ABSTRACT

This work explores an effect of nitrogen ion implantation on the life time of WC-Co tools used in particleboard milling. Nitrogen ions with different energy of 5, 50, and 500 keV and fluence of 1e17 and 5e17 cm⁻² were implanted into the surface of commercially available WC-Co composite indexable knives, using the implanters with mass-separated ion beams. Both untreated and modified samples were subjected to microstructural and durability tests. Microstructural tests involved surface observation, determination of the nature of wear and cracks, determination of element depth profiles, and phase changes occurring in the modified area. Durability tests were conducted with the use of a computerized numerical control (CNC) machining center. The tests included determination of wear curves and calculation of quantities such as cutting length, relative tool life index, standard deviation, standard error, coefficient of variation and quality index and wear increases. Additionally, a histogram of the relative durability distribution of samples implanted with N⁺ was determined. In this study, an attempt was made to relate the durability results with the microstructure of the knives. Tools modified with a nitrogen ion beam of 50 keV showed the best durability results.

摘要

这项工作探讨了氮离子注入对用于刨花板铣削的 WC-Co 刀具寿命的影响。具有5、50和500 keV的不同能量和1e17和5e17 cm ^{-2的注量的氮离子}使用具有质量分离离子束的植入器将其植入市售 WC-Co 复合可转位刀的表面。未经处理的和改性的样品都进行了微观结构和耐久性测试。微观结构测试包括表面观察、磨损和裂纹性质的确定、元素深度剖面的确定以及改性区域发生的相变。耐久性测试是使用计算机数控 (CNC) 加工中心进行的。测试包括磨损曲线的确定和切削长度、相对刀具寿命指数、标准偏差、标准误差、变异系数和质量指数以及磨损增加等量的计算。此外，植入 N 的样品的相对耐久性分布的直方图⁺确定。在这项研究中，试图将耐用性结果与刀具的微观结构联系起来。用 50 keV 的氮离子束修改的工具显示出最好的耐久性结果。