Diamond tools are divided into natural diamond and synthetic diamond tools. Natural diamonds have the highest hardness and thermal conductivity of natural substances. However, due to the high cost, processing and welding are very difficult, with the exception of a few special applications (such as watch precision parts, light trim and jewelry engraving) Tools are used in industry. With the development of high-tech and ultra-precision machining. Such as micro-mechanical micro-parts, nuclear reactors and other high-tech fields of various mirrors, missile or rocket navigation gyroscope, computer hard drive chip, accelerator electron guns and other ultra-precision parts processing, single crystal diamond can meet the above requirements The In recent years, a variety of chemical mechanisms have been developed to grind diamond tools and to protect the atmosphere from brazing diamond technology. So that the natural diamond tool manufacturing process has become relatively simple. Therefore, in the field of ultra-precision mirror cutting high-tech applications. Natural diamond played an important role. After the 1950s, high-temperature and high-pressure technology was used to synthesize diamond powder. In the 1970s, diamond-based cutting tools were made of polycrystalline diamond (PCD). PCD grains are in a permissible sequence. Not directional, and thus uniform hardness. It has a high hardness and thermal conductivity, low thermal expansion coefficient. High elastic modulus and low coefficient of friction, the blade is very sharp. It can add a variety of non-ferrous metals and wear-resistant high-performance non-metallic materials such as aluminum, copper, magnesium and its alloys, cemented carbide, fiber plasticizers, metal matrix composites, wood composite materials.

    Three main diamond tool materials - PCD, CVD thick film and synthetic single crystal diamond are characterized by: PCD weldability, mechanical grinding and fracture toughness of the highest resistance to wear and edge quality of the center, corrosion resistance The worst. CVD thick film corrosion resistance is the best, mechanical grinding, cutting edge quality and fracture toughness and wear resistance of the center, poor weldability, synthetic single crystal diamond edge quality, wear resistance and corrosion resistance of the best, welding Sexual, mechanical grinding and fracture toughness of the worst.

    Diamond tool is the ideal tool for high speed cutting (2500 ~ 5000m / min) aluminum alloy, but because of the affinity of carbon to iron, especially at high temperatures, diamond can react chemically with iron, so it is not suitable for cutting Iron and its alloy workpieces.