Research on the Intelligent Annotation Technology of Geometrical Tolerance Based on Geometrical Product Specification (GPS)

To solve the problem of geometrical tolerance annotation in CAD software is not in conformity with the requirement of the new generation Geometrical Product Specification (GPS), an intelligent annotation module of geometrical tolerance which is integrated seamlessly with Creo software is developed. In the developed module, the new annotation requirements of geometrical tolerance, such as intersection plane, orientation plane, and collection plane, are provided, and their application rules are given. The design rules of geometrical characteristics are put forward based on invariance class provided by the new generation GPS, and the relationship between geometrical tolerance zone and the additional symbols is established. By using of building standard symbols library, inquiring of geometrical tolerance value automatically, and simplifying user interface, the intelligent and convenience geometrical tolerance annotation is realized. The case study indicates that using the developed module make the geometrical tolerance annotation in CAD software easier and more convenient.