Springback characteristics of AZ31 magnesium alloy as-extruded profile in warm tension-rotation bending process

The warm tension-rotation bending process of AZ31 magnesium alloy as-extruded profile with thin-walled and multi-rib was researched by numerical and experimental methods. The effects of process parameters on springback characteristics of AZ31 bent profile were investigated. The results indicate that when the forming temperature increases from 100 °C to 200 °C, the numerical and experimental springback angles of AZ31 bent profile all decrease, the experimental springback angle decreases from 11.6° to 10.7°, and the springback ratio reduces from 11.26% to 10.39%. The relationship between the forming temperature and the springback angle seems to be linear. When the bending angle increases from 100° to 110°, the numerical and experimental springback angles of AZ31 bent profile all increase, the experimental springback angle increases from 10.8° to 11.5°, and the springback ratio increases from 10.48% to 11.16%. When the pre-tension amount increases from 0.2% to 1.1%, the numerical and experimental springback angles of AZ31 bent profile all decrease, the experimental springback angle decreases from 12.5° to 9.8°, and the springback ratio decreases from 12.14% to 9.51%.