Abstract
The present study is an extension of our previous work. Performance evaluation of single-layer AlTiN coating deposited by Scalable Pulse Power Plasma (S3p) and High Power Impulse Magnetron Sputtering (HiPIMS), with multi-layer TiN/TiAlN and AlTiN/TiAlN coating deposited by Cathodic Arc Evaporation (CAE) is carried out. Taguchi’s full factorial design with L9 orthogonal array was used for machining. AlTiN (S3p) coating exhibited a tool life of 111 min, 1.5 times as much as AlTiN (HiPIMS) coating. Multi-layer coatings could not offer comparable performance with single-layer coatings. Among the multi-layer coatings’ tools having the top layer of Al performed better. Surface roughness exhibited by AlTiN (S3p) tool was 1.2 µm compared to 1.8 µm by AlTiN (HiPIMS) tools. The rate of reduction of cutting force for AlTiN (HiPIMS) and AlTiN (S3p) tools was found to be 5% and 11%, respectively. Multi-layer TiN/TiAlN-coated tool exhibited 2.5 times higher surface roughness compared to single-layer AlTiCrN coated tool. Empirical models showed predictability of 5% and 20% for cutting force and surface roughness respectively. The higher predictability range for surface roughness is due to influence of both cutting speed and feed. The developed models can be used for selection among AlTiN (S3p) and AlTiN (HiPIMS) coated tools.
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