低速碰撞工况下的铸铝保险杠轻量化设计

Lightweight Design of Cast Aluminum Bumper in the Low-speed Collision Condition

以某车型的保险杠为研究对象,运用铸造铝合金(ZL201A)作为轻量化材料,替代原保险杠零件的高强度钢材料,按精密熔模铸造工艺要求,对保险杠结构进行一体化设计.对原保险杠进行低速碰撞性能仿真,并以原保险杠低速碰撞性能为目标,对铸铝保险杠厚度进行试验设计,建立响应面模型进行优化.与原保险杠性能对比,在保证性能的前提下,且其质量相比原高强度钢保险杠下降了35%,轻量化效果显著.

In this paper, the bumper of a certain vehicle model is taken as the research object, and the ZL201 A is used as a lightweight material to replace the high-strength steel material of the original bumper parts. According to the requirements of the precision investment casting process, the integrated design of the bumper structure is carried out. The low-speed collision performance of the original bumper is simulated. With the target of the low-speed collision performance of the original bumper, the thickness of the cast aluminum bumper is experimentally designed, and the response surface model is established to optimize the original bumper. Under the premise of ensuring performance, its mass is reduced by 35% compared with the original high-strength steel bumper, and the weight reduction effect is remarkable.