PCD is made of specially treated diamond sintered with a small amount of binder under high temperature and ultra-high pressure. The disorderly arrangement of diamond grains gives PCD a uniform, extremely high hardness and wear resistance. PCD can be used for cutting tools, grinding wheel dressing, geological drilling, gauging probes, wire drawing feelers, sandblasting feelers, etc. However, the high hardness and high wear resistance of PCD also pose great difficulties for its processing.

Scholars at home and abroad have conducted a lot of researches and tests on the processing problems caused by the high hardness and high wear resistance of PCD materials, including EDM, ultrasonic processing, electrochemical processing, laser processing, etc., and have achieved certain results. However, a comprehensive analysis shows that these machining techniques are mostly applicable to the rough machining of PCD materials at present. In order to obtain good quality of PCD cutting edge, the most ideal processing method is still grinding or lapping with diamond grinding wheels.

PCD grinding process is mainly the result of a mixture of mechanical and thermochemical effects. The mechanical effect is through the diamond wheel grinding grain on the PCD material of the continuous impact and the formation of diamond micro-breakage, wear, shedding or deconstruction; Thermochemical effect is the diamond wheel grinding PCD formed by high temperature to oxidation or graphitization of diamond. The mixture of the two results in the removal of PCD material. The grinding process is mainly characterized by the following

  (1) Grinding force is very high

  Diamond is the hardest known mineral material, and a variety of metal, non-metallic material pair friction wear amount is only 1/50 ~ 1/800 of carbide; PCD hardness (HV) for 80 ~ 120KN/mm2, second only to single crystal diamond, much higher than carbide. When using diamond grinding wheel to grind PCD, the starting cutting strength is very high, about 10 times higher than that of cemented carbide (0.4MPa); the specific grinding energy reaches 1.2×104~1.4×105J/mm3; Therefore, the grinding force is much higher than that of cemented carbide.

  (2) Small grinding ratio

  PCDは硬度と耐摩耗性が高いため（相対耐摩耗性は超硬合金の16～199倍）、PCDの研削比は0.005～0.033と、砥石の1/1000～1/100000程度です。超硬合金; 研削効率はわずか0.4～4.8mm3/minです。したがって、刃物の刃先品質と除去量を確保するには、研削時間が非常に長くなり、加工効率が非常に低くなります。また、PCDの硬度、含有量、粒径が異なると、研削時間も大きく異なります。

(3)粒度は大きな影響を与える

切削工具に使用されるPCD素材は粒度により粗粒（20～50μm）、中粒（10μm）、細粒（～5μm）の3種類に分けられ、研削力や研削倍率に数倍から数十倍の差があります。 。粗粒 PCD は研削比が最も高く、研削が最も難しく、エッジのギザギザが最も激しく、研削後の品質は最悪ですが、耐摩耗性は最も優れています。