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Development of electrohydraulic forming process for sharp edged aluminum sheet

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Document pages: 10 pages

Abstract: Electrohydraulic forming (EHF) is a high-speed forming technology, which can improve the formability of workpiece. Therefore, this process can help engineers create products with sharper edges so that the radius of curvature of the product is less than 2   mm. As a high strain rate forming process, EHF process produces shock wave and pressure in the process of EDM between electrodes, resulting in high-speed impact between workpiece and die. Therefore, the objective of this study is to develop an EHF process for forming a lightweight material shell with sharp edges. In order to achieve this, we have adopted a5052-h32, which has been widely used in the electrical industry. After drawing a5052-h32 forming limit diagram (FLD) according to the standard limiting dome height (LDH) test, improvements to the formability via the EHF process were evaluated by comparing the strain between the LDH test and the EHF process. From results of the combined formability, it is confirmed that the formability was improved nearly twofold, and a sharp edge with less than 2 mm radius of curvature was created using the EHF process.

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