Abstract
Non-uniform axial deformation and tube wall thinning are the main issues restricting the further development of the tube electromagnetic bulging technology. Aiming at overcoming these issues, a tube electromagnetic bulging method based on convex driving coil is proposed in this paper. An electromagnetic-structure coupling model of the tube electromagnetic expansion process is established and the influence of detailed convex coil parameters on radial and axial Lorentz forces are analyzed. Results show that with the new proposed method, the homogeneous length of the tube axial deformation is 4.7 times that of the expansion loading with conventional driving coil. Meanwhile, the issue of tube wall thinning in the conventional electromagnetic bulging method is restrained due to the produced axial electromagnetic force using the proposed convex coil. The proposed tube electromagnetic bulging based on convex coil can effectively overcome the issues currently exist in the conventional tube electromagnetic bulging and promote wide industrial application of the electromagnetic forming technology.
Highlights
Electromagnetic forming (EMF) is a high speed pulsed technology that has been developed to replace conventional mechanical forming [1]–[3]
This method exhibits two issues: 1- the magnetic flux density on the tube is mainly concentrated in axial direction, which results in a serious thinning of the tube wall thickness because of the produced radial electromagnetic force; 2- the generated radial electromagnetic force distribution is uneven in the axial direction, which introduces a convex profile of a small magnitude at both ends of the tube and large magnitude in the middle
In order to overcome the problem of tube wall thickness reduction, the authors of this paper proposed an axial compression tube electromagnetic bulging method using a coil at the top and bottom of the tube as shown in Fig. 2 (b) to augment the radial magnetic flux density and strengthen the axial electromagnetic force [25]
Summary
Electromagnetic forming (EMF) is a high speed pulsed technology that has been developed to replace conventional mechanical forming [1]–[3]. To tackle the problem of a tube wall thickness, Qiu et al [20] utilized the axial electromagnetic force to increase the axial flow of the pipe, and a magnetic pulse bulging method with three-coil axial compression was presented. The electromagnetic force distribution and the tubeforming performance under this new coil structure are analyzed through detailed finite element analysis
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