锻压技术

高强钢辊弯成形中预冲孔尺寸及位置对回弹的影响

英文标题：Influence of size and position of pre-punched hole on springback in roll bending for high-strength steel

作者：刘志民张攀刘晓立张明

分类号：TG335

出版年,卷(期):页码：2021,46(12):133-140

摘要：

为分析高强钢辊弯成形中预冲孔对回弹的影响，对DP980高强钢进行单轴拉伸和循环加载-卸载试验，依据试验得出的材料力学性能参数得到变弹性模量数学模型，构建无孔U形件模型，并通过连续辊弯成形试验对其精度进行验证。设计了预冲孔尺寸和位置不同的两组成形方案，并运用有限元软件MSC MARC进行有限元仿真分析。结果表明：腹板上的预冲孔对回弹几乎不产生影响，立边上的预冲孔会对回弹产生一定影响；预冲孔横向尺寸变化侧重于对回弹角度的影响，纵向尺寸变化侧重于对发生回弹变化范围的影响。合理设计预冲孔尺寸及位置能够有效地降低预冲孔对回弹的影响，提高高强钢板带在辊弯成形中的成形精度。

In order to analyze the influence of pre-punched hole on springback in roll bending of high strength steel, the uniaxial tensile and cyclic loading-unloading tests were carried out on DP980 high-strength steel, and a variable elastic modulus mathematical model was obtained according to the mechanical property parameters obtained from the tests. Then, the model of U-shaped part without holes was constructed, and its precision was verified by continuous roll bending test. Furthermore, two kinds of forming schemes with different sizes and positions of pre-punched hole were designed, and the finite element simulation analysis was conducted by finite element software MSC MARC. The results show that the pre-punched hole on the web has little effect on the springback, while the pre-punched hole on the vertical side has a certain effect on the springback. The change in the transverse sizes of the pre-punched hole focuses on the impact of the sringback angle, and the change in the longitudinal sizes focuses on the impact of the change range of the springback. Thus, the reasonable design of the size and position of the pre-punched hole can effectively reduce the impact of the pre-punched hole on the springback and improve the forming accuracy of the high-strength steel strip in the roll bending.

基金项目：

国家自然科学基金青年基金资助项目（52005148）；邯郸市科学技术研究与发展计划项目（19422111008-21）

刘志民（1975-），男，博士，副教授 E-mail：liuzhiminhd@126.com 通信作者：刘晓立（1986-），男，博士，讲师 E-mail：liuxiaoli01206332@163.com

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