Transactions of Materials and Heat Treatment

Title：A new method of thermal bending for aluminium alloy tubes with thermally expandable graphite as filler and feasibility study

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ClassificationCode：TG302

year,vol(issue):pagenumber：2025,50(8):107-112

Abstract：

Aiming at the quality defects of aluminum alloy tubes such as wrinkles, springback and cross-section distortion that often occur during the bending process, the method of thermal bending by filling thermally expandable graphite inside the tube was proposed, and its feasibility was verified by combining finite-element analysis and experiments. First, the thermal bending processes of 5052 aluminum alloy tubes filled with no filler, quartz sand and thermally expandable graphite, respectively were analyzed by ANSYS/Workbench finite element analysis software, and the changes of equivalent stress, center section ellipticity and springback amount of 5052 aluminum alloy bent specimens with different fillers and different heating temperatures were obtained. Furthermore, the relevant experiments were conducted to verify the results. The results show that,compared to filling with no filler and quartz inside the tube, using thermally expandable graphite as a filler is more conducive to improve the quality of aluminum alloy bent parts, which verifies the feasibility of the proposed method.

Funds：

辽宁省自然科学基金资助项目（2022-MS-295）

作者简介：高铁军（1977-），男，博士，教授 E-mail：tiejun_gao@163.com

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