Cubic boron nitride (CBN) composites frequently serve as tool materials in abrasive machining for surface finishing. The geometric features of individual CBN grains are crucial for both machining stability and the resulting surface quality of workpieces. While the grains, whether embedded in the matrix or exposed on the working surfaces, showcase seemingly ‘random’ geometric characteristics, they can typically be described through statistical analysis. In this study, three crucial three-dimensional geometric features of the CBN abrasive grains exposed on the working surface of a commercial CBN honing stone were characterized. These features include the protrusion height, inclination angle, and projection angle. In total, 116 abrasive grains identified within the processing zone were individually measured and inspected using a digital microscope and scanning electron microscope. The obtained results underwent statistical analysis and were subsequently compared. The results revealed that the abrasive grains exhibited an average protrusion height of 18.56 μm, an average inclination angle of 35.32°, and an average projection angle of 120.70°. Utilizing the measurement and inspection results, the abrasive grains were categorized into five distinct groups, each corresponding to a different phase in their service life cycle.

中文翻译：

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研究在用珩磨石上 CBN 颗粒的关键几何参数和使用寿命周期


立方氮化硼 (CBN) 复合材料经常用作表面精加工磨料加工中的工具材料。单个 CBN 晶粒的几何特征对于加工稳定性和工件的表面质量至关重要。虽然颗粒，无论是嵌入基体中还是暴露在工作表面上，都表现出看似“随机”的几何特征，但它们通常可以通过统计分析来描述。在本研究中，对暴露在商用 CBN 珩磨油石工作表面上的 CBN 磨粒的三个关键三维几何特征进行了表征。这些特征包括突出高度、倾斜角度和投影角度。使用数码显微镜和扫描电子显微镜对加工区内总共 116 颗磨粒进行了单独测量和检查。对所得结果进行统计分析并随后进行比较。结果表明，磨粒的平均突出高度为18.56μm，平均倾斜角为35.32°，平均投影角为120.70°。利用测量和检查结果，磨料颗粒被分为五个不同的组，每个组对应于其使用寿命周期的不同阶段。