锻压技术

2219铝合金曲面件局部热翻边成形性能

英文标题：Formability of 2219 aluminum alloy curved components in local warm flanging

分类号：TG386

出版年,卷(期):页码：2023,48(5):39-43

摘要：

针对超低温成形整体箱底局部翻边成形时易开裂的难题，提出时效温度热翻边成形工艺路线。采用单向拉伸试验测试了超低温预变形后2219铝合金的热态力学性能；通过工艺试验和数值模拟阐明了时效温度热翻边成形规律。研究发现：超低温预变形试件在时效温度下的伸长率显著增加，由常温时的19.5%提高至31.3%；在时效温度下，实现了直径为Φ100 mm的孔的翻边,平均翻边高度为7.5 mm；从圆角到直壁截面壁厚逐渐减小，最大减薄率为18.4%。研究成果成功应用于超低温成形的2 m级火箭整体箱底的局部翻边成形，为整体结构局部特征成形提供了技术支撑和指导。

For the problem of easy cracking when local flanging of integral box bottom formed at ultra-low temperature, a process route of warm flanging at aging temperature was proposed, and the thermal mechanical properties of 2219 aluminum alloy after ultra-low temperature pre-deformation were tested by uniaxial tensile test. Furthermore, the forming law of warn flanging at aging temperature was elucidated by process tests and numerical simulations. The research find that the elongation of ultra-low temperature pre-deformed specimens significantly increase at aging temperature, from 19.5% at room temperature to 31.3%. At aging temperature, the flanging of holes with a diameter of Φ100 mm is realized, and the average flanging height is 7.5 mm. The wall thickness of section gradually decreases from the rounded corner to the straight walls, and the maximum thinning rate is 18.4%. Thus, the research results have been successfully applied to the ultra-low temperature forming of local flanging for the overall box bottom of 2 m-class rocket, providing technical support and guidance for the local feature forming of integral structure.

基金项目：

国家重点研发计划项目(2019YFA0708804)

作者简介：陈军龙（1996-），男，硕士研究生，E-mail：Chen_jl0822@163.com；通信作者：凡晓波（1987-），男，博士，副研究员，E-mail：xbfan@dlut.edu.cn

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