The Material Removal Rate of AISI H13 Tool Steel in the Roughing EDM Process with Mixing Powder: Influence Analysis and Optimization of Major Process Parameters

In powder-mixed electric discharge machining, the evaluation of material removal rate (MRR) in the finishing, semi-finishing, and roughing processes of the electrical parameters is of great importance in the field of machining science. Therefore, this study investigated the MRR of AISI H13 tool steel in the roughing process by EDM with tungsten carbide powder to clarify the effect of electric parameters and the concentration of tungsten carbide powder on MRR. This has implications in machining science. Based on the response surface method to form an experimental matrix and build a relationship model between process parameters such as peak current (Ip), pulse on time (Ton), and powder concentration (Cp) with MRR. The full regression equation was used to analyze the influence of variables on MRR by the ANOVA method. In addition, this study also found the optimal technology mode to achieve the largest MRR.