摘要
针对薄壁管材弯曲成形中出现外壁拉裂、内壁起皱及截面畸变等成形缺陷,借助有限元数值模拟,研究了不同内胀压力下的成形效果和相同内压、不同相对壁厚对成形的影响规律。并在使用聚氨酯填料作为传力介质的条件下,采用内胀冷推弯工艺方法成形规格为Ф50mm×1mm和Ф50mm×1.5mm的LF2M薄壁管材。结果表明:内压的增加能有效消除截面畸变缺陷,同时外侧壁厚减薄趋势增大;相对壁厚增加,则壁厚减薄降低,截面畸变趋势增加,所需成形内压更大。对薄壁铝合金管材进行弯曲成形试验,实际成形效果与模拟结果较为吻合。
In view of the forming defects of external wall tensile cracks,internal wall wrinkling and cross-section distortion during bending process of thin-walled tubes,the forming effect under different internal pressures and the influence of different relative wall thicknesses on forming under the same internal pressure were studied by means of finite element numerical simulation. And with the use of polyurethane filler as force transmission medium,LF2 M thin-walled tubes of Φ50 mm × 1 mm and Φ50 mm × 1. 5 mm were formed through the internal expansion cold push bending process. The results show that increasing the internal pressure can effectively eliminate the cross-section distortion,and the thickness thinning tendency on the external wall increases. In addition,the thickness thinning decreases with the increase of relative thickness,the tendency of cross-section distortion increases,and greater internal pressure is required for forming. The bending test of thin-walled aluminum alloy tube was carried out,actual forming results were consistent with the simulation results.
作者
徐雪峰
邱泽宇
华如雨
肖尧
熊光利
杨萍川
XU Xue-feng;QIU Ze-yu;HUA Ru-yu;XIAO Yao;XIONG Guang-li;YANG Ping-chuan(School of Aviation Manufacturing Engineering,Nanchang Hangkong University,Nanchang 330063,China;AVIC Hongdu Aviation Industry Group,Nanchang 330024,China;AVIC Chengdu Aircraft Industrial (Group)Co.,Ltd.,Chengdu 610092,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2018年第6期77-84,共8页
Journal of Plasticity Engineering
基金
江西省重点研发计划资助项目(20165ABC28002)
关键词
薄壁管材
弯曲成形
数值模拟
截面畸变
壁厚减薄
thin-walled tube
bending forming
numerical simulation
cross-section distortion
thickness thinning
