Grinding characteristics of PCD materials

2022-08-01

Diamond is the substance with the highest hardness among the known minerals, and the wear amount of friction with various metals and non-metallic materials is only 1/50~1/800 of that of cemented carbide; the hardness (HV) of PCD is 80~120KN/mm2 , second only to single crystal diamond, much higher than cemented carbide. When grinding PCD with diamond grinding wheel, the initial cutting strength is very high, which is about 10 times that of cemented carbide (0.4MPa); the specific grinding capacity is 1.2×104～1.4×105J/mm3; Therefore, the grinding force is much higher than grinding carbide.
(2) The grinding ratio is very small

Due to the high hardness and wear resistance of PCD (the relative wear resistance is 16 to 199 times that of cemented carbide), the grinding ratio of PCD is only 0.005 to 0.033, which is about 1/1000 to 1/100000 to that of cemented carbide.; grinding efficiency is only 0.4～4.8mm3/min. Therefore, in order to ensure the cutting edge quality and removal amount of the cutting tool, the grinding time is very long and the processing efficiency is very low. In addition, when the hardness, content and particle size of PCD are different, the grinding time is also very different.

(3) The particle size has a great influence

PCD materials used in cutting tools are mainly divided into three categories according to particle size: coarse particle size (20-50μm), medium particle size (about 10μm) and fine particle size (~5μm), and the grinding force and grinding ratio are different from several times to dozens of times. Coarse-grained PCD has the highest grinding ratio and is the most difficult to grind. After grinding, the cutting edge has the most serrated shape and the worst quality, but the wear resistance is the strongest; The cutting edge quality is the best after grinding.

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