Parts Of Aircraft Frame Rib Curved Edge To Expand Research And Development Of The Cad System

Aircraft sheet metal component (SMC) is often used as ribs of airfoil or bulkheads of airframe and other framework parts. For a long time, the flat pattern development(FPD) of aircraft SMCs have been carried out by the manual computation primarily or according to experiences of workers, which keep more extra material for trimming after forming, so the efficiency is low. At present, there is no special CAD system available for the FPD of aircraft SMCs, because most aircraft SMC are complex public domain method for FPD is rather unsuitable for complex aircraft SMCs and published methods for complex aircraft SMCs is limited in number.In this paper, author first analyzes the special features of aircraft SMCs, then design and develop a CATIA V5 based automated FPD system for aircraft SMCs. In addition, provides practical methods of FPD for aircraft SMC, which can be used in the FPD for straight flange, curve flange, double flange and multifold flange. The system may realize the automation of FPD for aircraft SMC and enhance the efficiency of loft generation greatly.The precision calculation of FPD for aircraft SMCs is an important tache to ensure the high quality of products. This paper lucubrate the practical methods of FPD for aircraft SMC and provides some unique and new development algorithm. The SMCs based on their geometric features are classified for the first time in this paper and provided appropriate FPD algorithm as well as the highly effective accurate processing flow for each kind of components. Based on these methods and processing, automated FPD CAD system for aircraft SMCs are designed and developed.This paper also provides processing methods for the aircraft SMCs specific geometric features, such as symmetry, pilot hole, bend relief and so on, in this foundation, the corresponding post processing subsystems is designed. Moreover, the computation simplification algorithm and processing of the bevel value is presented in the paper.Finally, this paper illustrates the FPD of each kind of typical components by system and the results confirm that the system is accurate.