Formability of Magnesium-Lithium Alloy Sheet by Multi-Stage Deep Drawing

2012 ◽  
Vol 706-709 ◽  
pp. 1164-1169 ◽  
Author(s):  
Yasunori Harada ◽  
Atsushi Yamamoto ◽  
Takayuki Goto ◽  
Eiji Nakamura
Keyword(s):  
Magnesium Alloy ◽  
Deep Drawing ◽  
Alloy Sheet ◽  
Ambient Temperatures ◽  
Deep Drawability ◽  
Lithium Alloy ◽  
Flat Sheet ◽  
Sheet Blank ◽  
Multi Stage ◽  
Blank Diameter

The formability of the magnesium-lithium alloy was examined by multi-stage deep drawing. Long cups of magnesium alloy were formed at ambient temperatures by multi-stage deep drawing processes. In multi-stage deep drawing, the magnesium-lithium alloy sheets were employed and a flat sheet blank is formed into a cylindrical by a punch. Various cups were drawn by exchanging the punch and ringed die. The die was flat in the first stage, and was taper without a blankholder in the subsequent stages. The effects of the ratio of blank diameter to punch diameter and blank thickness on the deep drawability were examined. It was confirmed that the Mg-Li alloy long-cups were successfully formed by a multi-stage deep drawing operation in cold.

Improved Formability and Deep Drawing of Cross-Rolled Magnesium Alloy Sheets at Elevated Temperatures

2005 ◽  
Vol 488-489 ◽  
pp. 461-464 ◽  
Author(s):  
Yong Chao Xu ◽  
Shi Hong Zhang ◽  
H.M. Liu ◽  
Z.T. Wang ◽  
W.T. Zheng ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Deep Drawing ◽  
Elevated Temperatures ◽  
Rolling Direction ◽  
Alloy Sheet ◽  
Rolled Sheet ◽  
Drawing Ratio ◽  
Cross Rolling ◽  
Magnesium Alloy Sheet ◽  
Cylindrical Cup

The extruded sheets were prepared at the temperature between 350ıand 400ı, and the magnesium alloy sheet was manufactured by a new method, cross rolling, in which the rolling direction was changed in each pass. At the time, deep drawing of magnesium alloy sheet was investigated at elevated temperatures. The results show that the sheet has refined-grain by cross-rolling after it was annealed at 250ı, and the formability is significantly improved at lower temperatures, which is superior to the extruded sheet and the one-way rolled sheet. Deep drawing of magnesium alloy was performed successfully, and cylindrical cup of limited drawing ratio (LDR) 2.6 and 35 mm deep rectangular box (65ı50) was achieved at the lower temperature of 170ı. The different types of fracture were analyzed and reasonable parameters were determined.

Formability of AZ31 Magnesium Alloy Sheet in Dry Press Forming Using Diamond-Coated Dies

2009 ◽  
Author(s):  
S. Tsuda ◽  
S. Yoshihara ◽  
S. Kataoka
Keyword(s):  
Surface Roughness ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Deep Drawing ◽  
Chemical Vapor ◽  
Alloy Sheet ◽  
Az31 Magnesium Alloy ◽  
Specific Strength ◽  
Press Forming ◽  
Forming Tools

Dry press forming which hasn’t used lubricants in the process is the attractive forming technique of zero emission for the lubricants. As one of the dry press forming techniques, the usage of dies coated with a chemical vapor deposition (CVD) diamond film, which are expected to be applied to forming tools owing to their high tribological properties, abrasion resistance and heat resistance, has been proposed. Magnesium alloys have attracted attention owing to their advantages over what such as, high specific strength and ease of recycling. However, they have intractable characteristics, and it is necessary to perform the forming technique at high temperature and to consider lubrication condition. In this study, diamond-coated dies were used in the deformation of magnesium alloy sheets without lubricants in press forming, and the formability of magnesium alloy and its effect on the surface texture of a formed-cup were investigated. Dry deep-drawing tests and dry ironing tests were carried out to estimate the effect of the diamond-coated dies on the formability of magnesium alloy sheets. Furthermore, the formability obtained using the above-mentioned tests was compared with that obtained in tests using non-lubricant dies with traditional lubricant. AZ31 magnesium alloy sheets (thickness: t0 = 0.5 mm) were deformed at 200 °C in dry deep-drawing tests. From the results, it was found that what can be deformed using diamond-coated dies. Moreover, a 20% reduction in drawing force was confirmed compared with the usage of the traditional lubricant (MoS2). Meanwhile, dry ironing tests were performed under conditions of 10% ironing ratio by a method similar to the dry deep-drawing tests. In general, the ironing process, which is the most difficult step in lubrication in sheet forming, has been enabled by the diamond coating technique. Furthermore, it was observed that the surface roughness of the formed-cup walls using the diamond-coated dies was 0.4 μmRz, and, 1.3 μmRz in case of MoS2. It was confirmed that the application of diamond-coated dies improved the surface roughness of the formed-cup. It produced an improvement in the formability of magnesium alloys compared with the traditional lubrication technique (use of MoS2). It was concluded that the validity of the use of diamond-coated dies became clear.

