单纤维增强SiC_(f)/SiC陶瓷基复合材料切削机理研究  

Study on Cutting Mechanism of Single Fiber Reinforced SiC_(f)/SiC Ceramic Matrix Composite

作　　者：孙永春 SUN Yong-chun(AVIC Beijing Precision Engineering Institute for Aircraft Industry,Beijing 100076)

机构地区：[1]航空工业北京航空精密机械研究所,北京100076

出　　处：《航空精密制造技术》2023年第4期6-8,12,共4页Aviation Precision Manufacturing Technology

基　　金：航空科学基金资助项目(201903043001)。

摘　　要：根据SiC_(f)/SiC陶瓷基复合材料的结构特点构建了二维切削有限元分析模型,发现微裂纹在基体材料的萌生与扩展、增强相纤维对裂纹扩展的阻碍是切削该材料的基本去除方式。单纤维增强SiC_(f)/SiC陶瓷基复合材料切削过程是基体材料的裂纹不断萌生、扩展和增强纤维不断拉断、折断而形成切屑的综合过程,刀具与基体、纤维不断的脱离、接触导致切削力波动大,切削过程呈明显的随机波动特性。SiC纤维的存在对于控制裂纹的形成与扩展具有重要作用,SiC纤维限制了裂纹的扩展长度,使得形成的切屑尺寸较小,有利于提高表面加工质量。According to the structural characteristics of SiC_(f)/SiC Ceramic matrix composite,a two-dimensional cutting finite element analysis model was constructed.It was found that the initiation and growth of microcracks in the matrix material,and the resistance of reinforcement fibers to crack growth were the basic removal methods for cutting the material.The cutting process of single fiber reinforced SiC_(f)/SiC Ceramic matrix composite is a comprehensive process of the crack initiation and propagation of the matrix material and the chip formation due to the continuous breaking and fracture of the reinforcement fiber.The continuous separation and contact between the tool and the matrix and fiber lead to large fluctuations in the cutting force,and the cutting process shows obvious random fluctuations.The presence of SiC fibers plays an important role in controlling the formation and propagation of cracks.SiC fibers limit the length of crack propagation,resulting in smaller chip sizes and improving surface processing quality.

关 键 词：SiC_(f)/SiC陶瓷基复合材料 切削去除机理 SIC纤维 切削过程仿真 

分 类 号：TG506[金属学及工艺—金属切削加工及机床]