According to the machining requirements of high efficiency and low damage of silicon nitride ceramic rotary surface parts,an electrolytic in-process dressing(ELID)grinding experiment device is designed,which is suitable for rotary surface machining.Pre-dressing experiment is carried out on CNC coordinate grinder.Based on the parallel electrode electrolytic cell model,a model of the relationship between pre-dressing time and oxide film thickness is established,and the influence of the duty cycle and the pole...