1) artificial polycrystalline diamond (PCD) is a polycrystalline material formed by the polymerization of diamond powder and solvent under high temperature and pressure. Its hardness is lower than that of natural diamond (about HV6000).Wear resistance and high life 50-100 times;Cutting speed can be increased 5-20 times;Roughness up to Ra0.05 m, brightness than natural diamond knife
2) natural diamond (diamond) hardness up to hv 9000-10000, is the nature of the hardest material.The cutting tool can keep the dimensional stability for a long time, so it has a long service life.The circular arc part of the cutting edge of the cutter made of natural diamond is observed under 400 times microscope without gap, which is suitable for processing gold, silver, copper, aluminum (aluminum alloy), zinc (zinc alloy), acrylic (plexiglass) and other materials.The surface roughness can be up to Ra(0.01-0.025) m.High cutting efficiency and stable machining accuracy.
Diamond cutter has the advantages of high hardness and wear resistance, low friction coefficient, high elastic modulus, high thermal conductivity, low thermal expansion coefficient, and low affinity with non-ferrous metals.Can be used for non-metallic hard brittle materials such as graphite, high wear resistant materials, composite materials, high silicon aluminum alloy and other ductile non-ferrous metal materials precision processing.There are many types of diamond cutters, and their properties are obviously different.
Diamond cutter has high hardness and wear resistance, low friction coefficient, high elastic modulus, high thermal conductivity, low thermal expansion system Number, and low affinity with non-ferrous metals and other advantages.Can be used for non-metallic hard brittle materials such as graphite, high wear resistant materials, composite materials, high silicon aluminum alloy and other ductile non-ferrous metal materials precision processing.There are many types of diamond cutters, and their properties are obviously different.
Natural diamond cutters are mainly used for processing precious non-ferrous metals such as copper and copper alloy, gold, silver and rhodium, as well as ultra-precision mirror of special parts, such as video disc, optical plane mirror, polyhedral mirror and quadric mirror.But its crystalline anisotropy, the cutter price is expensive.The performance of PCD depends on the content of diamond grains and cobalt, and the tool life is 10 ~ 500 times that of WC (WC matrix) tools.Mainly used for turning all kinds of non-ferrous metals such as aluminum, copper, magnesium and its alloys, hard alloys and abrasion-resistant fiber plasticizing materials, metal matrix composites, wood and other non-metallic materials.Cutting speed feed speed and cutting depth machining conditions depend on the workpiece material and hardness.The performance and application of PDC are similar to that of PCD cutters. It is mainly used for cutting non-ferrous metals, hard alloys, ceramics, non-metallic materials (plastic, hard rubber, carbon rods, wood, cement products, etc.) and composite materials, gradually replacing hard alloy cutters.Because there are some residual bonding metals and graphite between diamond particles, the bonding metals in the form of coalescence or veins will reduce the wear resistance and service life of the tool.In addition, there is a residual amount of solvent metal, which contacts directly with diamond surface.Reduce (PDC) oxidation resistance and tool heat resistance temperature, so tool cutting performance is not stable.The preparation process of thick film diamond cutter is complex because of the high interfacial energy between diamond and low melting point metal and its alloy.It is difficult for diamond to be impregnated by common low melting solder alloys.Due to poor weldability, it is difficult to make complex geometric tools. Therefore, TDF welding tools cannot be used in high-speed milling.Diamond-coated cutters can be used for high-speed machining. The reason is that in addition to the excellent mechanical properties of diamond-coated cutters, diamond-coated cutters can be used to prepare milling cutters with arbitrary complex shapes for high-speed machining such as aluminum titanium alloy aerospace materials and refractory non-metallic materials such as graphite electrodes.
Polycrystalline PCD cutter
PCD is a polycrystalline material, also known as sintered diamond, which is synthesized by agglomerating and sintering diamond micropowders through cobalt and other metal binders under high temperature and ultrahigh pressure.Polycrystalline diamond cutting tools as a whole to burn form milling cutter for milling, PCD grains are arranged disorderly state, isotropic, uniform hardness, graphitization temperature is 550 ℃.The tool has high hardness, high thermal conductivity, low thermal expansion coefficient, high elastic modulus and low friction coefficient.The blade is very sharp and so on.
Man-made PCD cutter
In order to improve the toughness and weldability of PCD blade, PCD and carbide body are often made into synthetic polycrystalline diamond composite blade (PDc).In other words, a layer of 0.5 ~ 1mm thick PCD is pressed on the surface of cemented carbide substrate and sintered.The bending strength of composite blade is basically the same as that of hard alloy, and the hardness is close to PCD, so it can be used instead of PCD.The cutting edge sharpness and surface quality of PCD and PDC tools are lower than ND.At the same time, its machinability is very poor, the grinding ratio is small, it is difficult to arbitrary shape according to the geometry of the tool head.The synthetic polycrystalline diamond (PDC) composite can only be used to produce turning tools but not indexable blades with chip breaker and milling cutters with complex 3d curved surfaces.
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