2) The thickness of magnesium alloy sheets mainly reduces at the punch corner region during shallow drawing. When the thickness strain exceeds 8%, the billets here are pulled to fracture. While a large region of the sheet thickness, in contact with the flat top of punch, remains invariable basically during cold deep drawing.

3) It is also confirmed that cell phone house can be produced successfully in crank press with AZ31B

magnesium alloy sheet underwent RUB by the stamping process. It provides an alternative to the electronics industry in the application of magnesium alloys. 

References

[1] MORI K, TSUJI H. Cold deep drawing of commercial magnesium alloy sheets [J]. CIRP Annals-Manufacturing Technology, 2007,56(1): 285−288.

[2] KLEINER M, GEIGER M, KLAUS A. Manufacturing of lightweight components by metal forming [J]. CIRP Annals-Manufacturing Technology, 2003, 52(2): 521−542.

[3] NEUGEBAUER R, ALTAN T, GEIGER M, KLEINER M, STERZING A. Sheet metal forming at elevated temperatures [J]. CIRP Annals-Manufacturing Technology, 2006, 55(2): 793−816.

[4] CHEN F K, HUANG T B, CHANG C K. Deep drawing of square cups with magnesium alloy AZ31 sheets [J]. International Journal of Machine Tools & Manufacture, 2003, 43(15): 1553−1559.

[5] ZHANG S H, ZHANG K, XU Y C, WANG Z T, XU Y, WANG Z G. Deep-drawing of magnesium alloy sheets at warm temperatures [J]. Journal of Materials Processing Technology, 2007, 185(1/3):147−151.

[6] CHANG Q F, LI D Y, PENG Y H, ZENG X Q. Experimental and numerical study of warm deep drawing of AZ31 magnesium alloy sheet [J]. International Journal of Machine Tools & Manufacture, 2007, 47(3/4): 436−443.

[7] DOEGE E, KURZ G. Development of a formulation to describe the work softening behavior of magnesium sheets for heated deep drawing processes [J]. CIRP Annals-Manufacturing Technology,2001, 50(1): 177−180.

[8] DOEGE E, DRÖDER K. Sheet metal forming of magnesium wrought alloys-formability and process technology [J]. Journal of Materials Processing Technology, 2001, 115(1): 14−19.

[9] WATANABE H, FUKUSUMI M, SOMEKAWA H, MUKAI T. Texture and mechanical properties of a superplastically deformed Mg-Al-Zn alloy sheet [J]. Scripta Materialia, 2008, 477(1/2): 153−161.

[10] IWANAGA K, TASHIRO H, OKAMOTO H, SHIMIZU K. Improvement of formability from room temperature to warm

temperature in AZ-31 magnesium alloy [J]. Journal of Materials Processing Technology, 2004, 155(SI): 1313−1316.

[11] HUANG X S, SUZUKI K, SAITO N. Microstructure and mechanical properties of AZ80 magnesium alloy sheet processed by differential speed rolling [J]. Materials Science and Engineering A, 2009,508(1/2): 226−233.

[12] CHINO Y, LEE J S, SASSA K, KAMIYA A, MABUCHI M. Press formability of a rolled AZ31 Mg alloy sheet with controlled texture [J]. Materials Letters, 2006, 60(2): 173−176.

[13] WATANABE H, MUKAI T, ISHIKAWA K. Differential speed rolling of an AZ31 magnesium alloy and the resulting mechanical properties [J]. Journal of Materials Science, 2004, 39(4): 1477−1480.

[14] HUANG X S, SUZUKI K, WATAZU A, SHIGEMATSU I, SAITO N. Improvement of formability of Mg–Al–Zn alloy sheet at low temperatures using differential speed rolling [J]. Journal of Alloys and Compounds, 2009, 470(1/2): 263−268.

[15] KIM W J, PARK J D, KIM W Y. Effect of differential speed rolling on microstructure and mechanical properties of an AZ91 magnesium alloy [J]. Journal of Alloys and Compounds, 2008, 460(1/2):289−293.

[16] LEE J B, KONNO T J, JEONG H G. Grain refinement and texture evolution in AZ31 Mg alloys sheet processed by differential speed rolling [J]. Materials Science and Engineering B, 2009, 161(1/3):166−169.

[17] HANG Guang-sheng, XU Wei, Huang Guang-jie, LI Hong-cheng, SONG Bo. Textural evolution of AZ31B magnesium alloy sheets undergoing repeated unidirectional bending at room temperature [J]. Material Science Technology, 2009, 25(3): 365−369.

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