间隙对铝合金帽型材绕弯回弹规律影响研究
Effects of the Clearance on the Springback of Cap-type Profile in Rotary Draw Bending Process of Aluminum Alloy

回弹是型材弯曲成形中不可避免的现象,模具与型材间间隙是影响回弹量的重要因素之一。为研究间隙对型材回弹半径和回弹角的影响,基于数值模拟软件ABAQUS建立了5052铝合金帽型材数控弯曲及卸载回弹的有限元模型,并实验验证了所建有限元模型的可靠性,分析了压块、防皱块、弯曲模及夹块与型材间间隙对回弹的影响。研究发现:减小弯曲模、夹块与型材间间隙回弹减小,减小压块与型材间间隙回弹增大,而防皱块与型材间间隙对回弹影响不明显。
Springback is an unavoidable phenomenon in the profile bending, clearance between the dies and profile is one of the significant factors affecting springback. To study the influence of clearance on springback of the profile, the 3D-FE models of rotary draw bending process and unloading springback of 5052 aluminum alloy cap-type profile were established based on ABAQUS, and their reliability were validated via experiments. Then, process simulation and analysis were carried out, and the influence laws of clearance between pressure die, wipe die, bend die, clamp die and profile on the springback were obtained, respectively. The results show that to reduce the clearance among bend die, clamp die and profile can make the springback weaken, the springback will more obvious following the clearance among pressure and profile decrease, while the clearance among wipe die and profile have an hardly effect on the springback of profile