Abstract: In view of the problems of inspection, analysis and management of annotation in 3D environment, the present study proposed the concept and construction method of error transfer relationship graph of part geometric elements based on solid models. First, the sub graph of error transfer relationship was established according to the datum-target relationship between geometric elements associated with geometric tolerance. Then, the datum-target relationship between geometric elements associated with dimension tolerance was determined according to the geometric elements’ types, location relationships and location information of dimension lines. Thus, the directionless dimension relationship between geometric elements was transformed into the directional error transfer relationship, increasing and expanding the error transfer relationship sub graph. Finally, the error transfer graph of the whole part was constructed. Based on the secondary development function of the software SolidWorks, the prototype software was developed with VC++, and the feasibility of the method was verified through exemplification.

Key words: error transfer relationship graph, geometric tolerance, dimension tolerance, datum-target relationship