EFFECT OF HYDRAULIC PRESSURE ON WARM HYDRO MECHANICAL DEEP DRAWING OF MAGNESIUM ALLOY SHEET

2009 ◽  
Vol 23 (06n07) ◽  
pp. 1975-1980 ◽  
Author(s):  
WEI LIU ◽  
LINZHI WU ◽  
SHIJIAN YUAN
Keyword(s):  
Magnesium Alloy ◽  
Deep Drawing ◽  
Experimental Studies ◽  
Alloy Sheet ◽  
Forming Limit ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Hydraulic Pressure ◽  
Different Temperatures ◽  
Hydraulic Bulging

The uniaxial tensile test and hydraulic bulging test of AZ31 magnesium alloy sheets were applied to study the influence of temperature on the material properties and obtain the forming limit curves at different temperatures. Numerical simulations of warm hydro mechanical deep drawing were carried out to investigate the effect of hydraulic pressure on the formability of a cylindrical cup, and the simplified hydraulic pressure profiles were used to simulate the loading procedure of hydraulic pressure. The optimal hydraulic pressure at different temperatures were given and verified by experimental studies at temperature 100°C and 170V.

Thermo-Mechanical Coupled Simulation of Warm Stamping of AZ31 Magnesium Alloy Sheet

2007 ◽  
Vol 546-549 ◽  
pp. 281-284 ◽  
Author(s):  
Da Yong Li ◽  
Qun Feng Chang ◽  
Ying Hong Peng ◽  
Xiao Qin Zeng
Keyword(s):  
Magnesium Alloy ◽  
Alloy Sheet ◽  
Az31 Magnesium Alloy ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Drawing Process ◽  
Coupled Simulation ◽  
Magnesium Alloy Sheet ◽  
Force Transfer ◽  
Az31 Magnesium Alloy Sheet

Uniaxial tensile test of a cross rolled magnesium alloy sheet was conducted under different temperatures and strain rates. The mechanical propriety of AZ31 magnesium alloy sheet was analyzed according to the true strain-stress curves. Then the non-thermal drawing process, during which the temperature of die, blankholder and blank is 200°C while the punch is kept at room temperature, was simulated by the thermo-mechanical coupled finite element method. The deformation behavior and the temperature change in the drawing process was investigated. Due to the heat conduction, there was non-uniform distribution of temperature along flange area, force transfer area and deformation area. Therefore the resistance of the force transfer area is enhanced and the warm formability of magnesium alloy sheet can be further improved. The thermo-mechanical coupled simulation provides a good guide for the development of non-isothermal drawing techniques.

Forming Limit Diagram of the AMS 5599 Sheet Metal

2013 ◽  
Vol 58 (4) ◽  
pp. 1213-1217
Author(s):  
W. Fracz ◽  
F. Stachowicz ◽  
T. Trzepieciński ◽  
T. Pieją
Keyword(s):  
Mechanical Properties ◽  
Sheet Metal ◽  
Plastic Anisotropy ◽  
Experimental Studies ◽  
Forming Limit Diagram ◽  
Forming Limit ◽  
Uniaxial Tensile ◽  
Strain Hardening Exponent ◽  
Uniaxial Tensile Test ◽  
Anisotropy Ratio

Abstract Formability of sheet metal is dependent on the mechanical properties. Some materials form better than others - moreover, a material that has the best formability for one stamping may behave very poorly in a stamping of another configuration. For these reasons, extensive test programs are often carried out in an attempt to correlate material formability with value of some mechanical properties. The formability of sheet metal has frequently been expressed by the value of strain hardening exponent and plastic anisotropy ratio. The stress-strain and hardening behaviour of a material is very important in determining its resistance to plastic instability. However experimental studies of formability of various materials have revealed basic differences in behaviour, such as the ”brass-type” and the ”steel-type”, exhibiting respectively, zero and positive dependence of forming limit on the strain ratio. In this study mechanical properties and the Forming Limit Diagram of the AMS 5599 sheet metal were determined using uniaxial tensile test and Marciniak’s flat bottomed punch test respectively. Different methods were used for the FLD calculation - results of these calculations were compared with experimental results

