基于地貌学的零件表面三维形貌评定

3-D Micro-geometry of Machine Part Surface Based on Geomorphology

Motif方法作为轮廓法的一种,用7个参数可以完成2维粗糙度和波纹度的评定。近年来,国际上加大了对零件三维形貌评定方法的研究,基于地貌学的理论和Motif方法,对零件三维表面结构要素进行了定义,采用变化树和图形分割等方法,用特殊的点和线表述零件表面山峰和谷地的特性,用谷地的概念描述3维Motif。为了避免过分割现象,需要将无意义的谷地合并为有意义的较大的谷地。峰顶密度、封闭的谷周面积、封闭的谷体体积等评定参数可用于零件三维表面形貌的评定。

The concept of the motif combination is applied to characterize surface texture. The seven parameters of the motif-method are simple and very well suited for the evaluation of 2-D roughness and waviness. For 3-D microgeometry of a machine part, a useful way to show the relations between critical points in hills and dales and still retain relevant information, is that of change tree and segmentation based on geomorphology and areal motif. Like the profile motif, several types of surface specific points and lines characterize hills and dales. The dale is the areal equivalent of the profile motif. It is necessary for the surface texture to merge the insignificant dales into larger significant dales in order to avoid over-segmenting the surface. The feature parameters including density of summits, closed void area, closed void volume etc, can be used for assessing the 3-D surface texture of machine part.