A new flexible multi-point incremental sheet forming process with multi-layer sheets
A new flexible multi-point incremental sheet forming process with multi-layer sheets
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DOI：
10.1016/j.jmatprotec.2023.118214
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发表时间：
2023-12
影响因子：
6.3
通讯作者：
Xuelei Zhao;Hengan Ou
中科院分区：
文献类型：
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作者：
Xuelei Zhao;Hengan Ou
提出了一种多层板料柔性多点渐进成形新工艺（F-MPIF-MLS）。这种新的成形工艺的新奇通过两个具体方面的贡献来证明。首先是开发一种新的柔性多点模具系统来取代传统的多点模具，其中多点销从成形操作的开始到结束都与坯料板接触并为坯料板提供支撑。第二种是使用多层片材，这允许目标坯料片材在没有夹紧约束的情况下变形。新的F-MPIF-MLS工艺清楚地显示了克服现有传统多点渐进板成形（MPIF）工艺的过度板变薄和差的表面光洁度的局限性的益处。通过实验测试和有限元（FE）模拟，对新的F-MPIF-MLS和传统的MPIF工艺进行了详细的比较研究。结果表明，使用新的柔性多点模具比传统的多点模具系统与多层片材形成圆顶形状的弯曲显著减少。此外，在使用新的F-MPIF-MLS工艺时，与常规MPIF工艺相比，最大厚度减少量从35%显著减少到5%，以实现成形部件的更均匀的厚度分布。
In this research, a new flexible multi-point incremental sheet forming process with multi-layer sheets (F-MPIF-MLS) was proposed. The novelty of this new forming process is demonstrated by two specific aspects of contribution. The first is the development of a new flexible multi-point die system to replace the conventional multi-point die, in which the multi-point pins are in contact with and provide support to the blank sheet from the start to the end of the forming operation. The second is the use of multi-layer sheets, which allows the target blank sheet to be deformed without clamping constraints. The new F-MPIF-MLS process clearly shows the benefits of overcoming the limitations of excessive sheet thinning and poor surface finish of the existing conventional multi-point incremental sheet forming (MPIF) process. A detailed comparative investigation into the new F-MPIF-MLS and the conventional MPIF processes is conducted through experimental testing and finite element (FE) simulation. The results show a noticeable reduction of wrinkling by using the new flexible multi-point die over the conventional multi-point die system with multi-layer sheets to form a dome shape. Moreover, in using the new F-MPIF-MLS process, the maximum thickness reduction is significantly reduced from 35% to 5% as compared to the conventional MPIF process to achieve a more uniform thickness distribution of the formed part.