摘要
针对T型管内高压成形时支管高度有限和支管顶部壁厚过度减薄的问题,以规格为240 mm×Φ50 mm×1.25 mm的不锈钢管为研究对象,以总轴向进给量和最大内压力为约束,开展了有限元模拟与试验研究,获得轴向进给量和内压力的加载方式以及润滑方式对T型管支管成形高度和最大壁厚减薄率的影响规律。结果表明:当内压力为60 MPa,轴向进给量为50 mm时,内压采用先快后慢的加载方式,轴向进给量采用先慢后快的加载方式可获得成形高度和减薄率较为理想的T型管;差异化润滑可有效改善过渡圆角处材料堆积现象,有利于提高支管成形高度,降低支管顶部壁厚减薄率。
For the problems of limited height of the branch tube and excessive thinning of the wall thickness at the top of branch tube during in-ternal high-pressure forming of T-shape tube,taking the stainless steel tube with specifications of 240 mm×Φ50 mm×1.25 mm as the research object,and the total axial feed and the maximum internal pressure as the constraints,the finite element simulation and experimental research were carried out,and the influence laws of the axial feed and the loading mode of the internal pressure as well as lubrication mode on the form-ing height of the T-shape tube branch tube and the maximum wall thickness thinning rate of the wall thickness were obtained.The results show that when the internal pressure is 60 MPa and the axial feed is 50 mm,the internal pressure adopts the first fast and then slow pressurising meth-od,and the axial feed adopts the first slow and then fast feeding method,the T-shape tube with ideal forming height and thinning rate can be ob-tained.The differentiatial lubrication can effectively improve the material accumulation phenomenon at the transition fillet,which is conducive to improving the forming height of the branch tube and decreasing the thinning rate of wall thickness at the top of the branch tube.
作者
李小曼
钟李欣
章文亮
徐雪峰
李艳芳
谢君
LI Xiao-man;ZHONG Li-xin;ZHANG Wen-liang;XU Xue-feng;LI Yan-fang;XIE Jun(AVIC Xi′an Aircraft Industry Group Company Ltd.,Xi′an 710089,China;School of Aviation Manufacturing Engineering,Nanchang Hangkong University,Nanchang 330063,China;National Demonstration Center for Experimental Engineering Training Education,Nanchang Hangkong University,Nanchang 330063,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2024年第12期34-43,共10页
Journal of Plasticity Engineering
关键词
T形管
成形质量
加载方式
差异化润滑
T-shape tube
forming quality
loading method
differential lubrication
