| The design and manufacturing time and quality of panel dies have direct effect on the development period, quality and competitive capability of new car. At present, universal CAD systems have been widely used in many factories to aid designing panel dies. However, the application was limited to geometric modeling and 2D drawing. These systems can not support design process to achieve function satisfaction, and can not support top-down design, which has seriously held back the improvement of quality and efficiency of design and manufacturing. Hence, the key technologies of function-oriented three-dimensional design of panel drawing dies have been studied in this thesis.Firstly, the structures and the functions of panel drawing dies are summarized in the paper, and a method of function-oriented panel drawing dies design is proposed to combine the function-oriented design and feature modeling together. The resolving methods of the main function and the mapping between function and structure were discussed also. The complicated design problem is simplified through resolving main function into sub-functions.The basic principles of function-oriented CAD for panel drawing dies are presented, and the concept of functional group components is brought forward.The key techniques for function-oriented CAD of panel drawing dies is elaborated. A panel drawing die part consists of three features, i.e. principal feature, strengthening feature and assistant feature, which divides the design of the panel drawing die into three steps, that is, principal feature design, strengthening feature design and the functional subassembly component design. The same design precess could been adopted in the design of the punch, die and binder, which laid a foundation for three-dimensional CAD of panel dies. The procedure of rib design is studied, and a practical rib design module is developed, combining interactive .and automatic design process together.A function-oriented three-dimensional CAD system of panel drawing dies has been developed on the basis of theoretical study. The system consists of five modules, i.e. project initialization, principal body design, interactive rib design, assembly design. |
