Numerical Simulation and Experimental Study on Hot Oil Thermostatic Temperature Forming of AZ31 Magnesium Alloy Sheet

doi:10.12068/j.issn.1005-3026.2024.02.004

Abstract

Abstract:

The formability of AZ31 magnesium alloy was studied by finite element simulation and forming experiment. It’s based on Dynaform simulation software and hot oil thermostatic forming equipment to explore a hot forming process which is suitable for magnesium alloy， and to analyze the microstructure of the formed parts. The results showed that by adjusting the process parameters such as the plate size， die R angle， blank holder force and friction coefficient， the bottom thinning rate of the formed part and the fracture tendency can be reduced， and the forming performance of magnesium alloy can be improved； and when the forming temperature is 200 ℃， the die R angle is 16 mm， the plate diameter is 80 mm， the appropriate blank holder force and friction coefficient are adjusted， it can obtain the best process window. Near the bottom of the formed parts， the grain size and the second phase size gradually decrease and tend to be uniform.

Key words: AZ31 magnesium, hot oil thermostatic forming equipment, process parameter, thinning rate, forming performance

CLC Number:

TG 394

Ben YU, Dong-xiao WANG, Yu LIU, Jian-ping LI. Numerical Simulation and Experimental Study on Hot Oil Thermostatic Temperature Forming of AZ31 Magnesium Alloy Sheet[J]. Journal of Northeastern University(Natural Science), 2024, 45(2): 179-186.

Figures/Tables 11

Fig. 1 Experimental process diagram

Fig. 2 Hot oil thermostatic forming equipment

Fig. 3 Modeling and mesh subdivision

Fig. 4 Simulation of hot oil thermostatic forming of plates with different die R angles

Fig. 5 Hot oil thermostatic forming experiment with different R angle molds

Fig. 6 Simulation of hot oil thermostatic forming of plates with different diameters

Fig. 7 Experiment of hot oil thermostatic forming of plates with different diameters

Fig. 8 Simulation and experiment of sheet hot oil thermostatic forming of plates with different blank holder force

Fig. 9 Simulation and experiment of hot oil thermostatic forming of plates under different friction coefficients

Fig. 10 Original state and metallographic microstructure of formed parts at t=200 °C，R=16 mm，P=8.5 MPa

Fig. 11 SEM images of formed parts at t=200 ℃，R=16 mm，P=8.5 MPa

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