Super hard high quality metal grinding discdressing Trimming is the general term for shaping and sharpening. Shaping is the geometry that makes the high quality metal grinding disc have the required precision. The sharpening is to remove the bonding agent between the abrasive grains, so that the abrasive particles protrude from the bonding agent to a certain height, forming a good cutting edge and sufficient chip space. The shaping and sharpening of the superabrasive grinding wheel are divided into two steps. The method of superabrasive grinding wheel dressing is summarized in the following categories: 1 turning method; 2 grinding method; 3 rolling pressing method; 4 spraying method; 5 electric machining method; 6 ultrasonic vibration trimming method.