Transactions of Materials and Heat Treatment

Title：Action effects of mandrel on numerical control bending of tube with small bending radius

Authors： Shang Wenxuan1 Xiang Junhuai1 Fang Jun2 Wan Tao2 Li Minchun1 Wang Kelu3 Lu Shiqiang3

Unit： 1. School of Materials and Energy Jiangxi Science and Technology Normal University 2. School of Information and Mechatronics Engineering Jiangxi Science and Technology Normal University 3. School of Aeronautical Manufacturing Engineering Nanchang Hangkong University

KeyWords： 21-6-9 high strength stainless steel tube small bending radius mandrel type mandrel extension amount mandrel diameter

ClassificationCode：TG386

year,vol(issue):pagenumber：2024,49(11):37-46

Abstract：

In order to reveal the action effect of mandrel on numerical control(NC) bending tube with small bending radius, according to the geometric position relationship between dies and tube in the NC bending process of tube, the analytical models of mandrel extension amount and mandrel diameter were deduced, the finite element (FE) model of NC bending for 21-6-9 high strength stainless steel tube with small bending radius was built, and the reliability of the model was verified by experiment. Then, the influences of mandrel types, mandrel extension amount and mandrel diameter on tangential stress/strain distribution, wall thickness thickening, wall thickness thinning and cross-section distortion of high strength stainless steel tube with small bending radius in NC bending were analyzed by using the FE model. The results show that the hemispherical mandrel can obtain the best forming performance. With the increasing of mandrel extension amount and mandrel diameter, the wall thickness thinning rate increases and the cross-section distortion rate decreases, while the wall thickness thickening rate does not change significantly. In addition, the ranges of suitable mandrel extension amount and mandrel diameter are 0.5-1.5 mm and Φ5.23-Φ5.43 mm, respectively.

Funds：

江西省自然科学基金资助项目（20192BAB216022）；江西省教育厅科学技术研究项目（GJJ201126）

作者简介：尚文瑄（1999-），女，硕士研究生 E-mail：1344871703@qq.com 通信作者：方军（1984-），男，博士，副教授 E-mail：fangjun020j13@163.com

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