Machinability and Surface Integrity Characterization in Hard Turning of AISI 4320 Bearing Steel Using Different CBN Inserts

摘要: Abstract The thermomechanical interaction between the cutting tool and workpiece in any material removal process is a key factor defining efficiency productivity of process. It especially important hard-to-machine materials such as titanium- nickel-based alloys or hardened steels. can be defined terms machining time, intervals change (due to wear) surface integrity characteristics dimensional tolerances, roughness machining-affected zone. objective this work conduct comprehensive study performance three different industrial-grade CBN inserts during hard turning AISI 4320 case-carburized steel. all had same geometry but used edge preparation coating technologies. To quantify performance, forces wear were measured at consistent was characterized roughness, white dark layer depths, micro-hardness residual stresses. Results show that stability on two tested plays an role determining life (where 60% higher achieved compared other insert with unstable edge), force formation compressive stresses turned