Abstract: The paper deals with a very effective technological solution to improve characteristics of electrodischarge machining (EDM). As it is known, although EDM has attained high performances regarding accuracy and surface quality, it is room for improvement mainly concerning machining rate. Starting from the basic specific phenomena characterizing this combined nonconventional machining, aspects related to equipment, technology and obtained microgeometry parameters are presented.

Key words: EDM, ultrasonics, machining rate, volumetric relative wear, microgeometry.