Based On Unigraphics Modeling And Simulation Analysis Of Design Of Working Equipment Which Is Used To Rotate A Large-scale Military Vehicle For Convenient Welding

As we know,the car body of Special vehicle have feature as follows:first,it is large in size and heavy in Weight. Second,it is strict in quality control of the welding line on the car body .third,the precision of finished Automobile must be accurate.All this make it difficult to do welding on the car body. Special vehicle is in limited quantities, it is not suited to bring in production line from overseas,which will increase costs of making the product.On the other hand,if we do it by manpower,we can't come up to the criterion and that will burden worker's intensity of labour.what's worth we can't meet meet the qualification.So we must design a working device to solve the problem. This device must have good economical and practical feasibility and high practicability, absolute reliability and safety.Considering of all those requirements above, we sketch out two design proposal, and made two sets of the total work device assembly as the initial concept design using the software of Auto CAD. And do coMParison of two schemes from the aspects of feasibility, practicability of economy, safety, reliability .In the end ,we take finally options (namely driving wheel factory) as the final design and manufacturing solutions.In the past, we do design of large-scale complex tooling, we used to use the traditional design experience, experimental test method, due to the complexity of the structure, mechanical unbalanced distribution of structure,usually we cannot know local and overall strength in the design process, so we have to do optimize design by doing experiments many a time, it need for a long period and high cost, the design has been trial-produced struggled to adapt to the demand of the market. This method not only high-cost and long-period, but also trial-manufacture of multiple solutions may not be evaluated. Modern structural design has developed to include finite element method, the dynamic design optimization, the computer, the forecast and analysis and simulation stage, the CAE technology and equipment in the concept design for static and dynamic analysis, along with the further improvement of drawings, flip work device structure finite element model is further refinement, makes analysis and calculation results tend to be more accurate. When drawings completed, we can make whole after the device control strength, life index, greatly reduce the samples and time.The assembly drawing with CAD, using Unigraphics (UG) figure as software of 3D modeling, in order to avoid the reverse process of body gravity and the drive wheels center not overlap and lateral, we have to use its quality analyse module, and the weight of the hull size, and with the centroid position as a follow-up data, driving wheel of the finite element analysis model and necessary basis.After we get the centroid of bodywork, we can lay out two tectonic identical drive wheels, so that the two driving wheel yould at the same work environment and stress state, thus the tooling strength analysis problem is transformed into solving a problem to analyze one driving wheel strength.At last,we choose UG and Nastran combination as the software to do finite element analysis, analyses the superiority of the scheme, to use Nastran to stress analysis process and procedure is introduced, the drive wheels under different working conditions, GaiYing stress state to authentic, straightforward, judging the selection of material can meet the requirements for solving problems, and provides a powerful tools and methods.The initial set by the concept design for the ultimate size, when we take 45 steel as the material of driving wheels ,that stress map shows its strength is enough, strength of materials is superfluous. It is necessary to optimize design, namely into the drive wheels lightweighting design process.After reduce cross-section of driving wheels ,Main component selection for driving wheel of material selection and optimal specification sheet thickness after reducing, lightweight driving wheel structure, through different operating conditions, the simulation analysis shows that: moderate lightweighting design after treatment, the intensity is still driving wheel meets the requirement. Meet the demands on the premise, that ensure us to get the best product with minimum price.