J Shanghai Jiaotong Univ Sci

Journal of Shanghai Jiao Tong University (Science) ›› 2019, Vol. 24 ›› Issue (4): 409-416.doi: 10.1007/s12204-019-2092-4

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Investigation on Two Electrically-Assisted Forming Processes of AZ31B Magnesium Alloy Sheets

Investigation on Two Electrically-Assisted Forming Processes of AZ31B Magnesium Alloy Sheets

LIU Kai (刘凯), DONG Xianghuai *(董湘怀), SHI Wen (石文), WANG Xinbao (王新宝), WU Guohong (吴国洪)   

  1. (1. National Engineering Research Center of Die & Mold CAD, Shanghai Jiao Tong University, Shanghai 200030, China; 2. Shanghai Aircraft Manufacturing Co., Ltd., Shanghai 201324, China; 3. Dongguan Hengli Mold Technology Industry Development Co., Ltd., Dongguan 523470, Guangdong, China)
  2. (1. National Engineering Research Center of Die & Mold CAD, Shanghai Jiao Tong University, Shanghai 200030, China; 2. Shanghai Aircraft Manufacturing Co., Ltd., Shanghai 201324, China; 3. Dongguan Hengli Mold Technology Industry Development Co., Ltd., Dongguan 523470, Guangdong, China)
  • Online:2019-08-01 Published:2019-07-29
  • Contact: DONG Xianghuai *(董湘怀) E-mail:dongxh@sjtu.edu.cn

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Abstract: Two new types of electrically-assisted forming (EAF) processes of AZ31B magnesium alloy sheets, i.e., electrically-assisted blanking (EAB) and electrically-assisted sheet upset-extruding (EASUE), are proposed in this paper. During EAB, pulsed current (PC) decreases blanking load and improves blanked surface quality, and higher frequency has a more effective improvement; when the frequency reaches 600 Hz, the whole punched hole fracture is improved to smooth zone. Moreover, EAB does not influence the microstructure and does not induce obvious annealing, and this process is advantageous to the materials that cannot change microstructure. During EASUE, PC can reduce extrusion load and enhance extrusion height, and higher frequency also has a more effective improvement. Both processes indicate that introducing PC can effectively improve the part quality and have an application prospection.

Key words: electrically-assisted blanking (EAB) | electrically-assisted sheet upset-extruding (EASUE)| pulsed current (PC)| AZ31B magnesium alloy| electroplasticity

摘要： Two new types of electrically-assisted forming (EAF) processes of AZ31B magnesium alloy sheets, i.e., electrically-assisted blanking (EAB) and electrically-assisted sheet upset-extruding (EASUE), are proposed in this paper. During EAB, pulsed current (PC) decreases blanking load and improves blanked surface quality, and higher frequency has a more effective improvement; when the frequency reaches 600 Hz, the whole punched hole fracture is improved to smooth zone. Moreover, EAB does not influence the microstructure and does not induce obvious annealing, and this process is advantageous to the materials that cannot change microstructure. During EASUE, PC can reduce extrusion load and enhance extrusion height, and higher frequency also has a more effective improvement. Both processes indicate that introducing PC can effectively improve the part quality and have an application prospection.

关键词: electrically-assisted blanking (EAB) | electrically-assisted sheet upset-extruding (EASUE)| pulsed current (PC)| AZ31B magnesium alloy| electroplasticity

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