1.1 High hardness and wear resistance The hardness of polycrystalline diamond is up to 10,000HV, which is the hardest material in artificial materials in the world. It is much harder than tungsten carbide and engineering ceramics. Also polycrystalline diamond has excellent wear resistance. 1.2 Low friction coefficient The friction coefficient of polycrystalline diamond and some non-ferrous metals is lower than that of other materials, which is about 1/2 of tungsten carbide. Low friction coefficient not only makes deformation and reduces cutting force. Also does not produce chips during cutting, thus reducing the surface roughness. 1.3 High thermal conductivity Polycrystalline diamond has a high thermal conductivity, better than silver and copper, and much higher than tungsten carbide. So, cutting heat dissipates easily and the cutting temperature is reduced effectively when cutting. 1.4 High machining accuracy 1.4.1 Because polycrystalline diamond tools have low thermal expansion co... See full list on 2.1 Grinding In view of high hardness and wear resistance of polycrystalline diamond, the grinding ways mainly are diamond grinding wheelgrinding, electric discharge grind electrochemical grinding. Diamond wheel grinding is the simplest and most effective grinding method. In the actual machining process, apply to different grinding methods tobine machining. 2.1.1 Diamond Wheel Grinding When diamond wheel grinding polycrystalline diamond, the direct contact pressure and grinding pressure between the grinding wheel and workpiece are high, so it requires the grinding system has sufficient rigidity and high precision. In recent years, many countries are researching and developing special grinding machines and grinding wheelsuding polycrystalline cubic boron nitride PCBN). In the early stage of development resin bond diamond grinding wheels are used, but the grinding efficiency is low. In recent years, with the development of the technology of... See full list on PCD tool has very high durability, which is tens of times longer than that of tungsten carbide tools, stable dimensional processing accuracy and good surface roughness of the workpiece. The main processing objects are non-ferrous metals, non-metallic materials, and woodworking materials containingAL2O3, alloys, ceramics, various fiber and particle reinforcedposite materials. Ultra-precision processing can also be done for the above materials. Nowadays, the main are PCD woodworking saw blades and trimming knives, PCD inserts, PCD piston series cutters, PCD hub cutters, etc. 3.1 Automobile industry PCD tools account for 60% of the applications in the automotive field. PCD tools are mainly used to process engine piston, pinhole, cylinder block, gearbox, carburetor and etc.. Because the silicon content of these parts is high (more than 10%) and most of them are produced in batches by pipeline mode and require high service life of the tools. And tungsten carbide tools cannot work. Th... See full list on 4.1 Size is bigger and bigger. 4.2 Grain refinement, quality optimization, and performance homogenization. Early polycrystalline diamond products are applied 50um diamond powder, but now develops 2um or even less than 0.5um, so that polycrystalline diamond tools, dies inaccuracy is no longer inferior to single crystal diamond. 4.3 The wear ratio of PCD is higher and higher. The wear resistance of polycrystalline diamond is an important index to measure its quality level. As a new type of superhard material product, its quality level has been continuously improved, and the wear ratio has be higher and higher after years of research and production. 4.4 Various shape and structure of PCD products. In the past, polycrystalline diamond products were usually slice and cylindrical. With the development of large size and processing technology (such as EDM and laser cutting), triangle, herringbone, gable spherical surface, surfeased. In order to meet the... See full list on
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