Transactions of Materials and Heat Treatment

Title：Control on section distortion for U-shaped 7A09 aluminum profiles in stretch-bending

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ClassificationCode：TH162

year,vol(issue):pagenumber：2022,47(1):119-123

Abstract：

The problem of section distortion is prone to occur during the stretch-bending process of hollow profiles. Therefore, for a U-shaped aluminum profile of a launch vehicle, the influences of two different fillers and the gap between filler and profile on the section distortion of part were compared and analyzed by combining the numerical simulation of stretch-bending and the test of stretch-bending. The simulation analysis results show that when the process parameters are the same, the use of PVC filler can suppress the defects well such as the inclination and depression of outer vertical edge, and the larger the gap between filler and profile is, the greater the inclination angle gap of outer vertical edge is, but the depression depth of outer vertical edge is less affected by the gap between filler and profile. Based on the simulation results, the stretch-bending test

was carried out under the condition that the gap between filler and profile was ≤0.5 mm with PVC filler, and the measured inclination angle gap of outer vertical edge for the part after forming was less than 0.5 mm and the measured depression depth was less than 0.3 mm, which met the design requirements.

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作者简介：王妍琴（1987-），女，硕士，工程师 E-mail：1124337718@qq.com

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