AHP Integrated TOPSIS Methodology for Selection of Non-Conventional Machining Process for Micro-Drilling

Selection of the most suitable machining process for micro-drilling is very crucial in precision machining. Manufacturing and dimensional errors can occur due to improper selection of machining methods. While making the decision for available processes for the best, ideology of the people may clash with each other. Analytical hierarchy process (AHP) is widely used for accessing the criteria weightage and prioritizing the decision-maker’s factors for the selection of best process. AHP has the ability to reconcile inconsistencies in the data. The technique for order of preference by the similarity of ideal solution (TOPSIS) is utilized for the final selection of micro-drilling process with calculated weightage from AHP. In the case study, AHP is considered for determining the criteria weights of each parameter. The parameters considered are hole-tolerances, operating voltage, depth, minimum diameter; surface roughness, and cost. For priority making performance rating values are organized in descending order. When machining processes are ranked according to their relative closeness to the ideal solution, the priority ranking is obtained as EDM>USM>EBM>LBM. suitable process for drilling hole of the smallest possible diameter and maximum possible depth is evaluated as EDM by AHP and TOPSIS methodologies.