Research On A Parameterized CAD System For The Vehicle Bogie Frame

The bogie of railway vehicle is one mechanical system which running in the specific environment, it has unique engineering analysis. However, the bogie frame is a major part which is one of the most fully emboding the specific characteristics. Because the influence of specific factor, such as the using of vehicles is different,the difference of operating condition,the restriction of manufacture and service,and the economic efficiency and so on. For the bogie frame's performance, structure, parameters and the use of materials and processes having different requirements, thus it has led to a variety types of bogie frame. The main difference between various bogie frame is the structure and parameters of spring suspension system,the method of load transfer along vertical and lateral,the supporting of wheelset,the location of axle-box and the type and fixing of arresting gear and so on. Therefore, for enhancing the research,design and manufacturing standards of bogie frame, this article based on database technology,modular technology,parametric technology and advanced assembly technology, and used COM components technology to developing parametric CAD system of vehicle bogie frame in Visual C++ programming environment and the SolidWorks platform. It not only can improve the design quality and efficiency, but also can provide the model parameters of structural design,strength analysis and dynamic analysis.Vehicle bogie frame is a series of large-scale weldment with similar shape and function, but which have different structures. The reasonable selection of various sections is a basis of bogie frame design. By comparing the methods of mechanics of materials,the principle of force method and the finite element method, this article selected the principle of force method of structural mechanics to a preliminary selection of design.Through analyzing the present situation of CAD application in the vehicle, The system used the three-dimensional mechanical design software SolidWorks 2007 for the operating platform. And used Visual C++6.0 to carry on secondary developtment, namely carried on the characteristic parameters of the graphics programming and user interface design. Used the method of parameter-driven to achieve parametric design of side beam and the beam of bogie frame. Arounding the Visual C++ database technology and interactive interface technology, the system established toolbar,menu bar and interactive dialog with the Windows operating style. Meanwhile a lot of information tips and fault tolerance added to the system, which makes the system easy to operate. This paper based on analyzing and comparing various secondary development interface. With bogie frame's character, the system seek high efficiency and high speed as a goal. Using ATL COM Wizard to develop the plug-in of vehicle bogie frame.According to the structural character of the bogie frame, the system used a local correction method to adjust the side beam and beams of bogie frame to the final model. And the system has built the parts library. Through advanced assembly technology to assemble the side beam,beams and bogie frame. After completing the above process, the files in Parasolid format can be exported. Thus it conducts the following analytical study. This system can greatly reduce the design cycle of bogie frame and improve the efficiency of product design. So it has the important value of science and practical project.