13-02-2013, 04:55 PM
sheet metal process super plastic forming
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ABSTRACT
The super plastic forming is a metal working process for forming sheet metal. The
superplastic forming process offers many advantages over conventional forming
operations including low forming pressure due to low flow stress, low die cost,
greater design flexibility and the ability to shape hard metals and form complex
shapes. However, low production rate due to slow forming process and limited
predictive capabilities due to lack of accurate constitutive models for superplastic
deformation are the main obstacles to the widespread use of SPF.
It works on the theory of super plasticity which means that the material can
elongate 100% of the original size. The essential criterion for the material to
exhibit superplasticity is finer grain size, less strain rate and at recrystallisation
temperature.
In this work, the superplastic behavior of AZ31B magnesium alloy into
hemispherical die is studied. The AZ31B magnesium alloy is the lightest alloy
when compared to Aluminium and mild steel and has a very good strength to
weight ratio. The drawback of the magnesium alloy in practical usage is limited
formability due to its Hexagonal closed pack crystal structure and highly
inflammable at certain elevated temperature.