Electromagnetic forming of aluminum alloy strip by imposing inverse current instead of inducing eddy current
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ORIGINAL ARTICLE
Electromagnetic forming of aluminum alloy strip by imposing inverse current instead of inducing eddy current Xiaoyong Zeng 1 & Zhenghua Meng 2 & Wei Liu 1,3,4 & Shangyu Huang 1,3 & Shoulu Zhou 1 & Yangzhe Lin 1 Received: 9 April 2020 / Accepted: 4 November 2020 / Published online: 11 November 2020 # Springer-Verlag London Ltd., part of Springer Nature 2020
Abstract In the conventional electromagnetic forming processes, the Lorentz force is induced by the eddy current in the specimen, so the coil should be specifically designed to form the electrical current return. Here, a novel electromagnetic forming method is suggested for aluminum alloy strip or profile, in which the inverse current is imposed instead of eddy current to generate Lorentz force. As an electromagnetic actuator, a very simple strip of copper was connected in parallel with the aluminum alloy strip. When the impulse currents flowed synchronously along the opposite directions between the copper and aluminum alloy strips, the Lorentz force was generated to deform the aluminum alloy strip. The electromagnetic forming of AA5754 aluminum alloy strip by imposing inverse current was investigated by numerical simulation. It was finally validated by comparison with the experimental results. Keywords Electromagnetic forming . Aluminum alloy . Numerical simulation
1 Introduction With the urgent demands of energy conservation and emission reduction, aluminum alloys show great potential for lightweight engineering in aerospace and automobile industries. Although aluminum alloys exhibit the excellent advantages of low density, high strength, high corrosion resistance, good recyclability, and so on, the low formability of aluminum alloys at room temperature is often a great challenge. To solve this problem, the electromagnetic forming (EMF) is developed in these decades because the formability of aluminum alloys can be magnificently improved [1]. Besides this, the
* Wei Liu [email protected] 1
School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
2
School of Automotive Engineering, Wuhan University of Technology, Wuhan 430070, China
3
Hubei Engineering Research Center for Green Precision Material Forming, Wuhan University of Technology, Wuhan 430070, China
4
State Key Laboratory of Materials Processing and Die and Mould Technology, Huazhong University of Science and Technology, Wuhan 430070, China
benefits of EMF include high speed, no contact, small springback of deformed part and so on. In the EMF, the eddy current in the specimen is usually induced by the impulse current in the coil to generate the Lorentz forces. The structure of coil should be specifically designed not only to form the current return but also to consider the shape of specimen. With the conventional solenoid coil and flat spiral coil, EMF has been widely utilized in the aluminum alloy tube and sheet forming [2]. Although the uniform pressure actuator (UPA) was suggested for EMF of aluminum alloy sheet, it can be taken as a h
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