Effect of process parameters on springback behaviour during air bending of aluminum alloy sheet AA6016

Abstract

Springback behavior is a major problem of sheet metal forming process. Especially aluminum alloy, which often encounter such problems often. At present, aluminum alloy is increasingly of used in the automotive industry for replace of the steels, due to its lightweight and good finished surface. This work aims study to springback behavior of cold rolled aluminum alloy (AA6016) during air-bending process by ISO7438/2010 test standard. To analyze the influence of bending process parameter are included: sheet thickness, punch radius, bending angle, die open, and the ratio of bending radius and material thickness (r/t), effecting to springback behavior. The results are clearly that, the springback angle is likely to increase with increase of the punch radius, size of die open and the ratio of punch radius and sheet thickness, and the springback tenor to decrease when the sheets thickness and bending angle increased. The increased bending angle will resulted to bending surface region is roughness increase and crack occurred to follow. As a result, the bending force and the springback angle decreased.