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Combined electrohydraulic and flexible pin die forming: a novel high strain rate forming die setup
The International Journal of Advanced Manufacturing Technology ( IF 3.4 ) Pub Date : 2020-10-24 , DOI: 10.1007/s00170-020-06242-5
Saeid Zavari , Mohammad Bakhshi-Jooybari , Hamid Gorji

Electrohydraulic forming (EHF) is one of the high-velocity metal forming processes that can significantly increase the formability of metals compared with quasi-static forming processes. On the other way, multi-point forming (MPF) is one of the flexible forming methods that provides different sheet metal geometries by varying the height of the pins. The purpose of this study is to take the advantages of both the EHF and MPF processes by presenting a design for flexible dies to be used in the electrohydraulic forming process. As the first step, electrohydraulic free-forming was performed to investigate the reproducibility and to obtain some of the parameters needed for simulations. Then, the ABAQUS finite element software and Coupled Eulerian-Lagrangian method were used to simulate this process. Afterward, the experimental tests were undergone to determine the defects of the forming process using a flexible pin die. Various geometries were produced by conducting experiments and inserting the proper elastic layer to eliminate the dimpling. The reproducibility and validity of the flexible pin die forming simulation was investigated by analyzing the dome height and final profile of the specimens. After ensuring the accuracy of the simulation, a thicker elastic layer was used to remove the dimpling defect completely. The results of the experiments and simulations illustrated that the use of flexible pin die is possible in the process of EHF and the proper final forms can be obtained by applying the appropriate thickness of the polyurethane layer.



中文翻译:

电动液压和柔性销模成型相结合:一种新颖的高应变率成型模具设置

电液压成型(EHF)是高速金属成型工艺之一,与准静态成型工艺相比,它可以显着提高金属的可成型性。另一方面,多点成形(MPF)是一种灵活的成形方法,该方法通过更改销的高度来提供不同的钣金几何形状。这项研究的目的是通过提出一种用于电动液压成型工艺的柔性模具的设计,来利用EHF和MPF工艺的优势。第一步,进行电液压自由成形以研究可重复性并获得模拟所需的一些参数。然后,使用ABAQUS有限元软件和Eulerian-Lagrangian耦合方法来模拟该过程。之后,进行了实验测试,以确定使用柔性销模的成型过程中的缺陷。通过进行实验并插入适当的弹性层以消除凹陷,可以生产出各种几何形状。通过分析样品的圆顶高度和最终轮廓,研究了柔性销模成型仿真的可重复性和有效性。在确保模拟的准确性之后,使用较厚的弹性层完全消除了凹陷缺陷。实验和模拟结果表明,在EHF工艺中可以使用柔性销模,并且可以通过施加适当厚度的聚氨酯层来获得合适的最终形式。通过进行实验并插入适当的弹性层以消除凹陷,可以生产出各种几何形状。通过分析样品的圆顶高度和最终轮廓,研究了柔性销模成型仿真的可重复性和有效性。在确保模拟的准确性之后,使用较厚的弹性层完全消除了凹陷缺陷。实验和模拟结果表明,在EHF工艺中可以使用柔性销模,并且可以通过施加适当厚度的聚氨酯层来获得合适的最终形式。通过进行实验并插入适当的弹性层以消除凹陷,可以生产出各种几何形状。通过分析样品的圆顶高度和最终轮廓,研究了柔性销模成型仿真的可重复性和有效性。在确保模拟的准确性之后,使用较厚的弹性层完全消除了凹陷缺陷。实验和模拟结果表明,在EHF工艺中可以使用柔性销模,并且可以通过施加适当厚度的聚氨酯层来获得合适的最终形式。通过分析样品的圆顶高度和最终轮廓,研究了柔性销模成型仿真的可重复性和有效性。在确保模拟的准确性之后,使用较厚的弹性层完全消除了凹陷缺陷。实验和模拟结果表明,在EHF工艺中可以使用柔性销模,并且可以通过施加适当厚度的聚氨酯层来获得合适的最终形式。通过分析样品的圆顶高度和最终轮廓,研究了柔性销模成型仿真的可重复性和有效性。在确保模拟的准确性之后,使用较厚的弹性层完全消除了凹陷缺陷。实验和模拟结果表明,在EHF工艺中可以使用柔性销模,并且可以通过施加适当厚度的聚氨酯层来获得合适的最终形式。

更新日期:2020-11-06
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