Now many manufacturers are using diamond tools, but they don't know much about diamond tools. Let's discuss the situation of diamond tools together.
Polycrystalline diamond (PCD) cutter: PCD is a polycrystalline material synthesized by sintering diamond fine powder through cobalt and other metal binders under high temperature and high pressure conditions, also known as sintered diamond. The polycrystalline diamond tool is integrally sintered into a milling cutter, which is used for milling processing. The PCD grains are disorderly arranged, isotropic, uniform in hardness, and graphitized at 550°C. 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.
PDC cutter: To improve the toughness and weldability of PCD inserts, PCD and cemented carbide blades are often made into PDC inserts. That is, a layer of PCD with a thickness of 0.5 to 1 mm is pressed on the surface of the cemented carbide substrate and sintered. The bending strength of the composite blade is basically the same as that of the cemented carbide, and the hardness is close to the PCD, so it can be used instead of the PCD.
Natural diamond (ND) cutting tools: Natural diamond is the hardest substance among the known minerals, and is mainly used to prepare cutting tools. After fine grinding with natural diamond tools, the radius of the cutting edge can reach 0.01～0.002μm. Among them, the cutting edge of natural single crystal diamond (SCD) tool was still magnified by 1500 times magnification, but the cutting edge was still smooth. When SCD turns aluminum pistons, Ra can reach 4μm, while under the same cutting conditions, the surface roughness when processed with a PCD tool is 15-50μm. Using SCD tool with precision lathe for precision and ultra-precision machining, you can get a mirror surface.
CVD diamond thick film (TDF) welding tool: the diamond thick film welding tool is to weld the laser-cut CVD diamond thick film to the substrate (usually K-type cemented carbide) to form a composite sheet, and then polish the composite sheet, twice Welded to the blade body, sharpened to the required shape and edge. As shown in Fig. 3(a), it is a CVD diamond thick film (diamond film thickness up to 30μm), which has the characteristics of high hardness, wear resistance, and small friction coefficient. It is an ideal material for manufacturing cutting tools for non-ferrous and non-metallic materials.
Diamond-coated tools: Diamond-coated tools use CVD to deposit a layer of 1-25μm diamond film directly on cemented carbide (K-based cemented carbide) or ceramic substrates, without cleavage plane isotropy. The hardness of thin-film coated tools reaches 9800～10000HV. The thermal conductivity is high, and the thermal conductivity at room temperature is up to 2000W/m·K, while the thermal conductivity of cemented carbide tools is only 80～100W/m·K. CVD diamond can be coated on tools of any complex shape, which is the most significant advantage that polycrystalline diamond cannot possess.
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