中文摘要：

对某国产车型的后座椅骨架进行了镁合金替代设计,提出采用镁合金挤压型材和冲压板件结合的一件式结构,使座椅骨架的质量减轻41.3%,实现了轻量化的目标.利用有限元软件对原结构和新设计方案分别进行数值计算,保证新设计座椅骨架结构的模态、强度和刚度等性能指标均达到相关法规要求.

英文摘要：

A magnesium substitution design for an automotive seat back rest is carried out. With the magnesium extrusion profiles and the stamping panel integrated, the weight of the seat back rest is reduced by 41. 3% and the lightweight goal is achieved. Numerical calculations in comparison with the original structure and the substitution design are performed with finite element software, which ensures that the performance indicators such as the mode,the strength and the stiffness defined by related regulatory requirements are all realized.