Diamond tool performance characteristics:            ① high hardness and wear resistance: natural diamond is the hardest substance found in nature already. Diamond has a very high abrasion resistance, high hardness material machining, diamond tool life of carbide cutting tools lO ~ 100-fold, or even up to a few hundred times.       ② has a very low coefficient of friction: friction coefficient between the diamond and the number of non-ferrous metals are lower than other tools, low coefficient of friction when machining small deformation, can reduce cutting forces.       ③ cutting edge is very sharp: diamond tool cutting edge is very sharp and can be worn, natural single crystal diamond tool up to 0.002 ~ 0.008μm, can be cut slim and ultra-precision machining. ④ has high thermal conductivity: Diamond's high thermal conductivity and thermal diffusivity, cutting heat easily shed, tool cutting part of the low temperature.       ⑤ having a low thermal expansion coefficient: Thermal expansion coefficient of diamond is several times smaller than the carbide, the thermal change caused by the cutting tool size is small, which requires high dimensional precision and accuracy is particularly important for ultra-precision machining. Diamond tool applications.      Diamond tools used for non-ferrous metals at high speed and non-metallic materials for fine cutting and boring. Suitable for processing a variety of wear-resistant non-metallic, such as glass, steel metallurgy blanks, ceramic materials, etc.; variety of wear metals, such as various silicon aluminum alloy; various non-ferrous metal finishing.      Inadequacies of the diamond tool is poor thermal stability, the cutting temperature exceeds 700 ℃ ~ 800 ℃, it will completely lose its hardness; Moreover, it is not suitable for cutting ferrous metal, because diamond (carbon) at high temperatures and easy to iron atom effect, so that the carbon atoms into the graphite structure, tool easily damaged.