Investigation of the deformation stability in the incremental sheet forming process
Investigation of the deformation stability in the incremental sheet forming process
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DOI：
10.1051/matecconf/20152104012
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
S. Ai;B. Lu;H. Long;J. Chen;H. Ou
中科院分区：
文献类型：
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作者：
S. Ai;B. Lu;H. Long;J. Chen;H. Ou
板料渐进成形（ISF）是一种高度通用和灵活的快速制造复杂钣金零件的工艺。ISF工艺的独特特征之一是与传统板料成形工艺相比改善了成形性。这可能是由于局部变形的性质，这增加了ISF过程中的变形稳定性。虽然已经提出了许多假设，有没有直接的模拟和计算的ISF变形稳定性。为了更好地理解ISF过程，建立了一个分析模型来研究和分析材料变形稳定性。基于应力变化和力平衡的解析计算，建立了最大成形角与工艺稳定性条件之间的数学关系。为了验证所开发的模型，通过形成由AA1100材料制成的双曲线零件进行了实验。采用最大成形角作为ISF成形性的指标，将理论分析与实验结果进行了比较。结果表明，ISF变形稳定性是影响ISF成形性的关键因素之一。
Incremental sheet forming (ISF) is a highly versatile and flexible process for rapid manufacturing of complex sheet metal parts. One of the unique characters of the ISF process is the improved formability comparing to conventional sheet forming process. This may be due to the localized deformation nature, which increases the deformation stability in the ISF process. Although many hypotheses have been proposed, there is no direct modelling and calculation of the ISF deformation stability. Aiming to obtain a better understanding of the ISF process, an analytical model was developed to investigate and analyse the material deformation stability in this work. Based on the analytical evaluation of stress variations and force equilibrium, a mathematical relationship between the maximum forming angle and the process stability condition was established. To validate the developed model, experiments were carried out by forming a hyperbolic part made of AA1100 material. The maximum forming angle, as an indicator to the ISF formability, was employed compare the analytical evaluation and experimental result. It was found that the ISF deformation stability is one of the key factors that affect the ISF formability.