Abstract
Uneven axial deformation is the current main issue of the tubes electromagnetic bulging technology which calls for innovative and cost-effective solutions. This paper presents a new method to overcome the above-mentioned issue based on employing a magnetic field shaper. The proposed magnetic field shaper is employed in the middle of the pipe and the driving coil. Induced eddy current control is realized by changing the structural parameters of the magnetic field shaper; thereby regulating the electromagnetic force distribution. The effectiveness of the proposed method is investigated through numerically comparing the electromagnetic performance of two EMF setups; traditional coil-based loading model and magnetic field shaper driving coil-based loading model proposed in this paper. The influence of the magnetic field shaper structural parameters on the tube electromagnetic forming performance is examined for optimum structure design. Results reveal that the concave profile of the radial electromagnetic force in the traditional loading method can be effectively improved using the proposed loading in this paper. The introduction of a magnetic field shaper not only changes the induced eddy current distribution, but also regulates the electromagnetic force profile in the axial-direction of the pipe which effectively enhances the uniform range of the pipe electromagnetic bulging, the maximum uniform deformation area is increased from 9mm to 35mm.
Highlights
Electromagnetic forming (EMF) is a technology that employs electromagnetic-force pulsation to realize metallic workpiece processing [1,2,3]
- present a precise model for the proposed EMF topology. -investigate the effect of the inner and outer wall heights of the magnetic field shaper on the pipe EMF performance. - numerically compare the performance of the proposed EMF topology with the traditional method
To solve the problem of uneven axial deformation of the existing tube electromagnetic bulging, this paper presents an EMF technology using a magnetic field shaper
Summary
Electromagnetic forming (EMF) is a technology that employs electromagnetic-force pulsation to realize metallic workpiece processing [1,2,3]. Based on the processing object [12,13], EMF is divided into tube or plate type process [14,15,16] In both types, uniformity of workpiece deformation has been a sustained issue that has not been fully resolved yet regardless the several attempts presented in the literature [17, 18]. The introduction of a magnetic concentrator in the literature was mainly to strengthen the magnetic field and electromagnetic-force on a specific area with no evidence so far for improving the entire deformation uniformity of the workpiece. - suggest a tube electromagnetic bulging process based on magnetic field shapers to improve the pipe deformation in the axial direction. - present a precise model for the proposed EMF topology. -investigate the effect of the inner and outer wall heights of the magnetic field shaper on the pipe EMF performance. - numerically compare the performance of the proposed EMF topology with the traditional method
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