Abstract: To adapt to the extensive application of digital coordination and digital measuring equipment in aircraft assembly,a new digital coordination method based on Tolerance-Map (T-Map) was proposed for aircraft component intersection assembly.The geometric elements of assembly features were mapped to Euclidean point-space,and the mapping relationship was established between tolerance zone and T-Map.Furthermore,all the variational possibilities arising from the geometric element of feature were mapped to T-Map in Euclidean space.The dimension of T-Map was reduced to obtain the 2D and 3D spatial domains of the geometric element.The T-Maps of intersection axes were constructed according to the coordination requirements of component intersection assembly,and the intersection axes' T-Maps were unified with the same basis-simplex.After that,the unified T-Maps were accumulated by Minkowski sum to get the accumulation T-Map.The geometric relationship between accumulation T-Map and intersection axes' T-Maps was used for tolerance accumulation and distribution.A Fork-ear fuselage-wing intersection docking assembly example was carried on tolerance analysis.The example showed that the proposed method took point-space coordinates as the object for error accumulation and tolerance distribution,which could meet the need of digital assembly tolerance control for the mode of point measurement,and provide a new way for component coordination of digital assembly.

Key words: aircraft component, assembly, tolerance, tolerance-map, digital coordination

摘要： 为适应数字化协调和坐标点数字化测量设备在飞机装配中的广泛应用,以飞机部件交点装配为研究对象,提出基于公差图的飞机部件交点装配数字化协调方法。首先,将装配特征几何要素映射为欧氏空间中的点,建立特征公差域与公差图之间的映射关系,将特征几何要素变动映射为欧氏空间中的公差图。再对公差图进行降维,以获得特征几何要素变动的2维和3维空间域。然后,针对部件交点装配的协调要求,构建各交点轴线的公差图,用同一基本单形统一表示各交点轴线的公差图。接着,利用闵可夫斯基和方法对统一后的公差图进行累积,得到协调要素的累积公差图。并依据累积公差图和交点轴线公差图的几何关系进行公差累积与分配。最后,以叉耳式机身—机翼交点对接装配为例进行公差分析。应用实例表明,该方法直接以点空间坐标作为误差累积和公差分配的对象,可满足面向点测量模式的数字化装配容差控制需要,为部件交点装配数字化协调提供了一种新途径。

关键词: 飞机部件, 装配, 公差, 公差图, 数字化协调