零件真实粗糙表面构建及微观接触性能分析

The Analysis of Micro Contact Performance Based on Established Real Rough Surface of Parts

目前对于微观粗糙表面模型的构建主要采用统计数学方法和分形方法,建模的前提基于大量假设和简化,不能真实反映表面形貌特征。因此提出了采用三维数字化测量与逆向工程相结合建立零件真实粗糙表面的方法,并分析微观接触性能。利用三维形貌测量仪测量得到真实粗糙表面形貌数据,并经过数据精简、去噪处理,采用逆向建模方法得到真实粗糙表面的三维实体模型;应用有限元分析技术,分析粗糙表面接触性能,包括结合面接触应力随载荷变化规律、不同加工方式零件界面真实接触面积变化规律,以及结合面受力-变形关系等。该方法有利于揭示零件微观界面接触机理,为进一步研究宏微观接触性能提供了方法参考。

At present,the study of micro rough surface model mainly adopts mathematical statistics method and fractal method. However these modeling methods are based on a large number of assumption and simplification,which cannot reflect the surface topography characteristic factually. Thus, a method of parts real rough surface based on the 3 D digital measurement and reverse engineering is proposed to analyze the micro contact performance. The real rough surface topography data is obtained by 3 D profile measurement instrument,and the 3 D entity model of real rough surface is established by reverse modeling after data compaction and denoising. The contact performance of rough surface,including the change of jointing surface contact stress to load,the real contact area of parts interface to different processing method,the relationship of jointing surface force to deformation,etc.,is analyzed with finite element analysis technology. This method helps to uncover contact mechanism of parts micro interface,and provides reference method for further study of macro and micro contact performance.