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Due to the complexity of the original design structure, the necessary simplification through modeling [2], 1. sliding pad assembly; 2. upper positioning and cylinder assembly; 3. slider push cylinder assembly; 4. welding frame; Mounting workpiece; 6. Dovetail guide; 7. Workbench and positioning block assembly; 8. Displacement sensor assembly; 9. Lower floating positioning assembly; 10. Push-up cylinder assembly; 11. Load cell assembly locomotive axle gear press-fit machine structure The establishment of the model and its analysis and improvement of the original model have a total of 14013 10-node tetrahedral units and 28518 nodes.
The finite element model of the original structure is solved on the ANSYS software platform. In post processing, the magnitude of the stress value is expressed in color. The analysis results of the original mold are not ideal. The stress value of the weld at the top of the frame is 231.215 MPa, and the distribution is uneven. The upper stress value of the frame is 154 MPa. The original model is shown.
The stress map of the original model starts from the weak link of the original model, adopts the top plus rib, the upper part of the tiger mouth adopts the arc transition, and establishes a new finite element model. The improved model has a total of 14878 10-node tetrahedral elements and 30288 nodes. . The finite element model is shown.
The improved finite element model of the improved model is analyzed as shown in the figure. The depth of the color in the figure corresponds to the magnitude of the strain and stress. Under the maximum load required, the maximum deformation point displacement is 1.493mm, the maximum stress point is located at the top weld of the frame body, and the distribution is uniform, which is 143.368MPa; the stress value at the arc of the tiger's mouth is significantly reduced, and the maximum stress value does not exceed 110MPa. The results show that while satisfying the press-fit accuracy, the material properties are also satisfied [4].
At the same time, the weld near the loading area above the frame is the focus of the problem. In addition to the maximum stress, the wear caused by the slider is also considered. The deformation diagram of the improved model improves the stress conclusion of the model. It is found that the stress and deformation analysis of the finite element model of the frame can reasonably reduce the stress and local deformation at the top of the frame. Reasonable opening of the frame body can reduce the weight of the whole machine and improve the processing technology under the premise of meeting the design requirements.
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