高硬刀具干切削淬硬钢时的磨损性能

Wear Property of Cutting Tools with High Hardness in Dry Turning Hardened Steel

采用陶瓷CC6050、立方氮化硼CB7025和硬质合金GC2025刀具干切削淬硬轴承钢GCr15,研究了各刀具切削后的磨损曲线以及刀具的磨损形貌,并分析了刀具的磨损机理。结果表明:CB7025刀具的寿命最长,其次为CC6050刀具,GC2025刀具的最短;CC6050和CB7025刀具的前刀面均呈月牙洼磨损形貌,后刀面均出现了明显的磨损带;刀具的磨损机理主要有扩散磨损、氧化磨损和磨粒磨损,CC6050刀具中含有的铝和硅元素与工件材料化学亲和性较小,不易发生粘结磨损,CB7025刀具存在相变磨损,GC2025刀具存在粘结磨损。

The dry turning of hardened steel was carried out by ceramic tool （CC6050）, CBN tool （CB7025） and carbide tool （（X22025） to study the wear curves and wear morphology of the tools after turning, and the abrasion mechanism of the tools was analyzed. The results show that the CB7025 tool had the longest working life, followed by the CC6050 tool, and the GC2025 tool had the shortest working life. The wear patterns on the rake face of the CC6050 and CB7025 tools were both crater wear; there were clearly wear lands on the flank of these tools. The dominant wear mechanisms of tools included diffusion wear, oxidation wear and abrasive wear, but the adhesive wear was not easy to happen because the chemical affinity between A1, Si elements contained in the CC6050 tool and workpiece material was small; the phase change wear was found in CB7025 tool, the adhesive wear was also found in GC2025 tool.