Citation :

Vinh-Binh Bui, Xuan-Thao Dang, Hong-Son Nguyen, Nhu-Uyen Vo Thi, "Study on Material Removal Rate in EDM Of 9XC Steel," International Journal of Mechanical Engineering, vol. 13, no. 4, pp. 106-117, 2026. Crossref, https://doi.org/10.14445/23488360/IJME-V13I4P109

Abstract

The present work examines the effects of discharge current (𝐼𝑒) and ignition voltage (𝑈𝑧) on the rate of material removal (MRR, denoted as 𝑄) during EDM of 9XC alloy tool steel, a very high-hardness tool steel used for mould manufacturing. In this article, a 22 full factorial design was used to systematically study the effects of process variables on a CM 323C EDM machine. The tests were conducted on two parameters: ignition voltage (40–70V) and discharge current (2–8A); data processing was performed using MATLAB software. The results show that both are linear with MRR, but this implies that the discharge current has a much more dominant effect than the ignition voltage. In particular, an exponential regression model was formulated 𝑄=0.213⋅𝑈𝑧0.432⋅𝐼𝑒1.005 , which yielded a high Coefficient of Determination (𝑅2) of 0.944 when compared with the experimental results. The proposed model establishes a sound scientific foundation for determining optimal machining parameters to improve the productivity and quality of industrial EDM of alloy tool steels.

Keywords

Electrical Discharge Machining, 9XC alloy steel, Material Removal Rate, Design of Experiments.

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