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| 2219铝合金瓜瓣构件磁脉冲辅助冲压成形工艺研究 |
| Electromagnetic Assisted Stamping Process of 2219 Aluminum Alloy Melon Petal |
| Received:February 19, 2025 |
| DOI：10.3969/j.issn.1674-6457.2025.04.004 |
| 中文关键词: 电磁成形 磁脉冲辅助冲压成形 2219铝合金 数值模拟 等效应力 尺寸精度 |
| 英文关键词: electromagnetic forming electromagnetic assisted stamping 2219 aluminum alloy numerical simulation equivalent stress surface accuracy |
| 基金项目:国家重点研发计划(2023YFB3407000);国家自然科学基金区域创新发展联合基金(U24A20117) |
| Author Name | Affiliation | | ZHOU Wei | State Key Laboratory of Materials Processing and Die &
Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China | | HUANG Liang | State Key Laboratory of Materials Processing and Die &
Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China | | LIU Hao | State Key Laboratory of Materials Processing and Die &
Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China | | LI Junhui | State Key Laboratory of Materials Processing and Die &
Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China | | WANG Rui | State Key Laboratory of Materials Processing and Die &
Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China | | MAO Wenjie | State Key Laboratory of Materials Processing and Die &
Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China |
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| 中文摘要: |
| 目的 为进一步提升2219铝合金火箭贮箱箱底瓜瓣构件的尺寸精度，进行了瓜瓣构件磁脉冲辅助冲压成形工艺的研究。方法 设计磁脉冲辅助冲压成形工艺方案，基于LS-DYNA R8.0有限元软件，建立了2219铝合金瓜瓣构件磁脉冲辅助冲压成形有限元模型，并通过实验进行了有效验证。通过数值仿真模拟分析了板料成形过程及其成形效果，阐明了瓜瓣构件磁脉冲辅助冲压成形的变形行为。结果 板料冲压成形后的等效应力显著集中于圆角过渡区域，应力分布不均导致贴模性较差。引入电磁成形后，板料在瞬时交变脉冲电磁力的作用下具有显著的应力震荡效应，等效应力经高速震荡后可得到有效释放，在放电电压为10 kV条件下，平均应力从71.1 MPa下降至30.4 MPa，降低了57.2%。板料的贴模间距曲线幅值更均匀，平均贴模间距从0.91 mm降低至0.52 mm，随放电电压的不断提高，瓜瓣构件的平均贴模间距不断减小。结论 磁脉冲辅助冲压成形可有效改善瓜瓣构件的贴模性，经过放电电压12 kV以上的电磁成形后，板料的平均贴模间距在0.5 mm以下，降低了45%以上。 |
| 英文摘要: |
| The work aims to study the electromagnetic assisted stamping process of the 2219 aluminum alloy rocket tank bottom melon petal formed by the drawing process so as to solve the poor surface accuracy of the melon petal. An electromagnetic assisted stamping process scheme was designed. Based on the LS-DYNA R8.0 finite element software, a finite element model of the electromagnetic assisted stamping of the 2219 aluminum alloy melon petal was established and effectively verified by experiments. The forming process of blank and its forming effect were analyzed based on simulation. The deformation behavior of electromagnetic assisted stamping of the melon petal was explained. The results showed that the stress concentration of the sheet after stamping was prone to occur in the fillet transition area, and the uneven stress distribution resulted in poor conformity. After introducing electromagnetic forming, the sheet material exhibited significant stress oscillation effects under the action of instantaneous alternating pulse electromagnetic force. The equivalent stress was effectively released through high-speed oscillation. Under a discharge voltage of 10 kV, the average stress decreased from 71.1 MPa to 30.4 MPa, representing a reduction of 57.2%. The separation of curves for the sheet became more uniform, with the average separation decreasing from 0.91 mm to 0.52 mm. As the discharge voltage increased, the average separation of the melon petal continuously decreased. In conclusion, electromagnetic assisted stamping can effectively improve the conformity of the melon petal. After electromagnetic forming with a forming voltage of more than 12 kV, the average separation of the blank is less than 0.5 mm, which is reduced by more than 45%. |
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