某微型车B柱开裂分析解决

冲压减薄是汽车板件制造工艺中经常遇到的问题，尤其是在型面较复杂的零件中；车身部件在行驶过程中的疲劳开裂影响到车辆的安全、使用寿命等关键性能。该车前倒围外板B柱上端区城拉伸减薄直接导致了零件在没有达到设计使用寿命前疲劳开裂。经过更改型面过渡圆角、增加连接焊点等工艺改善，效果不很明显，最终采取措施，在开裂区域粘贴“热熔复合型阻尼胶片”，减弱零局部振动，提高板金强度，消除车辆使用过程中的疲劳开裂。

The Analysis and Solution to B-Pillar＇s Cracking in Some Mini Car

Sheet thinning percentage is usual problem while making vehicle metal plate part, especially making the intricate face part; body part fatigue crack directly affect the safety and the vehicle life. The front outer quarter of this vehicle has at- tenuation disfiguration at the B pillar lop, it induce the part crack at the thin area before the vehicle reach designed life. Changing the R value of the corner between two faces and increasing the weld point number, stick a piece of reinforce rubber on the thin area of the part can avoid the fatigue crack.