The results show that the gas spark discharge is started by the breakdown

Gas medium is a green discharge machining process, so that the processing method by domestic and foreign scholars in the field of EDM research attention, EDM research in the field is one of the hotspots. Spark discharge mechanism for gas conducted in-depth research. The results show that the gas breakdown spark discharge is started, and gradually developed into the streamer breakdown formed; gas discharge  Abrasive grinding  than the liquid discharge channel expansion fast; gas discharge process galvanic corrosion products mainly thrown by thermal explosive, high-pressure air blowing force, the magnetic hydrodynamic result of joint action, and for brittle materials, thermal stress erosion plays a dominant role. Single pulse for a spark discharge gas experiment results show that the positive polarity  cubic boron nitride  the workpiece on a single pulse discharge pit ratio to be negative when processing large, and the positive polarity monopulse processing anode is higher than the cathode erosion amount of erosion; compressed air discharge medium single pulse discharge pits  cutting tools  air of the single pulse discharge pits should be large, and the shape of the discharge pits due to airflow blowing action extends along a certain direction; gas both the single pulse discharge pit with the increase of discharge energy.