摘要
镁合金作为目前工程应用中最轻质的金属结构材料之一,因其多种优良特性而广泛应用于轻量化设备制造中。然而,镁合金在室温下的塑性形变能力较差,传统加工工艺难以满足镁合金工件成形制造的需求。利用电磁力驱动金属材料发生高速变形的电磁成形技术可有效解决上述问题,其极高的应变速率能显著改善镁合金材料的成形性能,提升室温下的成形极限。然而,目前关于镁合金电磁成形的研究,大多使用驱动片与加热装置辅助,其工装较为复杂,且工件变形质量难以保证;辅助装置的添加也难以用于微小管件的成形。因此该文提出室温下的镁合金管件电磁吸引式成形方法,通过建立有限元仿真模型,在理论上验证了其成形方案的可行性;进一步分析了放电参数、电磁参数对管件运动状态的调控规律,阐明管件变形过程中工件的动态特性。上述结论可为线圈结构设计和放电参数设计提供指导。
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.However,the tooling was complex,and the forming quality needed to be guaranteed.It is not even suitable for small tube forming.Therefore,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 workpiece deformation were studied.Firstly,AZ31B magnesium alloy tubes with an inner diameter of 10 mm,a length of 100 mm,and a thickness of 2 mm are selected.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 has been developed considering the influence of tube displacement and deformation.The method realizes the full coupling between the electromagnetic fields and workpiece deformation.Simulation results show that the electromagnetic forming process can be divided into three stages:the stage before the short pulse current is turned on,the deformation stage,and 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 an
作者
熊奇
朱鑫辉
赵翔
范李平
Xiong Qi;Zhu Xinhui;Zhao Xiang;Fan Liping(Hubei Provincial Engineering Technology Research Center for Power Transmission Line China Three Gorges University,Yichang 443002 China;Wuhan National High Magnetic Field Center Huazhong University of Science and Technology,Wuhan 430074 China;College of Electrical Engineering&New Energy China Three Gorges University,Yichang 443002 China;Yichang Power Supply Company State Grid Hubei Electric Power Corporation,Yichang 443002 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2023年第10期2577-2588,2636,共13页
Transactions of China Electrotechnical Society
基金
国家自然科学基金(51707104)
武汉强磁场学科交叉基金(WHMFC202121)资助项目。
关键词
电磁成形
动态特性
管件
吸引力
AZ31镁合金
Electromagnetic forming
dynamic characteristics
tube
attraction force
AZ31 magnesium alloy
