CBN tool is mainly used for foreign hard materials and other difficult processing of finished materials, cutting margin is small. So the tool wear is mainly in the back of the tool and the tip. At the same time, because the CBN tool is hard and brittle, it is easy to cause cutting edge in the processing. Edge cutting edge phenomenon is the common form of tool damage to tool chipping phenomenon, for example, 20, grinding flank face, t = = 13m / s, ap = 0.01mm; Finally grinding with grinding wheel grinding. After repeated grinding, observed under the microscope, requiring cutting edge straight, no jagged edge, no cracks, the front and rear face surface roughness is low.

The cutting fluid can be used to mention the durability and processing quality of the tool. But the cutting fluid can not use water coolant, cutting fluid, can only use cutting oil. Cutting oil is the main component of mineral oil, a small number of animal or vegetable oil or compound oil. In practice, often add oily additives, extreme pressure additives and anti-rust additives. Commonly used cutting oil mainly has extreme pressure cutting or F43 cutting oil.