Research On Template Design Of Automobile Panel Based On CATIA Platform

Traditional design pattern of automobile panel die is one of the main factors that affect the manufacturing cycle of automobile die, because it has an excessive reliance on artificial experience, and has low efficiency and poor quality. In order to solve this problem, the CAD system for mold design is widely used to improve the design quality and shorten the design cycle. But there are a large number of repetitive operations on mold design method based on general CAD system, and the effect is still limited. In the future the trend of mold design is standardization, intelligence and specialization. And mold design method based on parameterized template conforms to this trend.This dissertation analyses the current applying situation of existing systems deeply, and put emphasis on chaotic management of data, inefficiency of parameter adjustment and poor effect in knowledge reusing. Combined with the project of "4th mold design system" of SAIC Volkswagen, a new type of fully parameterized method for mold design based on the template is proposed on CATIA platform. This method can restructure a new set of mold only with surface replacement and parameter adjustment.In order to solve the problem that the data on CATIA platform occupies large space and the network storage is difficult, a C/S network model is used to construct the template data storage scheme based on the file system through the division of mold properties. The network transmission rate is optimized, which solves the problem of data synchronization and version management brought by the network storage. These lay the foundation for the mold design system.As a result of the poor quality in generating structure from surface directly and the low success rate of synchronous updating after replacement, a hierarchical modeling method based on CATIA publishing mechanism is proposed through in-depth analysis in difficulties of structure update and the deficiency of existing replacement methods. This method separates the surface design and structure design, which avoids the failure of the structure modeling due to the failure of the surface update. It can improve the success rate of the replacement effectively.There are a large number of parameters in the parametric template dispersedly, which leads to the low efficiency of parameter adjustment and low knowledge reuse rate. In order to solve these problems, a parameter transfer mechanism based on the formula is constructed after the summary of domestic scholars' research on parameterization and knowledge based engineering. On the basis of this mechanism, the object oriented library of quantitative rules is established with parameter object as the core, using CATIA rule editor and program development. And finally, the life cycle management of parameter object based on knowledge based engineering is realized.At the end of this paper, the realization of each module and the navigation process are introduced in detail. By using the system to design molds of typical cover products, such as the front cover plate, the feasibility and practicability of this system is verified, compared with the efficiency of the traditional mold design pattern.