Transactions of Materials and Heat Treatment

Title：Finite element analysis on twist defect in roll forming of asymmetric section

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ClassificationCode：TH16

year,vol(issue):pagenumber：2023,48(1):66-72

Abstract：

The vertical edge length of asymmetrical section is different, and twist defect is easy to occur during the roll forming process. Therefore, the roll forming of asymmetric section was studied by combining the experiment and finite element simulation, and a finite element simulation model of ultra-high-strength steel roll forming was established. Then, a method of reducing the twist defect of V-shaped asymmetric section by tilting front roller was proposed, and the calculation method of tilt angle for front roller was discussed. The results show that for the roll forming of V-shaped asymmetrical section , the tilting front roller changes the state of the sheet entering the roller, the tilt angle of front roller is φ = 8. 9°, the twist angle reduces by 40. 9%, the peak value of longitudinal strain in the deformation zone significantly reduces, and the strain amount decreases. In addition, the bending moment difference on both sides of vertical edges is an important factor causing twist defect, and the tilting front roller causes the magnitude and direction of the bending moment difference on both sides of vertical edges for sheet to change. The resultant bending moment changes from 0. 18 N·m to 17. 6 N·m, and the direction changes from turning to the short vertical edge to turning to the long vertical edge, thus suppressing the twist defect to a certain extent.

Funds：

北京市自然科学基金- 市教委联合资助项目(KZ201910009011); 北京市属高校高水平教师队伍建设长城学者培养计划(CIT&TCD20190306); 北京市教委基本科研业务费项目(110052972027/024); 北方工业大学毓杰团队支持计划(107051360021XN083/001); 国家自然科学基金资助项目(51074204)

作者简介: 李　冲(1988-), 男, 硕士 E-mail: lichong@ mail. ncut. edu. cn 通信作者: 韩　飞(1977-), 男, 博士, 教授 E-mail: hanfei@ ncut. edu. cn

Reference：

[1] 　韩飞, 刘继英, 艾正青, 等. 辊弯成型技术理论及应用研究现状[J]. 塑性工程学报, 2010, 17 (5): 71-78.

Han F, Liu J Y, Ai Z Q, et al. State of the art of research on roll forming process [J]. Journal of Plasticity Engineering, 2010, 17(5): 71-78.

[2] 　Halmos G T. 刘继英, 艾正青, 译. 冷弯成型技术手册[M].北京: 化学工业出版社, 2009.

Halmos G T. Translated by Liu J Y, Ai Z Q. Roll Forming Handbook [M]. Beijing: Chemical Industry Press, 2009.

[3] 　张乐乐, 谭南林, 张华弟, 等. 非对称断面型材成型有限条模拟与可视化研究[J]. 塑性工程学报, 2005, 12 (6): 30-33.

Zhang L L, Tan N L, Zhang H D, et al. Research on finite-strip simulation and visualization of profile forming with asymmetric section [J]. Journal of Plasticity Engineering, 2005, 12 (6): 30-33.

[4] 　小奈弘, 刘继英. 冷弯成型技术[M]. 北京: 化学工业出版社, 2008.

Hiroshi D, Liu J Y. Cold-Bending Technology [ M]. Beijing:Chemical Industry Press, 2008.

[5] 　Cha W G, Kim H L, Kim N S. A study on the development of dedicated fea tool for roll forming of asymmetrical U-channel [J]. Advanced Materials Research, 2012, 445: 73-78.

[6] 　Cha W G, Kim Naksoo. Study on twisting and bowing of roll formed products made of high strength steel [ J]. International Journal of Precision Engineering & Manufacturing, 2013, 16(9): 1527-1533.

[7] 　Kasaei M M, Naeini H M. 2019 Geometry effects of asymmetrical channel sections on common defects in the roll forming process [J]. Journal of Applied and Computational Mechanics, 2019, 30(2): 1-16.

[8] 　袁浩, 周学渊, 操文武, 等. 基于显式动力学非对称断面辊弯成形数值模拟及实验[ J]. 塑性工程学报, 2020, 27(10): 147-155.

Yuan H, Zhou X Y, Cao W W, et al. Numerical simulation and experiment of asymetric section roll forming based on explicit dynamics [J]. Journal of Plasticity Engineering, 2020, 27 (10):

147-155.

[9] 　钱志平, 林建凯, 聂凯锋, 等. 非对称截面型材平面拉弯成形时法向变形研究[J]. 塑性工程学报, 2020, 27 (7): 176-181.

Qian Z P, Lin J K, Nie K F, et al. Research on normal deformation in surface stretch bending process of dissymmetric section profile [J]. Journal of Plasticity Engineering, 2020, 27 (7): 176-

181.

[10] 郭湘宇, 周海燕. 不对称角钢辊压成形断面长短边弯曲角度的研究[J]. 锻压技术, 2021, 46 (10): 125-130.

Guo X Y, Zhou H Y. Study on bending angles of long and short sides in rolling section for asymmetric angle steel [J]. Forging & Stamping Technology, 2021, 46 (10): 125-130.

[11] Meng Z, Fang Y, Ma L. A method for rapid prediction of edge defects in cold roll forming process [ J]. Mathematics, 2021, 9(16): 1-11.

[12] Wang Y, Xu X, Liu H, et al. Optimization of the forming method on torsion defect in cold-roll forming of Z section steel [J]. ACS omega, 2022, 7 (6): 4804-4811.

[13] GB/ T 228. 1—2021, 金属材料　拉伸试验　第1 部分: 室温试验方法[S].

GB/ T 228. 1—2021, Metallic materials—Tensile testing—Part 1:Method of test at room temperature [S].

[14] Yaser T, Hassan M N, Roohollah A T, et al. A strategy to reduce the twist defect in roll-formed asymmetrical-channel sections [J].Thin-Walled Structures, 2018, 130: 395-404.

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