ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Blank holder force (BHF) plays an important role in sheet metal forming. Previousstudies demonstrated that variable blank holder forces can improve the cold formability ofsteel blank, but the research on the application of variable blank holder force in warm formingof magnesium sheet forming has not been well investigated. In this study, the mechanicalproperty of AZ31 magnesium alloy sheet is measured through some uniaxial tensile tests. Inorder to obtain the variational rule of the BHF, a mathematical model of BHF is deducedbased 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 warmdeep drawing process of magnesium alloy sheet is also performed. A suitable variable blankholder force scheme is obtained through comparison among three results of simulation. Thesimulation indicates that the limiting drawing ratio of AZ31 magnesium alloy sheet can beimproved from 3.0 to 3.5 with the suitable blank holder force varied by an inverted V curve
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.340-341.639.pdf
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