Numerical Analysis of Formability in Deep Drawing of AZ31B Magnesium Alloy Sheets

摘要

Deep drawing process for producing a cylindrical cup from magnesium alloy material is investigated. It is the lightest practical material, which has been widely used as a basis for production of constructional components in automotive industry during the last decade. Numerical investigation of Mg alloy (AZ31B) sheet formability for Limit Drawing Ratio (LDR) obtained at temperature 200 °C is performed. The material strength constants, strain hardening exponents and friction coefficient, which have been experimentally obtained at 200 °C for different strain rates [3], are used in calculations. The influence of Blank Holding Pressure (BHP) on Punch Force (PF) for two strain rates is numerically investigated. The effect of strain rates, BHP and punch step upon LDR is also examined. The deep drawing process is simulated by using Finite Element Method (FEM) implemented in ANSYS code. The results are presented by "Punch Force (P) - Punch Stroke (S)" diagrams. On the basis of the obtained "P-S" diagrams conclusions about LDR formability at several BHP for considered strain rates are derived.