Warm Deep Drawing Of AZ31 Magnesium Alloy Cups

Owing to the poor plasticity of magnesium alloy, it is difficult to deform at room temperature, which limit severely the application of magnesium alloy in structural fields. Recently, many scolars have studied the deformation and forming limit of magnesium alloy at elevated temperatures, the results show that the plasticity of magnesium alloy has a great increase with temperature elevated, but there has been little research on the influences of blank holding force, velocity of deep drawing and temperature on the forming limit of magnesium alloy. In this article, the process parameters above were studied.The uniaxial tensile test of AZ31 magnesium alloy was conducted, and the influence of temperature on the mechanical property was analyzed. The bulging test of AZ31 was also conducted to get the forming limit curves under different temperatures. The results show that, with temperature elevated, the plasticity of AZ31 magnesium alloy has a very great increase, and at elevated temperatures, with strain rate raised, the plasticity of AZ31 magnesium alloy decreases.Numerical simulation and experimental research on the warm deep drawing process of AZ31 magnesium alloy were carried out, and the influences of process parameters, such as blank holding force, velocity of deep drawing and temperature were investigated. The results show that, under the condition of forming temperature of 225℃and deep drawing velocity of 1mm/s, limiting drawing ratio 3.0 can be obtained.Combining the warm properties of AZ31 magnesium alloy with hydro-mechanical deep drawing, a method of warm hydro-mechanical deep drawing can be used to improve the LDR of AZ31 magnesium alloy. In this article, numerical simulation and experimental research on the warm hydro-mechanical deep drawing were carried out, and the effect of fluid pressure on deep drawing was analyzed. The results show that, simulation results agree with the experimental results.