In China, most of the molding technology and mold design of automotive panels still rely mainly on the experience of designers and rely on certain qualitative theoretical analysis and empirical data. Not only does it take a long time to design, it cannot keep up with the pace of the international market, and it is difficult to determine the impact of various parameters on the stamping process. After the design, it must be modified repeatedly in the trial mode, which consumes a lot of material and financial resources. Even many large molds still need to be introduced. . Group companies like FAW Group also rely on the import of advanced CAD/CAM systems and equipment to produce high-quality, high-precision cover molds. China's specialized cover mold CAD/CAM system is still basically research and trial in colleges and universities, there is no molding system. Universities that have made achievements in this area, such as Huazhong University of Science and Technology, Jilin University of Technology, and Shanghai Jiaotong University, are still in their infancy.
Looking at the development history of the world auto industry, we can see that the car is gradually developed along the chassis 0y/engine 0y/body 0 gradually. Judging from the domestic and foreign automobile production practices, the chassis and engine production technology is maturing. The development of the vehicle production capacity depends on the production capacity of the vehicle body. The replacement of the automobile depends largely on the vehicle body. In the saturated state of the basic model, only the remodeling or modification of the body can be used to open the outlet. Modern automobile body modeling technology has also gradually matured. The body modelling has fully considered the aerodynamic and aesthetic requirements, giving the car a rich sense of the times, and its surface requirements are smooth and beautiful.
The automobile cover refers to the surface parts and internal parts that cover the engine and the chassis and constitute the steel sheet special body of the cab and the vehicle body, including three parts of the outer cover, the inner cover, and the support. Compared with general stampings, the covering materials are thin, complex in shape, and mostly space curved surfaces, and the structure size and surface quality are high. Moreover, in order to improve the appearance and rigidity of the vehicle body, it is necessary to design ridges, ribs, bulges, and other shapes on the cover to further enhance the complexity of the profile. At the same time, the cover is a non-linear, elasto-plastic, and large-scale process in the stamping process. Only by means of CAD/CAM technology, can we understand the deformation and flow conditions of the blank during the stamping process, so as to prevent wrinkles and wrinkles on the covered surface. Process defects such as dents, and severe process problems such as cracking, spring back, etc. In fact, CAD/CAM technology has become an important guarantee for developed countries to produce beautiful, cheap, and high-quality automobiles. In the entire cycle of model design, mold design and debugging, mold design and manufacture take about 2/3 of the time. Therefore, the application of the cover mold CAD/CAE/CAM technology has played a key role in shortening the development cycle.
Cover mold CAD/CAM integration program At present, China has introduced a lot of foreign large-scale CAD/CAM systems. In view of the development of the domestic auto industry, we have made extensive investigations and researches, and made overall plans for CAD/CAM integration solutions for automotive panel molds. The topological relationships are as shown. The system relies mainly on general-purpose CAD/CAM software to develop and develop a complete CAD/CAM integration system for automotive panel molds and design several functional modules in the system.
The discrete point data of the master model of the data acquisition cover is usually measured by a coordinate measuring machine. The CAD software reads these discrete point data through an interface program. However, because of the large amount of data that cannot be used in practice, it is often necessary to reduce the amount of data by using node simplification to achieve practical application. Then, in the AutoCAD environment, these simplified discrete point data are converted into a visual surface wireframe.
Smooth surface smoothing covers generally require a smooth surface, which can not only reduce the air resistance during driving, but also satisfy the user's requirements of the body's beautiful and elegant viewing effect. Before surface fitting, smoothing must be performed on various types of points so as to fit a high-quality cover surface and lay a foundation for subsequent work. The general CAD software does not have a module for smoothing discrete point data. Even with such a module, it is difficult to achieve satisfactory results. Therefore, in order to fit a high-quality fairing cover surface model, the collected discrete point data must be smoothed.
Conclusion Automobile covers are the main components that make up a car body. Most of them are space curved shapes with large outline dimensions, so it is difficult to develop cover molds. In China, most of the work of car cover mold design mainly depends on some qualitative theoretical analysis and empirical data of the designers. Not only the design time is long, but also the influence of various parameters on the stamping molding is difficult to determine. After the design, it must be repeated in the test mode phase. Modifications consume a lot of material and financial resources. Most of the large-scale CAD/CAM systems introduced in China are general-purpose software. In the process of designing and manufacturing the cover parts, they often cannot meet the actual needs of production. Therefore, based on feature product modeling and secondary development of the mold design and manufacturing field, you can use the powerful features of existing commodity software, save a lot of time to develop grassroots software, and thus establish a set of suitable for domestic automotive panel mold design A complete CAD/CAM integration system is manufactured, which promotes the development of the automotive industry efficiently, quickly and steadily.
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