Hard material tool is not only an ideal tool machining high hardness of the material, but also for high-speed precision and automated processing, especially with the hard material tool carried to the car instead of grinding, to milling and grinding, more efficient, and low consumption. Adaptability, shorten the manufacturing cycle, etc., now require high precision, large quantities of auto parts has been widely used. While such tools expensive than carbide class, but as long as the object and conditions chosen to be appropriately allocated to each piece of tooling costs but lower than carbide cutting tools. Such as FAW fine boring tool with PCD silicon aluminum alloy piston pin hole (V = 160m / min, f = 0.08-0.10mm / r, a = 0.05mm.), Tool life up to 42,500, it is the original hard alloy tool 90 times, from the original surface roughness value *, the class can reduce alignment tools and other auxiliary time 30min, apportioned to the cost of each piece of the tool than Carbide Tool decreased by about 85%. PCBN cutting tool wear is higher than at the end of the coating of carbide cutting tools 50 times higher than the coating of carbide cutting tools knife times, 25 times higher than the ceramic knives, but only close to half of the diamond tool.