PCD is a high-temperature (about 1800 ℃), high pressure (5 ~ 6MPa), the use of cobalt and other metal bonding agent will be many diamond monocrystalline powder polycrystalline material, its hardness is slightly lower than the single crystal diamond, but it is Randomly oriented diamond grain polymerization, is isotropic, used as cutting tools can be arbitrary orientation grinding, without the need for natural diamond as the best cleavable surface as a rake face. In the cutting, the cutting edge is very sensitive to accidental damage, anti-wear ability is also strong, can be a long time to maintain a sharp cutting edge, processing can be used when the high cutting speed and large back knife knife (eat) , The service life is generally higher than the WC-based carbide cutting tools 10 to 500 times, and because the PCD metal bonding agent with conductivity, making PCD easy to cut shape, and rich source of raw materials, the price is only a few tenths of natural diamond To a fraction of the time, has become a traditional WC-based carbide cutting tool high-performance alternatives.

    In order to improve the toughness and weldability of the PCD blade, a diamond composite blade (PCD / CC) was formed by sintering or pressing a 0.5 to 1 mm thick PCD on the surface of the cemented carbide. PCD / CC can be made by welding or machine clip tool. Because of its good solderability, easy to re-grinding, low cost, so widely used. It should be noted that PCD and PCD / CC tool edge sharpness and processing surface quality are not as single crystal diamond, while its poor machinability, grinding ratio is small, it is difficult according to the geometric shape of the arbitrary shape, still can not Conveniently fabricated with chip breaker and indexable inserts and end mills and other geometric shapes of complex products.