Simultaneous optimization of WEDM parameters for CPOH steel by central composite design

Abstract

This study aims to determine the appropriate parameter levels during cutting process of CPOH steel by using Cut 300, a new wire erosion machine, in a company operating in defense and aviation sector. In the study, CCD (Central Composite Design) which is the frequently used type of RSM (Response Surface Methodology) was used for the optimization of SR (surface roughness) and CT (cutting time). According to the literature, it has been seen that the process parameters that may be effective in optimization are current, T_on, T_off and WFR (wire feed rate). Parameters having significant effect for response variables were determined by ANOVA. Prediction models were built by regression analysis and desirability function was used for simultaneous optimization of all responses. Optimized parameter levels were determined as current 22.69 (Amp), T_on 0.8 (µs), T_off 8.01 (µs) and 22.60 (mm /min) WFR. After conducting confirmation tests the responses Ra, Rz and CT were obtained 0.38 (µ), 2.23 (µ) and 10.84 (min), respectively. The results fall into the prediction interval ensure the model validation.