Cryogenic springback of 2219-W aluminum alloy sheet through V-shaped bending  

2219固溶态铝合金超低温V形弯曲回弹

作　　者：Xiao-bo FAN Qi-liang WANG Fang-xing WU Xu-gang WANG 凡晓波;王启梁;邬方兴;王旭刚(大连理工大学机械工程学院,大连116081;哈尔滨工业大学材料科学与工程学院,哈尔滨150096)

机构地区：[1]School of Mechanical Engineering,Dalian University of Technology,Dalian 116081,China [2]School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150096,China

出　　处：《Transactions of Nonferrous Metals Society of China》2024年第10期3185-3193,共9页中国有色金属学报（英文版）

基　　金：the financial supports from the National Key Research and Development Program of China (No. 2019YFA0708804)。

摘　　要：A V-shaped bending device was established to evaluate the effects of temperature and bending fillet radius on springback behavior of 2219-W aluminum alloy at cryogenic temperatures.The cryogenic springback mechanism was elucidated through mechanical analyses and numerical simulations.The results indicated that the springback angle at cryogenic temperatures was greater than that at room temperature.The springback angle increased further as the temperature returned to ambient conditions,attributed to the combined effects of the “dual enhancement effect” and thermal expansion.Notably,a critical fillet radius made the springback angle zero for 90° V-shaped bending.The critical fillet radius at cryogenic temperatures was smaller than that at room temperature,owing to the influence of temperature variations on the bending moment ratio between the forward bending section at the fillet and the reverse bending section of the straight arm.通过建立超低温V形压弯装置,确定温度和凸模半径对2219固溶态铝合金超低温回弹的影响,并进行力学分析和数值模拟揭示超低温回弹机制。结果表明,超低温回弹角略大于常温,在恢复至常温的过程中,回弹角进一步增大,这是由于“双增效应”和热膨胀的影响。90°V形弯曲存在一个回弹角为零的临界圆角半径,且超低温临界圆角半径小于常温,这是由于圆角弯曲段和直臂反弯曲段的正负弯矩比受到超低温耦合的影响。

关 键 词：2219-W aluminum alloy cryogenic forming V-shape bending SPRINGBACK critical fillet radius 

分 类 号：TG146.21[一般工业技术—材料科学与工程]