Performance evaluation of process parameters using MCDM methods for Titanium Alloy (Ti6al4v) in turning operation

Titanium alloys are challenging to manufacture because the thin chips create a small surface area between the cutting tool and the workpiece. High cutting temperatures are a result of titanium alloys' inadequate heat conductivity and excessive stress created by the narrow contact area. This study focuses on the optimisation of the impact on tool life, surface roughness, crater wear, and flank wear. The process variables for turning Ti-6Al-4 V alloy take tool life, surface roughness, crater wear, and flank wear into consideration. Results were analysed using Taguchi-based SAW, VIKOR, TOPSIS, and Electre techniques. The outcomes of the experiment demonstrate that Ti-6Al4V alloy has been successfully turned using CIMCOOL 360 coolant with a 15% concentration. By selecting the best alternative at a cutting speed = 80 rpm, feed rate = 0.18 mm/rev, depth of cut = 0.12 mm, and a rake angle = 14 degrees, where the surface roughness and tool life are, respectively, 0.716 m and 48.3998 min, the research work shows the importance of the suitability of TOPSIS in solving the Multiple Criteria Decision-Making (MCDM). From the ANOVA results, for surface finish, it is noticed that the process parameter rake angle is having Rank 01 for all levels. Thus, the rake angle is the major influencing parameter to achieve a better quality of surface roughness. While in the case of flank wear it is crystal clear that the process parameter DOC is having Rank 01 for all levels. Thus, DOC is the most influencing parameter to achieve lesser flank wear and better quality of tool life.