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Abstract：
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The innovative technology of hydroforming for integrated thin-walled curved parts with large size was proposed, and the theoretical model of hydroforming was built for thin-walled curved parts. Then, the influence laws of material and geometrical parameters on the fluid pressure were analyzed, and the influence laws of the ratio of thickness to diameter and the fluid pressure on the critical wrinkle stress were obtained by using energy method to analyze the critical winkle stress. Furthermore, the process window of hydroforming was built by experiments to verify the correctness of critical fluid pressure prediction, and the influences of loading paths on the shape and stress of reverse bulging region were analyzed by simulating the hydroforming process of thin-walled curved part with 3 m in diameter to obtain the optimal fluid pressure. Finally, the CNC hydroforming machine was developed with the maximum drawing force of 150 MN and the liquid volume of 5 m3, which was the biggest one in the world. Thus, the research on hydroforming process was conducted for large thin-walled curved part of aluminum alloy with the ratio of thickness to diameter lower than 2‰, and an integral thin-walled curved part with 3 m in diameter was directly formed for the first time in the world by the aluminum alloy plate with the thickness as same as the final component.
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Funds：
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国家重点研发计划（2017YFB0306304）；国家自然科学基金重点项目（U1637209）
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AuthorIntro：
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刘伟（1977-），男，博士，教授，E-mail：liuw@hit.edu.cn
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Reference：
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