SECO insert. During the
measurements the vibrations were detected by accelerometers and
analyzed by Pulse software. Using the measured signal we created
the surface profile of the machined workpiece. The surface
pattern was the same as the predicted. The measured surface
roughness was in a good agreement with the analytical ones which
validated our dynamical model.
