Defect Formation in Different Characteristic Areas During Variable-Curvature Shell Room-Temperature Stamping of Cast-Rolled AZ31 Alloy

Understanding the stamping behavior of cast-rolled AZ31 magnesium alloy sheets at room temperature is helpful to promote its deep processing application. The research object selected in this paper is a variable-curvature shell with complex geometric features. The purpose is to investigate the effect...

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Bibliographic Details
Published in:JOM (1989) 2024-04, Vol.76 (4), p.1799-1809
Main Authors: Zheng, Wenxing, Ma, Lifeng, Jia, Weitao, Ning, Fangkun, Wang, Hengtao, Xie, Hongbo, Lu, Liwei, Yuan, Yuan
Format: Article
Language:English
Subjects:
Anisotropy
Blankholders
Clearances
Curvature
Defects
Deformation
Dies
Energy consumption
Formability
Forming limits
Fractures
Magnesium alloys
Magnesium base alloys
Mechanical properties
Metal sheets
Room temperature
Safety
Shape effects
Simulation
Software
Stamping
Tensile strength
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Summary:Understanding the stamping behavior of cast-rolled AZ31 magnesium alloy sheets at room temperature is helpful to promote its deep processing application. The research object selected in this paper is a variable-curvature shell with complex geometric features. The purpose is to investigate the effects of blank shape, blank holder force (BHF), and die clearance on the formability of cast-rolled AZ31 magnesium alloy shells, and to further clarify under reasonable process conditions defects that are prone to occur in the shell characteristic areas and limit the forming height of the shells. The results show that the proportion of the safety zone is obviously affected by the process conditions. It appears that the blank shape when approaching the cross-section of the shell is beneficial to improve the safety zone ratio. When the BHF is 65 kN and die clearance is 3 mm, the safety zone ratio will reach the maximum proportion of - 39.61%. During the stamping, there are obvious differences in defect formation between different characteristic areas. They are prone to crack in both the punch corner area and the die corner area, form insufficiently in the bottom zone and the transition zone, and form shear fractures in the flange area. The forming limit height of the variable-curvature shell has been determined to be ~ 13 mm.
ISSN:1047-4838
DOI:10.1007/sll837-023-06199-2