The Formability and Hot Stamping of Magnesium Alloy Sheets

2014 ◽  
Vol 1063 ◽  
pp. 215-218 ◽  
Author(s):  
Guang Sheng Huang ◽  
Li Fei Wang ◽  
Fu Sheng Pan ◽  
Ming Tu Ma
Keyword(s):  
Magnesium Alloy ◽  
Strain Rate ◽  
Hot Stamping ◽  
Alloy Sheet ◽  
Mg Alloys ◽  
Mg Alloy ◽  
Az31 Magnesium Alloy ◽  
Blank Holder Force ◽  
Blank Holder ◽  
Cold Stamping

Mg alloy is a potential material to be used in automobile, especially in the stamping products. Through texture weakening, temperature increasing, strain rate decreasing, blank holder force controlling, lubrication choosing and so on, the formability of AZ31 magnesium alloy is improved so that the cold stamping on some simple products can be conducted. However, on the complicated products, hot stamping should be considered. Temperature has an important effect on the formability of Mg alloy sheet. As the temperature increasing, the strength of Mg alloys sheet decreases while the formability increases. Hot stamping process is an effective way to broaden the using of Mg alloys.

Numerical Simulation of Warm Deep Drawing of AZ31 Magnesium Alloy Sheet with Variable Blank Holder Force

2007 ◽  
Vol 340-341 ◽  
pp. 639-644 ◽  
Author(s):  
Ying Hong Peng ◽  
Qun Feng Chang ◽  
Da Yong Li ◽  
Hu Jie ◽  
Xiao Qin Zeng
Keyword(s):  
Numerical Simulation ◽  
Magnesium Alloy ◽  
Deep Drawing ◽  
Alloy Sheet ◽  
Az31 Magnesium Alloy ◽  
Blank Holder Force ◽  
Blank Holder ◽  
Magnesium Alloy Sheet ◽  
Variable Blank Holder Force ◽  
Az31 Magnesium Alloy Sheet

Blank holder force (BHF) plays an important role in sheet metal forming. Previous studies demonstrated that variable blank holder forces can improve the cold formability of steel blank, but the research on the application of variable blank holder force in warm forming of magnesium sheet forming has not been well investigated. In this study, the mechanical property of AZ31 magnesium alloy sheet is measured through some uniaxial tensile tests. In order to obtain the variational rule of the BHF, a mathematical model of BHF is deduced based on the energy theory. The variational rule of the BHF over the punch stroke is analyzed. Finally, three profiles of the BHF curve are designed, and the numerical simulation of warm deep drawing process of magnesium alloy sheet is also performed. A suitable variable blank holder force scheme is obtained through comparison among three results of simulation. The simulation indicates that the limiting drawing ratio of AZ31 magnesium alloy sheet can be improved from 3.0 to 3.5 with the suitable blank holder force varied by an inverted V curve.

Research on Flow Stress of Magnesium Alloy Sheet under Warm and High Strain Rate Forming Condition

2011 ◽  
Vol 189-193 ◽  
pp. 2522-2525
Author(s):  
Zheng Hua Meng ◽  
Shang Yu Huang ◽  
Jian Hua Hu
Keyword(s):  
Flow Stress ◽  
Magnesium Alloy ◽  
High Strain Rate ◽  
Strain Rate ◽  
Process Simulation ◽  
High Strain ◽  
Alloy Sheet ◽  
Az31 Magnesium Alloy ◽  
Rate Condition ◽  
Magnesium Alloy Sheet

Process simulation is a powerful tool to predict material behaviors under specified deformation conditions, so as to optimize the processing parameters. The equation for flow stress is important to numerically analyze. However, the reported constitutive equations of magnesium alloy are only suitable for processing simulation with strain rate between 0.001-1s-1. In this paper, the strain-stress behavior of AZ31 under warm and high strain rate (>103s-1) condition has been investigated by split Hopkinson pressure bar experiments at elevated temperature. The results show that the influence of the temperature on flow stress is more obvious than that of strain rate; the flow stress decreases with the rise of temperature at a certain strain rate. Based on Johnson-Cook model, the constitutive equation of AZ31 magnesium alloy under warm and high strain rate condition has been given out by fitting the experimental data, which can be applied in process simulation of AZ31 magnesium alloy sheet forming.

