Characterization of 3D Surface Roughness in Micro-Milling

Due to the large reduction in workpiece size and tool size, the quality of the micro-milling surface has a greater impact on the product than that obtained by conventional milling. Since the typical two-dimensional surface roughness parameters can only partially reflect the state of the surface, a three-dimensional surface roughness evaluation system is proposed to characterize the micro-morphology of the micro-milling surface in this paper. The micro-milled surface was simulated by a non-Gaussian surface. We used the two-dimensional empirical mode decomposition algorithm to extract the reference plane of the simulated surface, selected the three-dimensional roughness parameters suitable for the micro-milling surface and established the evaluation system. This paper compared the three-dimensional surface roughness of the simulated surface and the actual machined surface. The results show that the Bidimensional Empirical Mode Decomposition algorithm is suitable for extracting the reference plane of micro-milling three-dimensional surface roughness, and the three-dimensional surface roughness evaluation system can reflect the characteristics of the micro-milled surface more comprehensively.