Aircraft Structural Parts Fixture Auxiliary Assembly System

Aircraft structural parts are important parts that constitute the frame of the aircraft body,and they are various in variety.Machine tool fixtures are important tooling to ensure the quality of their machining.In the aviation manufacturing industry,the design and management of aircraft inter-assembly fixtures have problems such as low automation,long production cycle,and difficulty in the retrieval of fixture components.In view of the above problems,this paper studies the auxiliary assembly method of aircraft structural parts fixtures.The main contents are as follows:Firstly,the structural characteristics and processing requirements of the frame,beam and rib structural parts in aircraft structural parts are introduced.The various methods of CATIA secondary development,CATIA secondary development interface,object-oriented programming architecture and The structure of the software components,discusses the internal structure of CATIA,the general steps of operating the component documentation and operating product documentation and the basic process of secondary development,as well as analyzing the advantages and disadvantages of the secondary development methods.Secondly,the development steps and processes of parametric design are introduced,and the important codes in the development process are listed in detail.The external meshing gear is taken as an example to verify the feasibility of the parametric modeling scheme.At the same time,a standard parts library was established,which explained the construction plan and process.Taking the cylindrical head adjustment support as an example,the establishment process of the cylindrical head adjustment support component library was described in detail.Thirdly,this paper introduces the design criterion of coding system and the relationship between adjacent code position,explains the file format of coding system,the design process of the program and the establishment process of fixture assembly,and discusses in detail the process of using a coding system to automatically encode the fixture parts and the modification and replacement of parts coding.Finally,the precondition,structure object,two-dimensional geometric object,two-dimensional constraint object,annotation object and generating view are introduced.The production flow chart of engineering drawing is drawn,and its concrete operation steps are explained.In addition,according to the disadvantages of the traditional clamping mechanism,a clamping mechanism is designed,and the working principle of the clamping mechanism is described in detail.The clamping mechanism is assembled in the aircraft structural parts,then the transformation from three-dimensional drawing of two-dimensional engineering diagram is made,and the drawing frame and technical requirements are added to the engineering drawing,meanwhile,the corresponding attributes are added to the parts and the detailed list is generated.