Research On Aircraft Sheet Metal CAD/CAPP Integrated System Based On Geneticalgorithm

Under the challenge of the new environmental situation at home and abroad,the "Made in China 2025" plan requires China’s manufacturing enterprises to reform toward innovation,intelligent,high-end,and networked.Aircraft manufacturing as a representative of high-precision manufacturing industry,the aviation industry is increasingly complex with aviation technology of aviation parts.Especially the aviation sheet metal parts are the most prominent.However,the existing domestic product description methods,manufacturing methods and process design strategies for aviation sheet metal parts have been unable to meet the demand for efficient,prolific and quality maintenance of aviation sheet metal manufacturing,resulting in serious conflicts between manufacturing methods and actual production,derailing from the advanced technology of modern aircraft manufacturing abroad.Gradually become one of the bottlenecks restricting China’s aircraft manufacturing industry to carry out industrial innovation and reform,improve production efficiency,and enhance corporate vitality.As an important part of the aircraft,according to statistics,sheet metal parts account for 30% to 50% of the total aircraft parts,and its manufacturing and production working hours account for nearly 20% of the total manufacturing time.However,at present,most of the 3D design software for parts products on the market are general-purpose software.The design software for aircraft sheet metal is relatively small and mostly based on foreign sheet metal manufacturing standards that do not meet the requirements of domestic enterprises.The CAPP system is one of the few.Therefore,the main research purpose of this paper is to build a CAD / CAPP integrated development system for modern aircraft sheet metal parts,and to solve the urgent domestic demand for customized and localized aircraft sheet metal part design platforms.The main research methods are:(1)This paper takes the most widely used and typical frame rib parts in aviation sheet metal parts as the research object.extensive collection of frame rib parts manufacturing knowledge.In CAD,based on MBD technology and feature parameterized design method as a means,build a full 3D digital MBD data model of the part,and realize automatic modeling through secondary development of 3D software.(2)Based on the MBD information model,the feature features are automatically identified and feature information is extracted and stored in the part information knowledge base.(3)In terms of CAPP,combining the knowledge of complex network theory in the computer field,applying network methods and research methods to mechanical parts,and deeply exploring the internal relationship between the mechanical structure of parts and their processing processes,combining network modify with genetic algorithms to achieve intelligent process decisions for part features.(4)In addition,the optimization of the processing route of the ribbed part hole group is studied separately,and the hybrid algorithm based on ant colony-particle group combination is proposed to solve the optimal processing path.Finally,integrating the CAD/CAPP module,and designing the human-computer interaction GUI interface to complete the integration system designing.