ABSTRACT
Machinability is a term usually employed to describe the material removal capability with an accepted finish at a relatively low cost. The study of the machinability of titanium alloy has been increasing and is acquiring more significance as it can produce a stress-free and high-quality surface. Machining titanium alloy is of interest to researchers for increasing its usability in industrial parts. It is difficult to machine alloy due to its favorable characteristics, such as preventing heat to pass through them, forming atomic bonds with the cutting tool material, and having high tensile strength. Metal-cutting scientists are working hard to overcome the difficulties and hence the associated temperatures and stresses generated during machining. The chapter deals with the machining performance evaluation of titanium biomaterial Ti6Al4V in computer numerical control (CNC) cylindrical turning using cubic boron nitride (CBN) insert. The analysis of machining forces, surface roughness, and tool wear is done by taking into consideration the workpiece machining length and acoustic emission (AE) characteristics, which are correlated with the machining conditions to monitor the condition of the CBN tool insert. It was found that the resultant cutting force values were low up to a 60-mm cutting length. The lowest surface roughness value, Ra, observed was 0.9 μm at a 15-mm cutting length, and the major flank wear on the flank face, VB, was observed 0.2 mm at a 30-mm cutting length. The AE signals were correlated with the number of passes, and it was found that there was a reduction in AE energy and AE count after four passes.
