Bimetal tubes have useful applications in various industries where service conditions demand more different requirements in the tube core than its outside surface. The recent use of electromagnetic forces to deform or join metallic workpieces at high speeds has undergone rapid growth for materials processing. However, to date, no sufficient systematic understanding of the underlying principles of a subsequent high-speed electromagnetic tube bulging process to manufacture bimetal tubes has been gained. In this work, magnetic pulse cladding of Al/Fe clad bimetal tubes was analyzed by finite element modeling (FEM) using ANSYS software. The validity of FEM analyses was first confirmed by experiments in terms of the deformed shape. Second, the effect of cladding parameters (such as axial feeding being the dominant factor in the multi-step process) on the bulging and thinning behavior of the Al clad tube was presented in detail. Both the numerical simulation and experimental results show that no more than 70% of the bulging-coil length is an appropriate amount for the feeding length to prevent defects from being introduced by non-uniform deformation in the transition zone of the Al clad tube. The distributions of the magnetic flux line, magnetic force, and plastic strain in different cladding steps were then analyzed. It was concluded that during the multi-step cladding process, there was an uneven distribution of the magnetic field force along the transition zone. Consequently, inharmonious plastic deformation behavior occurs, which results in a limited acceleration of the transition zone to a certain impact velocity.
Bimetal tubes Magnetic pulse cladding Finite element (FE) simulation Axial feeding
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This work was supported by the National Natural Science Foundation of China (Grant Nos. 51705081, 51774097). The authors would like to thank the financial support from the Natural Science Foundation of Fujian Province (Grant No. 2018J05079); the Youth Teacher Educational Research fund of Fujian Provincial education office (Grant No. JAT170092); the Key Project of the Youth Natural Science Fund of Fujian Provincial University (Grant No. JZ160417); Fuzhou University Fund (Grant No. XRC-1676); Fuzhou University Testing Fund of Precious Apparatus (Grant No. 2017T020).
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