Study on the discharge energy distribution in micro EDM
Micro EDM technology has been widely used in the field of precision manufactur-ing.However,due to the existence of scale effect,its machining mechanism is particularly complex.The distribution of discharge energy during the EDM process has not been clari-fied.The micro single pulse electrical discharge experiment was carried out,and the tradi-tional electrical heating model was modified considering the influence of the melting latent heat and the vaporization latent heat.Based on the discharge duration of the micro EDM,the energy ratio distributed to the workpiece was calculated.The results show that the energy fraction distributed to the workpiece increases with the increase of the discharge duration be-cause a considerable part of the discharge energy is consumed by the formation of the dis-charge channel at the initial stage of spark discharge.When the discharge duration is 0.63-20.5 μs,the discharge energy fraction distributed to the workpiece is 7.1%—16.3%.With the continuous increase of the discharge duration,the discharge plasma channel radius would increase to a certain extent,and the variation range of the discharge plasma channel radius with the discharge duration is 5.9-23.2 μm.
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