MBD- and GPS-based Workpiece Coordinate Measuring Information Representation Modeling

摘要

Measuring information representation modeling seeks normative representation of relevant information in the workpiece coordinate measuring and serves as the theoretical foundation of measuring information extraction and Computer-Aided Inspection Planning (CAIP). Model-Based Definition (MBD) technology represents the latest development of CAD technology and new-generation Geometrical Product Specifications(new-generation GPS) under development is one of the most important technical standards in the product manufacturing field, both providing workpiece coordinate measuring information description and representation with the technological environment and application requirements different from before. In this paper, regarding the MBD dataset of workpieces and coordinate measuring requirements, in combination with the surface model and the geometrical feature defined as the geometrical representation model in new-generation GPS, tolerance items, geometrical features, and model datum/coordinate system are considered as constituents of measuring information. Out of the categorization of the surface model and the geometrical feature by invariance class, relevant measuring features are defined through tolerance annotations. Measuring information representation modeling is to express constituents of measuring information and their relationship. This paper also presents the process of relevant measuring information extraction based on the measuring information representation model and verifies the rationality of relevant modeling representation and the feasibility of the extraction flow using an instance.