UML Modeling and Parametric Design for Cross Shaft Universal Coupling CAD System

In order to realize rapid custom design for cross shaft universal coupling products, enterprises need a parametric CAD system. On the basis of analyzing its functional requirements, this paper proposed the overall functional framework of cross shaft universal coupling CAD system, which mainly includes user management, product drawing, product design, document management and technical interface functional modules, etc. Based on UML modeling method, analyzed its use cases models, key class diagrams and activity diagrams of the CAD system. Then, by using Visual Basic 6.0 ActiveX Automation technology and SQL Server database technology, a parametric CAD software for cross shaft universal coupling was successfully developed, which has been used in enterprise’s design. Its application shows that the parametric CAD software is convenient to operate, and can rapidly realize parametric design of cross shaft universal coupling parts, so it helps to reduce the labor intensity of designers, and improve the quality and efficiency of design.