Electrochemical drilling and multi response optimization using different methods of assigning weights to the responses for sustainable machining of AA6061-TiB2 in-situ composites

Abstract

The current paper describes the multiple response optimization of electrochemical machining (ECM) responses, such as specific energy consumption (SEC), overcut, and material removal rate (MRR), aimed at sustainable machining. The experimental work was conducted on electrochemical drilling of AA6061-TiB2 composite material. The concentration of electrolyte, applied voltage, and current were selected as the governing parameters in machining process. The Technique for Order of Preference by Similarity to the Ideal Solution (TOPSIS) was applied to identify the optimal set of machining parameters based on the closeness coefficient (CC). The weighting of responses was allotted by using the Analytical hierarchy process (AHP), or equal weights, or entropy method. The results indicate that the closeness coefficient varied by weighting. A comparative analysis of the confirmation experiments showed that the optimal level of machining parameters obtained from the entropy weighting method gave the largest improvement in the closeness coefficient to attain sustainable machining.

Keywords

• electrochemical machining
• in-situ composites
• sustainable machining
• multiple response optimization
• response weighting method