锻压技术

拉形轨迹对铝合金贮箱箱底瓜瓣拉形成形的影响

英文标题：Influence of stretch forming trajectory on stretch forming of melon shaped bottom for aluminum alloy tank

单位：1.天津航天长征火箭制造有限公司 2.首都航天机械有限公司 3.北京航空航天大学机械工程及自动化学院

分类号：TG316

出版年,卷(期):页码：2019,44(10):29-34

摘要：

利用ABAQUS有限元分析软件，分析了3种典型的拉形成形轨迹对铝合金贮箱箱底瓜瓣拉形成形的影响，并进行了试验验证。结果表明：采用先包覆再拉伸的拉形轨迹，成形力不能有效地传递到成形区域而集中在模具的圆角处，圆角处的壁厚为6.7 mm，其余部位壁厚基本保持不变，为6.9~7.0 mm，零件的应变分布不均匀，成形效果较差；采用先拉伸再包覆的拉形轨迹，零件产生较大的变形，成形过程中在过渡圆角处有断裂的危险，最小壁厚达到了6.2 mm，减薄率为11.5%；采用边包覆边拉伸的拉形轨迹，零件的应变分布变化趋势较为平缓，壁厚分布也较均匀，零件壁厚为6.6~6.8 mm。

The influences of three typical stretch forming trajectories on stretch forming of melon shaped bottom for aluminum alloy tank were analyzed by the finite element analysis software ABAQUS, and the experiment verification was carried out. The results show that through the stretch forming trajectory of first covering and then stretching, the forming force cannot be effectively transferred to the forming area and concentrated in the fillet of die, the wall thickness at fillet is 6.7 mm, and the wall thicknesses of the rest areas remain unchanged, which is 6.9-7.0 mm. Therefore, the strain distribution of part is not uniform, and the forming results is poor. However, the stretch forming trajectory of first stretching and then covering is used, the part produces large deformation, and the transition fillet has the risk of fracture in forming process, namely, the minimum wall thickness is 6.2 mm and the thinning rate is 11.5%. Furthermore, by the stretch forming trajectory of covering and stretching at the same time, the variation trend of strain distribution for part is relatively smooth, the wall thickness distribution is more uniform, and the wall thickness of part is 6.6-6.8 mm.

基金项目：

天津市科技支撑项目（17YFZCGX00530）

作者简介：张杰刚(1980-)，男，硕士，高级工程师 E-mail：zhangjg_0532@163.com 通讯作者：李继光（1981-），男，博士，高级工程师 E-mail：jiguangli2008@126.com

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