关键词: 轮廓度, 公差分析, 积分, 建模, 尺寸链

Abstract: To realize the expression and analysis for profile tolerance of complicated surfaces,the modeling and analysis method was proposed based on integral mapping.The variable factor,the ideal factor and the tolerance zone boundary of free-form surface's profile tolerance were mapped as plane factor by using double integral respectively.According to the spatial relationship of mapped plane factors,the representation model of equivalent dimensional profile tolerance was derived.The normal vector and tangent plane at the point of surface and dimension chain's intersection were employed to construct coordinate system.The dimension chain with the consideration of profile tolerance was built by mapping the equivalent dimensional tolerance to the traditional assembly dimension chain,and the process of the tolerance analysis was performed.The boarding gate of some aircraft was analyzed,and the result showed that the error was increased dramatically with the consideration of profile tolerance.

Key words: profile, tolerance analysis, integral, modeling, dimension chain