DEEP DRAWING FORMABILITY OF THE MEASUREMENT OF MAGNESIUM SHEET METALS

Abstract

In the field of sheet metals forming, the press forming is executed as important method for mass production processing. It is reported that the plastic formability of Mg-alloy improves in the warm working. The warm deep drawing tests was carried out by using the 2 kinds of punch diameter, 30 mm and 50 mm. This paper describes about the optimum deep drawing conditions with forming temperature and lubricant in the magnesium AZ31B alloy and the flame retardant magnesium alloy AMX602. These Mg alloys are difficult to mold at room temperature. However, in forming temperature at 180°C–200°C, Limiting Drawing Ratio (LDR) of AZ31B became 2.65. The optimum forming temperature condition of AZ31B is 180°C–200°C. The value of LDR decreases at 200°C or more. LDR of retardant magnesium alloy AMX602 is also 2.65 at the temperature at 300°C–320°C. The optimum temperature conditions of retardant magnesium alloy AMX602 is assumed to be 300°C or more. After molding, the thickness decreases from the punch shoulder to the part around the sidewall. The magnesium alloys in thickness change is similar to the common deep drawing with the other materials. In AZ31B alloy and AMX602 alloy, the failure pattern is often occurred at sidewall area and punch-shoulder area respectively.