Numerical Simulation of Hot Stamped 7075 Aluminum Alloy

摘要

Hot stamping of aluminum alloy is a new technology used in manufacturing aluminum alloy sheet. Hot stamping experiment of U-shape 7075 aluminum alloy component was conducted in this work. A thermal-mechanical coupled finite element analysis model was also established. The effects of binder force, initial temperature and forming speed on the thickness of a component were studied. Results showed that the component had a tendency to wrinkle as the binder force was lower than 10KN and there was no wrinkle with the binder force higher than 20KN. The minimum thickness of the component reduced dramatically with increasing binder force. As the initial forming temperature increased gradually, hardening exponent and the degree of uniform deformation decreased, resulting in local thinning and final decrease in thickness. The increase of forming speed caused the minimum thickness of the component to decrease and the temperature of the component after forming to increase. The thickness results of the finite element analysis were in good agreement with the experimental results. The validity of the established finite element model was verified and it could be used to guide the manufacture of aluminum alloy hot stamping.