Optimizing The Process Parameters Of Electrical Discharge Machining On AA7075 - SiC Alloys

Abstract

Day by day many new materials are coming in to use due to continuous demand from the defense, aerospace and medical fields for machining intricate shapes. The traditional machining process cannot meet the requirement because of increased hardness and strength of new materials. Non-traditional methods are found to be suitable for these conditions. Technologies to improve the material rate and reduce the tool wear rate achieve the good surface finish and dimensional accuracy very in Electrical Discharge Machining (EDM). Electrical discharge machining is suitable for machining die steels, titanium and nickel matrix composites.In the present work, its proposed to check the performance of conventionally used copper electrode using kerosene as die-electric fluid in a Electrical discharge machining of AA7075 SiC Metal matrix composites.Experiments were conducted under different values of process input parameters like current, pulse on time, pulse of time and coating thickness. The Material removal rate (MRR), Tool wear rate (TWR),Relative wear ratio (RWR) and surface roughness (Ra) at different input parameters are measured. The corresponding output values are then optimized using Principal Component Analysis. Further Sensitivity was also carried out to identify the most influencing factors.