Table with different CBN content and its use 5) PCD cutter PCD tools enable high speed machining of non-ferrous and non-metallic wear resistant materials. According to reports, the cutting speed of the Si-Al alloy processed by the PCD can reach 300~400m/min. The PCD tool is processed on aluminum alloy, magnesium alloy, graphite and powder metallurgy billet, compared with the cemented carbide tool. The life expectancy is increased by 60~145 times; the speed of vc can be processed by PCD face milling cutter with high-strength aluminum alloy cutter to reach 3000~4000m/min, and some reach 7000m/min. After the 1990s, the United States Diamond film cutters (turning and milling inserts, twist drills, end mills and taps, etc.) have been developed in succession, and their service life is 10 to 140 times that of cemented carbide tools. Among them, coated carbide tools are the most widely used and widely used types of tools, and their performance is relatively good. The performance of ceramic tools is between coated carbide tools and superhard material tools. Ceramic tools are harder than hard alloys and are less expensive than CBN and diamond tools. In some cases, they can replace superhard material tools for high speed. Hard cutting and dry cutting. CBN tools and diamond tools have high hardness and long life, suitable for high-volume production and occasions with special requirements, such as precision cutting high hardness materials. CBN tool materials have high thermo-hardness, high strength and high thermal shock resistance. They are ideal tool materials for high-speed finishing or semi-finishing hardened steel, chilled cast iron and superalloys, but can not cut hardness below 45HRC. s material. Diamond cutters have high wear resistance and high speed performance, but have poor impact resistance and poor chemical stability of cutting iron metal. They are mainly used for high-speed coarse and fine-cut non-ferrous metals and non-metallic materials. 2. Tool chuck 1) Triangular deformation precision chuck The working principle of a triangular-angled static collet without clamping elements produced by the German company is shown in Figure 1. The inner hole of the chuck is triangular in a free state, and the diameter of the inscribed circle of the three edges is smaller than the diameter of the shank to be clamped. Using a hydraulic urging device, an external force is applied to the collet to deform the collet, and the inner hole becomes a round hole, and the aperture is slightly larger than the diameter of the shank. At this time, the shank is inserted, and then the applied external force is removed, and the inner hole is re-contracted into a triangular shape, and the shank is clamped at three points. The chuck has compact structure, good symmetry, high precision, simple tool loading and unloading, and can be applied to carbide handles and high speed steel shanks with different expansion coefficients. Previous Next
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Fig.1 Working principle diagram of the triangular deformation hydrostatic chuck without clamping elements
