Cathode device suitable for high-speed ELID grinding

The utility model relates to a cathode device suitable for high-speed online electrolyte sharpening and grinding, which is provided with a cathode cavity body 4 with a binding post 3 and the top of the cathode cavity body is provided with an insulation cover plate 2. The upper part of the cathode cavity body is provided with an electrolyte filling opening 1, and a circular arc part at the lower part of the cathode cavity body has three bar-shaped square holes 9. The cathode device is composed of the circular arc part and two baffle plates 5, 10, wherein the baffle plates 5, 10 are respectively fixed and installed on corresponding front and back sides of the cathode cavity body 4 and the bottom of the cathode device is provided with an opening. The opening of the bottom of the cathode cavity body is provided with a flexible covering chip 8 with a corresponding opening groove 11, and both sides of the opening are respectively provided with a press plate 6. The width of the opening groove 11 of the flexible covering chip 8 is the same as the width of a sharpened grinding wheel or a little bit smaller than the width of the sharpened grinding wheel is better, and the distance between two press plates 6 is wider than the width of the opening groove 11. The utility model realizes high-speed online electrolyte sharpening and grinding effectively, the surface of a grinding wheel forms a compact and continuous oxide film, the quality of grinding surface of a work piece is improved and the grinding force is reduced.