Forming Limit of Magnesium Alloy Sheet in Hydromechanical Deep Drawing

2012 ◽  
Vol 482-484 ◽  
pp. 2086-2089 ◽  
Author(s):  
Xian Chang Mao ◽  
Ming Guang Wang
Keyword(s):  
Magnesium Alloy ◽  
Internal Pressure ◽  
Deep Drawing ◽  
Alloy Sheet ◽  
Forming Limit ◽  
Az31b Magnesium Alloy ◽  
Hydromechanical Deep Drawing ◽  
Magnesium Alloy Sheet ◽  
Deformation Behaviors ◽  
Az31b Magnesium Alloy Sheet

The experimental research on the hydromechanical deep drawing of AZ31B magnesium alloy sheet was conducted in this paper. The deformation behaviors and the influence of internal pressure on its formability are investigated, moreover, the fracture behaviors of the obtained workpieces are discussed. The experimental results show that the formability of AZ31B magnesium alloy sheet in hydromechanical deep drawing is poorer than that in mechanical deep drawing at room temperature because the internal pressure fails to work effectively due to the weak plastic deformation capacity and the premature fracture of the kind alloy.

Deformation Behaviors of AZ31B Magnesium Alloy Sheets in Hydraulic Deep Drawing

2010 ◽  
Vol 139-141 ◽  
pp. 520-523 ◽  
Author(s):  
Lian Fa Yang ◽  
Liang Yi ◽  
Xian Chang Mao ◽  
Guo Chen
Keyword(s):  
Magnesium Alloy ◽  
Deep Drawing ◽  
Radial Pressure ◽  
Alloy Sheet ◽  
Hydraulic Pressure ◽  
Az31b Magnesium Alloy ◽  
Corner Radius ◽  
Deformation Behaviors ◽  
Limit Drawing Height ◽  
Az31b Magnesium Alloy Sheet

Magnesium alloy sheets have poor formability at room temperature, and the hydraulic forming may be a choice to improve its formability. Experiments were conducted to investigate the deformation behaviors of AZ31B magnesium alloy sheet in radial pressure deep drawing, one of the hydraulic forming technologies. The influence of hydraulic pressure, die dimension, blank dimension on the limit drawing height (LDH) of the drawn workpieces is investigated, and the location, evolvement and pattern of the fractures are also analyzed. The research results show that the obtained LDH increases with the hydraulic pressure when the punch corner radius is large enough, the formability can be improved only under a proper moderate hydraulic pressure when the punch corner radius is small; moreover, the location of the fractures may be around the corner, on the flange and the sidewall of the drawn workpieces, which appears different evolvement directions and patterns through cross-section.

Research on the Warm Deep Drawing of AZ31 Magnesium Alloy Sheet Based on DYNAFORM

2011 ◽  
Vol 138-139 ◽  
pp. 754-758
Author(s):  
X.Q. Cao ◽  
J.W. Wang ◽  
Y. Liu ◽  
Cheng Zhong Chi ◽  
L.C. Li ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Magnesium Alloy ◽  
Deep Drawing ◽  
Alloy Sheet ◽  
Az31 Magnesium Alloy ◽  
Magnesium Alloy Sheet ◽  
Az31 Magnesium Alloy Sheet ◽  
Different Temperatures ◽  
Forming Temperature ◽  
Simulation Results