Effects of Strain Rate and Temperature on Yield Locus for AZ31 Magnesium Alloy Sheet

2007 ◽  
pp. 119-124
Author(s):  
Tetsuo Naka ◽  
Masanori Hayakashi ◽  
Yasuhide Nakayama ◽  
Takeshi Uemori ◽  
Masahide Kohzu ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Strain Rate ◽  
Alloy Sheet ◽  
Yield Locus ◽  
Az31 Magnesium Alloy ◽  
Magnesium Alloy Sheet ◽  
Az31 Magnesium Alloy Sheet

scholarly journals Effect of Texture of AZ31 Magnesium Alloy Sheet on Mechanical Properties and Formability at High Strain Rate

2007 ◽  
Vol 48 (4) ◽  
pp. 764-768 ◽  
Author(s):  
Masahide Kohzu ◽  
Tomoya Hironaka ◽  
Shota Nakatsuka ◽  
Naobumi Saito ◽  
Fusahito Yoshida ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Alloy Sheet ◽  
Az31 Magnesium Alloy ◽  
Magnesium Alloy Sheet ◽  
Az31 Magnesium Alloy Sheet

Investigation about the Oil Pressure Rate in the Warm Hydroforming of an Al-Mg Alloy Component

2016 ◽  
Vol 716 ◽  
pp. 963-972
Author(s):  
Gianfranco Palumbo ◽  
Antonio Piccininni ◽  
Pasquale Guglielmi ◽  
Vito Piglionico ◽  
Donato Sorgente ◽  
...  
Keyword(s):  
Strain Rate ◽  
Mg Alloy ◽  
Blank Holder Force ◽  
Blank Holder ◽  
Integration Platform ◽  
Force Profile ◽  
Hydroforming Process ◽  
Cavity Filling ◽  
Warm Hydroforming ◽  
High Level

In this work, the hydroforming process in warm conditions was used for manufacturing an Al-Mg alloy (AA5754) benchmark component displaying different strain levels due to its geometry. The attention was focused on the effect of the rate to increase the forming pressure (PR), strictly related to the strain rate the material is subjected to. In fact, preliminary tensile and Nakajima tests (both at room temperature and in warm conditions) revealed that the mechanical and formability properties of the investigated alloy are strongly affected by the strain rate. Warm Hydroforming tests were conducted in order to investigate both the working temperature and the parameter PR. The Blank Holder Force profile was varied according to an experimentally determined profile able to avoid oil leakages. Experimental results were collected in terms of output variables related to the die cavity filling and to the strain level reached on the component: in such a way a multi-objective optimization could be carried out using the commercial integration platform modeFRONTIER. The best compromise between the high level of the component deformation and the cycle time could be obtained by conducting the warm hydroforming process at the temperature of 250°C and setting the parameter PR equal to 0.1 MPa/sec.

Effect of Process Parameters on Damage during the Warm Drawing of Magnesium Alloy Shell for Notebook PC

2011 ◽  
Vol 339 ◽  
pp. 487-490
Author(s):  
Ying Tong
Keyword(s):  
Magnesium Alloy ◽  
Low Temperature ◽  
Process Parameters ◽  
Alloy Sheet ◽  
Drawing Process ◽  
Optimal Parameters ◽  
Damage Factor ◽  
Blank Holder Force ◽  
Blank Holder ◽  
Damage Criteria

The warm drawing process from magnesium alloy sheet to notebook PC shell reveals specialities due to the low plasticity under low temperature of magnesium alloy. As Cockroft-Lathem ductile damage criteria has been introduced, the damage factors and their distribution were calculated by a series of simulations for the warm drawing process. Then the effect of a series of forming parameters on the maximum damage factor was analyzed and the crack regions were identified as the piece corners. Based on the objective of minimizing the damage factor a set of optimal parameters were achieved: temperature 250 °C, press speed 4mm/s, friction factor 0.09, concave die fillet radius 5.1mm, blank holder force 0.7 MPa, clearance between punch and die 1.15 mm.

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