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立方氮化硼(CBN)车刀具有高硬度、高热稳定性,就决定了它具有“高红硬性”。利用高速切削产生之热量软化难加工材质,从而改善加工性能是立方氮化硼车刀之所以能切削某些难加工材质之关键所在。实验发现:在“干切削”条件下,在CBN 刀具之高温区发生了CBN(?)HBN 的可逆转化。经检测判明可逆转化起始于晶界微晶区。经模拟试验证实:氧和氧化物对实现CBN(?)HBN 的可逆转化起到了催化剂作用。否定了关于金属钴在CBN 可逆转化过程可以起触媒作用的说法。与此相反,金属钴能通过减少氧化气氛而有助于减少CBN(?)HBN 的倾向。得出的有关结论为提高CBN 刀具使用寿命和深入探讨超硬刀具磨损机理提供了某些线索和依据。
Cubic boron nitride (CBN) turning tool with high hardness, high thermal stability, it decided it has a “high red hardness.” Utilizing the heat generated by high-speed cutting to soften difficult-to-machine materials to improve processability is key to cutting some difficult-to-machine materials for Cubic Boron Nitride turning tools. The experiment found that under the condition of “dry cutting”, CBN (?) HBN reversible transformation occurred in the high temperature region of CBN tool. After the test found that reversible transformation started in the grain boundary microcrystalline area. The simulation results show that oxygen and oxides play a catalytic role in the reversible conversion of CBN (?) HBN. Denied that the metal cobalt in the CBN reversible conversion process can play a catalytic role. In contrast, cobalt metal can help reduce the tendency of CBN (?) HBN by reducing the oxidizing atmosphere. The conclusions drawn provide some clues and evidences for improving the service life of CBN tools and deeply discussing the wear mechanism of superhard tools.