π截面铝合金型材拉弯成形工艺数值模拟研究
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摘要
针对A7075-T6型材结构件,利用ABAQUS软件建立π型截面型材拉弯成形有限元模型,对该铝合金型材结构件拉弯成形进行数值模拟,并分析预拉量、补拉量、弯曲半径及摩擦系数的变化对回弹的影响。结果表明:预拉量、补拉量、弯曲半径和摩系数都会影响回弹量,在相对应的变化范围内,回弹随着预拉量、补拉量的增大有明显减小的趋势,而回弹量与弯曲半径和摩擦系数均呈正相关。其中对回弹量的变化影响较为明显的为拉伸量;当预拉量为1%,补拉量为2%,摩擦系数为0. 08,弯曲半径为200 mm时,回弹最小。
Taking A7075-T6 profile structural part as the research object,ABAQUS was used to establish the finite element model of stretch-bending process for π-section aluminum alloy profiles. The stretch-bending process was numerically simulated and the influence of the variation of pre-pulling amount, post-pulling amount, bending radius and friction coefficient on the curvature springback was analyzed. The results show that pre-pulling amount,post-pulling amount,bending radius and friction coefficient have affection on the springback amount. Within the corresponding range of variation,the springback has a significant tendency to decrease with the increase of the pre-pulling or the post-pulling amount,and the springback amount is positively correlated with the bending radius and the friction coefficient. The influence of tensile pulling amount on springback is more obvious. When the pre-pulling amount is 1 %,the post-pulling amount is 2 %,the friction coefficient is 0. 08,and the bending radius is 200 mm,the springback is the minimum.
Taking A7075-T6 profile structural part as the research object,ABAQUS was used to establish the finite element model of stretch-bending process for π-section aluminum alloy profiles. The stretch-bending process was numerically simulated and the influence of the variation of pre-pulling amount, post-pulling amount, bending radius and friction coefficient on the curvature springback was analyzed. The results show that pre-pulling amount,post-pulling amount,bending radius and friction coefficient have affection on the springback amount. Within the corresponding range of variation,the springback has a significant tendency to decrease with the increase of the pre-pulling or the post-pulling amount,and the springback amount is positively correlated with the bending radius and the friction coefficient. The influence of tensile pulling amount on springback is more obvious. When the pre-pulling amount is 1 %,the post-pulling amount is 2 %,the friction coefficient is 0. 08,and the bending radius is 200 mm,the springback is the minimum.
引文
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[2]郝涛涛,陈明和,李淑兰,等.非对称截面型材拉弯成形数值模拟研究[J].机械制造,2014,52(6):40-42.
[3]梁继业,邓刚,方斌. L型截面铝型材拉弯成形截面畸变缺陷控制研究[J].锻压技术,2016,41(12):42-45.LIANG Jiye,DENG Gang,FANG Bin. Section distortion control for L-section aluminum profile part in the stretch-bending process[J]. Forging&Stamping Technology,2016,41(12):42-45.
[4]杜建宁,李小强,高岩.典型铝合金型材零件拉弯成形工艺的数值模拟与实验研究[J].锻压技术,2015,40(4):148-151.DU Jianning,LI Xiaoqiang,GAO Yan. Numerical simulation and experimental research of stretch-bending process for typical aluminum alloy parts[J]. Forging&Stamping Technology,2015,40(4):48-151.
[5]翟瑞雪,赵军,马瑞,等.矩形截面型材平面拉弯弹复解析和实验验证[J].机械工程学报,2014,50(18):82-91.ZHAI Ruixue,ZHAO Jun,MA Rui,et al. Spring-back analysis of plane stretch-bending for profile with rectangular cross-section and experimental verification[J]. Journal of Mechanical Engineering,2014,50(18):82-91.
[6]周贤宾,刁可山,李晓星,等.闭截面型材的拉弯成形性[J].北京航空航天大学学报,2006,32(10):1168-1173.ZHOU Xianbin,DIAO Keshan,LI Xiaoxing,et al. Stretch bending formability of profile[J]. Journal of Beijing University of Aeronautics and Astronatutics,2006,32(10):1168-1173.
[7]谢峰,刘正士.金属切削过程的有限元建模[J].合肥工业大学学报(自然科学版),2004,27(5):463-467.XIE Feng,LIU Zhengshi. Finite element modeling of the metalcutting process[J]. Journal of Hefei University of Technology(Natural Science),2004,27(5):463-467.