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The name cubic boron nitride monolithic tool is still very unfamiliar to everyone, and everyone has the same question, what is the cubic boron nitride monolithic cutter? In which industry is the cubic boron nitride monolithic cutter used? What are the advantages of boron nitride integral cutting tools? Can cubic boron nitride integral cutting tools be trusted all the time? Today I will take you with us to solve these questions.
1. The cubic boron nitride integral tool has high hardness and wear resistance
The microhardness of CBN single crystal is HV8000~9000, which is the second highest hardness material currently known, PCBN The hardness of the composite sheet is generally HV3000～5000. Therefore, it has higher wear resistance than cemented carbide and ceramics when it is used to process high-hardness materials, which can reduce the dimensional deviation or dimensional dispersion in the processing of large parts, especially suitable for equipment with a high degree of automation, which can reduce tool change. Adjust the auxiliary time of the knife to give full play to its effectiveness.
2. The cubic boron nitride integral tool has high thermal stability and high temperature hardness. The heat resistance of CBN can reach 1400-1500 °C, and the hardness at 800 °C is that of Al2O3/TiC ceramics. Normal temperature hardness, therefore, when the cutting temperature is high, the material to be processed will soften, and the hardness difference between the tool and the tool will increase, which is conducive to the cutting process, but has little effect on the tool life.
3. The cubic boron nitride integral tool has high chemical stability.
CBN has high anti-oxidation ability, and does not produce oxidation at 1000 ° C. There is no chemical reaction at ℃, but it will hydrolyze with water at about 1000 ℃, causing a large amount of CBN to be worn away. Therefore, when using PCBN tools for wet cutting, care should be taken to select the type of cutting fluid. In general, wet cutting does not significantly improve the life of PCBN tools, so dry cutting is often used when using PCBN tools.
4. Cubic boron nitride integral tool has good thermal conductivity
The thermal conductivity of CBN material is lower than that of diamond but much higher than that of cemented carbide, and with the increase of cutting temperature
The thermal conductivity of the PCBN tool continues to increase, so the heat at the tool tip can be quickly transmitted, which is beneficial to the improvement of the machining accuracy of the workpiece.
5. The cubic boron nitride integral tool has a low friction coefficient
The friction coefficient between CBN and different materials is between 0.1 and 0.3, which is much lower than that of cemented carbide (0.4 to 0.6) , and decreases slightly with the increase of friction speed and positive pressure. Therefore, the low friction coefficient and excellent anti-adhesion ability make it difficult for the CBN tool to form a stagnant layer or built-up edge during cutting, which is beneficial to the improvement of the machined surface quality.
