关键词: 基于模型的定义, 数据集, 三坐标测量机, 检测信息获取, 公差项目, 几何特征

Abstract: To acquire parts coordinate measuring information in 3D environment,the application of Model Based Definition (MBD) technique in the measuring information acquirement with MBD dataset representation as the acquiring object was discussed.Through analyzing the structure of inspection information in MBD dataset,the relevant geometric information was defined on the basis of tolerance annotation.The tolerance items,relevant geometric features and model datum/coordinate system were taken as the measuring information constitutive elements to define the related relationship,and the representation model of parts measuring information based on MBD dataset was established.According to measuring information composition and representation model,the process of parts inspection information identification and extraction was determined.Through customizing the corresponding data extracting tool in 3D Computer Aided Design (CAD) software Pro/E,the parts inspection information acquiring method and process with respect to MBD dataset was presented with an acquiring example.

Key words: model based definition, dataset, coordinate measuring machine, inspection information extraction, tolerance items, geometric feature