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Boss Forming Technology for Magnesium
Alloy Sheets
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| Mitsuhiko TAKA, Kaname FUJII, Masahiro TAKANO and Koji MIYOSHI |
In the production of magnesium alloy cases for portable equipment by press
forming, the formation of thick parts such as bosses on a sheet is an
important technical issue. In this study, a method of forming a boss on
a magnesium alloy sheet by warm forging was examined. First, the deformation
behavior of a magnesium alloy sheet by backward extrusion was analyzed
by FEM and through experiments, and a method of loading counter pressure
on the top of a boss was examined for preventing shrinkage of the rear
of the boss. Moreover, a test involving the formation of a case model
using a CNC free motion press machine that can perform heating and forming
consecutively within one stroke was carried out, and the influence of
various conditions on the practical forming of magnesium alloy cases was
evaluated.
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Keywords ■■■ |
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backward extrusion, magnesium alloy,
press machine, FEM, counter pressure |
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