Stretch-bending molding process of angle steel component of vehicle body

Abstract

The invention relates to a stretch-bending molding process of an angle steel component of a vehicle body and mainly aims to scientifically and rationally overcome the defects of overlarge rebound modulus and section bending deflection of workpieces and the like during the stretch-bending molding of the angle steel component of the vehicle body. The process realizes the emulation of pretension and post-tension corresponding to the minimum rebound modulus, provides a computing formula for the initial length of profiles and a trajectory model of a clamp, improves the forming quality, precision and work efficiency of a stretch-bending workpiece and the manufacturing quality of vehicle steel structure, reduces the manufacturing and maintenance cost, overcomes stretch-bending defects and provides basis for the stretch-bending molding precision control of profile parts. The process initially establishes a mathematical model for length rebound modulus of a multi-curvature profile, can precisely determine the initial length of a blank profile of parts, determines the optimal pretension and post-tension by a simulation method and precisely determines the trajectory of the clamp by establishing a multi-curvature profile stretch-bending module, thereby obtaining the ideal forming quality of the formed profile.

Description

technical field [0001] The invention relates to a drawing and bending process for body angle steel members, in particular to a drawing and bending process for rail passenger car body components, which belongs to the field of metal drawing and bending. Background technique [0002] The stretch-bending technology of metal profiles has become a key and difficult point in the manufacturing process of rail passenger cars and other vehicles. In the stretch-bending process, there are defects such as excessive buckling deformation of the bending section and the difficulty in controlling the dimensional accuracy of the bending parts caused by springback. It seriously affects the forming quality of the stretch-bending parts and the manufacturing precision of the car body. Therefore, in order to further improve the quality and accuracy of metal profile drawing and bending, it is necessary to deeply study the bending forming mechanism, grasp the springback of the material in advance, de...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a stretch bending forming process for car body angle steel members to overcome the difficulty in controlling the dimensional accuracy of bent parts caused by excessive buckling deformation and springback in the bending section in the existing metal profile stretch bending forming process and other defects, which affect the forming quality of stretch-bending parts and the manufacturing accuracy of the car body, and provide a theoretical basis for metal profile stretch-bending technology

Images