| The Over-loading wagon body is the part for loading cargo, and its security is the safeguard of goods transport. With the rail freight transport development approaching "high-speed, heavy-duty", the requirements of the carrying capacity, the shape and appearance and the safe operation are increasingly high. Therefore CAE technology in the vehicle field has been widely applied. Before production,CAE technology can be employed for the calculation of body static strength and dynamic performance analysis and stability analysis, through which the structure weakness can be found in order to improve that. Besides, predict and control the deformation of welding units. These have important significances of guiding for the design, production and enhancement welding quality of trucks.On the basis of studying the development of the body analysis technology, using the easy-to-digest research strategy and the C80 specific-coal-gondola as the research object, carried out a series of in-depth'study, from the static strength analysis, modal analysis, stability analysis to prediction of welding deformation. To sum up, this paper studies are:(1) Applied the software I-DEAS to establish the geometric model and finite element model of the C80 body, and calculate the equivalent stress and bending stiffness of the body under three working conditions. The results meet the norm requirements.(2) Research on the body stability and modal. The body has lower vibration mode, the first mode is the whole body torsion mode and the frequency is 4.586Hz. In the buckling analysis, the side wall panels and floors occurs buckling under 2800KN compression load. So established beams in instability region to increase the vehicle longitudinal stiffness. Then the stability of the body was enhanced.(3) By using of the inherent strain method, forecast the welding deformation of the side-wall. Under the existing structure and welding process conditions, the side wall deformation results are consistent with the measured. That verifies the correctness of the simulation model and demonstrates the inherent strain method is a fast and effective way to predict welding distortion, and can be applied to the prediction and control deformation study of the vehicles Welded structure.(4) In order to well control the welding distortion of the side-wall, various structural and welding parameters which have impact on welding deformation have been studied, including:â‘ The study of the jamb form to side-wall welding deformation influence, Obtains the hat section jamb to be more advantageous than the trough section jamb in reduces the welding deformation of the side-wall;â‘¡By using the orthogonal test, carrying on the orthogonal test design to the welding parameter which affects the welding deformation, obtains most superior allocated proportion of the parameter. The result indicated that the thickness of planets is biggest factor to welding distortion results. If the thin steel plate is thicker, the welding amount of deformation is smaller. The next factors are voltage, welding speed and electric current. In all experimental levels which were provided with, may obtain the smallest welding deformation when takes the thickness 5mm, voltage 24V, electric current 180A and welding speed 600mm/min;â‘¢In the studying of the spans distribution and the thin steel plate splicing plan to the distortion influence's research, discovered that component's different rigidity assignment will cause the different welding deformation under the same welding condition; the different thermal distributions will also affect the final welding deformation. Therefore the control welding deformation should overall evaluation welding heat input value and the thermal distributed form, as well as the structure rigidity assignment. Welded joints should sparse somewhat in the smaller rigidity region to reduce the welding heat input, increase the overall rigidity of the side-wall and to reduce the welding deformation.
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