Thin-walled workpieces of silicon carbide particle-reinforced aluminum matrix (SiC_p/Al) composites with outstanding properties have been widely applied in many fields, such as automobile, weapons, and aerospace. However, the thin-walled workpieces exhibit poor rigidity, large yield ratio, and easily deform under the cutting force and cutting heat during the machining process. Herein, in order to improve the processing efficiency and precision of higher volume fraction SiC_p/Al composite thin-walled workpieces, the influence of different high-speed milling parameters and machining paths on the edge defects is analyzed. The results reveal that the cutting force initially increased and then decreased with the cutting speed. Besides, the cutting force steadily increased with radial cutting depth and feed per tooth, but the influence of feed per tooth is less than radial cutting depth. After up-milling cut-in and cut-out processing and down-milling cut-out processing, the cut-in end of the workpiece exhibited higher breakage and obvious edge defects. However, the workpiece edges remained intact after down-milling cut-in processing. In conclusion, a higher cutting speed, a smaller radial cutting depth, and moderate feed per tooth are required to decrease the cutting force during the milling of SiC_p/Al composite thin-walled workpiece. Furthermore, down-milling cut-in processing mode can reduce the edge defects and improve the processing efficiency and precision of the workpiece.

碳化硅颗粒增强的铝基体的薄壁工件碳化硅（SiC _p / Al）的具有优异性能的复合材料已在许多领域，如汽车，武器和航天得到广泛应用。但是，薄壁工件的刚性差，屈服比大，并且在加工过程中在切削力和切削热的作用下容易变形。在此，为了提高更高的体积分数SiC _p的加工效率和精度/ Al复合薄壁工件，分析了不同的高速铣削参数和加工路径对边缘缺陷的影响。结果表明，切削力随着切削速度的增加先增大后减小。此外，切削力随着径向切削深度和每齿进给量的增加而稳定增加，但每齿进给的影响小于径向切削深度。经过向上铣削切入和切出处理以及向下铣削切入处理后，工件的切入端显示出更高的破损和明显的边缘缺陷。但是，在进行向下铣削切入处理后，工件边缘仍保持完整。总之，需要更高的切削速度，更小的径向切削深度和适中的每齿进给量，以降低SiC铣削过程中的切削力_p / Al复合薄壁工件。此外，向下铣削切入加工模式可以减少边缘缺陷，提高工件的加工效率和精度。