优化无焊缝钛内衬内表面质量的旋压工艺

针对复合材料压力容器用无焊缝TA1钛内衬,利用收口旋压实验和有限元模拟分析研究了两种典型收口旋压旋轮轨迹(水平直线和斜线轨迹)对旋压封头内表面缺陷的影响。结果表明:较斜线旋压,水平旋压后内表面褶皱等缺陷明显减少,说明水平旋压是一种优化无焊缝钛封头内表面质量的有效方式。有限元模拟分析表明:较斜线旋压,水平旋压每道次内表面的等效应变增量分布更均匀,并且多道次旋压后内表面的累积等效应变更小,说明水平旋压具有更均匀的变形特点和更少的应变累积,是内表面具有较弱褶皱趋势的主要原因。

Investigation on Neck-Spinning for Improving Inner Surface Quality of Seamless Titanium Liner

The effects of two typical spinning techniques,i.e.the horizontal and diagonal feeding paths of the spinning roller,on the inner surface defects of its spun dome of TA1 seamless liner of composite overwrapped pressure vessels,are investigated by utilizing the neck-spinning experiments and finite element analysis, respectively.The experimental results indicate that a significant improvement in the inner surface finishing has been obtained by the horizontal paths,which is an effective way to reduce the inner surface defects for the seamless titanium liner.The finite element analysis reveals that the horizontal path is provided more homogeneous deformation with significantly less variation in strain gradient on the dome inner surface than the diagonal path,which is the critical factor for the horizontal path with an improved inner surface quality.