Corner Forming of AZ61A Magnesium Alloy Tube Within Warm Hydroforming

Abstract： Square-section hydroformed parts are commonly used on automobiles. The round corners are the crucial areas for these complex parts with various sections. In this paper, warm hydroforming experiments of AZ61A magnesium alloy tubes were carried out to study the regularity of small round corners forming without axial feeding. To determine the temperature impacts on corner forming, wall thinning and microstructure, reasonable constant section bulge ratio and target pressure were adopted. The minimum corner radii at each temperature, which are useful for production guideline making, were obtained. And the appropriate forming temperature range for AZ61A magnesium alloy was given in current condition.