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| Electromagnetic Force Distribution and Forming Performance in Electromagnetic Tube Expansion Process with Two Coils |
| Qiu Li1,2, Yang Xinsen1, Chang Peng1, Xiong Qi1, Su Pan1 |
1. College of Electrical Engineering and New Energy China Three Gorges UniversityYichang 443002 China;
2. Hubei Provincial Key Laboratory for Operation and Control of Cascaded Hydropower Station Yichang 443002 China |
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Abstract Electromagnetic tube expansion with axial compression can be realized by a three-coil system, which can solve the problem of the wall thinning existing in the traditional single-coil system. However, its tooling structure is complicated and the coils are difficult to match, resulting in unsatisfactory expansion effect. This paper proposes a two-coil system to realize the bidirectional loading of axial electromagnetic force and radial electromagnetic force more simply and effectively. In this method, two same coils are placed at the top and the bottom of the tube respectively, which can provide both axial and radial electromagnetic forces if the shape and size of the coils and the relative position of the coils to the tube are optimized. The structures of the coils are hence simplified while the bidirectional loading of axial electromagnetic force and radial electromagnetic can be achieved. An electromagnetic-structural coupling finite element model is established to compare the electromagnetic force distribution and tube expansion property of single-coil system, three-coil system and two-coil system. Furthermore, the influence of the coil geometric parameters on the electromagnetic force distribution and the wall thickness is studied. The results show that the two-coil system can generate greater axial electromagnetic force, and the wall thickness reduction is 28.2% smaller than the traditional single-coil system. Because the structure is simplified and the coils are easy to math, the two-coil system has obvious technical advantages and application prospects.
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Received: 09 July 2018
Published: 29 July 2019
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2019, Vol. 34 
