汽车密封条纵向压缩粘贴性能

Vertical Compressive Sealing Performance of Automobile Sealing Strips

汽车的密封条粘贴质量对整车NVH的持续性质量稳定起重要的作用,密封条的内角粘贴与直线粘贴、外角粘贴相比更容易出现开胶的失效现象.为了提高密封条内角粘贴质量,研究了汽车密封条压缩粘贴工艺对粘贴基底产生的附加压力,提出了通过压缩率计算密封条对内圆角粘贴基底产生的压力的计算模型,并进行了该工艺过程的有限元仿真.结果表明:压缩粘贴可使密封条对粘贴基底施加稳定、均匀的附加压力.密封条通过压缩粘贴对粘贴基底施加的压力与压缩率呈线性比例关系,此压力沿截面宽度方向不等,其分布情况与密封条的截面形状相关,该压力值沿圆周方向均布,其差值小于8%.压缩粘贴可明显提升密封条内角粘贴质量,且具有稳定的工艺性.

The quality of sealing plays an important role in the sustainability of vehicle NVH. Sealing at inner corner is more prone to failure compared to the straight lines and outer corners. In order to improve the sealing quality at the inner corner, the additional pressure on the bonding substrate generated by compressive sealing strips was studied, and a model for calculating the pressure on the inner corner of the bonding substrate provided by compressive sealing strips was proposed and the finite element simulation of the process was carried out. The results showed that compressive sealing can provide additional pressure on the bonding substrate steadily and evenly.The pressure exerted on the bonding substrate by the sealing strip is proportional to the compression ratio. The distribution of pressure is related to the section shape along the width and it is not immutable. The pressure is distributed uniformly along the circumference, and the difference is less than 8%. It is proved that compressive sealing can obviously improve the sealing quality at the inner corner, and it has good process stability.