Hydraulic bulging process with axial feedings and strain field of U-shaped metal bellows  

U型波纹金属软管推进式液压胀形工艺及应变场分析（英文）

作　　者：HAO Zeng-liang XI Chen-yang HUANG Zhi-heng ZHANG Chun-xiang LUO Jun-ting 郝增亮;郗晨阳;黄志恒;张春祥;骆俊廷(Education Ministry Key Laboratory of Advanced Forging & Stamping Technology and Science, Yanshan University;State Key Laboratory of Metastable Materials Science and Technology, Yanshan University)

机构地区：[1]Education Ministry Key Laboratory of Advanced Forging&Stamping Technology and Science,Yanshan University,Qinhuangdao 066004,China [2]State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004,China

出　　处：《Journal of Central South University》2018年第11期2712-2721,共10页中南大学学报（英文版）

基　　金：Project (51775479) supported by the National Natural Science Foundation of China;Project (E2017203046) supported by the Natural Science Foundation of Hebei Province,China

摘　　要：Based on the traditional hydraulic bulging process,an improved hydraulic bulging process with axial feeding in the bulging process was proposed.The finite element simulation and experiment of bellows formed by the traditional and improved hydraulic bulging processes were conducted.The grid strain measurement system analysis results of strain and wall thickness distribution of the metal bellows,obtained from simulation and experiment,show that the maximum thinning rates of the wall thickness under the traditional and improved processes were 15%and 10%,respectively.And the wall thickness distribution of the metal bellows formed with improved process was more uniform.The strain values from the root to crown of the waveform increased gradually.However,the strain values were smaller than those of traditional process due to the axial feeding of the improved process in bulging process.基于传统液压胀形工艺,提出在胀形阶段对坯料轴向进给的推进式液压胀形新工艺。对波纹金属软管推进式液压胀形新工艺和传统液压胀形工艺进行有限元模拟和实验研究,并通过网格应变测量法分析波纹金属软管的应变和壁厚减薄率。模拟和实验结果表明:传统液压胀形工艺和推进式液压胀形新工艺的最大壁厚减薄率分别是15%和10%,且推进式液压胀形工艺的壁厚分布更均匀;两种工艺下的应变均从波谷中心区到波峰中心区逐渐增大,但推进式液压胀形新工艺由于在胀形阶段的轴向进给,减小了波纹金属软管成形各区的应变值。

关 键 词：hydraulic bulging process finite element simulation thinning rate of wall thickness grid strain measurement system 

分 类 号：TG394[金属学及工艺—金属压力加工]