反胀压力对铝合金球底筒形件充液拉深过程的影响  

The influence of inverse bulging pressure on the hydrodynamic deep drawing process of Aluminium alloy cylindrical cups with a hemispherical bottom

作　　者：刘晓晶[1] 徐永超[1] 苑世剑[1] 

机构地区：[1]哈尔滨工业大学材料科学与工程学院

出　　处：《塑性工程学报》2008年第3期42-46,共5页Journal of Plasticity Engineering

基　　金：国家杰出青年基金资助项目(50525516)

摘　　要：充液拉深工艺是一种先进的板材柔性成形方法。结合航天部件的实际需求,通过数值模拟的方法,对5A06铝合金球底筒形零件的初始反胀充液拉深成形过程进行了研究。应用基于LS-DYNA3D内核的动力显示分析软件eta/Dynaform5.5,分析了液室初始反胀压力与液室压力对零件壁厚分布以及起皱、拉裂等缺陷的影响规律,讨论了反胀压力与液室压力的匹配关系,得到了合理的加载区间。结果表明,采用优化的初始反胀压力和液室压力耦合加载条件,可以有效的抑制零件球底部的过度减薄,控制悬空区的内皱,提高零件成形质量。Hydrodynamic deep drawing （HDD） is a kind of advanced flexible sheet metal forming method. Satisfying the need of aerospace parts and aiming at 5A06 aluminum alloy cylindrical cup with a hemispherical bottom, HDD with initial inverse bulging pressure was studied by means of numerical simulation. The dynamic explicit analytical software eta/Dynaform was employed which was based on LS-DYNA3D. The influence of initial inverse bulging pressure in chamber on the deep drawing process was researched. The effects of initial inverse bulging pressure and chamber pressure on the sheet-thickness distribution, wrinkling and fracture were analyzed. The reasonable loading range was obtained by discussing the matching relation between the initial inverse bulging pressure and chamber pressure. The results indicated that at the optimized matching loading condition of the initial inverse bulging pressure and the chamber pressure, the thickness thinning was restrained effectually, the inner wrinkling of the free area could be controlled and the quality of the parts could be improved.

关 键 词：充液拉深 数值模拟 反胀压力 

分 类 号：TG386[金属学及工艺—金属压力加工]