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Sheet Metal Working
Published in Sherif D. El Wakil, Processes and Design for Manufacturing, 2019
The basic idea for the process of electrohydraulic forming, which has been known for some time, is based on discharging a large amount of electrical energy across a small gap between two electrodes immersed in water, as shown in Figure 6.52. The high-amperage current resulting from suddenly discharging the electrical energy from the condensers melts the thin wire between the electrodes and generates a shock wave. The shock wave lasts for a few microseconds; it travels through water to hit the blank and forces it to take the shape of the die cavity. The use of a thin wire between the electrodes has the advantages of initiating and guiding the path of the spark, enabling the use of nonconductive liquids; also, the wire can be shaped to suit the geometry of the required product. The method is also safer than explosive forming and can be used for simultaneous operations like piercing and bulging. Nevertheless, it is not suitable for continuous production runs because the wire has to be replaced after each operation. Moreover, the level of energy generated is lower than that of explosive forming. Therefore, the products are generally smaller than those produced by explosive forming.
High Energy Rate Forming (HERF)
Published in Gary F. Benedict, Nontraditional Manufacturing Processes, 2017
With proper design, electrohydraulic forming is capable of the same performance described in the section on electromagnetic forming. However unlike elctro-magnetic forming, electrohydraulic forming can be performed on poor conductors and is typically cheaper because expensive coils do not have to be designed and built. Figure 8.13 shows an example of a part formed by this process.
Antisymmetric deformation behavior during eccentric explosion electro-hydraulic sheet forming process
Published in Materials and Manufacturing Processes, 2023
Ziye Wang, Zhipeng Lai, Xiaotao Han, Liang Li
Electrohydraulic forming (EHF) is a high-velocity forming process, which utilizes the under-water electrical-explosion phenomenon to induce a high shockwave pressure, so as to plastically re-shape the metal workpiece.[1–3] Owing to the high deformation velocity (~100 m s−1) and high strain rate (~103 s−1), it can substantially enhance the formability of numerous low-ductility metal materials.[4–7] Moreover, it may also provide the merits of higher process quality and flexibility.[8–11] These advantages endow EHF with potential benefits for industrial applications, such as metallic RF cavity,[12] automobile doors,[13] handicrafts,[14] and so on.