Tungsten steel knife sharpening method: Tungsten steel knife is a cemented carbide drill bit, which is commonly used in the impact drill of home decoration drill wall. The head of the drill bit is brazed with a small piece of cemented carbide, and the drill handle is medium carbon steel.

　　Sharpening method: Grinding (light green) cemented carbide with a silicon carbide grinding wheel can grind a very sharp edge. Corundum grinding wheels (light cyan or white) are not suitable for grinding cemented carbide, which is more laborious. When grinding, stand on the left side facing the grinding wheel, and keep the main cutting edge on the side of the drill level and slightly higher than the horizontal plane passing through the center of the grinding wheel. If the main cutting edge is not kept level or lower than the horizontal plane of the center of the grinding wheel, main cutting will occur. Incorrect blade shape or high flank surface defect. Maintain the correct included angle between the axis of the drill bit and the circumferential grinding surface of the grinding wheel (half of the 120° top angle of the drill bit).