铝合金防碰撞吸能管液压成形加载路径研究

Research on hydraulic forming loading paths of aluminium alloy anti-collision energy-absorbing tube

针对防碰撞吸能管成形需要,提出了对铝合金6061圆管液压胀形过程的轴向进给补偿液压力加载路径控制过程。通过数值模拟方法,采用分析软件ABAQUS 6.10对铝合金6061管材液压胀形的加载路径进行了研究。以成形件不发生起皱、破裂两种失效方式以及最终成形壁厚分布为依据,分析了不同轴向进给和液压力加载路径对成形件质量的影响。研究表明,采用轴向进给量为27mm,液压力为85MPa的加载路径,获得吸能管的最大减薄率为20.5%,成形质量较好,并在一副模具中同时完成S型过渡区域的成形。

According to the need of the double diameter tube part forming,the axial feeding compensation and hydraulic pressure loading control to the hydraulic bulging process of aluminium alloy 6061 tube were put forward.By numerical simulation method and the analysis software ABAQUS 6.10,aluminum alloy 6061 tube hydraulic bulging loading paths were studied.Taking eventual thickness distribution of the forming parts and forming failure control as the basis,the axial feeding and liquid pressure loading path on forming quality was analyzed.Research shows that when the axle feeding rate is 27 mm and hydraulic pressure is 85 MPa,the max thinning rate of the anti-collision energy-absorbing tube is 20.5%,the quality of parts is nice and the forming of S shape transition region in a pair of mould can be finished.