Authors: Zhengwei Gu Mengmeng Lv Xin Li Hong Xu
Publish Date: 2015/10/31
Volume: 85, Issue: 5-8, Pages: 1053-1061
Abstract
To achieve highprecision bent components for rail vehicles the stretch bending properties of the common Lsection aluminum extrusions with variable contour curvatures were investigated by simulation The causes of the defects such as bad die fittingness crosssection distortion of horizontal plate sagging and low contour accuracy were analyzed and the corresponding control methods were proposed The simulation results demonstrate that die fittingness could be significantly improved by increasing the die elongation The horizontal plate sagging distortion of Lsection aluminum components could be eliminated by modifying the die supporting surface curve ie to reduce the depth from the die’s outer surface according to the shrinkage of the profile’s vertical wall By applying suitable springback compensation to the bending die geometry the contour accuracy could be enhanced exponentially Using the optimal process parameters and defect controlling methods the stretch bending tests were then carried out and results indicate that the proposed controlling methods were quite effective and the scale production of highprecision bent parts has been achieved
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