兼顾轻量化与吸能性的汽车前纵梁拼焊板设计与参数优化

为减轻车身质量,减少冲压模具数量和降低制造成本,采用拼焊板对某小车的主要吸能部件前纵梁进行了改进设计,并对各块差厚钢板的材料等级及厚度进行了正交试验优化.为保证整车正面碰撞中前纵梁的吸能性,将该梁在整车有限元模型中进行替换,并按照法规及C-NCAP要求进行了正面碰撞分析.结果表明:替换后其碰撞吸能量上升2%左右,B柱的一侧加速度峰值平均下降3%以上,但该零件的质量却降低了6%左右.

Design and Parameter Optimization of Tailor-welded Blank for Car Front Longitudinal Rail Considering Energy Absorptionand Weight Lightening

In order to reduce the weight of the car body and the number and cost of stamping moulds,the tailor-welded blank technology is applied to the longitudinal rails of a car and the main energy-absorbing components in a front crash.Through the design of orthogonal experiment,the optimal material grade and thickness of each blank are determined.After replacing this component model with a new tailor-welded one in the verified whole car model,a frontal crash is simulated again according to the requirement of correlative vehicle crash legislation and C-NCAP.By comparison,the calculated results show that the weight of this component has decreased about 6% and the peak of acceleration at pole B decreased 2% on average but its energy-absorbing capability has increased 2% or so.