Grinding medium with U-shaped pits and manufacturing method thereof

The invention discloses a grinding medium with U-shaped pits and a manufacturing method thereof. The grinding medium with the U-shaped pits is characterized in that each U-shaped pit capable of enlarging contact areas among materials and the grinding medium is formed on the surface of a grinding medium body; the U-shaped pits in different columns of the grinding medium are distributed in parallel; and the U-shaped pits in the same column are distributed at equal distances. The manufacturing method comprises the following steps of: pressing electrolyte into a sealed capillary, jetting the electrolyte to a workpiece from the end of the capillary in a high speed, and loading voltage on an anode of the workpiece and a cathode of a clamp so as to realize machining of the workpiece. According to the grinding medium with the U-shaped pits, the contact areas among the materials and the grinding medium are enlarged, so that the impact action of the grinding medium on the materials is obviously improved, and the workin