Bulging limit of AZ31B magnesium alloy tubes in hydroforming with internal and external pressure
Bulging limit of AZ31B magnesium alloy tubes in hydroforming with internal and external pressure
复制标题
AZ31B镁合金管材内外压内高压成形胀形极限
DOI：
10.1007/s00170-018-3076-5
复制
发表时间：
2019-04-01
影响因子：
3.4
通讯作者：
He, Hailin
中科院分区：
文献类型：
--
作者：
Mao, Xianchang;Yi, Youping;He, Hailin
采用有限元软件Dynaform，考虑塑性理论和屈服准则，对AZ31B镁合金管材内、外压液压胀形过程进行了数值模拟。重点研究了工艺参数（刀具圆角半径r、锥形芯锥角φ、胀形区长度l、管材轴向补缩量s、内压Pi和外压Po）对最大胀形直径dmax的影响。结果表明，当r小于3 mm时，dmax随r的增大而显著增大，当r大于3 mm时，dmax随r的增大而保持稳定。φ、l、s、Pi和Pon对dmax的影响相似，dmax随这些参数的增大先增大后减小。确定了最佳胀形工艺参数：r = 5 mm，φ = 12°，s = 10 mm，l = 37.5 mm，Pi = 34 MPa，Po = 17 MPa，最大直径d = 40.43 mm。
The bulging process of AZ31B magnesium alloy tubes in hydroforming with internal and external pressure (THFIEP) was simulated using the commercial finite element software Dynaform and considering plasticity theory and the yield criterion. The investigations focused on the influence of the processing parameters (the corner radius of the tool (r), the taper angle of the conical core (φ), the length of the bulging zone (l), the axial supplement of the tubes (s), the internal pressure (Pi), and the external pressure (Po)) on the maximum bulging diameter (dmax). The results showed that thedmaxincreased significantly with increasingrwhenrwas less than 3 mm, anddmaxremained stable with increasingrwhenrwas larger than 3 mm. The influences ofφ,l,s,Pi, andPoon thedmaxwere similar; thedmaxfirst increased then decreased with increasing values of these parameters. The optimum bulging processing parameters were determined,rwas 5 mm,φwas 12°,swas 10 mm,lwas 37.5 mm,Piwas 34 MPa,Powas 17 MPa, and the obtained optimumdmaxwas 40.43 mm.