Summary of knowledge of high-speed cutting CNC tool materials
Time：2016-07-29 Click：4341
ceramic knife
The materials of ceramic tools are mainly alumina-based and silicon nitride-based. Ceramic tools have high hardness (HRA91~95), high strength (750~1000MPa), good wear resistance and good chemical stability. , Good anti-adhesion performance, low friction coefficient and low price. Not only that, ceramic tools also have high high-temperature hardness, reaching HRA80 at 1200°C. During normal cutting, the durability of ceramic tools is extremely high, and the cutting speed can be increased by 2 to 5 times compared with cemented carbide. In recent years, due to the control of raw material purity and particle size refinement, various carbides, nitrides, borides, and oxides have been added to improve its performance. Particles, whiskers, phase changes, microcracks and several The synergistic effect of toughening mechanism improves its fracture toughness, which not only increases the flexural strength to 0.9~1.0GPa (the high one can reach 1.3-1.5GPa), but also greatly improves the fracture toughness and impact resistance. Expanding day by day, in addition to general finishing and semi-finishing, it can also be used for roughing under impact load. It is recognized internationally as the most potential tool for improving production efficiency. At present, ceramic tools can process materials such as steel, cast iron and their alloys at a high speed of 200~1000m/min, and the tool life is several times or even dozens of times higher than that of cemented carbide. Compared with superhard tools such as diamond and CBN (cubic boron nitride), the price of ceramics is relatively low.
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