摘要
针对大型运载火箭箭体短壳构件传统加工周期长、材料利用率低等问题,提出了通过旋挤成形加工带外筋筒形件的方法。基于数值仿真方法开展了2219铝合金带外筋筒形件在不同壁厚、筋条高宽比和筋条稀疏度下的旋挤成形材料流变分析。结果表明:随着筒坯壁厚的增大,材料流动集中在与旋轮接触表面,筋条填充度更高;筋条存在极限高宽比,超过极限宽度后筋条出现筋高分布不均、材料与约束套筒贴合度差等缺陷;筋条稀疏度越高,材料受到的等效应力越小,使得筋条的成形更为困难。通过旋挤设备进行试验,成形出了外筋筒形件,证明了采用旋挤方法成形外筋筒形件的可行性。
Aiming at the problems of long processing cycle and low material utilization of traditional manufacturing short shell parts of large launcher vehicle body,the spin extrusion forming method for manufacturing tubular part with external ribs was proposed.Based on numerical simulation method,the material flow analysis of 2219 aluminum alloy tubular part with external ribs with different wall thicknesses,rib height to rib width ratios and rib sparsity was carried out.The results show that with the increase of the wall thickness of tubular billet,the material flow is concentrated on the surface,which is contacting with the spining roller,and the filling degree of rib is higher;the rib has limited height to width ratio,and there are defects such as uneven distribution of rib height and poor fitting degree between material and restraint sleeve after exceeding the limited width;the higher the rib sparsity,the lower the effective stress on the material,and the formation of ribs is more difficult.Through the spin extrusion forming test,the tubular part with external ribs was formed,which proved the feasibility of forming tubular part with external ribs by spin extrusion forming method.
作者
陈星翰
于忠奇
赵亦希
CHEN Xing-han;YU Zhong-qi;ZHAO Yi-xi(Shanghai Key Laboratory of Digital Manufacture for Thin-Walled Structures,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2024年第11期39-45,共7页
Journal of Plasticity Engineering
基金
国家重点研发计划(2020YFA0711102)
国防基础科研项目(JCKY2022203C049)。
关键词
外筋筒体
旋挤成形
铝合金
数值仿真
tubular with external ribs
spin extrusion forming
aluminum alloy
numerical simulation
