Multi aspects optimization on spark erosion machining of Incoloy 800 by Taguchi Grey approach
N. Manikandan, Joseph Selvi Binoj, P. Thejasree, H. S. Abhishek, B. Karthik Goud
Abstract
Incoloy 800 is one among the difficult to machine nickel based superalloy and comprehensively used in high temperature environments. It has better strength and lower thermal diffusion that leads to deprived machining by traditional methods of machining. To overcome such kind of shortcomings, nontraditional approach of material removal processes have been developed and expected to be a suitable substitute method for traditional methods of machining. Wire Electrical Discharge Machining (WEDM) is one of the variant evolved from the perception of Electrical Discharge Machining process that is predominantly employed for machining of hard materials and also for making complex shaped components. In this study, an experimental study has been done on WEDM of nickel based superalloy and primarily focusing on optimizing the process variables for machining of Incoloy 800 by using Taguchi’s analysis. The experimental runs are planned by Taguchi’s DoE approach. The experiments have been performed by considering the process parameters such as pulse on time, pulse off time and peak current at three various levels. Material Removal Rate (MRR), Surface Roughness (SR) and Overcut (OC) are the desired performance measures considered in this present analysis. Taguchi’s analysis and Analysis of Variance (ANOVA) has been used to determine the significance and influence of independent variables on the desired dependent variables. Taguchi - Grey methodology has been adopted for the WEDM process and combination of process parameters are determined for obtaining improved multi performance characteristics. The performance of the selected machining processes has been improved by proposed approach.