轿车密封条滚剪铝带断裂因素分析与改进设计

Fracture Analysis and Improvement Design of Lanced Aluminum Carrier for Car Sealing Strip

在密封条挤出试制过程中,出现了铝带断裂现象。为了分析影响铝带断裂的原因,利用MSC.Marc软件建立了铝带有限元分析模型,对铝带结构进行强度分析与结构优化设计。计算结果表明:铝带的最大应力为244.79 MPa,其位置在桥接根部尖角处;当最大应力大于拉伸强度时,铝带沿着尖角处断裂,这与铝带拉伸试验结果非常吻合。提出两种优化方案,优化结果表明:铝带改进结构能有效提高拉力。用口模试制验证了改进设计的有效性:使用改进结构铝带骨架挤出正常,没有再出现断裂现象。

In the process of extrusion trial-production of sealing strip,fracture of the carrier occurred.In order to analyze the factors affecting the fracture of the carrier,the finite element analysis model of the carrier was established by MSC.Marc software,and the strength analysis and structural optimization design of the carrier were carried out.The strength calculation shows that the maximum stress of the carrier is 244.79 MPa,which is located at the tip of the bridge root.When the maximum stress is greater than the tensile strength,the carrier breaks along the tip.This is in good agreement with the tensile test results of the carrier.According to the calculation and analysis,two optimization schemes were put forward.The results show that the improved structure of the carrier can effectively improve the tensile force.The trial-manufacture verification of the new die shows that the extrusion of the improved carrier is normal and no fracture occurs again.