Abstract
The warm drawing process from magnesium alloy sheet to notebook PC shell reveals specialities due to the low plasticity under low temperature of magnesium alloy. As Cockroft-Lathem ductile damage criteria has been introduced, the damage factors and their distribution were calculated by a series of simulations for the warm drawing process. Then the effect of a series of forming parameters on the maximum damage factor was analyzed and the crack regions were identified as the piece corners. Based on the objective of minimizing the damage factor a set of optimal parameters were achieved: temperature 250 °C, press speed 4mm/s, friction factor 0.09, concave die fillet radius 5.1mm, blank holder force 0.7 MPa, clearance between punch and die 1.15 mm.
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