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中文摘要：
微细电火花线切割表面微观三维形貌与传统切削加工表面完全不同，属于各向同性表面，在对其进行三维粗糙度评定时，测量方向对混合参数的影响很大，测量方向选择不当，混合参数的计算精度很低，甚至出现计算结果与被测表面实际观测结果相反的情况。根据微细电火花线切割加工表面凸峰的特点，采用高斯曲率表征其表面凸峰的凹凸性，消除了测量方向对计算结果的影响。经试验验证，高斯曲率对微细电火花线切割加工表面凸峰的表征结果准确，计算精度高。
英文摘要：
Micro--WEDM surface of microscopic three--dimensional morphology with the traditional cutting of the surface is completely different; the surface morphology with a single mechanical cutting surface is entirely different. It belongs to isotropy surface, the measurement directions have great effects on hybrid parameter when it carries on the 3D assessment of surface roughness. The im- proper choice of measurement directions will make the hybrid parameter with a lower calculation pre- cision, or even the calculation opposes the actual observation for measured surface. This paper used Gaussian curvature characterization concave--convex quality of micro--WEDM surface convex peak according to the characteristics of micro--WEDM surface convex peak, and eliminated the interference of measurement directions on calculation results. The experimental results indicate that Gaussian curvature characterization concave--convex quality of micro--WEDM surface convex peak achieves high computational precision, and the results are reliable accurately.
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