| 摘要 |
PROBLEM TO BE SOLVED: To provide an extrusion hollow section for bending for securing the flatness of a web surface after bending without causing distorting on the web surface. SOLUTION: The aluminum alloy extrusion hollow section 1 having an approximately rectangular cross section formed by flanges 4, 5 and webs 2, 3 perpendicular to each other is joined at its web surface 2a to another member after bending. The flange 4 to be a bent outside in the process of bending, out of the flanges, has a circular arc shape extending toward the bent outside.
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