Based on the field emission theory and resistance heating effect

the energy on workpiece surface in electrical discharge machining (short in EDM) process was modeled and its related parameters were analyzed in this paper

when the tool electrode is negative.The theoretical study and the analysis on the experimental data both show that

the resistance heating effect is the main mechanism of material removal of workpiece

and the concentration ratio of resistance heat to total work power increases with the improvement of interelectrode current and decrease with the enlargement of the discharge spot area.Moreover

the consistence of theoretical model and experimental results show that the established describing equatins of work energy are valid.