汽车空心稳定杆零件断裂失效分析及整改

Analysis and Rectification of Fracture Failure of Hollow Stabilizer Bar Parts in Automobile

通过激光共聚焦显微镜、扫描电镜等设备对某一量产车路试中发生的34MnB5空心稳定杆断裂问题进行失效分析,确认抛丸工艺时间不足及存在轴向原始裂纹是造成稳定杆发生早期疲劳失效断裂的原因,为进一步明确失效断裂的根本原因,针对稳定杆的制造工艺进行排查和原因分析,判断抛丸时间不足是导致稳定杆断裂的主要原因,由此判断该次断裂失效带来的后续影响,最后针对排查过程中已确认的风险点,识别整改方向并提出优化措施,进一步防止问题发生。

Failure analysis of the 34MnB5 hollow stabilizer bar fracture occurred in the road test of a mass production vehicle was carried out using laser confocal microscopy,scanning electron microscope and other equipment.It was confirmed that the insufficient shot blasting process time and the existence of axial original cracks caused early fatigue failure and fracture of the stabilizer bar.In order to further clarify the root cause of the failure and fracture,this article investigated and analyzed the manufacturing process of the stabilizer bar,determined that the main cause for the fracture of the stabilizer bar was insufficient shot blasting time,thus evaluated the subsequent impact of this fracture failure accident.Finally,the article identified the direction of rectification for the risk points during the investigation process,and proposed optimization measures to further prevent the occurrence of such problems.