Abstract: To investigate the floating grinding performance of 2.5D Cf/SiC brake materials, the influences of grinding wheel speed, table setting pressure and grinding depth on grinding force, surface roughness and surface profile were investigated in a single-factor test, and the typical machining defects on grinding surfaces and material removal mechanism were analyzed. The results show that the grinding wheel speed, table setting pressure and grinding depth produce significant influences on the normal grinding forces, but little effect on tangential grinding forces. The table setting pressure produces the greatest influences on the surface roughness. 2.5D Cf/SiC is mainly removed by brittle fracture, and there are differences in the forms of processing defects in different fiber directions, and the main processing defects are interfacial debonding, microcracking, matrix fragmentation, fiber peeling and fragmentation. The experiments were analyzed by a single factor method to obtain good surface quality, with a surface roughness Sa of 0.6 μm.

Key words: 2.5D Cf/SiC brake material, floating grinding, grinding force, surface roughness, surface topography, material removal mechanism

摘要： 为研究2.5D Cf/SiC刹车材料的浮动磨削加工性能，设计单因素试验探究了砂轮转速、工作台调定压力和磨削深度对磨削力、表面粗糙度和表面形貌的影响规律，分析了磨削表面典型加工缺陷及材料去除机理。结果表明：砂轮转速、工作台调定压力和磨削深度对法向磨削力影响显著，对切向磨削力影响不大；工作台调定压力对表面粗糙度的影响程度最大。2.5D Cf/SiC刹车材料以脆性断裂去除方式为主，不同纤维方向上的加工缺陷形式存在差异，其主要加工缺陷为界面脱粘、微裂纹、基体破碎、纤维剥离及破碎。试验通过单因素方法分析得到了较好的表面质量，表面粗糙度Sa可达0.6 μm左右。

关键词: 2.5D Cf/SiC刹车材料, 浮动磨削, 磨削力, 表面粗糙度, 表面形貌, 材料去除机理