AZ31镁合金管件电磁吸引式成形动态特性研究

doi:10.19595/j.cnki.1000-6753.tces.220495

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Abstract Electromagnetic forming (EMF) technology can effectively improve the forming limit of light alloys at room temperature, suppress the spring-back of the workpiece, and reduce wrinkling. It has been widely used in the plastic processing of aluminum alloy workpieces. However, compared with aluminum alloys, magnesium alloys have lower electrical conductivity and higher yield strength, so conventional EMF technology can not satisfy the plastic processing of magnesium alloy workpieces at room temperature. Recently, some scholars used high-conductivity alloys as driving plates or heating devices to assist in forming, but the tooling was complex and the forming quality was difficult to guarantee. It was not satisfied small tube forming even more. To address these issues, this paper proposes an electromagnetic attraction forming method for magnesium alloy tubes at room temperature. By establishing a finite element simulation model, the feasibility of the forming scheme, the discharge and electromagnetic parameters and the deformation of workpiece were studied in the artic.
Firstly, AZ31B magnesium alloy tube with an inner diameter of 10 mm, a length of 100 mm and a thickness of 2 mm are selected, and the dual-frequency discharge current method is used to generate attractive forces to drive the forming of the tube. Secondly, due to the extremely fast and complex electromagnetic forming, it is necessary to use simulation to explore the relationship between the parameters in the attractive electromagnetic forming process in detail. Finally, a finite element model considering the influence of tube displacement and deformation rate has been developed, the method realizes the full coupling between the electromagnetic fields and workpiece deformation.
Simulation results show that the process of electromagnetic forming can be divided into the following three stages: the stage before the short pulse current is turned on; the deformation stage; the vibration stage. Changing the long-pulse voltage U_s or the short-pulse voltage U_f can change the time-space distribution of electromagnetic parameters at point O, and ultimately regulate the motion state of the tube. During the short-pulse current conduction stage, the electromagnetic parameters at point O have opposite signs, the tube is subjected to a repulsive force. When U_s is 9.4 kV and U_f is 13 kV, the tube is radially contracted by 0.27 mm, the final deformation area dent marks will appear and the deformation flatness will be poor. In the deformation stage, the electromagnetic parameters at point O have the same sign, and the tube is deformed by the attractive force. When U_f is 13 kV, U_s increases from 4.4 kV to 8.4 kV, the action time of the attractive force in the deformation stage will become longer. The final radial expansion displacement of the tube will become larger. When U_s is 8.4 kV and U_f is raised from 13 kV to 23 kV, the electromagnetic force and radial expansion velocity of point O in the deformation stage both increase. However, the final displacement at 23 kV is only 5.84 mm, much lower than 7.13 mm at 21 kV. To study this phenomenon, U_f was raised from 21 kV to 23 kV (0.5 kV intervals). In the vibration stage, the peak shrinkage radial velocity at 21 kV and 21.5 kV were 12.8 m/s and 13.4 m/s, respectively, and the peak shrinkage velocity increased to 32.9 m/s at 22.5 kV. At this time, the repulsive force will dominate the motion state of the tube in the vibration stage, so the final deformation effect is not good.
Through the simulation analysis, the following conclusions can be drawn: 1) In practical engineering, it should be considered whether U_s will cause necking in the workpiece before the short pulse is turned on. 2) Since U_s has a lower upper limit, increasing U_s is more effective than increasing U_f. It can improve the deformation effect of the tube fitting. 3) The upper limit of U_f will be determined by the motion state of the tube fitting in the vibration stage, that is, the velocity movement trend of the tube fitting in this stage should be roughly the same. If the shrinkage speed is significantly increased, U_f cannot be further increased.

Key words： Electromagnetic forming dynamic characteristics tube attraction force AZ31magnesium alloy

Received: 01 April 2022

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TM154

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	Xiong Qi
	Zhu Xinhui
	Zhao Xiang
	Fan Liping

Cite this article:

Xiong Qi,Zhu Xinhui,Zhao Xiang等. Research of Dynamic Characteristics in Electromagnetic Attraction Forming of AZ31 Magnesium Alloy Tube[J]. Transactions of China Electrotechnical Society, 0, (): 7-7.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.220495 OR https://dgjsxb.ces-transaction.com/EN/Y0/V/I/7

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