Optimization of EDM process parametrs on hard Ti alloys by using of Grey Taguchi technique

Abstract

In present industrial world modern machining process performs crucial role for economic development of the
country. EDM is one of such unconventional machining process to achieve products with high dimensional accuracy,
complicated shape and good quality. EDM is one where electrical sparks are generated by creating voltage difference
between the electrode and stationary work piece in dielectric fluid. The material removal takes place due to thermal
electric energy of the sparks which melts, evaporates and erodes the work material. EDM is used to machine super hard
materials which are not possible to machine in traditional machining processes. The main objective of the present work
is to optimize the process parameters to achieve high MRR and low surface roughness. The experiments are conducted
on Titanium Alloys Grade-2 and Grade-5 and the tool materials are copper, tungsten copper and graphite of each cross
sectional area 10X10mm2 and 70mm of length. Considering process parameters like pulse on time, duty cycle and
discharge current. The output process parameters like MRR and SR are determined for every experimental runs. Taguchi
L27 orthogonal array design is used to experimental design by Minitab17 software. Finally the multi-objective
optimization problem is solved by using Taguchi Grey Relational Analysis.