Electromagnetic Attraction-Based Bulge Forming in Small Tubes: Fundamentals and Simulations

Xiong, Qi; Tang, Hongtao; Deng, Changzhen; Li, Liang; Qiu, Li

doi:10.1109/tasc.2017.2785778

Cited by 21 publications

(13 citation statements)

References 11 publications

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“…It also should be noted out that the small tube bulging needs to generate a large radial Lorentz force pointing outward. According to the literature [1,[11][12], the radial attraction force acting on the tube can be expressed by:…”

Section: A Basic Principle Of Tube Forming With Electromagnetic Attrmentioning

confidence: 99%

“…It has been proved that the full coupling method still has enough reliability, high efficiency and acceptable accuracy. In references [11][12][13][14][15], researchers simplified the 3D solenoid coil model into a 2D axisymmetric full coupling model to analyze the forming process of the workpiece, as shown in Fig.3. These obviously improve the computational efficiency and precision of the EMF process.…”

Section: ) Simplifications In the Geometry Model Of Solenoid Coilmentioning

confidence: 99%

“…But at present, there only exist several researches on electromagnetic attraction forming of tube alloys, especially on small tube alloys. Therefore, Xiong et al [12][13] proposed to place a forming coil outside the tube to generate an electromagnetic attraction to drive the small tube bulging, and designed a bulging experiment program of small tube parts based on the electromagnetic attraction through the dual-frequency current method. The final experiment results showed that a larger electromagnetic force of attraction was generated in the small tube parts, which made the small tube parts eventually expand.…”

Section: Introductionmentioning

confidence: 99%

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Optimization of the Attractive Electromagnetic Bulging of Small Tubes Based on Non-Uniform Solenoid Coils

et al. 2020

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The attractive electromagnetic bulging is a novel technology which has unique advantages in the formation of small tube fittings. To generate the attractive electromagnetic force, a dual-frequency current method has been proposed in the existing research on the attraction bulging of the small tube fittings. This method, however, has a flaw that the tube fittings are subjected to a large repulsion electromagnetic force before the attraction, which will lead to a negligible effect on the final forming results. To solve this problem, a non-uniform solenoid coil structure is proposed in this paper to suppress the repulsion to improve the attraction. On this basis, a finite element model is built to analyze the process of an aluminum tube with an inner diameter of 20 mm and an outer diameter of 22 mm and the thickness of 1 mm. The influences of the coil structure on the magnetic induction intensity B, eddy current density Je and the stress of the coil have been studied. The results show that the expansion of the tube can be improved when the non-uniform solenoid coil is used. The maximum expansion in this dissertation is achieved with a 28 turns non-uniform solenoid, and its expansion uniformity standard deviation is only 0.156. These simulations have a significant outcome to the design of the coils and the application of electromagnetic bulging in small tube fittings. INDEX TERMS Electromagnetic forming, numerical simulation, metal tube, bulging, solenoid coil.

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Section: A Basic Principle Of Tube Forming With Electromagnetic Attrmentioning

confidence: 99%

Section: ) Simplifications In the Geometry Model Of Solenoid Coilmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optimization of the Attractive Electromagnetic Bulging of Small Tubes Based on Non-Uniform Solenoid Coils

et al. 2020

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“…Hence, researchers usually use software such as COMSOL [12][13][14] , ANSYS/MEGA [15][16] and LS-DYNA [17][18] to analyze the magnetic field by equating the solenoid coil model with a 2-D or 3-D axisymmetric model. What's more, these studies mainly focus on aspects such as electromagnetic bulging [19][20] , electromagnetic welding [21][22] , electromagnetic superposed forming [23] , and the electromagnetic-assisted forming [24][25] .…”

Section: Introductionmentioning

confidence: 99%

Pitch Effect of Helical Coils of Electromagnetic Forming

Zhang

Zhou

Liang³

et al. 2020

IEEE Access

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“…electromagnetic forming (EMF) technology has garnered considerable attention in shaping tubes and sheet metals. EMF of sheet metals and tube fittings has been applied in electromagnetic bulging [1]- [4], electromagnetic welding [5], electromagnetic compression [6], [7], electromagnetic stamping [8], [9], electromagnetic incremental forming [10], etc.…”

Section: Introductionmentioning

confidence: 99%

A Dual-Coil Method for Electromagnetic Attraction Forming of Sheet Metals

et al. 2020

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Electromagnetic forming is a novel technology in which a coil is used to generate a pulsed Lorentz force for shaping sheet metal pieces. However, the Lorentz force between the coil and the sheet metal is generally repulsive due to the Lenz's Law, which limits the practical application of this technology. To break this bottleneck, a dual-coil method is proposed to generate attractive Lorentz force, which is then used to form sheet metals. The theoretical principle of this method is presented, and an infinite element model is established to simulate the forming effect. The simulation results show that an A1060-O plate with a diameter of 140 mm and thickness of 1 mm can be attractively shaped under this method. The maximum axial displacement of the plate reaches 2.74 mm. Unfortunately, a dent exists in this situation. Further analysis indicates that this dent can be eliminated by increasing the inner and outer diameters of the coils. Further, it is found that when the capacitance value of the long pulse-width discharge circuit is set to 5.6 mF and the initial discharge voltage is set to 10.690 kV, the sheet metal attains the best shape.

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Electromagnetic Attraction-Based Bulge Forming in Small Tubes: Fundamentals and Simulations

Cited by 21 publications

References 11 publications

Optimization of the Attractive Electromagnetic Bulging of Small Tubes Based on Non-Uniform Solenoid Coils

Optimization of the Attractive Electromagnetic Bulging of Small Tubes Based on Non-Uniform Solenoid Coils

Pitch Effect of Helical Coils of Electromagnetic Forming

A Dual-Coil Method for Electromagnetic Attraction Forming of Sheet Metals

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