Study on the topography of the surfaces machined by micro-EDM

In order to study the influence of the processing parameters on the topography of the surface machined by micro-EDM, the main factors that affect the topography are first analysed theoretically. Then the experiment is carried out on the micro-EDM system composed of multifunctional micro non-traditional machine tool and RC pulse power supply with different parameters. The SEM photos of machined samples are taken, and according to these photos, the topographies of the surface machined in different parameters are compared. The conclusion is that the discharge craters will ascend with the increase of the voltage and capacitance. When the single pulse energy is same but the combinations of the voltage and capacitance are different, the experimental result shows that the size of the discharge craters depends on the single pulse energy, which is coincident with the theoretical analysis. The plainness of the surface machined with different voltage is measured and analysed.