Comparative Study of Some Machining Characteristics During Hard Turning of Alloy Steel with Untreated and Cryotreated Cermet Inserts

Abstract

Extended tool life of cutting inserts is most suitable condition for higher productivity of a manufacturing industry. Several methods are found and employed for higher tool life of cutting inserts among which cryogenic treatment is considered as the most significant method but no adequate researches have been found concerning the impact of cryogenic treatment on cermet inserts especially in hard turning operation. Hence, in the current experimental investigation, the comparative assessment of various responses such as flank wear, crater wear, chip morphology, friction coefficient and chip compression ratio were carried out during machining of hardened steel with both untreated and cryotreated cermet inserts under dry cutting condition. The hard turning operation was accomplished according to Taguchi’s L9 orthogonal array. The experimental result demonstrated that the uncoated deep cryotreated with tempered cermet insert delivered better results in comparison to other cermet inserts because of better wear resistance, micro-hardness, and toughness.