Metal oxide reinforced composite, as a new kind of engineering material, was an essential research topic to industry. Magnesium oxide as particle-reinforced phase, were mixed with wood fiber-matrix to enhance the mechanical properties of composite. However, the research on the surface quality of this composite is still desirable for expanding its application. In order to investigate the surface integrity of this kind particle-reinforced wood-based composite, spiral up-milling experiments were performed with different cutting depth and cutting speed. The effect of cutting speed and cutting depth on surface integrity was investigated. According to the calculation results of black pixels proportion of binary image of machined surface, surface defects were greatly affected by cutting depth rather than cutting speed. Defects, such as pile-up and debonding of particles, were usually observed under 0.5 mm cutting depth, meanwhile, extensive damage of flacking and fracture of wood fiber-matrix were usually observed under 1.5 mm cutting depth. In all, the machined surface formation mechanism of this composite can be different by changing cutting depth.

金属氧化物增强复合材料作为一种新型工程材料，一直是工业界研究的热点。氧化镁作为颗粒增强相，与木纤维基体混合以增强复合材料的力学性能。然而，对这种复合材料的表面质量的研究对于扩大其应用仍然是可取的。为了研究这种颗粒增强木基复合材料的表面完整性，进行了不同切削深度和切削速度的螺旋逆铣实验。研究了切削速度和切削深度对表面完整性的影响。根据加工表面二值图像黑色像素比例的计算结果，表面缺陷受切削深度影响较大，而非切削速度。缺陷，通常在0.5 mm的切割深度下观察到颗粒的堆积和脱粘等，同时，在1.5 mm的切割深度下通常观察到木纤维基体的广泛剥落和断裂损伤。总之，这种复合材料的加工表面形成机制可以通过改变切削深度而不同。