Development on CAD/CAPP Parametric Design System of Tra in Axle

Abstract

Abstract.With the train axle product as the research object, based on analysis of the functional needs of the CAD/CAPP parametric design system of train axle, the overall functional framework of the system is decided, and the Unified Modeling Language (UML) activity diagram of the system is designed. The parametric design methods of the system are discussed, including the shaft shape features and parametric programming, the establishment of feature drawing function. Based on Visual Basic 6.0 programming language and SQL Sever database technology, the CAD/CAPP parametric design system of train axle is developed, and an application example is given. The application result shows that the system is easy to operate and significantly saves the design time of the product. The format of its generated drawings is unified, and accords with the national standard specification. IntroductionAt present, the products of domestic manufacturing enterprises are stable, and the daily product design mode of enterprises is usually to modify the existing similar products according to customer needs [1]. Because of the customers' individual and diversified demand for the train axle product, the modified design based on the basic product involves a lot of tedious drawing design and process design work, and its design efficiency is low and easy to make mistakes. The traditional interactive computer drawing is difficult to meet the needs of custom-made production. It is necessary to use CAD and CAPP parameterized technology to realize the rapid design of the product, in order to shorten the design cycle and improve the efficiency and quality of the design.In order to study the stress field of axle, the visual data checking of axle was carried out in Southwest Jiaotong University [2] based on OpenGL technology, and a parametric modeling system of axle was realized by modularization idea. However, the parameterized modeling function of the system is only for the main parameters of the axle, and lacks the automatic drawing function of the intermediate process in the manufacturing process of the axle.Aiming at the deficiency in reference [2] and the actual demand of a train axle manufacturing enterprise, this paper puts forward the overall functional framework of the CAD/CAPP parametric design system of train axle and the work flow model of the system. Then, this paper focuses on the parametric design methods, including the shaft shape feature and parameter planning, the construction of the feature drawing function and so on. Finally, the CAD/CAPP parameterized design system of train axle is developed, and the parameterized design of train axle and automatic generation of engineering drawings and process drawings are realized.

The Modeling and Using Strategy for the Digital Twin in Process Planning

“…Process specification is a technical document for the manufacturing process and operation method of the product [4]. It is not only a disciplinary document that all production personnel should enforce strictly and implement conscientiously, but also the basis for product preparation, production scheduling, worker operation and quality inspection.…”