Abstract: Against the development trend of replacing steel with plastic in automotive interiors, this paper investigates a new cross car beam structure made of steel-plastic hybrid materials. Through product design optimization, application of lightweight materials and simulation-driven optimization, the hybrid beam meets key performance requirements including steering column modal characteristics, dynamic stiffness at steering column mounting points and dynamic stiffness at air conditioning mounting points. Compared with conventional steel cross car beams, it reduces weight by 20%~30%, cuts the number of parts by 80% and shortens assembly time by 65%. The structure achieves significant improvements in weight reduction and assembly efficiency, demonstrating high engineering application value.

Key words: cross car beam; steel-plastic composite material; light weight; CAE simulation

摘要： 针对汽车内饰以塑代钢的发展趋势，文章研究了一种采用钢塑混合材料的新型仪表板 横梁结构。通过产品设计优化、轻质材料应用及仿真分析优化，该横梁可满足转向管柱模态、 管柱安装点动刚度、空调安装点动刚度等关键性能要求。相比传统钢制仪表板横梁，其质量 降低 20%～30%，零件数量减少 80%，装配工时缩短 65%，减重与装配效率提升效果显著， 具备较高工程应用价值。

关键词: 仪表板横梁；钢塑混合材料；轻量化；CAE 仿真