[China Aluminum Industry Net] With the increasing number of precision machinery and difficult-to-machine materials, the application of superhard tools has become widespread. Superhard tools have high cutting characteristics, long service life and good workpiece quality. The laser machining process was started earlier, but with the continuous research of scientific researchers in recent years, the production process of man-made superhard tools has been improved, the purity of raw materials and the grain size have been controlled, and the use of conforming materials and hot pressing processes, etc. The gradual application of superhard tools to the semi-finishing and roughing processes is internationally recognized as one of the more promising tool materials for improving productivity.
Superhard tools are divided into diamond tools and cubic boron nitride tools. Because natural diamonds are more expensive, most of the diamond tools used in machining are artificial polycrystalline diamond (PCD), polycrystalline cubic boron nitride (PCBN), and their Composite material.
Earlier in the 1950s, the United States used artificial diamond powder and artificial CBN powders to sinter into larger-sized polycrystalline blocks as tool materials under the action of high temperature, high pressure, catalyst, and binders. The research and application of ultra-hard tools in China began in the 1970s. In 1970, the company established the sixth wheel factory in Guiyang, which is a professional manufacturer of superhard materials and products for the front seats. By 1997, the annual output of synthetic diamonds in China had reached about 500 million carats, and the annual production capacity of CBN reached 8 million carats, ranking the first in the world in the production of superhard material.
Diamond has high hardness and wear resistance. It is a hard material in tool materials, and it has no affinity with non-ferrous metals. Chips have flowed out, and the thermal conductivity is high. It is not easy to generate built-up edge when cutting, and the machining surface quality is good. Can effectively process non-ferrous metal materials and non-metallic materials, such as copper, aluminum and other non-ferrous metals and their alloys, ceramics, plastics, rubber and so on.
It must have been asked that the performance of diamond and cubic boron nitride is almost equivalent, will it cause conflicts? The answer is no, because although diamond has high hardness and good wear resistance, it has poor toughness and poor thermal stability. When the temperature reaches 700°C-800°C, it is easily carbonized and is not suitable for processing steel materials (black metal materials). Cubic boron nitride, on the other hand, has the same hardness as diamond, but it has good thermal stability and can be normally processed at high temperatures (1250°C-1350°C). It is chemically inert to iron group elements and has strong anti-bonding ability. It is suitable for processing all kinds of high hardness steel materials, such as hardened steel gears, bearings, cast iron rolls, pumps and other difficult-to-machine materials.
The use of super-hard tools to process steel and non-ferrous materials, etc., has a cutting rate one order of magnitude higher than that of cemented carbide tools, and tool life is several dozen times that of carbide tools. At the same time, superhard tools can be used for grinding or grinding, grinding, grinding, roughing, finishing a universal knife, a process can be completed, shorten the process, improve production efficiency.
Such as Valin superhard as a professional research and development of ultra-hard cubic boron nitride tool manufacturers, has its own research staff and technical team, through continuous research and practice, to provide high-quality high-quality cutting tool products for the ferrous metal field. Currently used in the market as a whole polycrystalline cutting tool materials are BN-K1 grade (high hardness cast iron field), BN-S20 grade (high hardness cast steel and high hardness heat-treated steel field), BN-S30 grade (grey cast iron field). The three grades have different raw material purity and grain size, and the processing area is also different. However, they have a very high reputation in their respective fields. It not only can process workpieces efficiently, but also has a long tool life. It is an ideal tool for high-hardness and difficult-to-machine materials and requires high-speed cutting. It is an effective assistant in the machinery manufacturing industry.
As an advanced tool, the superhard tool has a good application prospect in the market. Diamond cutters and cubic boron nitride cutters complement each other to a certain extent, effectively solving difficult-to-machine materials. With the continuous development of modern technology and the increase in new and difficult-to-machine materials, it is bound to promote the further development of super-hard tools.
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