Stretch-bending molding process of angle steel component of vehicle body
A technology of stretch bending forming and angle steel, which is applied in the field of metal stretch bending forming, can solve the problems that affect the forming quality of stretch bending forming parts, the manufacturing accuracy of car body, and the difficulty in controlling the dimensional accuracy of bending parts, so as to ensure the forming quality, improve the forming precision and realize The effect of displacement
Active Publication Date: 2012-06-27
白城市瑞程汽车部件有限公司
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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
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[0034] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0035] Based on the rotating arm type stretch bending workbench, the loading sequence of stretching-bending-stretch forming is adopted, and the loading mode is controlled by force and displacement cooperatively. Apply a pulling force of 1.25N before bending 0 , held constant during bending, after which 1.5N is applied 0 supplementary pulling force.
[0036] (1) Determination of the springback amount of the profile length of multi-curvature parts
[0037] Considering springback, the relationship between mold curvature radius, part design radius and springback radius can be expressed as
[0038] R mi = R di -ΔR i (1)
[0039] where R mi is the radius of curvature of the mold, R di Design radius of curvature for the innermost layer of the profile, ΔR i is the rebound radius of curvature.
[0040] will ΔR i =KR mi Substitu...
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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 stretch-bending process for car body angle steel components, in particular to a stretch-bending process for rail passenger car body components, and belongs to the field of metal stretch-bending forming. Background technique [0002] Metal profile stretch bending forming technology has become the 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 difficulty in controlling the dimensional accuracy of the bent parts caused by springback. Seriously affects the forming quality of the stretch-bending formed parts and the manufacturing precision of the vehicle body. Therefore, in order to further improve the quality and precision of metal profile stretch bending, it is necessary to study the bending forming mechanism in depth, grasp the springback amount of the material in a...
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IPC IPC(8): B21D7/02
Inventor 刘玉梅曹晓宁韩锋熊伟谷铮巍苏建卢凤英李雪海崔丽姜姝
Owner 白城市瑞程汽车部件有限公司