dc.description.abstract | This research discusses the effect of negative rake angle, to the
temperature and tool wear on rock cutting. The cutting process
was conducted on marble rock material, without coolants and
utilized tungsten carbide inserts with 0o
, -5
o
, -10o
, -15o
, -25o
, -
30o and -40o rake angles; meanwhile, the feed rate, spindle
speed and depth of cut were applied constantly. Temperature
measurement used K-type thermocouples, and the scanning
electron microscope observed the tool wear. The data
collection was monitored in real time from initial conditions
until cutting 150 mm in length. The tool wear data was
observed after the turning process of 150 mm in length. The
results show that at negative rake angle -25o produce the
smallest temperature and tool wear compared to other
negative rake angles. This phenomenon occurs because the
cutting mode changes from brittle cutting mode to ductile
cutting mode. The pile of chip powder in front of the cutting
tool was implemented to protect the cutting tool from direct
friction with the workpiece and enhance thrust force on the
surface of the marble rock. It would greatly affect the cutting
temperature and tool wear. | en_US |