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Grinding characteristics of PCD material


2021-08-13


(1) Great grinding force

Diamond is known to be the highest hardness of minerals, with a variety of metal, non-metallic materials matching friction wear amount is only 1/50 ~ 1/800 hard alloy. The hardness (HV) of PCD is 80 ~ 120KN/mm2, which is second only to single-crystal diamond and much higher than carbide. When using the diamond wheel to grind PCD, the initial cutting strength is more than 10 times that of hard alloy (0.4mpa). The specific grinding energy is 1.2×104 ~ 1.4 ×105J/mm3. Therefore, the grinding force is much higher than that of grinding cemented carbide.

(2) The grinding ratio is very small

Due to the high hardness and wear resistance of PCD (the relative wear resistance of cemented carbide is 16 ~ 199 times), the grinding ratio of PCD is only 0.005 ~ 0.033, about 1/1000 ~ 1/100000 of cemented carbide. The grinding efficiency is only 0.4 ~ 4.8mm3/min. Therefore, in order to ensure the cutting tool edge quality and removal amount, 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 different.

(3) Particle size has a great impact

PCD material used for cutting tools can be divided into three types according to the particle size: coarse particle size (20 ~ 50μm), medium particle size (about 10μm) and fine particle size (-5μm), the grinding force, grinding ratio difference several times to dozens of times. The coarser PCD grinding ratio is the highest, the grinding is the most difficult, and the serrated edge is the most serious, the quality is the worst, but the wear resistance is the strongest. The fine-grained PCD grinding ratio is the lowest, the grinding is easy and the edge quality is the best after grinding.

Based on the grinding characteristics of PCD, when we use PCD for tool grinding, in order to ensure the grinding efficiency, diamond grinding wheels require PCD grinding equipment to be much higher than general tool grinders. Demina PCD tool grinder can meet the grinding characteristics of PCD materials, making grinding easy.

 

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