Abstract
Taking the frame of large-scale mining dump truck as the research object, it established the model of coupling or not of T-joint welding root by the finite element analysis, and analyzed the deformation of coupling or not of T-joint welding root. The deformation trend of the two cases is the same, which verifies the correctness of the prediction results of deformation. The results show that the maximum deformation occurs at the arc starting welding of the vertical plate, and the error between the simulation results and the test results is small. At the same time, the deformation error of gantry frame and hinge-hole at the key position can meet the production requirements, which is of great significance to the field production.
Highlights
Due to the characteristics of heavy load, large volume and bad working conditions, large-scale mining dump trucks have high requirements for structural design and process quality
Much welding procedure qualification tests provide guarantee for joint performance, but in the welding process of large frame, the realization of welding procedure will be different according to the site environment temperature, fixture, blanking accuracy, welding quality, welding quality, welding assembly sequence, etc
For the production of large-scale mining dump truck frame, the length dimension of the frame in the longitudinal symmetrical plane direction is up to 12 meters, the deformation of the key position is about 10 mm, and the error is controlled within 18%, which can meet the production requirements
Summary
Due to the characteristics of heavy load, large volume and bad working conditions, large-scale mining dump trucks have high requirements for structural design and process quality. The welding structure design is reasonable [1,2], which can effectively control the welding deformation and residual stress to maximize the carrying function of large mining dump truck. To minimize the impact of production consistency on the frame welding quality, only relying on traditional on-site experience accumulation and other means cannot meet the cycle requirements of large-scale mining dump truck frame renewal; welding simulation technology has become an effective means. For the large-scale mining dump frame, the typical joint root node coupling model is established, and the deformation analysis is carried out; based on the thermo elastic-plastic theory, the deformation is analyzed, and the deformation results measured by the experiment are verified
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