Railroad flat car underframe and method of making the same

Abstract

The invention provides a railway flat car underframe and a manufacturing method thereof. The railway flat car underframe comprises: a transversely extending crossbeam, and a middle beam longitudinally penetrating through the crossbeam, the crossbeam and the middle beam respectively include a top crossbeam cover plate and a top middle beam cover plate, and the crossbeam cover plate includes a The sub-cover plates on both sides of the center sill cover plate, the sub-cover plates are welded and fixed to the center sill cover plate, and the front and rear sides of the cross beam cover plate form a longitudinal extension of the center sill cover plate The curved transition surface of the smooth joint of the sides. The railway flat car underframe of the present invention optimizes the stress state at the joint between the cross beam and the middle beam, effectively avoids stress concentration, improves the fatigue life of the weld, and can further prevent part of the stress value from rising to the yield of the cross beam limit, thereby improving the bearing capacity of the beam and avoiding the deformation and failure of the beam.

Description

technical field [0001] The invention relates to railway vehicle manufacturing technology, in particular to a railway flat car underframe and a manufacturing method thereof. Background technique [0002] Railway flat cars are generally used to transport containers and other goods, and their underframes, as the load-bearing matrix, have high requirements for structural strength. [0003] Figure 1A It is a top view of the underframe of a railway flat car in the prior art, Figure 1B for Figure 1A main view of ; such as Figure 1A and Figure 1B As shown, the underframe is generally formed by welded laterally extending end beams, cross beams 2, longitudinally extending center beams 1, and side beams. The two side beams are symmetrically arranged on both sides of the center beam 1. At the front and rear ends of the side beams, the cross beam 2 is located in the middle of the middle beam 1 and fixed by welding with the middle of the middle beam 1 . The center beam 1 is a long...

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Problems solved by technology

[0004] For the railway flat car, the crossbeam 2 is located in the middle of the underframe. When the railway flatcar transports the container, the crossbeam 2 needs to bear the weight of two containers, which is a position with high load requirements. However, the existence of the above-mentioned bosses will cause Stress concentration occurs at the convex edge of the boss, and the fatigue life of the lead wire welding is also more likely to reach the yield limit of the beam, which leads to deformation and failure of the beam

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