The effect of forming temperature on the deep drawability (limit drawing ratio (LDR)) of AZ31 magnesium alloy sheet was studied both numerically and experimentally by the use of finite element analysis software DYNAFORM and specially designed warm deep drawing die set. The simulation model was built by SolidWorks 2009, 3-Parameter_Barlat model with BT shell unit was adopted as material model. The constitutive relation of the material was provided by uniaxial isothermal tension tests at different temperatures. After being set, all parameters were referred to famous explicit dynamic solver LS-DYNA. The simulation results showed that the LDR of the AZ31 magnesium alloy sheet is increased with the increase of the temperature initially, but after the temperature reached 423K, the LDR reached the maximum, and then decrease with the increase of temperature in the temperature range studied (room temperature-673K). PTEF was used as lubricant in the experiment. Experimental results showed same trend as numerical simulation results in the studied range of temperature, and LDR reached the maximum of 3.0 at 423K. It is shown that the results of numerical simulation have a good agreement with that of the experiment. By analyzing the microstructure of the drawn-cup walls at different temperatures, it is found that grains were stretched along the direction of tension at temperatures lower than 423K. And there appeared a large number of fine recrystallized grains when forming temperature is 423K showing that dynamic recrystallization occurred during forming process. Dynamic recrystallization conducted completely when forming temperature increased higher than 423K, but the material softening would aggravate with the increase of temperature and on the contrary would do harm to the deep drawing of AZ31 magnesium alloy sheet, resulting the decrease of LDR.

Warm Formability of AZ31 Magnesium Alloy Sheets under Different Process Conditions

2008 ◽  
Vol 604-605 ◽  
pp. 379-387 ◽  
Author(s):  
Carlo Bruni ◽  
Archimede Forcellese ◽  
Filippo Gabrielli ◽  
M. Simoncini
Keyword(s):  
Magnesium Alloy ◽  
Tensile Tests ◽  
Az31 Magnesium Alloy ◽  
Forming Limit ◽  
Uniaxial Tensile ◽  
Process Conditions ◽  
Different Temperatures ◽  
Sheet Formability ◽  
Constitutive Parameters ◽  
Hemispherical Punch

The effect of the process parameters on the sheet formability of AZ31 magnesium alloy has been investigated by means of uniaxial tensile and hemispherical punch tests at different temperatures and strain rates. The results of the uniaxial tensile tests were analysed in terms of flow curves, ductility and microstructural evolution; the constitutive parameters were evaluated and related to the forming limit curves obtained by the hemispherical punch tests carried out at different temperatures and punch speeds.

scholarly journals Research on Hydroforming Micro-Sized Spiral Pipe With Equal Wall Thickness

2021 ◽  
Author(s):  
Changshuai Shi ◽  
Jinping Li ◽  
Xiaohua Zhu
Keyword(s):  
Wall Thickness ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Processing Temperature ◽  
Hydraulic Pressure ◽  
Outer Diameter ◽  
Forming Process ◽  
Spiral Tube ◽  
Positive Displacement ◽  
Different Temperatures

Abstract The positive displacement motor is currently the most widely used downhole power tool. In order to reduce the cost of drilling and exploration, small boreholes have been used to replace conventional boreholes. The working conditions are complex, so a high-performance positive displacement motor for micro-holes is required. In order to solve the problem of the difficulty in processing the inner spiral surface of the small size and large aspect ratio, the tiny size spiral tube stator is proposed in this paper and the normal temperature and hot state hydroforming of the small size spiral tube is proposed in this paper. The material is 42crmo, and the uniaxial tensile test is carried out at different temperatures. According to the material mechanical properties experiment and the forming process, the finite element model of the hydroformed spiral tube at different temperatures is established. The study found that the suitable tube size is 48mm in outer diameter, 5.5mm in wall thickness, and 1405mm in length. When the processing temperature is 700℃, the hydraulic pressure required for full expansion of the spiral tube is only 70MPa, and the rebound of the spiral tube is very small. The minimum wall thickness is the maximum of 4.31mm, and the maximum wall thickness is the minimum of 5.356mm, and the wall thickness distribution is relatively uniform. The maximum plastic strain of the spiral tube is 0.65, so the damage to the material during the forming process is small, and when the processing temperature is 700℃, the quality of the spiral tube is better.

Sign in / Sign up

Export Citation Format

Share Document