Profile-adjustable stretch-bending forming mold for stand column-like components of railway vehicles

Abstract

The invention relates to a profile-adjustable stretch-bending forming mold for stand column-like components of railway vehicles and belongs to the technical field of stretch-bending forming of metal profiles. A mold body is fixed to a stretch-bending machine, and the adjustable profile is fixedly connected to the mold body through a supporting block and side baffles; the side baffles and a bottomboard form a mounting framework; the side baffles are used for achieving left-right positioning of base bodies and limiting left-right deflection or turning of the base bodies in the stress process; and the base bodies are compactly arranged, the ends are limited by two end baffles which are limited in stop blocks of the mold body, and accordingly reliable positioning of the base bodies in the front-back direction is achieved. The profile-adjustable stretch-bending forming mold for the stand column-like components of the railway vehicles has the advantages that the stand column forming precision is improved, mold modification is not needed, and the adjusting and shaping procedures which are necessary during formation with a traditional stretch-bending mold due to poor quality precision ofstretch-bent parts are omitted, so that the production cycle is greatly shortened, the labor intensity is relieved, the production cost is reduced, and the working efficiency is improved; and meanwhile, the profile-adjustable stretch-bending forming mold is suitable for different stand column formed parts, is quite high in universality and has a quite great practical significance.

Description

technical field [0001] The invention relates to the technical field of stretch-bending forming of metal profiles, in particular to a stretch-bending die for rail vehicle column members with adjustable profiles. For the bending and forming of column-type profile members of rail vehicles. Background technique [0002] Rail transit is one of the most important modes of transportation in my country. Skeleton members on rail vehicles are generally relatively large in size, and stretch bending technology is mainly used for bending and forming of profiles. Stretch bending is a cold working method. The workpiece is subjected to tangential tension while bending, and the workpiece is shaped under the joint action of bending moment and tension. During stretch bending, the stress in the cross-section of the workpiece becomes dominated by tensile stress. Therefore, the stretch-bending workpiece has small springback, good part molding, high forming precision, and good surface quality. ...

AI Technical Summary

Problems solved by technology

[0004] The main defect of the stretch-bending forming of column-type components occurs at the arc connection, because compared with the straight section of the profile, the deformation of the arc is the largest, and the stress-strain change is the most complicated, so the cross-section distortion is large and the contour accuracy error is serious. These defects seriously affect the overall forming accuracy of the profile, and the subsequent adjustment and repair of the formed part is difficult, resulting in poor assembly accuracy with other components, reducing the accuracy and quality of the rail vehicle body structure

[0005] Traditional column stretch bending requires a set of special molds for each type of material. The cost is high and the cycle is long, and the mold surface is fixed and cannot be adjusted. The mold manufacturing cycle is long, and the man-hours and costs are huge. Secondly, in the stretch bending experiment adjustment stage, It is necessary to remove the stretch bending mold from the working platform and repair the mold repeatedly, and the production efficiency is very low

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