锻压技术

芯模对小弯曲半径管材数控弯曲成形的作用效应

英文标题：Action effects of mandrel on numerical control bending of tube with small bending radius

单位：1. 江西科技师范大学材料与能源学院 2. 江西科技师范大学信息与机电工程学院江西南昌 330038 3. 南昌航空大学航空制造工程学院

分类号：TG386

出版年,卷(期):页码：2024,49(11):37-46

摘要：

为了揭示芯模对小弯曲半径管材数控弯曲成形的作用效应，根据管材数控弯曲成形过程中模具与管材之间的几何位置关系，推导出了芯模伸出量和芯模直径的解析模型，建立了小弯曲半径高锰高氧奥氏体不锈钢管数控弯曲成形有限元模型，并通过实验验证了模型的可靠性；然后，利用所建立的有限元模型模拟分析了芯模类型、芯模伸出量及芯模直径对小弯曲半径高强不锈钢管数控弯曲成形切向应力应变分布、壁厚增厚、壁厚减薄和截面畸变的影响。结果表明：半球式芯模可以获得最佳的成形性能；随着芯模伸出量、芯模直径的增加，壁厚减薄率增加，截面畸变率减小，而壁厚增厚率变化不明显；获得了合适的芯模伸出量和芯模直径，范围分别为0.5~1.5 mm和Φ5.23~Φ5.43 mm。

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.

基金项目：

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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