An experimental investigation on the influence of coating material on the machining characteristics of cutting tool inserts

Abstract

The need for productivity improvement of manufacturing industries leads to advancements in design and development of cutting tools Layer depositions on cutting tool insert is one of the important approaches in improving friction and wear resistance properties for machining applications The selection of coated tool with proper deposition method is of prime concern to overcome the challenges of machining processes The research study attempts to evaluate the performance of different coated inserts during machining of AISI 1015 steel Single layer TiAlN TiCN Bilayer TiAlN WC C and Multilayer TiCNTiAlNWC C were deposited on the CNC turning tool inserts by adopting physical vapour deposition Cathodic arc Evaporation process technique TiCN possess high hardness than pure tool owing to the presence of hard carbo nitride hence it was deposited as first layer on cutting tool Hard WC-C thin film was coated as top layer To enhance bonding between two hard layers an intermediate soft layer TiAlN was introduced However TiAlN coated tool possesses better hardness than uncoated tool Tribological characteristics of coated tool inserts were analysed with respect to uncoated tools XRF analysis proves the formation of coating on the tool inserts Dry sliding wear and friction tests were performed on pin on disc tribometer All the deposited coatings were tested at three different sliding speeds 10 ms 15 ms 25 ms under three different loads 5 N 10 N and 15 N against silicon carbide sliding partner for the run time duration of 1200 s Hardness and surface roughness of coatings were characterized by Vickers micro hardness tester and surface roughness tester Higher hardness 2583 GPa and lower surface roughness 0219 and#956;m is the main reason for augmented performance of multi-layered tool in tribo tests The result showed that multilayer coated tool depicts 21767 percentge improvement in wear resistance. newline