Nov 23, 2018
Diamond tools have extremely high hardness and wear resistance, low friction coefficient, high modulus of elasticity, high thermal conductivity, low coefficient of thermal expansion, and low affinity with non-ferrous metals. It can be used for precision machining of non-metallic hard and brittle materials such as graphite, high wear resistant materials, composite materials, high silicon aluminum alloys and other ductile non-ferrous materials. There are many types of diamond tools, and the performance difference is significant. The structure, preparation method and application fields of different types of diamond tools are quite different.
Natural diamond tools are mainly used for copper and copper alloys and precious non-ferrous metals such as gold, silver and tantalum, as well as ultra-precision mirror processing of special parts such as video recorder disks, optical flat mirrors, polygon mirrors and quadric mirrors. However, its crystal anisotropy and expensive tools are expensive. The performance of PCD depends on the diamond grain and cobalt content, and the tool life is 10 to 500 times that of cemented carbide (WC matrix) tools. Mainly used for turning various non-ferrous materials such as aluminum, copper, magnesium and their alloys, hard alloys and highly wear-resistant fiber plasticizers, metal matrix composites, wood and other non-metallic materials. Cutting speed, feed rate and depth of cut machining conditions during machining depend on the material of the workpiece and the hardness. The properties and applications of synthetic polycrystalline diamond compact (PDC) are close to PCD tools, mainly used in non-ferrous metals, hard alloys, ceramics, non-metallic materials (plastics, hard rubber, carbon rods, wood, cement products, etc.), composite materials. Such as cutting, gradually replace the carbide tool. Due to the partial residual bonding of the metal between the diamond particles and the graphite, the bonding of the bonding metal in a coalesced or vein-like manner reduces the wear resistance and life of the tool. In addition, there is a residual amount of solvent metal, and the solvent metal is in direct contact with the diamond surface. Reduced (PDC) oxidation resistance and tool heat resistance temperature, so the cutting performance of the tool is not stable enough. The preparation process of diamond thick film cutters is complicated due to the high interfacial energy between diamond and low melting point metals and their alloys. Diamond is difficult to infiltrate by general low melting point solder alloys. TDF welding tools cannot be used in high-speed milling because of poor solderability and difficulty in making complex geometries. Diamond coated tools can be used for high speed machining because, in addition to the excellent mechanical properties of diamond coated tools, the diamond coating process can produce arbitrarily complex shape milling cutters for high speed machining such as aluminum-titanium aerospace materials and difficult machining. Metal materials such as graphite electrodes.