关键词: Cf/SiC陶瓷基复合材料, 各向异性, 微孔加工, 以磨代铣, 金刚石铣磨头

Abstract: Cf/SiC ceramic matrix composites were typical high hardness and brittleness ones difficult to machine that combined anisotropy and heterogeneous structures. It was difficult to machine micro holes with a pore size of less than 5 mm, and always was a hot research topic in the industry. Three types of small diameter diamond milling heads was used for hole machining experiments, the preparation method of milling heads and the influences of end geometry on drilling forces, service life, micro hole defects, and tool surface quality were studied. The results show that the micro hole defects produced by the core brazing milling head are the least and the service life is 3.6 times that of the flat bottomed electroplating milling head and 2 times that of the flat bottomed brazing milling head,the core taking brazing milling head has an end face core taking structure, which may reduce drilling force and significantly improve the service life of the tool and the surface quality of the machined workpieces effectively.

Key words: Cf/SiC ceramic matrix composite, anisotropy, micro hole machining, replacing milling with grinding, diamond milling head