Abstract
Extruded sections of aluminum have many advantages for lightweight structural members. A secondary forming process, such as bending, is required when these materials are used in these parts. In this paper, we investigated deformation property of tension-side open type 6063 aluminum alloy extruded sections in the rotary draw bending process. A6063S extruded sections having various thickness applied to the workpiece of this experiment. In the rotary draw bending process of these workpieces, undesirable phenomena such as flattening distortion, compression flange wrinkling and web wrinkling arise in the same way as square tube. Flattening distortion can be restrained principally by rigid mandrel and restriction guide for web displacement. Compression flange wrinkling can be restrained by additional axial tension. As a result of this study, it has been shown that applying these restriction tools and additional axial tension are very effective in preventing undesirable deformations. The bend degree H0/R0 reaches 0.24 without any defects in this bending process, the workpiece of A6063S–O with thickness ratio H0/t0 = 26.7.
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