Transactions of Materials and Heat Treatment

Title：Study on thickening limit and instability for aluminum alloy tube sidewall

Authors： Lin Qiquan Huang Silong Dong Wenzheng Li Yantao

Unit：

KeyWords：

ClassificationCode：TG376.9

year,vol(issue):pagenumber：2021,46(9):169-176

Abstract：

Thin-walled tubes is prone to bulge outward and fold when they are thickened,so the wrinkling and instability are the main forming defects. Therefore, the internal and external thickening processes of sidewall was presented, the inner (outer) surface of tube was restricted by the die so that the sidewall was thickened outward (inward). Through a combination method of finite element numerical simulation and experiment, the forming stabilities of the two processes were compared and analyzed to explore the reasons of instability phenomenon when the sidewall was thickened, and the laws of the sidewall thickening and the forming limit for the two kinds of thickening forming processes were studied. The results show that the forming stability is greatly improved when the sidewall is thickened inward compared with the external thickening and the traditional upsetting process. And by tracing the thickening process, it is found that the instability phenomenon of sidewall is related to the thickening direction and the axial stress distribution of sidewall. Furthermore, through finite element numerical simulation and theoretical analysis, the condition without instability for the internal thickening of sidewall is obtained, and the thickening limit of the internal thickening is less affected by the height, but is greatly affected by the height-to-diameter ratio.

Funds：

国家自然科学基金资助项目（51605408, 51575467）；湖南省自然科学基金资助项目（2019JJ50604, 2020JJ4578）

林启权（1964-），男，博士，教授 E-mail：xtulqq@163.com 通信作者：董文正（1986-），男，博士，副教授 E-mail：wzdong@xtu.edu.cn

Reference：

[1]王志剛. 板鍛造の技術要点[J]. 精密工学会誌，2014，80(12)：1049-1052.

Wang Z G. Keypoints of plate forging[J]. Journal of the Japan Society for Precision Engineering, 2014, 80(12): 1049-1052.

[2]杨勇，徐超，曹乃强，等. 空心管锻件精密辊锻成形工艺数值模拟[J]. 锻压技术，2020，45(8)：88-93.

Yang Y, Xu C, Cao N Q, et al. Numerical simulation of precision roll forging process for hollow tube forgings[J]. Forging & Stamping Technology, 2020, 45(8): 88-93.

[3]Zhu Y, Zhu S F, Zhuang X Z, et al. Die structure optimization for eliminating premature folding of sid-ewall upsetting with a controllable deformation zone[J]. The International Journal of Advanced Manufacturing Technology, 2019, 105(1-4): 1411-1424.

[4]Zhu S F, Zhuang X Z, Zhu Y, et al. Thickening of cup sidewall through sheet-bulk forming with controllable deformation zone[J]. Journal of Materials Processing Technology, 2018, 262: 597-604.

[5]Zhu S F, Zhuang X Z, Xu D K, et al. Flange forming at an arbitrary tube location through upsetting with a controllable deformation zone[J]. Journal of Materials Processing Technology, 2019, 273: 116230.

[6]Hsu C C, Wu W L, Su H Z, et al. Sheet-bulk metal forming of copper heat spreader with controllable deformation zone[J]. Journal of Materials Research and Technology, 2021, 12: 316-332.

[7]Schneider T, Merklein M. Manufacturing of geared sheet metal components by a single-stage sheet-bulk metal forming process[J]. Key Engineering Materials, 2013，554-557, 1478-1483.

[8]Alves L M, Gameiro J, Silva C M A, et al. Sheet-bulk forming of tubes for joining applications[J]. Journal of Materials Processing Technology, 2017, 240: 154-161.

[9]Alves L M, Afonso R M, Silva C M A, et al. Boss forming of annular flanges in thin-walled tubes[J]. Journal of Materials Processing Technology, 2017, 250: 182-189.

[10]Wang Z G, Hirasawa K, Yoshikawa Y, et al. Forming of light-weight gear wheel by plate forging[J]. CIRP Annals-Manufacturing Technology, 2017, 65(1): 293-296.

[11]Wang X Y, Guo M L, Luo J C, et al. Stamping-forging hybrid forming of double layer cup with different wall thicknesses[J]. Materials Research Innovations, 2011, 15 (1): 435-438.

[12]王新云，夏巨谌，陈志明，等. 板冲锻成形新工艺及其在轿车飞轮盘加工中的应用[J]. 塑性工程学报，2008，15(4)：180-184.

Wang X Y, Xia J C, Chen Z M, et al. Application of a new sheet stampting-forging hybrid technology in the forming of flying wheel panel of car[J]. Journal of Plasticity Engineering, 2008, 15(4):180-184.

[13]冯文杰，刘吉，陈莹莹，等. 内斜齿轮冷挤压成形工艺方案[J]. 锻压技术，2019，44(4)：95-100.

Feng W J, Liu J, Chen Y Y, et al. Cold extrusion forming process of internal helical gear[J]. Forging & Stamping Technology, 2019, 44(4): 95-100.

[14]Schuler GmbH. Metal Forming Handbook[M]. Berlin Heidelberg: Springer, 1998.

Service：

【This site has not yet opened Download Service】【Add Favorite】