锻压技术

7075铝合金变截面曲率构件拉弯仿真及试验研究特种成形

英文标题：Simulation and experiment research on stretch bending of 7075 aluminum alloy curvature component with variable cross-section

作者：金妍1 杜建宁1 崔丽1 郭贵强2 王逸涵2 李小强2 李东升2

单位：1. 沈阳飞机工业（集团）有限公司 2. 北京航空航天大学机械工程及自动化学院

关键词：7075铝合金变截面曲率构件拉弯成形拉伸力回弹

分类号：TG306

出版年,卷(期):页码：2022,47(3):96-102

摘要：

针对某型飞机7075铝合金变截面曲率构件拉弯成形起皱明显、回弹严重、手工敲修量大、工艺周期长等问题，提出采用新淬火状态型材一次拉弯成形工艺方法，并将有限元仿真与工艺试验相结合，分析验证了拉伸力、坯料宽度、包覆角度等工艺参数对零件起皱、破裂、回弹的影响规律。结果表明：增大拉伸力可有效抑制型材内侧的起皱现象；合理减小坯料宽度可减小型材破裂的风险；增大包覆角度可减小零件的回弹量。最终，获得了优化的拉弯成形工艺参数，即拉伸力为42 kN、坯料初始宽度为130 mm、包覆角度为96°，利用该参数组合进行拉弯成形，零件未发生破裂，有效避免了内侧起皱现象，减小了零件的回弹量。

For the problems of obvious wrinkling, serious springback, large amount of manual knocking and repairing, and long process cycle in stretch bending of 7075 aluminum alloy curvature component with variable cross-section for a certain aircraft, a one-step stretch bending process method of the newly quenched profile was proposed, and through the combination of finite element simulation and process test, the influences laws of process parameters such as stretch force, profile width and wrapping angle on wrinkling, rupture and springback of part were analyzed and verified. The results show that increasing the tensile force can effectively inhibit wrinkling phenomenon inside the profile, reasonably reducing the profile width can reduce the risk of profile rupture, and increasing the wrapping angle can reduce the springback of part. The optimized stretch bending process parameters were obtained with the stretch force of 42 kN, initial profile width of 130 mm and the wrapping angle of 96°. Using this combination of parameters for stretch bending, the rupture of part does not occur, the wrinkling phenomenon inside the profile is effectively avoided, and the springback of part is reduced.

基金项目：

国家自然科学基金资助项目（52105317）

作者简介：金妍（1978-），女，学士，高级工程师 E-mail：584496540@qq.com 通信作者：郭贵强（1988-），男，博士，中级职称 E-mail：guoguiqiang@buaa.edu.cn

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