Research On Parametric Design Of Die For Automobile Panel Based On NX

Auto cover panel stamping die is the main process equipment in auto body part manufacturing. The Length of its design and manufacturing cycle and quality immediately will directly influence development cycle of new vehicle, quality and competitiveness of vehicle. Compared with traditional two-dimensional design, the parametric three-dimensional design is more intuitive, It can drive geometry by dimension parameter to modify the model and improve design efficiency. The designers can take static interference analysis, dynamic interference analysis and check strength on die structure in the three-dimensional CAD system. These analyses can guarantee quality of die design. The three-dimensional model can be used in processing directly. At present domestic die industry mainly use two-dimensional design, but in the overseas three-dimensional design already became the primary task to design die.Through analyzing the typical die's structure, mold consists of the main features, auxiliary features and standard parts. The main feature is the main part of die structure. Auxiliary feature is the decoration part based on the main feature. Using the NX mold design tools to create main features, Auxiliary features using OPEN API development process based on NX, so designers can design modules in part under the same command as the use of NX to create and edit common secondary feature.The utilization rate of standard part in mold can reflect the die industrialization level. Using standard part can improve efficiency and level of die design and degree of standardization. Although the professional standard part company will provide three-dimensional models, but the model files are saved according to internal product code, there is no argument, then the designers takes a lot of time to find the standard parts, and it is difficult to change model. Using NX parametric design and standard parts management tools build common 3D standard parts library, and through standard parts management tools management the standard parts. By the same way, create typical die base bottoms. The designers can easily and quickly use and modify the model by the standard parts library and die base bottoms.Finally, taking the auto Hood Outer panel as an example, using the NX mold design tools, the development of standard feature in the issue, the standard die base bottoms and 3D standard parts library, create three-dimensional model of the die based on the mold assembly environment. Through the NX analysis functions, check interference analysis on die structure and the reasonableness of the die structure design. From the example of the design process can be concluded that, use the process developed in this paper and three-dimensional standard part library can greatly improve the efficiency of die three-dimensional design and quality, allowing designers to focus on die structure of the overall design, without having to repeat the design standard structure and standard parts.