【摘要】 针对微细电火花线切割加工(MWEDM)表面各向同性的三维微观形貌结构特征,引入圆形度和二阶中心矩的表征算法,更准确地描述MWEDM表面纹理的复杂程度,简化了计算过程;用高斯曲率取代平均曲率表征表面的凹凸特征,使计算不受测量方向的限制,提高了计算准确性和精度;用分水岭算法分割表面几何要素,实现表面凸峰的准确计数,精简了表征参数。经过改进之后的三维粗糙度的结构性参数,对于评定各向同性的MWEDM表面,参数更加简化,表征更加准确。更多还原

【Abstract】 The 3D microtopography of Micro Wire Electrical Discharge Machining( MWEM) surface is characterized by isotropy. The methods of roundness and second order of principal section are introduced to describe the complexity degree of MWEDM surface texture more precisely and simplify the calculation `process.The Gaussian curvature is adopted instead of zenith curvature to characterize the concave convex character of the surface,which can make the calculation not being limited by the measuring direction and improve the calculation precision. The surface geometry elements are cut apart by watershed method to simplify the characterization parameters and realize accurate counting of the surface peaks. It shows that,for estimating the isotropy MWEDM surface,the improved structural parameters of 3D roughness are more simplified and the characterizations are more precise.更多还原