Study on Formability about ME20M Magnesium Alloy Sheet

2010 ◽  
Vol 136 ◽  
pp. 23-27
Author(s):  
Ting Fang Zhang ◽  
Shi Kun Xie
Keyword(s):  
Numerical Simulation ◽  
Magnesium Alloy ◽  
Deep Drawing ◽  
Material Model ◽  
Alloy Sheet ◽  
Simulation Software ◽  
Constitutive Relationship ◽  
Magnesium Alloy Sheet ◽  
Forming Temperature ◽  
Made In

Warm forming of magnesium alloy sheet has attracted more and more attention in recent years. Mechanics tension test has been made in this paper in order to study the constitutive relationship of ME20M magnesium alloy sheet at different temperatures and strain rates. And a constitutive relationship which includes a softening factor has been put forward. Warm deep drawing experiment and numerical simulation on ME20M magnesium alloy sheet have been made in which the attention was focused on the forming temperature. The results showed that the limit deep drawing height of ME20M magnesium alloy sheet can be dramatically improved as the temperature goes up, especially when the temperature was over about 250°C. Simultaneity, it is feasible and effective to add a material model into numerical simulation software by user subroutine.

Thermal Deep Drawing of Magnesium Alloy Sheets

2014 ◽  
Vol 971-973 ◽  
pp. 220-223
Author(s):  
Bo Wang ◽  
Xian Chang Mao
Keyword(s):  
Magnesium Alloy ◽  
Deep Drawing ◽  
Development Trend ◽  
Alloy Sheet ◽  
Solid Particles ◽  
Blank Holder ◽  
Forming Technology ◽  
Warm Deep Drawing ◽  
Plastic Forming ◽  
The Development Trend

Thermal deep-drawing is a main processing technology which is used to plastic forming for magnesium alloy sheet. Combined with the research status, several deep drawing methods were introduced in detail in this paper, including indirect heating deep drawing, direct heating deep drawing, differential temperature deep drawing, warm hydraulic deep drawing, warm deep drawing with solid particles, warm deep drawing with segmental blank-holder, pre-forming warm deep drawing. Finally, the development trend and burning questions of magnesium alloy thermal forming technology were predicted.

923 Formability of Magnesium-Lithium Alloy Sheet by Cold Deep Drawing

2012 ◽  
Vol 2012.87 (0) ◽  
pp. _9-23_
Author(s):  
Yasunori HARADA ◽  
Takayuki GOTO ◽  
Atsushi YAMAMOTO ◽  
Eiji NAKAMURA
Keyword(s):  
Deep Drawing ◽  
Alloy Sheet ◽  
Lithium Alloy

Formability of Beta Titanium Alloy in Multi-Stage Deep Drawing Process

2007 ◽  
Vol 345-346 ◽  
pp. 121-124
Author(s):  
Yasunori Harada ◽  
Kenzo Fukaura ◽  
Kenichiro Mori
Keyword(s):  
Titanium Alloy ◽  
Deep Drawing ◽  
Oxide Coating ◽  
High Reactivity ◽  
Alloy Sheet ◽  
Drawing Process ◽  
Beta Titanium Alloy ◽  
Deep Drawing Process ◽  
Beta Titanium ◽  
Multi Stage

In the multi-stage deep drawing processes of a beta titanium alloy sheet, the formability has been investigated. The beta titanium alloy sheets have sufficient ductility at room temperature, whereas a seizure tends to occur during deep drawing due to high reactivity with other materials. To prevent the seizure, the beta titanium alloy sheet was treated by oxide coating heating, because the coated sheet was not in direct contact with the die during deep drawing due to the existence of the oxide layer. The blank used was the commercial beta titanium alloy Ti-15V-3Cr-3Sn-3Al. The effect of the coating condition on the formability in the multi-stage deep drawing process was examined. It was found that long drawn cups with a height sixfold that of the diameter were successfully formed by oxide coating heating.

Study on Mould Structure of Differential Temperature Drawing Process for Magnesium Alloy

2011 ◽  
Vol 403-408 ◽  
pp. 4360-4363
Author(s):  
Zu Jian Yu ◽  
Jian Hui Li
Keyword(s):  
Surface Roughness ◽  
Magnesium Alloy ◽  
Stress Distribution ◽  
Deep Drawing ◽  
Cooling Water ◽  
Alloy Sheet ◽  
Drawing Process ◽  
Az31b Magnesium Alloy ◽  
Magnesium Alloy Sheet ◽  
Structure Surface

Magnesium alloy, differential temperature drawing, mould structure, surface roughness Abstract. To improve the formability of magnesium alloy sheet, the differential temperature drawing process was presented, and the mould structure of differential temperature drawing process for magnesium alloy was well-designed and fabricated by analyzing the friction and the stress distribution of material in drawing process. With the blank heated to 200-235°C at the flange by inserting heating coils and thermocouples in die and binder and the drawn cup cooled by injecting cooling water into die and punch, the differential temperature drawing process of magnesium alloy sheet was performed successfully and the value of surface roughness Ra1.6um was adopted for punch, Ra0.4um was adopted for die and binder. The result shows that by using the designed mould, the deep drawing performance of AZ31B magnesium alloy can be enhanced obviously and the value of LDR can be increased form 2.1 to 3.05.

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