通过SiC晶须、颗粒增强的铝复合材料的车削试验 ,对快速落刀装置上获取的切屑根部标本试样扫描电镜 (SEM )照片的观察和分析后 ,证明了切削这两类复合材料时也产生积屑瘤 ,但与碳钢的鼻形积屑瘤有很多不同 ,其外形呈楔形、积屑瘤高度小且向下方生长也很小或不生长 ,生成机理为机械镶嵌而非“冷焊”。并分析了各工艺参数对积屑瘤高度的影响关系 ,及该楔形积屑瘤对工件表面粗糙度值Ra 和切削形态的影响 Through the cutting experiments of SiC whiskers and particle reinforced aluminum composites, the scanning electron microscope (SEM) photographs of the samples of the root of the chip obtained from the quick dropping device were observed and analyzed, and it was proved that when the two types of composite materials were cut BUE generated, but with carbon steel nose BUE has many different, its shape was wedge, BUE is small and grow to the bottom is also small or no growth, the formation mechanism of mechanical mosaic instead of “cold welding ”. The influence of each process parameter on the height of BUE was analyzed and the influence of the wedge BUE on the surface roughness Ra and the cutting morphology